class_linker.cc revision 329d18806792771dfee064203fe27875d79cd53a
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': %s", filename, strerror(errno)); 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::vector<std::string>* error_msgs) { 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 std::string error_msg; 752 if (!scoped_flock.Init(oat_location, &error_msg)) { 753 error_msgs->push_back(error_msg); 754 return nullptr; 755 } 756 757 // Check if we already have an up-to-date output file 758 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 759 oat_location, &error_msg); 760 if (dex_file != nullptr) { 761 return dex_file; 762 } 763 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 764 dex_location, oat_location, error_msg.c_str()); 765 VLOG(class_linker) << compound_msg; 766 error_msgs->push_back(compound_msg); 767 768 // Generate the output oat file for the dex file 769 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 770 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) { 771 CHECK(!error_msg.empty()); 772 error_msgs->push_back(error_msg); 773 return nullptr; 774 } 775 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 776 !Runtime::Current()->IsCompiler(), 777 &error_msg); 778 if (oat_file == nullptr) { 779 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 780 oat_location, error_msg.c_str()); 781 error_msgs->push_back(compound_msg); 782 return nullptr; 783 } 784 oat_file = RegisterOatFile(oat_file); 785 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 786 &dex_location_checksum); 787 if (oat_dex_file == nullptr) { 788 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 789 "'%s'", dex_location, dex_location_checksum, oat_location); 790 error_msgs->push_back(error_msg); 791 return nullptr; 792 } 793 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 794 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 795 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 796 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 797 << " dex_location_checksum=" << dex_location_checksum 798 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 799 return result; 800} 801 802bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 803 const char* dex_location, 804 uint32_t dex_location_checksum, 805 std::string* error_msg) { 806 Runtime* runtime = Runtime::Current(); 807 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 808 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 809 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 810 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 811 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 812 813 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 814 if (oat_dex_file == NULL) { 815 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 816 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 817 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 818 for (size_t i = 0; i < oat_dex_files.size(); i++) { 819 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 820 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 821 oat_file->GetLocation().c_str(), 822 oat_dex_file->GetDexFileLocation().c_str()); 823 } 824 return false; 825 } 826 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 827 828 if (image_check && dex_check) { 829 return true; 830 } 831 832 if (!image_check) { 833 ScopedObjectAccess soa(Thread::Current()); 834 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 835 oat_file->GetLocation().c_str(), 836 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 837 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 838 image_oat_checksum, image_oat_data_begin); 839 } 840 if (!dex_check) { 841 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 842 oat_file->GetLocation().c_str(), 843 oat_dex_file->GetDexFileLocationChecksum(), 844 dex_location, dex_location_checksum); 845 } 846 return false; 847} 848 849const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 850 const char* dex_location, 851 std::string* error_msg, 852 bool* open_failed) { 853 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 854 if (oat_file.get() == nullptr) { 855 *open_failed = true; 856 return nullptr; 857 } 858 *open_failed = false; 859 uint32_t dex_location_checksum; 860 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 861 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 862 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 863 // directory. 864 const OatFile* opened_oat_file = oat_file.release(); 865 opened_oat_file = RegisterOatFile(opened_oat_file); 866 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 867 if (oat_dex_file == nullptr) { 868 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 869 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 870 error_msg->c_str()); 871 return nullptr; 872 } 873 return oat_dex_file->OpenDexFile(error_msg); 874 } 875 876 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 877 error_msg); 878 if (!verified) { 879 return nullptr; 880 } 881 const OatFile* opened_oat_file = oat_file.release(); 882 opened_oat_file = RegisterOatFile(opened_oat_file); 883 return opened_oat_file->GetOatDexFile(dex_location, 884 &dex_location_checksum)->OpenDexFile(error_msg); 885} 886 887const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 888 const uint32_t* const dex_location_checksum, 889 std::vector<std::string>* error_msgs) { 890 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 891 dex_location_checksum); 892 if (open_oat_file != nullptr) { 893 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 894 dex_location_checksum); 895 std::string error_msg; 896 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 897 if (ret == nullptr) { 898 error_msgs->push_back(error_msg); 899 } 900 return ret; 901 } 902 903 // Look for an existing file next to dex. for example, for 904 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 905 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 906 bool open_failed; 907 std::string error_msg; 908 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 909 &error_msg, &open_failed); 910 if (dex_file != nullptr) { 911 return dex_file; 912 } 913 if (dex_location_checksum == nullptr) { 914 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 915 "%s: %s", odex_filename.c_str(), dex_location, 916 error_msg.c_str())); 917 return nullptr; 918 } 919 920 std::string cache_error_msg; 921 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 922 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 923 &open_failed); 924 if (dex_file != nullptr) { 925 return dex_file; 926 } 927 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 928 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 929 } 930 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 931 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 932 cache_location.c_str(), cache_error_msg.c_str()); 933 VLOG(class_linker) << compound_msg; 934 error_msgs->push_back(compound_msg); 935 936 // Try to generate oat file if it wasn't found or was obsolete. 937 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 938 cache_location.c_str(), error_msgs); 939} 940 941const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 942 ReaderMutexLock mu(Thread::Current(), dex_lock_); 943 for (size_t i = 0; i < oat_files_.size(); i++) { 944 const OatFile* oat_file = oat_files_[i]; 945 DCHECK(oat_file != nullptr); 946 if (oat_file->GetLocation() == oat_location) { 947 return oat_file; 948 } 949 } 950 return nullptr; 951} 952 953const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 954 std::string* error_msg) { 955 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 956 if (oat_file != nullptr) { 957 return oat_file; 958 } 959 960 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 961 error_msg); 962 if (oat_file == NULL) { 963 return NULL; 964 } 965 return oat_file; 966} 967 968static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 969 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 970 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 971 972 DCHECK(obj != NULL); 973 DCHECK(class_linker != NULL); 974 975 if (obj->IsArtMethod()) { 976 mirror::ArtMethod* method = obj->AsArtMethod(); 977 if (!method->IsNative()) { 978 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 979 if (method != Runtime::Current()->GetResolutionMethod()) { 980 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 981 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 982 } 983 } 984 } 985} 986 987void ClassLinker::InitFromImage() { 988 VLOG(startup) << "ClassLinker::InitFromImage entering"; 989 CHECK(!init_done_); 990 991 Thread* self = Thread::Current(); 992 gc::Heap* heap = Runtime::Current()->GetHeap(); 993 gc::space::ImageSpace* space = heap->GetImageSpace(); 994 dex_cache_image_class_lookup_required_ = true; 995 CHECK(space != NULL); 996 OatFile& oat_file = GetImageOatFile(space); 997 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 998 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 999 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1000 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1001 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1002 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1003 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1004 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1005 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1006 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1007 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1008 1009 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1010 self, 1011 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1012 class_roots_ = class_roots.get(); 1013 1014 // Special case of setting up the String class early so that we can test arbitrary objects 1015 // as being Strings or not 1016 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1017 1018 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1019 static_cast<uint32_t>(dex_caches->GetLength())); 1020 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1021 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1022 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1023 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1024 nullptr); 1025 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1026 std::string error_msg; 1027 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1028 if (dex_file == NULL) { 1029 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1030 << " from within oat file " << oat_file.GetLocation() 1031 << " error '" << error_msg << "'"; 1032 } 1033 1034 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1035 1036 AppendToBootClassPath(*dex_file, dex_cache); 1037 } 1038 1039 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1040 // bitmap walk. 1041 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1042 1043 // Set entry point to interpreter if in InterpretOnly mode. 1044 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1045 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1046 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1047 } 1048 1049 // reinit class_roots_ 1050 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1051 class_roots_ = class_roots.get(); 1052 1053 // reinit array_iftable_ from any array class instance, they should be == 1054 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1055 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1056 // String class root was set above 1057 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1058 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1059 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1060 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1061 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1062 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1063 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1064 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1065 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1066 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1067 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1068 1069 FinishInit(self); 1070 1071 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1072} 1073 1074// Keep in sync with InitCallback. Anything we visit, we need to 1075// reinit references to when reinitializing a ClassLinker from a 1076// mapped image. 1077void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1078 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1079 Thread* self = Thread::Current(); 1080 { 1081 ReaderMutexLock mu(self, dex_lock_); 1082 if ((flags & kVisitRootFlagAllRoots) != 0) { 1083 for (mirror::DexCache*& dex_cache : dex_caches_) { 1084 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1085 } 1086 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1087 for (size_t index : new_dex_cache_roots_) { 1088 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1089 } 1090 } 1091 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1092 new_dex_cache_roots_.clear(); 1093 } 1094 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1095 log_new_dex_caches_roots_ = true; 1096 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1097 log_new_dex_caches_roots_ = false; 1098 } 1099 } 1100 { 1101 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1102 if ((flags & kVisitRootFlagAllRoots) != 0) { 1103 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1104 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1105 } 1106 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1107 for (auto& pair : new_class_roots_) { 1108 mirror::Object* old_ref = pair.second; 1109 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1110 if (UNLIKELY(pair.second != old_ref)) { 1111 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1112 // corresponding object. This is slow, but luckily for us, this may only happen with a 1113 // concurrent moving GC. 1114 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1115 it != end && it->first == pair.first; ++it) { 1116 // If the class stored matches the old class, update it to the new value. 1117 if (old_ref == it->second) { 1118 it->second = pair.second; 1119 } 1120 } 1121 } 1122 } 1123 } 1124 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1125 new_class_roots_.clear(); 1126 } 1127 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1128 log_new_class_table_roots_ = true; 1129 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1130 log_new_class_table_roots_ = false; 1131 } 1132 // We deliberately ignore the class roots in the image since we 1133 // handle image roots by using the MS/CMS rescanning of dirty cards. 1134 } 1135 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1136 DCHECK(array_iftable_ != nullptr); 1137 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1138 if (find_array_class_cache_[i] != nullptr) { 1139 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1140 kRootVMInternal); 1141 } 1142 } 1143} 1144 1145void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1146 if (dex_cache_image_class_lookup_required_) { 1147 MoveImageClassesToClassTable(); 1148 } 1149 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1150 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1151 if (!visitor(it.second, arg)) { 1152 return; 1153 } 1154 } 1155} 1156 1157static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1158 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1159 classes->insert(c); 1160 return true; 1161} 1162 1163void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1164 std::set<mirror::Class*> classes; 1165 VisitClasses(GetClassesVisitor, &classes); 1166 for (mirror::Class* klass : classes) { 1167 if (!visitor(klass, arg)) { 1168 return; 1169 } 1170 } 1171} 1172 1173ClassLinker::~ClassLinker() { 1174 mirror::Class::ResetClass(); 1175 mirror::String::ResetClass(); 1176 mirror::ArtField::ResetClass(); 1177 mirror::ArtMethod::ResetClass(); 1178 mirror::BooleanArray::ResetArrayClass(); 1179 mirror::ByteArray::ResetArrayClass(); 1180 mirror::CharArray::ResetArrayClass(); 1181 mirror::DoubleArray::ResetArrayClass(); 1182 mirror::FloatArray::ResetArrayClass(); 1183 mirror::IntArray::ResetArrayClass(); 1184 mirror::LongArray::ResetArrayClass(); 1185 mirror::ShortArray::ResetArrayClass(); 1186 mirror::Throwable::ResetClass(); 1187 mirror::StackTraceElement::ResetClass(); 1188 STLDeleteElements(&boot_class_path_); 1189 STLDeleteElements(&oat_files_); 1190} 1191 1192mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1193 gc::Heap* heap = Runtime::Current()->GetHeap(); 1194 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1195 SirtRef<mirror::DexCache> dex_cache( 1196 self, down_cast<mirror::DexCache*>( 1197 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize(), 1198 VoidFunctor()))); 1199 if (dex_cache.get() == NULL) { 1200 return NULL; 1201 } 1202 SirtRef<mirror::String> 1203 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1204 if (location.get() == NULL) { 1205 return NULL; 1206 } 1207 SirtRef<mirror::ObjectArray<mirror::String> > 1208 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1209 if (strings.get() == NULL) { 1210 return NULL; 1211 } 1212 SirtRef<mirror::ObjectArray<mirror::Class> > 1213 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1214 if (types.get() == NULL) { 1215 return NULL; 1216 } 1217 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1218 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1219 if (methods.get() == NULL) { 1220 return NULL; 1221 } 1222 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1223 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1224 if (fields.get() == NULL) { 1225 return NULL; 1226 } 1227 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1228 fields.get()); 1229 return dex_cache.get(); 1230} 1231 1232// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1233// fence. 1234class InitializeClassVisitor { 1235 public: 1236 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1237 } 1238 1239 void operator()(mirror::Object* obj, size_t usable_size) const 1240 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1241 DCHECK_LE(class_size_, usable_size); 1242 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1243 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1244 // DCHECK(klass->IsClass()); 1245 klass->SetClassSize(class_size_); 1246 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1247 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1248 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1249 } 1250 1251 private: 1252 const uint32_t class_size_; 1253 1254 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1255}; 1256 1257mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1258 uint32_t class_size) { 1259 DCHECK_GE(class_size, sizeof(mirror::Class)); 1260 gc::Heap* heap = Runtime::Current()->GetHeap(); 1261 InitializeClassVisitor visitor(class_size); 1262 mirror::Object* k = 1263 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1264 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1265 if (UNLIKELY(k == nullptr)) { 1266 CHECK(self->IsExceptionPending()); // OOME. 1267 return nullptr; 1268 } 1269 return k->AsClass(); 1270} 1271 1272mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1273 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1274} 1275 1276mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1277 return down_cast<mirror::ArtField*>( 1278 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1279} 1280 1281mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1282 return down_cast<mirror::ArtMethod*>( 1283 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1284} 1285 1286mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1287 Thread* self, size_t length) { 1288 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1289 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1290} 1291 1292static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1293 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1294 DCHECK(klass != NULL); 1295 // Wait for the class if it has not already been linked. 1296 if (!klass->IsResolved() && !klass->IsErroneous()) { 1297 SirtRef<mirror::Class> sirt_class(self, klass); 1298 ObjectLock<mirror::Class> lock(self, &sirt_class); 1299 // Check for circular dependencies between classes. 1300 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1301 ThrowClassCircularityError(sirt_class.get()); 1302 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1303 return nullptr; 1304 } 1305 // Wait for the pending initialization to complete. 1306 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1307 lock.WaitIgnoringInterrupts(); 1308 } 1309 klass = sirt_class.get(); 1310 } 1311 if (klass->IsErroneous()) { 1312 ThrowEarlierClassFailure(klass); 1313 return nullptr; 1314 } 1315 // Return the loaded class. No exceptions should be pending. 1316 CHECK(klass->IsResolved()) << PrettyClass(klass); 1317 self->AssertNoPendingException(); 1318 return klass; 1319} 1320 1321mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1322 const SirtRef<mirror::ClassLoader>& class_loader) { 1323 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1324 DCHECK(self != nullptr); 1325 self->AssertNoPendingException(); 1326 if (descriptor[1] == '\0') { 1327 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1328 // for primitive classes that aren't backed by dex files. 1329 return FindPrimitiveClass(descriptor[0]); 1330 } 1331 // Find the class in the loaded classes table. 1332 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1333 if (klass != NULL) { 1334 return EnsureResolved(self, klass); 1335 } 1336 // Class is not yet loaded. 1337 if (descriptor[0] == '[') { 1338 return CreateArrayClass(self, descriptor, class_loader); 1339 } else if (class_loader.get() == nullptr) { 1340 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1341 if (pair.second != NULL) { 1342 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1343 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1344 } 1345 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1346 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1347 // throw of a NoClassDefFoundError. 1348 if (IsInBootClassPath(descriptor)) { 1349 mirror::Class* system_class = FindSystemClass(self, descriptor); 1350 CHECK(system_class != NULL); 1351 return system_class; 1352 } 1353 // Next try the compile time class path. 1354 const std::vector<const DexFile*>* class_path; 1355 { 1356 ScopedObjectAccessUnchecked soa(self); 1357 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1358 soa.AddLocalReference<jobject>(class_loader.get())); 1359 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1360 } 1361 1362 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1363 if (pair.second != NULL) { 1364 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1365 } 1366 1367 } else { 1368 ScopedObjectAccessUnchecked soa(self); 1369 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1370 soa.AddLocalReference<jobject>(class_loader.get())); 1371 std::string class_name_string(DescriptorToDot(descriptor)); 1372 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1373 { 1374 ScopedThreadStateChange tsc(self, kNative); 1375 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1376 soa.Env()->NewStringUTF(class_name_string.c_str())); 1377 if (class_name_object.get() == NULL) { 1378 return NULL; 1379 } 1380 CHECK(class_loader_object.get() != NULL); 1381 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1382 WellKnownClasses::java_lang_ClassLoader_loadClass, 1383 class_name_object.get())); 1384 } 1385 if (self->IsExceptionPending()) { 1386 // If the ClassLoader threw, pass that exception up. 1387 return NULL; 1388 } else if (result.get() == NULL) { 1389 // broken loader - throw NPE to be compatible with Dalvik 1390 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1391 class_name_string.c_str()).c_str()); 1392 return NULL; 1393 } else { 1394 // success, return mirror::Class* 1395 return soa.Decode<mirror::Class*>(result.get()); 1396 } 1397 } 1398 1399 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1400 return NULL; 1401} 1402 1403mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1404 const SirtRef<mirror::ClassLoader>& class_loader, 1405 const DexFile& dex_file, 1406 const DexFile::ClassDef& dex_class_def) { 1407 Thread* self = Thread::Current(); 1408 SirtRef<mirror::Class> klass(self, NULL); 1409 // Load the class from the dex file. 1410 if (UNLIKELY(!init_done_)) { 1411 // finish up init of hand crafted class_roots_ 1412 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1413 klass.reset(GetClassRoot(kJavaLangObject)); 1414 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1415 klass.reset(GetClassRoot(kJavaLangClass)); 1416 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1417 klass.reset(GetClassRoot(kJavaLangString)); 1418 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1419 klass.reset(GetClassRoot(kJavaLangDexCache)); 1420 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1421 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1422 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1423 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1424 } else { 1425 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1426 } 1427 } else { 1428 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1429 } 1430 if (UNLIKELY(klass.get() == NULL)) { 1431 CHECK(self->IsExceptionPending()); // Expect an OOME. 1432 return NULL; 1433 } 1434 klass->SetDexCache(FindDexCache(dex_file)); 1435 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1436 // Check for a pending exception during load 1437 if (self->IsExceptionPending()) { 1438 klass->SetStatus(mirror::Class::kStatusError, self); 1439 return NULL; 1440 } 1441 ObjectLock<mirror::Class> lock(self, &klass); 1442 klass->SetClinitThreadId(self->GetTid()); 1443 // Add the newly loaded class to the loaded classes table. 1444 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1445 if (existing != NULL) { 1446 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1447 // this thread to block. 1448 return EnsureResolved(self, existing); 1449 } 1450 // Finish loading (if necessary) by finding parents 1451 CHECK(!klass->IsLoaded()); 1452 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1453 // Loading failed. 1454 klass->SetStatus(mirror::Class::kStatusError, self); 1455 return NULL; 1456 } 1457 CHECK(klass->IsLoaded()); 1458 // Link the class (if necessary) 1459 CHECK(!klass->IsResolved()); 1460 // TODO: Use fast jobjects? 1461 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1462 if (!LinkClass(self, klass, interfaces)) { 1463 // Linking failed. 1464 klass->SetStatus(mirror::Class::kStatusError, self); 1465 return NULL; 1466 } 1467 CHECK(klass->IsResolved()); 1468 1469 /* 1470 * We send CLASS_PREPARE events to the debugger from here. The 1471 * definition of "preparation" is creating the static fields for a 1472 * class and initializing them to the standard default values, but not 1473 * executing any code (that comes later, during "initialization"). 1474 * 1475 * We did the static preparation in LinkClass. 1476 * 1477 * The class has been prepared and resolved but possibly not yet verified 1478 * at this point. 1479 */ 1480 Dbg::PostClassPrepare(klass.get()); 1481 1482 return klass.get(); 1483} 1484 1485// Precomputes size that will be needed for Class, matching LinkStaticFields 1486uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1487 const DexFile::ClassDef& dex_class_def) { 1488 const byte* class_data = dex_file.GetClassData(dex_class_def); 1489 size_t num_ref = 0; 1490 size_t num_32 = 0; 1491 size_t num_64 = 0; 1492 if (class_data != NULL) { 1493 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1494 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1495 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1496 char c = descriptor[0]; 1497 if (c == 'L' || c == '[') { 1498 num_ref++; 1499 } else if (c == 'J' || c == 'D') { 1500 num_64++; 1501 } else { 1502 num_32++; 1503 } 1504 } 1505 } 1506 // start with generic class data 1507 uint32_t size = sizeof(mirror::Class); 1508 // follow with reference fields which must be contiguous at start 1509 size += (num_ref * sizeof(uint32_t)); 1510 // if there are 64-bit fields to add, make sure they are aligned 1511 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1512 if (num_32 != 0) { 1513 // use an available 32-bit field for padding 1514 num_32--; 1515 } 1516 size += sizeof(uint32_t); // either way, we are adding a word 1517 DCHECK_EQ(size, RoundUp(size, 8)); 1518 } 1519 // tack on any 64-bit fields now that alignment is assured 1520 size += (num_64 * sizeof(uint64_t)); 1521 // tack on any remaining 32-bit fields 1522 size += (num_32 * sizeof(uint32_t)); 1523 return size; 1524} 1525 1526const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1527 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1528 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1529 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1530 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1531 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1532 &dex_location_checksum); 1533 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1534 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1535 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1536 return oat_class; 1537} 1538 1539static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1540 uint32_t method_idx) { 1541 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1542 const byte* class_data = dex_file.GetClassData(class_def); 1543 CHECK(class_data != NULL); 1544 ClassDataItemIterator it(dex_file, class_data); 1545 // Skip fields 1546 while (it.HasNextStaticField()) { 1547 it.Next(); 1548 } 1549 while (it.HasNextInstanceField()) { 1550 it.Next(); 1551 } 1552 // Process methods 1553 size_t class_def_method_index = 0; 1554 while (it.HasNextDirectMethod()) { 1555 if (it.GetMemberIndex() == method_idx) { 1556 return class_def_method_index; 1557 } 1558 class_def_method_index++; 1559 it.Next(); 1560 } 1561 while (it.HasNextVirtualMethod()) { 1562 if (it.GetMemberIndex() == method_idx) { 1563 return class_def_method_index; 1564 } 1565 class_def_method_index++; 1566 it.Next(); 1567 } 1568 DCHECK(!it.HasNext()); 1569 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1570 return 0; 1571} 1572 1573const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1574 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1575 // method for direct methods (or virtual methods made direct). 1576 mirror::Class* declaring_class = method->GetDeclaringClass(); 1577 size_t oat_method_index; 1578 if (method->IsStatic() || method->IsDirect()) { 1579 // Simple case where the oat method index was stashed at load time. 1580 oat_method_index = method->GetMethodIndex(); 1581 } else { 1582 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1583 // by search for its position in the declared virtual methods. 1584 oat_method_index = declaring_class->NumDirectMethods(); 1585 size_t end = declaring_class->NumVirtualMethods(); 1586 bool found = false; 1587 for (size_t i = 0; i < end; i++) { 1588 if (declaring_class->GetVirtualMethod(i) == method) { 1589 found = true; 1590 break; 1591 } 1592 oat_method_index++; 1593 } 1594 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1595 } 1596 UniquePtr<const OatFile::OatClass> 1597 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1598 declaring_class->GetDexClassDefIndex())); 1599 CHECK(oat_class.get() != NULL); 1600 DCHECK_EQ(oat_method_index, 1601 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1602 method->GetDeclaringClass()->GetDexClassDefIndex(), 1603 method->GetDexMethodIndex())); 1604 1605 return oat_class->GetOatMethod(oat_method_index); 1606} 1607 1608// Special case to get oat code without overwriting a trampoline. 1609const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1610 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1611 if (method->IsProxyMethod()) { 1612 return GetQuickProxyInvokeHandler(); 1613 } 1614 const void* result = GetOatMethodFor(method).GetQuickCode(); 1615 if (result == nullptr) { 1616 if (method->IsNative()) { 1617 // No code and native? Use generic trampoline. 1618 result = GetQuickGenericJniTrampoline(); 1619 } else if (method->IsPortableCompiled()) { 1620 // No code? Do we expect portable code? 1621 result = GetQuickToPortableBridge(); 1622 } else { 1623 // No code? You must mean to go into the interpreter. 1624 result = GetQuickToInterpreterBridge(); 1625 } 1626 } 1627 return result; 1628} 1629 1630const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1631 bool* have_portable_code) { 1632 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1633 *have_portable_code = false; 1634 if (method->IsProxyMethod()) { 1635 return GetPortableProxyInvokeHandler(); 1636 } 1637 const void* result = GetOatMethodFor(method).GetPortableCode(); 1638 if (result == nullptr) { 1639 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1640 // No code? You must mean to go into the interpreter. 1641 result = GetPortableToInterpreterBridge(); 1642 } else { 1643 // No code? But there's quick code, so use a bridge. 1644 result = GetPortableToQuickBridge(); 1645 } 1646 } else { 1647 *have_portable_code = true; 1648 } 1649 return result; 1650} 1651 1652const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1653 uint32_t method_idx) { 1654 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1655 CHECK(oat_class.get() != nullptr); 1656 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1657 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1658} 1659 1660const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1661 uint32_t method_idx) { 1662 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1663 CHECK(oat_class.get() != nullptr); 1664 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1665 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1666} 1667 1668// Returns true if the method must run with interpreter, false otherwise. 1669static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1670 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1671 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1672 // No code: need interpreter. 1673 // May return true for native code, in the case of generic JNI 1674 // DCHECK(!method->IsNative()); 1675 return true; 1676 } 1677#ifdef ART_SEA_IR_MODE 1678 ScopedObjectAccess soa(Thread::Current()); 1679 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1680 LOG(INFO) << "Found " << PrettyMethod(method); 1681 return false; 1682 } 1683#endif 1684 // If interpreter mode is enabled, every method (except native and proxy) must 1685 // be run with interpreter. 1686 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1687 !method->IsNative() && !method->IsProxyMethod(); 1688} 1689 1690void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1691 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1692 if (klass->NumDirectMethods() == 0) { 1693 return; // No direct methods => no static methods. 1694 } 1695 Runtime* runtime = Runtime::Current(); 1696 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1697 return; // OAT file unavailable. 1698 } 1699 ClassHelper kh(klass); 1700 const DexFile& dex_file = kh.GetDexFile(); 1701 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1702 CHECK(dex_class_def != nullptr); 1703 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1704 // There should always be class data if there were direct methods. 1705 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1706 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1707 CHECK(oat_class.get() != nullptr); 1708 ClassDataItemIterator it(dex_file, class_data); 1709 // Skip fields 1710 while (it.HasNextStaticField()) { 1711 it.Next(); 1712 } 1713 while (it.HasNextInstanceField()) { 1714 it.Next(); 1715 } 1716 // Link the code of methods skipped by LinkCode. 1717 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1718 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1719 if (!method->IsStatic()) { 1720 // Only update static methods. 1721 continue; 1722 } 1723 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1724 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1725 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1726 bool have_portable_code = false; 1727 if (enter_interpreter) { 1728 // Use interpreter entry point. 1729 // Check whether the method is native, in which case it's generic JNI. 1730 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1731 quick_code = GetQuickGenericJniTrampoline(); 1732 portable_code = GetPortableToQuickBridge(); 1733 } else { 1734 portable_code = GetPortableToInterpreterBridge(); 1735 quick_code = GetQuickToInterpreterBridge(); 1736 } 1737 } else { 1738 if (portable_code == nullptr) { 1739 portable_code = GetPortableToQuickBridge(); 1740 } else { 1741 have_portable_code = true; 1742 } 1743 if (quick_code == nullptr) { 1744 quick_code = GetQuickToPortableBridge(); 1745 } 1746 } 1747 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1748 have_portable_code); 1749 } 1750 // Ignore virtual methods on the iterator. 1751} 1752 1753static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1754 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1755 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1756 // Method shouldn't have already been linked. 1757 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1758 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1759 // Every kind of method should at least get an invoke stub from the oat_method. 1760 // non-abstract methods also get their code pointers. 1761 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1762 oat_method.LinkMethod(method.get()); 1763 1764 // Install entry point from interpreter. 1765 Runtime* runtime = Runtime::Current(); 1766 bool enter_interpreter = NeedsInterpreter(method.get(), 1767 method->GetEntryPointFromQuickCompiledCode(), 1768 method->GetEntryPointFromPortableCompiledCode()); 1769 if (enter_interpreter && !method->IsNative()) { 1770 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1771 } else { 1772 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1773 } 1774 1775 if (method->IsAbstract()) { 1776 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1777 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1778 return; 1779 } 1780 1781 bool have_portable_code = false; 1782 if (method->IsStatic() && !method->IsConstructor()) { 1783 // For static methods excluding the class initializer, install the trampoline. 1784 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1785 // after initializing class (see ClassLinker::InitializeClass method). 1786 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1787 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1788 } else if (enter_interpreter) { 1789 if (!method->IsNative()) { 1790 // Set entry point from compiled code if there's no code or in interpreter only mode. 1791 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1792 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1793 } else { 1794 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1795 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1796 } 1797 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1798 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1799 have_portable_code = true; 1800 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1801 } else { 1802 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1803 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1804 } 1805 1806 if (method->IsNative()) { 1807 // Unregistering restores the dlsym lookup stub. 1808 method->UnregisterNative(Thread::Current()); 1809 1810 if (enter_interpreter) { 1811 // We have a native method here without code. Then it should have either the GenericJni 1812 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1813 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1814 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1815 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1816 1817 DCHECK_EQ(method->GetFrameSizeInBytes<false>(), 0U); 1818 1819 // Fix up method metadata if necessary. 1820 uint32_t s_len; 1821 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_index), &s_len); 1822 uint32_t refs = 1; // Native method always has "this" or class. 1823 for (uint32_t i = 1; i < s_len; ++i) { 1824 if (shorty[i] == 'L') { 1825 refs++; 1826 } 1827 } 1828 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(refs); 1829 1830 // Get the generic spill masks and base frame size. 1831 mirror::ArtMethod* callee_save_method = 1832 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 1833 1834 method->SetFrameSizeInBytes(callee_save_method->GetFrameSizeInBytes() + sirt_size); 1835 method->SetCoreSpillMask(callee_save_method->GetCoreSpillMask()); 1836 method->SetFpSpillMask(callee_save_method->GetFpSpillMask()); 1837 } 1838 } 1839 1840 // Allow instrumentation its chance to hijack code. 1841 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1842 method->GetEntryPointFromQuickCompiledCode(), 1843 method->GetEntryPointFromPortableCompiledCode(), 1844 have_portable_code); 1845} 1846 1847void ClassLinker::LoadClass(const DexFile& dex_file, 1848 const DexFile::ClassDef& dex_class_def, 1849 const SirtRef<mirror::Class>& klass, 1850 mirror::ClassLoader* class_loader) { 1851 CHECK(klass.get() != NULL); 1852 CHECK(klass->GetDexCache() != NULL); 1853 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1854 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1855 CHECK(descriptor != NULL); 1856 1857 klass->SetClass(GetClassRoot(kJavaLangClass)); 1858 if (kUseBakerOrBrooksReadBarrier) { 1859 klass->AssertReadBarrierPointer(); 1860 } 1861 uint32_t access_flags = dex_class_def.access_flags_; 1862 // Make sure that none of our runtime-only flags are set. 1863 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1864 klass->SetAccessFlags(access_flags); 1865 klass->SetClassLoader(class_loader); 1866 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1867 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1868 1869 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1870 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1871 1872 // Load fields fields. 1873 const byte* class_data = dex_file.GetClassData(dex_class_def); 1874 if (class_data == NULL) { 1875 return; // no fields or methods - for example a marker interface 1876 } 1877 ClassDataItemIterator it(dex_file, class_data); 1878 Thread* self = Thread::Current(); 1879 if (it.NumStaticFields() != 0) { 1880 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1881 if (UNLIKELY(statics == NULL)) { 1882 CHECK(self->IsExceptionPending()); // OOME. 1883 return; 1884 } 1885 klass->SetSFields(statics); 1886 } 1887 if (it.NumInstanceFields() != 0) { 1888 mirror::ObjectArray<mirror::ArtField>* fields = 1889 AllocArtFieldArray(self, it.NumInstanceFields()); 1890 if (UNLIKELY(fields == NULL)) { 1891 CHECK(self->IsExceptionPending()); // OOME. 1892 return; 1893 } 1894 klass->SetIFields(fields); 1895 } 1896 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1897 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1898 if (UNLIKELY(sfield.get() == NULL)) { 1899 CHECK(self->IsExceptionPending()); // OOME. 1900 return; 1901 } 1902 klass->SetStaticField(i, sfield.get()); 1903 LoadField(dex_file, it, klass, sfield); 1904 } 1905 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1906 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1907 if (UNLIKELY(ifield.get() == NULL)) { 1908 CHECK(self->IsExceptionPending()); // OOME. 1909 return; 1910 } 1911 klass->SetInstanceField(i, ifield.get()); 1912 LoadField(dex_file, it, klass, ifield); 1913 } 1914 1915 UniquePtr<const OatFile::OatClass> oat_class; 1916 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1917 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1918 } 1919 1920 // Load methods. 1921 if (it.NumDirectMethods() != 0) { 1922 // TODO: append direct methods to class object 1923 mirror::ObjectArray<mirror::ArtMethod>* directs = 1924 AllocArtMethodArray(self, it.NumDirectMethods()); 1925 if (UNLIKELY(directs == NULL)) { 1926 CHECK(self->IsExceptionPending()); // OOME. 1927 return; 1928 } 1929 klass->SetDirectMethods(directs); 1930 } 1931 if (it.NumVirtualMethods() != 0) { 1932 // TODO: append direct methods to class object 1933 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1934 AllocArtMethodArray(self, it.NumVirtualMethods()); 1935 if (UNLIKELY(virtuals == NULL)) { 1936 CHECK(self->IsExceptionPending()); // OOME. 1937 return; 1938 } 1939 klass->SetVirtualMethods(virtuals); 1940 } 1941 size_t class_def_method_index = 0; 1942 for (size_t i = 0; it.HasNextDirectMethod(); 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->SetDirectMethod(i, method.get()); 1949 if (oat_class.get() != NULL) { 1950 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1951 } 1952 method->SetMethodIndex(class_def_method_index); 1953 class_def_method_index++; 1954 } 1955 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1956 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1957 if (UNLIKELY(method.get() == NULL)) { 1958 CHECK(self->IsExceptionPending()); // OOME. 1959 return; 1960 } 1961 klass->SetVirtualMethod(i, method.get()); 1962 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1963 if (oat_class.get() != NULL) { 1964 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1965 } 1966 class_def_method_index++; 1967 } 1968 DCHECK(!it.HasNext()); 1969} 1970 1971void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1972 const SirtRef<mirror::Class>& klass, 1973 const SirtRef<mirror::ArtField>& dst) { 1974 uint32_t field_idx = it.GetMemberIndex(); 1975 dst->SetDexFieldIndex(field_idx); 1976 dst->SetDeclaringClass(klass.get()); 1977 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1978} 1979 1980mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1981 const ClassDataItemIterator& it, 1982 const SirtRef<mirror::Class>& klass) { 1983 uint32_t dex_method_idx = it.GetMemberIndex(); 1984 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1985 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1986 1987 mirror::ArtMethod* dst = AllocArtMethod(self); 1988 if (UNLIKELY(dst == NULL)) { 1989 CHECK(self->IsExceptionPending()); // OOME. 1990 return NULL; 1991 } 1992 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1993 1994 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1995 dst->SetDexMethodIndex(dex_method_idx); 1996 dst->SetDeclaringClass(klass.get()); 1997 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1998 1999 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2000 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2001 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2002 2003 uint32_t access_flags = it.GetMemberAccessFlags(); 2004 2005 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2006 // Set finalizable flag on declaring class. 2007 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2008 // Void return type. 2009 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2010 klass->SetFinalizable(); 2011 } else { 2012 ClassHelper kh(klass.get()); 2013 const char* klass_descriptor = kh.GetDescriptor(); 2014 // The Enum class declares a "final" finalize() method to prevent subclasses from 2015 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2016 // subclasses, so we exclude it here. 2017 // We also want to avoid setting the flag on Object, where we know that finalize() is 2018 // empty. 2019 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2020 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2021 klass->SetFinalizable(); 2022 } 2023 } 2024 } 2025 } else if (method_name[0] == '<') { 2026 // Fix broken access flags for initializers. Bug 11157540. 2027 bool is_init = (strcmp("<init>", method_name) == 0); 2028 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2029 if (UNLIKELY(!is_init && !is_clinit)) { 2030 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2031 } else { 2032 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2033 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2034 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2035 access_flags |= kAccConstructor; 2036 } 2037 } 2038 } 2039 dst->SetAccessFlags(access_flags); 2040 2041 self->EndAssertNoThreadSuspension(old_cause); 2042 return dst; 2043} 2044 2045void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2046 Thread* self = Thread::Current(); 2047 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2048 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2049 AppendToBootClassPath(dex_file, dex_cache); 2050} 2051 2052void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2053 const SirtRef<mirror::DexCache>& dex_cache) { 2054 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2055 boot_class_path_.push_back(&dex_file); 2056 RegisterDexFile(dex_file, dex_cache); 2057} 2058 2059bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2060 dex_lock_.AssertSharedHeld(Thread::Current()); 2061 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2062 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2063 return true; 2064 } 2065 } 2066 return false; 2067} 2068 2069bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2070 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2071 return IsDexFileRegisteredLocked(dex_file); 2072} 2073 2074void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2075 const SirtRef<mirror::DexCache>& dex_cache) { 2076 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2077 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2078 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2079 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2080 dex_caches_.push_back(dex_cache.get()); 2081 dex_cache->SetDexFile(&dex_file); 2082 if (log_new_dex_caches_roots_) { 2083 // TODO: This is not safe if we can remove dex caches. 2084 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2085 } 2086} 2087 2088void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2089 Thread* self = Thread::Current(); 2090 { 2091 ReaderMutexLock mu(self, dex_lock_); 2092 if (IsDexFileRegisteredLocked(dex_file)) { 2093 return; 2094 } 2095 } 2096 // Don't alloc while holding the lock, since allocation may need to 2097 // suspend all threads and another thread may need the dex_lock_ to 2098 // get to a suspend point. 2099 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2100 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2101 { 2102 WriterMutexLock mu(self, dex_lock_); 2103 if (IsDexFileRegisteredLocked(dex_file)) { 2104 return; 2105 } 2106 RegisterDexFileLocked(dex_file, dex_cache); 2107 } 2108} 2109 2110void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2111 const SirtRef<mirror::DexCache>& dex_cache) { 2112 WriterMutexLock mu(Thread::Current(), dex_lock_); 2113 RegisterDexFileLocked(dex_file, dex_cache); 2114} 2115 2116mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2117 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2118 // Search assuming unique-ness of dex file. 2119 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2120 mirror::DexCache* dex_cache = dex_caches_[i]; 2121 if (dex_cache->GetDexFile() == &dex_file) { 2122 return dex_cache; 2123 } 2124 } 2125 // Search matching by location name. 2126 std::string location(dex_file.GetLocation()); 2127 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2128 mirror::DexCache* dex_cache = dex_caches_[i]; 2129 if (dex_cache->GetDexFile()->GetLocation() == location) { 2130 return dex_cache; 2131 } 2132 } 2133 // Failure, dump diagnostic and abort. 2134 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2135 mirror::DexCache* dex_cache = dex_caches_[i]; 2136 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2137 } 2138 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2139 return NULL; 2140} 2141 2142void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2143 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2144 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2145 dex_caches_[i]->Fixup(resolution_method); 2146 } 2147} 2148 2149mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2150 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2151 if (UNLIKELY(klass == NULL)) { 2152 return NULL; 2153 } 2154 return InitializePrimitiveClass(klass, type); 2155} 2156 2157mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2158 Primitive::Type type) { 2159 CHECK(primitive_class != NULL); 2160 // Must hold lock on object when initializing. 2161 Thread* self = Thread::Current(); 2162 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2163 ObjectLock<mirror::Class> lock(self, &sirt_class); 2164 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2165 primitive_class->SetPrimitiveType(type); 2166 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2167 const char* descriptor = Primitive::Descriptor(type); 2168 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2169 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2170 return primitive_class; 2171} 2172 2173// Create an array class (i.e. the class object for the array, not the 2174// array itself). "descriptor" looks like "[C" or "[[[[B" or 2175// "[Ljava/lang/String;". 2176// 2177// If "descriptor" refers to an array of primitives, look up the 2178// primitive type's internally-generated class object. 2179// 2180// "class_loader" is the class loader of the class that's referring to 2181// us. It's used to ensure that we're looking for the element type in 2182// the right context. It does NOT become the class loader for the 2183// array class; that always comes from the base element class. 2184// 2185// Returns NULL with an exception raised on failure. 2186mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2187 const SirtRef<mirror::ClassLoader>& class_loader) { 2188 // Identify the underlying component type 2189 CHECK_EQ('[', descriptor[0]); 2190 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2191 if (component_type.get() == nullptr) { 2192 DCHECK(self->IsExceptionPending()); 2193 return nullptr; 2194 } 2195 2196 // See if the component type is already loaded. Array classes are 2197 // always associated with the class loader of their underlying 2198 // element type -- an array of Strings goes with the loader for 2199 // java/lang/String -- so we need to look for it there. (The 2200 // caller should have checked for the existence of the class 2201 // before calling here, but they did so with *their* class loader, 2202 // not the component type's loader.) 2203 // 2204 // If we find it, the caller adds "loader" to the class' initiating 2205 // loader list, which should prevent us from going through this again. 2206 // 2207 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2208 // are the same, because our caller (FindClass) just did the 2209 // lookup. (Even if we get this wrong we still have correct behavior, 2210 // because we effectively do this lookup again when we add the new 2211 // class to the hash table --- necessary because of possible races with 2212 // other threads.) 2213 if (class_loader.get() != component_type->GetClassLoader()) { 2214 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2215 if (new_class != NULL) { 2216 return new_class; 2217 } 2218 } 2219 2220 // Fill out the fields in the Class. 2221 // 2222 // It is possible to execute some methods against arrays, because 2223 // all arrays are subclasses of java_lang_Object_, so we need to set 2224 // up a vtable. We can just point at the one in java_lang_Object_. 2225 // 2226 // Array classes are simple enough that we don't need to do a full 2227 // link step. 2228 SirtRef<mirror::Class> new_class(self, NULL); 2229 if (UNLIKELY(!init_done_)) { 2230 // Classes that were hand created, ie not by FindSystemClass 2231 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2232 new_class.reset(GetClassRoot(kClassArrayClass)); 2233 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2234 new_class.reset(GetClassRoot(kObjectArrayClass)); 2235 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2236 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2237 } else if (strcmp(descriptor, 2238 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2239 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2240 } else if (strcmp(descriptor, 2241 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2242 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2243 } else if (strcmp(descriptor, "[C") == 0) { 2244 new_class.reset(GetClassRoot(kCharArrayClass)); 2245 } else if (strcmp(descriptor, "[I") == 0) { 2246 new_class.reset(GetClassRoot(kIntArrayClass)); 2247 } 2248 } 2249 if (new_class.get() == nullptr) { 2250 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2251 if (new_class.get() == nullptr) { 2252 return nullptr; 2253 } 2254 new_class->SetComponentType(component_type.get()); 2255 } 2256 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2257 DCHECK(new_class->GetComponentType() != NULL); 2258 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2259 new_class->SetSuperClass(java_lang_Object); 2260 new_class->SetVTable(java_lang_Object->GetVTable()); 2261 new_class->SetPrimitiveType(Primitive::kPrimNot); 2262 new_class->SetClassLoader(component_type->GetClassLoader()); 2263 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2264 // don't need to set new_class->SetObjectSize(..) 2265 // because Object::SizeOf delegates to Array::SizeOf 2266 2267 2268 // All arrays have java/lang/Cloneable and java/io/Serializable as 2269 // interfaces. We need to set that up here, so that stuff like 2270 // "instanceof" works right. 2271 // 2272 // Note: The GC could run during the call to FindSystemClass, 2273 // so we need to make sure the class object is GC-valid while we're in 2274 // there. Do this by clearing the interface list so the GC will just 2275 // think that the entries are null. 2276 2277 2278 // Use the single, global copies of "interfaces" and "iftable" 2279 // (remember not to free them for arrays). 2280 CHECK(array_iftable_ != nullptr); 2281 new_class->SetIfTable(array_iftable_); 2282 2283 // Inherit access flags from the component type. 2284 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2285 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2286 access_flags &= kAccJavaFlagsMask; 2287 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2288 // and remove "interface". 2289 access_flags |= kAccAbstract | kAccFinal; 2290 access_flags &= ~kAccInterface; 2291 2292 new_class->SetAccessFlags(access_flags); 2293 2294 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2295 if (existing == nullptr) { 2296 return new_class.get(); 2297 } 2298 // Another thread must have loaded the class after we 2299 // started but before we finished. Abandon what we've 2300 // done. 2301 // 2302 // (Yes, this happens.) 2303 2304 return existing; 2305} 2306 2307mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2308 switch (type) { 2309 case 'B': 2310 return GetClassRoot(kPrimitiveByte); 2311 case 'C': 2312 return GetClassRoot(kPrimitiveChar); 2313 case 'D': 2314 return GetClassRoot(kPrimitiveDouble); 2315 case 'F': 2316 return GetClassRoot(kPrimitiveFloat); 2317 case 'I': 2318 return GetClassRoot(kPrimitiveInt); 2319 case 'J': 2320 return GetClassRoot(kPrimitiveLong); 2321 case 'S': 2322 return GetClassRoot(kPrimitiveShort); 2323 case 'Z': 2324 return GetClassRoot(kPrimitiveBoolean); 2325 case 'V': 2326 return GetClassRoot(kPrimitiveVoid); 2327 default: 2328 break; 2329 } 2330 std::string printable_type(PrintableChar(type)); 2331 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2332 return NULL; 2333} 2334 2335mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2336 size_t hash) { 2337 if (VLOG_IS_ON(class_linker)) { 2338 mirror::DexCache* dex_cache = klass->GetDexCache(); 2339 std::string source; 2340 if (dex_cache != NULL) { 2341 source += " from "; 2342 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2343 } 2344 LOG(INFO) << "Loaded class " << descriptor << source; 2345 } 2346 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2347 mirror::Class* existing = 2348 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2349 if (existing != NULL) { 2350 return existing; 2351 } 2352 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2353 // Check a class loaded with the system class loader matches one in the image if the class 2354 // is in the image. 2355 existing = LookupClassFromImage(descriptor); 2356 if (existing != NULL) { 2357 CHECK(klass == existing); 2358 } 2359 } 2360 VerifyObject(klass); 2361 class_table_.insert(std::make_pair(hash, klass)); 2362 if (log_new_class_table_roots_) { 2363 new_class_roots_.push_back(std::make_pair(hash, klass)); 2364 } 2365 return NULL; 2366} 2367 2368bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2369 size_t hash = Hash(descriptor); 2370 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2371 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2372 ++it) { 2373 mirror::Class* klass = it->second; 2374 ClassHelper kh(klass); 2375 if ((klass->GetClassLoader() == class_loader) && 2376 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2377 class_table_.erase(it); 2378 return true; 2379 } 2380 } 2381 return false; 2382} 2383 2384mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2385 const mirror::ClassLoader* class_loader) { 2386 size_t hash = Hash(descriptor); 2387 { 2388 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2389 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2390 if (result != NULL) { 2391 return result; 2392 } 2393 } 2394 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2395 return NULL; 2396 } else { 2397 // Lookup failed but need to search dex_caches_. 2398 mirror::Class* result = LookupClassFromImage(descriptor); 2399 if (result != NULL) { 2400 InsertClass(descriptor, result, hash); 2401 } else { 2402 // Searching the image dex files/caches failed, we don't want to get into this situation 2403 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2404 // classes into the class table. 2405 const int32_t kMaxFailedDexCacheLookups = 1000; 2406 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2407 MoveImageClassesToClassTable(); 2408 } 2409 } 2410 return result; 2411 } 2412} 2413 2414mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2415 const mirror::ClassLoader* class_loader, 2416 size_t hash) { 2417 auto end = class_table_.end(); 2418 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2419 mirror::Class* klass = it->second; 2420 ClassHelper kh(klass); 2421 if ((klass->GetClassLoader() == class_loader) && 2422 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2423 if (kIsDebugBuild) { 2424 // Check for duplicates in the table. 2425 for (++it; it != end && it->first == hash; ++it) { 2426 mirror::Class* klass2 = it->second; 2427 ClassHelper kh(klass2); 2428 CHECK(!((klass2->GetClassLoader() == class_loader) && 2429 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2430 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2431 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2432 } 2433 } 2434 return klass; 2435 } 2436 } 2437 return NULL; 2438} 2439 2440static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2441 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2442 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2443 CHECK(image != NULL); 2444 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2445 return root->AsObjectArray<mirror::DexCache>(); 2446} 2447 2448void ClassLinker::MoveImageClassesToClassTable() { 2449 Thread* self = Thread::Current(); 2450 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2451 if (!dex_cache_image_class_lookup_required_) { 2452 return; // All dex cache classes are already in the class table. 2453 } 2454 const char* old_no_suspend_cause = 2455 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2456 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2457 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2458 mirror::DexCache* dex_cache = dex_caches->Get(i); 2459 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2460 for (int32_t j = 0; j < types->GetLength(); j++) { 2461 mirror::Class* klass = types->Get(j); 2462 if (klass != NULL) { 2463 ClassHelper kh(klass); 2464 DCHECK(klass->GetClassLoader() == NULL); 2465 const char* descriptor = kh.GetDescriptor(); 2466 size_t hash = Hash(descriptor); 2467 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2468 if (existing != NULL) { 2469 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2470 << PrettyClassAndClassLoader(klass); 2471 } else { 2472 class_table_.insert(std::make_pair(hash, klass)); 2473 if (log_new_class_table_roots_) { 2474 new_class_roots_.push_back(std::make_pair(hash, klass)); 2475 } 2476 } 2477 } 2478 } 2479 } 2480 dex_cache_image_class_lookup_required_ = false; 2481 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2482} 2483 2484mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2485 Thread* self = Thread::Current(); 2486 const char* old_no_suspend_cause = 2487 self->StartAssertNoThreadSuspension("Image class lookup"); 2488 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2489 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2490 mirror::DexCache* dex_cache = dex_caches->Get(i); 2491 const DexFile* dex_file = dex_cache->GetDexFile(); 2492 // Try binary searching the string/type index. 2493 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2494 if (string_id != NULL) { 2495 const DexFile::TypeId* type_id = 2496 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2497 if (type_id != NULL) { 2498 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2499 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2500 if (klass != NULL) { 2501 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2502 return klass; 2503 } 2504 } 2505 } 2506 } 2507 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2508 return NULL; 2509} 2510 2511void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2512 result.clear(); 2513 if (dex_cache_image_class_lookup_required_) { 2514 MoveImageClassesToClassTable(); 2515 } 2516 size_t hash = Hash(descriptor); 2517 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2518 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2519 it != end && it->first == hash; ++it) { 2520 mirror::Class* klass = it->second; 2521 ClassHelper kh(klass); 2522 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2523 result.push_back(klass); 2524 } 2525 } 2526} 2527 2528void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2529 // TODO: assert that the monitor on the Class is held 2530 Thread* self = Thread::Current(); 2531 ObjectLock<mirror::Class> lock(self, &klass); 2532 2533 // Don't attempt to re-verify if already sufficiently verified. 2534 if (klass->IsVerified() || 2535 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2536 return; 2537 } 2538 2539 // The class might already be erroneous, for example at compile time if we attempted to verify 2540 // this class as a parent to another. 2541 if (klass->IsErroneous()) { 2542 ThrowEarlierClassFailure(klass.get()); 2543 return; 2544 } 2545 2546 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2547 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2548 } else { 2549 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2550 << PrettyClass(klass.get()); 2551 CHECK(!Runtime::Current()->IsCompiler()); 2552 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2553 } 2554 2555 // Skip verification if disabled. 2556 if (!Runtime::Current()->IsVerificationEnabled()) { 2557 klass->SetStatus(mirror::Class::kStatusVerified, self); 2558 return; 2559 } 2560 2561 // Verify super class. 2562 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2563 if (super.get() != NULL) { 2564 // Acquire lock to prevent races on verifying the super class. 2565 ObjectLock<mirror::Class> lock(self, &super); 2566 2567 if (!super->IsVerified() && !super->IsErroneous()) { 2568 VerifyClass(super); 2569 } 2570 if (!super->IsCompileTimeVerified()) { 2571 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2572 PrettyDescriptor(klass.get()).c_str(), 2573 PrettyDescriptor(super.get()).c_str())); 2574 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2575 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2576 if (cause.get() != nullptr) { 2577 self->ClearException(); 2578 } 2579 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2580 if (cause.get() != nullptr) { 2581 self->GetException(nullptr)->SetCause(cause.get()); 2582 } 2583 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2584 if (Runtime::Current()->IsCompiler()) { 2585 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2586 } 2587 klass->SetStatus(mirror::Class::kStatusError, self); 2588 return; 2589 } 2590 } 2591 2592 // Try to use verification information from the oat file, otherwise do runtime verification. 2593 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2594 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2595 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2596 if (oat_file_class_status == mirror::Class::kStatusError) { 2597 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2598 << PrettyDescriptor(klass.get()) << " in " 2599 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2600 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2601 PrettyDescriptor(klass.get()).c_str()); 2602 klass->SetStatus(mirror::Class::kStatusError, self); 2603 return; 2604 } 2605 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2606 std::string error_msg; 2607 if (!preverified) { 2608 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2609 Runtime::Current()->IsCompiler(), 2610 &error_msg); 2611 } 2612 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2613 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2614 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2615 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2616 << " because: " << error_msg; 2617 } 2618 self->AssertNoPendingException(); 2619 // Make sure all classes referenced by catch blocks are resolved. 2620 ResolveClassExceptionHandlerTypes(dex_file, klass); 2621 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2622 // Even though there were no verifier failures we need to respect whether the super-class 2623 // was verified or requiring runtime reverification. 2624 if (super.get() == NULL || super->IsVerified()) { 2625 klass->SetStatus(mirror::Class::kStatusVerified, self); 2626 } else { 2627 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2628 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2629 // Pretend a soft failure occured so that we don't consider the class verified below. 2630 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2631 } 2632 } else { 2633 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2634 // Soft failures at compile time should be retried at runtime. Soft 2635 // failures at runtime will be handled by slow paths in the generated 2636 // code. Set status accordingly. 2637 if (Runtime::Current()->IsCompiler()) { 2638 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2639 } else { 2640 klass->SetStatus(mirror::Class::kStatusVerified, self); 2641 } 2642 } 2643 } else { 2644 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2645 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2646 << " because: " << error_msg; 2647 self->AssertNoPendingException(); 2648 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2649 klass->SetStatus(mirror::Class::kStatusError, self); 2650 } 2651 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2652 // Class is verified so we don't need to do any access check on its methods. 2653 // Let the interpreter know it by setting the kAccPreverified flag onto each 2654 // method. 2655 // Note: we're going here during compilation and at runtime. When we set the 2656 // kAccPreverified flag when compiling image classes, the flag is recorded 2657 // in the image and is set when loading the image. 2658 klass->SetPreverifiedFlagOnAllMethods(); 2659 } 2660} 2661 2662bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2663 mirror::Class::Status& oat_file_class_status) { 2664 // If we're compiling, we can only verify the class using the oat file if 2665 // we are not compiling the image or if the class we're verifying is not part of 2666 // the app. In other words, we will only check for preverification of bootclasspath 2667 // classes. 2668 if (Runtime::Current()->IsCompiler()) { 2669 // Are we compiling the bootclasspath? 2670 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2671 return false; 2672 } 2673 // We are compiling an app (not the image). 2674 2675 // Is this an app class? (I.e. not a bootclasspath class) 2676 if (klass->GetClassLoader() != NULL) { 2677 return false; 2678 } 2679 } 2680 2681 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2682 // Make this work with gtests, which do not set up the image properly. 2683 // TODO: we should clean up gtests to set up the image path properly. 2684 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2685 return false; 2686 } 2687 2688 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2689 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2690 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2691 &dex_location_checksum); 2692 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2693 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2694 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2695 CHECK(oat_class.get() != NULL) 2696 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2697 << ClassHelper(klass).GetDescriptor(); 2698 oat_file_class_status = oat_class->GetStatus(); 2699 if (oat_file_class_status == mirror::Class::kStatusVerified || 2700 oat_file_class_status == mirror::Class::kStatusInitialized) { 2701 return true; 2702 } 2703 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2704 // Compile time verification failed with a soft error. Compile time verification can fail 2705 // because we have incomplete type information. Consider the following: 2706 // class ... { 2707 // Foo x; 2708 // .... () { 2709 // if (...) { 2710 // v1 gets assigned a type of resolved class Foo 2711 // } else { 2712 // v1 gets assigned a type of unresolved class Bar 2713 // } 2714 // iput x = v1 2715 // } } 2716 // when we merge v1 following the if-the-else it results in Conflict 2717 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2718 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2719 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2720 // at compile time). 2721 return false; 2722 } 2723 if (oat_file_class_status == mirror::Class::kStatusError) { 2724 // Compile time verification failed with a hard error. This is caused by invalid instructions 2725 // in the class. These errors are unrecoverable. 2726 return false; 2727 } 2728 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2729 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2730 // not loading the class. 2731 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2732 // isn't a problem and this case shouldn't occur 2733 return false; 2734 } 2735 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2736 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2737 << ClassHelper(klass).GetDescriptor(); 2738 2739 return false; 2740} 2741 2742void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2743 const SirtRef<mirror::Class>& klass) { 2744 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2745 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2746 } 2747 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2748 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2749 } 2750} 2751 2752void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2753 mirror::ArtMethod* method) { 2754 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2755 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2756 if (code_item == NULL) { 2757 return; // native or abstract method 2758 } 2759 if (code_item->tries_size_ == 0) { 2760 return; // nothing to process 2761 } 2762 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2763 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2764 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2765 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2766 CatchHandlerIterator iterator(handlers_ptr); 2767 for (; iterator.HasNext(); iterator.Next()) { 2768 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2769 // unresolved exception types will be ignored by exception delivery 2770 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2771 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2772 if (exception_type == NULL) { 2773 DCHECK(Thread::Current()->IsExceptionPending()); 2774 Thread::Current()->ClearException(); 2775 } 2776 } 2777 } 2778 handlers_ptr = iterator.EndDataPointer(); 2779 } 2780} 2781 2782static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2783static void CheckProxyMethod(mirror::ArtMethod* method, 2784 SirtRef<mirror::ArtMethod>& prototype); 2785 2786mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2787 jobjectArray interfaces, jobject loader, 2788 jobjectArray methods, jobjectArray throws) { 2789 Thread* self = soa.Self(); 2790 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2791 sizeof(mirror::SynthesizedProxyClass))); 2792 if (klass.get() == NULL) { 2793 CHECK(self->IsExceptionPending()); // OOME. 2794 return NULL; 2795 } 2796 DCHECK(klass->GetClass() != NULL); 2797 klass->SetObjectSize(sizeof(mirror::Proxy)); 2798 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2799 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2800 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2801 klass->SetName(soa.Decode<mirror::String*>(name)); 2802 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2803 klass->SetDexCache(proxy_class->GetDexCache()); 2804 klass->SetStatus(mirror::Class::kStatusIdx, self); 2805 2806 // Instance fields are inherited, but we add a couple of static fields... 2807 { 2808 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2809 if (UNLIKELY(sfields == NULL)) { 2810 CHECK(self->IsExceptionPending()); // OOME. 2811 return NULL; 2812 } 2813 klass->SetSFields(sfields); 2814 } 2815 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2816 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2817 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2818 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2819 CHECK(self->IsExceptionPending()); // OOME. 2820 return NULL; 2821 } 2822 klass->SetStaticField(0, interfaces_sfield.get()); 2823 interfaces_sfield->SetDexFieldIndex(0); 2824 interfaces_sfield->SetDeclaringClass(klass.get()); 2825 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2826 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2827 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2828 if (UNLIKELY(throws_sfield.get() == NULL)) { 2829 CHECK(self->IsExceptionPending()); // OOME. 2830 return NULL; 2831 } 2832 klass->SetStaticField(1, throws_sfield.get()); 2833 throws_sfield->SetDexFieldIndex(1); 2834 throws_sfield->SetDeclaringClass(klass.get()); 2835 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2836 2837 // Proxies have 1 direct method, the constructor 2838 { 2839 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2840 if (UNLIKELY(directs == NULL)) { 2841 CHECK(self->IsExceptionPending()); // OOME. 2842 return NULL; 2843 } 2844 klass->SetDirectMethods(directs); 2845 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2846 if (UNLIKELY(constructor == NULL)) { 2847 CHECK(self->IsExceptionPending()); // OOME. 2848 return NULL; 2849 } 2850 klass->SetDirectMethod(0, constructor); 2851 } 2852 2853 // Create virtual method using specified prototypes. 2854 size_t num_virtual_methods = 2855 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2856 { 2857 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2858 if (UNLIKELY(virtuals == NULL)) { 2859 CHECK(self->IsExceptionPending()); // OOME. 2860 return NULL; 2861 } 2862 klass->SetVirtualMethods(virtuals); 2863 } 2864 for (size_t i = 0; i < num_virtual_methods; ++i) { 2865 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2866 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2867 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2868 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2869 if (UNLIKELY(clone == NULL)) { 2870 CHECK(self->IsExceptionPending()); // OOME. 2871 return NULL; 2872 } 2873 klass->SetVirtualMethod(i, clone); 2874 } 2875 2876 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2877 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2878 self->AssertNoPendingException(); 2879 2880 { 2881 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2882 // Link the fields and virtual methods, creating vtable and iftables 2883 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2884 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2885 if (!LinkClass(self, klass, sirt_interfaces)) { 2886 klass->SetStatus(mirror::Class::kStatusError, self); 2887 return nullptr; 2888 } 2889 2890 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2891 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2892 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2893 } 2894 2895 // sanity checks 2896 if (kIsDebugBuild) { 2897 CHECK(klass->GetIFields() == NULL); 2898 CheckProxyConstructor(klass->GetDirectMethod(0)); 2899 for (size_t i = 0; i < num_virtual_methods; ++i) { 2900 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2901 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2902 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2903 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2904 } 2905 2906 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2907 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2908 decoded_name->ToModifiedUtf8().c_str())); 2909 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2910 2911 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2912 decoded_name->ToModifiedUtf8().c_str())); 2913 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2914 2915 mirror::SynthesizedProxyClass* synth_proxy_class = 2916 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2917 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2918 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2919 } 2920 std::string descriptor(GetDescriptorForProxy(klass.get())); 2921 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2922 CHECK(existing == nullptr); 2923 return klass.get(); 2924} 2925 2926std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2927 DCHECK(proxy_class->IsProxyClass()); 2928 mirror::String* name = proxy_class->GetName(); 2929 DCHECK(name != NULL); 2930 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2931} 2932 2933mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2934 mirror::ArtMethod* proxy_method) { 2935 DCHECK(proxy_class->IsProxyClass()); 2936 DCHECK(proxy_method->IsProxyMethod()); 2937 // Locate the dex cache of the original interface/Object 2938 mirror::DexCache* dex_cache = NULL; 2939 { 2940 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2941 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2942 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2943 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2944 dex_cache = dex_caches_[i]; 2945 break; 2946 } 2947 } 2948 } 2949 CHECK(dex_cache != NULL); 2950 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2951 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2952 CHECK(resolved_method != NULL); 2953 return resolved_method; 2954} 2955 2956 2957mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2958 const SirtRef<mirror::Class>& klass, 2959 mirror::Class* proxy_class) { 2960 // Create constructor for Proxy that must initialize h 2961 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2962 proxy_class->GetDirectMethods(); 2963 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2964 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2965 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2966 // code_ too) 2967 mirror::ArtMethod* constructor = 2968 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2969 if (constructor == NULL) { 2970 CHECK(self->IsExceptionPending()); // OOME. 2971 return NULL; 2972 } 2973 // Make this constructor public and fix the class to be our Proxy version 2974 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2975 constructor->SetDeclaringClass(klass.get()); 2976 return constructor; 2977} 2978 2979static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2980 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2981 CHECK(constructor->IsConstructor()); 2982 MethodHelper mh(constructor); 2983 CHECK_STREQ(mh.GetName(), "<init>"); 2984 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2985 DCHECK(constructor->IsPublic()); 2986} 2987 2988mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2989 const SirtRef<mirror::Class>& klass, 2990 const SirtRef<mirror::ArtMethod>& prototype) { 2991 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2992 // prototype method 2993 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2994 prototype.get()); 2995 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2996 // as necessary 2997 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2998 if (UNLIKELY(method == NULL)) { 2999 CHECK(self->IsExceptionPending()); // OOME. 3000 return NULL; 3001 } 3002 3003 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3004 // the intersection of throw exceptions as defined in Proxy 3005 method->SetDeclaringClass(klass.get()); 3006 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3007 3008 // At runtime the method looks like a reference and argument saving method, clone the code 3009 // related parameters from this method. 3010 mirror::ArtMethod* refs_and_args = 3011 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 3012 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 3013 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 3014 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 3015 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3016 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3017 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3018 3019 return method; 3020} 3021 3022static void CheckProxyMethod(mirror::ArtMethod* method, 3023 SirtRef<mirror::ArtMethod>& prototype) 3024 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3025 // Basic sanity 3026 CHECK(!prototype->IsFinal()); 3027 CHECK(method->IsFinal()); 3028 CHECK(!method->IsAbstract()); 3029 3030 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3031 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3032 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3033 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3034 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3035 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3036 3037 MethodHelper mh(method); 3038 MethodHelper mh2(prototype.get()); 3039 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3040 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3041 // More complex sanity - via dex cache 3042 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3043} 3044 3045static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3046 bool can_init_parents) 3047 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3048 if (can_init_statics && can_init_parents) { 3049 return true; 3050 } 3051 if (!can_init_statics) { 3052 // Check if there's a class initializer. 3053 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3054 if (clinit != NULL) { 3055 return false; 3056 } 3057 // Check if there are encoded static values needing initialization. 3058 if (klass->NumStaticFields() != 0) { 3059 ClassHelper kh(klass); 3060 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3061 DCHECK(dex_class_def != NULL); 3062 if (dex_class_def->static_values_off_ != 0) { 3063 return false; 3064 } 3065 } 3066 } 3067 if (!klass->IsInterface() && klass->HasSuperClass()) { 3068 mirror::Class* super_class = klass->GetSuperClass(); 3069 if (!can_init_parents && !super_class->IsInitialized()) { 3070 return false; 3071 } else { 3072 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3073 return false; 3074 } 3075 } 3076 } 3077 return true; 3078} 3079 3080bool ClassLinker::IsInitialized() const { 3081 return init_done_; 3082} 3083 3084bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3085 bool can_init_parents) { 3086 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3087 3088 // Are we already initialized and therefore done? 3089 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3090 // an initialized class will never change its state. 3091 if (klass->IsInitialized()) { 3092 return true; 3093 } 3094 3095 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3096 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3097 return false; 3098 } 3099 3100 Thread* self = Thread::Current(); 3101 uint64_t t0; 3102 { 3103 ObjectLock<mirror::Class> lock(self, &klass); 3104 3105 // Re-check under the lock in case another thread initialized ahead of us. 3106 if (klass->IsInitialized()) { 3107 return true; 3108 } 3109 3110 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3111 if (klass->IsErroneous()) { 3112 ThrowEarlierClassFailure(klass.get()); 3113 return false; 3114 } 3115 3116 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3117 3118 if (!klass->IsVerified()) { 3119 VerifyClass(klass); 3120 if (!klass->IsVerified()) { 3121 // We failed to verify, expect either the klass to be erroneous or verification failed at 3122 // compile time. 3123 if (klass->IsErroneous()) { 3124 CHECK(self->IsExceptionPending()); 3125 } else { 3126 CHECK(Runtime::Current()->IsCompiler()); 3127 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3128 } 3129 return false; 3130 } 3131 } 3132 3133 // If the class is kStatusInitializing, either this thread is 3134 // initializing higher up the stack or another thread has beat us 3135 // to initializing and we need to wait. Either way, this 3136 // invocation of InitializeClass will not be responsible for 3137 // running <clinit> and will return. 3138 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3139 // We caught somebody else in the act; was it us? 3140 if (klass->GetClinitThreadId() == self->GetTid()) { 3141 // Yes. That's fine. Return so we can continue initializing. 3142 return true; 3143 } 3144 // No. That's fine. Wait for another thread to finish initializing. 3145 return WaitForInitializeClass(klass, self, lock); 3146 } 3147 3148 if (!ValidateSuperClassDescriptors(klass)) { 3149 klass->SetStatus(mirror::Class::kStatusError, self); 3150 return false; 3151 } 3152 3153 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3154 3155 // From here out other threads may observe that we're initializing and so changes of state 3156 // require the a notification. 3157 klass->SetClinitThreadId(self->GetTid()); 3158 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3159 3160 t0 = NanoTime(); 3161 } 3162 3163 // Initialize super classes, must be done while initializing for the JLS. 3164 if (!klass->IsInterface() && klass->HasSuperClass()) { 3165 mirror::Class* super_class = klass->GetSuperClass(); 3166 if (!super_class->IsInitialized()) { 3167 CHECK(!super_class->IsInterface()); 3168 CHECK(can_init_parents); 3169 SirtRef<mirror::Class> sirt_super(self, super_class); 3170 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3171 if (!super_initialized) { 3172 // The super class was verified ahead of entering initializing, we should only be here if 3173 // the super class became erroneous due to initialization. 3174 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3175 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3176 << " that has unexpected status " << sirt_super->GetStatus() 3177 << "\nPending exception:\n" 3178 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3179 ObjectLock<mirror::Class> lock(self, &klass); 3180 // Initialization failed because the super-class is erroneous. 3181 klass->SetStatus(mirror::Class::kStatusError, self); 3182 return false; 3183 } 3184 } 3185 } 3186 3187 if (klass->NumStaticFields() > 0) { 3188 ClassHelper kh(klass.get()); 3189 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3190 CHECK(dex_class_def != NULL); 3191 const DexFile& dex_file = kh.GetDexFile(); 3192 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3193 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3194 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3195 this, *dex_class_def); 3196 if (it.HasNext()) { 3197 CHECK(can_init_statics); 3198 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3199 SafeMap<uint32_t, mirror::ArtField*> field_map; 3200 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3201 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3202 if (Runtime::Current()->IsActiveTransaction()) { 3203 it.ReadValueToField<true>(field_map.Get(i)); 3204 } else { 3205 it.ReadValueToField<false>(field_map.Get(i)); 3206 } 3207 } 3208 } 3209 } 3210 3211 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3212 if (clinit != NULL) { 3213 CHECK(can_init_statics); 3214 if (LIKELY(Runtime::Current()->IsStarted())) { 3215 JValue result; 3216 clinit->Invoke(self, NULL, 0, &result, "V"); 3217 } else { 3218 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3219 } 3220 } 3221 3222 uint64_t t1 = NanoTime(); 3223 3224 bool success = true; 3225 { 3226 ObjectLock<mirror::Class> lock(self, &klass); 3227 3228 if (self->IsExceptionPending()) { 3229 WrapExceptionInInitializer(); 3230 klass->SetStatus(mirror::Class::kStatusError, self); 3231 success = false; 3232 } else { 3233 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3234 RuntimeStats* thread_stats = self->GetStats(); 3235 ++global_stats->class_init_count; 3236 ++thread_stats->class_init_count; 3237 global_stats->class_init_time_ns += (t1 - t0); 3238 thread_stats->class_init_time_ns += (t1 - t0); 3239 // Set the class as initialized except if failed to initialize static fields. 3240 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3241 if (VLOG_IS_ON(class_linker)) { 3242 ClassHelper kh(klass.get()); 3243 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3244 } 3245 // Opportunistically set static method trampolines to their destination. 3246 FixupStaticTrampolines(klass.get()); 3247 } 3248 } 3249 return success; 3250} 3251 3252bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3253 ObjectLock<mirror::Class>& lock) 3254 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3255 while (true) { 3256 self->AssertNoPendingException(); 3257 CHECK(!klass->IsInitialized()); 3258 lock.WaitIgnoringInterrupts(); 3259 3260 // When we wake up, repeat the test for init-in-progress. If 3261 // there's an exception pending (only possible if 3262 // "interruptShouldThrow" was set), bail out. 3263 if (self->IsExceptionPending()) { 3264 WrapExceptionInInitializer(); 3265 klass->SetStatus(mirror::Class::kStatusError, self); 3266 return false; 3267 } 3268 // Spurious wakeup? Go back to waiting. 3269 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3270 continue; 3271 } 3272 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3273 // Compile time initialization failed. 3274 return false; 3275 } 3276 if (klass->IsErroneous()) { 3277 // The caller wants an exception, but it was thrown in a 3278 // different thread. Synthesize one here. 3279 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3280 PrettyDescriptor(klass.get()).c_str()); 3281 return false; 3282 } 3283 if (klass->IsInitialized()) { 3284 return true; 3285 } 3286 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3287 << klass->GetStatus(); 3288 } 3289 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3290} 3291 3292bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3293 if (klass->IsInterface()) { 3294 return true; 3295 } 3296 Thread* self = Thread::Current(); 3297 // begin with the methods local to the superclass 3298 if (klass->HasSuperClass() && 3299 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3300 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3301 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3302 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3303 if (method != super->GetVTable()->Get(i) && 3304 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3305 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3306 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3307 PrettyDescriptor(super.get()).c_str()); 3308 return false; 3309 } 3310 } 3311 } 3312 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3313 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3314 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3315 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3316 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3317 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3318 method->GetDeclaringClass())) { 3319 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3320 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3321 PrettyMethod(method).c_str(), 3322 PrettyDescriptor(interface.get()).c_str()); 3323 return false; 3324 } 3325 } 3326 } 3327 } 3328 return true; 3329} 3330 3331// Returns true if classes referenced by the signature of the method are the 3332// same classes in klass1 as they are in klass2. 3333bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3334 mirror::ArtMethod* method, 3335 mirror::Class* klass1, 3336 mirror::Class* klass2) { 3337 if (klass1 == klass2) { 3338 return true; 3339 } 3340 CHECK(klass1 != nullptr); 3341 CHECK(klass2 != nullptr); 3342 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3343 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3344 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3345 const DexFile::ProtoId& proto_id = 3346 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3347 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3348 const char* descriptor = it.GetDescriptor(); 3349 if (descriptor == nullptr) { 3350 break; 3351 } 3352 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3353 // Found a non-primitive type. 3354 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3355 return false; 3356 } 3357 } 3358 } 3359 // Check the return type 3360 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3361 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3362 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3363 return false; 3364 } 3365 } 3366 return true; 3367} 3368 3369// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3370bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3371 SirtRef<mirror::ClassLoader>& loader1, 3372 SirtRef<mirror::ClassLoader>& loader2) { 3373 CHECK(descriptor != nullptr); 3374 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3375 if (found1.get() == nullptr) { 3376 self->ClearException(); 3377 } 3378 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3379 if (found2 == nullptr) { 3380 self->ClearException(); 3381 } 3382 return found1.get() == found2; 3383} 3384 3385bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3386 bool can_init_parents) { 3387 DCHECK(c.get() != NULL); 3388 if (c->IsInitialized()) { 3389 return true; 3390 } 3391 3392 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3393 if (!success) { 3394 if (can_init_fields && can_init_parents) { 3395 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3396 } 3397 } 3398 return success; 3399} 3400 3401void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3402 mirror::Class* c, 3403 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3404 const byte* class_data = dex_file.GetClassData(dex_class_def); 3405 ClassDataItemIterator it(dex_file, class_data); 3406 Thread* self = Thread::Current(); 3407 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3408 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3409 CHECK(!kMovingFields); 3410 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3411 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3412 } 3413} 3414 3415bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3416 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3417 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3418 if (!LinkSuperClass(klass)) { 3419 return false; 3420 } 3421 if (!LinkMethods(klass, interfaces)) { 3422 return false; 3423 } 3424 if (!LinkInstanceFields(klass)) { 3425 return false; 3426 } 3427 if (!LinkStaticFields(klass)) { 3428 return false; 3429 } 3430 CreateReferenceInstanceOffsets(klass); 3431 CreateReferenceStaticOffsets(klass); 3432 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3433 klass->SetStatus(mirror::Class::kStatusResolved, self); 3434 return true; 3435} 3436 3437bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3438 const DexFile& dex_file) { 3439 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3440 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3441 uint16_t super_class_idx = class_def.superclass_idx_; 3442 if (super_class_idx != DexFile::kDexNoIndex16) { 3443 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3444 if (super_class == NULL) { 3445 DCHECK(Thread::Current()->IsExceptionPending()); 3446 return false; 3447 } 3448 // Verify 3449 if (!klass->CanAccess(super_class)) { 3450 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3451 PrettyDescriptor(super_class).c_str(), 3452 PrettyDescriptor(klass.get()).c_str()); 3453 return false; 3454 } 3455 klass->SetSuperClass(super_class); 3456 } 3457 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3458 if (interfaces != NULL) { 3459 for (size_t i = 0; i < interfaces->Size(); i++) { 3460 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3461 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3462 if (interface == NULL) { 3463 DCHECK(Thread::Current()->IsExceptionPending()); 3464 return false; 3465 } 3466 // Verify 3467 if (!klass->CanAccess(interface)) { 3468 // TODO: the RI seemed to ignore this in my testing. 3469 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3470 PrettyDescriptor(interface).c_str(), 3471 PrettyDescriptor(klass.get()).c_str()); 3472 return false; 3473 } 3474 } 3475 } 3476 // Mark the class as loaded. 3477 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3478 return true; 3479} 3480 3481bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3482 CHECK(!klass->IsPrimitive()); 3483 mirror::Class* super = klass->GetSuperClass(); 3484 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3485 if (super != NULL) { 3486 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3487 return false; 3488 } 3489 return true; 3490 } 3491 if (super == NULL) { 3492 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3493 PrettyDescriptor(klass.get()).c_str()); 3494 return false; 3495 } 3496 // Verify 3497 if (super->IsFinal() || super->IsInterface()) { 3498 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3499 PrettyDescriptor(super).c_str(), 3500 PrettyDescriptor(klass.get()).c_str(), 3501 super->IsFinal() ? "declared final" : "an interface"); 3502 return false; 3503 } 3504 if (!klass->CanAccess(super)) { 3505 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3506 PrettyDescriptor(super).c_str(), 3507 PrettyDescriptor(klass.get()).c_str()); 3508 return false; 3509 } 3510 3511 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3512 if (super->IsFinalizable()) { 3513 klass->SetFinalizable(); 3514 } 3515 3516 // Inherit reference flags (if any) from the superclass. 3517 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3518 if (reference_flags != 0) { 3519 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3520 } 3521 // Disallow custom direct subclasses of java.lang.ref.Reference. 3522 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3523 ThrowLinkageError(klass.get(), 3524 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3525 PrettyDescriptor(klass.get()).c_str()); 3526 return false; 3527 } 3528 3529 if (kIsDebugBuild) { 3530 // Ensure super classes are fully resolved prior to resolving fields.. 3531 while (super != NULL) { 3532 CHECK(super->IsResolved()); 3533 super = super->GetSuperClass(); 3534 } 3535 } 3536 return true; 3537} 3538 3539// Populate the class vtable and itable. Compute return type indices. 3540bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3541 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3542 if (klass->IsInterface()) { 3543 // No vtable. 3544 size_t count = klass->NumVirtualMethods(); 3545 if (!IsUint(16, count)) { 3546 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3547 return false; 3548 } 3549 for (size_t i = 0; i < count; ++i) { 3550 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3551 } 3552 // Link interface method tables 3553 return LinkInterfaceMethods(klass, interfaces); 3554 } else { 3555 // Link virtual and interface method tables 3556 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3557 } 3558 return true; 3559} 3560 3561bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3562 Thread* self = Thread::Current(); 3563 if (klass->HasSuperClass()) { 3564 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3565 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3566 CHECK_LE(actual_count, max_count); 3567 // TODO: do not assign to the vtable field until it is fully constructed. 3568 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3569 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3570 if (UNLIKELY(vtable.get() == NULL)) { 3571 CHECK(self->IsExceptionPending()); // OOME. 3572 return false; 3573 } 3574 // See if any of our virtual methods override the superclass. 3575 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3576 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3577 MethodHelper local_mh(local_method); 3578 size_t j = 0; 3579 for (; j < actual_count; ++j) { 3580 mirror::ArtMethod* super_method = vtable->Get(j); 3581 MethodHelper super_mh(super_method); 3582 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3583 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3584 if (super_method->IsFinal()) { 3585 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3586 PrettyMethod(local_method).c_str(), 3587 super_mh.GetDeclaringClassDescriptor()); 3588 return false; 3589 } 3590 vtable->Set<false>(j, local_method); 3591 local_method->SetMethodIndex(j); 3592 break; 3593 } else { 3594 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3595 << " would have incorrectly overridden the package-private method in " 3596 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3597 } 3598 } 3599 } 3600 if (j == actual_count) { 3601 // Not overriding, append. 3602 vtable->Set<false>(actual_count, local_method); 3603 local_method->SetMethodIndex(actual_count); 3604 actual_count += 1; 3605 } 3606 } 3607 if (!IsUint(16, actual_count)) { 3608 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3609 return false; 3610 } 3611 // Shrink vtable if possible 3612 CHECK_LE(actual_count, max_count); 3613 if (actual_count < max_count) { 3614 vtable.reset(vtable->CopyOf(self, actual_count)); 3615 if (UNLIKELY(vtable.get() == NULL)) { 3616 CHECK(self->IsExceptionPending()); // OOME. 3617 return false; 3618 } 3619 } 3620 klass->SetVTable(vtable.get()); 3621 } else { 3622 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3623 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3624 if (!IsUint(16, num_virtual_methods)) { 3625 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3626 return false; 3627 } 3628 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3629 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3630 if (UNLIKELY(vtable.get() == NULL)) { 3631 CHECK(self->IsExceptionPending()); // OOME. 3632 return false; 3633 } 3634 for (size_t i = 0; i < num_virtual_methods; ++i) { 3635 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3636 vtable->Set<false>(i, virtual_method); 3637 virtual_method->SetMethodIndex(i & 0xFFFF); 3638 } 3639 klass->SetVTable(vtable.get()); 3640 } 3641 return true; 3642} 3643 3644bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3645 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3646 // Set the imt table to be all conflicts by default. 3647 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3648 size_t super_ifcount; 3649 if (klass->HasSuperClass()) { 3650 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3651 } else { 3652 super_ifcount = 0; 3653 } 3654 size_t ifcount = super_ifcount; 3655 uint32_t num_interfaces; 3656 { 3657 ClassHelper kh(klass.get()); 3658 num_interfaces = 3659 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3660 ifcount += num_interfaces; 3661 for (size_t i = 0; i < num_interfaces; i++) { 3662 mirror::Class* interface = 3663 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3664 ifcount += interface->GetIfTableCount(); 3665 } 3666 } 3667 if (ifcount == 0) { 3668 // Class implements no interfaces. 3669 DCHECK_EQ(klass->GetIfTableCount(), 0); 3670 DCHECK(klass->GetIfTable() == NULL); 3671 return true; 3672 } 3673 if (ifcount == super_ifcount) { 3674 // Class implements same interfaces as parent, are any of these not marker interfaces? 3675 bool has_non_marker_interface = false; 3676 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3677 for (size_t i = 0; i < ifcount; ++i) { 3678 if (super_iftable->GetMethodArrayCount(i) > 0) { 3679 has_non_marker_interface = true; 3680 break; 3681 } 3682 } 3683 if (!has_non_marker_interface) { 3684 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3685 klass->SetIfTable(super_iftable); 3686 return true; 3687 } 3688 } 3689 Thread* self = Thread::Current(); 3690 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3691 if (UNLIKELY(iftable.get() == NULL)) { 3692 CHECK(self->IsExceptionPending()); // OOME. 3693 return false; 3694 } 3695 if (super_ifcount != 0) { 3696 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3697 for (size_t i = 0; i < super_ifcount; i++) { 3698 mirror::Class* super_interface = super_iftable->GetInterface(i); 3699 iftable->SetInterface(i, super_interface); 3700 } 3701 } 3702 // Flatten the interface inheritance hierarchy. 3703 size_t idx = super_ifcount; 3704 for (size_t i = 0; i < num_interfaces; i++) { 3705 ClassHelper kh(klass.get()); 3706 mirror::Class* interface = 3707 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3708 DCHECK(interface != NULL); 3709 if (!interface->IsInterface()) { 3710 ClassHelper ih(interface); 3711 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3712 PrettyDescriptor(klass.get()).c_str(), 3713 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3714 return false; 3715 } 3716 // Check if interface is already in iftable 3717 bool duplicate = false; 3718 for (size_t j = 0; j < idx; j++) { 3719 mirror::Class* existing_interface = iftable->GetInterface(j); 3720 if (existing_interface == interface) { 3721 duplicate = true; 3722 break; 3723 } 3724 } 3725 if (!duplicate) { 3726 // Add this non-duplicate interface. 3727 iftable->SetInterface(idx++, interface); 3728 // Add this interface's non-duplicate super-interfaces. 3729 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3730 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3731 bool super_duplicate = false; 3732 for (size_t k = 0; k < idx; k++) { 3733 mirror::Class* existing_interface = iftable->GetInterface(k); 3734 if (existing_interface == super_interface) { 3735 super_duplicate = true; 3736 break; 3737 } 3738 } 3739 if (!super_duplicate) { 3740 iftable->SetInterface(idx++, super_interface); 3741 } 3742 } 3743 } 3744 } 3745 // Shrink iftable in case duplicates were found 3746 if (idx < ifcount) { 3747 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3748 if (UNLIKELY(iftable.get() == NULL)) { 3749 CHECK(self->IsExceptionPending()); // OOME. 3750 return false; 3751 } 3752 ifcount = idx; 3753 } else { 3754 CHECK_EQ(idx, ifcount); 3755 } 3756 klass->SetIfTable(iftable.get()); 3757 3758 // If we're an interface, we don't need the vtable pointers, so we're done. 3759 if (klass->IsInterface()) { 3760 return true; 3761 } 3762 // Allocate imtable 3763 bool imtable_changed = false; 3764 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3765 if (UNLIKELY(imtable.get() == NULL)) { 3766 CHECK(self->IsExceptionPending()); // OOME. 3767 return false; 3768 } 3769 std::vector<mirror::ArtMethod*> miranda_list; 3770 for (size_t i = 0; i < ifcount; ++i) { 3771 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3772 if (num_methods > 0) { 3773 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3774 method_array(self, AllocArtMethodArray(self, num_methods)); 3775 if (UNLIKELY(method_array.get() == nullptr)) { 3776 CHECK(self->IsExceptionPending()); // OOME. 3777 return false; 3778 } 3779 iftable->SetMethodArray(i, method_array.get()); 3780 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3781 klass->GetVTableDuringLinking()); 3782 for (size_t j = 0; j < num_methods; ++j) { 3783 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3784 MethodHelper interface_mh(interface_method); 3785 int32_t k; 3786 // For each method listed in the interface's method list, find the 3787 // matching method in our class's method list. We want to favor the 3788 // subclass over the superclass, which just requires walking 3789 // back from the end of the vtable. (This only matters if the 3790 // superclass defines a private method and this class redefines 3791 // it -- otherwise it would use the same vtable slot. In .dex files 3792 // those don't end up in the virtual method table, so it shouldn't 3793 // matter which direction we go. We walk it backward anyway.) 3794 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3795 mirror::ArtMethod* vtable_method = vtable->Get(k); 3796 MethodHelper vtable_mh(vtable_method); 3797 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3798 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3799 ThrowIllegalAccessError(klass.get(), 3800 "Method '%s' implementing interface method '%s' is not public", 3801 PrettyMethod(vtable_method).c_str(), 3802 PrettyMethod(interface_method).c_str()); 3803 return false; 3804 } 3805 method_array->Set<false>(j, vtable_method); 3806 // Place method in imt if entry is empty, place conflict otherwise. 3807 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3808 if (imtable->Get(imt_index) == NULL) { 3809 imtable->Set<false>(imt_index, vtable_method); 3810 imtable_changed = true; 3811 } else { 3812 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3813 } 3814 break; 3815 } 3816 } 3817 if (k < 0) { 3818 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3819 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3820 mirror::ArtMethod* mir_method = miranda_list[mir]; 3821 MethodHelper vtable_mh(mir_method); 3822 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3823 miranda_method.reset(miranda_list[mir]); 3824 break; 3825 } 3826 } 3827 if (miranda_method.get() == NULL) { 3828 // Point the interface table at a phantom slot. 3829 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3830 if (UNLIKELY(miranda_method.get() == NULL)) { 3831 CHECK(self->IsExceptionPending()); // OOME. 3832 return false; 3833 } 3834 // TODO: If a methods move then the miranda_list may hold stale references. 3835 miranda_list.push_back(miranda_method.get()); 3836 } 3837 method_array->Set<false>(j, miranda_method.get()); 3838 } 3839 } 3840 } 3841 } 3842 if (imtable_changed) { 3843 // Fill in empty entries in interface method table with conflict. 3844 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3845 for (size_t i = 0; i < kImtSize; i++) { 3846 if (imtable->Get(i) == NULL) { 3847 imtable->Set<false>(i, imt_conflict_method); 3848 } 3849 } 3850 klass->SetImTable(imtable.get()); 3851 } 3852 if (!miranda_list.empty()) { 3853 int old_method_count = klass->NumVirtualMethods(); 3854 int new_method_count = old_method_count + miranda_list.size(); 3855 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3856 if (old_method_count == 0) { 3857 virtuals = AllocArtMethodArray(self, new_method_count); 3858 } else { 3859 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3860 } 3861 if (UNLIKELY(virtuals == NULL)) { 3862 CHECK(self->IsExceptionPending()); // OOME. 3863 return false; 3864 } 3865 klass->SetVirtualMethods(virtuals); 3866 3867 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3868 vtable(self, klass->GetVTableDuringLinking()); 3869 CHECK(vtable.get() != NULL); 3870 int old_vtable_count = vtable->GetLength(); 3871 int new_vtable_count = old_vtable_count + miranda_list.size(); 3872 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3873 if (UNLIKELY(vtable.get() == NULL)) { 3874 CHECK(self->IsExceptionPending()); // OOME. 3875 return false; 3876 } 3877 for (size_t i = 0; i < miranda_list.size(); ++i) { 3878 mirror::ArtMethod* method = miranda_list[i]; 3879 // Leave the declaring class alone as type indices are relative to it 3880 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3881 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3882 klass->SetVirtualMethod(old_method_count + i, method); 3883 vtable->Set<false>(old_vtable_count + i, method); 3884 } 3885 // TODO: do not assign to the vtable field until it is fully constructed. 3886 klass->SetVTable(vtable.get()); 3887 } 3888 3889 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3890 for (int i = 0; i < vtable->GetLength(); ++i) { 3891 CHECK(vtable->Get(i) != NULL); 3892 } 3893 3894// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3895 3896 return true; 3897} 3898 3899bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3900 CHECK(klass.get() != NULL); 3901 return LinkFields(klass, false); 3902} 3903 3904bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3905 CHECK(klass.get() != NULL); 3906 size_t allocated_class_size = klass->GetClassSize(); 3907 bool success = LinkFields(klass, true); 3908 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3909 return success; 3910} 3911 3912struct LinkFieldsComparator { 3913 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3914 } 3915 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3916 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3917 NO_THREAD_SAFETY_ANALYSIS { 3918 // First come reference fields, then 64-bit, and finally 32-bit 3919 FieldHelper fh1(field1); 3920 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3921 FieldHelper fh2(field2); 3922 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3923 if (type1 != type2) { 3924 bool is_primitive1 = type1 != Primitive::kPrimNot; 3925 bool is_primitive2 = type2 != Primitive::kPrimNot; 3926 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3927 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3928 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3929 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3930 if (order1 != order2) { 3931 return order1 < order2; 3932 } 3933 } 3934 // same basic group? then sort by string. 3935 const char* name1 = fh1.GetName(); 3936 const char* name2 = fh2.GetName(); 3937 return strcmp(name1, name2) < 0; 3938 } 3939}; 3940 3941bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3942 size_t num_fields = 3943 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3944 3945 mirror::ObjectArray<mirror::ArtField>* fields = 3946 is_static ? klass->GetSFields() : klass->GetIFields(); 3947 3948 // Initialize size and field_offset 3949 size_t size; 3950 MemberOffset field_offset(0); 3951 if (is_static) { 3952 size = klass->GetClassSize(); 3953 field_offset = mirror::Class::FieldsOffset(); 3954 } else { 3955 mirror::Class* super_class = klass->GetSuperClass(); 3956 if (super_class != NULL) { 3957 CHECK(super_class->IsResolved()); 3958 field_offset = MemberOffset(super_class->GetObjectSize()); 3959 } 3960 size = field_offset.Uint32Value(); 3961 } 3962 3963 CHECK_EQ(num_fields == 0, fields == NULL); 3964 3965 // we want a relatively stable order so that adding new fields 3966 // minimizes disruption of C++ version such as Class and Method. 3967 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3968 for (size_t i = 0; i < num_fields; i++) { 3969 mirror::ArtField* f = fields->Get(i); 3970 CHECK(f != NULL); 3971 grouped_and_sorted_fields.push_back(f); 3972 } 3973 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3974 LinkFieldsComparator()); 3975 3976 // References should be at the front. 3977 size_t current_field = 0; 3978 size_t num_reference_fields = 0; 3979 for (; current_field < num_fields; current_field++) { 3980 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3981 FieldHelper fh(field); 3982 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3983 bool isPrimitive = type != Primitive::kPrimNot; 3984 if (isPrimitive) { 3985 break; // past last reference, move on to the next phase 3986 } 3987 grouped_and_sorted_fields.pop_front(); 3988 num_reference_fields++; 3989 fields->Set<false>(current_field, field); 3990 field->SetOffset(field_offset); 3991 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3992 } 3993 3994 // Now we want to pack all of the double-wide fields together. If 3995 // we're not aligned, though, we want to shuffle one 32-bit field 3996 // into place. If we can't find one, we'll have to pad it. 3997 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3998 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3999 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4000 FieldHelper fh(field); 4001 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4002 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4003 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4004 continue; 4005 } 4006 fields->Set<false>(current_field++, field); 4007 field->SetOffset(field_offset); 4008 // drop the consumed field 4009 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4010 break; 4011 } 4012 // whether we found a 32-bit field for padding or not, we advance 4013 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4014 } 4015 4016 // Alignment is good, shuffle any double-wide fields forward, and 4017 // finish assigning field offsets to all fields. 4018 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4019 while (!grouped_and_sorted_fields.empty()) { 4020 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4021 grouped_and_sorted_fields.pop_front(); 4022 FieldHelper fh(field); 4023 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4024 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4025 fields->Set<false>(current_field, field); 4026 field->SetOffset(field_offset); 4027 field_offset = MemberOffset(field_offset.Uint32Value() + 4028 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4029 ? sizeof(uint64_t) 4030 : sizeof(uint32_t))); 4031 current_field++; 4032 } 4033 4034 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4035 if (!is_static && 4036 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4037 // We know there are no non-reference fields in the Reference classes, and we know 4038 // that 'referent' is alphabetically last, so this is easy... 4039 CHECK_EQ(num_reference_fields, num_fields); 4040 FieldHelper fh(fields->Get(num_fields - 1)); 4041 CHECK_STREQ(fh.GetName(), "referent"); 4042 --num_reference_fields; 4043 } 4044 4045 if (kIsDebugBuild) { 4046 // Make sure that all reference fields appear before 4047 // non-reference fields, and all double-wide fields are aligned. 4048 bool seen_non_ref = false; 4049 for (size_t i = 0; i < num_fields; i++) { 4050 mirror::ArtField* field = fields->Get(i); 4051 if (false) { // enable to debug field layout 4052 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4053 << " class=" << PrettyClass(klass.get()) 4054 << " field=" << PrettyField(field) 4055 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 4056 false); 4057 } 4058 FieldHelper fh(field); 4059 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4060 bool is_primitive = type != Primitive::kPrimNot; 4061 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4062 && (strcmp("referent", fh.GetName()) == 0)) { 4063 is_primitive = true; // We lied above, so we have to expect a lie here. 4064 } 4065 if (is_primitive) { 4066 if (!seen_non_ref) { 4067 seen_non_ref = true; 4068 DCHECK_EQ(num_reference_fields, i); 4069 } 4070 } else { 4071 DCHECK(!seen_non_ref); 4072 } 4073 } 4074 if (!seen_non_ref) { 4075 DCHECK_EQ(num_fields, num_reference_fields); 4076 } 4077 } 4078 size = field_offset.Uint32Value(); 4079 // Update klass 4080 if (is_static) { 4081 klass->SetNumReferenceStaticFields(num_reference_fields); 4082 klass->SetClassSize(size); 4083 } else { 4084 klass->SetNumReferenceInstanceFields(num_reference_fields); 4085 if (!klass->IsVariableSize()) { 4086 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4087 size_t previous_size = klass->GetObjectSize(); 4088 if (previous_size != 0) { 4089 // Make sure that we didn't originally have an incorrect size. 4090 CHECK_EQ(previous_size, size); 4091 } 4092 klass->SetObjectSize(size); 4093 } 4094 } 4095 return true; 4096} 4097 4098// Set the bitmap of reference offsets, refOffsets, from the ifields 4099// list. 4100void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4101 uint32_t reference_offsets = 0; 4102 mirror::Class* super_class = klass->GetSuperClass(); 4103 if (super_class != NULL) { 4104 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4105 // If our superclass overflowed, we don't stand a chance. 4106 if (reference_offsets == CLASS_WALK_SUPER) { 4107 klass->SetReferenceInstanceOffsets(reference_offsets); 4108 return; 4109 } 4110 } 4111 CreateReferenceOffsets(klass, false, reference_offsets); 4112} 4113 4114void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4115 CreateReferenceOffsets(klass, true, 0); 4116} 4117 4118void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4119 uint32_t reference_offsets) { 4120 size_t num_reference_fields = 4121 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4122 : klass->NumReferenceInstanceFieldsDuringLinking(); 4123 mirror::ObjectArray<mirror::ArtField>* fields = 4124 is_static ? klass->GetSFields() : klass->GetIFields(); 4125 // All of the fields that contain object references are guaranteed 4126 // to be at the beginning of the fields list. 4127 for (size_t i = 0; i < num_reference_fields; ++i) { 4128 // Note that byte_offset is the offset from the beginning of 4129 // object, not the offset into instance data 4130 mirror::ArtField* field = fields->Get(i); 4131 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4132 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4133 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4134 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4135 CHECK_NE(new_bit, 0U); 4136 reference_offsets |= new_bit; 4137 } else { 4138 reference_offsets = CLASS_WALK_SUPER; 4139 break; 4140 } 4141 } 4142 // Update fields in klass 4143 if (is_static) { 4144 klass->SetReferenceStaticOffsets(reference_offsets); 4145 } else { 4146 klass->SetReferenceInstanceOffsets(reference_offsets); 4147 } 4148} 4149 4150mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4151 const SirtRef<mirror::DexCache>& dex_cache) { 4152 DCHECK(dex_cache.get() != nullptr); 4153 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4154 if (resolved != NULL) { 4155 return resolved; 4156 } 4157 uint32_t utf16_length; 4158 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4159 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4160 dex_cache->SetResolvedString(string_idx, string); 4161 return string; 4162} 4163 4164mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4165 mirror::Class* referrer) { 4166 Thread* self = Thread::Current(); 4167 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4168 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4169 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4170} 4171 4172mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4173 const SirtRef<mirror::DexCache>& dex_cache, 4174 const SirtRef<mirror::ClassLoader>& class_loader) { 4175 DCHECK(dex_cache.get() != NULL); 4176 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4177 if (resolved == NULL) { 4178 Thread* self = Thread::Current(); 4179 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4180 resolved = FindClass(self, descriptor, class_loader); 4181 if (resolved != NULL) { 4182 // TODO: we used to throw here if resolved's class loader was not the 4183 // boot class loader. This was to permit different classes with the 4184 // same name to be loaded simultaneously by different loaders 4185 dex_cache->SetResolvedType(type_idx, resolved); 4186 } else { 4187 CHECK(self->IsExceptionPending()) 4188 << "Expected pending exception for failed resolution of: " << descriptor; 4189 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4190 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4191 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4192 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4193 self->ClearException(); 4194 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4195 self->GetException(NULL)->SetCause(cause.get()); 4196 } 4197 } 4198 } 4199 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4200 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4201 return resolved; 4202} 4203 4204mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4205 uint32_t method_idx, 4206 const SirtRef<mirror::DexCache>& dex_cache, 4207 const SirtRef<mirror::ClassLoader>& class_loader, 4208 mirror::ArtMethod* referrer, 4209 InvokeType type) { 4210 DCHECK(dex_cache.get() != NULL); 4211 // Check for hit in the dex cache. 4212 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4213 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4214 return resolved; 4215 } 4216 // Fail, get the declaring class. 4217 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4218 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4219 if (klass == NULL) { 4220 DCHECK(Thread::Current()->IsExceptionPending()); 4221 return NULL; 4222 } 4223 // Scan using method_idx, this saves string compares but will only hit for matching dex 4224 // caches/files. 4225 switch (type) { 4226 case kDirect: // Fall-through. 4227 case kStatic: 4228 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4229 break; 4230 case kInterface: 4231 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4232 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4233 break; 4234 case kSuper: // Fall-through. 4235 case kVirtual: 4236 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4237 break; 4238 default: 4239 LOG(FATAL) << "Unreachable - invocation type: " << type; 4240 } 4241 if (resolved == NULL) { 4242 // Search by name, which works across dex files. 4243 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4244 const Signature signature = dex_file.GetMethodSignature(method_id); 4245 switch (type) { 4246 case kDirect: // Fall-through. 4247 case kStatic: 4248 resolved = klass->FindDirectMethod(name, signature); 4249 break; 4250 case kInterface: 4251 resolved = klass->FindInterfaceMethod(name, signature); 4252 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4253 break; 4254 case kSuper: // Fall-through. 4255 case kVirtual: 4256 resolved = klass->FindVirtualMethod(name, signature); 4257 break; 4258 } 4259 } 4260 if (resolved != NULL) { 4261 // We found a method, check for incompatible class changes. 4262 if (resolved->CheckIncompatibleClassChange(type)) { 4263 resolved = NULL; 4264 } 4265 } 4266 if (resolved != NULL) { 4267 // Be a good citizen and update the dex cache to speed subsequent calls. 4268 dex_cache->SetResolvedMethod(method_idx, resolved); 4269 return resolved; 4270 } else { 4271 // We failed to find the method which means either an access error, an incompatible class 4272 // change, or no such method. First try to find the method among direct and virtual methods. 4273 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4274 const Signature signature = dex_file.GetMethodSignature(method_id); 4275 switch (type) { 4276 case kDirect: 4277 case kStatic: 4278 resolved = klass->FindVirtualMethod(name, signature); 4279 break; 4280 case kInterface: 4281 case kVirtual: 4282 case kSuper: 4283 resolved = klass->FindDirectMethod(name, signature); 4284 break; 4285 } 4286 4287 // If we found something, check that it can be accessed by the referrer. 4288 if (resolved != NULL && referrer != NULL) { 4289 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4290 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4291 if (!referring_class->CanAccess(methods_class)) { 4292 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4293 resolved, type); 4294 return NULL; 4295 } else if (!referring_class->CanAccessMember(methods_class, 4296 resolved->GetAccessFlags())) { 4297 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4298 return NULL; 4299 } 4300 } 4301 4302 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4303 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4304 switch (type) { 4305 case kDirect: 4306 case kStatic: 4307 if (resolved != NULL) { 4308 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4309 } else { 4310 resolved = klass->FindInterfaceMethod(name, signature); 4311 if (resolved != NULL) { 4312 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4313 } else { 4314 ThrowNoSuchMethodError(type, klass, name, signature); 4315 } 4316 } 4317 break; 4318 case kInterface: 4319 if (resolved != NULL) { 4320 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4321 } else { 4322 resolved = klass->FindVirtualMethod(name, signature); 4323 if (resolved != NULL) { 4324 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4325 } else { 4326 ThrowNoSuchMethodError(type, klass, name, signature); 4327 } 4328 } 4329 break; 4330 case kSuper: 4331 ThrowNoSuchMethodError(type, klass, name, signature); 4332 break; 4333 case kVirtual: 4334 if (resolved != NULL) { 4335 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4336 } else { 4337 resolved = klass->FindInterfaceMethod(name, signature); 4338 if (resolved != NULL) { 4339 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4340 } else { 4341 ThrowNoSuchMethodError(type, klass, name, signature); 4342 } 4343 } 4344 break; 4345 } 4346 DCHECK(Thread::Current()->IsExceptionPending()); 4347 return NULL; 4348 } 4349} 4350 4351mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4352 const SirtRef<mirror::DexCache>& dex_cache, 4353 const SirtRef<mirror::ClassLoader>& class_loader, 4354 bool is_static) { 4355 DCHECK(dex_cache.get() != nullptr); 4356 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4357 if (resolved != NULL) { 4358 return resolved; 4359 } 4360 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4361 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4362 if (klass == NULL) { 4363 DCHECK(Thread::Current()->IsExceptionPending()); 4364 return NULL; 4365 } 4366 4367 if (is_static) { 4368 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4369 } else { 4370 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4371 } 4372 4373 if (resolved == NULL) { 4374 const char* name = dex_file.GetFieldName(field_id); 4375 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4376 if (is_static) { 4377 resolved = klass->FindStaticField(name, type); 4378 } else { 4379 resolved = klass->FindInstanceField(name, type); 4380 } 4381 if (resolved == NULL) { 4382 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4383 return NULL; 4384 } 4385 } 4386 dex_cache->SetResolvedField(field_idx, resolved); 4387 return resolved; 4388} 4389 4390mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4391 uint32_t field_idx, 4392 const SirtRef<mirror::DexCache>& dex_cache, 4393 const SirtRef<mirror::ClassLoader>& class_loader) { 4394 DCHECK(dex_cache.get() != nullptr); 4395 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4396 if (resolved != NULL) { 4397 return resolved; 4398 } 4399 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4400 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4401 if (klass == NULL) { 4402 DCHECK(Thread::Current()->IsExceptionPending()); 4403 return NULL; 4404 } 4405 4406 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4407 StringPiece type(dex_file.StringDataByIdx( 4408 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4409 resolved = klass->FindField(name, type); 4410 if (resolved != NULL) { 4411 dex_cache->SetResolvedField(field_idx, resolved); 4412 } else { 4413 ThrowNoSuchFieldError("", klass, type, name); 4414 } 4415 return resolved; 4416} 4417 4418const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4419 uint32_t* length) { 4420 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4421 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4422 const DexFile& dex_file = *dex_cache->GetDexFile(); 4423 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4424 return dex_file.GetMethodShorty(method_id, length); 4425} 4426 4427void ClassLinker::DumpAllClasses(int flags) { 4428 if (dex_cache_image_class_lookup_required_) { 4429 MoveImageClassesToClassTable(); 4430 } 4431 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4432 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4433 std::vector<mirror::Class*> all_classes; 4434 { 4435 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4436 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4437 all_classes.push_back(it.second); 4438 } 4439 } 4440 4441 for (size_t i = 0; i < all_classes.size(); ++i) { 4442 all_classes[i]->DumpClass(std::cerr, flags); 4443 } 4444} 4445 4446void ClassLinker::DumpForSigQuit(std::ostream& os) { 4447 if (dex_cache_image_class_lookup_required_) { 4448 MoveImageClassesToClassTable(); 4449 } 4450 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4451 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4452} 4453 4454size_t ClassLinker::NumLoadedClasses() { 4455 if (dex_cache_image_class_lookup_required_) { 4456 MoveImageClassesToClassTable(); 4457 } 4458 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4459 return class_table_.size(); 4460} 4461 4462pid_t ClassLinker::GetClassesLockOwner() { 4463 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4464} 4465 4466pid_t ClassLinker::GetDexLockOwner() { 4467 return dex_lock_.GetExclusiveOwnerTid(); 4468} 4469 4470void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4471 DCHECK(!init_done_); 4472 4473 DCHECK(klass != NULL); 4474 DCHECK(klass->GetClassLoader() == NULL); 4475 4476 DCHECK(class_roots_ != NULL); 4477 DCHECK(class_roots_->Get(class_root) == NULL); 4478 class_roots_->Set<false>(class_root, klass); 4479} 4480 4481} // namespace art 4482