class_linker.cc revision 22f8e5c82d12951be38cd893426e13bee33fd69d
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "handle_scope-inl.h" 65#include "thread.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 100 PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr), 189 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194// To set a value for generic JNI. May be necessary in compiler tests. 195extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 196 197void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 198 VLOG(startup) << "ClassLinker::Init"; 199 CHECK(Runtime::Current()->IsCompiler()); 200 201 CHECK(!init_done_); 202 203 // java_lang_Class comes first, it's needed for AllocClass 204 Thread* self = Thread::Current(); 205 gc::Heap* heap = Runtime::Current()->GetHeap(); 206 // The GC can't handle an object with a null class since we can't get the size of this object. 207 heap->IncrementDisableMovingGC(self); 208 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 209 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 210 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), 211 VoidFunctor())))); 212 CHECK(java_lang_Class.Get() != NULL); 213 mirror::Class::SetClassClass(java_lang_Class.Get()); 214 java_lang_Class->SetClass(java_lang_Class.Get()); 215 if (kUseBakerOrBrooksReadBarrier) { 216 java_lang_Class->AssertReadBarrierPointer(); 217 } 218 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 219 heap->DecrementDisableMovingGC(self); 220 // AllocClass(mirror::Class*) can now be used 221 222 // Class[] is used for reflection support. 223 Handle<mirror::Class> class_array_class( 224 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 225 class_array_class->SetComponentType(java_lang_Class.Get()); 226 227 // java_lang_Object comes next so that object_array_class can be created. 228 Handle<mirror::Class> java_lang_Object( 229 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 230 CHECK(java_lang_Object.Get() != NULL); 231 // backfill Object as the super class of Class. 232 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 233 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 234 235 // Object[] next to hold class roots. 236 Handle<mirror::Class> object_array_class( 237 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 238 object_array_class->SetComponentType(java_lang_Object.Get()); 239 240 // Setup the char class to be used for char[]. 241 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 242 sizeof(mirror::Class)))); 243 244 // Setup the char[] class to be used for String. 245 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 246 sizeof(mirror::Class)))); 247 char_array_class->SetComponentType(char_class.Get()); 248 mirror::CharArray::SetArrayClass(char_array_class.Get()); 249 250 // Setup String. 251 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 252 sizeof(mirror::StringClass)))); 253 mirror::String::SetClass(java_lang_String.Get()); 254 java_lang_String->SetObjectSize(sizeof(mirror::String)); 255 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 256 257 // Create storage for root classes, save away our work so far (requires descriptors). 258 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 259 kClassRootsMax); 260 CHECK(class_roots_ != NULL); 261 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 262 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 263 SetClassRoot(kClassArrayClass, class_array_class.Get()); 264 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 265 SetClassRoot(kCharArrayClass, char_array_class.Get()); 266 SetClassRoot(kJavaLangString, java_lang_String.Get()); 267 268 // Setup the primitive type classes. 269 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 270 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 271 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 272 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 273 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 274 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 275 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 276 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 277 278 // Create array interface entries to populate once we can load system classes. 279 array_iftable_ = AllocIfTable(self, 2); 280 281 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 282 Handle<mirror::Class> int_array_class( 283 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 284 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 285 mirror::IntArray::SetArrayClass(int_array_class.Get()); 286 SetClassRoot(kIntArrayClass, int_array_class.Get()); 287 288 // now that these are registered, we can use AllocClass() and AllocObjectArray 289 290 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 291 Handle<mirror::Class> java_lang_DexCache( 292 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 293 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 294 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 295 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 296 297 // Constructor, Field, Method, and AbstractMethod are necessary so 298 // that FindClass can link members. 299 Handle<mirror::Class> java_lang_reflect_ArtField( 300 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 301 CHECK(java_lang_reflect_ArtField.Get() != NULL); 302 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 303 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 304 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 305 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 306 307 Handle<mirror::Class> java_lang_reflect_ArtMethod( 308 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 309 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 310 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 311 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 312 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 313 314 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 315 316 // Set up array classes for string, field, method 317 Handle<mirror::Class> object_array_string( 318 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 319 object_array_string->SetComponentType(java_lang_String.Get()); 320 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 321 322 Handle<mirror::Class> object_array_art_method( 323 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 324 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 325 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 326 327 Handle<mirror::Class> object_array_art_field( 328 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 329 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 330 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 331 332 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 333 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 334 // these roots. 335 CHECK_NE(0U, boot_class_path.size()); 336 for (size_t i = 0; i != boot_class_path.size(); ++i) { 337 const DexFile* dex_file = boot_class_path[i]; 338 CHECK(dex_file != NULL); 339 AppendToBootClassPath(*dex_file); 340 } 341 342 // now we can use FindSystemClass 343 344 // run char class through InitializePrimitiveClass to finish init 345 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 346 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 347 348 // Create runtime resolution and imt conflict methods. Also setup the default imt. 349 Runtime* runtime = Runtime::Current(); 350 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 351 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 352 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 353 354 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 355 // we do not need friend classes or a publicly exposed setter. 356 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 357 358 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 359 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 360 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 361 CHECK_EQ(java_lang_Object.Get(), Object_class); 362 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 363 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 364 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 365 CHECK_EQ(java_lang_String.Get(), String_class); 366 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 367 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 368 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 369 CHECK_EQ(java_lang_String.Get(), String_class); 370 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 371 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 372 373 // Setup the primitive array type classes - can't be done until Object has a vtable. 374 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 375 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 376 377 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 378 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 379 380 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 381 CHECK_EQ(char_array_class.Get(), found_char_array_class); 382 383 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 384 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 385 386 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 387 CHECK_EQ(int_array_class.Get(), found_int_array_class); 388 389 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 390 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 391 392 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 393 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 394 395 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 396 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 397 398 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 399 CHECK_EQ(class_array_class.Get(), found_class_array_class); 400 401 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 402 CHECK_EQ(object_array_class.Get(), found_object_array_class); 403 404 // Setup the single, global copy of "iftable". 405 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 406 CHECK(java_lang_Cloneable != NULL); 407 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 408 CHECK(java_io_Serializable != NULL); 409 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 410 // crawl up and explicitly list all of the supers as well. 411 { 412 mirror::IfTable* array_iftable = 413 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 414 array_iftable->SetInterface(0, java_lang_Cloneable); 415 array_iftable->SetInterface(1, java_io_Serializable); 416 } 417 418 // Sanity check Class[] and Object[]'s interfaces. 419 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 420 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 421 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 422 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 423 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 424 // dex_cache_ fields and register them in class_table_. 425 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 426 CHECK_EQ(java_lang_Class.Get(), Class_class); 427 428 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 429 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 430 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 431 432 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 433 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 434 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 435 436 mirror::Class* String_array_class = 437 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 438 CHECK_EQ(object_array_string.Get(), String_array_class); 439 440 mirror::Class* Art_method_array_class = 441 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 442 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 443 444 mirror::Class* Art_field_array_class = 445 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 446 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 447 448 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 449 450 // Create java.lang.reflect.Proxy root. 451 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 452 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 453 454 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 455 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 456 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 457 mirror::Class* java_lang_ref_FinalizerReference = 458 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 459 java_lang_ref_FinalizerReference->SetAccessFlags( 460 java_lang_ref_FinalizerReference->GetAccessFlags() | 461 kAccClassIsReference | kAccClassIsFinalizerReference); 462 mirror::Class* java_lang_ref_PhantomReference = 463 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 464 java_lang_ref_PhantomReference->SetAccessFlags( 465 java_lang_ref_PhantomReference->GetAccessFlags() | 466 kAccClassIsReference | kAccClassIsPhantomReference); 467 mirror::Class* java_lang_ref_SoftReference = 468 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 469 java_lang_ref_SoftReference->SetAccessFlags( 470 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 471 mirror::Class* java_lang_ref_WeakReference = 472 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 473 java_lang_ref_WeakReference->SetAccessFlags( 474 java_lang_ref_WeakReference->GetAccessFlags() | 475 kAccClassIsReference | kAccClassIsWeakReference); 476 477 // Setup the ClassLoader, verifying the object_size_. 478 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 479 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 480 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 481 482 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 483 // java.lang.StackTraceElement as a convenience. 484 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 485 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 486 SetClassRoot(kJavaLangClassNotFoundException, 487 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 488 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 489 SetClassRoot(kJavaLangStackTraceElementArrayClass, 490 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 491 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 492 493 FinishInit(self); 494 495 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 496} 497 498void ClassLinker::FinishInit(Thread* self) { 499 VLOG(startup) << "ClassLinker::FinishInit entering"; 500 501 // Let the heap know some key offsets into java.lang.ref instances 502 // Note: we hard code the field indexes here rather than using FindInstanceField 503 // as the types of the field can't be resolved prior to the runtime being 504 // fully initialized 505 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 506 mirror::Class* java_lang_ref_FinalizerReference = 507 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 508 509 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 510 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 511 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 512 513 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 514 CHECK_STREQ(queue->GetName(), "queue"); 515 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 516 517 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 518 CHECK_STREQ(queueNext->GetName(), "queueNext"); 519 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 520 521 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 522 CHECK_STREQ(referent->GetName(), "referent"); 523 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 524 525 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 526 CHECK_STREQ(zombie->GetName(), "zombie"); 527 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 528 529 // ensure all class_roots_ are initialized 530 for (size_t i = 0; i < kClassRootsMax; i++) { 531 ClassRoot class_root = static_cast<ClassRoot>(i); 532 mirror::Class* klass = GetClassRoot(class_root); 533 CHECK(klass != NULL); 534 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 535 // note SetClassRoot does additional validation. 536 // if possible add new checks there to catch errors early 537 } 538 539 CHECK(array_iftable_ != NULL); 540 541 // disable the slow paths in FindClass and CreatePrimitiveClass now 542 // that Object, Class, and Object[] are setup 543 init_done_ = true; 544 545 VLOG(startup) << "ClassLinker::FinishInit exiting"; 546} 547 548void ClassLinker::RunRootClinits() { 549 Thread* self = Thread::Current(); 550 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 551 mirror::Class* c = GetClassRoot(ClassRoot(i)); 552 if (!c->IsArrayClass() && !c->IsPrimitive()) { 553 StackHandleScope<1> hs(self); 554 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 555 EnsureInitialized(h_class, true, true); 556 self->AssertNoPendingException(); 557 } 558 } 559} 560 561bool ClassLinker::GenerateOatFile(const char* dex_filename, 562 int oat_fd, 563 const char* oat_cache_filename, 564 std::string* error_msg) { 565 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 566 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 567 568 gc::Heap* heap = Runtime::Current()->GetHeap(); 569 std::string boot_image_option("--boot-image="); 570 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 571 572 std::string dex_file_option("--dex-file="); 573 dex_file_option += dex_filename; 574 575 std::string oat_fd_option("--oat-fd="); 576 StringAppendF(&oat_fd_option, "%d", oat_fd); 577 578 std::string oat_location_option("--oat-location="); 579 oat_location_option += oat_cache_filename; 580 581 std::vector<std::string> argv; 582 argv.push_back(dex2oat); 583 argv.push_back("--runtime-arg"); 584 argv.push_back("-classpath"); 585 argv.push_back("--runtime-arg"); 586 argv.push_back(Runtime::Current()->GetClassPathString()); 587 588 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 589 590 if (!Runtime::Current()->IsVerificationEnabled()) { 591 argv.push_back("--compiler-filter=verify-none"); 592 } 593 594 if (!kIsTargetBuild) { 595 argv.push_back("--host"); 596 } 597 598 argv.push_back(boot_image_option); 599 argv.push_back(dex_file_option); 600 argv.push_back(oat_fd_option); 601 argv.push_back(oat_location_option); 602 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 603 for (size_t i = 0; i < compiler_options.size(); ++i) { 604 argv.push_back(compiler_options[i].c_str()); 605 } 606 607 return Exec(argv, error_msg); 608} 609 610const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 611 WriterMutexLock mu(Thread::Current(), dex_lock_); 612 if (kIsDebugBuild) { 613 for (size_t i = 0; i < oat_files_.size(); ++i) { 614 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 615 } 616 } 617 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 618 oat_files_.push_back(oat_file); 619 return oat_file; 620} 621 622OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 623 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 624 OatFile* oat_file = space->ReleaseOatFile(); 625 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 626 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 627 return *oat_file; 628} 629 630const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 631 const char* dex_location = dex_file.GetLocation().c_str(); 632 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 633 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 634} 635 636const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 637 const uint32_t* const dex_location_checksum) { 638 ReaderMutexLock mu(Thread::Current(), dex_lock_); 639 for (size_t i = 0; i < oat_files_.size(); i++) { 640 const OatFile* oat_file = oat_files_[i]; 641 DCHECK(oat_file != NULL); 642 643 if (oat_location != nullptr) { 644 if (oat_file->GetLocation() != oat_location) { 645 continue; 646 } 647 } 648 649 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 650 dex_location_checksum, 651 false); 652 if (oat_dex_file != NULL) { 653 return oat_file; 654 } 655 } 656 return NULL; 657} 658 659static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 660 if (number == 0) { 661 return dex_location; 662 } else { 663 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 664 } 665} 666 667static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 668 bool generated, 669 std::vector<std::string>* error_msgs, 670 std::vector<const DexFile*>* dex_files) { 671 if (oat_file == nullptr) { 672 return false; 673 } 674 675 size_t old_size = dex_files->size(); // To rollback on error. 676 677 bool success = true; 678 for (size_t i = 0; success; ++i) { 679 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 680 const char* next_name = next_name_str.c_str(); 681 682 uint32_t dex_location_checksum; 683 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 684 std::string error_msg; 685 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 686 DCHECK_EQ(false, i == 0 && generated); 687 dex_location_checksum_pointer = nullptr; 688 } 689 690 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 691 692 if (oat_dex_file == nullptr) { 693 if (i == 0 && generated) { 694 std::string error_msg; 695 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 696 " file'%s'", dex_location, dex_location_checksum, 697 oat_file->GetLocation().c_str()); 698 error_msgs->push_back(error_msg); 699 } 700 break; // Not found, done. 701 } 702 703 // Checksum test. Test must succeed when generated. 704 success = !generated; 705 if (dex_location_checksum_pointer != nullptr) { 706 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 707 } 708 709 if (success) { 710 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 711 if (dex_file == nullptr) { 712 success = false; 713 error_msgs->push_back(error_msg); 714 } else { 715 dex_files->push_back(dex_file); 716 } 717 } 718 719 // When we generated the file, we expect success, or something is terribly wrong. 720 CHECK_EQ(false, generated && !success) 721 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 722 << std::hex << " dex_location_checksum=" << dex_location_checksum 723 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 724 } 725 726 if (dex_files->size() == old_size) { 727 success = false; // We did not even find classes.dex 728 } 729 730 if (success) { 731 return true; 732 } else { 733 // Free all the dex files we have loaded. 734 auto it = dex_files->begin() + old_size; 735 auto it_end = dex_files->end(); 736 for (; it != it_end; it++) { 737 delete *it; 738 } 739 dex_files->erase(dex_files->begin() + old_size, it_end); 740 741 return false; 742 } 743} 744 745// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 746// complicates the loading process, as we should not use an iterative loading process, because that 747// would register the oat file and dex files that come before the broken one. Instead, check all 748// multidex ahead of time. 749bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 750 std::vector<std::string>* error_msgs, 751 std::vector<const DexFile*>* dex_files) { 752 // 1) Check whether we have an open oat file. 753 // This requires a dex checksum, use the "primary" one. 754 uint32_t dex_location_checksum; 755 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 756 bool have_checksum = true; 757 std::string checksum_error_msg; 758 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 759 dex_location_checksum_pointer = nullptr; 760 have_checksum = false; 761 } 762 763 bool needs_registering = false; 764 765 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 766 dex_location_checksum_pointer)); 767 768 // 2) If we do not have an open one, maybe there's one on disk already. 769 770 // In case the oat file is not open, we play a locking game here so 771 // that if two different processes race to load and register or generate 772 // (or worse, one tries to open a partial generated file) we will be okay. 773 // This is actually common with apps that use DexClassLoader to work 774 // around the dex method reference limit and that have a background 775 // service running in a separate process. 776 ScopedFlock scoped_flock; 777 778 if (open_oat_file.get() == nullptr) { 779 if (oat_location != nullptr) { 780 // Can only do this if we have a checksum, else error. 781 if (!have_checksum) { 782 error_msgs->push_back(checksum_error_msg); 783 return false; 784 } 785 786 std::string error_msg; 787 788 // We are loading or creating one in the future. Time to set up the file lock. 789 if (!scoped_flock.Init(oat_location, &error_msg)) { 790 error_msgs->push_back(error_msg); 791 return false; 792 } 793 794 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 795 oat_location, &error_msg)); 796 797 if (open_oat_file.get() == nullptr) { 798 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 799 dex_location, oat_location, error_msg.c_str()); 800 VLOG(class_linker) << compound_msg; 801 error_msgs->push_back(compound_msg); 802 } 803 } else { 804 // TODO: What to lock here? 805 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 806 dex_location_checksum_pointer, 807 kRuntimeISA, error_msgs)); 808 } 809 needs_registering = true; 810 } 811 812 // 3) If we have an oat file, check all contained multidex files for our dex_location. 813 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 814 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 815 dex_files); 816 if (success) { 817 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 818 if (needs_registering) { 819 // We opened the oat file, so we must register it. 820 RegisterOatFile(oat_file); 821 } 822 return true; 823 } else { 824 if (needs_registering) { 825 // We opened it, delete it. 826 open_oat_file.reset(); 827 } else { 828 open_oat_file.release(); // Do not delete open oat files. 829 } 830 } 831 832 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 833 834 // Need a checksum, fail else. 835 if (!have_checksum) { 836 error_msgs->push_back(checksum_error_msg); 837 return false; 838 } 839 840 // Look in cache location if no oat_location is given. 841 std::string cache_location; 842 if (oat_location == nullptr) { 843 // Use the dalvik cache. 844 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 845 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 846 oat_location = cache_location.c_str(); 847 } 848 849 // Definitely need to lock now. 850 if (!scoped_flock.HasFile()) { 851 std::string error_msg; 852 if (!scoped_flock.Init(oat_location, &error_msg)) { 853 error_msgs->push_back(error_msg); 854 return false; 855 } 856 } 857 858 // Create the oat file. 859 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 860 oat_location, error_msgs)); 861 862 // Failed, bail. 863 if (open_oat_file.get() == nullptr) { 864 return false; 865 } 866 867 // Try to load again, but stronger checks. 868 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 869 dex_files); 870 if (success) { 871 RegisterOatFile(open_oat_file.release()); 872 return true; 873 } else { 874 return false; 875 } 876} 877 878const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 879 uint32_t dex_location_checksum, 880 const char* oat_location, 881 std::string* error_msg) { 882 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 883 !Runtime::Current()->IsCompiler(), 884 error_msg)); 885 if (oat_file.get() == nullptr) { 886 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 887 error_msg->c_str()); 888 return nullptr; 889 } 890 Runtime* runtime = Runtime::Current(); 891 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 892 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 893 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 894 if (expected_image_oat_checksum != actual_image_oat_checksum) { 895 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 896 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 897 actual_image_oat_checksum); 898 return nullptr; 899 } 900 901 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 902 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 903 if (expected_image_oat_offset != actual_image_oat_offset) { 904 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 905 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 906 actual_image_oat_offset); 907 return nullptr; 908 } 909 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 910 &dex_location_checksum); 911 if (oat_dex_file == nullptr) { 912 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 913 dex_location); 914 return nullptr; 915 } 916 uint32_t expected_dex_checksum = dex_location_checksum; 917 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 918 if (expected_dex_checksum != actual_dex_checksum) { 919 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 920 "found 0x%x", oat_location, expected_dex_checksum, 921 actual_dex_checksum); 922 return nullptr; 923 } 924 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 925 if (dex_file.get() != nullptr) { 926 return oat_file.release(); 927 } else { 928 return nullptr; 929 } 930} 931 932const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 933 int fd, const char* oat_location, 934 std::vector<std::string>* error_msgs) { 935 // Generate the output oat file for the dex file 936 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 937 std::string error_msg; 938 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 939 CHECK(!error_msg.empty()); 940 error_msgs->push_back(error_msg); 941 return nullptr; 942 } 943 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 944 !Runtime::Current()->IsCompiler(), 945 &error_msg)); 946 if (oat_file.get() == nullptr) { 947 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 948 oat_location, error_msg.c_str()); 949 error_msgs->push_back(compound_msg); 950 return nullptr; 951 } 952 953 return oat_file.release(); 954} 955 956bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 957 const char* dex_location, 958 uint32_t dex_location_checksum, 959 const InstructionSet instruction_set, 960 std::string* error_msg) { 961 Runtime* runtime = Runtime::Current(); 962 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 963 964 // If the requested instruction set is the same as the current runtime, 965 // we can use the checksums directly. If it isn't, we'll have to read the 966 // image header from the image for the right instruction set. 967 uint32_t image_oat_checksum = 0; 968 uintptr_t image_oat_data_begin = 0; 969 if (instruction_set == kRuntimeISA) { 970 const ImageHeader& image_header = image_space->GetImageHeader(); 971 image_oat_checksum = image_header.GetOatChecksum(); 972 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 973 } else { 974 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 975 image_space->GetImageLocation().c_str(), instruction_set)); 976 image_oat_checksum = image_header->GetOatChecksum(); 977 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 978 } 979 const OatHeader& oat_header = oat_file->GetOatHeader(); 980 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 981 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 982 983 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 984 &dex_location_checksum); 985 if (oat_dex_file == NULL) { 986 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 987 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 988 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 989 for (size_t i = 0; i < oat_dex_files.size(); i++) { 990 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 991 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 992 oat_file->GetLocation().c_str(), 993 oat_dex_file->GetDexFileLocation().c_str()); 994 } 995 return false; 996 } 997 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 998 999 if (image_check && dex_check) { 1000 return true; 1001 } 1002 1003 if (!image_check) { 1004 ScopedObjectAccess soa(Thread::Current()); 1005 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1006 oat_file->GetLocation().c_str(), 1007 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1008 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1009 image_oat_checksum, image_oat_data_begin); 1010 } 1011 if (!dex_check) { 1012 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1013 oat_file->GetLocation().c_str(), 1014 oat_dex_file->GetDexFileLocationChecksum(), 1015 dex_location, dex_location_checksum); 1016 } 1017 return false; 1018} 1019 1020const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1021 const char* dex_location, 1022 std::string* error_msg, 1023 bool* open_failed) { 1024 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1025 if (oat_file.get() == nullptr) { 1026 *open_failed = true; 1027 return nullptr; 1028 } 1029 *open_failed = false; 1030 std::unique_ptr<const DexFile> dex_file; 1031 uint32_t dex_location_checksum; 1032 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1033 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1034 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1035 // directory. 1036 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1037 if (oat_dex_file == nullptr) { 1038 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1039 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1040 error_msg->c_str()); 1041 return nullptr; 1042 } 1043 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1044 } else { 1045 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1046 kRuntimeISA, error_msg); 1047 if (!verified) { 1048 return nullptr; 1049 } 1050 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1051 &dex_location_checksum)->OpenDexFile(error_msg)); 1052 } 1053 1054 if (dex_file.get() != nullptr) { 1055 return oat_file.release(); 1056 } else { 1057 return nullptr; 1058 } 1059} 1060 1061const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1062 const char* dex_location, 1063 const uint32_t* const dex_location_checksum, 1064 InstructionSet isa, 1065 std::vector<std::string>* error_msgs) { 1066 // Look for an existing file next to dex. for example, for 1067 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1068 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1069 bool open_failed; 1070 std::string error_msg; 1071 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1072 &open_failed); 1073 if (oat_file != nullptr) { 1074 return oat_file; 1075 } 1076 if (dex_location_checksum == nullptr) { 1077 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1078 "%s: %s", odex_filename.c_str(), dex_location, 1079 error_msg.c_str())); 1080 return nullptr; 1081 } 1082 1083 std::string cache_error_msg; 1084 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1085 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1086 dalvik_cache.c_str())); 1087 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1088 &open_failed); 1089 if (oat_file != nullptr) { 1090 return oat_file; 1091 } 1092 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1093 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 1094 } 1095 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1096 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1097 cache_location.c_str(), cache_error_msg.c_str()); 1098 VLOG(class_linker) << compound_msg; 1099 error_msgs->push_back(compound_msg); 1100 1101 return nullptr; 1102} 1103 1104const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1105 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1106 for (size_t i = 0; i < oat_files_.size(); i++) { 1107 const OatFile* oat_file = oat_files_[i]; 1108 DCHECK(oat_file != nullptr); 1109 if (oat_file->GetLocation() == oat_location) { 1110 return oat_file; 1111 } 1112 } 1113 return nullptr; 1114} 1115 1116const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1117 std::string* error_msg) { 1118 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1119 if (oat_file != nullptr) { 1120 return oat_file; 1121 } 1122 1123 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1124 error_msg); 1125 if (oat_file == NULL) { 1126 return NULL; 1127 } 1128 return oat_file; 1129} 1130 1131static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1132 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1133 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1134 1135 DCHECK(obj != NULL); 1136 DCHECK(class_linker != NULL); 1137 1138 if (obj->IsArtMethod()) { 1139 mirror::ArtMethod* method = obj->AsArtMethod(); 1140 if (!method->IsNative()) { 1141 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1142 if (method != Runtime::Current()->GetResolutionMethod()) { 1143 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1144 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1145 } 1146 } 1147 } 1148} 1149 1150void ClassLinker::InitFromImage() { 1151 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1152 CHECK(!init_done_); 1153 1154 Thread* self = Thread::Current(); 1155 gc::Heap* heap = Runtime::Current()->GetHeap(); 1156 gc::space::ImageSpace* space = heap->GetImageSpace(); 1157 dex_cache_image_class_lookup_required_ = true; 1158 CHECK(space != NULL); 1159 OatFile& oat_file = GetImageOatFile(space); 1160 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1161 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1162 const char* image_file_location = oat_file.GetOatHeader(). 1163 GetStoreValueByKey(OatHeader::kImageLocationKey); 1164 CHECK(image_file_location == nullptr || *image_file_location == 0); 1165 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1166 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1167 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1168 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1169 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1170 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1171 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1172 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1173 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1174 1175 StackHandleScope<1> hs(self); 1176 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1177 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1178 AsObjectArray<mirror::Class>())); 1179 class_roots_ = class_roots.Get(); 1180 1181 // Special case of setting up the String class early so that we can test arbitrary objects 1182 // as being Strings or not 1183 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1184 1185 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1186 static_cast<uint32_t>(dex_caches->GetLength())); 1187 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1188 StackHandleScope<1> hs(self); 1189 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1190 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1191 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1192 nullptr); 1193 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1194 std::string error_msg; 1195 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1196 if (dex_file == NULL) { 1197 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1198 << " from within oat file " << oat_file.GetLocation() 1199 << " error '" << error_msg << "'"; 1200 } 1201 1202 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1203 1204 AppendToBootClassPath(*dex_file, dex_cache); 1205 } 1206 1207 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1208 // bitmap walk. 1209 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1210 1211 // Set entry point to interpreter if in InterpretOnly mode. 1212 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1213 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1214 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1215 } 1216 1217 // reinit class_roots_ 1218 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1219 class_roots_ = class_roots.Get(); 1220 1221 // reinit array_iftable_ from any array class instance, they should be == 1222 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1223 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1224 // String class root was set above 1225 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1226 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1227 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1228 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1229 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1230 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1231 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1232 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1233 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1234 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1235 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1236 1237 FinishInit(self); 1238 1239 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1240} 1241 1242void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1243 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1244 if ((flags & kVisitRootFlagAllRoots) != 0) { 1245 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1246 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1247 } 1248 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1249 for (auto& pair : new_class_roots_) { 1250 mirror::Object* old_ref = pair.second; 1251 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1252 if (UNLIKELY(pair.second != old_ref)) { 1253 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1254 // corresponding object. This is slow, but luckily for us, this may only happen with a 1255 // concurrent moving GC. 1256 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1257 it != end && it->first == pair.first; ++it) { 1258 // If the class stored matches the old class, update it to the new value. 1259 if (old_ref == it->second) { 1260 it->second = pair.second; 1261 } 1262 } 1263 } 1264 } 1265 } 1266 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1267 new_class_roots_.clear(); 1268 } 1269 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1270 log_new_class_table_roots_ = true; 1271 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1272 log_new_class_table_roots_ = false; 1273 } 1274 // We deliberately ignore the class roots in the image since we 1275 // handle image roots by using the MS/CMS rescanning of dirty cards. 1276} 1277 1278// Keep in sync with InitCallback. Anything we visit, we need to 1279// reinit references to when reinitializing a ClassLinker from a 1280// mapped image. 1281void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1282 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1283 Thread* self = Thread::Current(); 1284 { 1285 ReaderMutexLock mu(self, dex_lock_); 1286 if ((flags & kVisitRootFlagAllRoots) != 0) { 1287 for (mirror::DexCache*& dex_cache : dex_caches_) { 1288 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1289 } 1290 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1291 for (size_t index : new_dex_cache_roots_) { 1292 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1293 } 1294 } 1295 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1296 new_dex_cache_roots_.clear(); 1297 } 1298 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1299 log_new_dex_caches_roots_ = true; 1300 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1301 log_new_dex_caches_roots_ = false; 1302 } 1303 } 1304 VisitClassRoots(callback, arg, flags); 1305 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1306 DCHECK(array_iftable_ != nullptr); 1307 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1308 if (find_array_class_cache_[i] != nullptr) { 1309 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1310 kRootVMInternal); 1311 } 1312 } 1313} 1314 1315void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1316 if (dex_cache_image_class_lookup_required_) { 1317 MoveImageClassesToClassTable(); 1318 } 1319 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1320 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1321 mirror::Class** root = &it.second; 1322 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1323 if (!visitor(c, arg)) { 1324 return; 1325 } 1326 } 1327} 1328 1329static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1330 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1331 classes->insert(c); 1332 return true; 1333} 1334 1335void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1336 std::set<mirror::Class*> classes; 1337 VisitClasses(GetClassesVisitor, &classes); 1338 for (mirror::Class* klass : classes) { 1339 if (!visitor(klass, arg)) { 1340 return; 1341 } 1342 } 1343} 1344 1345ClassLinker::~ClassLinker() { 1346 mirror::Class::ResetClass(); 1347 mirror::String::ResetClass(); 1348 mirror::ArtField::ResetClass(); 1349 mirror::ArtMethod::ResetClass(); 1350 mirror::BooleanArray::ResetArrayClass(); 1351 mirror::ByteArray::ResetArrayClass(); 1352 mirror::CharArray::ResetArrayClass(); 1353 mirror::DoubleArray::ResetArrayClass(); 1354 mirror::FloatArray::ResetArrayClass(); 1355 mirror::IntArray::ResetArrayClass(); 1356 mirror::LongArray::ResetArrayClass(); 1357 mirror::ShortArray::ResetArrayClass(); 1358 mirror::Throwable::ResetClass(); 1359 mirror::StackTraceElement::ResetClass(); 1360 STLDeleteElements(&boot_class_path_); 1361 STLDeleteElements(&oat_files_); 1362} 1363 1364mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1365 gc::Heap* heap = Runtime::Current()->GetHeap(); 1366 StackHandleScope<16> hs(self); 1367 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1368 Handle<mirror::DexCache> dex_cache( 1369 hs.NewHandle(down_cast<mirror::DexCache*>( 1370 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1371 VoidFunctor())))); 1372 if (dex_cache.Get() == NULL) { 1373 return NULL; 1374 } 1375 Handle<mirror::String> 1376 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1377 if (location.Get() == NULL) { 1378 return NULL; 1379 } 1380 Handle<mirror::ObjectArray<mirror::String>> 1381 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1382 if (strings.Get() == NULL) { 1383 return NULL; 1384 } 1385 Handle<mirror::ObjectArray<mirror::Class>> 1386 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1387 if (types.Get() == NULL) { 1388 return NULL; 1389 } 1390 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1391 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1392 if (methods.Get() == NULL) { 1393 return NULL; 1394 } 1395 Handle<mirror::ObjectArray<mirror::ArtField>> 1396 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1397 if (fields.Get() == NULL) { 1398 return NULL; 1399 } 1400 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1401 fields.Get()); 1402 return dex_cache.Get(); 1403} 1404 1405// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1406// fence. 1407class InitializeClassVisitor { 1408 public: 1409 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1410 } 1411 1412 void operator()(mirror::Object* obj, size_t usable_size) const 1413 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1414 DCHECK_LE(class_size_, usable_size); 1415 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1416 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1417 // DCHECK(klass->IsClass()); 1418 klass->SetClassSize(class_size_); 1419 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1420 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1421 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1422 } 1423 1424 private: 1425 const uint32_t class_size_; 1426 1427 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1428}; 1429 1430mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1431 uint32_t class_size) { 1432 DCHECK_GE(class_size, sizeof(mirror::Class)); 1433 gc::Heap* heap = Runtime::Current()->GetHeap(); 1434 InitializeClassVisitor visitor(class_size); 1435 mirror::Object* k = kMovingClasses ? 1436 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1437 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1438 if (UNLIKELY(k == nullptr)) { 1439 CHECK(self->IsExceptionPending()); // OOME. 1440 return nullptr; 1441 } 1442 return k->AsClass(); 1443} 1444 1445mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1446 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1447} 1448 1449mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1450 return down_cast<mirror::ArtField*>( 1451 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1452} 1453 1454mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1455 return down_cast<mirror::ArtMethod*>( 1456 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1457} 1458 1459mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1460 Thread* self, size_t length) { 1461 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1462 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1463} 1464 1465static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1466 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1467 DCHECK(klass != NULL); 1468 // Wait for the class if it has not already been linked. 1469 if (!klass->IsResolved() && !klass->IsErroneous()) { 1470 StackHandleScope<1> hs(self); 1471 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1472 ObjectLock<mirror::Class> lock(self, h_class); 1473 // Check for circular dependencies between classes. 1474 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1475 ThrowClassCircularityError(h_class.Get()); 1476 h_class->SetStatus(mirror::Class::kStatusError, self); 1477 return nullptr; 1478 } 1479 // Wait for the pending initialization to complete. 1480 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1481 lock.WaitIgnoringInterrupts(); 1482 } 1483 } 1484 if (klass->IsErroneous()) { 1485 ThrowEarlierClassFailure(klass); 1486 return nullptr; 1487 } 1488 // Return the loaded class. No exceptions should be pending. 1489 CHECK(klass->IsResolved()) << PrettyClass(klass); 1490 self->AssertNoPendingException(); 1491 return klass; 1492} 1493 1494mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1495 Handle<mirror::ClassLoader> class_loader) { 1496 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1497 DCHECK(self != nullptr); 1498 self->AssertNoPendingException(); 1499 if (descriptor[1] == '\0') { 1500 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1501 // for primitive classes that aren't backed by dex files. 1502 return FindPrimitiveClass(descriptor[0]); 1503 } 1504 // Find the class in the loaded classes table. 1505 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1506 if (klass != NULL) { 1507 return EnsureResolved(self, klass); 1508 } 1509 // Class is not yet loaded. 1510 if (descriptor[0] == '[') { 1511 return CreateArrayClass(self, descriptor, class_loader); 1512 } else if (class_loader.Get() == nullptr) { 1513 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1514 if (pair.second != NULL) { 1515 StackHandleScope<1> hs(self); 1516 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1517 } 1518 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1519 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1520 // throw of a NoClassDefFoundError. 1521 if (IsInBootClassPath(descriptor)) { 1522 mirror::Class* system_class = FindSystemClass(self, descriptor); 1523 CHECK(system_class != NULL); 1524 return system_class; 1525 } 1526 // Next try the compile time class path. 1527 const std::vector<const DexFile*>* class_path; 1528 { 1529 ScopedObjectAccessUnchecked soa(self); 1530 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1531 soa.AddLocalReference<jobject>(class_loader.Get())); 1532 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1533 } 1534 1535 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1536 if (pair.second != NULL) { 1537 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1538 } 1539 1540 } else { 1541 ScopedObjectAccessUnchecked soa(self); 1542 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1543 soa.AddLocalReference<jobject>(class_loader.Get())); 1544 std::string class_name_string(DescriptorToDot(descriptor)); 1545 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1546 { 1547 ScopedThreadStateChange tsc(self, kNative); 1548 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1549 soa.Env()->NewStringUTF(class_name_string.c_str())); 1550 if (class_name_object.get() == NULL) { 1551 return NULL; 1552 } 1553 CHECK(class_loader_object.get() != NULL); 1554 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1555 WellKnownClasses::java_lang_ClassLoader_loadClass, 1556 class_name_object.get())); 1557 } 1558 if (self->IsExceptionPending()) { 1559 // If the ClassLoader threw, pass that exception up. 1560 return NULL; 1561 } else if (result.get() == NULL) { 1562 // broken loader - throw NPE to be compatible with Dalvik 1563 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1564 class_name_string.c_str()).c_str()); 1565 return NULL; 1566 } else { 1567 // success, return mirror::Class* 1568 return soa.Decode<mirror::Class*>(result.get()); 1569 } 1570 } 1571 1572 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1573 return NULL; 1574} 1575 1576mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1577 Handle<mirror::ClassLoader> class_loader, 1578 const DexFile& dex_file, 1579 const DexFile::ClassDef& dex_class_def) { 1580 Thread* self = Thread::Current(); 1581 StackHandleScope<2> hs(self); 1582 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1583 // Load the class from the dex file. 1584 if (UNLIKELY(!init_done_)) { 1585 // finish up init of hand crafted class_roots_ 1586 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1587 klass.Assign(GetClassRoot(kJavaLangObject)); 1588 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1589 klass.Assign(GetClassRoot(kJavaLangClass)); 1590 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1591 klass.Assign(GetClassRoot(kJavaLangString)); 1592 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1593 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1594 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1595 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1596 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1597 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1598 } else { 1599 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1600 } 1601 } else { 1602 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1603 } 1604 if (UNLIKELY(klass.Get() == NULL)) { 1605 CHECK(self->IsExceptionPending()); // Expect an OOME. 1606 return NULL; 1607 } 1608 klass->SetDexCache(FindDexCache(dex_file)); 1609 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1610 // Check for a pending exception during load 1611 if (self->IsExceptionPending()) { 1612 klass->SetStatus(mirror::Class::kStatusError, self); 1613 return NULL; 1614 } 1615 ObjectLock<mirror::Class> lock(self, klass); 1616 klass->SetClinitThreadId(self->GetTid()); 1617 // Add the newly loaded class to the loaded classes table. 1618 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1619 if (existing != NULL) { 1620 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1621 // this thread to block. 1622 return EnsureResolved(self, existing); 1623 } 1624 // Finish loading (if necessary) by finding parents 1625 CHECK(!klass->IsLoaded()); 1626 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1627 // Loading failed. 1628 klass->SetStatus(mirror::Class::kStatusError, self); 1629 return NULL; 1630 } 1631 CHECK(klass->IsLoaded()); 1632 // Link the class (if necessary) 1633 CHECK(!klass->IsResolved()); 1634 // TODO: Use fast jobjects? 1635 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1636 if (!LinkClass(self, klass, interfaces)) { 1637 // Linking failed. 1638 klass->SetStatus(mirror::Class::kStatusError, self); 1639 return NULL; 1640 } 1641 CHECK(klass->IsResolved()); 1642 1643 /* 1644 * We send CLASS_PREPARE events to the debugger from here. The 1645 * definition of "preparation" is creating the static fields for a 1646 * class and initializing them to the standard default values, but not 1647 * executing any code (that comes later, during "initialization"). 1648 * 1649 * We did the static preparation in LinkClass. 1650 * 1651 * The class has been prepared and resolved but possibly not yet verified 1652 * at this point. 1653 */ 1654 Dbg::PostClassPrepare(klass.Get()); 1655 1656 return klass.Get(); 1657} 1658 1659// Precomputes size that will be needed for Class, matching LinkStaticFields 1660uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1661 const DexFile::ClassDef& dex_class_def) { 1662 const byte* class_data = dex_file.GetClassData(dex_class_def); 1663 size_t num_ref = 0; 1664 size_t num_32 = 0; 1665 size_t num_64 = 0; 1666 if (class_data != NULL) { 1667 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1668 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1669 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1670 char c = descriptor[0]; 1671 if (c == 'L' || c == '[') { 1672 num_ref++; 1673 } else if (c == 'J' || c == 'D') { 1674 num_64++; 1675 } else { 1676 num_32++; 1677 } 1678 } 1679 } 1680 // start with generic class data 1681 uint32_t size = sizeof(mirror::Class); 1682 // follow with reference fields which must be contiguous at start 1683 size += (num_ref * sizeof(uint32_t)); 1684 // if there are 64-bit fields to add, make sure they are aligned 1685 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1686 if (num_32 != 0) { 1687 // use an available 32-bit field for padding 1688 num_32--; 1689 } 1690 size += sizeof(uint32_t); // either way, we are adding a word 1691 DCHECK_EQ(size, RoundUp(size, 8)); 1692 } 1693 // tack on any 64-bit fields now that alignment is assured 1694 size += (num_64 * sizeof(uint64_t)); 1695 // tack on any remaining 32-bit fields 1696 size += (num_32 * sizeof(uint32_t)); 1697 return size; 1698} 1699 1700OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1701 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1702 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1703 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1704 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1705 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1706 &dex_location_checksum); 1707 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1708 return oat_dex_file->GetOatClass(class_def_idx); 1709} 1710 1711static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1712 uint32_t method_idx) { 1713 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1714 const byte* class_data = dex_file.GetClassData(class_def); 1715 CHECK(class_data != NULL); 1716 ClassDataItemIterator it(dex_file, class_data); 1717 // Skip fields 1718 while (it.HasNextStaticField()) { 1719 it.Next(); 1720 } 1721 while (it.HasNextInstanceField()) { 1722 it.Next(); 1723 } 1724 // Process methods 1725 size_t class_def_method_index = 0; 1726 while (it.HasNextDirectMethod()) { 1727 if (it.GetMemberIndex() == method_idx) { 1728 return class_def_method_index; 1729 } 1730 class_def_method_index++; 1731 it.Next(); 1732 } 1733 while (it.HasNextVirtualMethod()) { 1734 if (it.GetMemberIndex() == method_idx) { 1735 return class_def_method_index; 1736 } 1737 class_def_method_index++; 1738 it.Next(); 1739 } 1740 DCHECK(!it.HasNext()); 1741 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1742 return 0; 1743} 1744 1745const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1746 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1747 // method for direct methods (or virtual methods made direct). 1748 mirror::Class* declaring_class = method->GetDeclaringClass(); 1749 size_t oat_method_index; 1750 if (method->IsStatic() || method->IsDirect()) { 1751 // Simple case where the oat method index was stashed at load time. 1752 oat_method_index = method->GetMethodIndex(); 1753 } else { 1754 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1755 // by search for its position in the declared virtual methods. 1756 oat_method_index = declaring_class->NumDirectMethods(); 1757 size_t end = declaring_class->NumVirtualMethods(); 1758 bool found = false; 1759 for (size_t i = 0; i < end; i++) { 1760 if (declaring_class->GetVirtualMethod(i) == method) { 1761 found = true; 1762 break; 1763 } 1764 oat_method_index++; 1765 } 1766 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1767 } 1768 DCHECK_EQ(oat_method_index, 1769 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1770 method->GetDeclaringClass()->GetDexClassDefIndex(), 1771 method->GetDexMethodIndex())); 1772 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1773 declaring_class->GetDexClassDefIndex()); 1774 1775 return oat_class.GetOatMethod(oat_method_index); 1776} 1777 1778// Special case to get oat code without overwriting a trampoline. 1779const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1780 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1781 if (method->IsProxyMethod()) { 1782 return GetQuickProxyInvokeHandler(); 1783 } 1784 const void* result = GetOatMethodFor(method).GetQuickCode(); 1785 if (result == nullptr) { 1786 if (method->IsNative()) { 1787 // No code and native? Use generic trampoline. 1788 result = GetQuickGenericJniTrampoline(); 1789 } else if (method->IsPortableCompiled()) { 1790 // No code? Do we expect portable code? 1791 result = GetQuickToPortableBridge(); 1792 } else { 1793 // No code? You must mean to go into the interpreter. 1794 result = GetQuickToInterpreterBridge(); 1795 } 1796 } 1797 return result; 1798} 1799 1800const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1801 bool* have_portable_code) { 1802 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1803 *have_portable_code = false; 1804 if (method->IsProxyMethod()) { 1805 return GetPortableProxyInvokeHandler(); 1806 } 1807 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1808 const void* result = oat_method.GetPortableCode(); 1809 if (result == nullptr) { 1810 if (oat_method.GetQuickCode() == nullptr) { 1811 // No code? You must mean to go into the interpreter. 1812 result = GetPortableToInterpreterBridge(); 1813 } else { 1814 // No code? But there's quick code, so use a bridge. 1815 result = GetPortableToQuickBridge(); 1816 } 1817 } else { 1818 *have_portable_code = true; 1819 } 1820 return result; 1821} 1822 1823const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1824 uint32_t method_idx) { 1825 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1826 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1827 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1828} 1829 1830const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1831 uint32_t method_idx) { 1832 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1833 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1834 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1835} 1836 1837// Returns true if the method must run with interpreter, false otherwise. 1838static bool NeedsInterpreter( 1839 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1840 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1841 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1842 // No code: need interpreter. 1843 // May return true for native code, in the case of generic JNI 1844 // DCHECK(!method->IsNative()); 1845 return true; 1846 } 1847#ifdef ART_SEA_IR_MODE 1848 ScopedObjectAccess soa(Thread::Current()); 1849 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1850 LOG(INFO) << "Found " << PrettyMethod(method); 1851 return false; 1852 } 1853#endif 1854 // If interpreter mode is enabled, every method (except native and proxy) must 1855 // be run with interpreter. 1856 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1857 !method->IsNative() && !method->IsProxyMethod(); 1858} 1859 1860void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1861 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1862 if (klass->NumDirectMethods() == 0) { 1863 return; // No direct methods => no static methods. 1864 } 1865 Runtime* runtime = Runtime::Current(); 1866 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1867 return; // OAT file unavailable. 1868 } 1869 const DexFile& dex_file = klass->GetDexFile(); 1870 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1871 CHECK(dex_class_def != nullptr); 1872 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1873 // There should always be class data if there were direct methods. 1874 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1875 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1876 ClassDataItemIterator it(dex_file, class_data); 1877 // Skip fields 1878 while (it.HasNextStaticField()) { 1879 it.Next(); 1880 } 1881 while (it.HasNextInstanceField()) { 1882 it.Next(); 1883 } 1884 // Link the code of methods skipped by LinkCode. 1885 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1886 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1887 if (!method->IsStatic()) { 1888 // Only update static methods. 1889 continue; 1890 } 1891 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1892 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1893 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1894 bool have_portable_code = false; 1895 if (enter_interpreter) { 1896 // Use interpreter entry point. 1897 // Check whether the method is native, in which case it's generic JNI. 1898 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1899 quick_code = GetQuickGenericJniTrampoline(); 1900 portable_code = GetPortableToQuickBridge(); 1901 } else { 1902 portable_code = GetPortableToInterpreterBridge(); 1903 quick_code = GetQuickToInterpreterBridge(); 1904 } 1905 } else { 1906 if (portable_code == nullptr) { 1907 portable_code = GetPortableToQuickBridge(); 1908 } else { 1909 have_portable_code = true; 1910 } 1911 if (quick_code == nullptr) { 1912 quick_code = GetQuickToPortableBridge(); 1913 } 1914 } 1915 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1916 have_portable_code); 1917 } 1918 // Ignore virtual methods on the iterator. 1919} 1920 1921void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1922 const DexFile& dex_file, uint32_t dex_method_index, 1923 uint32_t method_index) { 1924 // Method shouldn't have already been linked. 1925 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1926 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1927 // Every kind of method should at least get an invoke stub from the oat_method. 1928 // non-abstract methods also get their code pointers. 1929 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1930 oat_method.LinkMethod(method.Get()); 1931 1932 // Install entry point from interpreter. 1933 Runtime* runtime = Runtime::Current(); 1934 bool enter_interpreter = NeedsInterpreter(method.Get(), 1935 method->GetEntryPointFromQuickCompiledCode(), 1936 method->GetEntryPointFromPortableCompiledCode()); 1937 if (enter_interpreter && !method->IsNative()) { 1938 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1939 } else { 1940 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1941 } 1942 1943 if (method->IsAbstract()) { 1944 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1945 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1946 return; 1947 } 1948 1949 bool have_portable_code = false; 1950 if (method->IsStatic() && !method->IsConstructor()) { 1951 // For static methods excluding the class initializer, install the trampoline. 1952 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1953 // after initializing class (see ClassLinker::InitializeClass method). 1954 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1955 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1956 } else if (enter_interpreter) { 1957 if (!method->IsNative()) { 1958 // Set entry point from compiled code if there's no code or in interpreter only mode. 1959 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1960 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1961 } else { 1962 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1963 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1964 } 1965 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1966 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1967 have_portable_code = true; 1968 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1969 } else { 1970 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1971 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1972 } 1973 1974 if (method->IsNative()) { 1975 // Unregistering restores the dlsym lookup stub. 1976 method->UnregisterNative(Thread::Current()); 1977 1978 if (enter_interpreter) { 1979 // We have a native method here without code. Then it should have either the GenericJni 1980 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1981 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1982 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1983 } 1984 } 1985 1986 // Allow instrumentation its chance to hijack code. 1987 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1988 method->GetEntryPointFromQuickCompiledCode(), 1989 method->GetEntryPointFromPortableCompiledCode(), 1990 have_portable_code); 1991} 1992 1993void ClassLinker::LoadClass(const DexFile& dex_file, 1994 const DexFile::ClassDef& dex_class_def, 1995 Handle<mirror::Class> klass, 1996 mirror::ClassLoader* class_loader) { 1997 CHECK(klass.Get() != NULL); 1998 CHECK(klass->GetDexCache() != NULL); 1999 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2000 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2001 CHECK(descriptor != NULL); 2002 2003 klass->SetClass(GetClassRoot(kJavaLangClass)); 2004 if (kUseBakerOrBrooksReadBarrier) { 2005 klass->AssertReadBarrierPointer(); 2006 } 2007 uint32_t access_flags = dex_class_def.access_flags_; 2008 // Make sure that none of our runtime-only flags are set. 2009 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2010 klass->SetAccessFlags(access_flags); 2011 klass->SetClassLoader(class_loader); 2012 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2013 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2014 2015 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2016 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2017 2018 const byte* class_data = dex_file.GetClassData(dex_class_def); 2019 if (class_data == NULL) { 2020 return; // no fields or methods - for example a marker interface 2021 } 2022 2023 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2024 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2025 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2026 } else { 2027 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2028 } 2029} 2030 2031void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2032 const byte* class_data, 2033 Handle<mirror::Class> klass, 2034 mirror::ClassLoader* class_loader, 2035 const OatFile::OatClass* oat_class) { 2036 // Load fields. 2037 ClassDataItemIterator it(dex_file, class_data); 2038 Thread* self = Thread::Current(); 2039 if (it.NumStaticFields() != 0) { 2040 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2041 if (UNLIKELY(statics == NULL)) { 2042 CHECK(self->IsExceptionPending()); // OOME. 2043 return; 2044 } 2045 klass->SetSFields(statics); 2046 } 2047 if (it.NumInstanceFields() != 0) { 2048 mirror::ObjectArray<mirror::ArtField>* fields = 2049 AllocArtFieldArray(self, it.NumInstanceFields()); 2050 if (UNLIKELY(fields == NULL)) { 2051 CHECK(self->IsExceptionPending()); // OOME. 2052 return; 2053 } 2054 klass->SetIFields(fields); 2055 } 2056 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2057 StackHandleScope<1> hs(self); 2058 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2059 if (UNLIKELY(sfield.Get() == NULL)) { 2060 CHECK(self->IsExceptionPending()); // OOME. 2061 return; 2062 } 2063 klass->SetStaticField(i, sfield.Get()); 2064 LoadField(dex_file, it, klass, sfield); 2065 } 2066 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2067 StackHandleScope<1> hs(self); 2068 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2069 if (UNLIKELY(ifield.Get() == NULL)) { 2070 CHECK(self->IsExceptionPending()); // OOME. 2071 return; 2072 } 2073 klass->SetInstanceField(i, ifield.Get()); 2074 LoadField(dex_file, it, klass, ifield); 2075 } 2076 2077 // Load methods. 2078 if (it.NumDirectMethods() != 0) { 2079 // TODO: append direct methods to class object 2080 mirror::ObjectArray<mirror::ArtMethod>* directs = 2081 AllocArtMethodArray(self, it.NumDirectMethods()); 2082 if (UNLIKELY(directs == NULL)) { 2083 CHECK(self->IsExceptionPending()); // OOME. 2084 return; 2085 } 2086 klass->SetDirectMethods(directs); 2087 } 2088 if (it.NumVirtualMethods() != 0) { 2089 // TODO: append direct methods to class object 2090 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2091 AllocArtMethodArray(self, it.NumVirtualMethods()); 2092 if (UNLIKELY(virtuals == NULL)) { 2093 CHECK(self->IsExceptionPending()); // OOME. 2094 return; 2095 } 2096 klass->SetVirtualMethods(virtuals); 2097 } 2098 size_t class_def_method_index = 0; 2099 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2100 StackHandleScope<1> hs(self); 2101 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2102 if (UNLIKELY(method.Get() == NULL)) { 2103 CHECK(self->IsExceptionPending()); // OOME. 2104 return; 2105 } 2106 klass->SetDirectMethod(i, method.Get()); 2107 if (oat_class != nullptr) { 2108 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2109 } 2110 method->SetMethodIndex(class_def_method_index); 2111 class_def_method_index++; 2112 } 2113 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2114 StackHandleScope<1> hs(self); 2115 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2116 if (UNLIKELY(method.Get() == NULL)) { 2117 CHECK(self->IsExceptionPending()); // OOME. 2118 return; 2119 } 2120 klass->SetVirtualMethod(i, method.Get()); 2121 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2122 if (oat_class != nullptr) { 2123 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2124 } 2125 class_def_method_index++; 2126 } 2127 DCHECK(!it.HasNext()); 2128} 2129 2130void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2131 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2132 uint32_t field_idx = it.GetMemberIndex(); 2133 dst->SetDexFieldIndex(field_idx); 2134 dst->SetDeclaringClass(klass.Get()); 2135 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2136} 2137 2138mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2139 const ClassDataItemIterator& it, 2140 Handle<mirror::Class> klass) { 2141 uint32_t dex_method_idx = it.GetMemberIndex(); 2142 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2143 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2144 2145 mirror::ArtMethod* dst = AllocArtMethod(self); 2146 if (UNLIKELY(dst == NULL)) { 2147 CHECK(self->IsExceptionPending()); // OOME. 2148 return NULL; 2149 } 2150 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2151 2152 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2153 dst->SetDexMethodIndex(dex_method_idx); 2154 dst->SetDeclaringClass(klass.Get()); 2155 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2156 2157 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2158 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2159 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2160 2161 uint32_t access_flags = it.GetMemberAccessFlags(); 2162 2163 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2164 // Set finalizable flag on declaring class. 2165 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2166 // Void return type. 2167 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2168 klass->SetFinalizable(); 2169 } else { 2170 std::string klass_descriptor = klass->GetDescriptor(); 2171 // The Enum class declares a "final" finalize() method to prevent subclasses from 2172 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2173 // subclasses, so we exclude it here. 2174 // We also want to avoid setting the flag on Object, where we know that finalize() is 2175 // empty. 2176 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2177 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2178 klass->SetFinalizable(); 2179 } 2180 } 2181 } 2182 } else if (method_name[0] == '<') { 2183 // Fix broken access flags for initializers. Bug 11157540. 2184 bool is_init = (strcmp("<init>", method_name) == 0); 2185 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2186 if (UNLIKELY(!is_init && !is_clinit)) { 2187 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2188 } else { 2189 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2190 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2191 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2192 access_flags |= kAccConstructor; 2193 } 2194 } 2195 } 2196 dst->SetAccessFlags(access_flags); 2197 2198 self->EndAssertNoThreadSuspension(old_cause); 2199 return dst; 2200} 2201 2202void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2203 Thread* self = Thread::Current(); 2204 StackHandleScope<1> hs(self); 2205 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2206 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2207 AppendToBootClassPath(dex_file, dex_cache); 2208} 2209 2210void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2211 Handle<mirror::DexCache> dex_cache) { 2212 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2213 boot_class_path_.push_back(&dex_file); 2214 RegisterDexFile(dex_file, dex_cache); 2215} 2216 2217bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2218 dex_lock_.AssertSharedHeld(Thread::Current()); 2219 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2220 mirror::DexCache* dex_cache = GetDexCache(i); 2221 if (dex_cache->GetDexFile() == &dex_file) { 2222 return true; 2223 } 2224 } 2225 return false; 2226} 2227 2228bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2229 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2230 return IsDexFileRegisteredLocked(dex_file); 2231} 2232 2233void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2234 Handle<mirror::DexCache> dex_cache) { 2235 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2236 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2237 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2238 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2239 dex_caches_.push_back(dex_cache.Get()); 2240 dex_cache->SetDexFile(&dex_file); 2241 if (log_new_dex_caches_roots_) { 2242 // TODO: This is not safe if we can remove dex caches. 2243 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2244 } 2245} 2246 2247void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2248 Thread* self = Thread::Current(); 2249 { 2250 ReaderMutexLock mu(self, dex_lock_); 2251 if (IsDexFileRegisteredLocked(dex_file)) { 2252 return; 2253 } 2254 } 2255 // Don't alloc while holding the lock, since allocation may need to 2256 // suspend all threads and another thread may need the dex_lock_ to 2257 // get to a suspend point. 2258 StackHandleScope<1> hs(self); 2259 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2260 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2261 { 2262 WriterMutexLock mu(self, dex_lock_); 2263 if (IsDexFileRegisteredLocked(dex_file)) { 2264 return; 2265 } 2266 RegisterDexFileLocked(dex_file, dex_cache); 2267 } 2268} 2269 2270void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2271 Handle<mirror::DexCache> dex_cache) { 2272 WriterMutexLock mu(Thread::Current(), dex_lock_); 2273 RegisterDexFileLocked(dex_file, dex_cache); 2274} 2275 2276mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2277 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2278 // Search assuming unique-ness of dex file. 2279 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2280 mirror::DexCache* dex_cache = GetDexCache(i); 2281 if (dex_cache->GetDexFile() == &dex_file) { 2282 return dex_cache; 2283 } 2284 } 2285 // Search matching by location name. 2286 std::string location(dex_file.GetLocation()); 2287 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2288 mirror::DexCache* dex_cache = GetDexCache(i); 2289 if (dex_cache->GetDexFile()->GetLocation() == location) { 2290 return dex_cache; 2291 } 2292 } 2293 // Failure, dump diagnostic and abort. 2294 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2295 mirror::DexCache* dex_cache = GetDexCache(i); 2296 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2297 } 2298 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2299 return NULL; 2300} 2301 2302void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2303 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2304 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2305 mirror::DexCache* dex_cache = GetDexCache(i); 2306 dex_cache->Fixup(resolution_method); 2307 } 2308} 2309 2310mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2311 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2312 if (UNLIKELY(klass == NULL)) { 2313 return NULL; 2314 } 2315 return InitializePrimitiveClass(klass, type); 2316} 2317 2318mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2319 Primitive::Type type) { 2320 CHECK(primitive_class != NULL); 2321 // Must hold lock on object when initializing. 2322 Thread* self = Thread::Current(); 2323 StackHandleScope<1> hs(self); 2324 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2325 ObjectLock<mirror::Class> lock(self, h_class); 2326 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2327 primitive_class->SetPrimitiveType(type); 2328 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2329 const char* descriptor = Primitive::Descriptor(type); 2330 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2331 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2332 return primitive_class; 2333} 2334 2335// Create an array class (i.e. the class object for the array, not the 2336// array itself). "descriptor" looks like "[C" or "[[[[B" or 2337// "[Ljava/lang/String;". 2338// 2339// If "descriptor" refers to an array of primitives, look up the 2340// primitive type's internally-generated class object. 2341// 2342// "class_loader" is the class loader of the class that's referring to 2343// us. It's used to ensure that we're looking for the element type in 2344// the right context. It does NOT become the class loader for the 2345// array class; that always comes from the base element class. 2346// 2347// Returns NULL with an exception raised on failure. 2348mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2349 Handle<mirror::ClassLoader> class_loader) { 2350 // Identify the underlying component type 2351 CHECK_EQ('[', descriptor[0]); 2352 StackHandleScope<2> hs(self); 2353 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2354 if (component_type.Get() == nullptr) { 2355 DCHECK(self->IsExceptionPending()); 2356 return nullptr; 2357 } 2358 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2359 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2360 return nullptr; 2361 } 2362 // See if the component type is already loaded. Array classes are 2363 // always associated with the class loader of their underlying 2364 // element type -- an array of Strings goes with the loader for 2365 // java/lang/String -- so we need to look for it there. (The 2366 // caller should have checked for the existence of the class 2367 // before calling here, but they did so with *their* class loader, 2368 // not the component type's loader.) 2369 // 2370 // If we find it, the caller adds "loader" to the class' initiating 2371 // loader list, which should prevent us from going through this again. 2372 // 2373 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2374 // are the same, because our caller (FindClass) just did the 2375 // lookup. (Even if we get this wrong we still have correct behavior, 2376 // because we effectively do this lookup again when we add the new 2377 // class to the hash table --- necessary because of possible races with 2378 // other threads.) 2379 if (class_loader.Get() != component_type->GetClassLoader()) { 2380 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2381 if (new_class != NULL) { 2382 return new_class; 2383 } 2384 } 2385 2386 // Fill out the fields in the Class. 2387 // 2388 // It is possible to execute some methods against arrays, because 2389 // all arrays are subclasses of java_lang_Object_, so we need to set 2390 // up a vtable. We can just point at the one in java_lang_Object_. 2391 // 2392 // Array classes are simple enough that we don't need to do a full 2393 // link step. 2394 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2395 if (UNLIKELY(!init_done_)) { 2396 // Classes that were hand created, ie not by FindSystemClass 2397 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2398 new_class.Assign(GetClassRoot(kClassArrayClass)); 2399 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2400 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2401 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2402 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2403 } else if (strcmp(descriptor, 2404 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2405 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2406 } else if (strcmp(descriptor, 2407 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2408 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2409 } else if (strcmp(descriptor, "[C") == 0) { 2410 new_class.Assign(GetClassRoot(kCharArrayClass)); 2411 } else if (strcmp(descriptor, "[I") == 0) { 2412 new_class.Assign(GetClassRoot(kIntArrayClass)); 2413 } 2414 } 2415 if (new_class.Get() == nullptr) { 2416 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2417 if (new_class.Get() == nullptr) { 2418 return nullptr; 2419 } 2420 new_class->SetComponentType(component_type.Get()); 2421 } 2422 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2423 DCHECK(new_class->GetComponentType() != NULL); 2424 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2425 new_class->SetSuperClass(java_lang_Object); 2426 new_class->SetVTable(java_lang_Object->GetVTable()); 2427 new_class->SetPrimitiveType(Primitive::kPrimNot); 2428 new_class->SetClassLoader(component_type->GetClassLoader()); 2429 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2430 // don't need to set new_class->SetObjectSize(..) 2431 // because Object::SizeOf delegates to Array::SizeOf 2432 2433 2434 // All arrays have java/lang/Cloneable and java/io/Serializable as 2435 // interfaces. We need to set that up here, so that stuff like 2436 // "instanceof" works right. 2437 // 2438 // Note: The GC could run during the call to FindSystemClass, 2439 // so we need to make sure the class object is GC-valid while we're in 2440 // there. Do this by clearing the interface list so the GC will just 2441 // think that the entries are null. 2442 2443 2444 // Use the single, global copies of "interfaces" and "iftable" 2445 // (remember not to free them for arrays). 2446 { 2447 mirror::IfTable* array_iftable = 2448 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2449 CHECK(array_iftable != nullptr); 2450 new_class->SetIfTable(array_iftable); 2451 } 2452 2453 // Inherit access flags from the component type. 2454 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2455 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2456 access_flags &= kAccJavaFlagsMask; 2457 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2458 // and remove "interface". 2459 access_flags |= kAccAbstract | kAccFinal; 2460 access_flags &= ~kAccInterface; 2461 2462 new_class->SetAccessFlags(access_flags); 2463 2464 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2465 if (existing == nullptr) { 2466 return new_class.Get(); 2467 } 2468 // Another thread must have loaded the class after we 2469 // started but before we finished. Abandon what we've 2470 // done. 2471 // 2472 // (Yes, this happens.) 2473 2474 return existing; 2475} 2476 2477mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2478 switch (type) { 2479 case 'B': 2480 return GetClassRoot(kPrimitiveByte); 2481 case 'C': 2482 return GetClassRoot(kPrimitiveChar); 2483 case 'D': 2484 return GetClassRoot(kPrimitiveDouble); 2485 case 'F': 2486 return GetClassRoot(kPrimitiveFloat); 2487 case 'I': 2488 return GetClassRoot(kPrimitiveInt); 2489 case 'J': 2490 return GetClassRoot(kPrimitiveLong); 2491 case 'S': 2492 return GetClassRoot(kPrimitiveShort); 2493 case 'Z': 2494 return GetClassRoot(kPrimitiveBoolean); 2495 case 'V': 2496 return GetClassRoot(kPrimitiveVoid); 2497 default: 2498 break; 2499 } 2500 std::string printable_type(PrintableChar(type)); 2501 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2502 return NULL; 2503} 2504 2505mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2506 size_t hash) { 2507 if (VLOG_IS_ON(class_linker)) { 2508 mirror::DexCache* dex_cache = klass->GetDexCache(); 2509 std::string source; 2510 if (dex_cache != NULL) { 2511 source += " from "; 2512 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2513 } 2514 LOG(INFO) << "Loaded class " << descriptor << source; 2515 } 2516 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2517 mirror::Class* existing = 2518 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2519 if (existing != NULL) { 2520 return existing; 2521 } 2522 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2523 // Check a class loaded with the system class loader matches one in the image if the class 2524 // is in the image. 2525 existing = LookupClassFromImage(descriptor); 2526 if (existing != NULL) { 2527 CHECK(klass == existing); 2528 } 2529 } 2530 VerifyObject(klass); 2531 class_table_.insert(std::make_pair(hash, klass)); 2532 if (log_new_class_table_roots_) { 2533 new_class_roots_.push_back(std::make_pair(hash, klass)); 2534 } 2535 return NULL; 2536} 2537 2538bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2539 size_t hash = Hash(descriptor); 2540 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2541 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2542 it != end && it->first == hash; 2543 ++it) { 2544 mirror::Class** root = &it->second; 2545 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2546 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2547 class_table_.erase(it); 2548 return true; 2549 } 2550 } 2551 return false; 2552} 2553 2554mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2555 const mirror::ClassLoader* class_loader) { 2556 size_t hash = Hash(descriptor); 2557 { 2558 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2559 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2560 if (result != NULL) { 2561 return result; 2562 } 2563 } 2564 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2565 return NULL; 2566 } else { 2567 // Lookup failed but need to search dex_caches_. 2568 mirror::Class* result = LookupClassFromImage(descriptor); 2569 if (result != NULL) { 2570 InsertClass(descriptor, result, hash); 2571 } else { 2572 // Searching the image dex files/caches failed, we don't want to get into this situation 2573 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2574 // classes into the class table. 2575 const int32_t kMaxFailedDexCacheLookups = 1000; 2576 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2577 MoveImageClassesToClassTable(); 2578 } 2579 } 2580 return result; 2581 } 2582} 2583 2584mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2585 const mirror::ClassLoader* class_loader, 2586 size_t hash) { 2587 auto end = class_table_.end(); 2588 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2589 mirror::Class** root = &it->second; 2590 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2591 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2592 if (kIsDebugBuild) { 2593 // Check for duplicates in the table. 2594 for (++it; it != end && it->first == hash; ++it) { 2595 mirror::Class** root2 = &it->second; 2596 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2597 CHECK(!(klass2->GetClassLoader() == class_loader && 2598 klass2->DescriptorEquals(descriptor))) 2599 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2600 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2601 } 2602 } 2603 return klass; 2604 } 2605 } 2606 return NULL; 2607} 2608 2609static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2610 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2611 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2612 CHECK(image != NULL); 2613 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2614 return root->AsObjectArray<mirror::DexCache>(); 2615} 2616 2617void ClassLinker::MoveImageClassesToClassTable() { 2618 Thread* self = Thread::Current(); 2619 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2620 if (!dex_cache_image_class_lookup_required_) { 2621 return; // All dex cache classes are already in the class table. 2622 } 2623 const char* old_no_suspend_cause = 2624 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2625 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2626 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2627 mirror::DexCache* dex_cache = dex_caches->Get(i); 2628 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2629 for (int32_t j = 0; j < types->GetLength(); j++) { 2630 mirror::Class* klass = types->Get(j); 2631 if (klass != NULL) { 2632 DCHECK(klass->GetClassLoader() == NULL); 2633 std::string descriptor = klass->GetDescriptor(); 2634 size_t hash = Hash(descriptor.c_str()); 2635 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2636 if (existing != NULL) { 2637 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2638 << PrettyClassAndClassLoader(klass); 2639 } else { 2640 class_table_.insert(std::make_pair(hash, klass)); 2641 if (log_new_class_table_roots_) { 2642 new_class_roots_.push_back(std::make_pair(hash, klass)); 2643 } 2644 } 2645 } 2646 } 2647 } 2648 dex_cache_image_class_lookup_required_ = false; 2649 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2650} 2651 2652mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2653 Thread* self = Thread::Current(); 2654 const char* old_no_suspend_cause = 2655 self->StartAssertNoThreadSuspension("Image class lookup"); 2656 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2657 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2658 mirror::DexCache* dex_cache = dex_caches->Get(i); 2659 const DexFile* dex_file = dex_cache->GetDexFile(); 2660 // Try binary searching the string/type index. 2661 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2662 if (string_id != NULL) { 2663 const DexFile::TypeId* type_id = 2664 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2665 if (type_id != NULL) { 2666 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2667 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2668 if (klass != NULL) { 2669 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2670 return klass; 2671 } 2672 } 2673 } 2674 } 2675 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2676 return NULL; 2677} 2678 2679void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2680 result.clear(); 2681 if (dex_cache_image_class_lookup_required_) { 2682 MoveImageClassesToClassTable(); 2683 } 2684 size_t hash = Hash(descriptor); 2685 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2686 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2687 it != end && it->first == hash; ++it) { 2688 mirror::Class** root = &it->second; 2689 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2690 if (klass->DescriptorEquals(descriptor)) { 2691 result.push_back(klass); 2692 } 2693 } 2694} 2695 2696void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2697 // TODO: assert that the monitor on the Class is held 2698 Thread* self = Thread::Current(); 2699 ObjectLock<mirror::Class> lock(self, klass); 2700 2701 // Don't attempt to re-verify if already sufficiently verified. 2702 if (klass->IsVerified() || 2703 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2704 return; 2705 } 2706 2707 // The class might already be erroneous, for example at compile time if we attempted to verify 2708 // this class as a parent to another. 2709 if (klass->IsErroneous()) { 2710 ThrowEarlierClassFailure(klass.Get()); 2711 return; 2712 } 2713 2714 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2715 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2716 } else { 2717 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2718 << PrettyClass(klass.Get()); 2719 CHECK(!Runtime::Current()->IsCompiler()); 2720 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2721 } 2722 2723 // Skip verification if disabled. 2724 if (!Runtime::Current()->IsVerificationEnabled()) { 2725 klass->SetStatus(mirror::Class::kStatusVerified, self); 2726 return; 2727 } 2728 2729 // Verify super class. 2730 StackHandleScope<2> hs(self); 2731 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2732 if (super.Get() != NULL) { 2733 // Acquire lock to prevent races on verifying the super class. 2734 ObjectLock<mirror::Class> lock(self, super); 2735 2736 if (!super->IsVerified() && !super->IsErroneous()) { 2737 VerifyClass(super); 2738 } 2739 if (!super->IsCompileTimeVerified()) { 2740 std::string error_msg( 2741 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2742 PrettyDescriptor(klass.Get()).c_str(), 2743 PrettyDescriptor(super.Get()).c_str())); 2744 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2745 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2746 if (cause.Get() != nullptr) { 2747 self->ClearException(); 2748 } 2749 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2750 if (cause.Get() != nullptr) { 2751 self->GetException(nullptr)->SetCause(cause.Get()); 2752 } 2753 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2754 if (Runtime::Current()->IsCompiler()) { 2755 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2756 } 2757 klass->SetStatus(mirror::Class::kStatusError, self); 2758 return; 2759 } 2760 } 2761 2762 // Try to use verification information from the oat file, otherwise do runtime verification. 2763 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2764 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2765 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2766 if (oat_file_class_status == mirror::Class::kStatusError) { 2767 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2768 << PrettyDescriptor(klass.Get()) << " in " 2769 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2770 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2771 PrettyDescriptor(klass.Get()).c_str()); 2772 klass->SetStatus(mirror::Class::kStatusError, self); 2773 return; 2774 } 2775 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2776 std::string error_msg; 2777 if (!preverified) { 2778 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2779 Runtime::Current()->IsCompiler(), 2780 &error_msg); 2781 } 2782 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2783 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2784 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2785 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2786 << " because: " << error_msg; 2787 } 2788 self->AssertNoPendingException(); 2789 // Make sure all classes referenced by catch blocks are resolved. 2790 ResolveClassExceptionHandlerTypes(dex_file, klass); 2791 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2792 // Even though there were no verifier failures we need to respect whether the super-class 2793 // was verified or requiring runtime reverification. 2794 if (super.Get() == NULL || super->IsVerified()) { 2795 klass->SetStatus(mirror::Class::kStatusVerified, self); 2796 } else { 2797 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2798 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2799 // Pretend a soft failure occured so that we don't consider the class verified below. 2800 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2801 } 2802 } else { 2803 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2804 // Soft failures at compile time should be retried at runtime. Soft 2805 // failures at runtime will be handled by slow paths in the generated 2806 // code. Set status accordingly. 2807 if (Runtime::Current()->IsCompiler()) { 2808 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2809 } else { 2810 klass->SetStatus(mirror::Class::kStatusVerified, self); 2811 } 2812 } 2813 } else { 2814 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2815 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2816 << " because: " << error_msg; 2817 self->AssertNoPendingException(); 2818 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2819 klass->SetStatus(mirror::Class::kStatusError, self); 2820 } 2821 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2822 // Class is verified so we don't need to do any access check on its methods. 2823 // Let the interpreter know it by setting the kAccPreverified flag onto each 2824 // method. 2825 // Note: we're going here during compilation and at runtime. When we set the 2826 // kAccPreverified flag when compiling image classes, the flag is recorded 2827 // in the image and is set when loading the image. 2828 klass->SetPreverifiedFlagOnAllMethods(); 2829 } 2830} 2831 2832bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2833 mirror::Class::Status& oat_file_class_status) { 2834 // If we're compiling, we can only verify the class using the oat file if 2835 // we are not compiling the image or if the class we're verifying is not part of 2836 // the app. In other words, we will only check for preverification of bootclasspath 2837 // classes. 2838 if (Runtime::Current()->IsCompiler()) { 2839 // Are we compiling the bootclasspath? 2840 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2841 return false; 2842 } 2843 // We are compiling an app (not the image). 2844 2845 // Is this an app class? (I.e. not a bootclasspath class) 2846 if (klass->GetClassLoader() != NULL) { 2847 return false; 2848 } 2849 } 2850 2851 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2852 // Make this work with gtests, which do not set up the image properly. 2853 // TODO: we should clean up gtests to set up the image path properly. 2854 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2855 return false; 2856 } 2857 2858 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2859 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2860 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2861 &dex_location_checksum); 2862 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2863 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2864 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2865 if (oat_file_class_status == mirror::Class::kStatusVerified || 2866 oat_file_class_status == mirror::Class::kStatusInitialized) { 2867 return true; 2868 } 2869 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2870 // Compile time verification failed with a soft error. Compile time verification can fail 2871 // because we have incomplete type information. Consider the following: 2872 // class ... { 2873 // Foo x; 2874 // .... () { 2875 // if (...) { 2876 // v1 gets assigned a type of resolved class Foo 2877 // } else { 2878 // v1 gets assigned a type of unresolved class Bar 2879 // } 2880 // iput x = v1 2881 // } } 2882 // when we merge v1 following the if-the-else it results in Conflict 2883 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2884 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2885 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2886 // at compile time). 2887 return false; 2888 } 2889 if (oat_file_class_status == mirror::Class::kStatusError) { 2890 // Compile time verification failed with a hard error. This is caused by invalid instructions 2891 // in the class. These errors are unrecoverable. 2892 return false; 2893 } 2894 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2895 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2896 // not loading the class. 2897 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2898 // isn't a problem and this case shouldn't occur 2899 return false; 2900 } 2901 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2902 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2903 << klass->GetDescriptor(); 2904 2905 return false; 2906} 2907 2908void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2909 Handle<mirror::Class> klass) { 2910 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2911 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2912 } 2913 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2914 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2915 } 2916} 2917 2918void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2919 mirror::ArtMethod* method) { 2920 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2921 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2922 if (code_item == NULL) { 2923 return; // native or abstract method 2924 } 2925 if (code_item->tries_size_ == 0) { 2926 return; // nothing to process 2927 } 2928 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2929 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2930 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2931 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2932 CatchHandlerIterator iterator(handlers_ptr); 2933 for (; iterator.HasNext(); iterator.Next()) { 2934 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2935 // unresolved exception types will be ignored by exception delivery 2936 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2937 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2938 if (exception_type == NULL) { 2939 DCHECK(Thread::Current()->IsExceptionPending()); 2940 Thread::Current()->ClearException(); 2941 } 2942 } 2943 } 2944 handlers_ptr = iterator.EndDataPointer(); 2945 } 2946} 2947 2948static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2949static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2950 Handle<mirror::ArtMethod> prototype); 2951 2952mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2953 jobjectArray interfaces, jobject loader, 2954 jobjectArray methods, jobjectArray throws) { 2955 Thread* self = soa.Self(); 2956 StackHandleScope<8> hs(self); 2957 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2958 sizeof(mirror::SynthesizedProxyClass)))); 2959 if (klass.Get() == NULL) { 2960 CHECK(self->IsExceptionPending()); // OOME. 2961 return NULL; 2962 } 2963 DCHECK(klass->GetClass() != NULL); 2964 klass->SetObjectSize(sizeof(mirror::Proxy)); 2965 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2966 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2967 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2968 klass->SetName(soa.Decode<mirror::String*>(name)); 2969 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2970 klass->SetDexCache(proxy_class->GetDexCache()); 2971 klass->SetStatus(mirror::Class::kStatusIdx, self); 2972 2973 // Instance fields are inherited, but we add a couple of static fields... 2974 { 2975 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2976 if (UNLIKELY(sfields == NULL)) { 2977 CHECK(self->IsExceptionPending()); // OOME. 2978 return NULL; 2979 } 2980 klass->SetSFields(sfields); 2981 } 2982 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2983 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2984 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2985 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2986 CHECK(self->IsExceptionPending()); // OOME. 2987 return nullptr; 2988 } 2989 klass->SetStaticField(0, interfaces_sfield.Get()); 2990 interfaces_sfield->SetDexFieldIndex(0); 2991 interfaces_sfield->SetDeclaringClass(klass.Get()); 2992 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2993 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2994 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2995 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2996 CHECK(self->IsExceptionPending()); // OOME. 2997 return nullptr; 2998 } 2999 klass->SetStaticField(1, throws_sfield.Get()); 3000 throws_sfield->SetDexFieldIndex(1); 3001 throws_sfield->SetDeclaringClass(klass.Get()); 3002 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3003 3004 // Proxies have 1 direct method, the constructor 3005 { 3006 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3007 if (UNLIKELY(directs == nullptr)) { 3008 CHECK(self->IsExceptionPending()); // OOME. 3009 return nullptr; 3010 } 3011 klass->SetDirectMethods(directs); 3012 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3013 if (UNLIKELY(constructor == nullptr)) { 3014 CHECK(self->IsExceptionPending()); // OOME. 3015 return nullptr; 3016 } 3017 klass->SetDirectMethod(0, constructor); 3018 } 3019 3020 // Create virtual method using specified prototypes. 3021 size_t num_virtual_methods = 3022 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3023 { 3024 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3025 num_virtual_methods); 3026 if (UNLIKELY(virtuals == NULL)) { 3027 CHECK(self->IsExceptionPending()); // OOME. 3028 return NULL; 3029 } 3030 klass->SetVirtualMethods(virtuals); 3031 } 3032 for (size_t i = 0; i < num_virtual_methods; ++i) { 3033 StackHandleScope<1> hs(self); 3034 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3035 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3036 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3037 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3038 if (UNLIKELY(clone == nullptr)) { 3039 CHECK(self->IsExceptionPending()); // OOME. 3040 return nullptr; 3041 } 3042 klass->SetVirtualMethod(i, clone); 3043 } 3044 3045 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3046 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3047 self->AssertNoPendingException(); 3048 3049 { 3050 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 3051 // Link the fields and virtual methods, creating vtable and iftables 3052 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 3053 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3054 if (!LinkClass(self, klass, h_interfaces)) { 3055 klass->SetStatus(mirror::Class::kStatusError, self); 3056 return nullptr; 3057 } 3058 3059 interfaces_sfield->SetObject<false>( 3060 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3061 throws_sfield->SetObject<false>( 3062 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3063 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3064 } 3065 3066 // sanity checks 3067 if (kIsDebugBuild) { 3068 CHECK(klass->GetIFields() == nullptr); 3069 CheckProxyConstructor(klass->GetDirectMethod(0)); 3070 for (size_t i = 0; i < num_virtual_methods; ++i) { 3071 StackHandleScope<2> hs(self); 3072 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3073 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3074 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3075 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3076 CheckProxyMethod(virtual_method, prototype); 3077 } 3078 3079 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3080 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3081 decoded_name->ToModifiedUtf8().c_str())); 3082 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3083 3084 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3085 decoded_name->ToModifiedUtf8().c_str())); 3086 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3087 3088 mirror::SynthesizedProxyClass* synth_proxy_class = 3089 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 3090 CHECK_EQ(synth_proxy_class->GetInterfaces(), 3091 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3092 CHECK_EQ(synth_proxy_class->GetThrows(), 3093 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3094 } 3095 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3096 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3097 CHECK(existing == nullptr); 3098 return klass.Get(); 3099} 3100 3101std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3102 DCHECK(proxy_class->IsProxyClass()); 3103 mirror::String* name = proxy_class->GetName(); 3104 DCHECK(name != NULL); 3105 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3106} 3107 3108mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3109 mirror::ArtMethod* proxy_method) { 3110 DCHECK(proxy_class->IsProxyClass()); 3111 DCHECK(proxy_method->IsProxyMethod()); 3112 // Locate the dex cache of the original interface/Object 3113 mirror::DexCache* dex_cache = NULL; 3114 { 3115 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3116 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3117 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3118 mirror::DexCache* a_dex_cache = GetDexCache(i); 3119 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3120 dex_cache = a_dex_cache; 3121 break; 3122 } 3123 } 3124 } 3125 CHECK(dex_cache != NULL); 3126 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3127 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3128 CHECK(resolved_method != NULL); 3129 return resolved_method; 3130} 3131 3132 3133mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3134 Handle<mirror::Class> klass, 3135 mirror::Class* proxy_class) { 3136 // Create constructor for Proxy that must initialize h 3137 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3138 proxy_class->GetDirectMethods(); 3139 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3140 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3141 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3142 // code_ too) 3143 mirror::ArtMethod* constructor = 3144 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3145 if (constructor == NULL) { 3146 CHECK(self->IsExceptionPending()); // OOME. 3147 return NULL; 3148 } 3149 // Make this constructor public and fix the class to be our Proxy version 3150 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3151 constructor->SetDeclaringClass(klass.Get()); 3152 return constructor; 3153} 3154 3155static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3156 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3157 CHECK(constructor->IsConstructor()); 3158 CHECK_STREQ(constructor->GetName(), "<init>"); 3159 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3160 "(Ljava/lang/reflect/InvocationHandler;)V"); 3161 DCHECK(constructor->IsPublic()); 3162} 3163 3164mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3165 Handle<mirror::Class> klass, 3166 Handle<mirror::ArtMethod> prototype) { 3167 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3168 // prototype method 3169 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3170 prototype.Get()); 3171 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3172 // as necessary 3173 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3174 if (UNLIKELY(method == NULL)) { 3175 CHECK(self->IsExceptionPending()); // OOME. 3176 return NULL; 3177 } 3178 3179 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3180 // the intersection of throw exceptions as defined in Proxy 3181 method->SetDeclaringClass(klass.Get()); 3182 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3183 3184 // At runtime the method looks like a reference and argument saving method, clone the code 3185 // related parameters from this method. 3186 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3187 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3188 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3189 3190 return method; 3191} 3192 3193static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3194 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3195 // Basic sanity 3196 CHECK(!prototype->IsFinal()); 3197 CHECK(method->IsFinal()); 3198 CHECK(!method->IsAbstract()); 3199 3200 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3201 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3202 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3203 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3204 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3205 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3206 3207 MethodHelper mh(method); 3208 MethodHelper mh2(prototype); 3209 CHECK_STREQ(method->GetName(), prototype->GetName()); 3210 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3211 // More complex sanity - via dex cache 3212 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3213} 3214 3215static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3216 bool can_init_parents) 3217 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3218 if (can_init_statics && can_init_parents) { 3219 return true; 3220 } 3221 if (!can_init_statics) { 3222 // Check if there's a class initializer. 3223 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3224 if (clinit != NULL) { 3225 return false; 3226 } 3227 // Check if there are encoded static values needing initialization. 3228 if (klass->NumStaticFields() != 0) { 3229 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3230 DCHECK(dex_class_def != NULL); 3231 if (dex_class_def->static_values_off_ != 0) { 3232 return false; 3233 } 3234 } 3235 } 3236 if (!klass->IsInterface() && klass->HasSuperClass()) { 3237 mirror::Class* super_class = klass->GetSuperClass(); 3238 if (!can_init_parents && !super_class->IsInitialized()) { 3239 return false; 3240 } else { 3241 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3242 return false; 3243 } 3244 } 3245 } 3246 return true; 3247} 3248 3249bool ClassLinker::IsInitialized() const { 3250 return init_done_; 3251} 3252 3253bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3254 bool can_init_parents) { 3255 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3256 3257 // Are we already initialized and therefore done? 3258 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3259 // an initialized class will never change its state. 3260 if (klass->IsInitialized()) { 3261 return true; 3262 } 3263 3264 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3265 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3266 return false; 3267 } 3268 3269 Thread* self = Thread::Current(); 3270 uint64_t t0; 3271 { 3272 ObjectLock<mirror::Class> lock(self, klass); 3273 3274 // Re-check under the lock in case another thread initialized ahead of us. 3275 if (klass->IsInitialized()) { 3276 return true; 3277 } 3278 3279 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3280 if (klass->IsErroneous()) { 3281 ThrowEarlierClassFailure(klass.Get()); 3282 return false; 3283 } 3284 3285 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3286 3287 if (!klass->IsVerified()) { 3288 VerifyClass(klass); 3289 if (!klass->IsVerified()) { 3290 // We failed to verify, expect either the klass to be erroneous or verification failed at 3291 // compile time. 3292 if (klass->IsErroneous()) { 3293 CHECK(self->IsExceptionPending()); 3294 } else { 3295 CHECK(Runtime::Current()->IsCompiler()); 3296 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3297 } 3298 return false; 3299 } 3300 } 3301 3302 // If the class is kStatusInitializing, either this thread is 3303 // initializing higher up the stack or another thread has beat us 3304 // to initializing and we need to wait. Either way, this 3305 // invocation of InitializeClass will not be responsible for 3306 // running <clinit> and will return. 3307 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3308 // We caught somebody else in the act; was it us? 3309 if (klass->GetClinitThreadId() == self->GetTid()) { 3310 // Yes. That's fine. Return so we can continue initializing. 3311 return true; 3312 } 3313 // No. That's fine. Wait for another thread to finish initializing. 3314 return WaitForInitializeClass(klass, self, lock); 3315 } 3316 3317 if (!ValidateSuperClassDescriptors(klass)) { 3318 klass->SetStatus(mirror::Class::kStatusError, self); 3319 return false; 3320 } 3321 3322 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3323 3324 // From here out other threads may observe that we're initializing and so changes of state 3325 // require the a notification. 3326 klass->SetClinitThreadId(self->GetTid()); 3327 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3328 3329 t0 = NanoTime(); 3330 } 3331 3332 // Initialize super classes, must be done while initializing for the JLS. 3333 if (!klass->IsInterface() && klass->HasSuperClass()) { 3334 mirror::Class* super_class = klass->GetSuperClass(); 3335 if (!super_class->IsInitialized()) { 3336 CHECK(!super_class->IsInterface()); 3337 CHECK(can_init_parents); 3338 StackHandleScope<1> hs(self); 3339 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3340 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3341 if (!super_initialized) { 3342 // The super class was verified ahead of entering initializing, we should only be here if 3343 // the super class became erroneous due to initialization. 3344 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3345 << "Super class initialization failed for " 3346 << PrettyDescriptor(handle_scope_super.Get()) 3347 << " that has unexpected status " << handle_scope_super->GetStatus() 3348 << "\nPending exception:\n" 3349 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3350 ObjectLock<mirror::Class> lock(self, klass); 3351 // Initialization failed because the super-class is erroneous. 3352 klass->SetStatus(mirror::Class::kStatusError, self); 3353 return false; 3354 } 3355 } 3356 } 3357 3358 if (klass->NumStaticFields() > 0) { 3359 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3360 CHECK(dex_class_def != NULL); 3361 const DexFile& dex_file = klass->GetDexFile(); 3362 StackHandleScope<2> hs(self); 3363 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3364 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3365 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3366 this, *dex_class_def); 3367 if (it.HasNext()) { 3368 CHECK(can_init_statics); 3369 // We reordered the fields, so we need to be able to map the 3370 // field indexes to the right fields. 3371 SafeMap<uint32_t, mirror::ArtField*> field_map; 3372 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3373 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3374 if (Runtime::Current()->IsActiveTransaction()) { 3375 it.ReadValueToField<true>(field_map.Get(i)); 3376 } else { 3377 it.ReadValueToField<false>(field_map.Get(i)); 3378 } 3379 } 3380 } 3381 } 3382 3383 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3384 if (clinit != NULL) { 3385 CHECK(can_init_statics); 3386 JValue result; 3387 clinit->Invoke(self, NULL, 0, &result, "V"); 3388 } 3389 3390 uint64_t t1 = NanoTime(); 3391 3392 bool success = true; 3393 { 3394 ObjectLock<mirror::Class> lock(self, klass); 3395 3396 if (self->IsExceptionPending()) { 3397 WrapExceptionInInitializer(); 3398 klass->SetStatus(mirror::Class::kStatusError, self); 3399 success = false; 3400 } else { 3401 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3402 RuntimeStats* thread_stats = self->GetStats(); 3403 ++global_stats->class_init_count; 3404 ++thread_stats->class_init_count; 3405 global_stats->class_init_time_ns += (t1 - t0); 3406 thread_stats->class_init_time_ns += (t1 - t0); 3407 // Set the class as initialized except if failed to initialize static fields. 3408 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3409 if (VLOG_IS_ON(class_linker)) { 3410 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3411 klass->GetLocation(); 3412 } 3413 // Opportunistically set static method trampolines to their destination. 3414 FixupStaticTrampolines(klass.Get()); 3415 } 3416 } 3417 return success; 3418} 3419 3420bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3421 ObjectLock<mirror::Class>& lock) 3422 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3423 while (true) { 3424 self->AssertNoPendingException(); 3425 CHECK(!klass->IsInitialized()); 3426 lock.WaitIgnoringInterrupts(); 3427 3428 // When we wake up, repeat the test for init-in-progress. If 3429 // there's an exception pending (only possible if 3430 // "interruptShouldThrow" was set), bail out. 3431 if (self->IsExceptionPending()) { 3432 WrapExceptionInInitializer(); 3433 klass->SetStatus(mirror::Class::kStatusError, self); 3434 return false; 3435 } 3436 // Spurious wakeup? Go back to waiting. 3437 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3438 continue; 3439 } 3440 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3441 // Compile time initialization failed. 3442 return false; 3443 } 3444 if (klass->IsErroneous()) { 3445 // The caller wants an exception, but it was thrown in a 3446 // different thread. Synthesize one here. 3447 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3448 PrettyDescriptor(klass.Get()).c_str()); 3449 return false; 3450 } 3451 if (klass->IsInitialized()) { 3452 return true; 3453 } 3454 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3455 << klass->GetStatus(); 3456 } 3457 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3458} 3459 3460bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3461 if (klass->IsInterface()) { 3462 return true; 3463 } 3464 // Begin with the methods local to the superclass. 3465 StackHandleScope<2> hs(Thread::Current()); 3466 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3467 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3468 if (klass->HasSuperClass() && 3469 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3470 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3471 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3472 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3473 if (mh.GetMethod() != super_mh.GetMethod() && 3474 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3475 ThrowLinkageError(klass.Get(), 3476 "Class %s method %s resolves differently in superclass %s", 3477 PrettyDescriptor(klass.Get()).c_str(), 3478 PrettyMethod(mh.GetMethod()).c_str(), 3479 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3480 return false; 3481 } 3482 } 3483 } 3484 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3485 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3486 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3487 for (uint32_t j = 0; j < num_methods; ++j) { 3488 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3489 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3490 if (mh.GetMethod() != super_mh.GetMethod() && 3491 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3492 ThrowLinkageError(klass.Get(), 3493 "Class %s method %s resolves differently in interface %s", 3494 PrettyDescriptor(klass.Get()).c_str(), 3495 PrettyMethod(mh.GetMethod()).c_str(), 3496 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3497 return false; 3498 } 3499 } 3500 } 3501 } 3502 return true; 3503} 3504 3505bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3506 bool can_init_parents) { 3507 DCHECK(c.Get() != nullptr); 3508 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3509 if (!success && can_init_fields && can_init_parents) { 3510 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3511 } 3512 return success; 3513} 3514 3515void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3516 mirror::Class* c, 3517 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3518 const byte* class_data = dex_file.GetClassData(dex_class_def); 3519 ClassDataItemIterator it(dex_file, class_data); 3520 StackHandleScope<2> hs(Thread::Current()); 3521 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3522 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3523 CHECK(!kMovingFields); 3524 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3525 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3526 } 3527} 3528 3529bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3530 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3531 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3532 if (!LinkSuperClass(klass)) { 3533 return false; 3534 } 3535 if (!LinkMethods(self, klass, interfaces)) { 3536 return false; 3537 } 3538 if (!LinkInstanceFields(klass)) { 3539 return false; 3540 } 3541 if (!LinkStaticFields(klass)) { 3542 return false; 3543 } 3544 CreateReferenceInstanceOffsets(klass); 3545 CreateReferenceStaticOffsets(klass); 3546 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3547 klass->SetStatus(mirror::Class::kStatusResolved, self); 3548 return true; 3549} 3550 3551bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3552 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3553 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3554 uint16_t super_class_idx = class_def.superclass_idx_; 3555 if (super_class_idx != DexFile::kDexNoIndex16) { 3556 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3557 if (super_class == NULL) { 3558 DCHECK(Thread::Current()->IsExceptionPending()); 3559 return false; 3560 } 3561 // Verify 3562 if (!klass->CanAccess(super_class)) { 3563 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3564 PrettyDescriptor(super_class).c_str(), 3565 PrettyDescriptor(klass.Get()).c_str()); 3566 return false; 3567 } 3568 klass->SetSuperClass(super_class); 3569 } 3570 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3571 if (interfaces != NULL) { 3572 for (size_t i = 0; i < interfaces->Size(); i++) { 3573 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3574 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3575 if (interface == NULL) { 3576 DCHECK(Thread::Current()->IsExceptionPending()); 3577 return false; 3578 } 3579 // Verify 3580 if (!klass->CanAccess(interface)) { 3581 // TODO: the RI seemed to ignore this in my testing. 3582 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3583 PrettyDescriptor(interface).c_str(), 3584 PrettyDescriptor(klass.Get()).c_str()); 3585 return false; 3586 } 3587 } 3588 } 3589 // Mark the class as loaded. 3590 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3591 return true; 3592} 3593 3594bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3595 CHECK(!klass->IsPrimitive()); 3596 mirror::Class* super = klass->GetSuperClass(); 3597 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3598 if (super != NULL) { 3599 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3600 return false; 3601 } 3602 return true; 3603 } 3604 if (super == NULL) { 3605 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3606 PrettyDescriptor(klass.Get()).c_str()); 3607 return false; 3608 } 3609 // Verify 3610 if (super->IsFinal() || super->IsInterface()) { 3611 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3612 PrettyDescriptor(super).c_str(), 3613 PrettyDescriptor(klass.Get()).c_str(), 3614 super->IsFinal() ? "declared final" : "an interface"); 3615 return false; 3616 } 3617 if (!klass->CanAccess(super)) { 3618 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3619 PrettyDescriptor(super).c_str(), 3620 PrettyDescriptor(klass.Get()).c_str()); 3621 return false; 3622 } 3623 3624 // Inherit kAccClassIsFinalizable from the superclass in case this 3625 // class doesn't override finalize. 3626 if (super->IsFinalizable()) { 3627 klass->SetFinalizable(); 3628 } 3629 3630 // Inherit reference flags (if any) from the superclass. 3631 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3632 if (reference_flags != 0) { 3633 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3634 } 3635 // Disallow custom direct subclasses of java.lang.ref.Reference. 3636 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3637 ThrowLinkageError(klass.Get(), 3638 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3639 PrettyDescriptor(klass.Get()).c_str()); 3640 return false; 3641 } 3642 3643 if (kIsDebugBuild) { 3644 // Ensure super classes are fully resolved prior to resolving fields.. 3645 while (super != NULL) { 3646 CHECK(super->IsResolved()); 3647 super = super->GetSuperClass(); 3648 } 3649 } 3650 return true; 3651} 3652 3653// Populate the class vtable and itable. Compute return type indices. 3654bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3655 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3656 if (klass->IsInterface()) { 3657 // No vtable. 3658 size_t count = klass->NumVirtualMethods(); 3659 if (!IsUint(16, count)) { 3660 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3661 return false; 3662 } 3663 for (size_t i = 0; i < count; ++i) { 3664 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3665 } 3666 // Link interface method tables 3667 return LinkInterfaceMethods(klass, interfaces); 3668 } else { 3669 // Link virtual and interface method tables 3670 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3671 } 3672 return true; 3673} 3674 3675bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3676 if (klass->HasSuperClass()) { 3677 uint32_t max_count = klass->NumVirtualMethods() + 3678 klass->GetSuperClass()->GetVTable()->GetLength(); 3679 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3680 CHECK_LE(actual_count, max_count); 3681 // TODO: do not assign to the vtable field until it is fully constructed. 3682 StackHandleScope<3> hs(self); 3683 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3684 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3685 if (UNLIKELY(vtable.Get() == NULL)) { 3686 CHECK(self->IsExceptionPending()); // OOME. 3687 return false; 3688 } 3689 // See if any of our virtual methods override the superclass. 3690 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3691 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3692 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3693 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3694 local_mh.ChangeMethod(local_method); 3695 size_t j = 0; 3696 for (; j < actual_count; ++j) { 3697 mirror::ArtMethod* super_method = vtable->Get(j); 3698 super_mh.ChangeMethod(super_method); 3699 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3700 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3701 super_method->GetAccessFlags())) { 3702 if (super_method->IsFinal()) { 3703 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3704 PrettyMethod(local_method).c_str(), 3705 super_method->GetDeclaringClassDescriptor()); 3706 return false; 3707 } 3708 vtable->Set<false>(j, local_method); 3709 local_method->SetMethodIndex(j); 3710 break; 3711 } else { 3712 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3713 << " would have incorrectly overridden the package-private method in " 3714 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3715 } 3716 } 3717 } 3718 if (j == actual_count) { 3719 // Not overriding, append. 3720 vtable->Set<false>(actual_count, local_method); 3721 local_method->SetMethodIndex(actual_count); 3722 actual_count += 1; 3723 } 3724 } 3725 if (!IsUint(16, actual_count)) { 3726 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3727 return false; 3728 } 3729 // Shrink vtable if possible 3730 CHECK_LE(actual_count, max_count); 3731 if (actual_count < max_count) { 3732 vtable.Assign(vtable->CopyOf(self, actual_count)); 3733 if (UNLIKELY(vtable.Get() == NULL)) { 3734 CHECK(self->IsExceptionPending()); // OOME. 3735 return false; 3736 } 3737 } 3738 klass->SetVTable(vtable.Get()); 3739 } else { 3740 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3741 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3742 if (!IsUint(16, num_virtual_methods)) { 3743 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3744 return false; 3745 } 3746 StackHandleScope<1> hs(self); 3747 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3748 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3749 if (UNLIKELY(vtable.Get() == NULL)) { 3750 CHECK(self->IsExceptionPending()); // OOME. 3751 return false; 3752 } 3753 for (size_t i = 0; i < num_virtual_methods; ++i) { 3754 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3755 vtable->Set<false>(i, virtual_method); 3756 virtual_method->SetMethodIndex(i & 0xFFFF); 3757 } 3758 klass->SetVTable(vtable.Get()); 3759 } 3760 return true; 3761} 3762 3763bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3764 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3765 Thread* const self = Thread::Current(); 3766 Runtime* const runtime = Runtime::Current(); 3767 // Set the imt table to be all conflicts by default. 3768 klass->SetImTable(runtime->GetDefaultImt()); 3769 size_t super_ifcount; 3770 if (klass->HasSuperClass()) { 3771 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3772 } else { 3773 super_ifcount = 0; 3774 } 3775 uint32_t num_interfaces = 3776 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3777 size_t ifcount = super_ifcount + num_interfaces; 3778 for (size_t i = 0; i < num_interfaces; i++) { 3779 mirror::Class* interface = 3780 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3781 interfaces->Get(i); 3782 ifcount += interface->GetIfTableCount(); 3783 } 3784 if (ifcount == 0) { 3785 // Class implements no interfaces. 3786 DCHECK_EQ(klass->GetIfTableCount(), 0); 3787 DCHECK(klass->GetIfTable() == NULL); 3788 return true; 3789 } 3790 if (ifcount == super_ifcount) { 3791 // Class implements same interfaces as parent, are any of these not marker interfaces? 3792 bool has_non_marker_interface = false; 3793 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3794 for (size_t i = 0; i < ifcount; ++i) { 3795 if (super_iftable->GetMethodArrayCount(i) > 0) { 3796 has_non_marker_interface = true; 3797 break; 3798 } 3799 } 3800 if (!has_non_marker_interface) { 3801 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3802 klass->SetIfTable(super_iftable); 3803 return true; 3804 } 3805 } 3806 StackHandleScope<4> hs(self); 3807 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3808 if (UNLIKELY(iftable.Get() == NULL)) { 3809 CHECK(self->IsExceptionPending()); // OOME. 3810 return false; 3811 } 3812 if (super_ifcount != 0) { 3813 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3814 for (size_t i = 0; i < super_ifcount; i++) { 3815 mirror::Class* super_interface = super_iftable->GetInterface(i); 3816 iftable->SetInterface(i, super_interface); 3817 } 3818 } 3819 // Flatten the interface inheritance hierarchy. 3820 size_t idx = super_ifcount; 3821 for (size_t i = 0; i < num_interfaces; i++) { 3822 mirror::Class* interface = 3823 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3824 interfaces->Get(i); 3825 DCHECK(interface != NULL); 3826 if (!interface->IsInterface()) { 3827 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3828 PrettyDescriptor(klass.Get()).c_str(), 3829 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3830 return false; 3831 } 3832 // Check if interface is already in iftable 3833 bool duplicate = false; 3834 for (size_t j = 0; j < idx; j++) { 3835 mirror::Class* existing_interface = iftable->GetInterface(j); 3836 if (existing_interface == interface) { 3837 duplicate = true; 3838 break; 3839 } 3840 } 3841 if (!duplicate) { 3842 // Add this non-duplicate interface. 3843 iftable->SetInterface(idx++, interface); 3844 // Add this interface's non-duplicate super-interfaces. 3845 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3846 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3847 bool super_duplicate = false; 3848 for (size_t k = 0; k < idx; k++) { 3849 mirror::Class* existing_interface = iftable->GetInterface(k); 3850 if (existing_interface == super_interface) { 3851 super_duplicate = true; 3852 break; 3853 } 3854 } 3855 if (!super_duplicate) { 3856 iftable->SetInterface(idx++, super_interface); 3857 } 3858 } 3859 } 3860 } 3861 // Shrink iftable in case duplicates were found 3862 if (idx < ifcount) { 3863 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3864 if (UNLIKELY(iftable.Get() == NULL)) { 3865 CHECK(self->IsExceptionPending()); // OOME. 3866 return false; 3867 } 3868 ifcount = idx; 3869 } else { 3870 CHECK_EQ(idx, ifcount); 3871 } 3872 klass->SetIfTable(iftable.Get()); 3873 3874 // If we're an interface, we don't need the vtable pointers, so we're done. 3875 if (klass->IsInterface()) { 3876 return true; 3877 } 3878 // Allocate imtable 3879 bool imtable_changed = false; 3880 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3881 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3882 if (UNLIKELY(imtable.Get() == NULL)) { 3883 CHECK(self->IsExceptionPending()); // OOME. 3884 return false; 3885 } 3886 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3887 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3888 std::vector<mirror::ArtMethod*> miranda_list; 3889 for (size_t i = 0; i < ifcount; ++i) { 3890 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3891 if (num_methods > 0) { 3892 StackHandleScope<2> hs(self); 3893 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3894 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3895 if (UNLIKELY(method_array.Get() == nullptr)) { 3896 CHECK(self->IsExceptionPending()); // OOME. 3897 return false; 3898 } 3899 iftable->SetMethodArray(i, method_array.Get()); 3900 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3901 hs.NewHandle(klass->GetVTableDuringLinking())); 3902 for (size_t j = 0; j < num_methods; ++j) { 3903 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3904 interface_mh.ChangeMethod(interface_method); 3905 int32_t k; 3906 // For each method listed in the interface's method list, find the 3907 // matching method in our class's method list. We want to favor the 3908 // subclass over the superclass, which just requires walking 3909 // back from the end of the vtable. (This only matters if the 3910 // superclass defines a private method and this class redefines 3911 // it -- otherwise it would use the same vtable slot. In .dex files 3912 // those don't end up in the virtual method table, so it shouldn't 3913 // matter which direction we go. We walk it backward anyway.) 3914 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3915 mirror::ArtMethod* vtable_method = vtable->Get(k); 3916 vtable_mh.ChangeMethod(vtable_method); 3917 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3918 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3919 ThrowIllegalAccessError( 3920 klass.Get(), 3921 "Method '%s' implementing interface method '%s' is not public", 3922 PrettyMethod(vtable_method).c_str(), 3923 PrettyMethod(interface_method).c_str()); 3924 return false; 3925 } 3926 method_array->Set<false>(j, vtable_method); 3927 // Place method in imt if entry is empty, place conflict otherwise. 3928 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3929 if (imtable->Get(imt_index) == NULL) { 3930 imtable->Set<false>(imt_index, vtable_method); 3931 imtable_changed = true; 3932 } else { 3933 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3934 } 3935 break; 3936 } 3937 } 3938 if (k < 0) { 3939 StackHandleScope<1> hs(self); 3940 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3941 for (mirror::ArtMethod* mir_method : miranda_list) { 3942 vtable_mh.ChangeMethod(mir_method); 3943 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3944 miranda_method.Assign(mir_method); 3945 break; 3946 } 3947 } 3948 if (miranda_method.Get() == NULL) { 3949 // Point the interface table at a phantom slot. 3950 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3951 if (UNLIKELY(miranda_method.Get() == NULL)) { 3952 CHECK(self->IsExceptionPending()); // OOME. 3953 return false; 3954 } 3955 // TODO: If a methods move then the miranda_list may hold stale references. 3956 miranda_list.push_back(miranda_method.Get()); 3957 } 3958 method_array->Set<false>(j, miranda_method.Get()); 3959 } 3960 } 3961 } 3962 } 3963 if (imtable_changed) { 3964 // Fill in empty entries in interface method table with conflict. 3965 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3966 for (size_t i = 0; i < kImtSize; i++) { 3967 if (imtable->Get(i) == NULL) { 3968 imtable->Set<false>(i, imt_conflict_method); 3969 } 3970 } 3971 klass->SetImTable(imtable.Get()); 3972 } 3973 if (!miranda_list.empty()) { 3974 int old_method_count = klass->NumVirtualMethods(); 3975 int new_method_count = old_method_count + miranda_list.size(); 3976 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3977 if (old_method_count == 0) { 3978 virtuals = AllocArtMethodArray(self, new_method_count); 3979 } else { 3980 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3981 } 3982 if (UNLIKELY(virtuals == NULL)) { 3983 CHECK(self->IsExceptionPending()); // OOME. 3984 return false; 3985 } 3986 klass->SetVirtualMethods(virtuals); 3987 3988 StackHandleScope<1> hs(self); 3989 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3990 hs.NewHandle(klass->GetVTableDuringLinking())); 3991 CHECK(vtable.Get() != NULL); 3992 int old_vtable_count = vtable->GetLength(); 3993 int new_vtable_count = old_vtable_count + miranda_list.size(); 3994 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3995 if (UNLIKELY(vtable.Get() == NULL)) { 3996 CHECK(self->IsExceptionPending()); // OOME. 3997 return false; 3998 } 3999 for (size_t i = 0; i < miranda_list.size(); ++i) { 4000 mirror::ArtMethod* method = miranda_list[i]; 4001 // Leave the declaring class alone as type indices are relative to it 4002 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4003 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4004 klass->SetVirtualMethod(old_method_count + i, method); 4005 vtable->Set<false>(old_vtable_count + i, method); 4006 } 4007 // TODO: do not assign to the vtable field until it is fully constructed. 4008 klass->SetVTable(vtable.Get()); 4009 } 4010 4011 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4012 for (int i = 0; i < vtable->GetLength(); ++i) { 4013 CHECK(vtable->Get(i) != NULL); 4014 } 4015 4016// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4017 4018 return true; 4019} 4020 4021bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4022 CHECK(klass.Get() != NULL); 4023 return LinkFields(klass, false); 4024} 4025 4026bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 4027 CHECK(klass.Get() != NULL); 4028 size_t allocated_class_size = klass->GetClassSize(); 4029 bool success = LinkFields(klass, true); 4030 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 4031 return success; 4032} 4033 4034struct LinkFieldsComparator { 4035 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4036 } 4037 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4038 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4039 NO_THREAD_SAFETY_ANALYSIS { 4040 // First come reference fields, then 64-bit, and finally 32-bit 4041 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4042 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4043 if (type1 != type2) { 4044 bool is_primitive1 = type1 != Primitive::kPrimNot; 4045 bool is_primitive2 = type2 != Primitive::kPrimNot; 4046 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4047 type1 == Primitive::kPrimDouble); 4048 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4049 type2 == Primitive::kPrimDouble); 4050 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4051 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4052 if (order1 != order2) { 4053 return order1 < order2; 4054 } 4055 } 4056 // same basic group? then sort by string. 4057 return strcmp(field1->GetName(), field2->GetName()) < 0; 4058 } 4059}; 4060 4061bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 4062 size_t num_fields = 4063 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4064 4065 mirror::ObjectArray<mirror::ArtField>* fields = 4066 is_static ? klass->GetSFields() : klass->GetIFields(); 4067 4068 // Initialize size and field_offset 4069 size_t size; 4070 MemberOffset field_offset(0); 4071 if (is_static) { 4072 size = klass->GetClassSize(); 4073 field_offset = mirror::Class::FieldsOffset(); 4074 } else { 4075 mirror::Class* super_class = klass->GetSuperClass(); 4076 if (super_class != NULL) { 4077 CHECK(super_class->IsResolved()) 4078 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4079 field_offset = MemberOffset(super_class->GetObjectSize()); 4080 } 4081 size = field_offset.Uint32Value(); 4082 } 4083 4084 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4085 4086 // we want a relatively stable order so that adding new fields 4087 // minimizes disruption of C++ version such as Class and Method. 4088 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4089 for (size_t i = 0; i < num_fields; i++) { 4090 mirror::ArtField* f = fields->Get(i); 4091 CHECK(f != NULL) << PrettyClass(klass.Get()); 4092 grouped_and_sorted_fields.push_back(f); 4093 } 4094 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4095 LinkFieldsComparator()); 4096 4097 // References should be at the front. 4098 size_t current_field = 0; 4099 size_t num_reference_fields = 0; 4100 for (; current_field < num_fields; current_field++) { 4101 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4102 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4103 bool isPrimitive = type != Primitive::kPrimNot; 4104 if (isPrimitive) { 4105 break; // past last reference, move on to the next phase 4106 } 4107 grouped_and_sorted_fields.pop_front(); 4108 num_reference_fields++; 4109 fields->Set<false>(current_field, field); 4110 field->SetOffset(field_offset); 4111 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4112 } 4113 4114 // Now we want to pack all of the double-wide fields together. If 4115 // we're not aligned, though, we want to shuffle one 32-bit field 4116 // into place. If we can't find one, we'll have to pad it. 4117 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4118 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4119 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4120 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4121 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4122 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4123 continue; 4124 } 4125 fields->Set<false>(current_field++, field); 4126 field->SetOffset(field_offset); 4127 // drop the consumed field 4128 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4129 break; 4130 } 4131 // whether we found a 32-bit field for padding or not, we advance 4132 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4133 } 4134 4135 // Alignment is good, shuffle any double-wide fields forward, and 4136 // finish assigning field offsets to all fields. 4137 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4138 << PrettyClass(klass.Get()); 4139 while (!grouped_and_sorted_fields.empty()) { 4140 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4141 grouped_and_sorted_fields.pop_front(); 4142 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4143 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4144 fields->Set<false>(current_field, field); 4145 field->SetOffset(field_offset); 4146 field_offset = MemberOffset(field_offset.Uint32Value() + 4147 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4148 ? sizeof(uint64_t) 4149 : sizeof(uint32_t))); 4150 current_field++; 4151 } 4152 4153 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4154 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4155 // We know there are no non-reference fields in the Reference classes, and we know 4156 // that 'referent' is alphabetically last, so this is easy... 4157 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4158 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4159 --num_reference_fields; 4160 } 4161 4162 if (kIsDebugBuild) { 4163 // Make sure that all reference fields appear before 4164 // non-reference fields, and all double-wide fields are aligned. 4165 bool seen_non_ref = false; 4166 for (size_t i = 0; i < num_fields; i++) { 4167 mirror::ArtField* field = fields->Get(i); 4168 if (false) { // enable to debug field layout 4169 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4170 << " class=" << PrettyClass(klass.Get()) 4171 << " field=" << PrettyField(field) 4172 << " offset=" 4173 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4174 } 4175 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4176 bool is_primitive = type != Primitive::kPrimNot; 4177 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4178 strcmp("referent", field->GetName()) == 0) { 4179 is_primitive = true; // We lied above, so we have to expect a lie here. 4180 } 4181 if (is_primitive) { 4182 if (!seen_non_ref) { 4183 seen_non_ref = true; 4184 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4185 } 4186 } else { 4187 DCHECK(!seen_non_ref) << PrettyField(field); 4188 } 4189 } 4190 if (!seen_non_ref) { 4191 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4192 } 4193 } 4194 size = field_offset.Uint32Value(); 4195 // Update klass 4196 if (is_static) { 4197 klass->SetNumReferenceStaticFields(num_reference_fields); 4198 klass->SetClassSize(size); 4199 } else { 4200 klass->SetNumReferenceInstanceFields(num_reference_fields); 4201 if (!klass->IsVariableSize()) { 4202 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4203 size_t previous_size = klass->GetObjectSize(); 4204 if (previous_size != 0) { 4205 // Make sure that we didn't originally have an incorrect size. 4206 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4207 } 4208 klass->SetObjectSize(size); 4209 } 4210 } 4211 return true; 4212} 4213 4214// Set the bitmap of reference offsets, refOffsets, from the ifields 4215// list. 4216void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4217 uint32_t reference_offsets = 0; 4218 mirror::Class* super_class = klass->GetSuperClass(); 4219 if (super_class != NULL) { 4220 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4221 // If our superclass overflowed, we don't stand a chance. 4222 if (reference_offsets == CLASS_WALK_SUPER) { 4223 klass->SetReferenceInstanceOffsets(reference_offsets); 4224 return; 4225 } 4226 } 4227 CreateReferenceOffsets(klass, false, reference_offsets); 4228} 4229 4230void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4231 CreateReferenceOffsets(klass, true, 0); 4232} 4233 4234void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4235 uint32_t reference_offsets) { 4236 size_t num_reference_fields = 4237 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4238 : klass->NumReferenceInstanceFieldsDuringLinking(); 4239 mirror::ObjectArray<mirror::ArtField>* fields = 4240 is_static ? klass->GetSFields() : klass->GetIFields(); 4241 // All of the fields that contain object references are guaranteed 4242 // to be at the beginning of the fields list. 4243 for (size_t i = 0; i < num_reference_fields; ++i) { 4244 // Note that byte_offset is the offset from the beginning of 4245 // object, not the offset into instance data 4246 mirror::ArtField* field = fields->Get(i); 4247 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4248 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4249 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4250 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4251 CHECK_NE(new_bit, 0U); 4252 reference_offsets |= new_bit; 4253 } else { 4254 reference_offsets = CLASS_WALK_SUPER; 4255 break; 4256 } 4257 } 4258 // Update fields in klass 4259 if (is_static) { 4260 klass->SetReferenceStaticOffsets(reference_offsets); 4261 } else { 4262 klass->SetReferenceInstanceOffsets(reference_offsets); 4263 } 4264} 4265 4266mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4267 Handle<mirror::DexCache> dex_cache) { 4268 DCHECK(dex_cache.Get() != nullptr); 4269 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4270 if (resolved != NULL) { 4271 return resolved; 4272 } 4273 uint32_t utf16_length; 4274 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4275 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4276 dex_cache->SetResolvedString(string_idx, string); 4277 return string; 4278} 4279 4280mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4281 mirror::Class* referrer) { 4282 StackHandleScope<2> hs(Thread::Current()); 4283 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4284 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4285 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4286} 4287 4288mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4289 Handle<mirror::DexCache> dex_cache, 4290 Handle<mirror::ClassLoader> class_loader) { 4291 DCHECK(dex_cache.Get() != NULL); 4292 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4293 if (resolved == NULL) { 4294 Thread* self = Thread::Current(); 4295 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4296 resolved = FindClass(self, descriptor, class_loader); 4297 if (resolved != NULL) { 4298 // TODO: we used to throw here if resolved's class loader was not the 4299 // boot class loader. This was to permit different classes with the 4300 // same name to be loaded simultaneously by different loaders 4301 dex_cache->SetResolvedType(type_idx, resolved); 4302 } else { 4303 CHECK(self->IsExceptionPending()) 4304 << "Expected pending exception for failed resolution of: " << descriptor; 4305 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4306 StackHandleScope<1> hs(self); 4307 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4308 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4309 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4310 self->ClearException(); 4311 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4312 self->GetException(NULL)->SetCause(cause.Get()); 4313 } 4314 } 4315 } 4316 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4317 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4318 return resolved; 4319} 4320 4321mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4322 Handle<mirror::DexCache> dex_cache, 4323 Handle<mirror::ClassLoader> class_loader, 4324 Handle<mirror::ArtMethod> referrer, 4325 InvokeType type) { 4326 DCHECK(dex_cache.Get() != NULL); 4327 // Check for hit in the dex cache. 4328 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4329 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4330 return resolved; 4331 } 4332 // Fail, get the declaring class. 4333 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4334 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4335 if (klass == NULL) { 4336 DCHECK(Thread::Current()->IsExceptionPending()); 4337 return NULL; 4338 } 4339 // Scan using method_idx, this saves string compares but will only hit for matching dex 4340 // caches/files. 4341 switch (type) { 4342 case kDirect: // Fall-through. 4343 case kStatic: 4344 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4345 break; 4346 case kInterface: 4347 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4348 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4349 break; 4350 case kSuper: // Fall-through. 4351 case kVirtual: 4352 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4353 break; 4354 default: 4355 LOG(FATAL) << "Unreachable - invocation type: " << type; 4356 } 4357 if (resolved == NULL) { 4358 // Search by name, which works across dex files. 4359 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4360 const Signature signature = dex_file.GetMethodSignature(method_id); 4361 switch (type) { 4362 case kDirect: // Fall-through. 4363 case kStatic: 4364 resolved = klass->FindDirectMethod(name, signature); 4365 break; 4366 case kInterface: 4367 resolved = klass->FindInterfaceMethod(name, signature); 4368 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4369 break; 4370 case kSuper: // Fall-through. 4371 case kVirtual: 4372 resolved = klass->FindVirtualMethod(name, signature); 4373 break; 4374 } 4375 } 4376 if (resolved != NULL) { 4377 // We found a method, check for incompatible class changes. 4378 if (resolved->CheckIncompatibleClassChange(type)) { 4379 resolved = NULL; 4380 } 4381 } 4382 if (resolved != NULL) { 4383 // Be a good citizen and update the dex cache to speed subsequent calls. 4384 dex_cache->SetResolvedMethod(method_idx, resolved); 4385 return resolved; 4386 } else { 4387 // We failed to find the method which means either an access error, an incompatible class 4388 // change, or no such method. First try to find the method among direct and virtual methods. 4389 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4390 const Signature signature = dex_file.GetMethodSignature(method_id); 4391 switch (type) { 4392 case kDirect: 4393 case kStatic: 4394 resolved = klass->FindVirtualMethod(name, signature); 4395 break; 4396 case kInterface: 4397 case kVirtual: 4398 case kSuper: 4399 resolved = klass->FindDirectMethod(name, signature); 4400 break; 4401 } 4402 4403 // If we found something, check that it can be accessed by the referrer. 4404 if (resolved != NULL && referrer.Get() != NULL) { 4405 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4406 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4407 if (!referring_class->CanAccess(methods_class)) { 4408 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4409 resolved, type); 4410 return NULL; 4411 } else if (!referring_class->CanAccessMember(methods_class, 4412 resolved->GetAccessFlags())) { 4413 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4414 return NULL; 4415 } 4416 } 4417 4418 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4419 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4420 switch (type) { 4421 case kDirect: 4422 case kStatic: 4423 if (resolved != NULL) { 4424 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4425 } else { 4426 resolved = klass->FindInterfaceMethod(name, signature); 4427 if (resolved != NULL) { 4428 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4429 } else { 4430 ThrowNoSuchMethodError(type, klass, name, signature); 4431 } 4432 } 4433 break; 4434 case kInterface: 4435 if (resolved != NULL) { 4436 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4437 } else { 4438 resolved = klass->FindVirtualMethod(name, signature); 4439 if (resolved != NULL) { 4440 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4441 } else { 4442 ThrowNoSuchMethodError(type, klass, name, signature); 4443 } 4444 } 4445 break; 4446 case kSuper: 4447 ThrowNoSuchMethodError(type, klass, name, signature); 4448 break; 4449 case kVirtual: 4450 if (resolved != NULL) { 4451 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4452 } else { 4453 resolved = klass->FindInterfaceMethod(name, signature); 4454 if (resolved != NULL) { 4455 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4456 } else { 4457 ThrowNoSuchMethodError(type, klass, name, signature); 4458 } 4459 } 4460 break; 4461 } 4462 DCHECK(Thread::Current()->IsExceptionPending()); 4463 return NULL; 4464 } 4465} 4466 4467mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4468 Handle<mirror::DexCache> dex_cache, 4469 Handle<mirror::ClassLoader> class_loader, 4470 bool is_static) { 4471 DCHECK(dex_cache.Get() != nullptr); 4472 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4473 if (resolved != NULL) { 4474 return resolved; 4475 } 4476 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4477 Thread* const self = Thread::Current(); 4478 StackHandleScope<1> hs(self); 4479 Handle<mirror::Class> klass( 4480 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4481 if (klass.Get() == NULL) { 4482 DCHECK(Thread::Current()->IsExceptionPending()); 4483 return NULL; 4484 } 4485 4486 if (is_static) { 4487 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4488 } else { 4489 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4490 } 4491 4492 if (resolved == NULL) { 4493 const char* name = dex_file.GetFieldName(field_id); 4494 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4495 if (is_static) { 4496 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4497 } else { 4498 resolved = klass->FindInstanceField(name, type); 4499 } 4500 if (resolved == NULL) { 4501 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4502 return NULL; 4503 } 4504 } 4505 dex_cache->SetResolvedField(field_idx, resolved); 4506 return resolved; 4507} 4508 4509mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4510 uint32_t field_idx, 4511 Handle<mirror::DexCache> dex_cache, 4512 Handle<mirror::ClassLoader> class_loader) { 4513 DCHECK(dex_cache.Get() != nullptr); 4514 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4515 if (resolved != NULL) { 4516 return resolved; 4517 } 4518 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4519 Thread* self = Thread::Current(); 4520 StackHandleScope<1> hs(self); 4521 Handle<mirror::Class> klass( 4522 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4523 if (klass.Get() == NULL) { 4524 DCHECK(Thread::Current()->IsExceptionPending()); 4525 return NULL; 4526 } 4527 4528 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4529 StringPiece type(dex_file.StringDataByIdx( 4530 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4531 resolved = mirror::Class::FindField(self, klass, name, type); 4532 if (resolved != NULL) { 4533 dex_cache->SetResolvedField(field_idx, resolved); 4534 } else { 4535 ThrowNoSuchFieldError("", klass.Get(), type, name); 4536 } 4537 return resolved; 4538} 4539 4540const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4541 uint32_t* length) { 4542 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4543 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4544 const DexFile& dex_file = *dex_cache->GetDexFile(); 4545 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4546 return dex_file.GetMethodShorty(method_id, length); 4547} 4548 4549void ClassLinker::DumpAllClasses(int flags) { 4550 if (dex_cache_image_class_lookup_required_) { 4551 MoveImageClassesToClassTable(); 4552 } 4553 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4554 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4555 std::vector<mirror::Class*> all_classes; 4556 { 4557 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4558 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4559 mirror::Class** root = &it.second; 4560 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4561 all_classes.push_back(klass); 4562 } 4563 } 4564 4565 for (size_t i = 0; i < all_classes.size(); ++i) { 4566 all_classes[i]->DumpClass(std::cerr, flags); 4567 } 4568} 4569 4570void ClassLinker::DumpForSigQuit(std::ostream& os) { 4571 if (dex_cache_image_class_lookup_required_) { 4572 MoveImageClassesToClassTable(); 4573 } 4574 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4575 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4576} 4577 4578size_t ClassLinker::NumLoadedClasses() { 4579 if (dex_cache_image_class_lookup_required_) { 4580 MoveImageClassesToClassTable(); 4581 } 4582 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4583 return class_table_.size(); 4584} 4585 4586pid_t ClassLinker::GetClassesLockOwner() { 4587 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4588} 4589 4590pid_t ClassLinker::GetDexLockOwner() { 4591 return dex_lock_.GetExclusiveOwnerTid(); 4592} 4593 4594void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4595 DCHECK(!init_done_); 4596 4597 DCHECK(klass != NULL); 4598 DCHECK(klass->GetClassLoader() == NULL); 4599 4600 mirror::ObjectArray<mirror::Class>* class_roots = 4601 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4602 &class_roots_); 4603 DCHECK(class_roots != NULL); 4604 DCHECK(class_roots->Get(class_root) == NULL); 4605 class_roots->Set<false>(class_root, klass); 4606} 4607 4608} // namespace art 4609