class_linker.cc revision 7ec2f1ca3cbd021848da75d5566f7239ce29676f
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 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr) { 189 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), VoidFunctor()))); 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 (kUseBakerOrBrooksReadBarrier) { 210 java_lang_Class->AssertReadBarrierPointer(); 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 // ensure all class_roots_ are initialized 508 for (size_t i = 0; i < kClassRootsMax; i++) { 509 ClassRoot class_root = static_cast<ClassRoot>(i); 510 mirror::Class* klass = GetClassRoot(class_root); 511 CHECK(klass != NULL); 512 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 513 // note SetClassRoot does additional validation. 514 // if possible add new checks there to catch errors early 515 } 516 517 CHECK(array_iftable_ != NULL); 518 519 // disable the slow paths in FindClass and CreatePrimitiveClass now 520 // that Object, Class, and Object[] are setup 521 init_done_ = true; 522 523 VLOG(startup) << "ClassLinker::FinishInit exiting"; 524} 525 526void ClassLinker::RunRootClinits() { 527 Thread* self = Thread::Current(); 528 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 529 mirror::Class* c = GetClassRoot(ClassRoot(i)); 530 if (!c->IsArrayClass() && !c->IsPrimitive()) { 531 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 532 EnsureInitialized(sirt_class, true, true); 533 self->AssertNoPendingException(); 534 } 535 } 536} 537 538bool ClassLinker::GenerateOatFile(const char* dex_filename, 539 int oat_fd, 540 const char* oat_cache_filename, 541 std::string* error_msg) { 542 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 543 std::string dex2oat(GetAndroidRoot()); 544 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 545 546 gc::Heap* heap = Runtime::Current()->GetHeap(); 547 std::string boot_image_option("--boot-image="); 548 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 549 550 std::string dex_file_option("--dex-file="); 551 dex_file_option += dex_filename; 552 553 std::string oat_fd_option("--oat-fd="); 554 StringAppendF(&oat_fd_option, "%d", oat_fd); 555 556 std::string oat_location_option("--oat-location="); 557 oat_location_option += oat_cache_filename; 558 559 std::vector<std::string> argv; 560 argv.push_back(dex2oat); 561 argv.push_back("--runtime-arg"); 562 argv.push_back("-Xms64m"); 563 argv.push_back("--runtime-arg"); 564 argv.push_back("-Xmx64m"); 565 argv.push_back("--runtime-arg"); 566 argv.push_back("-classpath"); 567 argv.push_back("--runtime-arg"); 568 argv.push_back(Runtime::Current()->GetClassPathString()); 569 570 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 571 572 if (!Runtime::Current()->IsVerificationEnabled()) { 573 argv.push_back("--compiler-filter=verify-none"); 574 } 575 576 if (!kIsTargetBuild) { 577 argv.push_back("--host"); 578 } 579 580 argv.push_back(boot_image_option); 581 argv.push_back(dex_file_option); 582 argv.push_back(oat_fd_option); 583 argv.push_back(oat_location_option); 584 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 585 for (size_t i = 0; i < compiler_options.size(); ++i) { 586 argv.push_back(compiler_options[i].c_str()); 587 } 588 589 return Exec(argv, error_msg); 590} 591 592const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 593 WriterMutexLock mu(Thread::Current(), dex_lock_); 594 if (kIsDebugBuild) { 595 for (size_t i = 0; i < oat_files_.size(); ++i) { 596 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 597 } 598 } 599 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 600 oat_files_.push_back(oat_file); 601 return oat_file; 602} 603 604OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 605 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 606 OatFile* oat_file = space->ReleaseOatFile(); 607 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 608 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 609 return *oat_file; 610} 611 612const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 613 const char* dex_location = dex_file.GetLocation().c_str(); 614 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 615 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 616} 617 618const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 619 const uint32_t* const dex_location_checksum) { 620 ReaderMutexLock mu(Thread::Current(), dex_lock_); 621 for (size_t i = 0; i < oat_files_.size(); i++) { 622 const OatFile* oat_file = oat_files_[i]; 623 DCHECK(oat_file != NULL); 624 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 625 dex_location_checksum, 626 false); 627 if (oat_dex_file != NULL) { 628 return oat_file; 629 } 630 } 631 return NULL; 632} 633 634const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 635 uint32_t dex_location_checksum, 636 const char* oat_location, 637 std::string* error_msg) { 638 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 639 !Runtime::Current()->IsCompiler(), 640 error_msg)); 641 if (oat_file.get() == nullptr) { 642 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 643 error_msg->c_str()); 644 return nullptr; 645 } 646 Runtime* runtime = Runtime::Current(); 647 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 648 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 649 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 650 if (expected_image_oat_checksum != actual_image_oat_checksum) { 651 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 652 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 653 actual_image_oat_checksum); 654 return nullptr; 655 } 656 657 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 658 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 659 if (expected_image_oat_offset != actual_image_oat_offset) { 660 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 661 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 662 actual_image_oat_offset); 663 return nullptr; 664 } 665 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 666 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 667 // the oat file. 668 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 669 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 670 &dex_location_checksum); 671 if (oat_dex_file == nullptr) { 672 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 673 dex_location); 674 return nullptr; 675 } 676 uint32_t expected_dex_checksum = dex_location_checksum; 677 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 678 if (expected_dex_checksum != actual_dex_checksum) { 679 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 680 "found 0x%x", oat_location, expected_dex_checksum, 681 actual_dex_checksum); 682 return nullptr; 683 } 684 return oat_dex_file->OpenDexFile(error_msg); 685} 686 687class ScopedFlock { 688 public: 689 ScopedFlock() {} 690 691 bool Init(const char* filename, std::string* error_msg) { 692 while (true) { 693 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 694 if (file_.get() == NULL) { 695 *error_msg = StringPrintf("Failed to open file '%s'", filename); 696 return false; 697 } 698 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 699 if (flock_result != 0) { 700 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 701 return false; 702 } 703 struct stat fstat_stat; 704 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 705 if (fstat_result != 0) { 706 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 707 return false; 708 } 709 struct stat stat_stat; 710 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 711 if (stat_result != 0) { 712 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 713 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 714 continue; 715 } 716 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 717 LOG(WARNING) << "File changed while locking, will retry: " << filename; 718 continue; 719 } 720 return true; 721 } 722 } 723 724 File& GetFile() { 725 return *file_; 726 } 727 728 ~ScopedFlock() { 729 if (file_.get() != NULL) { 730 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 731 CHECK_EQ(0, flock_result); 732 } 733 } 734 735 private: 736 UniquePtr<File> file_; 737 738 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 739}; 740 741const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 742 uint32_t dex_location_checksum, 743 const char* oat_location, 744 std::string* error_msg) { 745 // We play a locking game here so that if two different processes 746 // race to generate (or worse, one tries to open a partial generated 747 // file) we will be okay. This is actually common with apps that use 748 // DexClassLoader to work around the dex method reference limit and 749 // that have a background service running in a separate process. 750 ScopedFlock scoped_flock; 751 if (!scoped_flock.Init(oat_location, error_msg)) { 752 return nullptr; 753 } 754 755 // Check if we already have an up-to-date output file 756 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 757 oat_location, error_msg); 758 if (dex_file != nullptr) { 759 return dex_file; 760 } 761 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 762 << oat_location << "': " << *error_msg; 763 error_msg->clear(); 764 765 // Generate the output oat file for the dex file 766 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 767 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 768 CHECK(!error_msg->empty()); 769 return nullptr; 770 } 771 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 772 !Runtime::Current()->IsCompiler(), 773 error_msg); 774 if (oat_file == nullptr) { 775 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 776 oat_location, error_msg->c_str()); 777 return nullptr; 778 } 779 oat_file = RegisterOatFile(oat_file); 780 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 781 &dex_location_checksum); 782 if (oat_dex_file == nullptr) { 783 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 784 "'%s'", dex_location, dex_location_checksum, oat_location); 785 return nullptr; 786 } 787 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 788 CHECK(result != nullptr) << *error_msg; 789 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 790 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 791 << " dex_location_checksum=" << dex_location_checksum 792 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 793 return result; 794} 795 796bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 797 const char* dex_location, 798 uint32_t dex_location_checksum, 799 std::string* error_msg) { 800 Runtime* runtime = Runtime::Current(); 801 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 802 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 803 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 804 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 805 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 806 807 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 808 if (oat_dex_file == NULL) { 809 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 810 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 811 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 812 for (size_t i = 0; i < oat_dex_files.size(); i++) { 813 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 814 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 815 oat_file->GetLocation().c_str(), 816 oat_dex_file->GetDexFileLocation().c_str()); 817 } 818 return false; 819 } 820 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 821 822 if (image_check && dex_check) { 823 return true; 824 } 825 826 if (!image_check) { 827 ScopedObjectAccess soa(Thread::Current()); 828 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 829 oat_file->GetLocation().c_str(), 830 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 831 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 832 image_oat_checksum, image_oat_data_begin); 833 } 834 if (!dex_check) { 835 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 836 oat_file->GetLocation().c_str(), 837 oat_dex_file->GetDexFileLocationChecksum(), 838 dex_location, dex_location_checksum); 839 } 840 return false; 841} 842 843const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 844 const char* dex_location, 845 std::string* error_msg, 846 bool* open_failed) { 847 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 848 if (oat_file.get() == nullptr) { 849 *open_failed = true; 850 return nullptr; 851 } 852 *open_failed = false; 853 uint32_t dex_location_checksum; 854 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 855 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 856 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 857 // directory. 858 const OatFile* opened_oat_file = oat_file.release(); 859 opened_oat_file = RegisterOatFile(opened_oat_file); 860 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 861 if (oat_dex_file == nullptr) { 862 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 863 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 864 error_msg->c_str()); 865 return nullptr; 866 } 867 return oat_dex_file->OpenDexFile(error_msg); 868 } 869 870 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 871 error_msg); 872 if (!verified) { 873 return nullptr; 874 } 875 const OatFile* opened_oat_file = oat_file.release(); 876 opened_oat_file = RegisterOatFile(opened_oat_file); 877 return opened_oat_file->GetOatDexFile(dex_location, 878 &dex_location_checksum)->OpenDexFile(error_msg); 879} 880 881const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 882 const uint32_t* const dex_location_checksum, 883 std::string* error_msg) { 884 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 885 dex_location_checksum); 886 if (open_oat_file != nullptr) { 887 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 888 dex_location_checksum); 889 return oat_dex_file->OpenDexFile(error_msg); 890 } 891 892 // Look for an existing file next to dex. for example, for 893 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 894 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 895 bool open_failed; 896 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 897 error_msg, &open_failed); 898 if (dex_file != nullptr) { 899 return dex_file; 900 } 901 if (dex_location_checksum == nullptr) { 902 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 903 odex_filename.c_str(), dex_location, error_msg->c_str()); 904 return nullptr; 905 } 906 907 std::string cache_error_msg; 908 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 909 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 910 &open_failed); 911 if (dex_file != nullptr) { 912 return dex_file; 913 } 914 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 915 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 916 } 917 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 918 << " (error '" << *error_msg << "') or " << cache_location 919 << " (error '" << cache_error_msg << "')."; 920 921 // Try to generate oat file if it wasn't found or was obsolete. 922 error_msg->clear(); 923 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 924 cache_location.c_str(), error_msg); 925} 926 927const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 928 ReaderMutexLock mu(Thread::Current(), dex_lock_); 929 for (size_t i = 0; i < oat_files_.size(); i++) { 930 const OatFile* oat_file = oat_files_[i]; 931 DCHECK(oat_file != nullptr); 932 if (oat_file->GetLocation() == oat_location) { 933 return oat_file; 934 } 935 } 936 return nullptr; 937} 938 939const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 940 std::string* error_msg) { 941 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 942 if (oat_file != nullptr) { 943 return oat_file; 944 } 945 946 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 947 error_msg); 948 if (oat_file == NULL) { 949 return NULL; 950 } 951 return oat_file; 952} 953 954static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 955 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 956 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 957 958 DCHECK(obj != NULL); 959 DCHECK(class_linker != NULL); 960 961 if (obj->IsArtMethod()) { 962 mirror::ArtMethod* method = obj->AsArtMethod(); 963 if (!method->IsNative()) { 964 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 965 if (method != Runtime::Current()->GetResolutionMethod()) { 966 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 967 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 968 } 969 } 970 } 971} 972 973void ClassLinker::InitFromImage() { 974 VLOG(startup) << "ClassLinker::InitFromImage entering"; 975 CHECK(!init_done_); 976 977 Thread* self = Thread::Current(); 978 gc::Heap* heap = Runtime::Current()->GetHeap(); 979 gc::space::ImageSpace* space = heap->GetImageSpace(); 980 dex_cache_image_class_lookup_required_ = true; 981 CHECK(space != NULL); 982 OatFile& oat_file = GetImageOatFile(space); 983 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 984 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 985 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 986 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 987 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 988 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 989 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 990 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 991 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 992 mirror::ObjectArray<mirror::DexCache>* dex_caches = 993 dex_caches_object->AsObjectArray<mirror::DexCache>(); 994 995 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 996 self, 997 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 998 class_roots_ = class_roots.get(); 999 1000 // Special case of setting up the String class early so that we can test arbitrary objects 1001 // as being Strings or not 1002 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1003 1004 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1005 static_cast<uint32_t>(dex_caches->GetLength())); 1006 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1007 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1008 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1009 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1010 nullptr); 1011 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1012 std::string error_msg; 1013 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1014 if (dex_file == NULL) { 1015 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1016 << " from within oat file " << oat_file.GetLocation() 1017 << " error '" << error_msg << "'"; 1018 } 1019 1020 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1021 1022 AppendToBootClassPath(*dex_file, dex_cache); 1023 } 1024 1025 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1026 // bitmap walk. 1027 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1028 1029 // Set entry point to interpreter if in InterpretOnly mode. 1030 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1031 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1032 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1033 } 1034 1035 // reinit class_roots_ 1036 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1037 class_roots_ = class_roots.get(); 1038 1039 // reinit array_iftable_ from any array class instance, they should be == 1040 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1041 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1042 // String class root was set above 1043 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1044 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1045 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1046 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1047 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1048 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1049 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1050 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1051 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1052 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1053 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1054 1055 FinishInit(self); 1056 1057 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1058} 1059 1060// Keep in sync with InitCallback. Anything we visit, we need to 1061// reinit references to when reinitializing a ClassLinker from a 1062// mapped image. 1063void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1064 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1065 Thread* self = Thread::Current(); 1066 { 1067 ReaderMutexLock mu(self, dex_lock_); 1068 if ((flags & kVisitRootFlagAllRoots) != 0) { 1069 for (mirror::DexCache*& dex_cache : dex_caches_) { 1070 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1071 } 1072 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1073 for (size_t index : new_dex_cache_roots_) { 1074 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1075 } 1076 } 1077 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1078 new_dex_cache_roots_.clear(); 1079 } 1080 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1081 log_new_dex_caches_roots_ = true; 1082 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1083 log_new_dex_caches_roots_ = false; 1084 } 1085 } 1086 { 1087 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1088 if ((flags & kVisitRootFlagAllRoots) != 0) { 1089 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1090 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1091 } 1092 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1093 for (auto& pair : new_class_roots_) { 1094 mirror::Object* old_ref = pair.second; 1095 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1096 if (UNLIKELY(pair.second != old_ref)) { 1097 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1098 // corresponding object. This is slow, but luckily for us, this may only happen with a 1099 // concurrent moving GC. 1100 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1101 it != end && it->first == pair.first; ++it) { 1102 // If the class stored matches the old class, update it to the new value. 1103 if (old_ref == it->second) { 1104 it->second = pair.second; 1105 } 1106 } 1107 } 1108 } 1109 } 1110 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1111 new_class_roots_.clear(); 1112 } 1113 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1114 log_new_class_table_roots_ = true; 1115 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1116 log_new_class_table_roots_ = false; 1117 } 1118 // We deliberately ignore the class roots in the image since we 1119 // handle image roots by using the MS/CMS rescanning of dirty cards. 1120 } 1121 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1122 DCHECK(array_iftable_ != nullptr); 1123 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1124 if (find_array_class_cache_[i] != nullptr) { 1125 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1126 kRootVMInternal); 1127 } 1128 } 1129} 1130 1131void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1132 if (dex_cache_image_class_lookup_required_) { 1133 MoveImageClassesToClassTable(); 1134 } 1135 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1136 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1137 if (!visitor(it.second, arg)) { 1138 return; 1139 } 1140 } 1141} 1142 1143static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1144 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1145 classes->insert(c); 1146 return true; 1147} 1148 1149void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1150 std::set<mirror::Class*> classes; 1151 VisitClasses(GetClassesVisitor, &classes); 1152 for (mirror::Class* klass : classes) { 1153 if (!visitor(klass, arg)) { 1154 return; 1155 } 1156 } 1157} 1158 1159ClassLinker::~ClassLinker() { 1160 mirror::Class::ResetClass(); 1161 mirror::String::ResetClass(); 1162 mirror::ArtField::ResetClass(); 1163 mirror::ArtMethod::ResetClass(); 1164 mirror::BooleanArray::ResetArrayClass(); 1165 mirror::ByteArray::ResetArrayClass(); 1166 mirror::CharArray::ResetArrayClass(); 1167 mirror::DoubleArray::ResetArrayClass(); 1168 mirror::FloatArray::ResetArrayClass(); 1169 mirror::IntArray::ResetArrayClass(); 1170 mirror::LongArray::ResetArrayClass(); 1171 mirror::ShortArray::ResetArrayClass(); 1172 mirror::Throwable::ResetClass(); 1173 mirror::StackTraceElement::ResetClass(); 1174 STLDeleteElements(&boot_class_path_); 1175 STLDeleteElements(&oat_files_); 1176} 1177 1178mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1179 gc::Heap* heap = Runtime::Current()->GetHeap(); 1180 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1181 SirtRef<mirror::DexCache> dex_cache( 1182 self, down_cast<mirror::DexCache*>( 1183 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize(), 1184 VoidFunctor()))); 1185 if (dex_cache.get() == NULL) { 1186 return NULL; 1187 } 1188 SirtRef<mirror::String> 1189 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1190 if (location.get() == NULL) { 1191 return NULL; 1192 } 1193 SirtRef<mirror::ObjectArray<mirror::String> > 1194 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1195 if (strings.get() == NULL) { 1196 return NULL; 1197 } 1198 SirtRef<mirror::ObjectArray<mirror::Class> > 1199 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1200 if (types.get() == NULL) { 1201 return NULL; 1202 } 1203 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1204 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1205 if (methods.get() == NULL) { 1206 return NULL; 1207 } 1208 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1209 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1210 if (fields.get() == NULL) { 1211 return NULL; 1212 } 1213 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1214 fields.get()); 1215 return dex_cache.get(); 1216} 1217 1218// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1219// fence. 1220class InitializeClassVisitor { 1221 public: 1222 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1223 } 1224 1225 void operator()(mirror::Object* obj, size_t usable_size) const 1226 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1227 DCHECK_LE(class_size_, usable_size); 1228 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1229 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1230 // DCHECK(klass->IsClass()); 1231 klass->SetClassSize(class_size_); 1232 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1233 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1234 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1235 } 1236 1237 private: 1238 const uint32_t class_size_; 1239 1240 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1241}; 1242 1243mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1244 uint32_t class_size) { 1245 DCHECK_GE(class_size, sizeof(mirror::Class)); 1246 gc::Heap* heap = Runtime::Current()->GetHeap(); 1247 InitializeClassVisitor visitor(class_size); 1248 mirror::Object* k = 1249 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1250 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1251 if (UNLIKELY(k == nullptr)) { 1252 CHECK(self->IsExceptionPending()); // OOME. 1253 return nullptr; 1254 } 1255 return k->AsClass(); 1256} 1257 1258mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1259 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1260} 1261 1262mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1263 return down_cast<mirror::ArtField*>( 1264 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1265} 1266 1267mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1268 return down_cast<mirror::ArtMethod*>( 1269 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1270} 1271 1272mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1273 Thread* self, size_t length) { 1274 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1275 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1276} 1277 1278static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1279 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1280 DCHECK(klass != NULL); 1281 // Wait for the class if it has not already been linked. 1282 if (!klass->IsResolved() && !klass->IsErroneous()) { 1283 SirtRef<mirror::Class> sirt_class(self, klass); 1284 ObjectLock<mirror::Class> lock(self, &sirt_class); 1285 // Check for circular dependencies between classes. 1286 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1287 ThrowClassCircularityError(sirt_class.get()); 1288 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1289 return nullptr; 1290 } 1291 // Wait for the pending initialization to complete. 1292 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1293 lock.WaitIgnoringInterrupts(); 1294 } 1295 klass = sirt_class.get(); 1296 } 1297 if (klass->IsErroneous()) { 1298 ThrowEarlierClassFailure(klass); 1299 return nullptr; 1300 } 1301 // Return the loaded class. No exceptions should be pending. 1302 CHECK(klass->IsResolved()) << PrettyClass(klass); 1303 self->AssertNoPendingException(); 1304 return klass; 1305} 1306 1307mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1308 const SirtRef<mirror::ClassLoader>& class_loader) { 1309 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1310 DCHECK(self != nullptr); 1311 self->AssertNoPendingException(); 1312 if (descriptor[1] == '\0') { 1313 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1314 // for primitive classes that aren't backed by dex files. 1315 return FindPrimitiveClass(descriptor[0]); 1316 } 1317 // Find the class in the loaded classes table. 1318 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1319 if (klass != NULL) { 1320 return EnsureResolved(self, klass); 1321 } 1322 // Class is not yet loaded. 1323 if (descriptor[0] == '[') { 1324 return CreateArrayClass(self, descriptor, class_loader); 1325 } else if (class_loader.get() == nullptr) { 1326 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1327 if (pair.second != NULL) { 1328 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1329 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1330 } 1331 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1332 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1333 // throw of a NoClassDefFoundError. 1334 if (IsInBootClassPath(descriptor)) { 1335 mirror::Class* system_class = FindSystemClass(self, descriptor); 1336 CHECK(system_class != NULL); 1337 return system_class; 1338 } 1339 // Next try the compile time class path. 1340 const std::vector<const DexFile*>* class_path; 1341 { 1342 ScopedObjectAccessUnchecked soa(self); 1343 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1344 soa.AddLocalReference<jobject>(class_loader.get())); 1345 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1346 } 1347 1348 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1349 if (pair.second != NULL) { 1350 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1351 } 1352 1353 } else { 1354 ScopedObjectAccessUnchecked soa(self); 1355 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1356 soa.AddLocalReference<jobject>(class_loader.get())); 1357 std::string class_name_string(DescriptorToDot(descriptor)); 1358 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1359 { 1360 ScopedThreadStateChange tsc(self, kNative); 1361 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1362 soa.Env()->NewStringUTF(class_name_string.c_str())); 1363 if (class_name_object.get() == NULL) { 1364 return NULL; 1365 } 1366 CHECK(class_loader_object.get() != NULL); 1367 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1368 WellKnownClasses::java_lang_ClassLoader_loadClass, 1369 class_name_object.get())); 1370 } 1371 if (self->IsExceptionPending()) { 1372 // If the ClassLoader threw, pass that exception up. 1373 return NULL; 1374 } else if (result.get() == NULL) { 1375 // broken loader - throw NPE to be compatible with Dalvik 1376 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1377 class_name_string.c_str()).c_str()); 1378 return NULL; 1379 } else { 1380 // success, return mirror::Class* 1381 return soa.Decode<mirror::Class*>(result.get()); 1382 } 1383 } 1384 1385 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1386 return NULL; 1387} 1388 1389mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1390 const SirtRef<mirror::ClassLoader>& class_loader, 1391 const DexFile& dex_file, 1392 const DexFile::ClassDef& dex_class_def) { 1393 Thread* self = Thread::Current(); 1394 SirtRef<mirror::Class> klass(self, NULL); 1395 // Load the class from the dex file. 1396 if (UNLIKELY(!init_done_)) { 1397 // finish up init of hand crafted class_roots_ 1398 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1399 klass.reset(GetClassRoot(kJavaLangObject)); 1400 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1401 klass.reset(GetClassRoot(kJavaLangClass)); 1402 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1403 klass.reset(GetClassRoot(kJavaLangString)); 1404 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1405 klass.reset(GetClassRoot(kJavaLangDexCache)); 1406 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1407 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1408 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1409 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1410 } else { 1411 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1412 } 1413 } else { 1414 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1415 } 1416 if (UNLIKELY(klass.get() == NULL)) { 1417 CHECK(self->IsExceptionPending()); // Expect an OOME. 1418 return NULL; 1419 } 1420 klass->SetDexCache(FindDexCache(dex_file)); 1421 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1422 // Check for a pending exception during load 1423 if (self->IsExceptionPending()) { 1424 klass->SetStatus(mirror::Class::kStatusError, self); 1425 return NULL; 1426 } 1427 ObjectLock<mirror::Class> lock(self, &klass); 1428 klass->SetClinitThreadId(self->GetTid()); 1429 // Add the newly loaded class to the loaded classes table. 1430 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1431 if (existing != NULL) { 1432 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1433 // this thread to block. 1434 return EnsureResolved(self, existing); 1435 } 1436 // Finish loading (if necessary) by finding parents 1437 CHECK(!klass->IsLoaded()); 1438 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1439 // Loading failed. 1440 klass->SetStatus(mirror::Class::kStatusError, self); 1441 return NULL; 1442 } 1443 CHECK(klass->IsLoaded()); 1444 // Link the class (if necessary) 1445 CHECK(!klass->IsResolved()); 1446 // TODO: Use fast jobjects? 1447 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1448 if (!LinkClass(self, klass, interfaces)) { 1449 // Linking failed. 1450 klass->SetStatus(mirror::Class::kStatusError, self); 1451 return NULL; 1452 } 1453 CHECK(klass->IsResolved()); 1454 1455 /* 1456 * We send CLASS_PREPARE events to the debugger from here. The 1457 * definition of "preparation" is creating the static fields for a 1458 * class and initializing them to the standard default values, but not 1459 * executing any code (that comes later, during "initialization"). 1460 * 1461 * We did the static preparation in LinkClass. 1462 * 1463 * The class has been prepared and resolved but possibly not yet verified 1464 * at this point. 1465 */ 1466 Dbg::PostClassPrepare(klass.get()); 1467 1468 return klass.get(); 1469} 1470 1471// Precomputes size that will be needed for Class, matching LinkStaticFields 1472uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1473 const DexFile::ClassDef& dex_class_def) { 1474 const byte* class_data = dex_file.GetClassData(dex_class_def); 1475 size_t num_ref = 0; 1476 size_t num_32 = 0; 1477 size_t num_64 = 0; 1478 if (class_data != NULL) { 1479 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1480 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1481 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1482 char c = descriptor[0]; 1483 if (c == 'L' || c == '[') { 1484 num_ref++; 1485 } else if (c == 'J' || c == 'D') { 1486 num_64++; 1487 } else { 1488 num_32++; 1489 } 1490 } 1491 } 1492 // start with generic class data 1493 uint32_t size = sizeof(mirror::Class); 1494 // follow with reference fields which must be contiguous at start 1495 size += (num_ref * sizeof(uint32_t)); 1496 // if there are 64-bit fields to add, make sure they are aligned 1497 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1498 if (num_32 != 0) { 1499 // use an available 32-bit field for padding 1500 num_32--; 1501 } 1502 size += sizeof(uint32_t); // either way, we are adding a word 1503 DCHECK_EQ(size, RoundUp(size, 8)); 1504 } 1505 // tack on any 64-bit fields now that alignment is assured 1506 size += (num_64 * sizeof(uint64_t)); 1507 // tack on any remaining 32-bit fields 1508 size += (num_32 * sizeof(uint32_t)); 1509 return size; 1510} 1511 1512const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1513 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1514 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1515 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1516 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1517 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1518 &dex_location_checksum); 1519 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1520 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1521 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1522 return oat_class; 1523} 1524 1525static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1526 uint32_t method_idx) { 1527 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1528 const byte* class_data = dex_file.GetClassData(class_def); 1529 CHECK(class_data != NULL); 1530 ClassDataItemIterator it(dex_file, class_data); 1531 // Skip fields 1532 while (it.HasNextStaticField()) { 1533 it.Next(); 1534 } 1535 while (it.HasNextInstanceField()) { 1536 it.Next(); 1537 } 1538 // Process methods 1539 size_t class_def_method_index = 0; 1540 while (it.HasNextDirectMethod()) { 1541 if (it.GetMemberIndex() == method_idx) { 1542 return class_def_method_index; 1543 } 1544 class_def_method_index++; 1545 it.Next(); 1546 } 1547 while (it.HasNextVirtualMethod()) { 1548 if (it.GetMemberIndex() == method_idx) { 1549 return class_def_method_index; 1550 } 1551 class_def_method_index++; 1552 it.Next(); 1553 } 1554 DCHECK(!it.HasNext()); 1555 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1556 return 0; 1557} 1558 1559const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1560 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1561 // method for direct methods (or virtual methods made direct). 1562 mirror::Class* declaring_class = method->GetDeclaringClass(); 1563 size_t oat_method_index; 1564 if (method->IsStatic() || method->IsDirect()) { 1565 // Simple case where the oat method index was stashed at load time. 1566 oat_method_index = method->GetMethodIndex(); 1567 } else { 1568 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1569 // by search for its position in the declared virtual methods. 1570 oat_method_index = declaring_class->NumDirectMethods(); 1571 size_t end = declaring_class->NumVirtualMethods(); 1572 bool found = false; 1573 for (size_t i = 0; i < end; i++) { 1574 if (declaring_class->GetVirtualMethod(i) == method) { 1575 found = true; 1576 break; 1577 } 1578 oat_method_index++; 1579 } 1580 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1581 } 1582 UniquePtr<const OatFile::OatClass> 1583 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1584 declaring_class->GetDexClassDefIndex())); 1585 CHECK(oat_class.get() != NULL); 1586 DCHECK_EQ(oat_method_index, 1587 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1588 method->GetDeclaringClass()->GetDexClassDefIndex(), 1589 method->GetDexMethodIndex())); 1590 1591 return oat_class->GetOatMethod(oat_method_index); 1592} 1593 1594// Special case to get oat code without overwriting a trampoline. 1595const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1596 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1597 if (method->IsProxyMethod()) { 1598 return GetQuickProxyInvokeHandler(); 1599 } 1600 const void* result = GetOatMethodFor(method).GetQuickCode(); 1601 if (result == nullptr) { 1602 if (method->IsNative()) { 1603 // No code and native? Use generic trampoline. 1604 result = GetQuickGenericJniTrampoline(); 1605 } else if (method->IsPortableCompiled()) { 1606 // No code? Do we expect portable code? 1607 result = GetQuickToPortableBridge(); 1608 } else { 1609 // No code? You must mean to go into the interpreter. 1610 result = GetQuickToInterpreterBridge(); 1611 } 1612 } 1613 return result; 1614} 1615 1616const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1617 bool* have_portable_code) { 1618 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1619 *have_portable_code = false; 1620 if (method->IsProxyMethod()) { 1621 return GetPortableProxyInvokeHandler(); 1622 } 1623 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1624 const void* result = oat_method.GetPortableCode(); 1625 if (result == nullptr) { 1626 if (oat_method.GetQuickCode() == nullptr) { 1627 // No code? You must mean to go into the interpreter. 1628 result = GetPortableToInterpreterBridge(); 1629 } else { 1630 // No code? But there's quick code, so use a bridge. 1631 result = GetPortableToQuickBridge(); 1632 } 1633 } else { 1634 *have_portable_code = true; 1635 } 1636 return result; 1637} 1638 1639const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1640 uint32_t method_idx) { 1641 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1642 CHECK(oat_class.get() != nullptr); 1643 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1644 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1645} 1646 1647const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1648 uint32_t method_idx) { 1649 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1650 CHECK(oat_class.get() != nullptr); 1651 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1652 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1653} 1654 1655// Returns true if the method must run with interpreter, false otherwise. 1656static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1657 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1658 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1659 // No code: need interpreter. 1660 // May return true for native code, in the case of generic JNI 1661 // DCHECK(!method->IsNative()); 1662 return true; 1663 } 1664#ifdef ART_SEA_IR_MODE 1665 ScopedObjectAccess soa(Thread::Current()); 1666 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1667 LOG(INFO) << "Found " << PrettyMethod(method); 1668 return false; 1669 } 1670#endif 1671 // If interpreter mode is enabled, every method (except native and proxy) must 1672 // be run with interpreter. 1673 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1674 !method->IsNative() && !method->IsProxyMethod(); 1675} 1676 1677void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1678 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1679 if (klass->NumDirectMethods() == 0) { 1680 return; // No direct methods => no static methods. 1681 } 1682 Runtime* runtime = Runtime::Current(); 1683 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1684 return; // OAT file unavailable. 1685 } 1686 ClassHelper kh(klass); 1687 const DexFile& dex_file = kh.GetDexFile(); 1688 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1689 CHECK(dex_class_def != nullptr); 1690 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1691 // There should always be class data if there were direct methods. 1692 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1693 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1694 CHECK(oat_class.get() != nullptr); 1695 ClassDataItemIterator it(dex_file, class_data); 1696 // Skip fields 1697 while (it.HasNextStaticField()) { 1698 it.Next(); 1699 } 1700 while (it.HasNextInstanceField()) { 1701 it.Next(); 1702 } 1703 // Link the code of methods skipped by LinkCode. 1704 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1705 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1706 if (!method->IsStatic()) { 1707 // Only update static methods. 1708 continue; 1709 } 1710 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1711 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1712 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1713 bool have_portable_code = false; 1714 if (enter_interpreter) { 1715 // Use interpreter entry point. 1716 // Check whether the method is native, in which case it's generic JNI. 1717 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1718 quick_code = GetQuickGenericJniTrampoline(); 1719 portable_code = GetPortableToQuickBridge(); 1720 } else { 1721 portable_code = GetPortableToInterpreterBridge(); 1722 quick_code = GetQuickToInterpreterBridge(); 1723 } 1724 } else { 1725 if (portable_code == nullptr) { 1726 portable_code = GetPortableToQuickBridge(); 1727 } else { 1728 have_portable_code = true; 1729 } 1730 if (quick_code == nullptr) { 1731 quick_code = GetQuickToPortableBridge(); 1732 } 1733 } 1734 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1735 have_portable_code); 1736 } 1737 // Ignore virtual methods on the iterator. 1738} 1739 1740static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1741 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1742 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1743 // Method shouldn't have already been linked. 1744 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1745 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1746 // Every kind of method should at least get an invoke stub from the oat_method. 1747 // non-abstract methods also get their code pointers. 1748 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1749 oat_method.LinkMethod(method.get()); 1750 1751 // Install entry point from interpreter. 1752 Runtime* runtime = Runtime::Current(); 1753 bool enter_interpreter = NeedsInterpreter(method.get(), 1754 method->GetEntryPointFromQuickCompiledCode(), 1755 method->GetEntryPointFromPortableCompiledCode()); 1756 if (enter_interpreter && !method->IsNative()) { 1757 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1758 } else { 1759 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1760 } 1761 1762 if (method->IsAbstract()) { 1763 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1764 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1765 return; 1766 } 1767 1768 bool have_portable_code = false; 1769 if (method->IsStatic() && !method->IsConstructor()) { 1770 // For static methods excluding the class initializer, install the trampoline. 1771 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1772 // after initializing class (see ClassLinker::InitializeClass method). 1773 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1774 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1775 } else if (enter_interpreter) { 1776 if (!method->IsNative()) { 1777 // Set entry point from compiled code if there's no code or in interpreter only mode. 1778 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1779 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1780 } else { 1781 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1782 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1783 } 1784 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1785 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1786 have_portable_code = true; 1787 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1788 } else { 1789 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1790 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1791 } 1792 1793 if (method->IsNative()) { 1794 // Unregistering restores the dlsym lookup stub. 1795 method->UnregisterNative(Thread::Current()); 1796 1797 if (enter_interpreter) { 1798 // We have a native method here without code. Then it should have either the GenericJni 1799 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1800 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1801 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1802 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1803 1804 DCHECK_EQ(method->GetFrameSizeInBytes<false>(), 0U); 1805 1806 // Fix up method metadata if necessary. 1807 uint32_t s_len; 1808 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_index), &s_len); 1809 uint32_t refs = 1; // Native method always has "this" or class. 1810 for (uint32_t i = 1; i < s_len; ++i) { 1811 if (shorty[i] == 'L') { 1812 refs++; 1813 } 1814 } 1815 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(refs); 1816 1817 // Get the generic spill masks and base frame size. 1818 mirror::ArtMethod* callee_save_method = 1819 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 1820 1821 method->SetFrameSizeInBytes(callee_save_method->GetFrameSizeInBytes() + sirt_size); 1822 method->SetCoreSpillMask(callee_save_method->GetCoreSpillMask()); 1823 method->SetFpSpillMask(callee_save_method->GetFpSpillMask()); 1824 } 1825 } 1826 1827 // Allow instrumentation its chance to hijack code. 1828 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1829 method->GetEntryPointFromQuickCompiledCode(), 1830 method->GetEntryPointFromPortableCompiledCode(), 1831 have_portable_code); 1832} 1833 1834void ClassLinker::LoadClass(const DexFile& dex_file, 1835 const DexFile::ClassDef& dex_class_def, 1836 const SirtRef<mirror::Class>& klass, 1837 mirror::ClassLoader* class_loader) { 1838 CHECK(klass.get() != NULL); 1839 CHECK(klass->GetDexCache() != NULL); 1840 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1841 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1842 CHECK(descriptor != NULL); 1843 1844 klass->SetClass(GetClassRoot(kJavaLangClass)); 1845 if (kUseBakerOrBrooksReadBarrier) { 1846 klass->AssertReadBarrierPointer(); 1847 } 1848 uint32_t access_flags = dex_class_def.access_flags_; 1849 // Make sure that none of our runtime-only flags are set. 1850 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1851 klass->SetAccessFlags(access_flags); 1852 klass->SetClassLoader(class_loader); 1853 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1854 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1855 1856 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1857 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1858 1859 // Load fields fields. 1860 const byte* class_data = dex_file.GetClassData(dex_class_def); 1861 if (class_data == NULL) { 1862 return; // no fields or methods - for example a marker interface 1863 } 1864 ClassDataItemIterator it(dex_file, class_data); 1865 Thread* self = Thread::Current(); 1866 if (it.NumStaticFields() != 0) { 1867 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1868 if (UNLIKELY(statics == NULL)) { 1869 CHECK(self->IsExceptionPending()); // OOME. 1870 return; 1871 } 1872 klass->SetSFields(statics); 1873 } 1874 if (it.NumInstanceFields() != 0) { 1875 mirror::ObjectArray<mirror::ArtField>* fields = 1876 AllocArtFieldArray(self, it.NumInstanceFields()); 1877 if (UNLIKELY(fields == NULL)) { 1878 CHECK(self->IsExceptionPending()); // OOME. 1879 return; 1880 } 1881 klass->SetIFields(fields); 1882 } 1883 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1884 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1885 if (UNLIKELY(sfield.get() == NULL)) { 1886 CHECK(self->IsExceptionPending()); // OOME. 1887 return; 1888 } 1889 klass->SetStaticField(i, sfield.get()); 1890 LoadField(dex_file, it, klass, sfield); 1891 } 1892 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1893 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1894 if (UNLIKELY(ifield.get() == NULL)) { 1895 CHECK(self->IsExceptionPending()); // OOME. 1896 return; 1897 } 1898 klass->SetInstanceField(i, ifield.get()); 1899 LoadField(dex_file, it, klass, ifield); 1900 } 1901 1902 UniquePtr<const OatFile::OatClass> oat_class; 1903 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1904 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1905 } 1906 1907 // Load methods. 1908 if (it.NumDirectMethods() != 0) { 1909 // TODO: append direct methods to class object 1910 mirror::ObjectArray<mirror::ArtMethod>* directs = 1911 AllocArtMethodArray(self, it.NumDirectMethods()); 1912 if (UNLIKELY(directs == NULL)) { 1913 CHECK(self->IsExceptionPending()); // OOME. 1914 return; 1915 } 1916 klass->SetDirectMethods(directs); 1917 } 1918 if (it.NumVirtualMethods() != 0) { 1919 // TODO: append direct methods to class object 1920 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1921 AllocArtMethodArray(self, it.NumVirtualMethods()); 1922 if (UNLIKELY(virtuals == NULL)) { 1923 CHECK(self->IsExceptionPending()); // OOME. 1924 return; 1925 } 1926 klass->SetVirtualMethods(virtuals); 1927 } 1928 size_t class_def_method_index = 0; 1929 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1930 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1931 if (UNLIKELY(method.get() == NULL)) { 1932 CHECK(self->IsExceptionPending()); // OOME. 1933 return; 1934 } 1935 klass->SetDirectMethod(i, method.get()); 1936 if (oat_class.get() != NULL) { 1937 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1938 } 1939 method->SetMethodIndex(class_def_method_index); 1940 class_def_method_index++; 1941 } 1942 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1943 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1944 if (UNLIKELY(method.get() == NULL)) { 1945 CHECK(self->IsExceptionPending()); // OOME. 1946 return; 1947 } 1948 klass->SetVirtualMethod(i, method.get()); 1949 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1950 if (oat_class.get() != NULL) { 1951 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1952 } 1953 class_def_method_index++; 1954 } 1955 DCHECK(!it.HasNext()); 1956} 1957 1958void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1959 const SirtRef<mirror::Class>& klass, 1960 const SirtRef<mirror::ArtField>& dst) { 1961 uint32_t field_idx = it.GetMemberIndex(); 1962 dst->SetDexFieldIndex(field_idx); 1963 dst->SetDeclaringClass(klass.get()); 1964 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1965} 1966 1967mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1968 const ClassDataItemIterator& it, 1969 const SirtRef<mirror::Class>& klass) { 1970 uint32_t dex_method_idx = it.GetMemberIndex(); 1971 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1972 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1973 1974 mirror::ArtMethod* dst = AllocArtMethod(self); 1975 if (UNLIKELY(dst == NULL)) { 1976 CHECK(self->IsExceptionPending()); // OOME. 1977 return NULL; 1978 } 1979 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1980 1981 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1982 dst->SetDexMethodIndex(dex_method_idx); 1983 dst->SetDeclaringClass(klass.get()); 1984 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1985 1986 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1987 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1988 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1989 1990 uint32_t access_flags = it.GetMemberAccessFlags(); 1991 1992 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1993 // Set finalizable flag on declaring class. 1994 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1995 // Void return type. 1996 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1997 klass->SetFinalizable(); 1998 } else { 1999 ClassHelper kh(klass.get()); 2000 const char* klass_descriptor = kh.GetDescriptor(); 2001 // The Enum class declares a "final" finalize() method to prevent subclasses from 2002 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2003 // subclasses, so we exclude it here. 2004 // We also want to avoid setting the flag on Object, where we know that finalize() is 2005 // empty. 2006 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2007 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2008 klass->SetFinalizable(); 2009 } 2010 } 2011 } 2012 } else if (method_name[0] == '<') { 2013 // Fix broken access flags for initializers. Bug 11157540. 2014 bool is_init = (strcmp("<init>", method_name) == 0); 2015 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2016 if (UNLIKELY(!is_init && !is_clinit)) { 2017 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2018 } else { 2019 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2020 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2021 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2022 access_flags |= kAccConstructor; 2023 } 2024 } 2025 } 2026 dst->SetAccessFlags(access_flags); 2027 2028 self->EndAssertNoThreadSuspension(old_cause); 2029 return dst; 2030} 2031 2032void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2033 Thread* self = Thread::Current(); 2034 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2035 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2036 AppendToBootClassPath(dex_file, dex_cache); 2037} 2038 2039void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2040 const SirtRef<mirror::DexCache>& dex_cache) { 2041 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2042 boot_class_path_.push_back(&dex_file); 2043 RegisterDexFile(dex_file, dex_cache); 2044} 2045 2046bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2047 dex_lock_.AssertSharedHeld(Thread::Current()); 2048 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2049 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2050 return true; 2051 } 2052 } 2053 return false; 2054} 2055 2056bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2057 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2058 return IsDexFileRegisteredLocked(dex_file); 2059} 2060 2061void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2062 const SirtRef<mirror::DexCache>& dex_cache) { 2063 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2064 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2065 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2066 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2067 dex_caches_.push_back(dex_cache.get()); 2068 dex_cache->SetDexFile(&dex_file); 2069 if (log_new_dex_caches_roots_) { 2070 // TODO: This is not safe if we can remove dex caches. 2071 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2072 } 2073} 2074 2075void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2076 Thread* self = Thread::Current(); 2077 { 2078 ReaderMutexLock mu(self, dex_lock_); 2079 if (IsDexFileRegisteredLocked(dex_file)) { 2080 return; 2081 } 2082 } 2083 // Don't alloc while holding the lock, since allocation may need to 2084 // suspend all threads and another thread may need the dex_lock_ to 2085 // get to a suspend point. 2086 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2087 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2088 { 2089 WriterMutexLock mu(self, dex_lock_); 2090 if (IsDexFileRegisteredLocked(dex_file)) { 2091 return; 2092 } 2093 RegisterDexFileLocked(dex_file, dex_cache); 2094 } 2095} 2096 2097void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2098 const SirtRef<mirror::DexCache>& dex_cache) { 2099 WriterMutexLock mu(Thread::Current(), dex_lock_); 2100 RegisterDexFileLocked(dex_file, dex_cache); 2101} 2102 2103mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2104 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2105 // Search assuming unique-ness of dex file. 2106 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2107 mirror::DexCache* dex_cache = dex_caches_[i]; 2108 if (dex_cache->GetDexFile() == &dex_file) { 2109 return dex_cache; 2110 } 2111 } 2112 // Search matching by location name. 2113 std::string location(dex_file.GetLocation()); 2114 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2115 mirror::DexCache* dex_cache = dex_caches_[i]; 2116 if (dex_cache->GetDexFile()->GetLocation() == location) { 2117 return dex_cache; 2118 } 2119 } 2120 // Failure, dump diagnostic and abort. 2121 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2122 mirror::DexCache* dex_cache = dex_caches_[i]; 2123 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2124 } 2125 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2126 return NULL; 2127} 2128 2129void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2130 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2131 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2132 dex_caches_[i]->Fixup(resolution_method); 2133 } 2134} 2135 2136mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2137 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2138 if (UNLIKELY(klass == NULL)) { 2139 return NULL; 2140 } 2141 return InitializePrimitiveClass(klass, type); 2142} 2143 2144mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2145 Primitive::Type type) { 2146 CHECK(primitive_class != NULL); 2147 // Must hold lock on object when initializing. 2148 Thread* self = Thread::Current(); 2149 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2150 ObjectLock<mirror::Class> lock(self, &sirt_class); 2151 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2152 primitive_class->SetPrimitiveType(type); 2153 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2154 const char* descriptor = Primitive::Descriptor(type); 2155 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2156 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2157 return primitive_class; 2158} 2159 2160// Create an array class (i.e. the class object for the array, not the 2161// array itself). "descriptor" looks like "[C" or "[[[[B" or 2162// "[Ljava/lang/String;". 2163// 2164// If "descriptor" refers to an array of primitives, look up the 2165// primitive type's internally-generated class object. 2166// 2167// "class_loader" is the class loader of the class that's referring to 2168// us. It's used to ensure that we're looking for the element type in 2169// the right context. It does NOT become the class loader for the 2170// array class; that always comes from the base element class. 2171// 2172// Returns NULL with an exception raised on failure. 2173mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2174 const SirtRef<mirror::ClassLoader>& class_loader) { 2175 // Identify the underlying component type 2176 CHECK_EQ('[', descriptor[0]); 2177 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2178 if (component_type.get() == nullptr) { 2179 DCHECK(self->IsExceptionPending()); 2180 return nullptr; 2181 } 2182 2183 // See if the component type is already loaded. Array classes are 2184 // always associated with the class loader of their underlying 2185 // element type -- an array of Strings goes with the loader for 2186 // java/lang/String -- so we need to look for it there. (The 2187 // caller should have checked for the existence of the class 2188 // before calling here, but they did so with *their* class loader, 2189 // not the component type's loader.) 2190 // 2191 // If we find it, the caller adds "loader" to the class' initiating 2192 // loader list, which should prevent us from going through this again. 2193 // 2194 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2195 // are the same, because our caller (FindClass) just did the 2196 // lookup. (Even if we get this wrong we still have correct behavior, 2197 // because we effectively do this lookup again when we add the new 2198 // class to the hash table --- necessary because of possible races with 2199 // other threads.) 2200 if (class_loader.get() != component_type->GetClassLoader()) { 2201 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2202 if (new_class != NULL) { 2203 return new_class; 2204 } 2205 } 2206 2207 // Fill out the fields in the Class. 2208 // 2209 // It is possible to execute some methods against arrays, because 2210 // all arrays are subclasses of java_lang_Object_, so we need to set 2211 // up a vtable. We can just point at the one in java_lang_Object_. 2212 // 2213 // Array classes are simple enough that we don't need to do a full 2214 // link step. 2215 SirtRef<mirror::Class> new_class(self, NULL); 2216 if (UNLIKELY(!init_done_)) { 2217 // Classes that were hand created, ie not by FindSystemClass 2218 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2219 new_class.reset(GetClassRoot(kClassArrayClass)); 2220 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2221 new_class.reset(GetClassRoot(kObjectArrayClass)); 2222 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2223 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2224 } else if (strcmp(descriptor, 2225 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2226 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2227 } else if (strcmp(descriptor, 2228 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2229 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2230 } else if (strcmp(descriptor, "[C") == 0) { 2231 new_class.reset(GetClassRoot(kCharArrayClass)); 2232 } else if (strcmp(descriptor, "[I") == 0) { 2233 new_class.reset(GetClassRoot(kIntArrayClass)); 2234 } 2235 } 2236 if (new_class.get() == nullptr) { 2237 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2238 if (new_class.get() == nullptr) { 2239 return nullptr; 2240 } 2241 new_class->SetComponentType(component_type.get()); 2242 } 2243 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2244 DCHECK(new_class->GetComponentType() != NULL); 2245 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2246 new_class->SetSuperClass(java_lang_Object); 2247 new_class->SetVTable(java_lang_Object->GetVTable()); 2248 new_class->SetPrimitiveType(Primitive::kPrimNot); 2249 new_class->SetClassLoader(component_type->GetClassLoader()); 2250 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2251 // don't need to set new_class->SetObjectSize(..) 2252 // because Object::SizeOf delegates to Array::SizeOf 2253 2254 2255 // All arrays have java/lang/Cloneable and java/io/Serializable as 2256 // interfaces. We need to set that up here, so that stuff like 2257 // "instanceof" works right. 2258 // 2259 // Note: The GC could run during the call to FindSystemClass, 2260 // so we need to make sure the class object is GC-valid while we're in 2261 // there. Do this by clearing the interface list so the GC will just 2262 // think that the entries are null. 2263 2264 2265 // Use the single, global copies of "interfaces" and "iftable" 2266 // (remember not to free them for arrays). 2267 CHECK(array_iftable_ != nullptr); 2268 new_class->SetIfTable(array_iftable_); 2269 2270 // Inherit access flags from the component type. 2271 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2272 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2273 access_flags &= kAccJavaFlagsMask; 2274 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2275 // and remove "interface". 2276 access_flags |= kAccAbstract | kAccFinal; 2277 access_flags &= ~kAccInterface; 2278 2279 new_class->SetAccessFlags(access_flags); 2280 2281 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2282 if (existing == nullptr) { 2283 return new_class.get(); 2284 } 2285 // Another thread must have loaded the class after we 2286 // started but before we finished. Abandon what we've 2287 // done. 2288 // 2289 // (Yes, this happens.) 2290 2291 return existing; 2292} 2293 2294mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2295 switch (type) { 2296 case 'B': 2297 return GetClassRoot(kPrimitiveByte); 2298 case 'C': 2299 return GetClassRoot(kPrimitiveChar); 2300 case 'D': 2301 return GetClassRoot(kPrimitiveDouble); 2302 case 'F': 2303 return GetClassRoot(kPrimitiveFloat); 2304 case 'I': 2305 return GetClassRoot(kPrimitiveInt); 2306 case 'J': 2307 return GetClassRoot(kPrimitiveLong); 2308 case 'S': 2309 return GetClassRoot(kPrimitiveShort); 2310 case 'Z': 2311 return GetClassRoot(kPrimitiveBoolean); 2312 case 'V': 2313 return GetClassRoot(kPrimitiveVoid); 2314 default: 2315 break; 2316 } 2317 std::string printable_type(PrintableChar(type)); 2318 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2319 return NULL; 2320} 2321 2322mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2323 size_t hash) { 2324 if (VLOG_IS_ON(class_linker)) { 2325 mirror::DexCache* dex_cache = klass->GetDexCache(); 2326 std::string source; 2327 if (dex_cache != NULL) { 2328 source += " from "; 2329 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2330 } 2331 LOG(INFO) << "Loaded class " << descriptor << source; 2332 } 2333 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2334 mirror::Class* existing = 2335 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2336 if (existing != NULL) { 2337 return existing; 2338 } 2339 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2340 // Check a class loaded with the system class loader matches one in the image if the class 2341 // is in the image. 2342 existing = LookupClassFromImage(descriptor); 2343 if (existing != NULL) { 2344 CHECK(klass == existing); 2345 } 2346 } 2347 VerifyObject(klass); 2348 class_table_.insert(std::make_pair(hash, klass)); 2349 if (log_new_class_table_roots_) { 2350 new_class_roots_.push_back(std::make_pair(hash, klass)); 2351 } 2352 return NULL; 2353} 2354 2355bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2356 size_t hash = Hash(descriptor); 2357 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2358 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2359 ++it) { 2360 mirror::Class* klass = it->second; 2361 ClassHelper kh(klass); 2362 if ((klass->GetClassLoader() == class_loader) && 2363 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2364 class_table_.erase(it); 2365 return true; 2366 } 2367 } 2368 return false; 2369} 2370 2371mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2372 const mirror::ClassLoader* class_loader) { 2373 size_t hash = Hash(descriptor); 2374 { 2375 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2376 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2377 if (result != NULL) { 2378 return result; 2379 } 2380 } 2381 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2382 return NULL; 2383 } else { 2384 // Lookup failed but need to search dex_caches_. 2385 mirror::Class* result = LookupClassFromImage(descriptor); 2386 if (result != NULL) { 2387 InsertClass(descriptor, result, hash); 2388 } else { 2389 // Searching the image dex files/caches failed, we don't want to get into this situation 2390 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2391 // classes into the class table. 2392 const int32_t kMaxFailedDexCacheLookups = 1000; 2393 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2394 MoveImageClassesToClassTable(); 2395 } 2396 } 2397 return result; 2398 } 2399} 2400 2401mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2402 const mirror::ClassLoader* class_loader, 2403 size_t hash) { 2404 auto end = class_table_.end(); 2405 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2406 mirror::Class* klass = it->second; 2407 ClassHelper kh(klass); 2408 if ((klass->GetClassLoader() == class_loader) && 2409 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2410 if (kIsDebugBuild) { 2411 // Check for duplicates in the table. 2412 for (++it; it != end && it->first == hash; ++it) { 2413 mirror::Class* klass2 = it->second; 2414 ClassHelper kh(klass2); 2415 CHECK(!((klass2->GetClassLoader() == class_loader) && 2416 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2417 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2418 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2419 } 2420 } 2421 return klass; 2422 } 2423 } 2424 return NULL; 2425} 2426 2427static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2428 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2429 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2430 CHECK(image != NULL); 2431 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2432 return root->AsObjectArray<mirror::DexCache>(); 2433} 2434 2435void ClassLinker::MoveImageClassesToClassTable() { 2436 Thread* self = Thread::Current(); 2437 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2438 if (!dex_cache_image_class_lookup_required_) { 2439 return; // All dex cache classes are already in the class table. 2440 } 2441 const char* old_no_suspend_cause = 2442 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2443 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2444 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2445 mirror::DexCache* dex_cache = dex_caches->Get(i); 2446 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2447 for (int32_t j = 0; j < types->GetLength(); j++) { 2448 mirror::Class* klass = types->Get(j); 2449 if (klass != NULL) { 2450 ClassHelper kh(klass); 2451 DCHECK(klass->GetClassLoader() == NULL); 2452 const char* descriptor = kh.GetDescriptor(); 2453 size_t hash = Hash(descriptor); 2454 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2455 if (existing != NULL) { 2456 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2457 << PrettyClassAndClassLoader(klass); 2458 } else { 2459 class_table_.insert(std::make_pair(hash, klass)); 2460 if (log_new_class_table_roots_) { 2461 new_class_roots_.push_back(std::make_pair(hash, klass)); 2462 } 2463 } 2464 } 2465 } 2466 } 2467 dex_cache_image_class_lookup_required_ = false; 2468 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2469} 2470 2471mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2472 Thread* self = Thread::Current(); 2473 const char* old_no_suspend_cause = 2474 self->StartAssertNoThreadSuspension("Image class lookup"); 2475 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2476 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2477 mirror::DexCache* dex_cache = dex_caches->Get(i); 2478 const DexFile* dex_file = dex_cache->GetDexFile(); 2479 // Try binary searching the string/type index. 2480 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2481 if (string_id != NULL) { 2482 const DexFile::TypeId* type_id = 2483 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2484 if (type_id != NULL) { 2485 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2486 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2487 if (klass != NULL) { 2488 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2489 return klass; 2490 } 2491 } 2492 } 2493 } 2494 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2495 return NULL; 2496} 2497 2498void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2499 result.clear(); 2500 if (dex_cache_image_class_lookup_required_) { 2501 MoveImageClassesToClassTable(); 2502 } 2503 size_t hash = Hash(descriptor); 2504 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2505 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2506 it != end && it->first == hash; ++it) { 2507 mirror::Class* klass = it->second; 2508 ClassHelper kh(klass); 2509 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2510 result.push_back(klass); 2511 } 2512 } 2513} 2514 2515void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2516 // TODO: assert that the monitor on the Class is held 2517 Thread* self = Thread::Current(); 2518 ObjectLock<mirror::Class> lock(self, &klass); 2519 2520 // Don't attempt to re-verify if already sufficiently verified. 2521 if (klass->IsVerified() || 2522 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2523 return; 2524 } 2525 2526 // The class might already be erroneous, for example at compile time if we attempted to verify 2527 // this class as a parent to another. 2528 if (klass->IsErroneous()) { 2529 ThrowEarlierClassFailure(klass.get()); 2530 return; 2531 } 2532 2533 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2534 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2535 } else { 2536 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2537 << PrettyClass(klass.get()); 2538 CHECK(!Runtime::Current()->IsCompiler()); 2539 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2540 } 2541 2542 // Skip verification if disabled. 2543 if (!Runtime::Current()->IsVerificationEnabled()) { 2544 klass->SetStatus(mirror::Class::kStatusVerified, self); 2545 return; 2546 } 2547 2548 // Verify super class. 2549 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2550 if (super.get() != NULL) { 2551 // Acquire lock to prevent races on verifying the super class. 2552 ObjectLock<mirror::Class> lock(self, &super); 2553 2554 if (!super->IsVerified() && !super->IsErroneous()) { 2555 VerifyClass(super); 2556 } 2557 if (!super->IsCompileTimeVerified()) { 2558 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2559 PrettyDescriptor(klass.get()).c_str(), 2560 PrettyDescriptor(super.get()).c_str())); 2561 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2562 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2563 if (cause.get() != nullptr) { 2564 self->ClearException(); 2565 } 2566 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2567 if (cause.get() != nullptr) { 2568 self->GetException(nullptr)->SetCause(cause.get()); 2569 } 2570 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2571 if (Runtime::Current()->IsCompiler()) { 2572 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2573 } 2574 klass->SetStatus(mirror::Class::kStatusError, self); 2575 return; 2576 } 2577 } 2578 2579 // Try to use verification information from the oat file, otherwise do runtime verification. 2580 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2581 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2582 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2583 if (oat_file_class_status == mirror::Class::kStatusError) { 2584 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2585 << PrettyDescriptor(klass.get()) << " in " 2586 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2587 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2588 PrettyDescriptor(klass.get()).c_str()); 2589 klass->SetStatus(mirror::Class::kStatusError, self); 2590 return; 2591 } 2592 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2593 std::string error_msg; 2594 if (!preverified) { 2595 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2596 Runtime::Current()->IsCompiler(), 2597 &error_msg); 2598 } 2599 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2600 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2601 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2602 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2603 << " because: " << error_msg; 2604 } 2605 self->AssertNoPendingException(); 2606 // Make sure all classes referenced by catch blocks are resolved. 2607 ResolveClassExceptionHandlerTypes(dex_file, klass); 2608 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2609 // Even though there were no verifier failures we need to respect whether the super-class 2610 // was verified or requiring runtime reverification. 2611 if (super.get() == NULL || super->IsVerified()) { 2612 klass->SetStatus(mirror::Class::kStatusVerified, self); 2613 } else { 2614 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2615 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2616 // Pretend a soft failure occured so that we don't consider the class verified below. 2617 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2618 } 2619 } else { 2620 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2621 // Soft failures at compile time should be retried at runtime. Soft 2622 // failures at runtime will be handled by slow paths in the generated 2623 // code. Set status accordingly. 2624 if (Runtime::Current()->IsCompiler()) { 2625 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2626 } else { 2627 klass->SetStatus(mirror::Class::kStatusVerified, self); 2628 } 2629 } 2630 } else { 2631 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2632 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2633 << " because: " << error_msg; 2634 self->AssertNoPendingException(); 2635 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2636 klass->SetStatus(mirror::Class::kStatusError, self); 2637 } 2638 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2639 // Class is verified so we don't need to do any access check on its methods. 2640 // Let the interpreter know it by setting the kAccPreverified flag onto each 2641 // method. 2642 // Note: we're going here during compilation and at runtime. When we set the 2643 // kAccPreverified flag when compiling image classes, the flag is recorded 2644 // in the image and is set when loading the image. 2645 klass->SetPreverifiedFlagOnAllMethods(); 2646 } 2647} 2648 2649bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2650 mirror::Class::Status& oat_file_class_status) { 2651 // If we're compiling, we can only verify the class using the oat file if 2652 // we are not compiling the image or if the class we're verifying is not part of 2653 // the app. In other words, we will only check for preverification of bootclasspath 2654 // classes. 2655 if (Runtime::Current()->IsCompiler()) { 2656 // Are we compiling the bootclasspath? 2657 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2658 return false; 2659 } 2660 // We are compiling an app (not the image). 2661 2662 // Is this an app class? (I.e. not a bootclasspath class) 2663 if (klass->GetClassLoader() != NULL) { 2664 return false; 2665 } 2666 } 2667 2668 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2669 // Make this work with gtests, which do not set up the image properly. 2670 // TODO: we should clean up gtests to set up the image path properly. 2671 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2672 return false; 2673 } 2674 2675 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2676 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2677 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2678 &dex_location_checksum); 2679 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2680 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2681 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2682 CHECK(oat_class.get() != NULL) 2683 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2684 << ClassHelper(klass).GetDescriptor(); 2685 oat_file_class_status = oat_class->GetStatus(); 2686 if (oat_file_class_status == mirror::Class::kStatusVerified || 2687 oat_file_class_status == mirror::Class::kStatusInitialized) { 2688 return true; 2689 } 2690 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2691 // Compile time verification failed with a soft error. Compile time verification can fail 2692 // because we have incomplete type information. Consider the following: 2693 // class ... { 2694 // Foo x; 2695 // .... () { 2696 // if (...) { 2697 // v1 gets assigned a type of resolved class Foo 2698 // } else { 2699 // v1 gets assigned a type of unresolved class Bar 2700 // } 2701 // iput x = v1 2702 // } } 2703 // when we merge v1 following the if-the-else it results in Conflict 2704 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2705 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2706 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2707 // at compile time). 2708 return false; 2709 } 2710 if (oat_file_class_status == mirror::Class::kStatusError) { 2711 // Compile time verification failed with a hard error. This is caused by invalid instructions 2712 // in the class. These errors are unrecoverable. 2713 return false; 2714 } 2715 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2716 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2717 // not loading the class. 2718 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2719 // isn't a problem and this case shouldn't occur 2720 return false; 2721 } 2722 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2723 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2724 << ClassHelper(klass).GetDescriptor(); 2725 2726 return false; 2727} 2728 2729void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2730 const SirtRef<mirror::Class>& klass) { 2731 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2732 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2733 } 2734 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2735 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2736 } 2737} 2738 2739void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2740 mirror::ArtMethod* method) { 2741 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2742 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2743 if (code_item == NULL) { 2744 return; // native or abstract method 2745 } 2746 if (code_item->tries_size_ == 0) { 2747 return; // nothing to process 2748 } 2749 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2750 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2751 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2752 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2753 CatchHandlerIterator iterator(handlers_ptr); 2754 for (; iterator.HasNext(); iterator.Next()) { 2755 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2756 // unresolved exception types will be ignored by exception delivery 2757 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2758 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2759 if (exception_type == NULL) { 2760 DCHECK(Thread::Current()->IsExceptionPending()); 2761 Thread::Current()->ClearException(); 2762 } 2763 } 2764 } 2765 handlers_ptr = iterator.EndDataPointer(); 2766 } 2767} 2768 2769static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2770static void CheckProxyMethod(mirror::ArtMethod* method, 2771 SirtRef<mirror::ArtMethod>& prototype); 2772 2773mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2774 jobjectArray interfaces, jobject loader, 2775 jobjectArray methods, jobjectArray throws) { 2776 Thread* self = soa.Self(); 2777 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2778 sizeof(mirror::SynthesizedProxyClass))); 2779 if (klass.get() == NULL) { 2780 CHECK(self->IsExceptionPending()); // OOME. 2781 return NULL; 2782 } 2783 DCHECK(klass->GetClass() != NULL); 2784 klass->SetObjectSize(sizeof(mirror::Proxy)); 2785 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2786 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2787 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2788 klass->SetName(soa.Decode<mirror::String*>(name)); 2789 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2790 klass->SetDexCache(proxy_class->GetDexCache()); 2791 klass->SetStatus(mirror::Class::kStatusIdx, self); 2792 2793 // Instance fields are inherited, but we add a couple of static fields... 2794 { 2795 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2796 if (UNLIKELY(sfields == NULL)) { 2797 CHECK(self->IsExceptionPending()); // OOME. 2798 return NULL; 2799 } 2800 klass->SetSFields(sfields); 2801 } 2802 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2803 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2804 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2805 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2806 CHECK(self->IsExceptionPending()); // OOME. 2807 return NULL; 2808 } 2809 klass->SetStaticField(0, interfaces_sfield.get()); 2810 interfaces_sfield->SetDexFieldIndex(0); 2811 interfaces_sfield->SetDeclaringClass(klass.get()); 2812 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2813 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2814 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2815 if (UNLIKELY(throws_sfield.get() == NULL)) { 2816 CHECK(self->IsExceptionPending()); // OOME. 2817 return NULL; 2818 } 2819 klass->SetStaticField(1, throws_sfield.get()); 2820 throws_sfield->SetDexFieldIndex(1); 2821 throws_sfield->SetDeclaringClass(klass.get()); 2822 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2823 2824 // Proxies have 1 direct method, the constructor 2825 { 2826 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2827 if (UNLIKELY(directs == NULL)) { 2828 CHECK(self->IsExceptionPending()); // OOME. 2829 return NULL; 2830 } 2831 klass->SetDirectMethods(directs); 2832 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2833 if (UNLIKELY(constructor == NULL)) { 2834 CHECK(self->IsExceptionPending()); // OOME. 2835 return NULL; 2836 } 2837 klass->SetDirectMethod(0, constructor); 2838 } 2839 2840 // Create virtual method using specified prototypes. 2841 size_t num_virtual_methods = 2842 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2843 { 2844 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2845 if (UNLIKELY(virtuals == NULL)) { 2846 CHECK(self->IsExceptionPending()); // OOME. 2847 return NULL; 2848 } 2849 klass->SetVirtualMethods(virtuals); 2850 } 2851 for (size_t i = 0; i < num_virtual_methods; ++i) { 2852 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2853 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2854 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2855 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2856 if (UNLIKELY(clone == NULL)) { 2857 CHECK(self->IsExceptionPending()); // OOME. 2858 return NULL; 2859 } 2860 klass->SetVirtualMethod(i, clone); 2861 } 2862 2863 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2864 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2865 self->AssertNoPendingException(); 2866 2867 { 2868 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2869 // Link the fields and virtual methods, creating vtable and iftables 2870 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2871 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2872 if (!LinkClass(self, klass, sirt_interfaces)) { 2873 klass->SetStatus(mirror::Class::kStatusError, self); 2874 return nullptr; 2875 } 2876 2877 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2878 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2879 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2880 } 2881 2882 // sanity checks 2883 if (kIsDebugBuild) { 2884 CHECK(klass->GetIFields() == NULL); 2885 CheckProxyConstructor(klass->GetDirectMethod(0)); 2886 for (size_t i = 0; i < num_virtual_methods; ++i) { 2887 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2888 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2889 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2890 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2891 } 2892 2893 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2894 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2895 decoded_name->ToModifiedUtf8().c_str())); 2896 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2897 2898 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2899 decoded_name->ToModifiedUtf8().c_str())); 2900 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2901 2902 mirror::SynthesizedProxyClass* synth_proxy_class = 2903 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2904 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2905 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2906 } 2907 std::string descriptor(GetDescriptorForProxy(klass.get())); 2908 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2909 CHECK(existing == nullptr); 2910 return klass.get(); 2911} 2912 2913std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2914 DCHECK(proxy_class->IsProxyClass()); 2915 mirror::String* name = proxy_class->GetName(); 2916 DCHECK(name != NULL); 2917 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2918} 2919 2920mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2921 mirror::ArtMethod* proxy_method) { 2922 DCHECK(proxy_class->IsProxyClass()); 2923 DCHECK(proxy_method->IsProxyMethod()); 2924 // Locate the dex cache of the original interface/Object 2925 mirror::DexCache* dex_cache = NULL; 2926 { 2927 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2928 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2929 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2930 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2931 dex_cache = dex_caches_[i]; 2932 break; 2933 } 2934 } 2935 } 2936 CHECK(dex_cache != NULL); 2937 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2938 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2939 CHECK(resolved_method != NULL); 2940 return resolved_method; 2941} 2942 2943 2944mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2945 const SirtRef<mirror::Class>& klass, 2946 mirror::Class* proxy_class) { 2947 // Create constructor for Proxy that must initialize h 2948 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2949 proxy_class->GetDirectMethods(); 2950 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2951 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2952 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2953 // code_ too) 2954 mirror::ArtMethod* constructor = 2955 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2956 if (constructor == NULL) { 2957 CHECK(self->IsExceptionPending()); // OOME. 2958 return NULL; 2959 } 2960 // Make this constructor public and fix the class to be our Proxy version 2961 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2962 constructor->SetDeclaringClass(klass.get()); 2963 return constructor; 2964} 2965 2966static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2967 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2968 CHECK(constructor->IsConstructor()); 2969 MethodHelper mh(constructor); 2970 CHECK_STREQ(mh.GetName(), "<init>"); 2971 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2972 DCHECK(constructor->IsPublic()); 2973} 2974 2975mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2976 const SirtRef<mirror::Class>& klass, 2977 const SirtRef<mirror::ArtMethod>& prototype) { 2978 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2979 // prototype method 2980 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2981 prototype.get()); 2982 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2983 // as necessary 2984 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2985 if (UNLIKELY(method == NULL)) { 2986 CHECK(self->IsExceptionPending()); // OOME. 2987 return NULL; 2988 } 2989 2990 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2991 // the intersection of throw exceptions as defined in Proxy 2992 method->SetDeclaringClass(klass.get()); 2993 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2994 2995 // At runtime the method looks like a reference and argument saving method, clone the code 2996 // related parameters from this method. 2997 mirror::ArtMethod* refs_and_args = 2998 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2999 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 3000 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 3001 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 3002 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3003 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3004 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3005 3006 return method; 3007} 3008 3009static void CheckProxyMethod(mirror::ArtMethod* method, 3010 SirtRef<mirror::ArtMethod>& prototype) 3011 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3012 // Basic sanity 3013 CHECK(!prototype->IsFinal()); 3014 CHECK(method->IsFinal()); 3015 CHECK(!method->IsAbstract()); 3016 3017 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3018 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3019 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3020 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3021 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3022 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3023 3024 MethodHelper mh(method); 3025 MethodHelper mh2(prototype.get()); 3026 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3027 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3028 // More complex sanity - via dex cache 3029 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3030} 3031 3032static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3033 bool can_init_parents) 3034 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3035 if (can_init_statics && can_init_parents) { 3036 return true; 3037 } 3038 if (!can_init_statics) { 3039 // Check if there's a class initializer. 3040 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3041 if (clinit != NULL) { 3042 return false; 3043 } 3044 // Check if there are encoded static values needing initialization. 3045 if (klass->NumStaticFields() != 0) { 3046 ClassHelper kh(klass); 3047 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3048 DCHECK(dex_class_def != NULL); 3049 if (dex_class_def->static_values_off_ != 0) { 3050 return false; 3051 } 3052 } 3053 } 3054 if (!klass->IsInterface() && klass->HasSuperClass()) { 3055 mirror::Class* super_class = klass->GetSuperClass(); 3056 if (!can_init_parents && !super_class->IsInitialized()) { 3057 return false; 3058 } else { 3059 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3060 return false; 3061 } 3062 } 3063 } 3064 return true; 3065} 3066 3067bool ClassLinker::IsInitialized() const { 3068 return init_done_; 3069} 3070 3071bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3072 bool can_init_parents) { 3073 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3074 3075 // Are we already initialized and therefore done? 3076 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3077 // an initialized class will never change its state. 3078 if (klass->IsInitialized()) { 3079 return true; 3080 } 3081 3082 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3083 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3084 return false; 3085 } 3086 3087 Thread* self = Thread::Current(); 3088 uint64_t t0; 3089 { 3090 ObjectLock<mirror::Class> lock(self, &klass); 3091 3092 // Re-check under the lock in case another thread initialized ahead of us. 3093 if (klass->IsInitialized()) { 3094 return true; 3095 } 3096 3097 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3098 if (klass->IsErroneous()) { 3099 ThrowEarlierClassFailure(klass.get()); 3100 return false; 3101 } 3102 3103 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3104 3105 if (!klass->IsVerified()) { 3106 VerifyClass(klass); 3107 if (!klass->IsVerified()) { 3108 // We failed to verify, expect either the klass to be erroneous or verification failed at 3109 // compile time. 3110 if (klass->IsErroneous()) { 3111 CHECK(self->IsExceptionPending()); 3112 } else { 3113 CHECK(Runtime::Current()->IsCompiler()); 3114 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3115 } 3116 return false; 3117 } 3118 } 3119 3120 // If the class is kStatusInitializing, either this thread is 3121 // initializing higher up the stack or another thread has beat us 3122 // to initializing and we need to wait. Either way, this 3123 // invocation of InitializeClass will not be responsible for 3124 // running <clinit> and will return. 3125 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3126 // We caught somebody else in the act; was it us? 3127 if (klass->GetClinitThreadId() == self->GetTid()) { 3128 // Yes. That's fine. Return so we can continue initializing. 3129 return true; 3130 } 3131 // No. That's fine. Wait for another thread to finish initializing. 3132 return WaitForInitializeClass(klass, self, lock); 3133 } 3134 3135 if (!ValidateSuperClassDescriptors(klass)) { 3136 klass->SetStatus(mirror::Class::kStatusError, self); 3137 return false; 3138 } 3139 3140 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3141 3142 // From here out other threads may observe that we're initializing and so changes of state 3143 // require the a notification. 3144 klass->SetClinitThreadId(self->GetTid()); 3145 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3146 3147 t0 = NanoTime(); 3148 } 3149 3150 // Initialize super classes, must be done while initializing for the JLS. 3151 if (!klass->IsInterface() && klass->HasSuperClass()) { 3152 mirror::Class* super_class = klass->GetSuperClass(); 3153 if (!super_class->IsInitialized()) { 3154 CHECK(!super_class->IsInterface()); 3155 CHECK(can_init_parents); 3156 SirtRef<mirror::Class> sirt_super(self, super_class); 3157 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3158 if (!super_initialized) { 3159 // The super class was verified ahead of entering initializing, we should only be here if 3160 // the super class became erroneous due to initialization. 3161 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3162 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3163 << " that has unexpected status " << sirt_super->GetStatus() 3164 << "\nPending exception:\n" 3165 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3166 ObjectLock<mirror::Class> lock(self, &klass); 3167 // Initialization failed because the super-class is erroneous. 3168 klass->SetStatus(mirror::Class::kStatusError, self); 3169 return false; 3170 } 3171 } 3172 } 3173 3174 if (klass->NumStaticFields() > 0) { 3175 ClassHelper kh(klass.get()); 3176 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3177 CHECK(dex_class_def != NULL); 3178 const DexFile& dex_file = kh.GetDexFile(); 3179 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3180 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3181 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3182 this, *dex_class_def); 3183 if (it.HasNext()) { 3184 CHECK(can_init_statics); 3185 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3186 SafeMap<uint32_t, mirror::ArtField*> field_map; 3187 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3188 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3189 if (Runtime::Current()->IsActiveTransaction()) { 3190 it.ReadValueToField<true>(field_map.Get(i)); 3191 } else { 3192 it.ReadValueToField<false>(field_map.Get(i)); 3193 } 3194 } 3195 } 3196 } 3197 3198 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3199 if (clinit != NULL) { 3200 CHECK(can_init_statics); 3201 if (LIKELY(Runtime::Current()->IsStarted())) { 3202 JValue result; 3203 clinit->Invoke(self, NULL, 0, &result, "V"); 3204 } else { 3205 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3206 } 3207 } 3208 3209 uint64_t t1 = NanoTime(); 3210 3211 bool success = true; 3212 { 3213 ObjectLock<mirror::Class> lock(self, &klass); 3214 3215 if (self->IsExceptionPending()) { 3216 WrapExceptionInInitializer(); 3217 klass->SetStatus(mirror::Class::kStatusError, self); 3218 success = false; 3219 } else { 3220 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3221 RuntimeStats* thread_stats = self->GetStats(); 3222 ++global_stats->class_init_count; 3223 ++thread_stats->class_init_count; 3224 global_stats->class_init_time_ns += (t1 - t0); 3225 thread_stats->class_init_time_ns += (t1 - t0); 3226 // Set the class as initialized except if failed to initialize static fields. 3227 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3228 if (VLOG_IS_ON(class_linker)) { 3229 ClassHelper kh(klass.get()); 3230 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3231 } 3232 // Opportunistically set static method trampolines to their destination. 3233 FixupStaticTrampolines(klass.get()); 3234 } 3235 } 3236 return success; 3237} 3238 3239bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3240 ObjectLock<mirror::Class>& lock) 3241 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3242 while (true) { 3243 self->AssertNoPendingException(); 3244 CHECK(!klass->IsInitialized()); 3245 lock.WaitIgnoringInterrupts(); 3246 3247 // When we wake up, repeat the test for init-in-progress. If 3248 // there's an exception pending (only possible if 3249 // "interruptShouldThrow" was set), bail out. 3250 if (self->IsExceptionPending()) { 3251 WrapExceptionInInitializer(); 3252 klass->SetStatus(mirror::Class::kStatusError, self); 3253 return false; 3254 } 3255 // Spurious wakeup? Go back to waiting. 3256 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3257 continue; 3258 } 3259 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3260 // Compile time initialization failed. 3261 return false; 3262 } 3263 if (klass->IsErroneous()) { 3264 // The caller wants an exception, but it was thrown in a 3265 // different thread. Synthesize one here. 3266 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3267 PrettyDescriptor(klass.get()).c_str()); 3268 return false; 3269 } 3270 if (klass->IsInitialized()) { 3271 return true; 3272 } 3273 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3274 << klass->GetStatus(); 3275 } 3276 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3277} 3278 3279bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3280 if (klass->IsInterface()) { 3281 return true; 3282 } 3283 Thread* self = Thread::Current(); 3284 // begin with the methods local to the superclass 3285 if (klass->HasSuperClass() && 3286 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3287 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3288 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3289 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3290 if (method != super->GetVTable()->Get(i) && 3291 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3292 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3293 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3294 PrettyDescriptor(super.get()).c_str()); 3295 return false; 3296 } 3297 } 3298 } 3299 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3300 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3301 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3302 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3303 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3304 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3305 method->GetDeclaringClass())) { 3306 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3307 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3308 PrettyMethod(method).c_str(), 3309 PrettyDescriptor(interface.get()).c_str()); 3310 return false; 3311 } 3312 } 3313 } 3314 } 3315 return true; 3316} 3317 3318// Returns true if classes referenced by the signature of the method are the 3319// same classes in klass1 as they are in klass2. 3320bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3321 mirror::ArtMethod* method, 3322 mirror::Class* klass1, 3323 mirror::Class* klass2) { 3324 if (klass1 == klass2) { 3325 return true; 3326 } 3327 CHECK(klass1 != nullptr); 3328 CHECK(klass2 != nullptr); 3329 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3330 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3331 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3332 const DexFile::ProtoId& proto_id = 3333 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3334 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3335 const char* descriptor = it.GetDescriptor(); 3336 if (descriptor == nullptr) { 3337 break; 3338 } 3339 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3340 // Found a non-primitive type. 3341 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3342 return false; 3343 } 3344 } 3345 } 3346 // Check the return type 3347 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3348 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3349 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3350 return false; 3351 } 3352 } 3353 return true; 3354} 3355 3356// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3357bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3358 SirtRef<mirror::ClassLoader>& loader1, 3359 SirtRef<mirror::ClassLoader>& loader2) { 3360 CHECK(descriptor != nullptr); 3361 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3362 if (found1.get() == nullptr) { 3363 self->ClearException(); 3364 } 3365 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3366 if (found2 == nullptr) { 3367 self->ClearException(); 3368 } 3369 return found1.get() == found2; 3370} 3371 3372bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3373 bool can_init_parents) { 3374 DCHECK(c.get() != NULL); 3375 if (c->IsInitialized()) { 3376 return true; 3377 } 3378 3379 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3380 if (!success) { 3381 if (can_init_fields && can_init_parents) { 3382 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3383 } 3384 } 3385 return success; 3386} 3387 3388void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3389 mirror::Class* c, 3390 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3391 const byte* class_data = dex_file.GetClassData(dex_class_def); 3392 ClassDataItemIterator it(dex_file, class_data); 3393 Thread* self = Thread::Current(); 3394 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3395 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3396 CHECK(!kMovingFields); 3397 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3398 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3399 } 3400} 3401 3402bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3403 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3404 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3405 if (!LinkSuperClass(klass)) { 3406 return false; 3407 } 3408 if (!LinkMethods(klass, interfaces)) { 3409 return false; 3410 } 3411 if (!LinkInstanceFields(klass)) { 3412 return false; 3413 } 3414 if (!LinkStaticFields(klass)) { 3415 return false; 3416 } 3417 CreateReferenceInstanceOffsets(klass); 3418 CreateReferenceStaticOffsets(klass); 3419 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3420 klass->SetStatus(mirror::Class::kStatusResolved, self); 3421 return true; 3422} 3423 3424bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3425 const DexFile& dex_file) { 3426 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3427 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3428 uint16_t super_class_idx = class_def.superclass_idx_; 3429 if (super_class_idx != DexFile::kDexNoIndex16) { 3430 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3431 if (super_class == NULL) { 3432 DCHECK(Thread::Current()->IsExceptionPending()); 3433 return false; 3434 } 3435 // Verify 3436 if (!klass->CanAccess(super_class)) { 3437 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3438 PrettyDescriptor(super_class).c_str(), 3439 PrettyDescriptor(klass.get()).c_str()); 3440 return false; 3441 } 3442 klass->SetSuperClass(super_class); 3443 } 3444 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3445 if (interfaces != NULL) { 3446 for (size_t i = 0; i < interfaces->Size(); i++) { 3447 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3448 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3449 if (interface == NULL) { 3450 DCHECK(Thread::Current()->IsExceptionPending()); 3451 return false; 3452 } 3453 // Verify 3454 if (!klass->CanAccess(interface)) { 3455 // TODO: the RI seemed to ignore this in my testing. 3456 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3457 PrettyDescriptor(interface).c_str(), 3458 PrettyDescriptor(klass.get()).c_str()); 3459 return false; 3460 } 3461 } 3462 } 3463 // Mark the class as loaded. 3464 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3465 return true; 3466} 3467 3468bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3469 CHECK(!klass->IsPrimitive()); 3470 mirror::Class* super = klass->GetSuperClass(); 3471 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3472 if (super != NULL) { 3473 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3474 return false; 3475 } 3476 return true; 3477 } 3478 if (super == NULL) { 3479 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3480 PrettyDescriptor(klass.get()).c_str()); 3481 return false; 3482 } 3483 // Verify 3484 if (super->IsFinal() || super->IsInterface()) { 3485 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3486 PrettyDescriptor(super).c_str(), 3487 PrettyDescriptor(klass.get()).c_str(), 3488 super->IsFinal() ? "declared final" : "an interface"); 3489 return false; 3490 } 3491 if (!klass->CanAccess(super)) { 3492 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3493 PrettyDescriptor(super).c_str(), 3494 PrettyDescriptor(klass.get()).c_str()); 3495 return false; 3496 } 3497 3498 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3499 if (super->IsFinalizable()) { 3500 klass->SetFinalizable(); 3501 } 3502 3503 // Inherit reference flags (if any) from the superclass. 3504 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3505 if (reference_flags != 0) { 3506 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3507 } 3508 // Disallow custom direct subclasses of java.lang.ref.Reference. 3509 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3510 ThrowLinkageError(klass.get(), 3511 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3512 PrettyDescriptor(klass.get()).c_str()); 3513 return false; 3514 } 3515 3516 if (kIsDebugBuild) { 3517 // Ensure super classes are fully resolved prior to resolving fields.. 3518 while (super != NULL) { 3519 CHECK(super->IsResolved()); 3520 super = super->GetSuperClass(); 3521 } 3522 } 3523 return true; 3524} 3525 3526// Populate the class vtable and itable. Compute return type indices. 3527bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3528 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3529 if (klass->IsInterface()) { 3530 // No vtable. 3531 size_t count = klass->NumVirtualMethods(); 3532 if (!IsUint(16, count)) { 3533 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3534 return false; 3535 } 3536 for (size_t i = 0; i < count; ++i) { 3537 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3538 } 3539 // Link interface method tables 3540 return LinkInterfaceMethods(klass, interfaces); 3541 } else { 3542 // Link virtual and interface method tables 3543 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3544 } 3545 return true; 3546} 3547 3548bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3549 Thread* self = Thread::Current(); 3550 if (klass->HasSuperClass()) { 3551 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3552 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3553 CHECK_LE(actual_count, max_count); 3554 // TODO: do not assign to the vtable field until it is fully constructed. 3555 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3556 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3557 if (UNLIKELY(vtable.get() == NULL)) { 3558 CHECK(self->IsExceptionPending()); // OOME. 3559 return false; 3560 } 3561 // See if any of our virtual methods override the superclass. 3562 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3563 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3564 MethodHelper local_mh(local_method); 3565 size_t j = 0; 3566 for (; j < actual_count; ++j) { 3567 mirror::ArtMethod* super_method = vtable->Get(j); 3568 MethodHelper super_mh(super_method); 3569 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3570 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3571 if (super_method->IsFinal()) { 3572 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3573 PrettyMethod(local_method).c_str(), 3574 super_mh.GetDeclaringClassDescriptor()); 3575 return false; 3576 } 3577 vtable->Set<false>(j, local_method); 3578 local_method->SetMethodIndex(j); 3579 break; 3580 } else { 3581 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3582 << " would have incorrectly overridden the package-private method in " 3583 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3584 } 3585 } 3586 } 3587 if (j == actual_count) { 3588 // Not overriding, append. 3589 vtable->Set<false>(actual_count, local_method); 3590 local_method->SetMethodIndex(actual_count); 3591 actual_count += 1; 3592 } 3593 } 3594 if (!IsUint(16, actual_count)) { 3595 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3596 return false; 3597 } 3598 // Shrink vtable if possible 3599 CHECK_LE(actual_count, max_count); 3600 if (actual_count < max_count) { 3601 vtable.reset(vtable->CopyOf(self, actual_count)); 3602 if (UNLIKELY(vtable.get() == NULL)) { 3603 CHECK(self->IsExceptionPending()); // OOME. 3604 return false; 3605 } 3606 } 3607 klass->SetVTable(vtable.get()); 3608 } else { 3609 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3610 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3611 if (!IsUint(16, num_virtual_methods)) { 3612 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3613 return false; 3614 } 3615 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3616 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3617 if (UNLIKELY(vtable.get() == NULL)) { 3618 CHECK(self->IsExceptionPending()); // OOME. 3619 return false; 3620 } 3621 for (size_t i = 0; i < num_virtual_methods; ++i) { 3622 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3623 vtable->Set<false>(i, virtual_method); 3624 virtual_method->SetMethodIndex(i & 0xFFFF); 3625 } 3626 klass->SetVTable(vtable.get()); 3627 } 3628 return true; 3629} 3630 3631bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3632 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3633 // Set the imt table to be all conflicts by default. 3634 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3635 size_t super_ifcount; 3636 if (klass->HasSuperClass()) { 3637 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3638 } else { 3639 super_ifcount = 0; 3640 } 3641 size_t ifcount = super_ifcount; 3642 uint32_t num_interfaces; 3643 { 3644 ClassHelper kh(klass.get()); 3645 num_interfaces = 3646 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3647 ifcount += num_interfaces; 3648 for (size_t i = 0; i < num_interfaces; i++) { 3649 mirror::Class* interface = 3650 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3651 ifcount += interface->GetIfTableCount(); 3652 } 3653 } 3654 if (ifcount == 0) { 3655 // Class implements no interfaces. 3656 DCHECK_EQ(klass->GetIfTableCount(), 0); 3657 DCHECK(klass->GetIfTable() == NULL); 3658 return true; 3659 } 3660 if (ifcount == super_ifcount) { 3661 // Class implements same interfaces as parent, are any of these not marker interfaces? 3662 bool has_non_marker_interface = false; 3663 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3664 for (size_t i = 0; i < ifcount; ++i) { 3665 if (super_iftable->GetMethodArrayCount(i) > 0) { 3666 has_non_marker_interface = true; 3667 break; 3668 } 3669 } 3670 if (!has_non_marker_interface) { 3671 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3672 klass->SetIfTable(super_iftable); 3673 return true; 3674 } 3675 } 3676 Thread* self = Thread::Current(); 3677 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3678 if (UNLIKELY(iftable.get() == NULL)) { 3679 CHECK(self->IsExceptionPending()); // OOME. 3680 return false; 3681 } 3682 if (super_ifcount != 0) { 3683 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3684 for (size_t i = 0; i < super_ifcount; i++) { 3685 mirror::Class* super_interface = super_iftable->GetInterface(i); 3686 iftable->SetInterface(i, super_interface); 3687 } 3688 } 3689 // Flatten the interface inheritance hierarchy. 3690 size_t idx = super_ifcount; 3691 for (size_t i = 0; i < num_interfaces; i++) { 3692 ClassHelper kh(klass.get()); 3693 mirror::Class* interface = 3694 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3695 DCHECK(interface != NULL); 3696 if (!interface->IsInterface()) { 3697 ClassHelper ih(interface); 3698 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3699 PrettyDescriptor(klass.get()).c_str(), 3700 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3701 return false; 3702 } 3703 // Check if interface is already in iftable 3704 bool duplicate = false; 3705 for (size_t j = 0; j < idx; j++) { 3706 mirror::Class* existing_interface = iftable->GetInterface(j); 3707 if (existing_interface == interface) { 3708 duplicate = true; 3709 break; 3710 } 3711 } 3712 if (!duplicate) { 3713 // Add this non-duplicate interface. 3714 iftable->SetInterface(idx++, interface); 3715 // Add this interface's non-duplicate super-interfaces. 3716 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3717 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3718 bool super_duplicate = false; 3719 for (size_t k = 0; k < idx; k++) { 3720 mirror::Class* existing_interface = iftable->GetInterface(k); 3721 if (existing_interface == super_interface) { 3722 super_duplicate = true; 3723 break; 3724 } 3725 } 3726 if (!super_duplicate) { 3727 iftable->SetInterface(idx++, super_interface); 3728 } 3729 } 3730 } 3731 } 3732 // Shrink iftable in case duplicates were found 3733 if (idx < ifcount) { 3734 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3735 if (UNLIKELY(iftable.get() == NULL)) { 3736 CHECK(self->IsExceptionPending()); // OOME. 3737 return false; 3738 } 3739 ifcount = idx; 3740 } else { 3741 CHECK_EQ(idx, ifcount); 3742 } 3743 klass->SetIfTable(iftable.get()); 3744 3745 // If we're an interface, we don't need the vtable pointers, so we're done. 3746 if (klass->IsInterface()) { 3747 return true; 3748 } 3749 // Allocate imtable 3750 bool imtable_changed = false; 3751 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3752 if (UNLIKELY(imtable.get() == NULL)) { 3753 CHECK(self->IsExceptionPending()); // OOME. 3754 return false; 3755 } 3756 std::vector<mirror::ArtMethod*> miranda_list; 3757 for (size_t i = 0; i < ifcount; ++i) { 3758 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3759 if (num_methods > 0) { 3760 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3761 method_array(self, AllocArtMethodArray(self, num_methods)); 3762 if (UNLIKELY(method_array.get() == nullptr)) { 3763 CHECK(self->IsExceptionPending()); // OOME. 3764 return false; 3765 } 3766 iftable->SetMethodArray(i, method_array.get()); 3767 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3768 klass->GetVTableDuringLinking()); 3769 for (size_t j = 0; j < num_methods; ++j) { 3770 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3771 MethodHelper interface_mh(interface_method); 3772 int32_t k; 3773 // For each method listed in the interface's method list, find the 3774 // matching method in our class's method list. We want to favor the 3775 // subclass over the superclass, which just requires walking 3776 // back from the end of the vtable. (This only matters if the 3777 // superclass defines a private method and this class redefines 3778 // it -- otherwise it would use the same vtable slot. In .dex files 3779 // those don't end up in the virtual method table, so it shouldn't 3780 // matter which direction we go. We walk it backward anyway.) 3781 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3782 mirror::ArtMethod* vtable_method = vtable->Get(k); 3783 MethodHelper vtable_mh(vtable_method); 3784 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3785 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3786 ThrowIllegalAccessError(klass.get(), 3787 "Method '%s' implementing interface method '%s' is not public", 3788 PrettyMethod(vtable_method).c_str(), 3789 PrettyMethod(interface_method).c_str()); 3790 return false; 3791 } 3792 method_array->Set<false>(j, vtable_method); 3793 // Place method in imt if entry is empty, place conflict otherwise. 3794 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3795 if (imtable->Get(imt_index) == NULL) { 3796 imtable->Set<false>(imt_index, vtable_method); 3797 imtable_changed = true; 3798 } else { 3799 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3800 } 3801 break; 3802 } 3803 } 3804 if (k < 0) { 3805 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3806 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3807 mirror::ArtMethod* mir_method = miranda_list[mir]; 3808 MethodHelper vtable_mh(mir_method); 3809 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3810 miranda_method.reset(miranda_list[mir]); 3811 break; 3812 } 3813 } 3814 if (miranda_method.get() == NULL) { 3815 // Point the interface table at a phantom slot. 3816 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3817 if (UNLIKELY(miranda_method.get() == NULL)) { 3818 CHECK(self->IsExceptionPending()); // OOME. 3819 return false; 3820 } 3821 // TODO: If a methods move then the miranda_list may hold stale references. 3822 miranda_list.push_back(miranda_method.get()); 3823 } 3824 method_array->Set<false>(j, miranda_method.get()); 3825 } 3826 } 3827 } 3828 } 3829 if (imtable_changed) { 3830 // Fill in empty entries in interface method table with conflict. 3831 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3832 for (size_t i = 0; i < kImtSize; i++) { 3833 if (imtable->Get(i) == NULL) { 3834 imtable->Set<false>(i, imt_conflict_method); 3835 } 3836 } 3837 klass->SetImTable(imtable.get()); 3838 } 3839 if (!miranda_list.empty()) { 3840 int old_method_count = klass->NumVirtualMethods(); 3841 int new_method_count = old_method_count + miranda_list.size(); 3842 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3843 if (old_method_count == 0) { 3844 virtuals = AllocArtMethodArray(self, new_method_count); 3845 } else { 3846 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3847 } 3848 if (UNLIKELY(virtuals == NULL)) { 3849 CHECK(self->IsExceptionPending()); // OOME. 3850 return false; 3851 } 3852 klass->SetVirtualMethods(virtuals); 3853 3854 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3855 vtable(self, klass->GetVTableDuringLinking()); 3856 CHECK(vtable.get() != NULL); 3857 int old_vtable_count = vtable->GetLength(); 3858 int new_vtable_count = old_vtable_count + miranda_list.size(); 3859 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3860 if (UNLIKELY(vtable.get() == NULL)) { 3861 CHECK(self->IsExceptionPending()); // OOME. 3862 return false; 3863 } 3864 for (size_t i = 0; i < miranda_list.size(); ++i) { 3865 mirror::ArtMethod* method = miranda_list[i]; 3866 // Leave the declaring class alone as type indices are relative to it 3867 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3868 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3869 klass->SetVirtualMethod(old_method_count + i, method); 3870 vtable->Set<false>(old_vtable_count + i, method); 3871 } 3872 // TODO: do not assign to the vtable field until it is fully constructed. 3873 klass->SetVTable(vtable.get()); 3874 } 3875 3876 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3877 for (int i = 0; i < vtable->GetLength(); ++i) { 3878 CHECK(vtable->Get(i) != NULL); 3879 } 3880 3881// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3882 3883 return true; 3884} 3885 3886bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3887 CHECK(klass.get() != NULL); 3888 return LinkFields(klass, false); 3889} 3890 3891bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3892 CHECK(klass.get() != NULL); 3893 size_t allocated_class_size = klass->GetClassSize(); 3894 bool success = LinkFields(klass, true); 3895 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3896 return success; 3897} 3898 3899struct LinkFieldsComparator { 3900 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3901 } 3902 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3903 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3904 NO_THREAD_SAFETY_ANALYSIS { 3905 // First come reference fields, then 64-bit, and finally 32-bit 3906 FieldHelper fh1(field1); 3907 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3908 FieldHelper fh2(field2); 3909 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3910 if (type1 != type2) { 3911 bool is_primitive1 = type1 != Primitive::kPrimNot; 3912 bool is_primitive2 = type2 != Primitive::kPrimNot; 3913 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3914 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3915 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3916 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3917 if (order1 != order2) { 3918 return order1 < order2; 3919 } 3920 } 3921 // same basic group? then sort by string. 3922 const char* name1 = fh1.GetName(); 3923 const char* name2 = fh2.GetName(); 3924 return strcmp(name1, name2) < 0; 3925 } 3926}; 3927 3928bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3929 size_t num_fields = 3930 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3931 3932 mirror::ObjectArray<mirror::ArtField>* fields = 3933 is_static ? klass->GetSFields() : klass->GetIFields(); 3934 3935 // Initialize size and field_offset 3936 size_t size; 3937 MemberOffset field_offset(0); 3938 if (is_static) { 3939 size = klass->GetClassSize(); 3940 field_offset = mirror::Class::FieldsOffset(); 3941 } else { 3942 mirror::Class* super_class = klass->GetSuperClass(); 3943 if (super_class != NULL) { 3944 CHECK(super_class->IsResolved()); 3945 field_offset = MemberOffset(super_class->GetObjectSize()); 3946 } 3947 size = field_offset.Uint32Value(); 3948 } 3949 3950 CHECK_EQ(num_fields == 0, fields == NULL); 3951 3952 // we want a relatively stable order so that adding new fields 3953 // minimizes disruption of C++ version such as Class and Method. 3954 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3955 for (size_t i = 0; i < num_fields; i++) { 3956 mirror::ArtField* f = fields->Get(i); 3957 CHECK(f != NULL); 3958 grouped_and_sorted_fields.push_back(f); 3959 } 3960 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3961 LinkFieldsComparator()); 3962 3963 // References should be at the front. 3964 size_t current_field = 0; 3965 size_t num_reference_fields = 0; 3966 for (; current_field < num_fields; current_field++) { 3967 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3968 FieldHelper fh(field); 3969 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3970 bool isPrimitive = type != Primitive::kPrimNot; 3971 if (isPrimitive) { 3972 break; // past last reference, move on to the next phase 3973 } 3974 grouped_and_sorted_fields.pop_front(); 3975 num_reference_fields++; 3976 fields->Set<false>(current_field, field); 3977 field->SetOffset(field_offset); 3978 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3979 } 3980 3981 // Now we want to pack all of the double-wide fields together. If 3982 // we're not aligned, though, we want to shuffle one 32-bit field 3983 // into place. If we can't find one, we'll have to pad it. 3984 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3985 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3986 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3987 FieldHelper fh(field); 3988 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3989 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3990 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3991 continue; 3992 } 3993 fields->Set<false>(current_field++, field); 3994 field->SetOffset(field_offset); 3995 // drop the consumed field 3996 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3997 break; 3998 } 3999 // whether we found a 32-bit field for padding or not, we advance 4000 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4001 } 4002 4003 // Alignment is good, shuffle any double-wide fields forward, and 4004 // finish assigning field offsets to all fields. 4005 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4006 while (!grouped_and_sorted_fields.empty()) { 4007 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4008 grouped_and_sorted_fields.pop_front(); 4009 FieldHelper fh(field); 4010 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4011 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4012 fields->Set<false>(current_field, field); 4013 field->SetOffset(field_offset); 4014 field_offset = MemberOffset(field_offset.Uint32Value() + 4015 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4016 ? sizeof(uint64_t) 4017 : sizeof(uint32_t))); 4018 current_field++; 4019 } 4020 4021 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4022 if (!is_static && 4023 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4024 // We know there are no non-reference fields in the Reference classes, and we know 4025 // that 'referent' is alphabetically last, so this is easy... 4026 CHECK_EQ(num_reference_fields, num_fields); 4027 FieldHelper fh(fields->Get(num_fields - 1)); 4028 CHECK_STREQ(fh.GetName(), "referent"); 4029 --num_reference_fields; 4030 } 4031 4032 if (kIsDebugBuild) { 4033 // Make sure that all reference fields appear before 4034 // non-reference fields, and all double-wide fields are aligned. 4035 bool seen_non_ref = false; 4036 for (size_t i = 0; i < num_fields; i++) { 4037 mirror::ArtField* field = fields->Get(i); 4038 if (false) { // enable to debug field layout 4039 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4040 << " class=" << PrettyClass(klass.get()) 4041 << " field=" << PrettyField(field) 4042 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 4043 false); 4044 } 4045 FieldHelper fh(field); 4046 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4047 bool is_primitive = type != Primitive::kPrimNot; 4048 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4049 && (strcmp("referent", fh.GetName()) == 0)) { 4050 is_primitive = true; // We lied above, so we have to expect a lie here. 4051 } 4052 if (is_primitive) { 4053 if (!seen_non_ref) { 4054 seen_non_ref = true; 4055 DCHECK_EQ(num_reference_fields, i); 4056 } 4057 } else { 4058 DCHECK(!seen_non_ref); 4059 } 4060 } 4061 if (!seen_non_ref) { 4062 DCHECK_EQ(num_fields, num_reference_fields); 4063 } 4064 } 4065 size = field_offset.Uint32Value(); 4066 // Update klass 4067 if (is_static) { 4068 klass->SetNumReferenceStaticFields(num_reference_fields); 4069 klass->SetClassSize(size); 4070 } else { 4071 klass->SetNumReferenceInstanceFields(num_reference_fields); 4072 if (!klass->IsVariableSize()) { 4073 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4074 size_t previous_size = klass->GetObjectSize(); 4075 if (previous_size != 0) { 4076 // Make sure that we didn't originally have an incorrect size. 4077 CHECK_EQ(previous_size, size); 4078 } 4079 klass->SetObjectSize(size); 4080 } 4081 } 4082 return true; 4083} 4084 4085// Set the bitmap of reference offsets, refOffsets, from the ifields 4086// list. 4087void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4088 uint32_t reference_offsets = 0; 4089 mirror::Class* super_class = klass->GetSuperClass(); 4090 if (super_class != NULL) { 4091 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4092 // If our superclass overflowed, we don't stand a chance. 4093 if (reference_offsets == CLASS_WALK_SUPER) { 4094 klass->SetReferenceInstanceOffsets(reference_offsets); 4095 return; 4096 } 4097 } 4098 CreateReferenceOffsets(klass, false, reference_offsets); 4099} 4100 4101void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4102 CreateReferenceOffsets(klass, true, 0); 4103} 4104 4105void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4106 uint32_t reference_offsets) { 4107 size_t num_reference_fields = 4108 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4109 : klass->NumReferenceInstanceFieldsDuringLinking(); 4110 mirror::ObjectArray<mirror::ArtField>* fields = 4111 is_static ? klass->GetSFields() : klass->GetIFields(); 4112 // All of the fields that contain object references are guaranteed 4113 // to be at the beginning of the fields list. 4114 for (size_t i = 0; i < num_reference_fields; ++i) { 4115 // Note that byte_offset is the offset from the beginning of 4116 // object, not the offset into instance data 4117 mirror::ArtField* field = fields->Get(i); 4118 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4119 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4120 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4121 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4122 CHECK_NE(new_bit, 0U); 4123 reference_offsets |= new_bit; 4124 } else { 4125 reference_offsets = CLASS_WALK_SUPER; 4126 break; 4127 } 4128 } 4129 // Update fields in klass 4130 if (is_static) { 4131 klass->SetReferenceStaticOffsets(reference_offsets); 4132 } else { 4133 klass->SetReferenceInstanceOffsets(reference_offsets); 4134 } 4135} 4136 4137mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4138 const SirtRef<mirror::DexCache>& dex_cache) { 4139 DCHECK(dex_cache.get() != nullptr); 4140 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4141 if (resolved != NULL) { 4142 return resolved; 4143 } 4144 uint32_t utf16_length; 4145 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4146 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4147 dex_cache->SetResolvedString(string_idx, string); 4148 return string; 4149} 4150 4151mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4152 mirror::Class* referrer) { 4153 Thread* self = Thread::Current(); 4154 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4155 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4156 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4157} 4158 4159mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4160 const SirtRef<mirror::DexCache>& dex_cache, 4161 const SirtRef<mirror::ClassLoader>& class_loader) { 4162 DCHECK(dex_cache.get() != NULL); 4163 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4164 if (resolved == NULL) { 4165 Thread* self = Thread::Current(); 4166 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4167 resolved = FindClass(self, descriptor, class_loader); 4168 if (resolved != NULL) { 4169 // TODO: we used to throw here if resolved's class loader was not the 4170 // boot class loader. This was to permit different classes with the 4171 // same name to be loaded simultaneously by different loaders 4172 dex_cache->SetResolvedType(type_idx, resolved); 4173 } else { 4174 CHECK(self->IsExceptionPending()) 4175 << "Expected pending exception for failed resolution of: " << descriptor; 4176 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4177 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4178 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4179 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4180 self->ClearException(); 4181 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4182 self->GetException(NULL)->SetCause(cause.get()); 4183 } 4184 } 4185 } 4186 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4187 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4188 return resolved; 4189} 4190 4191mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4192 uint32_t method_idx, 4193 const SirtRef<mirror::DexCache>& dex_cache, 4194 const SirtRef<mirror::ClassLoader>& class_loader, 4195 mirror::ArtMethod* referrer, 4196 InvokeType type) { 4197 DCHECK(dex_cache.get() != NULL); 4198 // Check for hit in the dex cache. 4199 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4200 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4201 return resolved; 4202 } 4203 // Fail, get the declaring class. 4204 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4205 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4206 if (klass == NULL) { 4207 DCHECK(Thread::Current()->IsExceptionPending()); 4208 return NULL; 4209 } 4210 // Scan using method_idx, this saves string compares but will only hit for matching dex 4211 // caches/files. 4212 switch (type) { 4213 case kDirect: // Fall-through. 4214 case kStatic: 4215 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4216 break; 4217 case kInterface: 4218 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4219 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4220 break; 4221 case kSuper: // Fall-through. 4222 case kVirtual: 4223 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4224 break; 4225 default: 4226 LOG(FATAL) << "Unreachable - invocation type: " << type; 4227 } 4228 if (resolved == NULL) { 4229 // Search by name, which works across dex files. 4230 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4231 const Signature signature = dex_file.GetMethodSignature(method_id); 4232 switch (type) { 4233 case kDirect: // Fall-through. 4234 case kStatic: 4235 resolved = klass->FindDirectMethod(name, signature); 4236 break; 4237 case kInterface: 4238 resolved = klass->FindInterfaceMethod(name, signature); 4239 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4240 break; 4241 case kSuper: // Fall-through. 4242 case kVirtual: 4243 resolved = klass->FindVirtualMethod(name, signature); 4244 break; 4245 } 4246 } 4247 if (resolved != NULL) { 4248 // We found a method, check for incompatible class changes. 4249 if (resolved->CheckIncompatibleClassChange(type)) { 4250 resolved = NULL; 4251 } 4252 } 4253 if (resolved != NULL) { 4254 // Be a good citizen and update the dex cache to speed subsequent calls. 4255 dex_cache->SetResolvedMethod(method_idx, resolved); 4256 return resolved; 4257 } else { 4258 // We failed to find the method which means either an access error, an incompatible class 4259 // change, or no such method. First try to find the method among direct and virtual methods. 4260 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4261 const Signature signature = dex_file.GetMethodSignature(method_id); 4262 switch (type) { 4263 case kDirect: 4264 case kStatic: 4265 resolved = klass->FindVirtualMethod(name, signature); 4266 break; 4267 case kInterface: 4268 case kVirtual: 4269 case kSuper: 4270 resolved = klass->FindDirectMethod(name, signature); 4271 break; 4272 } 4273 4274 // If we found something, check that it can be accessed by the referrer. 4275 if (resolved != NULL && referrer != NULL) { 4276 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4277 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4278 if (!referring_class->CanAccess(methods_class)) { 4279 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4280 resolved, type); 4281 return NULL; 4282 } else if (!referring_class->CanAccessMember(methods_class, 4283 resolved->GetAccessFlags())) { 4284 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4285 return NULL; 4286 } 4287 } 4288 4289 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4290 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4291 switch (type) { 4292 case kDirect: 4293 case kStatic: 4294 if (resolved != NULL) { 4295 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4296 } else { 4297 resolved = klass->FindInterfaceMethod(name, signature); 4298 if (resolved != NULL) { 4299 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4300 } else { 4301 ThrowNoSuchMethodError(type, klass, name, signature); 4302 } 4303 } 4304 break; 4305 case kInterface: 4306 if (resolved != NULL) { 4307 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4308 } else { 4309 resolved = klass->FindVirtualMethod(name, signature); 4310 if (resolved != NULL) { 4311 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4312 } else { 4313 ThrowNoSuchMethodError(type, klass, name, signature); 4314 } 4315 } 4316 break; 4317 case kSuper: 4318 ThrowNoSuchMethodError(type, klass, name, signature); 4319 break; 4320 case kVirtual: 4321 if (resolved != NULL) { 4322 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4323 } else { 4324 resolved = klass->FindInterfaceMethod(name, signature); 4325 if (resolved != NULL) { 4326 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4327 } else { 4328 ThrowNoSuchMethodError(type, klass, name, signature); 4329 } 4330 } 4331 break; 4332 } 4333 DCHECK(Thread::Current()->IsExceptionPending()); 4334 return NULL; 4335 } 4336} 4337 4338mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4339 const SirtRef<mirror::DexCache>& dex_cache, 4340 const SirtRef<mirror::ClassLoader>& class_loader, 4341 bool is_static) { 4342 DCHECK(dex_cache.get() != nullptr); 4343 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4344 if (resolved != NULL) { 4345 return resolved; 4346 } 4347 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4348 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4349 if (klass == NULL) { 4350 DCHECK(Thread::Current()->IsExceptionPending()); 4351 return NULL; 4352 } 4353 4354 if (is_static) { 4355 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4356 } else { 4357 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4358 } 4359 4360 if (resolved == NULL) { 4361 const char* name = dex_file.GetFieldName(field_id); 4362 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4363 if (is_static) { 4364 resolved = klass->FindStaticField(name, type); 4365 } else { 4366 resolved = klass->FindInstanceField(name, type); 4367 } 4368 if (resolved == NULL) { 4369 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4370 return NULL; 4371 } 4372 } 4373 dex_cache->SetResolvedField(field_idx, resolved); 4374 return resolved; 4375} 4376 4377mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4378 uint32_t field_idx, 4379 const SirtRef<mirror::DexCache>& dex_cache, 4380 const SirtRef<mirror::ClassLoader>& class_loader) { 4381 DCHECK(dex_cache.get() != nullptr); 4382 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4383 if (resolved != NULL) { 4384 return resolved; 4385 } 4386 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4387 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4388 if (klass == NULL) { 4389 DCHECK(Thread::Current()->IsExceptionPending()); 4390 return NULL; 4391 } 4392 4393 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4394 StringPiece type(dex_file.StringDataByIdx( 4395 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4396 resolved = klass->FindField(name, type); 4397 if (resolved != NULL) { 4398 dex_cache->SetResolvedField(field_idx, resolved); 4399 } else { 4400 ThrowNoSuchFieldError("", klass, type, name); 4401 } 4402 return resolved; 4403} 4404 4405const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4406 uint32_t* length) { 4407 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4408 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4409 const DexFile& dex_file = *dex_cache->GetDexFile(); 4410 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4411 return dex_file.GetMethodShorty(method_id, length); 4412} 4413 4414void ClassLinker::DumpAllClasses(int flags) { 4415 if (dex_cache_image_class_lookup_required_) { 4416 MoveImageClassesToClassTable(); 4417 } 4418 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4419 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4420 std::vector<mirror::Class*> all_classes; 4421 { 4422 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4423 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4424 all_classes.push_back(it.second); 4425 } 4426 } 4427 4428 for (size_t i = 0; i < all_classes.size(); ++i) { 4429 all_classes[i]->DumpClass(std::cerr, flags); 4430 } 4431} 4432 4433void ClassLinker::DumpForSigQuit(std::ostream& os) { 4434 if (dex_cache_image_class_lookup_required_) { 4435 MoveImageClassesToClassTable(); 4436 } 4437 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4438 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4439} 4440 4441size_t ClassLinker::NumLoadedClasses() { 4442 if (dex_cache_image_class_lookup_required_) { 4443 MoveImageClassesToClassTable(); 4444 } 4445 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4446 return class_table_.size(); 4447} 4448 4449pid_t ClassLinker::GetClassesLockOwner() { 4450 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4451} 4452 4453pid_t ClassLinker::GetDexLockOwner() { 4454 return dex_lock_.GetExclusiveOwnerTid(); 4455} 4456 4457void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4458 DCHECK(!init_done_); 4459 4460 DCHECK(klass != NULL); 4461 DCHECK(klass->GetClassLoader() == NULL); 4462 4463 DCHECK(class_roots_ != NULL); 4464 DCHECK(class_roots_->Get(class_root) == NULL); 4465 class_roots_->Set<false>(class_root, klass); 4466} 4467 4468} // namespace art 4469