class_linker.cc revision 2da882315a61072664f7ce3c212307342e907207
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 23#include <deque> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "oat.h" 44#include "oat_file.h" 45#include "mirror/art_field-inl.h" 46#include "mirror/art_method-inl.h" 47#include "mirror/class.h" 48#include "mirror/class-inl.h" 49#include "mirror/class_loader.h" 50#include "mirror/dex_cache-inl.h" 51#include "mirror/iftable-inl.h" 52#include "mirror/object-inl.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/proxy.h" 55#include "mirror/stack_trace_element.h" 56#include "object_utils.h" 57#include "os.h" 58#include "runtime.h" 59#include "entrypoints/entrypoint_utils.h" 60#include "ScopedLocalRef.h" 61#include "scoped_thread_state_change.h" 62#include "sirt_ref.h" 63#include "stack_indirect_reference_table.h" 64#include "thread.h" 65#include "UniquePtr.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 ClassHelper ve_ch(c->GetVerifyErrorClass()); 100 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), 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 dex_caches_dirty_(false), 182 class_table_dirty_(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 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 191} 192 193void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 194 VLOG(startup) << "ClassLinker::Init"; 195 CHECK(Runtime::Current()->IsCompiler()); 196 197 CHECK(!init_done_); 198 199 // java_lang_Class comes first, it's needed for AllocClass 200 Thread* self = Thread::Current(); 201 gc::Heap* heap = Runtime::Current()->GetHeap(); 202 // The GC can't handle an object with a null class since we can't get the size of this object. 203 heap->IncrementDisableMovingGC(self); 204 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 205 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 206 CHECK(java_lang_Class.get() != NULL); 207 mirror::Class::SetClassClass(java_lang_Class.get()); 208 java_lang_Class->SetClass(java_lang_Class.get()); 209 if (kUseBrooksPointer) { 210 java_lang_Class->AssertSelfBrooksPointer(); 211 } 212 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 213 heap->DecrementDisableMovingGC(self); 214 // AllocClass(mirror::Class*) can now be used 215 216 // Class[] is used for reflection support. 217 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 218 class_array_class->SetComponentType(java_lang_Class.get()); 219 220 // java_lang_Object comes next so that object_array_class can be created. 221 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 222 CHECK(java_lang_Object.get() != NULL); 223 // backfill Object as the super class of Class. 224 java_lang_Class->SetSuperClass(java_lang_Object.get()); 225 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 226 227 // Object[] next to hold class roots. 228 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 229 object_array_class->SetComponentType(java_lang_Object.get()); 230 231 // Setup the char class to be used for char[]. 232 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 233 234 // Setup the char[] class to be used for String. 235 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 char_array_class->SetComponentType(char_class.get()); 237 mirror::CharArray::SetArrayClass(char_array_class.get()); 238 239 // Setup String. 240 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 241 mirror::String::SetClass(java_lang_String.get()); 242 java_lang_String->SetObjectSize(sizeof(mirror::String)); 243 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 244 245 // Create storage for root classes, save away our work so far (requires descriptors). 246 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 247 kClassRootsMax); 248 CHECK(class_roots_ != NULL); 249 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 250 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 251 SetClassRoot(kClassArrayClass, class_array_class.get()); 252 SetClassRoot(kObjectArrayClass, object_array_class.get()); 253 SetClassRoot(kCharArrayClass, char_array_class.get()); 254 SetClassRoot(kJavaLangString, java_lang_String.get()); 255 256 // Setup the primitive type classes. 257 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 258 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 259 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 260 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 261 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 262 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 263 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 264 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 265 266 // Create array interface entries to populate once we can load system classes. 267 array_iftable_ = AllocIfTable(self, 2); 268 269 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 270 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 271 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 272 mirror::IntArray::SetArrayClass(int_array_class.get()); 273 SetClassRoot(kIntArrayClass, int_array_class.get()); 274 275 // now that these are registered, we can use AllocClass() and AllocObjectArray 276 277 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 278 SirtRef<mirror::Class> 279 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 280 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 281 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 282 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 283 284 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 285 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 286 sizeof(mirror::ArtFieldClass))); 287 CHECK(java_lang_reflect_ArtField.get() != NULL); 288 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 289 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 290 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 291 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 292 293 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 294 sizeof(mirror::ArtMethodClass))); 295 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 296 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 297 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 298 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 299 300 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 301 302 // Set up array classes for string, field, method 303 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 304 sizeof(mirror::Class))); 305 object_array_string->SetComponentType(java_lang_String.get()); 306 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 307 308 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 309 sizeof(mirror::Class))); 310 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 311 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 312 313 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 314 sizeof(mirror::Class))); 315 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 316 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 317 318 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 319 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 320 // these roots. 321 CHECK_NE(0U, boot_class_path.size()); 322 for (size_t i = 0; i != boot_class_path.size(); ++i) { 323 const DexFile* dex_file = boot_class_path[i]; 324 CHECK(dex_file != NULL); 325 AppendToBootClassPath(*dex_file); 326 } 327 328 // now we can use FindSystemClass 329 330 // run char class through InitializePrimitiveClass to finish init 331 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 332 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 333 334 // Create runtime resolution and imt conflict methods. Also setup the default imt. 335 Runtime* runtime = Runtime::Current(); 336 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 337 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 338 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 339 340 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 341 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 342 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 343 CHECK_EQ(java_lang_Object.get(), Object_class); 344 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 345 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 346 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 349 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 350 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 351 CHECK_EQ(java_lang_String.get(), String_class); 352 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 353 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 354 355 // Setup the primitive array type classes - can't be done until Object has a vtable. 356 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 357 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 358 359 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 360 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 361 362 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 363 CHECK_EQ(char_array_class.get(), found_char_array_class); 364 365 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 366 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 367 368 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 369 CHECK_EQ(int_array_class.get(), found_int_array_class); 370 371 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 372 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 373 374 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 375 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 376 377 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 378 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 379 380 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 381 CHECK_EQ(class_array_class.get(), found_class_array_class); 382 383 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 384 CHECK_EQ(object_array_class.get(), found_object_array_class); 385 386 // Setup the single, global copy of "iftable". 387 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 388 CHECK(java_lang_Cloneable != NULL); 389 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 390 CHECK(java_io_Serializable != NULL); 391 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 392 // crawl up and explicitly list all of the supers as well. 393 array_iftable_->SetInterface(0, java_lang_Cloneable); 394 array_iftable_->SetInterface(1, java_io_Serializable); 395 396 // Sanity check Class[] and Object[]'s interfaces. 397 ClassHelper kh(class_array_class.get()); 398 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 399 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 400 kh.ChangeClass(object_array_class.get()); 401 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 402 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 403 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 404 // dex_cache_ fields and register them in class_table_. 405 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 406 CHECK_EQ(java_lang_Class.get(), Class_class); 407 408 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 409 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 410 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 411 412 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 413 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 414 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 415 416 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 417 CHECK_EQ(object_array_string.get(), String_array_class); 418 419 mirror::Class* Art_method_array_class = 420 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 421 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 422 423 mirror::Class* Art_field_array_class = 424 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 425 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 426 427 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 428 429 // Create java.lang.reflect.Proxy root. 430 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 431 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 432 433 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 434 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 435 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 436 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 437 java_lang_ref_FinalizerReference->SetAccessFlags( 438 java_lang_ref_FinalizerReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsFinalizerReference); 440 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 441 java_lang_ref_PhantomReference->SetAccessFlags( 442 java_lang_ref_PhantomReference->GetAccessFlags() | 443 kAccClassIsReference | kAccClassIsPhantomReference); 444 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 445 java_lang_ref_SoftReference->SetAccessFlags( 446 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 447 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 448 java_lang_ref_WeakReference->SetAccessFlags( 449 java_lang_ref_WeakReference->GetAccessFlags() | 450 kAccClassIsReference | kAccClassIsWeakReference); 451 452 // Setup the ClassLoader, verifying the object_size_. 453 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 454 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 455 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 456 457 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 458 // java.lang.StackTraceElement as a convenience. 459 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 460 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 461 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 462 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 463 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 464 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 465 466 FinishInit(self); 467 468 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 469} 470 471void ClassLinker::FinishInit(Thread* self) { 472 VLOG(startup) << "ClassLinker::FinishInit entering"; 473 474 // Let the heap know some key offsets into java.lang.ref instances 475 // Note: we hard code the field indexes here rather than using FindInstanceField 476 // as the types of the field can't be resolved prior to the runtime being 477 // fully initialized 478 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 482 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 483 FieldHelper fh(pendingNext); 484 CHECK_STREQ(fh.GetName(), "pendingNext"); 485 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 486 487 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 488 fh.ChangeField(queue); 489 CHECK_STREQ(fh.GetName(), "queue"); 490 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 491 492 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 493 fh.ChangeField(queueNext); 494 CHECK_STREQ(fh.GetName(), "queueNext"); 495 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 496 497 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 498 fh.ChangeField(referent); 499 CHECK_STREQ(fh.GetName(), "referent"); 500 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 501 502 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 503 fh.ChangeField(zombie); 504 CHECK_STREQ(fh.GetName(), "zombie"); 505 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 506 507 gc::Heap* heap = Runtime::Current()->GetHeap(); 508 heap->SetReferenceOffsets(referent->GetOffset(), 509 queue->GetOffset(), 510 queueNext->GetOffset(), 511 pendingNext->GetOffset(), 512 zombie->GetOffset()); 513 514 // ensure all class_roots_ are initialized 515 for (size_t i = 0; i < kClassRootsMax; i++) { 516 ClassRoot class_root = static_cast<ClassRoot>(i); 517 mirror::Class* klass = GetClassRoot(class_root); 518 CHECK(klass != NULL); 519 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 520 // note SetClassRoot does additional validation. 521 // if possible add new checks there to catch errors early 522 } 523 524 CHECK(array_iftable_ != NULL); 525 526 // disable the slow paths in FindClass and CreatePrimitiveClass now 527 // that Object, Class, and Object[] are setup 528 init_done_ = true; 529 530 VLOG(startup) << "ClassLinker::FinishInit exiting"; 531} 532 533void ClassLinker::RunRootClinits() { 534 Thread* self = Thread::Current(); 535 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 536 mirror::Class* c = GetClassRoot(ClassRoot(i)); 537 if (!c->IsArrayClass() && !c->IsPrimitive()) { 538 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 539 EnsureInitialized(sirt_class, true, true); 540 self->AssertNoPendingException(); 541 } 542 } 543} 544 545bool ClassLinker::GenerateOatFile(const char* dex_filename, 546 int oat_fd, 547 const char* oat_cache_filename, 548 std::string* error_msg) { 549 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 550 std::string dex2oat(GetAndroidRoot()); 551 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 552 553 gc::Heap* heap = Runtime::Current()->GetHeap(); 554 std::string boot_image_option("--boot-image="); 555 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 556 557 std::string dex_file_option("--dex-file="); 558 dex_file_option += dex_filename; 559 560 std::string oat_fd_option("--oat-fd="); 561 StringAppendF(&oat_fd_option, "%d", oat_fd); 562 563 std::string oat_location_option("--oat-location="); 564 oat_location_option += oat_cache_filename; 565 566 std::vector<std::string> argv; 567 argv.push_back(dex2oat); 568 argv.push_back("--runtime-arg"); 569 argv.push_back("-Xms64m"); 570 argv.push_back("--runtime-arg"); 571 argv.push_back("-Xmx64m"); 572 argv.push_back("--runtime-arg"); 573 argv.push_back("-classpath"); 574 argv.push_back("--runtime-arg"); 575 argv.push_back(Runtime::Current()->GetClassPathString()); 576 if (!kIsTargetBuild) { 577 argv.push_back("--host"); 578 } 579 argv.push_back(boot_image_option); 580 argv.push_back(dex_file_option); 581 argv.push_back(oat_fd_option); 582 argv.push_back(oat_location_option); 583 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 584 for (size_t i = 0; compiler_options.size(); ++i) { 585 argv.push_back(compiler_options[i].c_str()); 586 } 587 588 return Exec(argv, error_msg); 589} 590 591const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 592 WriterMutexLock mu(Thread::Current(), dex_lock_); 593 if (kIsDebugBuild) { 594 for (size_t i = 0; i < oat_files_.size(); ++i) { 595 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 596 } 597 } 598 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 599 oat_files_.push_back(oat_file); 600 return oat_file; 601} 602 603OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 604 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 605 OatFile* oat_file = space->ReleaseOatFile(); 606 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 607 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 608 return *oat_file; 609} 610 611const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 612 const char* dex_location = dex_file.GetLocation().c_str(); 613 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 614 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 615} 616 617const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 618 const uint32_t* const dex_location_checksum) { 619 ReaderMutexLock mu(Thread::Current(), dex_lock_); 620 for (size_t i = 0; i < oat_files_.size(); i++) { 621 const OatFile* oat_file = oat_files_[i]; 622 DCHECK(oat_file != NULL); 623 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 624 dex_location_checksum, 625 false); 626 if (oat_dex_file != NULL) { 627 return oat_file; 628 } 629 } 630 return NULL; 631} 632 633const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 634 uint32_t dex_location_checksum, 635 const char* oat_location, 636 std::string* error_msg) { 637 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 638 !Runtime::Current()->IsCompiler(), 639 error_msg)); 640 if (oat_file.get() == nullptr) { 641 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 642 error_msg->c_str()); 643 return nullptr; 644 } 645 Runtime* runtime = Runtime::Current(); 646 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 647 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 648 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 649 if (expected_image_oat_checksum != actual_image_oat_checksum) { 650 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 651 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 652 actual_image_oat_checksum); 653 return nullptr; 654 } 655 656 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 657 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 658 if (expected_image_oat_offset != actual_image_oat_offset) { 659 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 660 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 661 actual_image_oat_offset); 662 return nullptr; 663 } 664 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 665 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 666 // the oat file. 667 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 668 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 669 &dex_location_checksum); 670 if (oat_dex_file == nullptr) { 671 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 672 dex_location); 673 return nullptr; 674 } 675 uint32_t expected_dex_checksum = dex_location_checksum; 676 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 677 if (expected_dex_checksum != actual_dex_checksum) { 678 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 679 "found 0x%x", oat_location, expected_dex_checksum, 680 actual_dex_checksum); 681 return nullptr; 682 } 683 return oat_dex_file->OpenDexFile(error_msg); 684} 685 686class ScopedFlock { 687 public: 688 ScopedFlock() {} 689 690 bool Init(const char* filename, std::string* error_msg) { 691 while (true) { 692 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 693 if (file_.get() == NULL) { 694 *error_msg = StringPrintf("Failed to open file '%s'", filename); 695 return false; 696 } 697 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 698 if (flock_result != 0) { 699 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 700 return false; 701 } 702 struct stat fstat_stat; 703 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 704 if (fstat_result != 0) { 705 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 706 return false; 707 } 708 struct stat stat_stat; 709 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 710 if (stat_result != 0) { 711 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 712 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 713 continue; 714 } 715 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 716 LOG(WARNING) << "File changed while locking, will retry: " << filename; 717 continue; 718 } 719 return true; 720 } 721 } 722 723 File& GetFile() { 724 return *file_; 725 } 726 727 ~ScopedFlock() { 728 if (file_.get() != NULL) { 729 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 730 CHECK_EQ(0, flock_result); 731 } 732 } 733 734 private: 735 UniquePtr<File> file_; 736 737 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 738}; 739 740const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 741 uint32_t dex_location_checksum, 742 const char* oat_location, 743 std::string* error_msg) { 744 // We play a locking game here so that if two different processes 745 // race to generate (or worse, one tries to open a partial generated 746 // file) we will be okay. This is actually common with apps that use 747 // DexClassLoader to work around the dex method reference limit and 748 // that have a background service running in a separate process. 749 ScopedFlock scoped_flock; 750 if (!scoped_flock.Init(oat_location, error_msg)) { 751 return nullptr; 752 } 753 754 // Check if we already have an up-to-date output file 755 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 756 oat_location, error_msg); 757 if (dex_file != nullptr) { 758 return dex_file; 759 } 760 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 761 << oat_location << "': " << *error_msg; 762 error_msg->clear(); 763 764 // Generate the output oat file for the dex file 765 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 766 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 767 CHECK(!error_msg->empty()); 768 return nullptr; 769 } 770 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 771 !Runtime::Current()->IsCompiler(), 772 error_msg); 773 if (oat_file == nullptr) { 774 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 775 oat_location, error_msg->c_str()); 776 return nullptr; 777 } 778 oat_file = RegisterOatFile(oat_file); 779 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 780 &dex_location_checksum); 781 if (oat_dex_file == nullptr) { 782 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 783 "'%s'", dex_location, dex_location_checksum, oat_location); 784 return nullptr; 785 } 786 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 787 CHECK(result != nullptr) << *error_msg; 788 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 789 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 790 << " dex_location_checksum=" << dex_location_checksum 791 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 792 return result; 793} 794 795bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 796 const char* dex_location, 797 uint32_t dex_location_checksum, 798 std::string* error_msg) { 799 Runtime* runtime = Runtime::Current(); 800 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 801 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 802 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 803 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 804 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 805 806 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 807 if (oat_dex_file == NULL) { 808 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 809 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 810 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 811 for (size_t i = 0; i < oat_dex_files.size(); i++) { 812 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 813 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 814 oat_file->GetLocation().c_str(), 815 oat_dex_file->GetDexFileLocation().c_str()); 816 } 817 return false; 818 } 819 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 820 821 if (image_check && dex_check) { 822 return true; 823 } 824 825 if (!image_check) { 826 ScopedObjectAccess soa(Thread::Current()); 827 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 828 std::string image_file(oat_location->ToModifiedUtf8()); 829 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %" PRIdPTR ")", 830 oat_file->GetLocation().c_str(), 831 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 832 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 833 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 834 } 835 if (!dex_check) { 836 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 837 oat_file->GetLocation().c_str(), 838 oat_dex_file->GetDexFileLocationChecksum(), 839 dex_location, dex_location_checksum); 840 } 841 return false; 842} 843 844const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 845 const char* dex_location, 846 std::string* error_msg, 847 bool* open_failed) { 848 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 849 if (oat_file.get() == nullptr) { 850 *open_failed = true; 851 return nullptr; 852 } 853 *open_failed = false; 854 uint32_t dex_location_checksum; 855 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 856 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 857 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 858 // directory. 859 const OatFile* opened_oat_file = oat_file.release(); 860 opened_oat_file = RegisterOatFile(opened_oat_file); 861 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 862 if (oat_dex_file == nullptr) { 863 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 864 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 865 error_msg->c_str()); 866 return nullptr; 867 } 868 return oat_dex_file->OpenDexFile(error_msg); 869 } 870 871 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 872 error_msg); 873 if (!verified) { 874 return nullptr; 875 } 876 const OatFile* opened_oat_file = oat_file.release(); 877 opened_oat_file = RegisterOatFile(opened_oat_file); 878 return opened_oat_file->GetOatDexFile(dex_location, 879 &dex_location_checksum)->OpenDexFile(error_msg); 880} 881 882const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 883 const uint32_t* const dex_location_checksum, 884 std::string* error_msg) { 885 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 886 dex_location_checksum); 887 if (open_oat_file != nullptr) { 888 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 889 dex_location_checksum); 890 return oat_dex_file->OpenDexFile(error_msg); 891 } 892 893 // Look for an existing file next to dex. for example, for 894 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 895 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 896 bool open_failed; 897 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 898 error_msg, &open_failed); 899 if (dex_file != nullptr) { 900 return dex_file; 901 } 902 if (dex_location_checksum == nullptr) { 903 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 904 odex_filename.c_str(), dex_location, error_msg->c_str()); 905 return nullptr; 906 } 907 908 std::string cache_error_msg; 909 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 910 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 911 &open_failed); 912 if (dex_file != nullptr) { 913 return dex_file; 914 } 915 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 916 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 917 } 918 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 919 << " (error '" << *error_msg << "') or " << cache_location 920 << " (error '" << cache_error_msg << "')."; 921 922 // Try to generate oat file if it wasn't found or was obsolete. 923 error_msg->clear(); 924 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 925 cache_location.c_str(), error_msg); 926} 927 928const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 929 ReaderMutexLock mu(Thread::Current(), dex_lock_); 930 for (size_t i = 0; i < oat_files_.size(); i++) { 931 const OatFile* oat_file = oat_files_[i]; 932 DCHECK(oat_file != nullptr); 933 if (oat_file->GetLocation() == oat_location) { 934 return oat_file; 935 } 936 } 937 return nullptr; 938} 939 940const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 941 std::string* error_msg) { 942 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 943 if (oat_file != nullptr) { 944 return oat_file; 945 } 946 947 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 948 error_msg); 949 if (oat_file == NULL) { 950 return NULL; 951 } 952 return oat_file; 953} 954 955static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 956 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 957 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 958 959 DCHECK(obj != NULL); 960 DCHECK(class_linker != NULL); 961 962 if (obj->IsArtMethod()) { 963 mirror::ArtMethod* method = obj->AsArtMethod(); 964 if (!method->IsNative()) { 965 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 966 if (method != Runtime::Current()->GetResolutionMethod()) { 967 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 968 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 969 } 970 } 971 } 972} 973 974void ClassLinker::InitFromImage() { 975 VLOG(startup) << "ClassLinker::InitFromImage entering"; 976 CHECK(!init_done_); 977 978 Thread* self = Thread::Current(); 979 gc::Heap* heap = Runtime::Current()->GetHeap(); 980 gc::space::ImageSpace* space = heap->GetImageSpace(); 981 dex_cache_image_class_lookup_required_ = true; 982 CHECK(space != NULL); 983 OatFile& oat_file = GetImageOatFile(space); 984 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 985 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 986 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 987 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 988 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 989 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 990 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 991 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 992 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 993 mirror::ObjectArray<mirror::DexCache>* dex_caches = 994 dex_caches_object->AsObjectArray<mirror::DexCache>(); 995 996 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 997 self, 998 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 999 class_roots_ = class_roots.get(); 1000 1001 // Special case of setting up the String class early so that we can test arbitrary objects 1002 // as being Strings or not 1003 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1004 1005 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1006 static_cast<uint32_t>(dex_caches->GetLength())); 1007 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1008 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1009 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1010 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1011 nullptr); 1012 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1013 std::string error_msg; 1014 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1015 if (dex_file == NULL) { 1016 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1017 << " from within oat file " << oat_file.GetLocation() 1018 << " error '" << error_msg << "'"; 1019 } 1020 1021 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1022 1023 AppendToBootClassPath(*dex_file, dex_cache); 1024 } 1025 1026 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1027 // bitmap walk. 1028 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1029 1030 // Set entry point to interpreter if in InterpretOnly mode. 1031 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1032 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1033 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1034 } 1035 1036 // reinit class_roots_ 1037 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1038 class_roots_ = class_roots.get(); 1039 1040 // reinit array_iftable_ from any array class instance, they should be == 1041 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1042 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1043 // String class root was set above 1044 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1045 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1046 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1047 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1048 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1049 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1050 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1051 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1052 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1053 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1054 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1055 1056 FinishInit(self); 1057 1058 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1059} 1060 1061// Keep in sync with InitCallback. Anything we visit, we need to 1062// reinit references to when reinitializing a ClassLinker from a 1063// mapped image. 1064void ClassLinker::VisitRoots(RootCallback* callback, void* arg, bool only_dirty, bool clean_dirty) { 1065 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1066 Thread* self = Thread::Current(); 1067 { 1068 ReaderMutexLock mu(self, dex_lock_); 1069 if (!only_dirty || dex_caches_dirty_) { 1070 for (mirror::DexCache*& dex_cache : dex_caches_) { 1071 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1072 DCHECK(dex_cache != nullptr); 1073 } 1074 if (clean_dirty) { 1075 dex_caches_dirty_ = false; 1076 } 1077 } 1078 } 1079 { 1080 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1081 if (!only_dirty || class_table_dirty_) { 1082 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1083 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1084 DCHECK(it.second != nullptr); 1085 } 1086 if (clean_dirty) { 1087 class_table_dirty_ = false; 1088 } 1089 } 1090 // We deliberately ignore the class roots in the image since we 1091 // handle image roots by using the MS/CMS rescanning of dirty cards. 1092 } 1093 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1094 DCHECK(array_iftable_ != nullptr); 1095 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1096 if (find_array_class_cache_[i] != nullptr) { 1097 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1098 kRootVMInternal); 1099 DCHECK(find_array_class_cache_[i] != nullptr); 1100 } 1101 } 1102} 1103 1104void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1105 if (dex_cache_image_class_lookup_required_) { 1106 MoveImageClassesToClassTable(); 1107 } 1108 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1109 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1110 if (!visitor(it.second, arg)) { 1111 return; 1112 } 1113 } 1114} 1115 1116static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1117 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1118 classes->insert(c); 1119 return true; 1120} 1121 1122void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1123 std::set<mirror::Class*> classes; 1124 VisitClasses(GetClassesVisitor, &classes); 1125 for (mirror::Class* klass : classes) { 1126 if (!visitor(klass, arg)) { 1127 return; 1128 } 1129 } 1130} 1131 1132ClassLinker::~ClassLinker() { 1133 mirror::Class::ResetClass(); 1134 mirror::String::ResetClass(); 1135 mirror::ArtField::ResetClass(); 1136 mirror::ArtMethod::ResetClass(); 1137 mirror::BooleanArray::ResetArrayClass(); 1138 mirror::ByteArray::ResetArrayClass(); 1139 mirror::CharArray::ResetArrayClass(); 1140 mirror::DoubleArray::ResetArrayClass(); 1141 mirror::FloatArray::ResetArrayClass(); 1142 mirror::IntArray::ResetArrayClass(); 1143 mirror::LongArray::ResetArrayClass(); 1144 mirror::ShortArray::ResetArrayClass(); 1145 mirror::Throwable::ResetClass(); 1146 mirror::StackTraceElement::ResetClass(); 1147 STLDeleteElements(&boot_class_path_); 1148 STLDeleteElements(&oat_files_); 1149} 1150 1151mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1152 gc::Heap* heap = Runtime::Current()->GetHeap(); 1153 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1154 SirtRef<mirror::DexCache> dex_cache( 1155 self, down_cast<mirror::DexCache*>( 1156 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1157 if (dex_cache.get() == NULL) { 1158 return NULL; 1159 } 1160 SirtRef<mirror::String> 1161 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1162 if (location.get() == NULL) { 1163 return NULL; 1164 } 1165 SirtRef<mirror::ObjectArray<mirror::String> > 1166 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1167 if (strings.get() == NULL) { 1168 return NULL; 1169 } 1170 SirtRef<mirror::ObjectArray<mirror::Class> > 1171 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1172 if (types.get() == NULL) { 1173 return NULL; 1174 } 1175 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1176 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1177 if (methods.get() == NULL) { 1178 return NULL; 1179 } 1180 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1181 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1182 if (fields.get() == NULL) { 1183 return NULL; 1184 } 1185 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1186 fields.get()); 1187 return dex_cache.get(); 1188} 1189 1190// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1191// fence. 1192class InitializeClassVisitor { 1193 public: 1194 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1195 } 1196 1197 void operator()(mirror::Object* obj, size_t usable_size) const 1198 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1199 DCHECK_LE(class_size_, usable_size); 1200 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1201 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1202 // DCHECK(klass->IsClass()); 1203 klass->SetClassSize(class_size_); 1204 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1205 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1206 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1207 } 1208 1209 private: 1210 const uint32_t class_size_; 1211 1212 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1213}; 1214 1215mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1216 uint32_t class_size) { 1217 DCHECK_GE(class_size, sizeof(mirror::Class)); 1218 gc::Heap* heap = Runtime::Current()->GetHeap(); 1219 InitializeClassVisitor visitor(class_size); 1220 mirror::Object* k = 1221 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1222 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1223 if (UNLIKELY(k == nullptr)) { 1224 CHECK(self->IsExceptionPending()); // OOME. 1225 return nullptr; 1226 } 1227 return k->AsClass(); 1228} 1229 1230mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1231 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1232} 1233 1234mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1235 return down_cast<mirror::ArtField*>( 1236 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1237} 1238 1239mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1240 return down_cast<mirror::ArtMethod*>( 1241 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1242} 1243 1244mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1245 Thread* self, size_t length) { 1246 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1247 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1248} 1249 1250static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1251 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1252 DCHECK(klass != NULL); 1253 // Wait for the class if it has not already been linked. 1254 if (!klass->IsResolved() && !klass->IsErroneous()) { 1255 SirtRef<mirror::Class> sirt_class(self, klass); 1256 ObjectLock<mirror::Class> lock(self, &sirt_class); 1257 // Check for circular dependencies between classes. 1258 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1259 ThrowClassCircularityError(sirt_class.get()); 1260 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1261 return nullptr; 1262 } 1263 // Wait for the pending initialization to complete. 1264 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1265 lock.WaitIgnoringInterrupts(); 1266 } 1267 klass = sirt_class.get(); 1268 } 1269 if (klass->IsErroneous()) { 1270 ThrowEarlierClassFailure(klass); 1271 return nullptr; 1272 } 1273 // Return the loaded class. No exceptions should be pending. 1274 CHECK(klass->IsResolved()) << PrettyClass(klass); 1275 self->AssertNoPendingException(); 1276 return klass; 1277} 1278 1279mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1280 const SirtRef<mirror::ClassLoader>& class_loader) { 1281 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1282 DCHECK(self != nullptr); 1283 self->AssertNoPendingException(); 1284 if (descriptor[1] == '\0') { 1285 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1286 // for primitive classes that aren't backed by dex files. 1287 return FindPrimitiveClass(descriptor[0]); 1288 } 1289 // Find the class in the loaded classes table. 1290 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1291 if (klass != NULL) { 1292 return EnsureResolved(self, klass); 1293 } 1294 // Class is not yet loaded. 1295 if (descriptor[0] == '[') { 1296 return CreateArrayClass(self, descriptor, class_loader); 1297 } else if (class_loader.get() == nullptr) { 1298 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1299 if (pair.second != NULL) { 1300 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1301 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1302 } 1303 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1304 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1305 // throw of a NoClassDefFoundError. 1306 if (IsInBootClassPath(descriptor)) { 1307 mirror::Class* system_class = FindSystemClass(self, descriptor); 1308 CHECK(system_class != NULL); 1309 return system_class; 1310 } 1311 // Next try the compile time class path. 1312 const std::vector<const DexFile*>* class_path; 1313 { 1314 ScopedObjectAccessUnchecked soa(self); 1315 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1316 soa.AddLocalReference<jobject>(class_loader.get())); 1317 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1318 } 1319 1320 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1321 if (pair.second != NULL) { 1322 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1323 } 1324 1325 } else { 1326 ScopedObjectAccessUnchecked soa(self); 1327 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1328 soa.AddLocalReference<jobject>(class_loader.get())); 1329 std::string class_name_string(DescriptorToDot(descriptor)); 1330 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1331 { 1332 ScopedThreadStateChange tsc(self, kNative); 1333 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1334 soa.Env()->NewStringUTF(class_name_string.c_str())); 1335 if (class_name_object.get() == NULL) { 1336 return NULL; 1337 } 1338 CHECK(class_loader_object.get() != NULL); 1339 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1340 WellKnownClasses::java_lang_ClassLoader_loadClass, 1341 class_name_object.get())); 1342 } 1343 if (self->IsExceptionPending()) { 1344 // If the ClassLoader threw, pass that exception up. 1345 return NULL; 1346 } else if (result.get() == NULL) { 1347 // broken loader - throw NPE to be compatible with Dalvik 1348 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1349 class_name_string.c_str()).c_str()); 1350 return NULL; 1351 } else { 1352 // success, return mirror::Class* 1353 return soa.Decode<mirror::Class*>(result.get()); 1354 } 1355 } 1356 1357 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1358 return NULL; 1359} 1360 1361mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1362 const SirtRef<mirror::ClassLoader>& class_loader, 1363 const DexFile& dex_file, 1364 const DexFile::ClassDef& dex_class_def) { 1365 Thread* self = Thread::Current(); 1366 SirtRef<mirror::Class> klass(self, NULL); 1367 // Load the class from the dex file. 1368 if (UNLIKELY(!init_done_)) { 1369 // finish up init of hand crafted class_roots_ 1370 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1371 klass.reset(GetClassRoot(kJavaLangObject)); 1372 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1373 klass.reset(GetClassRoot(kJavaLangClass)); 1374 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1375 klass.reset(GetClassRoot(kJavaLangString)); 1376 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1377 klass.reset(GetClassRoot(kJavaLangDexCache)); 1378 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1379 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1380 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1381 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1382 } else { 1383 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1384 } 1385 } else { 1386 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1387 } 1388 if (UNLIKELY(klass.get() == NULL)) { 1389 CHECK(self->IsExceptionPending()); // Expect an OOME. 1390 return NULL; 1391 } 1392 klass->SetDexCache(FindDexCache(dex_file)); 1393 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1394 // Check for a pending exception during load 1395 if (self->IsExceptionPending()) { 1396 klass->SetStatus(mirror::Class::kStatusError, self); 1397 return NULL; 1398 } 1399 ObjectLock<mirror::Class> lock(self, &klass); 1400 klass->SetClinitThreadId(self->GetTid()); 1401 // Add the newly loaded class to the loaded classes table. 1402 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1403 if (existing != NULL) { 1404 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1405 // this thread to block. 1406 return EnsureResolved(self, existing); 1407 } 1408 // Finish loading (if necessary) by finding parents 1409 CHECK(!klass->IsLoaded()); 1410 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1411 // Loading failed. 1412 klass->SetStatus(mirror::Class::kStatusError, self); 1413 return NULL; 1414 } 1415 CHECK(klass->IsLoaded()); 1416 // Link the class (if necessary) 1417 CHECK(!klass->IsResolved()); 1418 // TODO: Use fast jobjects? 1419 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1420 if (!LinkClass(self, klass, interfaces)) { 1421 // Linking failed. 1422 klass->SetStatus(mirror::Class::kStatusError, self); 1423 return NULL; 1424 } 1425 CHECK(klass->IsResolved()); 1426 1427 /* 1428 * We send CLASS_PREPARE events to the debugger from here. The 1429 * definition of "preparation" is creating the static fields for a 1430 * class and initializing them to the standard default values, but not 1431 * executing any code (that comes later, during "initialization"). 1432 * 1433 * We did the static preparation in LinkClass. 1434 * 1435 * The class has been prepared and resolved but possibly not yet verified 1436 * at this point. 1437 */ 1438 Dbg::PostClassPrepare(klass.get()); 1439 1440 return klass.get(); 1441} 1442 1443// Precomputes size that will be needed for Class, matching LinkStaticFields 1444uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1445 const DexFile::ClassDef& dex_class_def) { 1446 const byte* class_data = dex_file.GetClassData(dex_class_def); 1447 size_t num_ref = 0; 1448 size_t num_32 = 0; 1449 size_t num_64 = 0; 1450 if (class_data != NULL) { 1451 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1452 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1453 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1454 char c = descriptor[0]; 1455 if (c == 'L' || c == '[') { 1456 num_ref++; 1457 } else if (c == 'J' || c == 'D') { 1458 num_64++; 1459 } else { 1460 num_32++; 1461 } 1462 } 1463 } 1464 // start with generic class data 1465 uint32_t size = sizeof(mirror::Class); 1466 // follow with reference fields which must be contiguous at start 1467 size += (num_ref * sizeof(uint32_t)); 1468 // if there are 64-bit fields to add, make sure they are aligned 1469 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1470 if (num_32 != 0) { 1471 // use an available 32-bit field for padding 1472 num_32--; 1473 } 1474 size += sizeof(uint32_t); // either way, we are adding a word 1475 DCHECK_EQ(size, RoundUp(size, 8)); 1476 } 1477 // tack on any 64-bit fields now that alignment is assured 1478 size += (num_64 * sizeof(uint64_t)); 1479 // tack on any remaining 32-bit fields 1480 size += (num_32 * sizeof(uint32_t)); 1481 return size; 1482} 1483 1484const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1485 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1486 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1487 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1488 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1489 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1490 &dex_location_checksum); 1491 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1492 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1493 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1494 return oat_class; 1495} 1496 1497static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1498 uint32_t method_idx) { 1499 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1500 const byte* class_data = dex_file.GetClassData(class_def); 1501 CHECK(class_data != NULL); 1502 ClassDataItemIterator it(dex_file, class_data); 1503 // Skip fields 1504 while (it.HasNextStaticField()) { 1505 it.Next(); 1506 } 1507 while (it.HasNextInstanceField()) { 1508 it.Next(); 1509 } 1510 // Process methods 1511 size_t class_def_method_index = 0; 1512 while (it.HasNextDirectMethod()) { 1513 if (it.GetMemberIndex() == method_idx) { 1514 return class_def_method_index; 1515 } 1516 class_def_method_index++; 1517 it.Next(); 1518 } 1519 while (it.HasNextVirtualMethod()) { 1520 if (it.GetMemberIndex() == method_idx) { 1521 return class_def_method_index; 1522 } 1523 class_def_method_index++; 1524 it.Next(); 1525 } 1526 DCHECK(!it.HasNext()); 1527 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1528 return 0; 1529} 1530 1531const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1532 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1533 // method for direct methods (or virtual methods made direct). 1534 mirror::Class* declaring_class = method->GetDeclaringClass(); 1535 size_t oat_method_index; 1536 if (method->IsStatic() || method->IsDirect()) { 1537 // Simple case where the oat method index was stashed at load time. 1538 oat_method_index = method->GetMethodIndex(); 1539 } else { 1540 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1541 // by search for its position in the declared virtual methods. 1542 oat_method_index = declaring_class->NumDirectMethods(); 1543 size_t end = declaring_class->NumVirtualMethods(); 1544 bool found = false; 1545 for (size_t i = 0; i < end; i++) { 1546 if (declaring_class->GetVirtualMethod(i) == method) { 1547 found = true; 1548 break; 1549 } 1550 oat_method_index++; 1551 } 1552 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1553 } 1554 UniquePtr<const OatFile::OatClass> 1555 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1556 declaring_class->GetDexClassDefIndex())); 1557 CHECK(oat_class.get() != NULL); 1558 DCHECK_EQ(oat_method_index, 1559 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1560 method->GetDeclaringClass()->GetDexClassDefIndex(), 1561 method->GetDexMethodIndex())); 1562 1563 return oat_class->GetOatMethod(oat_method_index); 1564} 1565 1566// Special case to get oat code without overwriting a trampoline. 1567const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1568 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1569 if (method->IsProxyMethod()) { 1570 return GetQuickProxyInvokeHandler(); 1571 } 1572 const void* result = GetOatMethodFor(method).GetQuickCode(); 1573 if (result == nullptr) { 1574 if (method->IsPortableCompiled()) { 1575 // No code? Do we expect portable code? 1576 result = GetQuickToPortableBridge(); 1577 } else { 1578 // No code? You must mean to go into the interpreter. 1579 result = GetQuickToInterpreterBridge(); 1580 } 1581 } 1582 return result; 1583} 1584 1585const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1586 bool* have_portable_code) { 1587 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1588 *have_portable_code = false; 1589 if (method->IsProxyMethod()) { 1590 return GetPortableProxyInvokeHandler(); 1591 } 1592 const void* result = GetOatMethodFor(method).GetPortableCode(); 1593 if (result == nullptr) { 1594 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1595 // No code? You must mean to go into the interpreter. 1596 result = GetPortableToInterpreterBridge(); 1597 } else { 1598 // No code? But there's quick code, so use a bridge. 1599 result = GetPortableToQuickBridge(); 1600 } 1601 } else { 1602 *have_portable_code = true; 1603 } 1604 return result; 1605} 1606 1607const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1608 uint32_t method_idx) { 1609 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1610 CHECK(oat_class.get() != nullptr); 1611 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1612 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1613} 1614 1615const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1616 uint32_t method_idx) { 1617 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1618 CHECK(oat_class.get() != nullptr); 1619 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1620 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1621} 1622 1623// Returns true if the method must run with interpreter, false otherwise. 1624static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1625 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1626 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1627 // No code: need interpreter. 1628 // May return true for native code, in the case of generic JNI 1629 // DCHECK(!method->IsNative()); 1630 return true; 1631 } 1632#ifdef ART_SEA_IR_MODE 1633 ScopedObjectAccess soa(Thread::Current()); 1634 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1635 LOG(INFO) << "Found " << PrettyMethod(method); 1636 return false; 1637 } 1638#endif 1639 // If interpreter mode is enabled, every method (except native and proxy) must 1640 // be run with interpreter. 1641 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1642 !method->IsNative() && !method->IsProxyMethod(); 1643} 1644 1645void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1646 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1647 if (klass->NumDirectMethods() == 0) { 1648 return; // No direct methods => no static methods. 1649 } 1650 Runtime* runtime = Runtime::Current(); 1651 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1652 return; // OAT file unavailable. 1653 } 1654 ClassHelper kh(klass); 1655 const DexFile& dex_file = kh.GetDexFile(); 1656 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1657 CHECK(dex_class_def != nullptr); 1658 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1659 // There should always be class data if there were direct methods. 1660 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1661 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1662 CHECK(oat_class.get() != nullptr); 1663 ClassDataItemIterator it(dex_file, class_data); 1664 // Skip fields 1665 while (it.HasNextStaticField()) { 1666 it.Next(); 1667 } 1668 while (it.HasNextInstanceField()) { 1669 it.Next(); 1670 } 1671 // Link the code of methods skipped by LinkCode. 1672 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1673 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1674 if (!method->IsStatic()) { 1675 // Only update static methods. 1676 continue; 1677 } 1678 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1679 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1680 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1681 bool have_portable_code = false; 1682 if (enter_interpreter) { 1683 // Use interpreter entry point. 1684 1685 // check whether the method is native, in which case it's generic JNI 1686 portable_code = GetPortableToInterpreterBridge(); 1687 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1688 quick_code = GetQuickGenericJniTrampoline(); 1689 } else { 1690 quick_code = GetQuickToInterpreterBridge(); 1691 } 1692 } else { 1693 if (portable_code == nullptr) { 1694 portable_code = GetPortableToQuickBridge(); 1695 } else { 1696 have_portable_code = true; 1697 } 1698 if (quick_code == nullptr) { 1699 quick_code = GetQuickToPortableBridge(); 1700 } 1701 } 1702 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1703 have_portable_code); 1704 } 1705 // Ignore virtual methods on the iterator. 1706} 1707 1708static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1709 uint32_t method_index) 1710 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1711 // Method shouldn't have already been linked. 1712 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1713 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1714 // Every kind of method should at least get an invoke stub from the oat_method. 1715 // non-abstract methods also get their code pointers. 1716 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1717 oat_method.LinkMethod(method.get()); 1718 1719 // Install entry point from interpreter. 1720 Runtime* runtime = Runtime::Current(); 1721 bool enter_interpreter = NeedsInterpreter(method.get(), 1722 method->GetEntryPointFromQuickCompiledCode(), 1723 method->GetEntryPointFromPortableCompiledCode()); 1724 if (enter_interpreter) { 1725 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1726 } else { 1727 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1728 } 1729 1730 if (method->IsAbstract()) { 1731 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1732 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1733 return; 1734 } 1735 1736 bool have_portable_code = false; 1737 if (method->IsStatic() && !method->IsConstructor()) { 1738 // For static methods excluding the class initializer, install the trampoline. 1739 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1740 // after initializing class (see ClassLinker::InitializeClass method). 1741 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1742 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1743 } else if (enter_interpreter) { 1744 // Set entry point from compiled code if there's no code or in interpreter only mode. 1745 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1746 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1747 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1748 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1749 have_portable_code = true; 1750 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1751 } else { 1752 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1753 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1754 } 1755 1756 if (method->IsNative()) { 1757 // Unregistering restores the dlsym lookup stub. 1758 method->UnregisterNative(Thread::Current()); 1759 } 1760 1761 // Allow instrumentation its chance to hijack code. 1762 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1763 method->GetEntryPointFromQuickCompiledCode(), 1764 method->GetEntryPointFromPortableCompiledCode(), 1765 have_portable_code); 1766} 1767 1768void ClassLinker::LoadClass(const DexFile& dex_file, 1769 const DexFile::ClassDef& dex_class_def, 1770 const SirtRef<mirror::Class>& klass, 1771 mirror::ClassLoader* class_loader) { 1772 CHECK(klass.get() != NULL); 1773 CHECK(klass->GetDexCache() != NULL); 1774 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1775 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1776 CHECK(descriptor != NULL); 1777 1778 klass->SetClass(GetClassRoot(kJavaLangClass)); 1779 if (kUseBrooksPointer) { 1780 klass->AssertSelfBrooksPointer(); 1781 } 1782 uint32_t access_flags = dex_class_def.access_flags_; 1783 // Make sure that none of our runtime-only flags are set. 1784 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1785 klass->SetAccessFlags(access_flags); 1786 klass->SetClassLoader(class_loader); 1787 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1788 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1789 1790 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1791 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1792 1793 // Load fields fields. 1794 const byte* class_data = dex_file.GetClassData(dex_class_def); 1795 if (class_data == NULL) { 1796 return; // no fields or methods - for example a marker interface 1797 } 1798 ClassDataItemIterator it(dex_file, class_data); 1799 Thread* self = Thread::Current(); 1800 if (it.NumStaticFields() != 0) { 1801 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1802 if (UNLIKELY(statics == NULL)) { 1803 CHECK(self->IsExceptionPending()); // OOME. 1804 return; 1805 } 1806 klass->SetSFields(statics); 1807 } 1808 if (it.NumInstanceFields() != 0) { 1809 mirror::ObjectArray<mirror::ArtField>* fields = 1810 AllocArtFieldArray(self, it.NumInstanceFields()); 1811 if (UNLIKELY(fields == NULL)) { 1812 CHECK(self->IsExceptionPending()); // OOME. 1813 return; 1814 } 1815 klass->SetIFields(fields); 1816 } 1817 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1818 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1819 if (UNLIKELY(sfield.get() == NULL)) { 1820 CHECK(self->IsExceptionPending()); // OOME. 1821 return; 1822 } 1823 klass->SetStaticField(i, sfield.get()); 1824 LoadField(dex_file, it, klass, sfield); 1825 } 1826 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1827 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1828 if (UNLIKELY(ifield.get() == NULL)) { 1829 CHECK(self->IsExceptionPending()); // OOME. 1830 return; 1831 } 1832 klass->SetInstanceField(i, ifield.get()); 1833 LoadField(dex_file, it, klass, ifield); 1834 } 1835 1836 UniquePtr<const OatFile::OatClass> oat_class; 1837 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1838 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1839 } 1840 1841 // Load methods. 1842 if (it.NumDirectMethods() != 0) { 1843 // TODO: append direct methods to class object 1844 mirror::ObjectArray<mirror::ArtMethod>* directs = 1845 AllocArtMethodArray(self, it.NumDirectMethods()); 1846 if (UNLIKELY(directs == NULL)) { 1847 CHECK(self->IsExceptionPending()); // OOME. 1848 return; 1849 } 1850 klass->SetDirectMethods(directs); 1851 } 1852 if (it.NumVirtualMethods() != 0) { 1853 // TODO: append direct methods to class object 1854 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1855 AllocArtMethodArray(self, it.NumVirtualMethods()); 1856 if (UNLIKELY(virtuals == NULL)) { 1857 CHECK(self->IsExceptionPending()); // OOME. 1858 return; 1859 } 1860 klass->SetVirtualMethods(virtuals); 1861 } 1862 size_t class_def_method_index = 0; 1863 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1864 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1865 if (UNLIKELY(method.get() == NULL)) { 1866 CHECK(self->IsExceptionPending()); // OOME. 1867 return; 1868 } 1869 klass->SetDirectMethod(i, method.get()); 1870 if (oat_class.get() != NULL) { 1871 LinkCode(method, oat_class.get(), class_def_method_index); 1872 } 1873 method->SetMethodIndex(class_def_method_index); 1874 class_def_method_index++; 1875 } 1876 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1877 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1878 if (UNLIKELY(method.get() == NULL)) { 1879 CHECK(self->IsExceptionPending()); // OOME. 1880 return; 1881 } 1882 klass->SetVirtualMethod(i, method.get()); 1883 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1884 if (oat_class.get() != NULL) { 1885 LinkCode(method, oat_class.get(), class_def_method_index); 1886 } 1887 class_def_method_index++; 1888 } 1889 DCHECK(!it.HasNext()); 1890} 1891 1892void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1893 const SirtRef<mirror::Class>& klass, 1894 const SirtRef<mirror::ArtField>& dst) { 1895 uint32_t field_idx = it.GetMemberIndex(); 1896 dst->SetDexFieldIndex(field_idx); 1897 dst->SetDeclaringClass(klass.get()); 1898 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1899} 1900 1901mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1902 const ClassDataItemIterator& it, 1903 const SirtRef<mirror::Class>& klass) { 1904 uint32_t dex_method_idx = it.GetMemberIndex(); 1905 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1906 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1907 1908 mirror::ArtMethod* dst = AllocArtMethod(self); 1909 if (UNLIKELY(dst == NULL)) { 1910 CHECK(self->IsExceptionPending()); // OOME. 1911 return NULL; 1912 } 1913 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1914 1915 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1916 dst->SetDexMethodIndex(dex_method_idx); 1917 dst->SetDeclaringClass(klass.get()); 1918 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1919 1920 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1921 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1922 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1923 1924 uint32_t access_flags = it.GetMemberAccessFlags(); 1925 1926 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1927 // Set finalizable flag on declaring class. 1928 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1929 // Void return type. 1930 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1931 klass->SetFinalizable(); 1932 } else { 1933 ClassHelper kh(klass.get()); 1934 const char* klass_descriptor = kh.GetDescriptor(); 1935 // The Enum class declares a "final" finalize() method to prevent subclasses from 1936 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1937 // subclasses, so we exclude it here. 1938 // We also want to avoid setting the flag on Object, where we know that finalize() is 1939 // empty. 1940 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1941 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1942 klass->SetFinalizable(); 1943 } 1944 } 1945 } 1946 } else if (method_name[0] == '<') { 1947 // Fix broken access flags for initializers. Bug 11157540. 1948 bool is_init = (strcmp("<init>", method_name) == 0); 1949 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1950 if (UNLIKELY(!is_init && !is_clinit)) { 1951 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1952 } else { 1953 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1954 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1955 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1956 access_flags |= kAccConstructor; 1957 } 1958 } 1959 } 1960 dst->SetAccessFlags(access_flags); 1961 1962 self->EndAssertNoThreadSuspension(old_cause); 1963 return dst; 1964} 1965 1966void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1967 Thread* self = Thread::Current(); 1968 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1969 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1970 AppendToBootClassPath(dex_file, dex_cache); 1971} 1972 1973void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 1974 const SirtRef<mirror::DexCache>& dex_cache) { 1975 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1976 boot_class_path_.push_back(&dex_file); 1977 RegisterDexFile(dex_file, dex_cache); 1978} 1979 1980bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1981 dex_lock_.AssertSharedHeld(Thread::Current()); 1982 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1983 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1984 return true; 1985 } 1986 } 1987 return false; 1988} 1989 1990bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1991 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1992 return IsDexFileRegisteredLocked(dex_file); 1993} 1994 1995void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 1996 const SirtRef<mirror::DexCache>& dex_cache) { 1997 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1998 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1999 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2000 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2001 dex_caches_.push_back(dex_cache.get()); 2002 dex_cache->SetDexFile(&dex_file); 2003 dex_caches_dirty_ = true; 2004} 2005 2006void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2007 Thread* self = Thread::Current(); 2008 { 2009 ReaderMutexLock mu(self, dex_lock_); 2010 if (IsDexFileRegisteredLocked(dex_file)) { 2011 return; 2012 } 2013 } 2014 // Don't alloc while holding the lock, since allocation may need to 2015 // suspend all threads and another thread may need the dex_lock_ to 2016 // get to a suspend point. 2017 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2018 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2019 { 2020 WriterMutexLock mu(self, dex_lock_); 2021 if (IsDexFileRegisteredLocked(dex_file)) { 2022 return; 2023 } 2024 RegisterDexFileLocked(dex_file, dex_cache); 2025 } 2026} 2027 2028void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2029 const SirtRef<mirror::DexCache>& dex_cache) { 2030 WriterMutexLock mu(Thread::Current(), dex_lock_); 2031 RegisterDexFileLocked(dex_file, dex_cache); 2032} 2033 2034mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2035 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2036 // Search assuming unique-ness of dex file. 2037 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2038 mirror::DexCache* dex_cache = dex_caches_[i]; 2039 if (dex_cache->GetDexFile() == &dex_file) { 2040 return dex_cache; 2041 } 2042 } 2043 // Search matching by location name. 2044 std::string location(dex_file.GetLocation()); 2045 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2046 mirror::DexCache* dex_cache = dex_caches_[i]; 2047 if (dex_cache->GetDexFile()->GetLocation() == location) { 2048 return dex_cache; 2049 } 2050 } 2051 // Failure, dump diagnostic and abort. 2052 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2053 mirror::DexCache* dex_cache = dex_caches_[i]; 2054 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2055 } 2056 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2057 return NULL; 2058} 2059 2060void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2061 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2062 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2063 dex_caches_[i]->Fixup(resolution_method); 2064 } 2065} 2066 2067mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2068 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2069 if (UNLIKELY(klass == NULL)) { 2070 return NULL; 2071 } 2072 return InitializePrimitiveClass(klass, type); 2073} 2074 2075mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2076 Primitive::Type type) { 2077 CHECK(primitive_class != NULL); 2078 // Must hold lock on object when initializing. 2079 Thread* self = Thread::Current(); 2080 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2081 ObjectLock<mirror::Class> lock(self, &sirt_class); 2082 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2083 primitive_class->SetPrimitiveType(type); 2084 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2085 const char* descriptor = Primitive::Descriptor(type); 2086 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2087 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2088 return primitive_class; 2089} 2090 2091// Create an array class (i.e. the class object for the array, not the 2092// array itself). "descriptor" looks like "[C" or "[[[[B" or 2093// "[Ljava/lang/String;". 2094// 2095// If "descriptor" refers to an array of primitives, look up the 2096// primitive type's internally-generated class object. 2097// 2098// "class_loader" is the class loader of the class that's referring to 2099// us. It's used to ensure that we're looking for the element type in 2100// the right context. It does NOT become the class loader for the 2101// array class; that always comes from the base element class. 2102// 2103// Returns NULL with an exception raised on failure. 2104mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2105 const SirtRef<mirror::ClassLoader>& class_loader) { 2106 // Identify the underlying component type 2107 CHECK_EQ('[', descriptor[0]); 2108 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2109 if (component_type.get() == nullptr) { 2110 DCHECK(self->IsExceptionPending()); 2111 return nullptr; 2112 } 2113 2114 // See if the component type is already loaded. Array classes are 2115 // always associated with the class loader of their underlying 2116 // element type -- an array of Strings goes with the loader for 2117 // java/lang/String -- so we need to look for it there. (The 2118 // caller should have checked for the existence of the class 2119 // before calling here, but they did so with *their* class loader, 2120 // not the component type's loader.) 2121 // 2122 // If we find it, the caller adds "loader" to the class' initiating 2123 // loader list, which should prevent us from going through this again. 2124 // 2125 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2126 // are the same, because our caller (FindClass) just did the 2127 // lookup. (Even if we get this wrong we still have correct behavior, 2128 // because we effectively do this lookup again when we add the new 2129 // class to the hash table --- necessary because of possible races with 2130 // other threads.) 2131 if (class_loader.get() != component_type->GetClassLoader()) { 2132 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2133 if (new_class != NULL) { 2134 return new_class; 2135 } 2136 } 2137 2138 // Fill out the fields in the Class. 2139 // 2140 // It is possible to execute some methods against arrays, because 2141 // all arrays are subclasses of java_lang_Object_, so we need to set 2142 // up a vtable. We can just point at the one in java_lang_Object_. 2143 // 2144 // Array classes are simple enough that we don't need to do a full 2145 // link step. 2146 SirtRef<mirror::Class> new_class(self, NULL); 2147 if (UNLIKELY(!init_done_)) { 2148 // Classes that were hand created, ie not by FindSystemClass 2149 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2150 new_class.reset(GetClassRoot(kClassArrayClass)); 2151 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2152 new_class.reset(GetClassRoot(kObjectArrayClass)); 2153 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2154 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2155 } else if (strcmp(descriptor, 2156 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2157 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2158 } else if (strcmp(descriptor, 2159 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2160 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2161 } else if (strcmp(descriptor, "[C") == 0) { 2162 new_class.reset(GetClassRoot(kCharArrayClass)); 2163 } else if (strcmp(descriptor, "[I") == 0) { 2164 new_class.reset(GetClassRoot(kIntArrayClass)); 2165 } 2166 } 2167 if (new_class.get() == nullptr) { 2168 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2169 if (new_class.get() == nullptr) { 2170 return nullptr; 2171 } 2172 new_class->SetComponentType(component_type.get()); 2173 } 2174 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2175 DCHECK(new_class->GetComponentType() != NULL); 2176 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2177 new_class->SetSuperClass(java_lang_Object); 2178 new_class->SetVTable(java_lang_Object->GetVTable()); 2179 new_class->SetPrimitiveType(Primitive::kPrimNot); 2180 new_class->SetClassLoader(component_type->GetClassLoader()); 2181 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2182 // don't need to set new_class->SetObjectSize(..) 2183 // because Object::SizeOf delegates to Array::SizeOf 2184 2185 2186 // All arrays have java/lang/Cloneable and java/io/Serializable as 2187 // interfaces. We need to set that up here, so that stuff like 2188 // "instanceof" works right. 2189 // 2190 // Note: The GC could run during the call to FindSystemClass, 2191 // so we need to make sure the class object is GC-valid while we're in 2192 // there. Do this by clearing the interface list so the GC will just 2193 // think that the entries are null. 2194 2195 2196 // Use the single, global copies of "interfaces" and "iftable" 2197 // (remember not to free them for arrays). 2198 CHECK(array_iftable_ != nullptr); 2199 new_class->SetIfTable(array_iftable_); 2200 2201 // Inherit access flags from the component type. 2202 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2203 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2204 access_flags &= kAccJavaFlagsMask; 2205 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2206 // and remove "interface". 2207 access_flags |= kAccAbstract | kAccFinal; 2208 access_flags &= ~kAccInterface; 2209 2210 new_class->SetAccessFlags(access_flags); 2211 2212 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2213 if (existing == nullptr) { 2214 return new_class.get(); 2215 } 2216 // Another thread must have loaded the class after we 2217 // started but before we finished. Abandon what we've 2218 // done. 2219 // 2220 // (Yes, this happens.) 2221 2222 return existing; 2223} 2224 2225mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2226 switch (Primitive::GetType(type)) { 2227 case Primitive::kPrimByte: 2228 return GetClassRoot(kPrimitiveByte); 2229 case Primitive::kPrimChar: 2230 return GetClassRoot(kPrimitiveChar); 2231 case Primitive::kPrimDouble: 2232 return GetClassRoot(kPrimitiveDouble); 2233 case Primitive::kPrimFloat: 2234 return GetClassRoot(kPrimitiveFloat); 2235 case Primitive::kPrimInt: 2236 return GetClassRoot(kPrimitiveInt); 2237 case Primitive::kPrimLong: 2238 return GetClassRoot(kPrimitiveLong); 2239 case Primitive::kPrimShort: 2240 return GetClassRoot(kPrimitiveShort); 2241 case Primitive::kPrimBoolean: 2242 return GetClassRoot(kPrimitiveBoolean); 2243 case Primitive::kPrimVoid: 2244 return GetClassRoot(kPrimitiveVoid); 2245 case Primitive::kPrimNot: 2246 break; 2247 } 2248 std::string printable_type(PrintableChar(type)); 2249 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2250 return NULL; 2251} 2252 2253mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2254 size_t hash) { 2255 if (VLOG_IS_ON(class_linker)) { 2256 mirror::DexCache* dex_cache = klass->GetDexCache(); 2257 std::string source; 2258 if (dex_cache != NULL) { 2259 source += " from "; 2260 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2261 } 2262 LOG(INFO) << "Loaded class " << descriptor << source; 2263 } 2264 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2265 mirror::Class* existing = 2266 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2267 if (existing != NULL) { 2268 return existing; 2269 } 2270 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2271 // Check a class loaded with the system class loader matches one in the image if the class 2272 // is in the image. 2273 existing = LookupClassFromImage(descriptor); 2274 if (existing != NULL) { 2275 CHECK(klass == existing); 2276 } 2277 } 2278 VerifyObject(klass); 2279 class_table_.insert(std::make_pair(hash, klass)); 2280 class_table_dirty_ = true; 2281 return NULL; 2282} 2283 2284bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2285 size_t hash = Hash(descriptor); 2286 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2287 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2288 ++it) { 2289 mirror::Class* klass = it->second; 2290 ClassHelper kh(klass); 2291 if ((klass->GetClassLoader() == class_loader) && 2292 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2293 class_table_.erase(it); 2294 return true; 2295 } 2296 } 2297 return false; 2298} 2299 2300mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2301 const mirror::ClassLoader* class_loader) { 2302 size_t hash = Hash(descriptor); 2303 { 2304 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2305 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2306 if (result != NULL) { 2307 return result; 2308 } 2309 } 2310 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2311 return NULL; 2312 } else { 2313 // Lookup failed but need to search dex_caches_. 2314 mirror::Class* result = LookupClassFromImage(descriptor); 2315 if (result != NULL) { 2316 InsertClass(descriptor, result, hash); 2317 } else { 2318 // Searching the image dex files/caches failed, we don't want to get into this situation 2319 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2320 // classes into the class table. 2321 const int32_t kMaxFailedDexCacheLookups = 1000; 2322 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2323 MoveImageClassesToClassTable(); 2324 } 2325 } 2326 return result; 2327 } 2328} 2329 2330mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2331 const mirror::ClassLoader* class_loader, 2332 size_t hash) { 2333 auto end = class_table_.end(); 2334 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2335 mirror::Class* klass = it->second; 2336 ClassHelper kh(klass); 2337 if ((klass->GetClassLoader() == class_loader) && 2338 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2339 if (kIsDebugBuild) { 2340 // Check for duplicates in the table. 2341 for (++it; it != end && it->first == hash; ++it) { 2342 mirror::Class* klass2 = it->second; 2343 ClassHelper kh(klass2); 2344 CHECK(!((klass2->GetClassLoader() == class_loader) && 2345 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2346 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2347 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2348 } 2349 } 2350 return klass; 2351 } 2352 } 2353 return NULL; 2354} 2355 2356static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2357 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2358 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2359 CHECK(image != NULL); 2360 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2361 return root->AsObjectArray<mirror::DexCache>(); 2362} 2363 2364void ClassLinker::MoveImageClassesToClassTable() { 2365 Thread* self = Thread::Current(); 2366 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2367 if (!dex_cache_image_class_lookup_required_) { 2368 return; // All dex cache classes are already in the class table. 2369 } 2370 const char* old_no_suspend_cause = 2371 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2372 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2373 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2374 mirror::DexCache* dex_cache = dex_caches->Get(i); 2375 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2376 for (int32_t j = 0; j < types->GetLength(); j++) { 2377 mirror::Class* klass = types->Get(j); 2378 if (klass != NULL) { 2379 ClassHelper kh(klass); 2380 DCHECK(klass->GetClassLoader() == NULL); 2381 const char* descriptor = kh.GetDescriptor(); 2382 size_t hash = Hash(descriptor); 2383 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2384 if (existing != NULL) { 2385 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2386 << PrettyClassAndClassLoader(klass); 2387 } else { 2388 class_table_.insert(std::make_pair(hash, klass)); 2389 } 2390 } 2391 } 2392 } 2393 class_table_dirty_ = true; 2394 dex_cache_image_class_lookup_required_ = false; 2395 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2396} 2397 2398mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2399 Thread* self = Thread::Current(); 2400 const char* old_no_suspend_cause = 2401 self->StartAssertNoThreadSuspension("Image class lookup"); 2402 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2403 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2404 mirror::DexCache* dex_cache = dex_caches->Get(i); 2405 const DexFile* dex_file = dex_cache->GetDexFile(); 2406 // Try binary searching the string/type index. 2407 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2408 if (string_id != NULL) { 2409 const DexFile::TypeId* type_id = 2410 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2411 if (type_id != NULL) { 2412 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2413 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2414 if (klass != NULL) { 2415 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2416 return klass; 2417 } 2418 } 2419 } 2420 } 2421 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2422 return NULL; 2423} 2424 2425void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2426 result.clear(); 2427 if (dex_cache_image_class_lookup_required_) { 2428 MoveImageClassesToClassTable(); 2429 } 2430 size_t hash = Hash(descriptor); 2431 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2432 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2433 it != end && it->first == hash; ++it) { 2434 mirror::Class* klass = it->second; 2435 ClassHelper kh(klass); 2436 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2437 result.push_back(klass); 2438 } 2439 } 2440} 2441 2442void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2443 // TODO: assert that the monitor on the Class is held 2444 Thread* self = Thread::Current(); 2445 ObjectLock<mirror::Class> lock(self, &klass); 2446 2447 // Don't attempt to re-verify if already sufficiently verified. 2448 if (klass->IsVerified() || 2449 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2450 return; 2451 } 2452 2453 // The class might already be erroneous, for example at compile time if we attempted to verify 2454 // this class as a parent to another. 2455 if (klass->IsErroneous()) { 2456 ThrowEarlierClassFailure(klass.get()); 2457 return; 2458 } 2459 2460 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2461 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2462 } else { 2463 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2464 << PrettyClass(klass.get()); 2465 CHECK(!Runtime::Current()->IsCompiler()); 2466 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2467 } 2468 2469 // Verify super class. 2470 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2471 if (super.get() != NULL) { 2472 // Acquire lock to prevent races on verifying the super class. 2473 ObjectLock<mirror::Class> lock(self, &super); 2474 2475 if (!super->IsVerified() && !super->IsErroneous()) { 2476 VerifyClass(super); 2477 } 2478 if (!super->IsCompileTimeVerified()) { 2479 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2480 PrettyDescriptor(klass.get()).c_str(), 2481 PrettyDescriptor(super.get()).c_str())); 2482 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2483 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2484 if (cause.get() != nullptr) { 2485 self->ClearException(); 2486 } 2487 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2488 if (cause.get() != nullptr) { 2489 self->GetException(nullptr)->SetCause(cause.get()); 2490 } 2491 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2492 if (Runtime::Current()->IsCompiler()) { 2493 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2494 } 2495 klass->SetStatus(mirror::Class::kStatusError, self); 2496 return; 2497 } 2498 } 2499 2500 // Try to use verification information from the oat file, otherwise do runtime verification. 2501 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2502 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2503 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2504 if (oat_file_class_status == mirror::Class::kStatusError) { 2505 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2506 << PrettyDescriptor(klass.get()) << " in " 2507 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2508 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2509 PrettyDescriptor(klass.get()).c_str()); 2510 klass->SetStatus(mirror::Class::kStatusError, self); 2511 return; 2512 } 2513 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2514 std::string error_msg; 2515 if (!preverified) { 2516 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2517 Runtime::Current()->IsCompiler(), 2518 &error_msg); 2519 } 2520 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2521 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2522 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2523 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2524 << " because: " << error_msg; 2525 } 2526 self->AssertNoPendingException(); 2527 // Make sure all classes referenced by catch blocks are resolved. 2528 ResolveClassExceptionHandlerTypes(dex_file, klass); 2529 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2530 // Even though there were no verifier failures we need to respect whether the super-class 2531 // was verified or requiring runtime reverification. 2532 if (super.get() == NULL || super->IsVerified()) { 2533 klass->SetStatus(mirror::Class::kStatusVerified, self); 2534 } else { 2535 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2536 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2537 // Pretend a soft failure occured so that we don't consider the class verified below. 2538 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2539 } 2540 } else { 2541 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2542 // Soft failures at compile time should be retried at runtime. Soft 2543 // failures at runtime will be handled by slow paths in the generated 2544 // code. Set status accordingly. 2545 if (Runtime::Current()->IsCompiler()) { 2546 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2547 } else { 2548 klass->SetStatus(mirror::Class::kStatusVerified, self); 2549 } 2550 } 2551 } else { 2552 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2553 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2554 << " because: " << error_msg; 2555 self->AssertNoPendingException(); 2556 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2557 klass->SetStatus(mirror::Class::kStatusError, self); 2558 } 2559 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2560 // Class is verified so we don't need to do any access check on its methods. 2561 // Let the interpreter know it by setting the kAccPreverified flag onto each 2562 // method. 2563 // Note: we're going here during compilation and at runtime. When we set the 2564 // kAccPreverified flag when compiling image classes, the flag is recorded 2565 // in the image and is set when loading the image. 2566 klass->SetPreverifiedFlagOnAllMethods(); 2567 } 2568} 2569 2570bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2571 mirror::Class::Status& oat_file_class_status) { 2572 // If we're compiling, we can only verify the class using the oat file if 2573 // we are not compiling the image or if the class we're verifying is not part of 2574 // the app. In other words, we will only check for preverification of bootclasspath 2575 // classes. 2576 if (Runtime::Current()->IsCompiler()) { 2577 // Are we compiling the bootclasspath? 2578 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2579 return false; 2580 } 2581 // We are compiling an app (not the image). 2582 2583 // Is this an app class? (I.e. not a bootclasspath class) 2584 if (klass->GetClassLoader() != NULL) { 2585 return false; 2586 } 2587 } 2588 2589 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2590 // Make this work with gtests, which do not set up the image properly. 2591 // TODO: we should clean up gtests to set up the image path properly. 2592 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2593 return false; 2594 } 2595 2596 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2597 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2598 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2599 &dex_location_checksum); 2600 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2601 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2602 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2603 CHECK(oat_class.get() != NULL) 2604 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2605 << ClassHelper(klass).GetDescriptor(); 2606 oat_file_class_status = oat_class->GetStatus(); 2607 if (oat_file_class_status == mirror::Class::kStatusVerified || 2608 oat_file_class_status == mirror::Class::kStatusInitialized) { 2609 return true; 2610 } 2611 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2612 // Compile time verification failed with a soft error. Compile time verification can fail 2613 // because we have incomplete type information. Consider the following: 2614 // class ... { 2615 // Foo x; 2616 // .... () { 2617 // if (...) { 2618 // v1 gets assigned a type of resolved class Foo 2619 // } else { 2620 // v1 gets assigned a type of unresolved class Bar 2621 // } 2622 // iput x = v1 2623 // } } 2624 // when we merge v1 following the if-the-else it results in Conflict 2625 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2626 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2627 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2628 // at compile time). 2629 return false; 2630 } 2631 if (oat_file_class_status == mirror::Class::kStatusError) { 2632 // Compile time verification failed with a hard error. This is caused by invalid instructions 2633 // in the class. These errors are unrecoverable. 2634 return false; 2635 } 2636 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2637 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2638 // not loading the class. 2639 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2640 // isn't a problem and this case shouldn't occur 2641 return false; 2642 } 2643 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2644 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2645 << ClassHelper(klass).GetDescriptor(); 2646 2647 return false; 2648} 2649 2650void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2651 const SirtRef<mirror::Class>& klass) { 2652 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2653 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2654 } 2655 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2656 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2657 } 2658} 2659 2660void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2661 mirror::ArtMethod* method) { 2662 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2663 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2664 if (code_item == NULL) { 2665 return; // native or abstract method 2666 } 2667 if (code_item->tries_size_ == 0) { 2668 return; // nothing to process 2669 } 2670 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2671 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2672 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2673 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2674 CatchHandlerIterator iterator(handlers_ptr); 2675 for (; iterator.HasNext(); iterator.Next()) { 2676 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2677 // unresolved exception types will be ignored by exception delivery 2678 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2679 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2680 if (exception_type == NULL) { 2681 DCHECK(Thread::Current()->IsExceptionPending()); 2682 Thread::Current()->ClearException(); 2683 } 2684 } 2685 } 2686 handlers_ptr = iterator.EndDataPointer(); 2687 } 2688} 2689 2690static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2691static void CheckProxyMethod(mirror::ArtMethod* method, 2692 SirtRef<mirror::ArtMethod>& prototype); 2693 2694mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2695 jobjectArray interfaces, jobject loader, 2696 jobjectArray methods, jobjectArray throws) { 2697 Thread* self = soa.Self(); 2698 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2699 sizeof(mirror::SynthesizedProxyClass))); 2700 if (klass.get() == NULL) { 2701 CHECK(self->IsExceptionPending()); // OOME. 2702 return NULL; 2703 } 2704 DCHECK(klass->GetClass() != NULL); 2705 klass->SetObjectSize(sizeof(mirror::Proxy)); 2706 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2707 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2708 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2709 klass->SetName(soa.Decode<mirror::String*>(name)); 2710 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2711 klass->SetDexCache(proxy_class->GetDexCache()); 2712 klass->SetStatus(mirror::Class::kStatusIdx, self); 2713 2714 // Instance fields are inherited, but we add a couple of static fields... 2715 { 2716 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2717 if (UNLIKELY(sfields == NULL)) { 2718 CHECK(self->IsExceptionPending()); // OOME. 2719 return NULL; 2720 } 2721 klass->SetSFields(sfields); 2722 } 2723 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2724 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2725 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2726 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2727 CHECK(self->IsExceptionPending()); // OOME. 2728 return NULL; 2729 } 2730 klass->SetStaticField(0, interfaces_sfield.get()); 2731 interfaces_sfield->SetDexFieldIndex(0); 2732 interfaces_sfield->SetDeclaringClass(klass.get()); 2733 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2734 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2735 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2736 if (UNLIKELY(throws_sfield.get() == NULL)) { 2737 CHECK(self->IsExceptionPending()); // OOME. 2738 return NULL; 2739 } 2740 klass->SetStaticField(1, throws_sfield.get()); 2741 throws_sfield->SetDexFieldIndex(1); 2742 throws_sfield->SetDeclaringClass(klass.get()); 2743 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2744 2745 // Proxies have 1 direct method, the constructor 2746 { 2747 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2748 if (UNLIKELY(directs == NULL)) { 2749 CHECK(self->IsExceptionPending()); // OOME. 2750 return NULL; 2751 } 2752 klass->SetDirectMethods(directs); 2753 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2754 if (UNLIKELY(constructor == NULL)) { 2755 CHECK(self->IsExceptionPending()); // OOME. 2756 return NULL; 2757 } 2758 klass->SetDirectMethod(0, constructor); 2759 } 2760 2761 // Create virtual method using specified prototypes. 2762 size_t num_virtual_methods = 2763 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2764 { 2765 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2766 if (UNLIKELY(virtuals == NULL)) { 2767 CHECK(self->IsExceptionPending()); // OOME. 2768 return NULL; 2769 } 2770 klass->SetVirtualMethods(virtuals); 2771 } 2772 for (size_t i = 0; i < num_virtual_methods; ++i) { 2773 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2774 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2775 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2776 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2777 if (UNLIKELY(clone == NULL)) { 2778 CHECK(self->IsExceptionPending()); // OOME. 2779 return NULL; 2780 } 2781 klass->SetVirtualMethod(i, clone); 2782 } 2783 2784 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2785 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2786 self->AssertNoPendingException(); 2787 2788 { 2789 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2790 // Link the fields and virtual methods, creating vtable and iftables 2791 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2792 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2793 if (!LinkClass(self, klass, sirt_interfaces)) { 2794 klass->SetStatus(mirror::Class::kStatusError, self); 2795 return nullptr; 2796 } 2797 2798 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2799 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2800 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2801 } 2802 2803 // sanity checks 2804 if (kIsDebugBuild) { 2805 CHECK(klass->GetIFields() == NULL); 2806 CheckProxyConstructor(klass->GetDirectMethod(0)); 2807 for (size_t i = 0; i < num_virtual_methods; ++i) { 2808 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2809 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2810 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2811 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2812 } 2813 2814 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2815 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2816 decoded_name->ToModifiedUtf8().c_str())); 2817 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2818 2819 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2820 decoded_name->ToModifiedUtf8().c_str())); 2821 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2822 2823 mirror::SynthesizedProxyClass* synth_proxy_class = 2824 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2825 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2826 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2827 } 2828 std::string descriptor(GetDescriptorForProxy(klass.get())); 2829 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2830 CHECK(existing == nullptr); 2831 return klass.get(); 2832} 2833 2834std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2835 DCHECK(proxy_class->IsProxyClass()); 2836 mirror::String* name = proxy_class->GetName(); 2837 DCHECK(name != NULL); 2838 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2839} 2840 2841mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2842 mirror::ArtMethod* proxy_method) { 2843 DCHECK(proxy_class->IsProxyClass()); 2844 DCHECK(proxy_method->IsProxyMethod()); 2845 // Locate the dex cache of the original interface/Object 2846 mirror::DexCache* dex_cache = NULL; 2847 { 2848 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2849 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2850 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2851 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2852 dex_cache = dex_caches_[i]; 2853 break; 2854 } 2855 } 2856 } 2857 CHECK(dex_cache != NULL); 2858 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2859 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2860 CHECK(resolved_method != NULL); 2861 return resolved_method; 2862} 2863 2864 2865mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2866 const SirtRef<mirror::Class>& klass, 2867 mirror::Class* proxy_class) { 2868 // Create constructor for Proxy that must initialize h 2869 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2870 proxy_class->GetDirectMethods(); 2871 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2872 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2873 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2874 // code_ too) 2875 mirror::ArtMethod* constructor = 2876 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2877 if (constructor == NULL) { 2878 CHECK(self->IsExceptionPending()); // OOME. 2879 return NULL; 2880 } 2881 // Make this constructor public and fix the class to be our Proxy version 2882 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2883 constructor->SetDeclaringClass(klass.get()); 2884 return constructor; 2885} 2886 2887static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2888 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2889 CHECK(constructor->IsConstructor()); 2890 MethodHelper mh(constructor); 2891 CHECK_STREQ(mh.GetName(), "<init>"); 2892 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2893 DCHECK(constructor->IsPublic()); 2894} 2895 2896mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2897 const SirtRef<mirror::Class>& klass, 2898 const SirtRef<mirror::ArtMethod>& prototype) { 2899 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2900 // prototype method 2901 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2902 prototype.get()); 2903 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2904 // as necessary 2905 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2906 if (UNLIKELY(method == NULL)) { 2907 CHECK(self->IsExceptionPending()); // OOME. 2908 return NULL; 2909 } 2910 2911 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2912 // the intersection of throw exceptions as defined in Proxy 2913 method->SetDeclaringClass(klass.get()); 2914 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2915 2916 // At runtime the method looks like a reference and argument saving method, clone the code 2917 // related parameters from this method. 2918 mirror::ArtMethod* refs_and_args = 2919 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2920 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2921 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2922 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2923 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2924 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2925 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2926 2927 return method; 2928} 2929 2930static void CheckProxyMethod(mirror::ArtMethod* method, 2931 SirtRef<mirror::ArtMethod>& prototype) 2932 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2933 // Basic sanity 2934 CHECK(!prototype->IsFinal()); 2935 CHECK(method->IsFinal()); 2936 CHECK(!method->IsAbstract()); 2937 2938 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2939 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2940 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2941 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2942 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2943 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2944 2945 MethodHelper mh(method); 2946 MethodHelper mh2(prototype.get()); 2947 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2948 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2949 // More complex sanity - via dex cache 2950 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2951} 2952 2953static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2954 bool can_init_parents) 2955 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2956 if (can_init_statics && can_init_parents) { 2957 return true; 2958 } 2959 if (!can_init_statics) { 2960 // Check if there's a class initializer. 2961 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2962 if (clinit != NULL) { 2963 return false; 2964 } 2965 // Check if there are encoded static values needing initialization. 2966 if (klass->NumStaticFields() != 0) { 2967 ClassHelper kh(klass); 2968 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2969 DCHECK(dex_class_def != NULL); 2970 if (dex_class_def->static_values_off_ != 0) { 2971 return false; 2972 } 2973 } 2974 } 2975 if (!klass->IsInterface() && klass->HasSuperClass()) { 2976 mirror::Class* super_class = klass->GetSuperClass(); 2977 if (!can_init_parents && !super_class->IsInitialized()) { 2978 return false; 2979 } else { 2980 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 2981 return false; 2982 } 2983 } 2984 } 2985 return true; 2986} 2987 2988bool ClassLinker::IsInitialized() const { 2989 return init_done_; 2990} 2991 2992bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 2993 bool can_init_parents) { 2994 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2995 2996 // Are we already initialized and therefore done? 2997 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2998 // an initialized class will never change its state. 2999 if (klass->IsInitialized()) { 3000 return true; 3001 } 3002 3003 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3004 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3005 return false; 3006 } 3007 3008 Thread* self = Thread::Current(); 3009 uint64_t t0; 3010 { 3011 ObjectLock<mirror::Class> lock(self, &klass); 3012 3013 // Re-check under the lock in case another thread initialized ahead of us. 3014 if (klass->IsInitialized()) { 3015 return true; 3016 } 3017 3018 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3019 if (klass->IsErroneous()) { 3020 ThrowEarlierClassFailure(klass.get()); 3021 return false; 3022 } 3023 3024 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3025 3026 if (!klass->IsVerified()) { 3027 VerifyClass(klass); 3028 if (!klass->IsVerified()) { 3029 // We failed to verify, expect either the klass to be erroneous or verification failed at 3030 // compile time. 3031 if (klass->IsErroneous()) { 3032 CHECK(self->IsExceptionPending()); 3033 } else { 3034 CHECK(Runtime::Current()->IsCompiler()); 3035 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3036 } 3037 return false; 3038 } 3039 } 3040 3041 // If the class is kStatusInitializing, either this thread is 3042 // initializing higher up the stack or another thread has beat us 3043 // to initializing and we need to wait. Either way, this 3044 // invocation of InitializeClass will not be responsible for 3045 // running <clinit> and will return. 3046 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3047 // We caught somebody else in the act; was it us? 3048 if (klass->GetClinitThreadId() == self->GetTid()) { 3049 // Yes. That's fine. Return so we can continue initializing. 3050 return true; 3051 } 3052 // No. That's fine. Wait for another thread to finish initializing. 3053 return WaitForInitializeClass(klass, self, lock); 3054 } 3055 3056 if (!ValidateSuperClassDescriptors(klass)) { 3057 klass->SetStatus(mirror::Class::kStatusError, self); 3058 return false; 3059 } 3060 3061 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3062 3063 // From here out other threads may observe that we're initializing and so changes of state 3064 // require the a notification. 3065 klass->SetClinitThreadId(self->GetTid()); 3066 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3067 3068 t0 = NanoTime(); 3069 } 3070 3071 // Initialize super classes, must be done while initializing for the JLS. 3072 if (!klass->IsInterface() && klass->HasSuperClass()) { 3073 mirror::Class* super_class = klass->GetSuperClass(); 3074 if (!super_class->IsInitialized()) { 3075 CHECK(!super_class->IsInterface()); 3076 CHECK(can_init_parents); 3077 SirtRef<mirror::Class> sirt_super(self, super_class); 3078 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3079 if (!super_initialized) { 3080 // The super class was verified ahead of entering initializing, we should only be here if 3081 // the super class became erroneous due to initialization. 3082 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3083 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3084 << " that has unexpected status " << sirt_super->GetStatus() 3085 << "\nPending exception:\n" 3086 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3087 ObjectLock<mirror::Class> lock(self, &klass); 3088 // Initialization failed because the super-class is erroneous. 3089 klass->SetStatus(mirror::Class::kStatusError, self); 3090 return false; 3091 } 3092 } 3093 } 3094 3095 if (klass->NumStaticFields() > 0) { 3096 ClassHelper kh(klass.get()); 3097 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3098 CHECK(dex_class_def != NULL); 3099 const DexFile& dex_file = kh.GetDexFile(); 3100 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3101 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3102 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3103 this, *dex_class_def); 3104 if (it.HasNext()) { 3105 CHECK(can_init_statics); 3106 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3107 SafeMap<uint32_t, mirror::ArtField*> field_map; 3108 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3109 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3110 if (Runtime::Current()->IsActiveTransaction()) { 3111 it.ReadValueToField<true>(field_map.Get(i)); 3112 } else { 3113 it.ReadValueToField<false>(field_map.Get(i)); 3114 } 3115 } 3116 } 3117 } 3118 3119 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3120 if (clinit != NULL) { 3121 CHECK(can_init_statics); 3122 if (LIKELY(Runtime::Current()->IsStarted())) { 3123 JValue result; 3124 clinit->Invoke(self, NULL, 0, &result, "V"); 3125 } else { 3126 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3127 } 3128 } 3129 3130 uint64_t t1 = NanoTime(); 3131 3132 bool success = true; 3133 { 3134 ObjectLock<mirror::Class> lock(self, &klass); 3135 3136 if (self->IsExceptionPending()) { 3137 WrapExceptionInInitializer(); 3138 klass->SetStatus(mirror::Class::kStatusError, self); 3139 success = false; 3140 } else { 3141 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3142 RuntimeStats* thread_stats = self->GetStats(); 3143 ++global_stats->class_init_count; 3144 ++thread_stats->class_init_count; 3145 global_stats->class_init_time_ns += (t1 - t0); 3146 thread_stats->class_init_time_ns += (t1 - t0); 3147 // Set the class as initialized except if failed to initialize static fields. 3148 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3149 if (VLOG_IS_ON(class_linker)) { 3150 ClassHelper kh(klass.get()); 3151 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3152 } 3153 // Opportunistically set static method trampolines to their destination. 3154 FixupStaticTrampolines(klass.get()); 3155 } 3156 } 3157 return success; 3158} 3159 3160bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3161 ObjectLock<mirror::Class>& lock) 3162 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3163 while (true) { 3164 self->AssertNoPendingException(); 3165 CHECK(!klass->IsInitialized()); 3166 lock.WaitIgnoringInterrupts(); 3167 3168 // When we wake up, repeat the test for init-in-progress. If 3169 // there's an exception pending (only possible if 3170 // "interruptShouldThrow" was set), bail out. 3171 if (self->IsExceptionPending()) { 3172 WrapExceptionInInitializer(); 3173 klass->SetStatus(mirror::Class::kStatusError, self); 3174 return false; 3175 } 3176 // Spurious wakeup? Go back to waiting. 3177 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3178 continue; 3179 } 3180 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3181 // Compile time initialization failed. 3182 return false; 3183 } 3184 if (klass->IsErroneous()) { 3185 // The caller wants an exception, but it was thrown in a 3186 // different thread. Synthesize one here. 3187 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3188 PrettyDescriptor(klass.get()).c_str()); 3189 return false; 3190 } 3191 if (klass->IsInitialized()) { 3192 return true; 3193 } 3194 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3195 << klass->GetStatus(); 3196 } 3197 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3198} 3199 3200bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3201 if (klass->IsInterface()) { 3202 return true; 3203 } 3204 Thread* self = Thread::Current(); 3205 // begin with the methods local to the superclass 3206 if (klass->HasSuperClass() && 3207 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3208 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3209 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3210 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3211 if (method != super->GetVTable()->Get(i) && 3212 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3213 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3214 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3215 PrettyDescriptor(super.get()).c_str()); 3216 return false; 3217 } 3218 } 3219 } 3220 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3221 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3222 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3223 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3224 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3225 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3226 method->GetDeclaringClass())) { 3227 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3228 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3229 PrettyMethod(method).c_str(), 3230 PrettyDescriptor(interface.get()).c_str()); 3231 return false; 3232 } 3233 } 3234 } 3235 } 3236 return true; 3237} 3238 3239// Returns true if classes referenced by the signature of the method are the 3240// same classes in klass1 as they are in klass2. 3241bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3242 mirror::ArtMethod* method, 3243 mirror::Class* klass1, 3244 mirror::Class* klass2) { 3245 if (klass1 == klass2) { 3246 return true; 3247 } 3248 CHECK(klass1 != nullptr); 3249 CHECK(klass2 != nullptr); 3250 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3251 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3252 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3253 const DexFile::ProtoId& proto_id = 3254 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3255 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3256 const char* descriptor = it.GetDescriptor(); 3257 if (descriptor == nullptr) { 3258 break; 3259 } 3260 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3261 // Found a non-primitive type. 3262 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3263 return false; 3264 } 3265 } 3266 } 3267 // Check the return type 3268 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3269 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3270 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3271 return false; 3272 } 3273 } 3274 return true; 3275} 3276 3277// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3278bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3279 SirtRef<mirror::ClassLoader>& loader1, 3280 SirtRef<mirror::ClassLoader>& loader2) { 3281 CHECK(descriptor != nullptr); 3282 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3283 if (found1.get() == nullptr) { 3284 self->ClearException(); 3285 } 3286 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3287 if (found2 == nullptr) { 3288 self->ClearException(); 3289 } 3290 return found1.get() == found2; 3291} 3292 3293bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3294 bool can_init_parents) { 3295 DCHECK(c.get() != NULL); 3296 if (c->IsInitialized()) { 3297 return true; 3298 } 3299 3300 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3301 if (!success) { 3302 if (can_init_fields && can_init_parents) { 3303 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3304 } 3305 } 3306 return success; 3307} 3308 3309void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3310 mirror::Class* c, 3311 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3312 const byte* class_data = dex_file.GetClassData(dex_class_def); 3313 ClassDataItemIterator it(dex_file, class_data); 3314 Thread* self = Thread::Current(); 3315 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3316 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3317 CHECK(!kMovingFields); 3318 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3319 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3320 } 3321} 3322 3323bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3324 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3325 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3326 if (!LinkSuperClass(klass)) { 3327 return false; 3328 } 3329 if (!LinkMethods(klass, interfaces)) { 3330 return false; 3331 } 3332 if (!LinkInstanceFields(klass)) { 3333 return false; 3334 } 3335 if (!LinkStaticFields(klass)) { 3336 return false; 3337 } 3338 CreateReferenceInstanceOffsets(klass); 3339 CreateReferenceStaticOffsets(klass); 3340 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3341 klass->SetStatus(mirror::Class::kStatusResolved, self); 3342 return true; 3343} 3344 3345bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3346 const DexFile& dex_file) { 3347 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3348 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3349 uint16_t super_class_idx = class_def.superclass_idx_; 3350 if (super_class_idx != DexFile::kDexNoIndex16) { 3351 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3352 if (super_class == NULL) { 3353 DCHECK(Thread::Current()->IsExceptionPending()); 3354 return false; 3355 } 3356 // Verify 3357 if (!klass->CanAccess(super_class)) { 3358 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3359 PrettyDescriptor(super_class).c_str(), 3360 PrettyDescriptor(klass.get()).c_str()); 3361 return false; 3362 } 3363 klass->SetSuperClass(super_class); 3364 } 3365 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3366 if (interfaces != NULL) { 3367 for (size_t i = 0; i < interfaces->Size(); i++) { 3368 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3369 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3370 if (interface == NULL) { 3371 DCHECK(Thread::Current()->IsExceptionPending()); 3372 return false; 3373 } 3374 // Verify 3375 if (!klass->CanAccess(interface)) { 3376 // TODO: the RI seemed to ignore this in my testing. 3377 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3378 PrettyDescriptor(interface).c_str(), 3379 PrettyDescriptor(klass.get()).c_str()); 3380 return false; 3381 } 3382 } 3383 } 3384 // Mark the class as loaded. 3385 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3386 return true; 3387} 3388 3389bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3390 CHECK(!klass->IsPrimitive()); 3391 mirror::Class* super = klass->GetSuperClass(); 3392 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3393 if (super != NULL) { 3394 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3395 return false; 3396 } 3397 return true; 3398 } 3399 if (super == NULL) { 3400 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3401 PrettyDescriptor(klass.get()).c_str()); 3402 return false; 3403 } 3404 // Verify 3405 if (super->IsFinal() || super->IsInterface()) { 3406 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3407 PrettyDescriptor(super).c_str(), 3408 PrettyDescriptor(klass.get()).c_str(), 3409 super->IsFinal() ? "declared final" : "an interface"); 3410 return false; 3411 } 3412 if (!klass->CanAccess(super)) { 3413 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3414 PrettyDescriptor(super).c_str(), 3415 PrettyDescriptor(klass.get()).c_str()); 3416 return false; 3417 } 3418 3419 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3420 if (super->IsFinalizable()) { 3421 klass->SetFinalizable(); 3422 } 3423 3424 // Inherit reference flags (if any) from the superclass. 3425 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3426 if (reference_flags != 0) { 3427 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3428 } 3429 // Disallow custom direct subclasses of java.lang.ref.Reference. 3430 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3431 ThrowLinkageError(klass.get(), 3432 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3433 PrettyDescriptor(klass.get()).c_str()); 3434 return false; 3435 } 3436 3437 if (kIsDebugBuild) { 3438 // Ensure super classes are fully resolved prior to resolving fields.. 3439 while (super != NULL) { 3440 CHECK(super->IsResolved()); 3441 super = super->GetSuperClass(); 3442 } 3443 } 3444 return true; 3445} 3446 3447// Populate the class vtable and itable. Compute return type indices. 3448bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3449 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3450 if (klass->IsInterface()) { 3451 // No vtable. 3452 size_t count = klass->NumVirtualMethods(); 3453 if (!IsUint(16, count)) { 3454 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3455 return false; 3456 } 3457 for (size_t i = 0; i < count; ++i) { 3458 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3459 } 3460 // Link interface method tables 3461 return LinkInterfaceMethods(klass, interfaces); 3462 } else { 3463 // Link virtual and interface method tables 3464 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3465 } 3466 return true; 3467} 3468 3469bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3470 Thread* self = Thread::Current(); 3471 if (klass->HasSuperClass()) { 3472 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3473 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3474 CHECK_LE(actual_count, max_count); 3475 // TODO: do not assign to the vtable field until it is fully constructed. 3476 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3477 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3478 if (UNLIKELY(vtable.get() == NULL)) { 3479 CHECK(self->IsExceptionPending()); // OOME. 3480 return false; 3481 } 3482 // See if any of our virtual methods override the superclass. 3483 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3484 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3485 MethodHelper local_mh(local_method); 3486 size_t j = 0; 3487 for (; j < actual_count; ++j) { 3488 mirror::ArtMethod* super_method = vtable->Get(j); 3489 MethodHelper super_mh(super_method); 3490 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3491 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3492 if (super_method->IsFinal()) { 3493 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3494 PrettyMethod(local_method).c_str(), 3495 super_mh.GetDeclaringClassDescriptor()); 3496 return false; 3497 } 3498 vtable->Set<false>(j, local_method); 3499 local_method->SetMethodIndex(j); 3500 break; 3501 } else { 3502 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3503 << " would have incorrectly overridden the package-private method in " 3504 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3505 } 3506 } 3507 } 3508 if (j == actual_count) { 3509 // Not overriding, append. 3510 vtable->Set<false>(actual_count, local_method); 3511 local_method->SetMethodIndex(actual_count); 3512 actual_count += 1; 3513 } 3514 } 3515 if (!IsUint(16, actual_count)) { 3516 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3517 return false; 3518 } 3519 // Shrink vtable if possible 3520 CHECK_LE(actual_count, max_count); 3521 if (actual_count < max_count) { 3522 vtable.reset(vtable->CopyOf(self, actual_count)); 3523 if (UNLIKELY(vtable.get() == NULL)) { 3524 CHECK(self->IsExceptionPending()); // OOME. 3525 return false; 3526 } 3527 } 3528 klass->SetVTable(vtable.get()); 3529 } else { 3530 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3531 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3532 if (!IsUint(16, num_virtual_methods)) { 3533 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3534 return false; 3535 } 3536 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3537 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3538 if (UNLIKELY(vtable.get() == NULL)) { 3539 CHECK(self->IsExceptionPending()); // OOME. 3540 return false; 3541 } 3542 for (size_t i = 0; i < num_virtual_methods; ++i) { 3543 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3544 vtable->Set<false>(i, virtual_method); 3545 virtual_method->SetMethodIndex(i & 0xFFFF); 3546 } 3547 klass->SetVTable(vtable.get()); 3548 } 3549 return true; 3550} 3551 3552bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3553 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3554 // Set the imt table to be all conflicts by default. 3555 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3556 size_t super_ifcount; 3557 if (klass->HasSuperClass()) { 3558 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3559 } else { 3560 super_ifcount = 0; 3561 } 3562 size_t ifcount = super_ifcount; 3563 uint32_t num_interfaces; 3564 { 3565 ClassHelper kh(klass.get()); 3566 num_interfaces = 3567 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3568 ifcount += num_interfaces; 3569 for (size_t i = 0; i < num_interfaces; i++) { 3570 mirror::Class* interface = 3571 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3572 ifcount += interface->GetIfTableCount(); 3573 } 3574 } 3575 if (ifcount == 0) { 3576 // Class implements no interfaces. 3577 DCHECK_EQ(klass->GetIfTableCount(), 0); 3578 DCHECK(klass->GetIfTable() == NULL); 3579 return true; 3580 } 3581 if (ifcount == super_ifcount) { 3582 // Class implements same interfaces as parent, are any of these not marker interfaces? 3583 bool has_non_marker_interface = false; 3584 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3585 for (size_t i = 0; i < ifcount; ++i) { 3586 if (super_iftable->GetMethodArrayCount(i) > 0) { 3587 has_non_marker_interface = true; 3588 break; 3589 } 3590 } 3591 if (!has_non_marker_interface) { 3592 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3593 klass->SetIfTable(super_iftable); 3594 return true; 3595 } 3596 } 3597 Thread* self = Thread::Current(); 3598 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3599 if (UNLIKELY(iftable.get() == NULL)) { 3600 CHECK(self->IsExceptionPending()); // OOME. 3601 return false; 3602 } 3603 if (super_ifcount != 0) { 3604 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3605 for (size_t i = 0; i < super_ifcount; i++) { 3606 mirror::Class* super_interface = super_iftable->GetInterface(i); 3607 iftable->SetInterface(i, super_interface); 3608 } 3609 } 3610 // Flatten the interface inheritance hierarchy. 3611 size_t idx = super_ifcount; 3612 for (size_t i = 0; i < num_interfaces; i++) { 3613 ClassHelper kh(klass.get()); 3614 mirror::Class* interface = 3615 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3616 DCHECK(interface != NULL); 3617 if (!interface->IsInterface()) { 3618 ClassHelper ih(interface); 3619 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3620 PrettyDescriptor(klass.get()).c_str(), 3621 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3622 return false; 3623 } 3624 // Check if interface is already in iftable 3625 bool duplicate = false; 3626 for (size_t j = 0; j < idx; j++) { 3627 mirror::Class* existing_interface = iftable->GetInterface(j); 3628 if (existing_interface == interface) { 3629 duplicate = true; 3630 break; 3631 } 3632 } 3633 if (!duplicate) { 3634 // Add this non-duplicate interface. 3635 iftable->SetInterface(idx++, interface); 3636 // Add this interface's non-duplicate super-interfaces. 3637 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3638 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3639 bool super_duplicate = false; 3640 for (size_t k = 0; k < idx; k++) { 3641 mirror::Class* existing_interface = iftable->GetInterface(k); 3642 if (existing_interface == super_interface) { 3643 super_duplicate = true; 3644 break; 3645 } 3646 } 3647 if (!super_duplicate) { 3648 iftable->SetInterface(idx++, super_interface); 3649 } 3650 } 3651 } 3652 } 3653 // Shrink iftable in case duplicates were found 3654 if (idx < ifcount) { 3655 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3656 if (UNLIKELY(iftable.get() == NULL)) { 3657 CHECK(self->IsExceptionPending()); // OOME. 3658 return false; 3659 } 3660 ifcount = idx; 3661 } else { 3662 CHECK_EQ(idx, ifcount); 3663 } 3664 klass->SetIfTable(iftable.get()); 3665 3666 // If we're an interface, we don't need the vtable pointers, so we're done. 3667 if (klass->IsInterface()) { 3668 return true; 3669 } 3670 // Allocate imtable 3671 bool imtable_changed = false; 3672 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3673 if (UNLIKELY(imtable.get() == NULL)) { 3674 CHECK(self->IsExceptionPending()); // OOME. 3675 return false; 3676 } 3677 std::vector<mirror::ArtMethod*> miranda_list; 3678 for (size_t i = 0; i < ifcount; ++i) { 3679 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3680 if (num_methods > 0) { 3681 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3682 method_array(self, AllocArtMethodArray(self, num_methods)); 3683 if (UNLIKELY(method_array.get() == nullptr)) { 3684 CHECK(self->IsExceptionPending()); // OOME. 3685 return false; 3686 } 3687 iftable->SetMethodArray(i, method_array.get()); 3688 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3689 klass->GetVTableDuringLinking()); 3690 for (size_t j = 0; j < num_methods; ++j) { 3691 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3692 MethodHelper interface_mh(interface_method); 3693 int32_t k; 3694 // For each method listed in the interface's method list, find the 3695 // matching method in our class's method list. We want to favor the 3696 // subclass over the superclass, which just requires walking 3697 // back from the end of the vtable. (This only matters if the 3698 // superclass defines a private method and this class redefines 3699 // it -- otherwise it would use the same vtable slot. In .dex files 3700 // those don't end up in the virtual method table, so it shouldn't 3701 // matter which direction we go. We walk it backward anyway.) 3702 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3703 mirror::ArtMethod* vtable_method = vtable->Get(k); 3704 MethodHelper vtable_mh(vtable_method); 3705 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3706 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3707 ThrowIllegalAccessError(klass.get(), 3708 "Method '%s' implementing interface method '%s' is not public", 3709 PrettyMethod(vtable_method).c_str(), 3710 PrettyMethod(interface_method).c_str()); 3711 return false; 3712 } 3713 method_array->Set<false>(j, vtable_method); 3714 // Place method in imt if entry is empty, place conflict otherwise. 3715 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3716 if (imtable->Get(imt_index) == NULL) { 3717 imtable->Set<false>(imt_index, vtable_method); 3718 imtable_changed = true; 3719 } else { 3720 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3721 } 3722 break; 3723 } 3724 } 3725 if (k < 0) { 3726 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3727 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3728 mirror::ArtMethod* mir_method = miranda_list[mir]; 3729 MethodHelper vtable_mh(mir_method); 3730 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3731 miranda_method.reset(miranda_list[mir]); 3732 break; 3733 } 3734 } 3735 if (miranda_method.get() == NULL) { 3736 // Point the interface table at a phantom slot. 3737 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3738 if (UNLIKELY(miranda_method.get() == NULL)) { 3739 CHECK(self->IsExceptionPending()); // OOME. 3740 return false; 3741 } 3742 // TODO: If a methods move then the miranda_list may hold stale references. 3743 miranda_list.push_back(miranda_method.get()); 3744 } 3745 method_array->Set<false>(j, miranda_method.get()); 3746 } 3747 } 3748 } 3749 } 3750 if (imtable_changed) { 3751 // Fill in empty entries in interface method table with conflict. 3752 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3753 for (size_t i = 0; i < kImtSize; i++) { 3754 if (imtable->Get(i) == NULL) { 3755 imtable->Set<false>(i, imt_conflict_method); 3756 } 3757 } 3758 klass->SetImTable(imtable.get()); 3759 } 3760 if (!miranda_list.empty()) { 3761 int old_method_count = klass->NumVirtualMethods(); 3762 int new_method_count = old_method_count + miranda_list.size(); 3763 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3764 if (old_method_count == 0) { 3765 virtuals = AllocArtMethodArray(self, new_method_count); 3766 } else { 3767 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3768 } 3769 if (UNLIKELY(virtuals == NULL)) { 3770 CHECK(self->IsExceptionPending()); // OOME. 3771 return false; 3772 } 3773 klass->SetVirtualMethods(virtuals); 3774 3775 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3776 vtable(self, klass->GetVTableDuringLinking()); 3777 CHECK(vtable.get() != NULL); 3778 int old_vtable_count = vtable->GetLength(); 3779 int new_vtable_count = old_vtable_count + miranda_list.size(); 3780 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3781 if (UNLIKELY(vtable.get() == NULL)) { 3782 CHECK(self->IsExceptionPending()); // OOME. 3783 return false; 3784 } 3785 for (size_t i = 0; i < miranda_list.size(); ++i) { 3786 mirror::ArtMethod* method = miranda_list[i]; 3787 // Leave the declaring class alone as type indices are relative to it 3788 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3789 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3790 klass->SetVirtualMethod(old_method_count + i, method); 3791 vtable->Set<false>(old_vtable_count + i, method); 3792 } 3793 // TODO: do not assign to the vtable field until it is fully constructed. 3794 klass->SetVTable(vtable.get()); 3795 } 3796 3797 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3798 for (int i = 0; i < vtable->GetLength(); ++i) { 3799 CHECK(vtable->Get(i) != NULL); 3800 } 3801 3802// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3803 3804 return true; 3805} 3806 3807bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3808 CHECK(klass.get() != NULL); 3809 return LinkFields(klass, false); 3810} 3811 3812bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3813 CHECK(klass.get() != NULL); 3814 size_t allocated_class_size = klass->GetClassSize(); 3815 bool success = LinkFields(klass, true); 3816 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3817 return success; 3818} 3819 3820struct LinkFieldsComparator { 3821 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3822 } 3823 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3824 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3825 NO_THREAD_SAFETY_ANALYSIS { 3826 // First come reference fields, then 64-bit, and finally 32-bit 3827 FieldHelper fh1(field1); 3828 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3829 FieldHelper fh2(field2); 3830 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3831 if (type1 != type2) { 3832 bool is_primitive1 = type1 != Primitive::kPrimNot; 3833 bool is_primitive2 = type2 != Primitive::kPrimNot; 3834 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3835 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3836 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3837 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3838 if (order1 != order2) { 3839 return order1 < order2; 3840 } 3841 } 3842 // same basic group? then sort by string. 3843 const char* name1 = fh1.GetName(); 3844 const char* name2 = fh2.GetName(); 3845 return strcmp(name1, name2) < 0; 3846 } 3847}; 3848 3849bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3850 size_t num_fields = 3851 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3852 3853 mirror::ObjectArray<mirror::ArtField>* fields = 3854 is_static ? klass->GetSFields() : klass->GetIFields(); 3855 3856 // Initialize size and field_offset 3857 size_t size; 3858 MemberOffset field_offset(0); 3859 if (is_static) { 3860 size = klass->GetClassSize(); 3861 field_offset = mirror::Class::FieldsOffset(); 3862 } else { 3863 mirror::Class* super_class = klass->GetSuperClass(); 3864 if (super_class != NULL) { 3865 CHECK(super_class->IsResolved()); 3866 field_offset = MemberOffset(super_class->GetObjectSize()); 3867 } 3868 size = field_offset.Uint32Value(); 3869 } 3870 3871 CHECK_EQ(num_fields == 0, fields == NULL); 3872 3873 // we want a relatively stable order so that adding new fields 3874 // minimizes disruption of C++ version such as Class and Method. 3875 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3876 for (size_t i = 0; i < num_fields; i++) { 3877 mirror::ArtField* f = fields->Get(i); 3878 CHECK(f != NULL); 3879 grouped_and_sorted_fields.push_back(f); 3880 } 3881 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3882 LinkFieldsComparator()); 3883 3884 // References should be at the front. 3885 size_t current_field = 0; 3886 size_t num_reference_fields = 0; 3887 for (; current_field < num_fields; current_field++) { 3888 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3889 FieldHelper fh(field); 3890 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3891 bool isPrimitive = type != Primitive::kPrimNot; 3892 if (isPrimitive) { 3893 break; // past last reference, move on to the next phase 3894 } 3895 grouped_and_sorted_fields.pop_front(); 3896 num_reference_fields++; 3897 fields->Set<false>(current_field, field); 3898 field->SetOffset(field_offset); 3899 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3900 } 3901 3902 // Now we want to pack all of the double-wide fields together. If 3903 // we're not aligned, though, we want to shuffle one 32-bit field 3904 // into place. If we can't find one, we'll have to pad it. 3905 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3906 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3907 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3908 FieldHelper fh(field); 3909 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3910 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3911 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3912 continue; 3913 } 3914 fields->Set<false>(current_field++, field); 3915 field->SetOffset(field_offset); 3916 // drop the consumed field 3917 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3918 break; 3919 } 3920 // whether we found a 32-bit field for padding or not, we advance 3921 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3922 } 3923 3924 // Alignment is good, shuffle any double-wide fields forward, and 3925 // finish assigning field offsets to all fields. 3926 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3927 while (!grouped_and_sorted_fields.empty()) { 3928 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3929 grouped_and_sorted_fields.pop_front(); 3930 FieldHelper fh(field); 3931 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3932 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3933 fields->Set<false>(current_field, field); 3934 field->SetOffset(field_offset); 3935 field_offset = MemberOffset(field_offset.Uint32Value() + 3936 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3937 ? sizeof(uint64_t) 3938 : sizeof(uint32_t))); 3939 current_field++; 3940 } 3941 3942 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3943 if (!is_static && 3944 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3945 // We know there are no non-reference fields in the Reference classes, and we know 3946 // that 'referent' is alphabetically last, so this is easy... 3947 CHECK_EQ(num_reference_fields, num_fields); 3948 FieldHelper fh(fields->Get(num_fields - 1)); 3949 CHECK_STREQ(fh.GetName(), "referent"); 3950 --num_reference_fields; 3951 } 3952 3953 if (kIsDebugBuild) { 3954 // Make sure that all reference fields appear before 3955 // non-reference fields, and all double-wide fields are aligned. 3956 bool seen_non_ref = false; 3957 for (size_t i = 0; i < num_fields; i++) { 3958 mirror::ArtField* field = fields->Get(i); 3959 if (false) { // enable to debug field layout 3960 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3961 << " class=" << PrettyClass(klass.get()) 3962 << " field=" << PrettyField(field) 3963 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3964 false); 3965 } 3966 FieldHelper fh(field); 3967 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3968 bool is_primitive = type != Primitive::kPrimNot; 3969 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 3970 && (strcmp("referent", fh.GetName()) == 0)) { 3971 is_primitive = true; // We lied above, so we have to expect a lie here. 3972 } 3973 if (is_primitive) { 3974 if (!seen_non_ref) { 3975 seen_non_ref = true; 3976 DCHECK_EQ(num_reference_fields, i); 3977 } 3978 } else { 3979 DCHECK(!seen_non_ref); 3980 } 3981 } 3982 if (!seen_non_ref) { 3983 DCHECK_EQ(num_fields, num_reference_fields); 3984 } 3985 } 3986 size = field_offset.Uint32Value(); 3987 // Update klass 3988 if (is_static) { 3989 klass->SetNumReferenceStaticFields(num_reference_fields); 3990 klass->SetClassSize(size); 3991 } else { 3992 klass->SetNumReferenceInstanceFields(num_reference_fields); 3993 if (!klass->IsVariableSize()) { 3994 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 3995 size_t previous_size = klass->GetObjectSize(); 3996 if (previous_size != 0) { 3997 // Make sure that we didn't originally have an incorrect size. 3998 CHECK_EQ(previous_size, size); 3999 } 4000 klass->SetObjectSize(size); 4001 } 4002 } 4003 return true; 4004} 4005 4006// Set the bitmap of reference offsets, refOffsets, from the ifields 4007// list. 4008void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4009 uint32_t reference_offsets = 0; 4010 mirror::Class* super_class = klass->GetSuperClass(); 4011 if (super_class != NULL) { 4012 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4013 // If our superclass overflowed, we don't stand a chance. 4014 if (reference_offsets == CLASS_WALK_SUPER) { 4015 klass->SetReferenceInstanceOffsets(reference_offsets); 4016 return; 4017 } 4018 } 4019 CreateReferenceOffsets(klass, false, reference_offsets); 4020} 4021 4022void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4023 CreateReferenceOffsets(klass, true, 0); 4024} 4025 4026void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4027 uint32_t reference_offsets) { 4028 size_t num_reference_fields = 4029 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4030 : klass->NumReferenceInstanceFieldsDuringLinking(); 4031 mirror::ObjectArray<mirror::ArtField>* fields = 4032 is_static ? klass->GetSFields() : klass->GetIFields(); 4033 // All of the fields that contain object references are guaranteed 4034 // to be at the beginning of the fields list. 4035 for (size_t i = 0; i < num_reference_fields; ++i) { 4036 // Note that byte_offset is the offset from the beginning of 4037 // object, not the offset into instance data 4038 mirror::ArtField* field = fields->Get(i); 4039 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4040 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4041 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4042 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4043 CHECK_NE(new_bit, 0U); 4044 reference_offsets |= new_bit; 4045 } else { 4046 reference_offsets = CLASS_WALK_SUPER; 4047 break; 4048 } 4049 } 4050 // Update fields in klass 4051 if (is_static) { 4052 klass->SetReferenceStaticOffsets(reference_offsets); 4053 } else { 4054 klass->SetReferenceInstanceOffsets(reference_offsets); 4055 } 4056} 4057 4058mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4059 const SirtRef<mirror::DexCache>& dex_cache) { 4060 DCHECK(dex_cache.get() != nullptr); 4061 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4062 if (resolved != NULL) { 4063 return resolved; 4064 } 4065 uint32_t utf16_length; 4066 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4067 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4068 dex_cache->SetResolvedString(string_idx, string); 4069 return string; 4070} 4071 4072mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4073 mirror::Class* referrer) { 4074 Thread* self = Thread::Current(); 4075 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4076 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4077 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4078} 4079 4080mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4081 const SirtRef<mirror::DexCache>& dex_cache, 4082 const SirtRef<mirror::ClassLoader>& class_loader) { 4083 DCHECK(dex_cache.get() != NULL); 4084 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4085 if (resolved == NULL) { 4086 Thread* self = Thread::Current(); 4087 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4088 resolved = FindClass(self, descriptor, class_loader); 4089 if (resolved != NULL) { 4090 // TODO: we used to throw here if resolved's class loader was not the 4091 // boot class loader. This was to permit different classes with the 4092 // same name to be loaded simultaneously by different loaders 4093 dex_cache->SetResolvedType(type_idx, resolved); 4094 } else { 4095 CHECK(self->IsExceptionPending()) 4096 << "Expected pending exception for failed resolution of: " << descriptor; 4097 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4098 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4099 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4100 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4101 self->ClearException(); 4102 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4103 self->GetException(NULL)->SetCause(cause.get()); 4104 } 4105 } 4106 } 4107 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4108 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4109 return resolved; 4110} 4111 4112mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4113 uint32_t method_idx, 4114 const SirtRef<mirror::DexCache>& dex_cache, 4115 const SirtRef<mirror::ClassLoader>& class_loader, 4116 mirror::ArtMethod* referrer, 4117 InvokeType type) { 4118 DCHECK(dex_cache.get() != NULL); 4119 // Check for hit in the dex cache. 4120 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4121 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4122 return resolved; 4123 } 4124 // Fail, get the declaring class. 4125 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4126 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4127 if (klass == NULL) { 4128 DCHECK(Thread::Current()->IsExceptionPending()); 4129 return NULL; 4130 } 4131 // Scan using method_idx, this saves string compares but will only hit for matching dex 4132 // caches/files. 4133 switch (type) { 4134 case kDirect: // Fall-through. 4135 case kStatic: 4136 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4137 break; 4138 case kInterface: 4139 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4140 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4141 break; 4142 case kSuper: // Fall-through. 4143 case kVirtual: 4144 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4145 break; 4146 default: 4147 LOG(FATAL) << "Unreachable - invocation type: " << type; 4148 } 4149 if (resolved == NULL) { 4150 // Search by name, which works across dex files. 4151 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4152 const Signature signature = dex_file.GetMethodSignature(method_id); 4153 switch (type) { 4154 case kDirect: // Fall-through. 4155 case kStatic: 4156 resolved = klass->FindDirectMethod(name, signature); 4157 break; 4158 case kInterface: 4159 resolved = klass->FindInterfaceMethod(name, signature); 4160 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4161 break; 4162 case kSuper: // Fall-through. 4163 case kVirtual: 4164 resolved = klass->FindVirtualMethod(name, signature); 4165 break; 4166 } 4167 } 4168 if (resolved != NULL) { 4169 // We found a method, check for incompatible class changes. 4170 if (resolved->CheckIncompatibleClassChange(type)) { 4171 resolved = NULL; 4172 } 4173 } 4174 if (resolved != NULL) { 4175 // Be a good citizen and update the dex cache to speed subsequent calls. 4176 dex_cache->SetResolvedMethod(method_idx, resolved); 4177 return resolved; 4178 } else { 4179 // We failed to find the method which means either an access error, an incompatible class 4180 // change, or no such method. First try to find the method among direct and virtual methods. 4181 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4182 const Signature signature = dex_file.GetMethodSignature(method_id); 4183 switch (type) { 4184 case kDirect: 4185 case kStatic: 4186 resolved = klass->FindVirtualMethod(name, signature); 4187 break; 4188 case kInterface: 4189 case kVirtual: 4190 case kSuper: 4191 resolved = klass->FindDirectMethod(name, signature); 4192 break; 4193 } 4194 4195 // If we found something, check that it can be accessed by the referrer. 4196 if (resolved != NULL && referrer != NULL) { 4197 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4198 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4199 if (!referring_class->CanAccess(methods_class)) { 4200 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4201 resolved, type); 4202 return NULL; 4203 } else if (!referring_class->CanAccessMember(methods_class, 4204 resolved->GetAccessFlags())) { 4205 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4206 return NULL; 4207 } 4208 } 4209 4210 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4211 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4212 switch (type) { 4213 case kDirect: 4214 case kStatic: 4215 if (resolved != NULL) { 4216 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4217 } else { 4218 resolved = klass->FindInterfaceMethod(name, signature); 4219 if (resolved != NULL) { 4220 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4221 } else { 4222 ThrowNoSuchMethodError(type, klass, name, signature); 4223 } 4224 } 4225 break; 4226 case kInterface: 4227 if (resolved != NULL) { 4228 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4229 } else { 4230 resolved = klass->FindVirtualMethod(name, signature); 4231 if (resolved != NULL) { 4232 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4233 } else { 4234 ThrowNoSuchMethodError(type, klass, name, signature); 4235 } 4236 } 4237 break; 4238 case kSuper: 4239 ThrowNoSuchMethodError(type, klass, name, signature); 4240 break; 4241 case kVirtual: 4242 if (resolved != NULL) { 4243 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4244 } else { 4245 resolved = klass->FindInterfaceMethod(name, signature); 4246 if (resolved != NULL) { 4247 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4248 } else { 4249 ThrowNoSuchMethodError(type, klass, name, signature); 4250 } 4251 } 4252 break; 4253 } 4254 DCHECK(Thread::Current()->IsExceptionPending()); 4255 return NULL; 4256 } 4257} 4258 4259mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4260 const SirtRef<mirror::DexCache>& dex_cache, 4261 const SirtRef<mirror::ClassLoader>& class_loader, 4262 bool is_static) { 4263 DCHECK(dex_cache.get() != nullptr); 4264 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4265 if (resolved != NULL) { 4266 return resolved; 4267 } 4268 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4269 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4270 if (klass == NULL) { 4271 DCHECK(Thread::Current()->IsExceptionPending()); 4272 return NULL; 4273 } 4274 4275 if (is_static) { 4276 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4277 } else { 4278 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4279 } 4280 4281 if (resolved == NULL) { 4282 const char* name = dex_file.GetFieldName(field_id); 4283 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4284 if (is_static) { 4285 resolved = klass->FindStaticField(name, type); 4286 } else { 4287 resolved = klass->FindInstanceField(name, type); 4288 } 4289 if (resolved == NULL) { 4290 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4291 return NULL; 4292 } 4293 } 4294 dex_cache->SetResolvedField(field_idx, resolved); 4295 return resolved; 4296} 4297 4298mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4299 uint32_t field_idx, 4300 const SirtRef<mirror::DexCache>& dex_cache, 4301 const SirtRef<mirror::ClassLoader>& class_loader) { 4302 DCHECK(dex_cache.get() != nullptr); 4303 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4304 if (resolved != NULL) { 4305 return resolved; 4306 } 4307 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4308 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4309 if (klass == NULL) { 4310 DCHECK(Thread::Current()->IsExceptionPending()); 4311 return NULL; 4312 } 4313 4314 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4315 StringPiece type(dex_file.StringDataByIdx( 4316 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4317 resolved = klass->FindField(name, type); 4318 if (resolved != NULL) { 4319 dex_cache->SetResolvedField(field_idx, resolved); 4320 } else { 4321 ThrowNoSuchFieldError("", klass, type, name); 4322 } 4323 return resolved; 4324} 4325 4326const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4327 uint32_t* length) { 4328 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4329 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4330 const DexFile& dex_file = *dex_cache->GetDexFile(); 4331 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4332 return dex_file.GetMethodShorty(method_id, length); 4333} 4334 4335void ClassLinker::DumpAllClasses(int flags) { 4336 if (dex_cache_image_class_lookup_required_) { 4337 MoveImageClassesToClassTable(); 4338 } 4339 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4340 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4341 std::vector<mirror::Class*> all_classes; 4342 { 4343 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4344 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4345 all_classes.push_back(it.second); 4346 } 4347 } 4348 4349 for (size_t i = 0; i < all_classes.size(); ++i) { 4350 all_classes[i]->DumpClass(std::cerr, flags); 4351 } 4352} 4353 4354void ClassLinker::DumpForSigQuit(std::ostream& os) { 4355 if (dex_cache_image_class_lookup_required_) { 4356 MoveImageClassesToClassTable(); 4357 } 4358 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4359 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4360} 4361 4362size_t ClassLinker::NumLoadedClasses() { 4363 if (dex_cache_image_class_lookup_required_) { 4364 MoveImageClassesToClassTable(); 4365 } 4366 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4367 return class_table_.size(); 4368} 4369 4370pid_t ClassLinker::GetClassesLockOwner() { 4371 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4372} 4373 4374pid_t ClassLinker::GetDexLockOwner() { 4375 return dex_lock_.GetExclusiveOwnerTid(); 4376} 4377 4378void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4379 DCHECK(!init_done_); 4380 4381 DCHECK(klass != NULL); 4382 DCHECK(klass->GetClassLoader() == NULL); 4383 4384 DCHECK(class_roots_ != NULL); 4385 DCHECK(class_roots_->Get(class_root) == NULL); 4386 class_roots_->Set<false>(class_root, klass); 4387} 4388 4389} // namespace art 4390