class_linker.cc revision 64e7ac0bcc2ea96c0e09fe3f4c86a5ad755a975c
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 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 195 VLOG(startup) << "ClassLinker::Init"; 196 CHECK(Runtime::Current()->IsCompiler()); 197 198 CHECK(!init_done_); 199 200 // java_lang_Class comes first, it's needed for AllocClass 201 Thread* self = Thread::Current(); 202 gc::Heap* heap = Runtime::Current()->GetHeap(); 203 // The GC can't handle an object with a null class since we can't get the size of this object. 204 heap->IncrementDisableMovingGC(self); 205 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 206 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), VoidFunctor()))); 207 CHECK(java_lang_Class.get() != NULL); 208 mirror::Class::SetClassClass(java_lang_Class.get()); 209 java_lang_Class->SetClass(java_lang_Class.get()); 210 if (kUseBakerOrBrooksReadBarrier) { 211 java_lang_Class->AssertReadBarrierPointer(); 212 } 213 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 214 heap->DecrementDisableMovingGC(self); 215 // AllocClass(mirror::Class*) can now be used 216 217 // Class[] is used for reflection support. 218 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 219 class_array_class->SetComponentType(java_lang_Class.get()); 220 221 // java_lang_Object comes next so that object_array_class can be created. 222 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 223 CHECK(java_lang_Object.get() != NULL); 224 // backfill Object as the super class of Class. 225 java_lang_Class->SetSuperClass(java_lang_Object.get()); 226 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 227 228 // Object[] next to hold class roots. 229 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 230 object_array_class->SetComponentType(java_lang_Object.get()); 231 232 // Setup the char class to be used for char[]. 233 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 234 235 // Setup the char[] class to be used for String. 236 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 237 char_array_class->SetComponentType(char_class.get()); 238 mirror::CharArray::SetArrayClass(char_array_class.get()); 239 240 // Setup String. 241 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 242 mirror::String::SetClass(java_lang_String.get()); 243 java_lang_String->SetObjectSize(sizeof(mirror::String)); 244 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 245 246 // Create storage for root classes, save away our work so far (requires descriptors). 247 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 248 kClassRootsMax); 249 CHECK(class_roots_ != NULL); 250 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 251 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 252 SetClassRoot(kClassArrayClass, class_array_class.get()); 253 SetClassRoot(kObjectArrayClass, object_array_class.get()); 254 SetClassRoot(kCharArrayClass, char_array_class.get()); 255 SetClassRoot(kJavaLangString, java_lang_String.get()); 256 257 // Setup the primitive type classes. 258 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 259 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 260 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 261 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 262 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 263 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 264 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 265 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 266 267 // Create array interface entries to populate once we can load system classes. 268 array_iftable_ = AllocIfTable(self, 2); 269 270 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 271 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 272 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 273 mirror::IntArray::SetArrayClass(int_array_class.get()); 274 SetClassRoot(kIntArrayClass, int_array_class.get()); 275 276 // now that these are registered, we can use AllocClass() and AllocObjectArray 277 278 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 279 SirtRef<mirror::Class> 280 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 281 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 282 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 283 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 284 285 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 286 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 287 sizeof(mirror::ArtFieldClass))); 288 CHECK(java_lang_reflect_ArtField.get() != NULL); 289 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 290 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 291 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 292 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 293 294 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 295 sizeof(mirror::ArtMethodClass))); 296 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 297 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 298 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 299 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 300 301 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 302 303 // Set up array classes for string, field, method 304 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 305 sizeof(mirror::Class))); 306 object_array_string->SetComponentType(java_lang_String.get()); 307 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 308 309 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 310 sizeof(mirror::Class))); 311 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 312 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 313 314 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 315 sizeof(mirror::Class))); 316 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 317 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 318 319 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 320 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 321 // these roots. 322 CHECK_NE(0U, boot_class_path.size()); 323 for (size_t i = 0; i != boot_class_path.size(); ++i) { 324 const DexFile* dex_file = boot_class_path[i]; 325 CHECK(dex_file != NULL); 326 AppendToBootClassPath(*dex_file); 327 } 328 329 // now we can use FindSystemClass 330 331 // run char class through InitializePrimitiveClass to finish init 332 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 333 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 334 335 // Create runtime resolution and imt conflict methods. Also setup the default imt. 336 Runtime* runtime = Runtime::Current(); 337 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 338 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 339 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 340 341 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 342 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 343 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 344 CHECK_EQ(java_lang_Object.get(), Object_class); 345 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 346 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 347 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 348 CHECK_EQ(java_lang_String.get(), String_class); 349 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 350 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 351 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 352 CHECK_EQ(java_lang_String.get(), String_class); 353 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 354 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 355 356 // Setup the primitive array type classes - can't be done until Object has a vtable. 357 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 358 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 359 360 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 361 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 362 363 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 364 CHECK_EQ(char_array_class.get(), found_char_array_class); 365 366 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 367 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 368 369 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 370 CHECK_EQ(int_array_class.get(), found_int_array_class); 371 372 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 373 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 374 375 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 376 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 377 378 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 379 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 380 381 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 382 CHECK_EQ(class_array_class.get(), found_class_array_class); 383 384 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 385 CHECK_EQ(object_array_class.get(), found_object_array_class); 386 387 // Setup the single, global copy of "iftable". 388 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 389 CHECK(java_lang_Cloneable != NULL); 390 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 391 CHECK(java_io_Serializable != NULL); 392 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 393 // crawl up and explicitly list all of the supers as well. 394 array_iftable_->SetInterface(0, java_lang_Cloneable); 395 array_iftable_->SetInterface(1, java_io_Serializable); 396 397 // Sanity check Class[] and Object[]'s interfaces. 398 ClassHelper kh(class_array_class.get()); 399 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 400 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 401 kh.ChangeClass(object_array_class.get()); 402 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 403 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 404 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 405 // dex_cache_ fields and register them in class_table_. 406 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 407 CHECK_EQ(java_lang_Class.get(), Class_class); 408 409 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 410 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 411 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 412 413 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 414 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 415 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 416 417 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 418 CHECK_EQ(object_array_string.get(), String_array_class); 419 420 mirror::Class* Art_method_array_class = 421 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 422 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 423 424 mirror::Class* Art_field_array_class = 425 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 426 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 427 428 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 429 430 // Create java.lang.reflect.Proxy root. 431 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 432 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 433 434 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 435 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 436 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 437 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 438 java_lang_ref_FinalizerReference->SetAccessFlags( 439 java_lang_ref_FinalizerReference->GetAccessFlags() | 440 kAccClassIsReference | kAccClassIsFinalizerReference); 441 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 442 java_lang_ref_PhantomReference->SetAccessFlags( 443 java_lang_ref_PhantomReference->GetAccessFlags() | 444 kAccClassIsReference | kAccClassIsPhantomReference); 445 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 446 java_lang_ref_SoftReference->SetAccessFlags( 447 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 448 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 449 java_lang_ref_WeakReference->SetAccessFlags( 450 java_lang_ref_WeakReference->GetAccessFlags() | 451 kAccClassIsReference | kAccClassIsWeakReference); 452 453 // Setup the ClassLoader, verifying the object_size_. 454 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 455 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 456 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 457 458 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 459 // java.lang.StackTraceElement as a convenience. 460 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 461 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 462 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 463 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 464 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 465 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 466 467 FinishInit(self); 468 469 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 470} 471 472void ClassLinker::FinishInit(Thread* self) { 473 VLOG(startup) << "ClassLinker::FinishInit entering"; 474 475 // Let the heap know some key offsets into java.lang.ref instances 476 // Note: we hard code the field indexes here rather than using FindInstanceField 477 // as the types of the field can't be resolved prior to the runtime being 478 // fully initialized 479 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 480 mirror::Class* java_lang_ref_FinalizerReference = 481 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 482 483 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 484 FieldHelper fh(pendingNext); 485 CHECK_STREQ(fh.GetName(), "pendingNext"); 486 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 487 488 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 489 fh.ChangeField(queue); 490 CHECK_STREQ(fh.GetName(), "queue"); 491 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 492 493 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 494 fh.ChangeField(queueNext); 495 CHECK_STREQ(fh.GetName(), "queueNext"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 497 498 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 499 fh.ChangeField(referent); 500 CHECK_STREQ(fh.GetName(), "referent"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 502 503 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 504 fh.ChangeField(zombie); 505 CHECK_STREQ(fh.GetName(), "zombie"); 506 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 507 508 // ensure all class_roots_ are initialized 509 for (size_t i = 0; i < kClassRootsMax; i++) { 510 ClassRoot class_root = static_cast<ClassRoot>(i); 511 mirror::Class* klass = GetClassRoot(class_root); 512 CHECK(klass != NULL); 513 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 514 // note SetClassRoot does additional validation. 515 // if possible add new checks there to catch errors early 516 } 517 518 CHECK(array_iftable_ != NULL); 519 520 // disable the slow paths in FindClass and CreatePrimitiveClass now 521 // that Object, Class, and Object[] are setup 522 init_done_ = true; 523 524 VLOG(startup) << "ClassLinker::FinishInit exiting"; 525} 526 527void ClassLinker::RunRootClinits() { 528 Thread* self = Thread::Current(); 529 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 530 mirror::Class* c = GetClassRoot(ClassRoot(i)); 531 if (!c->IsArrayClass() && !c->IsPrimitive()) { 532 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 533 EnsureInitialized(sirt_class, true, true); 534 self->AssertNoPendingException(); 535 } 536 } 537} 538 539bool ClassLinker::GenerateOatFile(const char* dex_filename, 540 int oat_fd, 541 const char* oat_cache_filename, 542 std::string* error_msg) { 543 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 544 std::string dex2oat(GetAndroidRoot()); 545 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 546 547 gc::Heap* heap = Runtime::Current()->GetHeap(); 548 std::string boot_image_option("--boot-image="); 549 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 550 551 std::string dex_file_option("--dex-file="); 552 dex_file_option += dex_filename; 553 554 std::string oat_fd_option("--oat-fd="); 555 StringAppendF(&oat_fd_option, "%d", oat_fd); 556 557 std::string oat_location_option("--oat-location="); 558 oat_location_option += oat_cache_filename; 559 560 std::vector<std::string> argv; 561 argv.push_back(dex2oat); 562 argv.push_back("--runtime-arg"); 563 argv.push_back("-Xms64m"); 564 argv.push_back("--runtime-arg"); 565 argv.push_back("-Xmx64m"); 566 argv.push_back("--runtime-arg"); 567 argv.push_back("-classpath"); 568 argv.push_back("--runtime-arg"); 569 argv.push_back(Runtime::Current()->GetClassPathString()); 570 571 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 572 573 if (!Runtime::Current()->IsVerificationEnabled()) { 574 argv.push_back("--compiler-filter=verify-none"); 575 } 576 577 if (!kIsTargetBuild) { 578 argv.push_back("--host"); 579 } 580 581 argv.push_back(boot_image_option); 582 argv.push_back(dex_file_option); 583 argv.push_back(oat_fd_option); 584 argv.push_back(oat_location_option); 585 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 586 for (size_t i = 0; i < compiler_options.size(); ++i) { 587 argv.push_back(compiler_options[i].c_str()); 588 } 589 590 return Exec(argv, error_msg); 591} 592 593const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 594 WriterMutexLock mu(Thread::Current(), dex_lock_); 595 if (kIsDebugBuild) { 596 for (size_t i = 0; i < oat_files_.size(); ++i) { 597 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 598 } 599 } 600 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 601 oat_files_.push_back(oat_file); 602 return oat_file; 603} 604 605OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 606 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 607 OatFile* oat_file = space->ReleaseOatFile(); 608 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 609 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 610 return *oat_file; 611} 612 613const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 614 const char* dex_location = dex_file.GetLocation().c_str(); 615 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 616 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 617} 618 619const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 620 const uint32_t* const dex_location_checksum) { 621 ReaderMutexLock mu(Thread::Current(), dex_lock_); 622 for (size_t i = 0; i < oat_files_.size(); i++) { 623 const OatFile* oat_file = oat_files_[i]; 624 DCHECK(oat_file != NULL); 625 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 626 dex_location_checksum, 627 false); 628 if (oat_dex_file != NULL) { 629 return oat_file; 630 } 631 } 632 return NULL; 633} 634 635const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 636 uint32_t dex_location_checksum, 637 const char* oat_location, 638 std::string* error_msg) { 639 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 640 !Runtime::Current()->IsCompiler(), 641 error_msg)); 642 if (oat_file.get() == nullptr) { 643 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 644 error_msg->c_str()); 645 return nullptr; 646 } 647 Runtime* runtime = Runtime::Current(); 648 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 649 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 650 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 651 if (expected_image_oat_checksum != actual_image_oat_checksum) { 652 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 653 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 654 actual_image_oat_checksum); 655 return nullptr; 656 } 657 658 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 659 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 660 if (expected_image_oat_offset != actual_image_oat_offset) { 661 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 662 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 663 actual_image_oat_offset); 664 return nullptr; 665 } 666 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 667 &dex_location_checksum); 668 if (oat_dex_file == nullptr) { 669 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 670 dex_location); 671 return nullptr; 672 } 673 uint32_t expected_dex_checksum = dex_location_checksum; 674 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 675 if (expected_dex_checksum != actual_dex_checksum) { 676 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 677 "found 0x%x", oat_location, expected_dex_checksum, 678 actual_dex_checksum); 679 return nullptr; 680 } 681 const DexFile* dex_file = oat_dex_file->OpenDexFile(error_msg); 682 if (dex_file != nullptr) { 683 RegisterOatFile(oat_file.release()); 684 } 685 return dex_file; 686} 687 688class ScopedFlock { 689 public: 690 ScopedFlock() {} 691 692 bool Init(const char* filename, std::string* error_msg) { 693 while (true) { 694 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 695 if (file_.get() == NULL) { 696 *error_msg = StringPrintf("Failed to open file '%s': %s", filename, strerror(errno)); 697 return false; 698 } 699 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 700 if (flock_result != 0) { 701 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 702 return false; 703 } 704 struct stat fstat_stat; 705 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 706 if (fstat_result != 0) { 707 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 708 return false; 709 } 710 struct stat stat_stat; 711 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 712 if (stat_result != 0) { 713 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 714 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 715 continue; 716 } 717 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 718 LOG(WARNING) << "File changed while locking, will retry: " << filename; 719 continue; 720 } 721 return true; 722 } 723 } 724 725 File& GetFile() { 726 return *file_; 727 } 728 729 ~ScopedFlock() { 730 if (file_.get() != NULL) { 731 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 732 CHECK_EQ(0, flock_result); 733 } 734 } 735 736 private: 737 UniquePtr<File> file_; 738 739 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 740}; 741 742const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 743 uint32_t dex_location_checksum, 744 const char* oat_location, 745 std::vector<std::string>* error_msgs) { 746 // We play a locking game here so that if two different processes 747 // race to generate (or worse, one tries to open a partial generated 748 // file) we will be okay. This is actually common with apps that use 749 // DexClassLoader to work around the dex method reference limit and 750 // that have a background service running in a separate process. 751 ScopedFlock scoped_flock; 752 std::string error_msg; 753 if (!scoped_flock.Init(oat_location, &error_msg)) { 754 error_msgs->push_back(error_msg); 755 return nullptr; 756 } 757 758 // Check if we already have an up-to-date output file 759 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 760 oat_location, &error_msg); 761 if (dex_file != nullptr) { 762 return dex_file; 763 } 764 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 765 dex_location, oat_location, error_msg.c_str()); 766 VLOG(class_linker) << compound_msg; 767 error_msgs->push_back(compound_msg); 768 769 // Generate the output oat file for the dex file 770 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 771 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) { 772 CHECK(!error_msg.empty()); 773 error_msgs->push_back(error_msg); 774 return nullptr; 775 } 776 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 777 !Runtime::Current()->IsCompiler(), 778 &error_msg)); 779 if (oat_file.get() == nullptr) { 780 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 781 oat_location, error_msg.c_str()); 782 error_msgs->push_back(compound_msg); 783 return nullptr; 784 } 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 RegisterOatFile(oat_file.release()); 800 return result; 801} 802 803bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 804 const char* dex_location, 805 uint32_t dex_location_checksum, 806 std::string* error_msg) { 807 Runtime* runtime = Runtime::Current(); 808 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 809 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 810 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 811 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 812 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 813 814 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 815 if (oat_dex_file == NULL) { 816 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 817 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 818 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 819 for (size_t i = 0; i < oat_dex_files.size(); i++) { 820 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 821 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 822 oat_file->GetLocation().c_str(), 823 oat_dex_file->GetDexFileLocation().c_str()); 824 } 825 return false; 826 } 827 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 828 829 if (image_check && dex_check) { 830 return true; 831 } 832 833 if (!image_check) { 834 ScopedObjectAccess soa(Thread::Current()); 835 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 836 oat_file->GetLocation().c_str(), 837 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 838 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 839 image_oat_checksum, image_oat_data_begin); 840 } 841 if (!dex_check) { 842 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 843 oat_file->GetLocation().c_str(), 844 oat_dex_file->GetDexFileLocationChecksum(), 845 dex_location, dex_location_checksum); 846 } 847 return false; 848} 849 850const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 851 const char* dex_location, 852 std::string* error_msg, 853 bool* open_failed) { 854 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 855 if (oat_file.get() == nullptr) { 856 *open_failed = true; 857 return nullptr; 858 } 859 *open_failed = false; 860 const DexFile* dex_file = nullptr; 861 uint32_t dex_location_checksum; 862 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 863 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 864 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 865 // directory. 866 const OatFile::OatDexFile* oat_dex_file = 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 dex_file = oat_dex_file->OpenDexFile(error_msg); 874 } else { 875 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 876 error_msg); 877 if (!verified) { 878 return nullptr; 879 } 880 dex_file = oat_file->GetOatDexFile(dex_location, 881 &dex_location_checksum)->OpenDexFile(error_msg); 882 } 883 if (dex_file != nullptr) { 884 RegisterOatFile(oat_file.release()); 885 } 886 return dex_file; 887} 888 889const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 890 const uint32_t* const dex_location_checksum, 891 std::vector<std::string>* error_msgs) { 892 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 893 dex_location_checksum); 894 if (open_oat_file != nullptr) { 895 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 896 dex_location_checksum); 897 std::string error_msg; 898 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 899 if (ret == nullptr) { 900 error_msgs->push_back(error_msg); 901 } 902 return ret; 903 } 904 905 // Look for an existing file next to dex. for example, for 906 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 907 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 908 bool open_failed; 909 std::string error_msg; 910 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 911 &error_msg, &open_failed); 912 if (dex_file != nullptr) { 913 return dex_file; 914 } 915 if (dex_location_checksum == nullptr) { 916 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 917 "%s: %s", odex_filename.c_str(), dex_location, 918 error_msg.c_str())); 919 return nullptr; 920 } 921 922 std::string cache_error_msg; 923 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 924 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 925 dalvik_cache.c_str())); 926 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 927 &open_failed); 928 if (dex_file != nullptr) { 929 return dex_file; 930 } 931 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 932 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 933 } 934 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 935 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 936 cache_location.c_str(), cache_error_msg.c_str()); 937 VLOG(class_linker) << compound_msg; 938 error_msgs->push_back(compound_msg); 939 940 // Try to generate oat file if it wasn't found or was obsolete. 941 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 942 cache_location.c_str(), error_msgs); 943} 944 945const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 946 ReaderMutexLock mu(Thread::Current(), dex_lock_); 947 for (size_t i = 0; i < oat_files_.size(); i++) { 948 const OatFile* oat_file = oat_files_[i]; 949 DCHECK(oat_file != nullptr); 950 if (oat_file->GetLocation() == oat_location) { 951 return oat_file; 952 } 953 } 954 return nullptr; 955} 956 957const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 958 std::string* error_msg) { 959 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 960 if (oat_file != nullptr) { 961 return oat_file; 962 } 963 964 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 965 error_msg); 966 if (oat_file == NULL) { 967 return NULL; 968 } 969 return oat_file; 970} 971 972static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 973 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 974 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 975 976 DCHECK(obj != NULL); 977 DCHECK(class_linker != NULL); 978 979 if (obj->IsArtMethod()) { 980 mirror::ArtMethod* method = obj->AsArtMethod(); 981 if (!method->IsNative()) { 982 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 983 if (method != Runtime::Current()->GetResolutionMethod()) { 984 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 985 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 986 } 987 } 988 } 989} 990 991void ClassLinker::InitFromImage() { 992 VLOG(startup) << "ClassLinker::InitFromImage entering"; 993 CHECK(!init_done_); 994 995 Thread* self = Thread::Current(); 996 gc::Heap* heap = Runtime::Current()->GetHeap(); 997 gc::space::ImageSpace* space = heap->GetImageSpace(); 998 dex_cache_image_class_lookup_required_ = true; 999 CHECK(space != NULL); 1000 OatFile& oat_file = GetImageOatFile(space); 1001 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1002 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1003 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1004 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1005 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1006 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1007 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1008 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1009 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1010 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1011 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1012 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1013 1014 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1015 self, 1016 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1017 class_roots_ = class_roots.get(); 1018 1019 // Special case of setting up the String class early so that we can test arbitrary objects 1020 // as being Strings or not 1021 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1022 1023 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1024 static_cast<uint32_t>(dex_caches->GetLength())); 1025 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1026 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1027 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1028 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1029 nullptr); 1030 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1031 std::string error_msg; 1032 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1033 if (dex_file == NULL) { 1034 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1035 << " from within oat file " << oat_file.GetLocation() 1036 << " error '" << error_msg << "'"; 1037 } 1038 1039 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1040 1041 AppendToBootClassPath(*dex_file, dex_cache); 1042 } 1043 1044 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1045 // bitmap walk. 1046 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1047 1048 // Set entry point to interpreter if in InterpretOnly mode. 1049 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1050 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1051 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1052 } 1053 1054 // reinit class_roots_ 1055 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1056 class_roots_ = class_roots.get(); 1057 1058 // reinit array_iftable_ from any array class instance, they should be == 1059 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1060 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1061 // String class root was set above 1062 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1063 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1064 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1065 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1066 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1067 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1068 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1069 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1070 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1071 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1072 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1073 1074 FinishInit(self); 1075 1076 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1077} 1078 1079// Keep in sync with InitCallback. Anything we visit, we need to 1080// reinit references to when reinitializing a ClassLinker from a 1081// mapped image. 1082void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1083 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1084 Thread* self = Thread::Current(); 1085 { 1086 ReaderMutexLock mu(self, dex_lock_); 1087 if ((flags & kVisitRootFlagAllRoots) != 0) { 1088 for (mirror::DexCache*& dex_cache : dex_caches_) { 1089 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1090 } 1091 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1092 for (size_t index : new_dex_cache_roots_) { 1093 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1094 } 1095 } 1096 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1097 new_dex_cache_roots_.clear(); 1098 } 1099 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1100 log_new_dex_caches_roots_ = true; 1101 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1102 log_new_dex_caches_roots_ = false; 1103 } 1104 } 1105 { 1106 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1107 if ((flags & kVisitRootFlagAllRoots) != 0) { 1108 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1109 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1110 } 1111 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1112 for (auto& pair : new_class_roots_) { 1113 mirror::Object* old_ref = pair.second; 1114 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1115 if (UNLIKELY(pair.second != old_ref)) { 1116 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1117 // corresponding object. This is slow, but luckily for us, this may only happen with a 1118 // concurrent moving GC. 1119 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1120 it != end && it->first == pair.first; ++it) { 1121 // If the class stored matches the old class, update it to the new value. 1122 if (old_ref == it->second) { 1123 it->second = pair.second; 1124 } 1125 } 1126 } 1127 } 1128 } 1129 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1130 new_class_roots_.clear(); 1131 } 1132 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1133 log_new_class_table_roots_ = true; 1134 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1135 log_new_class_table_roots_ = false; 1136 } 1137 // We deliberately ignore the class roots in the image since we 1138 // handle image roots by using the MS/CMS rescanning of dirty cards. 1139 } 1140 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1141 DCHECK(array_iftable_ != nullptr); 1142 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1143 if (find_array_class_cache_[i] != nullptr) { 1144 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1145 kRootVMInternal); 1146 } 1147 } 1148} 1149 1150void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1151 if (dex_cache_image_class_lookup_required_) { 1152 MoveImageClassesToClassTable(); 1153 } 1154 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1155 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1156 if (!visitor(it.second, arg)) { 1157 return; 1158 } 1159 } 1160} 1161 1162static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1163 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1164 classes->insert(c); 1165 return true; 1166} 1167 1168void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1169 std::set<mirror::Class*> classes; 1170 VisitClasses(GetClassesVisitor, &classes); 1171 for (mirror::Class* klass : classes) { 1172 if (!visitor(klass, arg)) { 1173 return; 1174 } 1175 } 1176} 1177 1178ClassLinker::~ClassLinker() { 1179 mirror::Class::ResetClass(); 1180 mirror::String::ResetClass(); 1181 mirror::ArtField::ResetClass(); 1182 mirror::ArtMethod::ResetClass(); 1183 mirror::BooleanArray::ResetArrayClass(); 1184 mirror::ByteArray::ResetArrayClass(); 1185 mirror::CharArray::ResetArrayClass(); 1186 mirror::DoubleArray::ResetArrayClass(); 1187 mirror::FloatArray::ResetArrayClass(); 1188 mirror::IntArray::ResetArrayClass(); 1189 mirror::LongArray::ResetArrayClass(); 1190 mirror::ShortArray::ResetArrayClass(); 1191 mirror::Throwable::ResetClass(); 1192 mirror::StackTraceElement::ResetClass(); 1193 STLDeleteElements(&boot_class_path_); 1194 STLDeleteElements(&oat_files_); 1195} 1196 1197mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1198 gc::Heap* heap = Runtime::Current()->GetHeap(); 1199 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1200 SirtRef<mirror::DexCache> dex_cache( 1201 self, down_cast<mirror::DexCache*>( 1202 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize(), 1203 VoidFunctor()))); 1204 if (dex_cache.get() == NULL) { 1205 return NULL; 1206 } 1207 SirtRef<mirror::String> 1208 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1209 if (location.get() == NULL) { 1210 return NULL; 1211 } 1212 SirtRef<mirror::ObjectArray<mirror::String> > 1213 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1214 if (strings.get() == NULL) { 1215 return NULL; 1216 } 1217 SirtRef<mirror::ObjectArray<mirror::Class> > 1218 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1219 if (types.get() == NULL) { 1220 return NULL; 1221 } 1222 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1223 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1224 if (methods.get() == NULL) { 1225 return NULL; 1226 } 1227 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1228 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1229 if (fields.get() == NULL) { 1230 return NULL; 1231 } 1232 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1233 fields.get()); 1234 return dex_cache.get(); 1235} 1236 1237// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1238// fence. 1239class InitializeClassVisitor { 1240 public: 1241 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1242 } 1243 1244 void operator()(mirror::Object* obj, size_t usable_size) const 1245 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1246 DCHECK_LE(class_size_, usable_size); 1247 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1248 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1249 // DCHECK(klass->IsClass()); 1250 klass->SetClassSize(class_size_); 1251 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1252 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1253 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1254 } 1255 1256 private: 1257 const uint32_t class_size_; 1258 1259 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1260}; 1261 1262mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1263 uint32_t class_size) { 1264 DCHECK_GE(class_size, sizeof(mirror::Class)); 1265 gc::Heap* heap = Runtime::Current()->GetHeap(); 1266 InitializeClassVisitor visitor(class_size); 1267 mirror::Object* k = 1268 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1269 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1270 if (UNLIKELY(k == nullptr)) { 1271 CHECK(self->IsExceptionPending()); // OOME. 1272 return nullptr; 1273 } 1274 return k->AsClass(); 1275} 1276 1277mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1278 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1279} 1280 1281mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1282 return down_cast<mirror::ArtField*>( 1283 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1284} 1285 1286mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1287 return down_cast<mirror::ArtMethod*>( 1288 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1289} 1290 1291mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1292 Thread* self, size_t length) { 1293 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1294 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1295} 1296 1297static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1298 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1299 DCHECK(klass != NULL); 1300 // Wait for the class if it has not already been linked. 1301 if (!klass->IsResolved() && !klass->IsErroneous()) { 1302 SirtRef<mirror::Class> sirt_class(self, klass); 1303 ObjectLock<mirror::Class> lock(self, &sirt_class); 1304 // Check for circular dependencies between classes. 1305 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1306 ThrowClassCircularityError(sirt_class.get()); 1307 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1308 return nullptr; 1309 } 1310 // Wait for the pending initialization to complete. 1311 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1312 lock.WaitIgnoringInterrupts(); 1313 } 1314 klass = sirt_class.get(); 1315 } 1316 if (klass->IsErroneous()) { 1317 ThrowEarlierClassFailure(klass); 1318 return nullptr; 1319 } 1320 // Return the loaded class. No exceptions should be pending. 1321 CHECK(klass->IsResolved()) << PrettyClass(klass); 1322 self->AssertNoPendingException(); 1323 return klass; 1324} 1325 1326mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1327 const SirtRef<mirror::ClassLoader>& class_loader) { 1328 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1329 DCHECK(self != nullptr); 1330 self->AssertNoPendingException(); 1331 if (descriptor[1] == '\0') { 1332 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1333 // for primitive classes that aren't backed by dex files. 1334 return FindPrimitiveClass(descriptor[0]); 1335 } 1336 // Find the class in the loaded classes table. 1337 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1338 if (klass != NULL) { 1339 return EnsureResolved(self, klass); 1340 } 1341 // Class is not yet loaded. 1342 if (descriptor[0] == '[') { 1343 return CreateArrayClass(self, descriptor, class_loader); 1344 } else if (class_loader.get() == nullptr) { 1345 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1346 if (pair.second != NULL) { 1347 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1348 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1349 } 1350 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1351 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1352 // throw of a NoClassDefFoundError. 1353 if (IsInBootClassPath(descriptor)) { 1354 mirror::Class* system_class = FindSystemClass(self, descriptor); 1355 CHECK(system_class != NULL); 1356 return system_class; 1357 } 1358 // Next try the compile time class path. 1359 const std::vector<const DexFile*>* class_path; 1360 { 1361 ScopedObjectAccessUnchecked soa(self); 1362 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1363 soa.AddLocalReference<jobject>(class_loader.get())); 1364 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1365 } 1366 1367 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1368 if (pair.second != NULL) { 1369 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1370 } 1371 1372 } else { 1373 ScopedObjectAccessUnchecked soa(self); 1374 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1375 soa.AddLocalReference<jobject>(class_loader.get())); 1376 std::string class_name_string(DescriptorToDot(descriptor)); 1377 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1378 { 1379 ScopedThreadStateChange tsc(self, kNative); 1380 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1381 soa.Env()->NewStringUTF(class_name_string.c_str())); 1382 if (class_name_object.get() == NULL) { 1383 return NULL; 1384 } 1385 CHECK(class_loader_object.get() != NULL); 1386 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1387 WellKnownClasses::java_lang_ClassLoader_loadClass, 1388 class_name_object.get())); 1389 } 1390 if (self->IsExceptionPending()) { 1391 // If the ClassLoader threw, pass that exception up. 1392 return NULL; 1393 } else if (result.get() == NULL) { 1394 // broken loader - throw NPE to be compatible with Dalvik 1395 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1396 class_name_string.c_str()).c_str()); 1397 return NULL; 1398 } else { 1399 // success, return mirror::Class* 1400 return soa.Decode<mirror::Class*>(result.get()); 1401 } 1402 } 1403 1404 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1405 return NULL; 1406} 1407 1408mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1409 const SirtRef<mirror::ClassLoader>& class_loader, 1410 const DexFile& dex_file, 1411 const DexFile::ClassDef& dex_class_def) { 1412 Thread* self = Thread::Current(); 1413 SirtRef<mirror::Class> klass(self, NULL); 1414 // Load the class from the dex file. 1415 if (UNLIKELY(!init_done_)) { 1416 // finish up init of hand crafted class_roots_ 1417 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1418 klass.reset(GetClassRoot(kJavaLangObject)); 1419 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1420 klass.reset(GetClassRoot(kJavaLangClass)); 1421 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1422 klass.reset(GetClassRoot(kJavaLangString)); 1423 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1424 klass.reset(GetClassRoot(kJavaLangDexCache)); 1425 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1426 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1427 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1428 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1429 } else { 1430 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1431 } 1432 } else { 1433 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1434 } 1435 if (UNLIKELY(klass.get() == NULL)) { 1436 CHECK(self->IsExceptionPending()); // Expect an OOME. 1437 return NULL; 1438 } 1439 klass->SetDexCache(FindDexCache(dex_file)); 1440 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1441 // Check for a pending exception during load 1442 if (self->IsExceptionPending()) { 1443 klass->SetStatus(mirror::Class::kStatusError, self); 1444 return NULL; 1445 } 1446 ObjectLock<mirror::Class> lock(self, &klass); 1447 klass->SetClinitThreadId(self->GetTid()); 1448 // Add the newly loaded class to the loaded classes table. 1449 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1450 if (existing != NULL) { 1451 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1452 // this thread to block. 1453 return EnsureResolved(self, existing); 1454 } 1455 // Finish loading (if necessary) by finding parents 1456 CHECK(!klass->IsLoaded()); 1457 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1458 // Loading failed. 1459 klass->SetStatus(mirror::Class::kStatusError, self); 1460 return NULL; 1461 } 1462 CHECK(klass->IsLoaded()); 1463 // Link the class (if necessary) 1464 CHECK(!klass->IsResolved()); 1465 // TODO: Use fast jobjects? 1466 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1467 if (!LinkClass(self, klass, interfaces)) { 1468 // Linking failed. 1469 klass->SetStatus(mirror::Class::kStatusError, self); 1470 return NULL; 1471 } 1472 CHECK(klass->IsResolved()); 1473 1474 /* 1475 * We send CLASS_PREPARE events to the debugger from here. The 1476 * definition of "preparation" is creating the static fields for a 1477 * class and initializing them to the standard default values, but not 1478 * executing any code (that comes later, during "initialization"). 1479 * 1480 * We did the static preparation in LinkClass. 1481 * 1482 * The class has been prepared and resolved but possibly not yet verified 1483 * at this point. 1484 */ 1485 Dbg::PostClassPrepare(klass.get()); 1486 1487 return klass.get(); 1488} 1489 1490// Precomputes size that will be needed for Class, matching LinkStaticFields 1491uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1492 const DexFile::ClassDef& dex_class_def) { 1493 const byte* class_data = dex_file.GetClassData(dex_class_def); 1494 size_t num_ref = 0; 1495 size_t num_32 = 0; 1496 size_t num_64 = 0; 1497 if (class_data != NULL) { 1498 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1499 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1500 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1501 char c = descriptor[0]; 1502 if (c == 'L' || c == '[') { 1503 num_ref++; 1504 } else if (c == 'J' || c == 'D') { 1505 num_64++; 1506 } else { 1507 num_32++; 1508 } 1509 } 1510 } 1511 // start with generic class data 1512 uint32_t size = sizeof(mirror::Class); 1513 // follow with reference fields which must be contiguous at start 1514 size += (num_ref * sizeof(uint32_t)); 1515 // if there are 64-bit fields to add, make sure they are aligned 1516 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1517 if (num_32 != 0) { 1518 // use an available 32-bit field for padding 1519 num_32--; 1520 } 1521 size += sizeof(uint32_t); // either way, we are adding a word 1522 DCHECK_EQ(size, RoundUp(size, 8)); 1523 } 1524 // tack on any 64-bit fields now that alignment is assured 1525 size += (num_64 * sizeof(uint64_t)); 1526 // tack on any remaining 32-bit fields 1527 size += (num_32 * sizeof(uint32_t)); 1528 return size; 1529} 1530 1531OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1532 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1533 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1534 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1535 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1536 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1537 &dex_location_checksum); 1538 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1539 return oat_dex_file->GetOatClass(class_def_idx); 1540} 1541 1542static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1543 uint32_t method_idx) { 1544 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1545 const byte* class_data = dex_file.GetClassData(class_def); 1546 CHECK(class_data != NULL); 1547 ClassDataItemIterator it(dex_file, class_data); 1548 // Skip fields 1549 while (it.HasNextStaticField()) { 1550 it.Next(); 1551 } 1552 while (it.HasNextInstanceField()) { 1553 it.Next(); 1554 } 1555 // Process methods 1556 size_t class_def_method_index = 0; 1557 while (it.HasNextDirectMethod()) { 1558 if (it.GetMemberIndex() == method_idx) { 1559 return class_def_method_index; 1560 } 1561 class_def_method_index++; 1562 it.Next(); 1563 } 1564 while (it.HasNextVirtualMethod()) { 1565 if (it.GetMemberIndex() == method_idx) { 1566 return class_def_method_index; 1567 } 1568 class_def_method_index++; 1569 it.Next(); 1570 } 1571 DCHECK(!it.HasNext()); 1572 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1573 return 0; 1574} 1575 1576const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1577 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1578 // method for direct methods (or virtual methods made direct). 1579 mirror::Class* declaring_class = method->GetDeclaringClass(); 1580 size_t oat_method_index; 1581 if (method->IsStatic() || method->IsDirect()) { 1582 // Simple case where the oat method index was stashed at load time. 1583 oat_method_index = method->GetMethodIndex(); 1584 } else { 1585 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1586 // by search for its position in the declared virtual methods. 1587 oat_method_index = declaring_class->NumDirectMethods(); 1588 size_t end = declaring_class->NumVirtualMethods(); 1589 bool found = false; 1590 for (size_t i = 0; i < end; i++) { 1591 if (declaring_class->GetVirtualMethod(i) == method) { 1592 found = true; 1593 break; 1594 } 1595 oat_method_index++; 1596 } 1597 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1598 } 1599 DCHECK_EQ(oat_method_index, 1600 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1601 method->GetDeclaringClass()->GetDexClassDefIndex(), 1602 method->GetDexMethodIndex())); 1603 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1604 declaring_class->GetDexClassDefIndex()); 1605 1606 return oat_class.GetOatMethod(oat_method_index); 1607} 1608 1609// Special case to get oat code without overwriting a trampoline. 1610const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1611 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1612 if (method->IsProxyMethod()) { 1613 return GetQuickProxyInvokeHandler(); 1614 } 1615 const void* result = GetOatMethodFor(method).GetQuickCode(); 1616 if (result == nullptr) { 1617 if (method->IsNative()) { 1618 // No code and native? Use generic trampoline. 1619 result = GetQuickGenericJniTrampoline(); 1620 } else if (method->IsPortableCompiled()) { 1621 // No code? Do we expect portable code? 1622 result = GetQuickToPortableBridge(); 1623 } else { 1624 // No code? You must mean to go into the interpreter. 1625 result = GetQuickToInterpreterBridge(); 1626 } 1627 } 1628 return result; 1629} 1630 1631const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1632 bool* have_portable_code) { 1633 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1634 *have_portable_code = false; 1635 if (method->IsProxyMethod()) { 1636 return GetPortableProxyInvokeHandler(); 1637 } 1638 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1639 const void* result = oat_method.GetPortableCode(); 1640 if (result == nullptr) { 1641 if (oat_method.GetQuickCode() == nullptr) { 1642 // No code? You must mean to go into the interpreter. 1643 result = GetPortableToInterpreterBridge(); 1644 } else { 1645 // No code? But there's quick code, so use a bridge. 1646 result = GetPortableToQuickBridge(); 1647 } 1648 } else { 1649 *have_portable_code = true; 1650 } 1651 return result; 1652} 1653 1654const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1655 uint32_t method_idx) { 1656 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1657 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1658 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1659} 1660 1661const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1662 uint32_t method_idx) { 1663 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 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 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1707 ClassDataItemIterator it(dex_file, class_data); 1708 // Skip fields 1709 while (it.HasNextStaticField()) { 1710 it.Next(); 1711 } 1712 while (it.HasNextInstanceField()) { 1713 it.Next(); 1714 } 1715 // Link the code of methods skipped by LinkCode. 1716 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1717 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1718 if (!method->IsStatic()) { 1719 // Only update static methods. 1720 continue; 1721 } 1722 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1723 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1724 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1725 bool have_portable_code = false; 1726 if (enter_interpreter) { 1727 // Use interpreter entry point. 1728 // Check whether the method is native, in which case it's generic JNI. 1729 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1730 quick_code = GetQuickGenericJniTrampoline(); 1731 portable_code = GetPortableToQuickBridge(); 1732 } else { 1733 portable_code = GetPortableToInterpreterBridge(); 1734 quick_code = GetQuickToInterpreterBridge(); 1735 } 1736 } else { 1737 if (portable_code == nullptr) { 1738 portable_code = GetPortableToQuickBridge(); 1739 } else { 1740 have_portable_code = true; 1741 } 1742 if (quick_code == nullptr) { 1743 quick_code = GetQuickToPortableBridge(); 1744 } 1745 } 1746 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1747 have_portable_code); 1748 } 1749 // Ignore virtual methods on the iterator. 1750} 1751 1752static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1753 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1754 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1755 // Method shouldn't have already been linked. 1756 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1757 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1758 // Every kind of method should at least get an invoke stub from the oat_method. 1759 // non-abstract methods also get their code pointers. 1760 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1761 oat_method.LinkMethod(method.get()); 1762 1763 // Install entry point from interpreter. 1764 Runtime* runtime = Runtime::Current(); 1765 bool enter_interpreter = NeedsInterpreter(method.get(), 1766 method->GetEntryPointFromQuickCompiledCode(), 1767 method->GetEntryPointFromPortableCompiledCode()); 1768 if (enter_interpreter && !method->IsNative()) { 1769 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1770 } else { 1771 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1772 } 1773 1774 if (method->IsAbstract()) { 1775 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1776 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1777 return; 1778 } 1779 1780 bool have_portable_code = false; 1781 if (method->IsStatic() && !method->IsConstructor()) { 1782 // For static methods excluding the class initializer, install the trampoline. 1783 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1784 // after initializing class (see ClassLinker::InitializeClass method). 1785 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1786 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1787 } else if (enter_interpreter) { 1788 if (!method->IsNative()) { 1789 // Set entry point from compiled code if there's no code or in interpreter only mode. 1790 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1791 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1792 } else { 1793 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1794 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1795 } 1796 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1797 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1798 have_portable_code = true; 1799 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1800 } else { 1801 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1802 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1803 } 1804 1805 if (method->IsNative()) { 1806 // Unregistering restores the dlsym lookup stub. 1807 method->UnregisterNative(Thread::Current()); 1808 1809 if (enter_interpreter) { 1810 // We have a native method here without code. Then it should have either the GenericJni 1811 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1812 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1813 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1814 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1815 1816 DCHECK_EQ(method->GetFrameSizeInBytes<false>(), 0U); 1817 1818 // Fix up method metadata if necessary. 1819 uint32_t s_len; 1820 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_index), &s_len); 1821 uint32_t refs = 1; // Native method always has "this" or class. 1822 for (uint32_t i = 1; i < s_len; ++i) { 1823 if (shorty[i] == 'L') { 1824 refs++; 1825 } 1826 } 1827 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(refs); 1828 1829 // Get the generic spill masks and base frame size. 1830 mirror::ArtMethod* callee_save_method = 1831 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 1832 1833 method->SetFrameSizeInBytes(callee_save_method->GetFrameSizeInBytes() + sirt_size); 1834 method->SetCoreSpillMask(callee_save_method->GetCoreSpillMask()); 1835 method->SetFpSpillMask(callee_save_method->GetFpSpillMask()); 1836 } 1837 } 1838 1839 // Allow instrumentation its chance to hijack code. 1840 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1841 method->GetEntryPointFromQuickCompiledCode(), 1842 method->GetEntryPointFromPortableCompiledCode(), 1843 have_portable_code); 1844} 1845 1846void ClassLinker::LoadClass(const DexFile& dex_file, 1847 const DexFile::ClassDef& dex_class_def, 1848 const SirtRef<mirror::Class>& klass, 1849 mirror::ClassLoader* class_loader) { 1850 CHECK(klass.get() != NULL); 1851 CHECK(klass->GetDexCache() != NULL); 1852 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1853 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1854 CHECK(descriptor != NULL); 1855 1856 klass->SetClass(GetClassRoot(kJavaLangClass)); 1857 if (kUseBakerOrBrooksReadBarrier) { 1858 klass->AssertReadBarrierPointer(); 1859 } 1860 uint32_t access_flags = dex_class_def.access_flags_; 1861 // Make sure that none of our runtime-only flags are set. 1862 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1863 klass->SetAccessFlags(access_flags); 1864 klass->SetClassLoader(class_loader); 1865 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1866 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1867 1868 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1869 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1870 1871 const byte* class_data = dex_file.GetClassData(dex_class_def); 1872 if (class_data == NULL) { 1873 return; // no fields or methods - for example a marker interface 1874 } 1875 1876 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1877 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1878 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1879 } else { 1880 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1881 } 1882} 1883 1884void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1885 const byte* class_data, 1886 const SirtRef<mirror::Class>& klass, 1887 mirror::ClassLoader* class_loader, 1888 const OatFile::OatClass* oat_class) { 1889 // Load fields. 1890 ClassDataItemIterator it(dex_file, class_data); 1891 Thread* self = Thread::Current(); 1892 if (it.NumStaticFields() != 0) { 1893 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1894 if (UNLIKELY(statics == NULL)) { 1895 CHECK(self->IsExceptionPending()); // OOME. 1896 return; 1897 } 1898 klass->SetSFields(statics); 1899 } 1900 if (it.NumInstanceFields() != 0) { 1901 mirror::ObjectArray<mirror::ArtField>* fields = 1902 AllocArtFieldArray(self, it.NumInstanceFields()); 1903 if (UNLIKELY(fields == NULL)) { 1904 CHECK(self->IsExceptionPending()); // OOME. 1905 return; 1906 } 1907 klass->SetIFields(fields); 1908 } 1909 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1910 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1911 if (UNLIKELY(sfield.get() == NULL)) { 1912 CHECK(self->IsExceptionPending()); // OOME. 1913 return; 1914 } 1915 klass->SetStaticField(i, sfield.get()); 1916 LoadField(dex_file, it, klass, sfield); 1917 } 1918 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1919 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1920 if (UNLIKELY(ifield.get() == NULL)) { 1921 CHECK(self->IsExceptionPending()); // OOME. 1922 return; 1923 } 1924 klass->SetInstanceField(i, ifield.get()); 1925 LoadField(dex_file, it, klass, ifield); 1926 } 1927 1928 // Load methods. 1929 if (it.NumDirectMethods() != 0) { 1930 // TODO: append direct methods to class object 1931 mirror::ObjectArray<mirror::ArtMethod>* directs = 1932 AllocArtMethodArray(self, it.NumDirectMethods()); 1933 if (UNLIKELY(directs == NULL)) { 1934 CHECK(self->IsExceptionPending()); // OOME. 1935 return; 1936 } 1937 klass->SetDirectMethods(directs); 1938 } 1939 if (it.NumVirtualMethods() != 0) { 1940 // TODO: append direct methods to class object 1941 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1942 AllocArtMethodArray(self, it.NumVirtualMethods()); 1943 if (UNLIKELY(virtuals == NULL)) { 1944 CHECK(self->IsExceptionPending()); // OOME. 1945 return; 1946 } 1947 klass->SetVirtualMethods(virtuals); 1948 } 1949 size_t class_def_method_index = 0; 1950 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1951 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1952 if (UNLIKELY(method.get() == NULL)) { 1953 CHECK(self->IsExceptionPending()); // OOME. 1954 return; 1955 } 1956 klass->SetDirectMethod(i, method.get()); 1957 if (oat_class != nullptr) { 1958 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1959 } 1960 method->SetMethodIndex(class_def_method_index); 1961 class_def_method_index++; 1962 } 1963 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1964 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1965 if (UNLIKELY(method.get() == NULL)) { 1966 CHECK(self->IsExceptionPending()); // OOME. 1967 return; 1968 } 1969 klass->SetVirtualMethod(i, method.get()); 1970 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1971 if (oat_class != nullptr) { 1972 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1973 } 1974 class_def_method_index++; 1975 } 1976 DCHECK(!it.HasNext()); 1977} 1978 1979void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1980 const SirtRef<mirror::Class>& klass, 1981 const SirtRef<mirror::ArtField>& dst) { 1982 uint32_t field_idx = it.GetMemberIndex(); 1983 dst->SetDexFieldIndex(field_idx); 1984 dst->SetDeclaringClass(klass.get()); 1985 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1986} 1987 1988mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1989 const ClassDataItemIterator& it, 1990 const SirtRef<mirror::Class>& klass) { 1991 uint32_t dex_method_idx = it.GetMemberIndex(); 1992 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1993 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1994 1995 mirror::ArtMethod* dst = AllocArtMethod(self); 1996 if (UNLIKELY(dst == NULL)) { 1997 CHECK(self->IsExceptionPending()); // OOME. 1998 return NULL; 1999 } 2000 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2001 2002 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2003 dst->SetDexMethodIndex(dex_method_idx); 2004 dst->SetDeclaringClass(klass.get()); 2005 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2006 2007 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2008 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2009 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2010 2011 uint32_t access_flags = it.GetMemberAccessFlags(); 2012 2013 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2014 // Set finalizable flag on declaring class. 2015 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2016 // Void return type. 2017 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2018 klass->SetFinalizable(); 2019 } else { 2020 ClassHelper kh(klass.get()); 2021 const char* klass_descriptor = kh.GetDescriptor(); 2022 // The Enum class declares a "final" finalize() method to prevent subclasses from 2023 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2024 // subclasses, so we exclude it here. 2025 // We also want to avoid setting the flag on Object, where we know that finalize() is 2026 // empty. 2027 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2028 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2029 klass->SetFinalizable(); 2030 } 2031 } 2032 } 2033 } else if (method_name[0] == '<') { 2034 // Fix broken access flags for initializers. Bug 11157540. 2035 bool is_init = (strcmp("<init>", method_name) == 0); 2036 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2037 if (UNLIKELY(!is_init && !is_clinit)) { 2038 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2039 } else { 2040 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2041 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2042 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2043 access_flags |= kAccConstructor; 2044 } 2045 } 2046 } 2047 dst->SetAccessFlags(access_flags); 2048 2049 self->EndAssertNoThreadSuspension(old_cause); 2050 return dst; 2051} 2052 2053void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2054 Thread* self = Thread::Current(); 2055 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2056 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2057 AppendToBootClassPath(dex_file, dex_cache); 2058} 2059 2060void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2061 const SirtRef<mirror::DexCache>& dex_cache) { 2062 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2063 boot_class_path_.push_back(&dex_file); 2064 RegisterDexFile(dex_file, dex_cache); 2065} 2066 2067bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2068 dex_lock_.AssertSharedHeld(Thread::Current()); 2069 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2070 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2071 return true; 2072 } 2073 } 2074 return false; 2075} 2076 2077bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2078 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2079 return IsDexFileRegisteredLocked(dex_file); 2080} 2081 2082void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2083 const SirtRef<mirror::DexCache>& dex_cache) { 2084 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2085 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2086 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2087 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2088 dex_caches_.push_back(dex_cache.get()); 2089 dex_cache->SetDexFile(&dex_file); 2090 if (log_new_dex_caches_roots_) { 2091 // TODO: This is not safe if we can remove dex caches. 2092 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2093 } 2094} 2095 2096void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2097 Thread* self = Thread::Current(); 2098 { 2099 ReaderMutexLock mu(self, dex_lock_); 2100 if (IsDexFileRegisteredLocked(dex_file)) { 2101 return; 2102 } 2103 } 2104 // Don't alloc while holding the lock, since allocation may need to 2105 // suspend all threads and another thread may need the dex_lock_ to 2106 // get to a suspend point. 2107 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2108 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2109 { 2110 WriterMutexLock mu(self, dex_lock_); 2111 if (IsDexFileRegisteredLocked(dex_file)) { 2112 return; 2113 } 2114 RegisterDexFileLocked(dex_file, dex_cache); 2115 } 2116} 2117 2118void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2119 const SirtRef<mirror::DexCache>& dex_cache) { 2120 WriterMutexLock mu(Thread::Current(), dex_lock_); 2121 RegisterDexFileLocked(dex_file, dex_cache); 2122} 2123 2124mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2125 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2126 // Search assuming unique-ness of dex file. 2127 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2128 mirror::DexCache* dex_cache = dex_caches_[i]; 2129 if (dex_cache->GetDexFile() == &dex_file) { 2130 return dex_cache; 2131 } 2132 } 2133 // Search matching by location name. 2134 std::string location(dex_file.GetLocation()); 2135 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2136 mirror::DexCache* dex_cache = dex_caches_[i]; 2137 if (dex_cache->GetDexFile()->GetLocation() == location) { 2138 return dex_cache; 2139 } 2140 } 2141 // Failure, dump diagnostic and abort. 2142 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2143 mirror::DexCache* dex_cache = dex_caches_[i]; 2144 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2145 } 2146 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2147 return NULL; 2148} 2149 2150void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2151 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2152 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2153 dex_caches_[i]->Fixup(resolution_method); 2154 } 2155} 2156 2157mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2158 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2159 if (UNLIKELY(klass == NULL)) { 2160 return NULL; 2161 } 2162 return InitializePrimitiveClass(klass, type); 2163} 2164 2165mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2166 Primitive::Type type) { 2167 CHECK(primitive_class != NULL); 2168 // Must hold lock on object when initializing. 2169 Thread* self = Thread::Current(); 2170 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2171 ObjectLock<mirror::Class> lock(self, &sirt_class); 2172 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2173 primitive_class->SetPrimitiveType(type); 2174 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2175 const char* descriptor = Primitive::Descriptor(type); 2176 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2177 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2178 return primitive_class; 2179} 2180 2181// Create an array class (i.e. the class object for the array, not the 2182// array itself). "descriptor" looks like "[C" or "[[[[B" or 2183// "[Ljava/lang/String;". 2184// 2185// If "descriptor" refers to an array of primitives, look up the 2186// primitive type's internally-generated class object. 2187// 2188// "class_loader" is the class loader of the class that's referring to 2189// us. It's used to ensure that we're looking for the element type in 2190// the right context. It does NOT become the class loader for the 2191// array class; that always comes from the base element class. 2192// 2193// Returns NULL with an exception raised on failure. 2194mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2195 const SirtRef<mirror::ClassLoader>& class_loader) { 2196 // Identify the underlying component type 2197 CHECK_EQ('[', descriptor[0]); 2198 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2199 if (component_type.get() == nullptr) { 2200 DCHECK(self->IsExceptionPending()); 2201 return nullptr; 2202 } 2203 2204 // See if the component type is already loaded. Array classes are 2205 // always associated with the class loader of their underlying 2206 // element type -- an array of Strings goes with the loader for 2207 // java/lang/String -- so we need to look for it there. (The 2208 // caller should have checked for the existence of the class 2209 // before calling here, but they did so with *their* class loader, 2210 // not the component type's loader.) 2211 // 2212 // If we find it, the caller adds "loader" to the class' initiating 2213 // loader list, which should prevent us from going through this again. 2214 // 2215 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2216 // are the same, because our caller (FindClass) just did the 2217 // lookup. (Even if we get this wrong we still have correct behavior, 2218 // because we effectively do this lookup again when we add the new 2219 // class to the hash table --- necessary because of possible races with 2220 // other threads.) 2221 if (class_loader.get() != component_type->GetClassLoader()) { 2222 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2223 if (new_class != NULL) { 2224 return new_class; 2225 } 2226 } 2227 2228 // Fill out the fields in the Class. 2229 // 2230 // It is possible to execute some methods against arrays, because 2231 // all arrays are subclasses of java_lang_Object_, so we need to set 2232 // up a vtable. We can just point at the one in java_lang_Object_. 2233 // 2234 // Array classes are simple enough that we don't need to do a full 2235 // link step. 2236 SirtRef<mirror::Class> new_class(self, NULL); 2237 if (UNLIKELY(!init_done_)) { 2238 // Classes that were hand created, ie not by FindSystemClass 2239 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2240 new_class.reset(GetClassRoot(kClassArrayClass)); 2241 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2242 new_class.reset(GetClassRoot(kObjectArrayClass)); 2243 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2244 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2245 } else if (strcmp(descriptor, 2246 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2247 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2248 } else if (strcmp(descriptor, 2249 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2250 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2251 } else if (strcmp(descriptor, "[C") == 0) { 2252 new_class.reset(GetClassRoot(kCharArrayClass)); 2253 } else if (strcmp(descriptor, "[I") == 0) { 2254 new_class.reset(GetClassRoot(kIntArrayClass)); 2255 } 2256 } 2257 if (new_class.get() == nullptr) { 2258 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2259 if (new_class.get() == nullptr) { 2260 return nullptr; 2261 } 2262 new_class->SetComponentType(component_type.get()); 2263 } 2264 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2265 DCHECK(new_class->GetComponentType() != NULL); 2266 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2267 new_class->SetSuperClass(java_lang_Object); 2268 new_class->SetVTable(java_lang_Object->GetVTable()); 2269 new_class->SetPrimitiveType(Primitive::kPrimNot); 2270 new_class->SetClassLoader(component_type->GetClassLoader()); 2271 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2272 // don't need to set new_class->SetObjectSize(..) 2273 // because Object::SizeOf delegates to Array::SizeOf 2274 2275 2276 // All arrays have java/lang/Cloneable and java/io/Serializable as 2277 // interfaces. We need to set that up here, so that stuff like 2278 // "instanceof" works right. 2279 // 2280 // Note: The GC could run during the call to FindSystemClass, 2281 // so we need to make sure the class object is GC-valid while we're in 2282 // there. Do this by clearing the interface list so the GC will just 2283 // think that the entries are null. 2284 2285 2286 // Use the single, global copies of "interfaces" and "iftable" 2287 // (remember not to free them for arrays). 2288 CHECK(array_iftable_ != nullptr); 2289 new_class->SetIfTable(array_iftable_); 2290 2291 // Inherit access flags from the component type. 2292 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2293 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2294 access_flags &= kAccJavaFlagsMask; 2295 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2296 // and remove "interface". 2297 access_flags |= kAccAbstract | kAccFinal; 2298 access_flags &= ~kAccInterface; 2299 2300 new_class->SetAccessFlags(access_flags); 2301 2302 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2303 if (existing == nullptr) { 2304 return new_class.get(); 2305 } 2306 // Another thread must have loaded the class after we 2307 // started but before we finished. Abandon what we've 2308 // done. 2309 // 2310 // (Yes, this happens.) 2311 2312 return existing; 2313} 2314 2315mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2316 switch (type) { 2317 case 'B': 2318 return GetClassRoot(kPrimitiveByte); 2319 case 'C': 2320 return GetClassRoot(kPrimitiveChar); 2321 case 'D': 2322 return GetClassRoot(kPrimitiveDouble); 2323 case 'F': 2324 return GetClassRoot(kPrimitiveFloat); 2325 case 'I': 2326 return GetClassRoot(kPrimitiveInt); 2327 case 'J': 2328 return GetClassRoot(kPrimitiveLong); 2329 case 'S': 2330 return GetClassRoot(kPrimitiveShort); 2331 case 'Z': 2332 return GetClassRoot(kPrimitiveBoolean); 2333 case 'V': 2334 return GetClassRoot(kPrimitiveVoid); 2335 default: 2336 break; 2337 } 2338 std::string printable_type(PrintableChar(type)); 2339 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2340 return NULL; 2341} 2342 2343mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2344 size_t hash) { 2345 if (VLOG_IS_ON(class_linker)) { 2346 mirror::DexCache* dex_cache = klass->GetDexCache(); 2347 std::string source; 2348 if (dex_cache != NULL) { 2349 source += " from "; 2350 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2351 } 2352 LOG(INFO) << "Loaded class " << descriptor << source; 2353 } 2354 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2355 mirror::Class* existing = 2356 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2357 if (existing != NULL) { 2358 return existing; 2359 } 2360 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2361 // Check a class loaded with the system class loader matches one in the image if the class 2362 // is in the image. 2363 existing = LookupClassFromImage(descriptor); 2364 if (existing != NULL) { 2365 CHECK(klass == existing); 2366 } 2367 } 2368 VerifyObject(klass); 2369 class_table_.insert(std::make_pair(hash, klass)); 2370 if (log_new_class_table_roots_) { 2371 new_class_roots_.push_back(std::make_pair(hash, klass)); 2372 } 2373 return NULL; 2374} 2375 2376bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2377 size_t hash = Hash(descriptor); 2378 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2379 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2380 ++it) { 2381 mirror::Class* klass = it->second; 2382 ClassHelper kh(klass); 2383 if ((klass->GetClassLoader() == class_loader) && 2384 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2385 class_table_.erase(it); 2386 return true; 2387 } 2388 } 2389 return false; 2390} 2391 2392mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2393 const mirror::ClassLoader* class_loader) { 2394 size_t hash = Hash(descriptor); 2395 { 2396 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2397 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2398 if (result != NULL) { 2399 return result; 2400 } 2401 } 2402 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2403 return NULL; 2404 } else { 2405 // Lookup failed but need to search dex_caches_. 2406 mirror::Class* result = LookupClassFromImage(descriptor); 2407 if (result != NULL) { 2408 InsertClass(descriptor, result, hash); 2409 } else { 2410 // Searching the image dex files/caches failed, we don't want to get into this situation 2411 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2412 // classes into the class table. 2413 const int32_t kMaxFailedDexCacheLookups = 1000; 2414 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2415 MoveImageClassesToClassTable(); 2416 } 2417 } 2418 return result; 2419 } 2420} 2421 2422mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2423 const mirror::ClassLoader* class_loader, 2424 size_t hash) { 2425 auto end = class_table_.end(); 2426 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2427 mirror::Class* klass = it->second; 2428 ClassHelper kh(klass); 2429 if ((klass->GetClassLoader() == class_loader) && 2430 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2431 if (kIsDebugBuild) { 2432 // Check for duplicates in the table. 2433 for (++it; it != end && it->first == hash; ++it) { 2434 mirror::Class* klass2 = it->second; 2435 ClassHelper kh(klass2); 2436 CHECK(!((klass2->GetClassLoader() == class_loader) && 2437 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2438 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2439 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2440 } 2441 } 2442 return klass; 2443 } 2444 } 2445 return NULL; 2446} 2447 2448static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2449 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2450 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2451 CHECK(image != NULL); 2452 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2453 return root->AsObjectArray<mirror::DexCache>(); 2454} 2455 2456void ClassLinker::MoveImageClassesToClassTable() { 2457 Thread* self = Thread::Current(); 2458 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2459 if (!dex_cache_image_class_lookup_required_) { 2460 return; // All dex cache classes are already in the class table. 2461 } 2462 const char* old_no_suspend_cause = 2463 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2464 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2465 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2466 mirror::DexCache* dex_cache = dex_caches->Get(i); 2467 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2468 for (int32_t j = 0; j < types->GetLength(); j++) { 2469 mirror::Class* klass = types->Get(j); 2470 if (klass != NULL) { 2471 ClassHelper kh(klass); 2472 DCHECK(klass->GetClassLoader() == NULL); 2473 const char* descriptor = kh.GetDescriptor(); 2474 size_t hash = Hash(descriptor); 2475 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2476 if (existing != NULL) { 2477 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2478 << PrettyClassAndClassLoader(klass); 2479 } else { 2480 class_table_.insert(std::make_pair(hash, klass)); 2481 if (log_new_class_table_roots_) { 2482 new_class_roots_.push_back(std::make_pair(hash, klass)); 2483 } 2484 } 2485 } 2486 } 2487 } 2488 dex_cache_image_class_lookup_required_ = false; 2489 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2490} 2491 2492mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2493 Thread* self = Thread::Current(); 2494 const char* old_no_suspend_cause = 2495 self->StartAssertNoThreadSuspension("Image class lookup"); 2496 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2497 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2498 mirror::DexCache* dex_cache = dex_caches->Get(i); 2499 const DexFile* dex_file = dex_cache->GetDexFile(); 2500 // Try binary searching the string/type index. 2501 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2502 if (string_id != NULL) { 2503 const DexFile::TypeId* type_id = 2504 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2505 if (type_id != NULL) { 2506 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2507 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2508 if (klass != NULL) { 2509 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2510 return klass; 2511 } 2512 } 2513 } 2514 } 2515 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2516 return NULL; 2517} 2518 2519void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2520 result.clear(); 2521 if (dex_cache_image_class_lookup_required_) { 2522 MoveImageClassesToClassTable(); 2523 } 2524 size_t hash = Hash(descriptor); 2525 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2526 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2527 it != end && it->first == hash; ++it) { 2528 mirror::Class* klass = it->second; 2529 ClassHelper kh(klass); 2530 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2531 result.push_back(klass); 2532 } 2533 } 2534} 2535 2536void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2537 // TODO: assert that the monitor on the Class is held 2538 Thread* self = Thread::Current(); 2539 ObjectLock<mirror::Class> lock(self, &klass); 2540 2541 // Don't attempt to re-verify if already sufficiently verified. 2542 if (klass->IsVerified() || 2543 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2544 return; 2545 } 2546 2547 // The class might already be erroneous, for example at compile time if we attempted to verify 2548 // this class as a parent to another. 2549 if (klass->IsErroneous()) { 2550 ThrowEarlierClassFailure(klass.get()); 2551 return; 2552 } 2553 2554 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2555 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2556 } else { 2557 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2558 << PrettyClass(klass.get()); 2559 CHECK(!Runtime::Current()->IsCompiler()); 2560 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2561 } 2562 2563 // Skip verification if disabled. 2564 if (!Runtime::Current()->IsVerificationEnabled()) { 2565 klass->SetStatus(mirror::Class::kStatusVerified, self); 2566 return; 2567 } 2568 2569 // Verify super class. 2570 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2571 if (super.get() != NULL) { 2572 // Acquire lock to prevent races on verifying the super class. 2573 ObjectLock<mirror::Class> lock(self, &super); 2574 2575 if (!super->IsVerified() && !super->IsErroneous()) { 2576 VerifyClass(super); 2577 } 2578 if (!super->IsCompileTimeVerified()) { 2579 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2580 PrettyDescriptor(klass.get()).c_str(), 2581 PrettyDescriptor(super.get()).c_str())); 2582 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2583 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2584 if (cause.get() != nullptr) { 2585 self->ClearException(); 2586 } 2587 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2588 if (cause.get() != nullptr) { 2589 self->GetException(nullptr)->SetCause(cause.get()); 2590 } 2591 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2592 if (Runtime::Current()->IsCompiler()) { 2593 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2594 } 2595 klass->SetStatus(mirror::Class::kStatusError, self); 2596 return; 2597 } 2598 } 2599 2600 // Try to use verification information from the oat file, otherwise do runtime verification. 2601 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2602 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2603 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2604 if (oat_file_class_status == mirror::Class::kStatusError) { 2605 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2606 << PrettyDescriptor(klass.get()) << " in " 2607 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2608 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2609 PrettyDescriptor(klass.get()).c_str()); 2610 klass->SetStatus(mirror::Class::kStatusError, self); 2611 return; 2612 } 2613 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2614 std::string error_msg; 2615 if (!preverified) { 2616 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2617 Runtime::Current()->IsCompiler(), 2618 &error_msg); 2619 } 2620 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2621 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2622 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2623 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2624 << " because: " << error_msg; 2625 } 2626 self->AssertNoPendingException(); 2627 // Make sure all classes referenced by catch blocks are resolved. 2628 ResolveClassExceptionHandlerTypes(dex_file, klass); 2629 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2630 // Even though there were no verifier failures we need to respect whether the super-class 2631 // was verified or requiring runtime reverification. 2632 if (super.get() == NULL || super->IsVerified()) { 2633 klass->SetStatus(mirror::Class::kStatusVerified, self); 2634 } else { 2635 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2636 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2637 // Pretend a soft failure occured so that we don't consider the class verified below. 2638 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2639 } 2640 } else { 2641 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2642 // Soft failures at compile time should be retried at runtime. Soft 2643 // failures at runtime will be handled by slow paths in the generated 2644 // code. Set status accordingly. 2645 if (Runtime::Current()->IsCompiler()) { 2646 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2647 } else { 2648 klass->SetStatus(mirror::Class::kStatusVerified, self); 2649 } 2650 } 2651 } else { 2652 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2653 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2654 << " because: " << error_msg; 2655 self->AssertNoPendingException(); 2656 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2657 klass->SetStatus(mirror::Class::kStatusError, self); 2658 } 2659 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2660 // Class is verified so we don't need to do any access check on its methods. 2661 // Let the interpreter know it by setting the kAccPreverified flag onto each 2662 // method. 2663 // Note: we're going here during compilation and at runtime. When we set the 2664 // kAccPreverified flag when compiling image classes, the flag is recorded 2665 // in the image and is set when loading the image. 2666 klass->SetPreverifiedFlagOnAllMethods(); 2667 } 2668} 2669 2670bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2671 mirror::Class::Status& oat_file_class_status) { 2672 // If we're compiling, we can only verify the class using the oat file if 2673 // we are not compiling the image or if the class we're verifying is not part of 2674 // the app. In other words, we will only check for preverification of bootclasspath 2675 // classes. 2676 if (Runtime::Current()->IsCompiler()) { 2677 // Are we compiling the bootclasspath? 2678 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2679 return false; 2680 } 2681 // We are compiling an app (not the image). 2682 2683 // Is this an app class? (I.e. not a bootclasspath class) 2684 if (klass->GetClassLoader() != NULL) { 2685 return false; 2686 } 2687 } 2688 2689 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2690 // Make this work with gtests, which do not set up the image properly. 2691 // TODO: we should clean up gtests to set up the image path properly. 2692 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2693 return false; 2694 } 2695 2696 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2697 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2699 &dex_location_checksum); 2700 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2701 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2702 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2703 if (oat_file_class_status == mirror::Class::kStatusVerified || 2704 oat_file_class_status == mirror::Class::kStatusInitialized) { 2705 return true; 2706 } 2707 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2708 // Compile time verification failed with a soft error. Compile time verification can fail 2709 // because we have incomplete type information. Consider the following: 2710 // class ... { 2711 // Foo x; 2712 // .... () { 2713 // if (...) { 2714 // v1 gets assigned a type of resolved class Foo 2715 // } else { 2716 // v1 gets assigned a type of unresolved class Bar 2717 // } 2718 // iput x = v1 2719 // } } 2720 // when we merge v1 following the if-the-else it results in Conflict 2721 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2722 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2723 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2724 // at compile time). 2725 return false; 2726 } 2727 if (oat_file_class_status == mirror::Class::kStatusError) { 2728 // Compile time verification failed with a hard error. This is caused by invalid instructions 2729 // in the class. These errors are unrecoverable. 2730 return false; 2731 } 2732 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2733 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2734 // not loading the class. 2735 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2736 // isn't a problem and this case shouldn't occur 2737 return false; 2738 } 2739 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2740 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2741 << ClassHelper(klass).GetDescriptor(); 2742 2743 return false; 2744} 2745 2746void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2747 const SirtRef<mirror::Class>& klass) { 2748 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2749 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2750 } 2751 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2752 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2753 } 2754} 2755 2756void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2757 mirror::ArtMethod* method) { 2758 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2759 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2760 if (code_item == NULL) { 2761 return; // native or abstract method 2762 } 2763 if (code_item->tries_size_ == 0) { 2764 return; // nothing to process 2765 } 2766 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2767 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2768 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2769 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2770 CatchHandlerIterator iterator(handlers_ptr); 2771 for (; iterator.HasNext(); iterator.Next()) { 2772 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2773 // unresolved exception types will be ignored by exception delivery 2774 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2775 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2776 if (exception_type == NULL) { 2777 DCHECK(Thread::Current()->IsExceptionPending()); 2778 Thread::Current()->ClearException(); 2779 } 2780 } 2781 } 2782 handlers_ptr = iterator.EndDataPointer(); 2783 } 2784} 2785 2786static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2787static void CheckProxyMethod(mirror::ArtMethod* method, 2788 SirtRef<mirror::ArtMethod>& prototype); 2789 2790mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2791 jobjectArray interfaces, jobject loader, 2792 jobjectArray methods, jobjectArray throws) { 2793 Thread* self = soa.Self(); 2794 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2795 sizeof(mirror::SynthesizedProxyClass))); 2796 if (klass.get() == NULL) { 2797 CHECK(self->IsExceptionPending()); // OOME. 2798 return NULL; 2799 } 2800 DCHECK(klass->GetClass() != NULL); 2801 klass->SetObjectSize(sizeof(mirror::Proxy)); 2802 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2803 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2804 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2805 klass->SetName(soa.Decode<mirror::String*>(name)); 2806 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2807 klass->SetDexCache(proxy_class->GetDexCache()); 2808 klass->SetStatus(mirror::Class::kStatusIdx, self); 2809 2810 // Instance fields are inherited, but we add a couple of static fields... 2811 { 2812 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2813 if (UNLIKELY(sfields == NULL)) { 2814 CHECK(self->IsExceptionPending()); // OOME. 2815 return NULL; 2816 } 2817 klass->SetSFields(sfields); 2818 } 2819 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2820 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2821 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2822 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2823 CHECK(self->IsExceptionPending()); // OOME. 2824 return NULL; 2825 } 2826 klass->SetStaticField(0, interfaces_sfield.get()); 2827 interfaces_sfield->SetDexFieldIndex(0); 2828 interfaces_sfield->SetDeclaringClass(klass.get()); 2829 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2830 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2831 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2832 if (UNLIKELY(throws_sfield.get() == NULL)) { 2833 CHECK(self->IsExceptionPending()); // OOME. 2834 return NULL; 2835 } 2836 klass->SetStaticField(1, throws_sfield.get()); 2837 throws_sfield->SetDexFieldIndex(1); 2838 throws_sfield->SetDeclaringClass(klass.get()); 2839 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2840 2841 // Proxies have 1 direct method, the constructor 2842 { 2843 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2844 if (UNLIKELY(directs == NULL)) { 2845 CHECK(self->IsExceptionPending()); // OOME. 2846 return NULL; 2847 } 2848 klass->SetDirectMethods(directs); 2849 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2850 if (UNLIKELY(constructor == NULL)) { 2851 CHECK(self->IsExceptionPending()); // OOME. 2852 return NULL; 2853 } 2854 klass->SetDirectMethod(0, constructor); 2855 } 2856 2857 // Create virtual method using specified prototypes. 2858 size_t num_virtual_methods = 2859 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2860 { 2861 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2862 if (UNLIKELY(virtuals == NULL)) { 2863 CHECK(self->IsExceptionPending()); // OOME. 2864 return NULL; 2865 } 2866 klass->SetVirtualMethods(virtuals); 2867 } 2868 for (size_t i = 0; i < num_virtual_methods; ++i) { 2869 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2870 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2871 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2872 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2873 if (UNLIKELY(clone == NULL)) { 2874 CHECK(self->IsExceptionPending()); // OOME. 2875 return NULL; 2876 } 2877 klass->SetVirtualMethod(i, clone); 2878 } 2879 2880 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2881 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2882 self->AssertNoPendingException(); 2883 2884 { 2885 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2886 // Link the fields and virtual methods, creating vtable and iftables 2887 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2888 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2889 if (!LinkClass(self, klass, sirt_interfaces)) { 2890 klass->SetStatus(mirror::Class::kStatusError, self); 2891 return nullptr; 2892 } 2893 2894 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2895 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2896 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2897 } 2898 2899 // sanity checks 2900 if (kIsDebugBuild) { 2901 CHECK(klass->GetIFields() == NULL); 2902 CheckProxyConstructor(klass->GetDirectMethod(0)); 2903 for (size_t i = 0; i < num_virtual_methods; ++i) { 2904 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2905 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2906 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2907 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2908 } 2909 2910 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2911 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2912 decoded_name->ToModifiedUtf8().c_str())); 2913 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2914 2915 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2916 decoded_name->ToModifiedUtf8().c_str())); 2917 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2918 2919 mirror::SynthesizedProxyClass* synth_proxy_class = 2920 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2921 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2922 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2923 } 2924 std::string descriptor(GetDescriptorForProxy(klass.get())); 2925 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2926 CHECK(existing == nullptr); 2927 return klass.get(); 2928} 2929 2930std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2931 DCHECK(proxy_class->IsProxyClass()); 2932 mirror::String* name = proxy_class->GetName(); 2933 DCHECK(name != NULL); 2934 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2935} 2936 2937mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2938 mirror::ArtMethod* proxy_method) { 2939 DCHECK(proxy_class->IsProxyClass()); 2940 DCHECK(proxy_method->IsProxyMethod()); 2941 // Locate the dex cache of the original interface/Object 2942 mirror::DexCache* dex_cache = NULL; 2943 { 2944 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2945 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2946 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2947 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2948 dex_cache = dex_caches_[i]; 2949 break; 2950 } 2951 } 2952 } 2953 CHECK(dex_cache != NULL); 2954 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2955 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2956 CHECK(resolved_method != NULL); 2957 return resolved_method; 2958} 2959 2960 2961mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2962 const SirtRef<mirror::Class>& klass, 2963 mirror::Class* proxy_class) { 2964 // Create constructor for Proxy that must initialize h 2965 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2966 proxy_class->GetDirectMethods(); 2967 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2968 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2969 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2970 // code_ too) 2971 mirror::ArtMethod* constructor = 2972 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2973 if (constructor == NULL) { 2974 CHECK(self->IsExceptionPending()); // OOME. 2975 return NULL; 2976 } 2977 // Make this constructor public and fix the class to be our Proxy version 2978 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2979 constructor->SetDeclaringClass(klass.get()); 2980 return constructor; 2981} 2982 2983static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2984 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2985 CHECK(constructor->IsConstructor()); 2986 MethodHelper mh(constructor); 2987 CHECK_STREQ(mh.GetName(), "<init>"); 2988 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2989 DCHECK(constructor->IsPublic()); 2990} 2991 2992mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2993 const SirtRef<mirror::Class>& klass, 2994 const SirtRef<mirror::ArtMethod>& prototype) { 2995 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2996 // prototype method 2997 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2998 prototype.get()); 2999 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3000 // as necessary 3001 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3002 if (UNLIKELY(method == NULL)) { 3003 CHECK(self->IsExceptionPending()); // OOME. 3004 return NULL; 3005 } 3006 3007 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3008 // the intersection of throw exceptions as defined in Proxy 3009 method->SetDeclaringClass(klass.get()); 3010 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3011 3012 // At runtime the method looks like a reference and argument saving method, clone the code 3013 // related parameters from this method. 3014 mirror::ArtMethod* refs_and_args = 3015 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 3016 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 3017 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 3018 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 3019 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3020 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3021 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3022 3023 return method; 3024} 3025 3026static void CheckProxyMethod(mirror::ArtMethod* method, 3027 SirtRef<mirror::ArtMethod>& prototype) 3028 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3029 // Basic sanity 3030 CHECK(!prototype->IsFinal()); 3031 CHECK(method->IsFinal()); 3032 CHECK(!method->IsAbstract()); 3033 3034 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3035 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3036 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3037 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3038 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3039 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3040 3041 MethodHelper mh(method); 3042 MethodHelper mh2(prototype.get()); 3043 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3044 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3045 // More complex sanity - via dex cache 3046 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3047} 3048 3049static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3050 bool can_init_parents) 3051 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3052 if (can_init_statics && can_init_parents) { 3053 return true; 3054 } 3055 if (!can_init_statics) { 3056 // Check if there's a class initializer. 3057 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3058 if (clinit != NULL) { 3059 return false; 3060 } 3061 // Check if there are encoded static values needing initialization. 3062 if (klass->NumStaticFields() != 0) { 3063 ClassHelper kh(klass); 3064 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3065 DCHECK(dex_class_def != NULL); 3066 if (dex_class_def->static_values_off_ != 0) { 3067 return false; 3068 } 3069 } 3070 } 3071 if (!klass->IsInterface() && klass->HasSuperClass()) { 3072 mirror::Class* super_class = klass->GetSuperClass(); 3073 if (!can_init_parents && !super_class->IsInitialized()) { 3074 return false; 3075 } else { 3076 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3077 return false; 3078 } 3079 } 3080 } 3081 return true; 3082} 3083 3084bool ClassLinker::IsInitialized() const { 3085 return init_done_; 3086} 3087 3088bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3089 bool can_init_parents) { 3090 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3091 3092 // Are we already initialized and therefore done? 3093 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3094 // an initialized class will never change its state. 3095 if (klass->IsInitialized()) { 3096 return true; 3097 } 3098 3099 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3100 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3101 return false; 3102 } 3103 3104 Thread* self = Thread::Current(); 3105 uint64_t t0; 3106 { 3107 ObjectLock<mirror::Class> lock(self, &klass); 3108 3109 // Re-check under the lock in case another thread initialized ahead of us. 3110 if (klass->IsInitialized()) { 3111 return true; 3112 } 3113 3114 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3115 if (klass->IsErroneous()) { 3116 ThrowEarlierClassFailure(klass.get()); 3117 return false; 3118 } 3119 3120 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3121 3122 if (!klass->IsVerified()) { 3123 VerifyClass(klass); 3124 if (!klass->IsVerified()) { 3125 // We failed to verify, expect either the klass to be erroneous or verification failed at 3126 // compile time. 3127 if (klass->IsErroneous()) { 3128 CHECK(self->IsExceptionPending()); 3129 } else { 3130 CHECK(Runtime::Current()->IsCompiler()); 3131 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3132 } 3133 return false; 3134 } 3135 } 3136 3137 // If the class is kStatusInitializing, either this thread is 3138 // initializing higher up the stack or another thread has beat us 3139 // to initializing and we need to wait. Either way, this 3140 // invocation of InitializeClass will not be responsible for 3141 // running <clinit> and will return. 3142 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3143 // We caught somebody else in the act; was it us? 3144 if (klass->GetClinitThreadId() == self->GetTid()) { 3145 // Yes. That's fine. Return so we can continue initializing. 3146 return true; 3147 } 3148 // No. That's fine. Wait for another thread to finish initializing. 3149 return WaitForInitializeClass(klass, self, lock); 3150 } 3151 3152 if (!ValidateSuperClassDescriptors(klass)) { 3153 klass->SetStatus(mirror::Class::kStatusError, self); 3154 return false; 3155 } 3156 3157 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3158 3159 // From here out other threads may observe that we're initializing and so changes of state 3160 // require the a notification. 3161 klass->SetClinitThreadId(self->GetTid()); 3162 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3163 3164 t0 = NanoTime(); 3165 } 3166 3167 // Initialize super classes, must be done while initializing for the JLS. 3168 if (!klass->IsInterface() && klass->HasSuperClass()) { 3169 mirror::Class* super_class = klass->GetSuperClass(); 3170 if (!super_class->IsInitialized()) { 3171 CHECK(!super_class->IsInterface()); 3172 CHECK(can_init_parents); 3173 SirtRef<mirror::Class> sirt_super(self, super_class); 3174 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3175 if (!super_initialized) { 3176 // The super class was verified ahead of entering initializing, we should only be here if 3177 // the super class became erroneous due to initialization. 3178 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3179 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3180 << " that has unexpected status " << sirt_super->GetStatus() 3181 << "\nPending exception:\n" 3182 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3183 ObjectLock<mirror::Class> lock(self, &klass); 3184 // Initialization failed because the super-class is erroneous. 3185 klass->SetStatus(mirror::Class::kStatusError, self); 3186 return false; 3187 } 3188 } 3189 } 3190 3191 if (klass->NumStaticFields() > 0) { 3192 ClassHelper kh(klass.get()); 3193 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3194 CHECK(dex_class_def != NULL); 3195 const DexFile& dex_file = kh.GetDexFile(); 3196 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3197 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3198 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3199 this, *dex_class_def); 3200 if (it.HasNext()) { 3201 CHECK(can_init_statics); 3202 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3203 SafeMap<uint32_t, mirror::ArtField*> field_map; 3204 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3205 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3206 if (Runtime::Current()->IsActiveTransaction()) { 3207 it.ReadValueToField<true>(field_map.Get(i)); 3208 } else { 3209 it.ReadValueToField<false>(field_map.Get(i)); 3210 } 3211 } 3212 } 3213 } 3214 3215 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3216 if (clinit != NULL) { 3217 CHECK(can_init_statics); 3218 if (LIKELY(Runtime::Current()->IsStarted())) { 3219 JValue result; 3220 clinit->Invoke(self, NULL, 0, &result, "V"); 3221 } else { 3222 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3223 } 3224 } 3225 3226 uint64_t t1 = NanoTime(); 3227 3228 bool success = true; 3229 { 3230 ObjectLock<mirror::Class> lock(self, &klass); 3231 3232 if (self->IsExceptionPending()) { 3233 WrapExceptionInInitializer(); 3234 klass->SetStatus(mirror::Class::kStatusError, self); 3235 success = false; 3236 } else { 3237 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3238 RuntimeStats* thread_stats = self->GetStats(); 3239 ++global_stats->class_init_count; 3240 ++thread_stats->class_init_count; 3241 global_stats->class_init_time_ns += (t1 - t0); 3242 thread_stats->class_init_time_ns += (t1 - t0); 3243 // Set the class as initialized except if failed to initialize static fields. 3244 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3245 if (VLOG_IS_ON(class_linker)) { 3246 ClassHelper kh(klass.get()); 3247 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3248 } 3249 // Opportunistically set static method trampolines to their destination. 3250 FixupStaticTrampolines(klass.get()); 3251 } 3252 } 3253 return success; 3254} 3255 3256bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3257 ObjectLock<mirror::Class>& lock) 3258 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3259 while (true) { 3260 self->AssertNoPendingException(); 3261 CHECK(!klass->IsInitialized()); 3262 lock.WaitIgnoringInterrupts(); 3263 3264 // When we wake up, repeat the test for init-in-progress. If 3265 // there's an exception pending (only possible if 3266 // "interruptShouldThrow" was set), bail out. 3267 if (self->IsExceptionPending()) { 3268 WrapExceptionInInitializer(); 3269 klass->SetStatus(mirror::Class::kStatusError, self); 3270 return false; 3271 } 3272 // Spurious wakeup? Go back to waiting. 3273 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3274 continue; 3275 } 3276 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3277 // Compile time initialization failed. 3278 return false; 3279 } 3280 if (klass->IsErroneous()) { 3281 // The caller wants an exception, but it was thrown in a 3282 // different thread. Synthesize one here. 3283 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3284 PrettyDescriptor(klass.get()).c_str()); 3285 return false; 3286 } 3287 if (klass->IsInitialized()) { 3288 return true; 3289 } 3290 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3291 << klass->GetStatus(); 3292 } 3293 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3294} 3295 3296bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3297 if (klass->IsInterface()) { 3298 return true; 3299 } 3300 Thread* self = Thread::Current(); 3301 // begin with the methods local to the superclass 3302 if (klass->HasSuperClass() && 3303 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3304 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3305 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3306 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3307 if (method != super->GetVTable()->Get(i) && 3308 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3309 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3310 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3311 PrettyDescriptor(super.get()).c_str()); 3312 return false; 3313 } 3314 } 3315 } 3316 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3317 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3318 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3319 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3320 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3321 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3322 method->GetDeclaringClass())) { 3323 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3324 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3325 PrettyMethod(method).c_str(), 3326 PrettyDescriptor(interface.get()).c_str()); 3327 return false; 3328 } 3329 } 3330 } 3331 } 3332 return true; 3333} 3334 3335// Returns true if classes referenced by the signature of the method are the 3336// same classes in klass1 as they are in klass2. 3337bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3338 mirror::ArtMethod* method, 3339 mirror::Class* klass1, 3340 mirror::Class* klass2) { 3341 if (klass1 == klass2) { 3342 return true; 3343 } 3344 CHECK(klass1 != nullptr); 3345 CHECK(klass2 != nullptr); 3346 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3347 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3348 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3349 const DexFile::ProtoId& proto_id = 3350 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3351 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3352 const char* descriptor = it.GetDescriptor(); 3353 if (descriptor == nullptr) { 3354 break; 3355 } 3356 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3357 // Found a non-primitive type. 3358 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3359 return false; 3360 } 3361 } 3362 } 3363 // Check the return type 3364 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3365 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3366 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3367 return false; 3368 } 3369 } 3370 return true; 3371} 3372 3373// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3374bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3375 SirtRef<mirror::ClassLoader>& loader1, 3376 SirtRef<mirror::ClassLoader>& loader2) { 3377 CHECK(descriptor != nullptr); 3378 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3379 if (found1.get() == nullptr) { 3380 self->ClearException(); 3381 } 3382 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3383 if (found2 == nullptr) { 3384 self->ClearException(); 3385 } 3386 return found1.get() == found2; 3387} 3388 3389bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3390 bool can_init_parents) { 3391 DCHECK(c.get() != NULL); 3392 if (c->IsInitialized()) { 3393 return true; 3394 } 3395 3396 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3397 if (!success) { 3398 if (can_init_fields && can_init_parents) { 3399 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3400 } 3401 } 3402 return success; 3403} 3404 3405void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3406 mirror::Class* c, 3407 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3408 const byte* class_data = dex_file.GetClassData(dex_class_def); 3409 ClassDataItemIterator it(dex_file, class_data); 3410 Thread* self = Thread::Current(); 3411 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3412 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3413 CHECK(!kMovingFields); 3414 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3415 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3416 } 3417} 3418 3419bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3420 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3421 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3422 if (!LinkSuperClass(klass)) { 3423 return false; 3424 } 3425 if (!LinkMethods(klass, interfaces)) { 3426 return false; 3427 } 3428 if (!LinkInstanceFields(klass)) { 3429 return false; 3430 } 3431 if (!LinkStaticFields(klass)) { 3432 return false; 3433 } 3434 CreateReferenceInstanceOffsets(klass); 3435 CreateReferenceStaticOffsets(klass); 3436 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3437 klass->SetStatus(mirror::Class::kStatusResolved, self); 3438 return true; 3439} 3440 3441bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3442 const DexFile& dex_file) { 3443 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3444 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3445 uint16_t super_class_idx = class_def.superclass_idx_; 3446 if (super_class_idx != DexFile::kDexNoIndex16) { 3447 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3448 if (super_class == NULL) { 3449 DCHECK(Thread::Current()->IsExceptionPending()); 3450 return false; 3451 } 3452 // Verify 3453 if (!klass->CanAccess(super_class)) { 3454 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3455 PrettyDescriptor(super_class).c_str(), 3456 PrettyDescriptor(klass.get()).c_str()); 3457 return false; 3458 } 3459 klass->SetSuperClass(super_class); 3460 } 3461 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3462 if (interfaces != NULL) { 3463 for (size_t i = 0; i < interfaces->Size(); i++) { 3464 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3465 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3466 if (interface == NULL) { 3467 DCHECK(Thread::Current()->IsExceptionPending()); 3468 return false; 3469 } 3470 // Verify 3471 if (!klass->CanAccess(interface)) { 3472 // TODO: the RI seemed to ignore this in my testing. 3473 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3474 PrettyDescriptor(interface).c_str(), 3475 PrettyDescriptor(klass.get()).c_str()); 3476 return false; 3477 } 3478 } 3479 } 3480 // Mark the class as loaded. 3481 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3482 return true; 3483} 3484 3485bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3486 CHECK(!klass->IsPrimitive()); 3487 mirror::Class* super = klass->GetSuperClass(); 3488 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3489 if (super != NULL) { 3490 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3491 return false; 3492 } 3493 return true; 3494 } 3495 if (super == NULL) { 3496 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3497 PrettyDescriptor(klass.get()).c_str()); 3498 return false; 3499 } 3500 // Verify 3501 if (super->IsFinal() || super->IsInterface()) { 3502 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3503 PrettyDescriptor(super).c_str(), 3504 PrettyDescriptor(klass.get()).c_str(), 3505 super->IsFinal() ? "declared final" : "an interface"); 3506 return false; 3507 } 3508 if (!klass->CanAccess(super)) { 3509 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3510 PrettyDescriptor(super).c_str(), 3511 PrettyDescriptor(klass.get()).c_str()); 3512 return false; 3513 } 3514 3515 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3516 if (super->IsFinalizable()) { 3517 klass->SetFinalizable(); 3518 } 3519 3520 // Inherit reference flags (if any) from the superclass. 3521 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3522 if (reference_flags != 0) { 3523 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3524 } 3525 // Disallow custom direct subclasses of java.lang.ref.Reference. 3526 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3527 ThrowLinkageError(klass.get(), 3528 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3529 PrettyDescriptor(klass.get()).c_str()); 3530 return false; 3531 } 3532 3533 if (kIsDebugBuild) { 3534 // Ensure super classes are fully resolved prior to resolving fields.. 3535 while (super != NULL) { 3536 CHECK(super->IsResolved()); 3537 super = super->GetSuperClass(); 3538 } 3539 } 3540 return true; 3541} 3542 3543// Populate the class vtable and itable. Compute return type indices. 3544bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3545 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3546 if (klass->IsInterface()) { 3547 // No vtable. 3548 size_t count = klass->NumVirtualMethods(); 3549 if (!IsUint(16, count)) { 3550 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3551 return false; 3552 } 3553 for (size_t i = 0; i < count; ++i) { 3554 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3555 } 3556 // Link interface method tables 3557 return LinkInterfaceMethods(klass, interfaces); 3558 } else { 3559 // Link virtual and interface method tables 3560 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3561 } 3562 return true; 3563} 3564 3565bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3566 Thread* self = Thread::Current(); 3567 if (klass->HasSuperClass()) { 3568 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3569 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3570 CHECK_LE(actual_count, max_count); 3571 // TODO: do not assign to the vtable field until it is fully constructed. 3572 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3573 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3574 if (UNLIKELY(vtable.get() == NULL)) { 3575 CHECK(self->IsExceptionPending()); // OOME. 3576 return false; 3577 } 3578 // See if any of our virtual methods override the superclass. 3579 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3580 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3581 MethodHelper local_mh(local_method); 3582 size_t j = 0; 3583 for (; j < actual_count; ++j) { 3584 mirror::ArtMethod* super_method = vtable->Get(j); 3585 MethodHelper super_mh(super_method); 3586 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3587 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3588 if (super_method->IsFinal()) { 3589 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3590 PrettyMethod(local_method).c_str(), 3591 super_mh.GetDeclaringClassDescriptor()); 3592 return false; 3593 } 3594 vtable->Set<false>(j, local_method); 3595 local_method->SetMethodIndex(j); 3596 break; 3597 } else { 3598 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3599 << " would have incorrectly overridden the package-private method in " 3600 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3601 } 3602 } 3603 } 3604 if (j == actual_count) { 3605 // Not overriding, append. 3606 vtable->Set<false>(actual_count, local_method); 3607 local_method->SetMethodIndex(actual_count); 3608 actual_count += 1; 3609 } 3610 } 3611 if (!IsUint(16, actual_count)) { 3612 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3613 return false; 3614 } 3615 // Shrink vtable if possible 3616 CHECK_LE(actual_count, max_count); 3617 if (actual_count < max_count) { 3618 vtable.reset(vtable->CopyOf(self, actual_count)); 3619 if (UNLIKELY(vtable.get() == NULL)) { 3620 CHECK(self->IsExceptionPending()); // OOME. 3621 return false; 3622 } 3623 } 3624 klass->SetVTable(vtable.get()); 3625 } else { 3626 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3627 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3628 if (!IsUint(16, num_virtual_methods)) { 3629 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3630 return false; 3631 } 3632 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3633 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3634 if (UNLIKELY(vtable.get() == NULL)) { 3635 CHECK(self->IsExceptionPending()); // OOME. 3636 return false; 3637 } 3638 for (size_t i = 0; i < num_virtual_methods; ++i) { 3639 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3640 vtable->Set<false>(i, virtual_method); 3641 virtual_method->SetMethodIndex(i & 0xFFFF); 3642 } 3643 klass->SetVTable(vtable.get()); 3644 } 3645 return true; 3646} 3647 3648bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3649 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3650 // Set the imt table to be all conflicts by default. 3651 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3652 size_t super_ifcount; 3653 if (klass->HasSuperClass()) { 3654 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3655 } else { 3656 super_ifcount = 0; 3657 } 3658 size_t ifcount = super_ifcount; 3659 uint32_t num_interfaces; 3660 { 3661 ClassHelper kh(klass.get()); 3662 num_interfaces = 3663 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3664 ifcount += num_interfaces; 3665 for (size_t i = 0; i < num_interfaces; i++) { 3666 mirror::Class* interface = 3667 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3668 ifcount += interface->GetIfTableCount(); 3669 } 3670 } 3671 if (ifcount == 0) { 3672 // Class implements no interfaces. 3673 DCHECK_EQ(klass->GetIfTableCount(), 0); 3674 DCHECK(klass->GetIfTable() == NULL); 3675 return true; 3676 } 3677 if (ifcount == super_ifcount) { 3678 // Class implements same interfaces as parent, are any of these not marker interfaces? 3679 bool has_non_marker_interface = false; 3680 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3681 for (size_t i = 0; i < ifcount; ++i) { 3682 if (super_iftable->GetMethodArrayCount(i) > 0) { 3683 has_non_marker_interface = true; 3684 break; 3685 } 3686 } 3687 if (!has_non_marker_interface) { 3688 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3689 klass->SetIfTable(super_iftable); 3690 return true; 3691 } 3692 } 3693 Thread* self = Thread::Current(); 3694 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3695 if (UNLIKELY(iftable.get() == NULL)) { 3696 CHECK(self->IsExceptionPending()); // OOME. 3697 return false; 3698 } 3699 if (super_ifcount != 0) { 3700 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3701 for (size_t i = 0; i < super_ifcount; i++) { 3702 mirror::Class* super_interface = super_iftable->GetInterface(i); 3703 iftable->SetInterface(i, super_interface); 3704 } 3705 } 3706 // Flatten the interface inheritance hierarchy. 3707 size_t idx = super_ifcount; 3708 for (size_t i = 0; i < num_interfaces; i++) { 3709 ClassHelper kh(klass.get()); 3710 mirror::Class* interface = 3711 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3712 DCHECK(interface != NULL); 3713 if (!interface->IsInterface()) { 3714 ClassHelper ih(interface); 3715 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3716 PrettyDescriptor(klass.get()).c_str(), 3717 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3718 return false; 3719 } 3720 // Check if interface is already in iftable 3721 bool duplicate = false; 3722 for (size_t j = 0; j < idx; j++) { 3723 mirror::Class* existing_interface = iftable->GetInterface(j); 3724 if (existing_interface == interface) { 3725 duplicate = true; 3726 break; 3727 } 3728 } 3729 if (!duplicate) { 3730 // Add this non-duplicate interface. 3731 iftable->SetInterface(idx++, interface); 3732 // Add this interface's non-duplicate super-interfaces. 3733 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3734 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3735 bool super_duplicate = false; 3736 for (size_t k = 0; k < idx; k++) { 3737 mirror::Class* existing_interface = iftable->GetInterface(k); 3738 if (existing_interface == super_interface) { 3739 super_duplicate = true; 3740 break; 3741 } 3742 } 3743 if (!super_duplicate) { 3744 iftable->SetInterface(idx++, super_interface); 3745 } 3746 } 3747 } 3748 } 3749 // Shrink iftable in case duplicates were found 3750 if (idx < ifcount) { 3751 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3752 if (UNLIKELY(iftable.get() == NULL)) { 3753 CHECK(self->IsExceptionPending()); // OOME. 3754 return false; 3755 } 3756 ifcount = idx; 3757 } else { 3758 CHECK_EQ(idx, ifcount); 3759 } 3760 klass->SetIfTable(iftable.get()); 3761 3762 // If we're an interface, we don't need the vtable pointers, so we're done. 3763 if (klass->IsInterface()) { 3764 return true; 3765 } 3766 // Allocate imtable 3767 bool imtable_changed = false; 3768 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3769 if (UNLIKELY(imtable.get() == NULL)) { 3770 CHECK(self->IsExceptionPending()); // OOME. 3771 return false; 3772 } 3773 std::vector<mirror::ArtMethod*> miranda_list; 3774 for (size_t i = 0; i < ifcount; ++i) { 3775 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3776 if (num_methods > 0) { 3777 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3778 method_array(self, AllocArtMethodArray(self, num_methods)); 3779 if (UNLIKELY(method_array.get() == nullptr)) { 3780 CHECK(self->IsExceptionPending()); // OOME. 3781 return false; 3782 } 3783 iftable->SetMethodArray(i, method_array.get()); 3784 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3785 klass->GetVTableDuringLinking()); 3786 for (size_t j = 0; j < num_methods; ++j) { 3787 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3788 MethodHelper interface_mh(interface_method); 3789 int32_t k; 3790 // For each method listed in the interface's method list, find the 3791 // matching method in our class's method list. We want to favor the 3792 // subclass over the superclass, which just requires walking 3793 // back from the end of the vtable. (This only matters if the 3794 // superclass defines a private method and this class redefines 3795 // it -- otherwise it would use the same vtable slot. In .dex files 3796 // those don't end up in the virtual method table, so it shouldn't 3797 // matter which direction we go. We walk it backward anyway.) 3798 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3799 mirror::ArtMethod* vtable_method = vtable->Get(k); 3800 MethodHelper vtable_mh(vtable_method); 3801 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3802 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3803 ThrowIllegalAccessError(klass.get(), 3804 "Method '%s' implementing interface method '%s' is not public", 3805 PrettyMethod(vtable_method).c_str(), 3806 PrettyMethod(interface_method).c_str()); 3807 return false; 3808 } 3809 method_array->Set<false>(j, vtable_method); 3810 // Place method in imt if entry is empty, place conflict otherwise. 3811 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3812 if (imtable->Get(imt_index) == NULL) { 3813 imtable->Set<false>(imt_index, vtable_method); 3814 imtable_changed = true; 3815 } else { 3816 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3817 } 3818 break; 3819 } 3820 } 3821 if (k < 0) { 3822 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3823 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3824 mirror::ArtMethod* mir_method = miranda_list[mir]; 3825 MethodHelper vtable_mh(mir_method); 3826 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3827 miranda_method.reset(miranda_list[mir]); 3828 break; 3829 } 3830 } 3831 if (miranda_method.get() == NULL) { 3832 // Point the interface table at a phantom slot. 3833 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3834 if (UNLIKELY(miranda_method.get() == NULL)) { 3835 CHECK(self->IsExceptionPending()); // OOME. 3836 return false; 3837 } 3838 // TODO: If a methods move then the miranda_list may hold stale references. 3839 miranda_list.push_back(miranda_method.get()); 3840 } 3841 method_array->Set<false>(j, miranda_method.get()); 3842 } 3843 } 3844 } 3845 } 3846 if (imtable_changed) { 3847 // Fill in empty entries in interface method table with conflict. 3848 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3849 for (size_t i = 0; i < kImtSize; i++) { 3850 if (imtable->Get(i) == NULL) { 3851 imtable->Set<false>(i, imt_conflict_method); 3852 } 3853 } 3854 klass->SetImTable(imtable.get()); 3855 } 3856 if (!miranda_list.empty()) { 3857 int old_method_count = klass->NumVirtualMethods(); 3858 int new_method_count = old_method_count + miranda_list.size(); 3859 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3860 if (old_method_count == 0) { 3861 virtuals = AllocArtMethodArray(self, new_method_count); 3862 } else { 3863 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3864 } 3865 if (UNLIKELY(virtuals == NULL)) { 3866 CHECK(self->IsExceptionPending()); // OOME. 3867 return false; 3868 } 3869 klass->SetVirtualMethods(virtuals); 3870 3871 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3872 vtable(self, klass->GetVTableDuringLinking()); 3873 CHECK(vtable.get() != NULL); 3874 int old_vtable_count = vtable->GetLength(); 3875 int new_vtable_count = old_vtable_count + miranda_list.size(); 3876 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3877 if (UNLIKELY(vtable.get() == NULL)) { 3878 CHECK(self->IsExceptionPending()); // OOME. 3879 return false; 3880 } 3881 for (size_t i = 0; i < miranda_list.size(); ++i) { 3882 mirror::ArtMethod* method = miranda_list[i]; 3883 // Leave the declaring class alone as type indices are relative to it 3884 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3885 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3886 klass->SetVirtualMethod(old_method_count + i, method); 3887 vtable->Set<false>(old_vtable_count + i, method); 3888 } 3889 // TODO: do not assign to the vtable field until it is fully constructed. 3890 klass->SetVTable(vtable.get()); 3891 } 3892 3893 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3894 for (int i = 0; i < vtable->GetLength(); ++i) { 3895 CHECK(vtable->Get(i) != NULL); 3896 } 3897 3898// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3899 3900 return true; 3901} 3902 3903bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3904 CHECK(klass.get() != NULL); 3905 return LinkFields(klass, false); 3906} 3907 3908bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3909 CHECK(klass.get() != NULL); 3910 size_t allocated_class_size = klass->GetClassSize(); 3911 bool success = LinkFields(klass, true); 3912 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3913 return success; 3914} 3915 3916struct LinkFieldsComparator { 3917 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3918 } 3919 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3920 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3921 NO_THREAD_SAFETY_ANALYSIS { 3922 // First come reference fields, then 64-bit, and finally 32-bit 3923 FieldHelper fh1(field1); 3924 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3925 FieldHelper fh2(field2); 3926 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3927 if (type1 != type2) { 3928 bool is_primitive1 = type1 != Primitive::kPrimNot; 3929 bool is_primitive2 = type2 != Primitive::kPrimNot; 3930 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3931 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3932 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3933 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3934 if (order1 != order2) { 3935 return order1 < order2; 3936 } 3937 } 3938 // same basic group? then sort by string. 3939 const char* name1 = fh1.GetName(); 3940 const char* name2 = fh2.GetName(); 3941 return strcmp(name1, name2) < 0; 3942 } 3943}; 3944 3945bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3946 size_t num_fields = 3947 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3948 3949 mirror::ObjectArray<mirror::ArtField>* fields = 3950 is_static ? klass->GetSFields() : klass->GetIFields(); 3951 3952 // Initialize size and field_offset 3953 size_t size; 3954 MemberOffset field_offset(0); 3955 if (is_static) { 3956 size = klass->GetClassSize(); 3957 field_offset = mirror::Class::FieldsOffset(); 3958 } else { 3959 mirror::Class* super_class = klass->GetSuperClass(); 3960 if (super_class != NULL) { 3961 CHECK(super_class->IsResolved()); 3962 field_offset = MemberOffset(super_class->GetObjectSize()); 3963 } 3964 size = field_offset.Uint32Value(); 3965 } 3966 3967 CHECK_EQ(num_fields == 0, fields == NULL); 3968 3969 // we want a relatively stable order so that adding new fields 3970 // minimizes disruption of C++ version such as Class and Method. 3971 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3972 for (size_t i = 0; i < num_fields; i++) { 3973 mirror::ArtField* f = fields->Get(i); 3974 CHECK(f != NULL); 3975 grouped_and_sorted_fields.push_back(f); 3976 } 3977 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3978 LinkFieldsComparator()); 3979 3980 // References should be at the front. 3981 size_t current_field = 0; 3982 size_t num_reference_fields = 0; 3983 for (; current_field < num_fields; current_field++) { 3984 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3985 FieldHelper fh(field); 3986 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3987 bool isPrimitive = type != Primitive::kPrimNot; 3988 if (isPrimitive) { 3989 break; // past last reference, move on to the next phase 3990 } 3991 grouped_and_sorted_fields.pop_front(); 3992 num_reference_fields++; 3993 fields->Set<false>(current_field, field); 3994 field->SetOffset(field_offset); 3995 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3996 } 3997 3998 // Now we want to pack all of the double-wide fields together. If 3999 // we're not aligned, though, we want to shuffle one 32-bit field 4000 // into place. If we can't find one, we'll have to pad it. 4001 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4002 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4003 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4004 FieldHelper fh(field); 4005 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4006 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4007 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4008 continue; 4009 } 4010 fields->Set<false>(current_field++, field); 4011 field->SetOffset(field_offset); 4012 // drop the consumed field 4013 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4014 break; 4015 } 4016 // whether we found a 32-bit field for padding or not, we advance 4017 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4018 } 4019 4020 // Alignment is good, shuffle any double-wide fields forward, and 4021 // finish assigning field offsets to all fields. 4022 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4023 while (!grouped_and_sorted_fields.empty()) { 4024 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4025 grouped_and_sorted_fields.pop_front(); 4026 FieldHelper fh(field); 4027 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4028 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4029 fields->Set<false>(current_field, field); 4030 field->SetOffset(field_offset); 4031 field_offset = MemberOffset(field_offset.Uint32Value() + 4032 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4033 ? sizeof(uint64_t) 4034 : sizeof(uint32_t))); 4035 current_field++; 4036 } 4037 4038 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4039 if (!is_static && 4040 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4041 // We know there are no non-reference fields in the Reference classes, and we know 4042 // that 'referent' is alphabetically last, so this is easy... 4043 CHECK_EQ(num_reference_fields, num_fields); 4044 FieldHelper fh(fields->Get(num_fields - 1)); 4045 CHECK_STREQ(fh.GetName(), "referent"); 4046 --num_reference_fields; 4047 } 4048 4049 if (kIsDebugBuild) { 4050 // Make sure that all reference fields appear before 4051 // non-reference fields, and all double-wide fields are aligned. 4052 bool seen_non_ref = false; 4053 for (size_t i = 0; i < num_fields; i++) { 4054 mirror::ArtField* field = fields->Get(i); 4055 if (false) { // enable to debug field layout 4056 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4057 << " class=" << PrettyClass(klass.get()) 4058 << " field=" << PrettyField(field) 4059 << " offset=" 4060 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4061 } 4062 FieldHelper fh(field); 4063 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4064 bool is_primitive = type != Primitive::kPrimNot; 4065 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4066 && (strcmp("referent", fh.GetName()) == 0)) { 4067 is_primitive = true; // We lied above, so we have to expect a lie here. 4068 } 4069 if (is_primitive) { 4070 if (!seen_non_ref) { 4071 seen_non_ref = true; 4072 DCHECK_EQ(num_reference_fields, i); 4073 } 4074 } else { 4075 DCHECK(!seen_non_ref); 4076 } 4077 } 4078 if (!seen_non_ref) { 4079 DCHECK_EQ(num_fields, num_reference_fields); 4080 } 4081 } 4082 size = field_offset.Uint32Value(); 4083 // Update klass 4084 if (is_static) { 4085 klass->SetNumReferenceStaticFields(num_reference_fields); 4086 klass->SetClassSize(size); 4087 } else { 4088 klass->SetNumReferenceInstanceFields(num_reference_fields); 4089 if (!klass->IsVariableSize()) { 4090 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4091 size_t previous_size = klass->GetObjectSize(); 4092 if (previous_size != 0) { 4093 // Make sure that we didn't originally have an incorrect size. 4094 CHECK_EQ(previous_size, size); 4095 } 4096 klass->SetObjectSize(size); 4097 } 4098 } 4099 return true; 4100} 4101 4102// Set the bitmap of reference offsets, refOffsets, from the ifields 4103// list. 4104void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4105 uint32_t reference_offsets = 0; 4106 mirror::Class* super_class = klass->GetSuperClass(); 4107 if (super_class != NULL) { 4108 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4109 // If our superclass overflowed, we don't stand a chance. 4110 if (reference_offsets == CLASS_WALK_SUPER) { 4111 klass->SetReferenceInstanceOffsets(reference_offsets); 4112 return; 4113 } 4114 } 4115 CreateReferenceOffsets(klass, false, reference_offsets); 4116} 4117 4118void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4119 CreateReferenceOffsets(klass, true, 0); 4120} 4121 4122void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4123 uint32_t reference_offsets) { 4124 size_t num_reference_fields = 4125 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4126 : klass->NumReferenceInstanceFieldsDuringLinking(); 4127 mirror::ObjectArray<mirror::ArtField>* fields = 4128 is_static ? klass->GetSFields() : klass->GetIFields(); 4129 // All of the fields that contain object references are guaranteed 4130 // to be at the beginning of the fields list. 4131 for (size_t i = 0; i < num_reference_fields; ++i) { 4132 // Note that byte_offset is the offset from the beginning of 4133 // object, not the offset into instance data 4134 mirror::ArtField* field = fields->Get(i); 4135 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4136 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4137 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4138 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4139 CHECK_NE(new_bit, 0U); 4140 reference_offsets |= new_bit; 4141 } else { 4142 reference_offsets = CLASS_WALK_SUPER; 4143 break; 4144 } 4145 } 4146 // Update fields in klass 4147 if (is_static) { 4148 klass->SetReferenceStaticOffsets(reference_offsets); 4149 } else { 4150 klass->SetReferenceInstanceOffsets(reference_offsets); 4151 } 4152} 4153 4154mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4155 const SirtRef<mirror::DexCache>& dex_cache) { 4156 DCHECK(dex_cache.get() != nullptr); 4157 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4158 if (resolved != NULL) { 4159 return resolved; 4160 } 4161 uint32_t utf16_length; 4162 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4163 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4164 dex_cache->SetResolvedString(string_idx, string); 4165 return string; 4166} 4167 4168mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4169 mirror::Class* referrer) { 4170 Thread* self = Thread::Current(); 4171 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4172 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4173 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4174} 4175 4176mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4177 const SirtRef<mirror::DexCache>& dex_cache, 4178 const SirtRef<mirror::ClassLoader>& class_loader) { 4179 DCHECK(dex_cache.get() != NULL); 4180 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4181 if (resolved == NULL) { 4182 Thread* self = Thread::Current(); 4183 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4184 resolved = FindClass(self, descriptor, class_loader); 4185 if (resolved != NULL) { 4186 // TODO: we used to throw here if resolved's class loader was not the 4187 // boot class loader. This was to permit different classes with the 4188 // same name to be loaded simultaneously by different loaders 4189 dex_cache->SetResolvedType(type_idx, resolved); 4190 } else { 4191 CHECK(self->IsExceptionPending()) 4192 << "Expected pending exception for failed resolution of: " << descriptor; 4193 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4194 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4195 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4196 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4197 self->ClearException(); 4198 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4199 self->GetException(NULL)->SetCause(cause.get()); 4200 } 4201 } 4202 } 4203 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4204 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4205 return resolved; 4206} 4207 4208mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4209 uint32_t method_idx, 4210 const SirtRef<mirror::DexCache>& dex_cache, 4211 const SirtRef<mirror::ClassLoader>& class_loader, 4212 mirror::ArtMethod* referrer, 4213 InvokeType type) { 4214 DCHECK(dex_cache.get() != NULL); 4215 // Check for hit in the dex cache. 4216 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4217 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4218 return resolved; 4219 } 4220 // Fail, get the declaring class. 4221 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4222 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4223 if (klass == NULL) { 4224 DCHECK(Thread::Current()->IsExceptionPending()); 4225 return NULL; 4226 } 4227 // Scan using method_idx, this saves string compares but will only hit for matching dex 4228 // caches/files. 4229 switch (type) { 4230 case kDirect: // Fall-through. 4231 case kStatic: 4232 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4233 break; 4234 case kInterface: 4235 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4236 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4237 break; 4238 case kSuper: // Fall-through. 4239 case kVirtual: 4240 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4241 break; 4242 default: 4243 LOG(FATAL) << "Unreachable - invocation type: " << type; 4244 } 4245 if (resolved == NULL) { 4246 // Search by name, which works across dex files. 4247 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4248 const Signature signature = dex_file.GetMethodSignature(method_id); 4249 switch (type) { 4250 case kDirect: // Fall-through. 4251 case kStatic: 4252 resolved = klass->FindDirectMethod(name, signature); 4253 break; 4254 case kInterface: 4255 resolved = klass->FindInterfaceMethod(name, signature); 4256 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4257 break; 4258 case kSuper: // Fall-through. 4259 case kVirtual: 4260 resolved = klass->FindVirtualMethod(name, signature); 4261 break; 4262 } 4263 } 4264 if (resolved != NULL) { 4265 // We found a method, check for incompatible class changes. 4266 if (resolved->CheckIncompatibleClassChange(type)) { 4267 resolved = NULL; 4268 } 4269 } 4270 if (resolved != NULL) { 4271 // Be a good citizen and update the dex cache to speed subsequent calls. 4272 dex_cache->SetResolvedMethod(method_idx, resolved); 4273 return resolved; 4274 } else { 4275 // We failed to find the method which means either an access error, an incompatible class 4276 // change, or no such method. First try to find the method among direct and virtual methods. 4277 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4278 const Signature signature = dex_file.GetMethodSignature(method_id); 4279 switch (type) { 4280 case kDirect: 4281 case kStatic: 4282 resolved = klass->FindVirtualMethod(name, signature); 4283 break; 4284 case kInterface: 4285 case kVirtual: 4286 case kSuper: 4287 resolved = klass->FindDirectMethod(name, signature); 4288 break; 4289 } 4290 4291 // If we found something, check that it can be accessed by the referrer. 4292 if (resolved != NULL && referrer != NULL) { 4293 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4294 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4295 if (!referring_class->CanAccess(methods_class)) { 4296 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4297 resolved, type); 4298 return NULL; 4299 } else if (!referring_class->CanAccessMember(methods_class, 4300 resolved->GetAccessFlags())) { 4301 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4302 return NULL; 4303 } 4304 } 4305 4306 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4307 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4308 switch (type) { 4309 case kDirect: 4310 case kStatic: 4311 if (resolved != NULL) { 4312 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4313 } else { 4314 resolved = klass->FindInterfaceMethod(name, signature); 4315 if (resolved != NULL) { 4316 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4317 } else { 4318 ThrowNoSuchMethodError(type, klass, name, signature); 4319 } 4320 } 4321 break; 4322 case kInterface: 4323 if (resolved != NULL) { 4324 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4325 } else { 4326 resolved = klass->FindVirtualMethod(name, signature); 4327 if (resolved != NULL) { 4328 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4329 } else { 4330 ThrowNoSuchMethodError(type, klass, name, signature); 4331 } 4332 } 4333 break; 4334 case kSuper: 4335 ThrowNoSuchMethodError(type, klass, name, signature); 4336 break; 4337 case kVirtual: 4338 if (resolved != NULL) { 4339 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4340 } else { 4341 resolved = klass->FindInterfaceMethod(name, signature); 4342 if (resolved != NULL) { 4343 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4344 } else { 4345 ThrowNoSuchMethodError(type, klass, name, signature); 4346 } 4347 } 4348 break; 4349 } 4350 DCHECK(Thread::Current()->IsExceptionPending()); 4351 return NULL; 4352 } 4353} 4354 4355mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4356 const SirtRef<mirror::DexCache>& dex_cache, 4357 const SirtRef<mirror::ClassLoader>& class_loader, 4358 bool is_static) { 4359 DCHECK(dex_cache.get() != nullptr); 4360 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4361 if (resolved != NULL) { 4362 return resolved; 4363 } 4364 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4365 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4366 if (klass == NULL) { 4367 DCHECK(Thread::Current()->IsExceptionPending()); 4368 return NULL; 4369 } 4370 4371 if (is_static) { 4372 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4373 } else { 4374 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4375 } 4376 4377 if (resolved == NULL) { 4378 const char* name = dex_file.GetFieldName(field_id); 4379 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4380 if (is_static) { 4381 resolved = klass->FindStaticField(name, type); 4382 } else { 4383 resolved = klass->FindInstanceField(name, type); 4384 } 4385 if (resolved == NULL) { 4386 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4387 return NULL; 4388 } 4389 } 4390 dex_cache->SetResolvedField(field_idx, resolved); 4391 return resolved; 4392} 4393 4394mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4395 uint32_t field_idx, 4396 const SirtRef<mirror::DexCache>& dex_cache, 4397 const SirtRef<mirror::ClassLoader>& class_loader) { 4398 DCHECK(dex_cache.get() != nullptr); 4399 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4400 if (resolved != NULL) { 4401 return resolved; 4402 } 4403 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4404 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4405 if (klass == NULL) { 4406 DCHECK(Thread::Current()->IsExceptionPending()); 4407 return NULL; 4408 } 4409 4410 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4411 StringPiece type(dex_file.StringDataByIdx( 4412 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4413 resolved = klass->FindField(name, type); 4414 if (resolved != NULL) { 4415 dex_cache->SetResolvedField(field_idx, resolved); 4416 } else { 4417 ThrowNoSuchFieldError("", klass, type, name); 4418 } 4419 return resolved; 4420} 4421 4422const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4423 uint32_t* length) { 4424 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4425 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4426 const DexFile& dex_file = *dex_cache->GetDexFile(); 4427 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4428 return dex_file.GetMethodShorty(method_id, length); 4429} 4430 4431void ClassLinker::DumpAllClasses(int flags) { 4432 if (dex_cache_image_class_lookup_required_) { 4433 MoveImageClassesToClassTable(); 4434 } 4435 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4436 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4437 std::vector<mirror::Class*> all_classes; 4438 { 4439 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4440 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4441 all_classes.push_back(it.second); 4442 } 4443 } 4444 4445 for (size_t i = 0; i < all_classes.size(); ++i) { 4446 all_classes[i]->DumpClass(std::cerr, flags); 4447 } 4448} 4449 4450void ClassLinker::DumpForSigQuit(std::ostream& os) { 4451 if (dex_cache_image_class_lookup_required_) { 4452 MoveImageClassesToClassTable(); 4453 } 4454 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4455 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4456} 4457 4458size_t ClassLinker::NumLoadedClasses() { 4459 if (dex_cache_image_class_lookup_required_) { 4460 MoveImageClassesToClassTable(); 4461 } 4462 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4463 return class_table_.size(); 4464} 4465 4466pid_t ClassLinker::GetClassesLockOwner() { 4467 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4468} 4469 4470pid_t ClassLinker::GetDexLockOwner() { 4471 return dex_lock_.GetExclusiveOwnerTid(); 4472} 4473 4474void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4475 DCHECK(!init_done_); 4476 4477 DCHECK(klass != NULL); 4478 DCHECK(klass->GetClassLoader() == NULL); 4479 4480 DCHECK(class_roots_ != NULL); 4481 DCHECK(class_roots_->Get(class_root) == NULL); 4482 class_roots_->Set<false>(class_root, klass); 4483} 4484 4485} // namespace art 4486