class_linker.cc revision 6449c62e40ef3a9bb75f664f922555affb532ee4
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <sys/types.h> 23#include <sys/wait.h> 24 25#include <deque> 26#include <string> 27#include <utility> 28#include <vector> 29 30#include "base/casts.h" 31#include "base/logging.h" 32#include "base/stl_util.h" 33#include "base/unix_file/fd_file.h" 34#include "class_linker-inl.h" 35#include "compiler_callbacks.h" 36#include "debugger.h" 37#include "dex_file-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "sirt_ref.h" 65#include "stack_indirect_reference_table.h" 66#include "thread.h" 67#include "UniquePtr.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 ClassHelper ve_ch(c->GetVerifyErrorClass()); 102 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(NULL), 180 array_iftable_(NULL), 181 init_done_(false), 182 dex_caches_dirty_(false), 183 class_table_dirty_(false), 184 intern_table_(intern_table), 185 portable_resolution_trampoline_(NULL), 186 quick_resolution_trampoline_(NULL), 187 portable_imt_conflict_trampoline_(NULL), 188 quick_imt_conflict_trampoline_(NULL) { 189 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190} 191 192void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 193 VLOG(startup) << "ClassLinker::Init"; 194 CHECK(Runtime::Current()->IsCompiler()); 195 196 CHECK(!init_done_); 197 198 // java_lang_Class comes first, it's needed for AllocClass 199 Thread* self = Thread::Current(); 200 gc::Heap* heap = Runtime::Current()->GetHeap(); 201 // The GC can't handle an object with a null class since we can't get the size of this object. 202 heap->IncrementDisableMovingGC(self); 203 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 204 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 205 CHECK(java_lang_Class.get() != NULL); 206 mirror::Class::SetClassClass(java_lang_Class.get()); 207 java_lang_Class->SetClass(java_lang_Class.get()); 208 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 209 heap->DecrementDisableMovingGC(self); 210 // AllocClass(mirror::Class*) can now be used 211 212 // Class[] is used for reflection support. 213 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 214 class_array_class->SetComponentType(java_lang_Class.get()); 215 216 // java_lang_Object comes next so that object_array_class can be created. 217 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 218 CHECK(java_lang_Object.get() != NULL); 219 // backfill Object as the super class of Class. 220 java_lang_Class->SetSuperClass(java_lang_Object.get()); 221 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 222 223 // Object[] next to hold class roots. 224 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 225 object_array_class->SetComponentType(java_lang_Object.get()); 226 227 // Setup the char class to be used for char[]. 228 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 229 230 // Setup the char[] class to be used for String. 231 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 232 char_array_class->SetComponentType(char_class.get()); 233 mirror::CharArray::SetArrayClass(char_array_class.get()); 234 235 // Setup String. 236 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 237 mirror::String::SetClass(java_lang_String.get()); 238 java_lang_String->SetObjectSize(sizeof(mirror::String)); 239 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 240 241 // Create storage for root classes, save away our work so far (requires descriptors). 242 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 243 kClassRootsMax); 244 CHECK(class_roots_ != NULL); 245 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 246 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 247 SetClassRoot(kClassArrayClass, class_array_class.get()); 248 SetClassRoot(kObjectArrayClass, object_array_class.get()); 249 SetClassRoot(kCharArrayClass, char_array_class.get()); 250 SetClassRoot(kJavaLangString, java_lang_String.get()); 251 252 // Setup the primitive type classes. 253 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 254 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 255 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 256 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 257 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 258 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 259 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 260 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 261 262 // Create array interface entries to populate once we can load system classes. 263 array_iftable_ = AllocIfTable(self, 2); 264 265 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 266 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 267 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 268 mirror::IntArray::SetArrayClass(int_array_class.get()); 269 SetClassRoot(kIntArrayClass, int_array_class.get()); 270 271 // now that these are registered, we can use AllocClass() and AllocObjectArray 272 273 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 274 SirtRef<mirror::Class> 275 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 276 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 277 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 278 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 279 280 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 281 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 282 sizeof(mirror::ArtFieldClass))); 283 CHECK(java_lang_reflect_ArtField.get() != NULL); 284 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 285 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 286 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 287 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 288 289 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 290 sizeof(mirror::ArtMethodClass))); 291 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 292 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 293 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 294 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 295 296 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 297 298 // Set up array classes for string, field, method 299 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 300 sizeof(mirror::Class))); 301 object_array_string->SetComponentType(java_lang_String.get()); 302 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 303 304 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 305 sizeof(mirror::Class))); 306 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 307 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 308 309 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 310 sizeof(mirror::Class))); 311 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 312 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 313 314 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 315 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 316 // these roots. 317 CHECK_NE(0U, boot_class_path.size()); 318 for (size_t i = 0; i != boot_class_path.size(); ++i) { 319 const DexFile* dex_file = boot_class_path[i]; 320 CHECK(dex_file != NULL); 321 AppendToBootClassPath(*dex_file); 322 } 323 324 // now we can use FindSystemClass 325 326 // run char class through InitializePrimitiveClass to finish init 327 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 328 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 329 330 // Create runtime resolution and imt conflict methods. Also setup the default imt. 331 Runtime* runtime = Runtime::Current(); 332 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 333 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 334 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 335 336 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 337 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 338 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 339 CHECK_EQ(java_lang_Object.get(), Object_class); 340 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 341 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 342 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 343 CHECK_EQ(java_lang_String.get(), String_class); 344 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 345 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 346 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 349 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 350 351 // Setup the primitive array type classes - can't be done until Object has a vtable. 352 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 353 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 354 355 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 356 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 357 358 mirror::Class* found_char_array_class = FindSystemClass("[C"); 359 CHECK_EQ(char_array_class.get(), found_char_array_class); 360 361 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 362 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 363 364 mirror::Class* found_int_array_class = FindSystemClass("[I"); 365 CHECK_EQ(int_array_class.get(), found_int_array_class); 366 367 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 368 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 369 370 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 371 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 372 373 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 374 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 375 376 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 377 CHECK_EQ(class_array_class.get(), found_class_array_class); 378 379 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 380 CHECK_EQ(object_array_class.get(), found_object_array_class); 381 382 // Setup the single, global copy of "iftable". 383 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 384 CHECK(java_lang_Cloneable != NULL); 385 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 386 CHECK(java_io_Serializable != NULL); 387 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 388 // crawl up and explicitly list all of the supers as well. 389 array_iftable_->SetInterface(0, java_lang_Cloneable); 390 array_iftable_->SetInterface(1, java_io_Serializable); 391 392 // Sanity check Class[] and Object[]'s interfaces. 393 ClassHelper kh(class_array_class.get()); 394 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 395 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 396 kh.ChangeClass(object_array_class.get()); 397 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 398 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 399 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 400 // dex_cache_ fields and register them in class_table_. 401 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 402 CHECK_EQ(java_lang_Class.get(), Class_class); 403 404 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 405 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 406 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 407 408 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 409 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 410 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 411 412 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 413 CHECK_EQ(object_array_string.get(), String_array_class); 414 415 mirror::Class* Art_method_array_class = 416 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 417 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 418 419 mirror::Class* Art_field_array_class = 420 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 421 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 422 423 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 424 425 // Create java.lang.reflect.Proxy root. 426 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 427 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 428 429 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 430 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 431 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 432 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 433 java_lang_ref_FinalizerReference->SetAccessFlags( 434 java_lang_ref_FinalizerReference->GetAccessFlags() | 435 kAccClassIsReference | kAccClassIsFinalizerReference); 436 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 437 java_lang_ref_PhantomReference->SetAccessFlags( 438 java_lang_ref_PhantomReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsPhantomReference); 440 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 441 java_lang_ref_SoftReference->SetAccessFlags( 442 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 443 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 444 java_lang_ref_WeakReference->SetAccessFlags( 445 java_lang_ref_WeakReference->GetAccessFlags() | 446 kAccClassIsReference | kAccClassIsWeakReference); 447 448 // Setup the ClassLoader, verifying the object_size_. 449 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 450 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 451 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 452 453 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 454 // java.lang.StackTraceElement as a convenience. 455 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 456 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 457 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 458 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 459 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 460 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 461 462 FinishInit(); 463 464 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 465} 466 467void ClassLinker::FinishInit() { 468 VLOG(startup) << "ClassLinker::FinishInit entering"; 469 470 // Let the heap know some key offsets into java.lang.ref instances 471 // Note: we hard code the field indexes here rather than using FindInstanceField 472 // as the types of the field can't be resolved prior to the runtime being 473 // fully initialized 474 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 475 mirror::Class* java_lang_ref_FinalizerReference = 476 FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 477 478 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 479 FieldHelper fh(pendingNext); 480 CHECK_STREQ(fh.GetName(), "pendingNext"); 481 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 482 483 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 484 fh.ChangeField(queue); 485 CHECK_STREQ(fh.GetName(), "queue"); 486 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 487 488 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 489 fh.ChangeField(queueNext); 490 CHECK_STREQ(fh.GetName(), "queueNext"); 491 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 492 493 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 494 fh.ChangeField(referent); 495 CHECK_STREQ(fh.GetName(), "referent"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 497 498 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 499 fh.ChangeField(zombie); 500 CHECK_STREQ(fh.GetName(), "zombie"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 502 503 gc::Heap* heap = Runtime::Current()->GetHeap(); 504 heap->SetReferenceOffsets(referent->GetOffset(), 505 queue->GetOffset(), 506 queueNext->GetOffset(), 507 pendingNext->GetOffset(), 508 zombie->GetOffset()); 509 510 // ensure all class_roots_ are initialized 511 for (size_t i = 0; i < kClassRootsMax; i++) { 512 ClassRoot class_root = static_cast<ClassRoot>(i); 513 mirror::Class* klass = GetClassRoot(class_root); 514 CHECK(klass != NULL); 515 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 516 // note SetClassRoot does additional validation. 517 // if possible add new checks there to catch errors early 518 } 519 520 CHECK(array_iftable_ != NULL); 521 522 // disable the slow paths in FindClass and CreatePrimitiveClass now 523 // that Object, Class, and Object[] are setup 524 init_done_ = true; 525 526 VLOG(startup) << "ClassLinker::FinishInit exiting"; 527} 528 529void ClassLinker::RunRootClinits() { 530 Thread* self = Thread::Current(); 531 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 532 mirror::Class* c = GetClassRoot(ClassRoot(i)); 533 if (!c->IsArrayClass() && !c->IsPrimitive()) { 534 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 535 EnsureInitialized(sirt_class, true, true); 536 self->AssertNoPendingException(); 537 } 538 } 539} 540 541bool ClassLinker::GenerateOatFile(const char* dex_filename, 542 int oat_fd, 543 const char* oat_cache_filename, 544 std::string* error_msg) { 545 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 546 std::string dex2oat_string(GetAndroidRoot()); 547 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 548 const char* dex2oat = dex2oat_string.c_str(); 549 550 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 551 552 gc::Heap* heap = Runtime::Current()->GetHeap(); 553 std::string boot_image_option("--boot-image="); 554 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 555 556 std::string dex_file_option("--dex-file="); 557 dex_file_option += dex_filename; 558 559 std::string oat_fd_option("--oat-fd="); 560 StringAppendF(&oat_fd_option, "%d", oat_fd); 561 562 std::string oat_location_option("--oat-location="); 563 oat_location_option += oat_cache_filename; 564 565 std::vector<std::string> argv; 566 argv.push_back(dex2oat); 567 argv.push_back("--runtime-arg"); 568 argv.push_back("-Xms64m"); 569 argv.push_back("--runtime-arg"); 570 argv.push_back("-Xmx64m"); 571 argv.push_back("--runtime-arg"); 572 argv.push_back("-classpath"); 573 argv.push_back("--runtime-arg"); 574 argv.push_back(class_path); 575 if (!kIsTargetBuild) { 576 argv.push_back("--host"); 577 } 578 argv.push_back(boot_image_option); 579 argv.push_back(dex_file_option); 580 argv.push_back(oat_fd_option); 581 argv.push_back(oat_location_option); 582 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 583 for (size_t i = 0; compiler_options.size(); ++i) { 584 argv.push_back(compiler_options[i].c_str()); 585 } 586 587 return Exec(argv, error_msg); 588} 589 590const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 591 WriterMutexLock mu(Thread::Current(), dex_lock_); 592 if (kIsDebugBuild) { 593 for (size_t i = 0; i < oat_files_.size(); ++i) { 594 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 595 } 596 } 597 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 598 oat_files_.push_back(oat_file); 599 return oat_file; 600} 601 602OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 603 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 604 OatFile* oat_file = space->ReleaseOatFile(); 605 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 606 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 607 return *oat_file; 608} 609 610const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 611 const char* dex_location = dex_file.GetLocation().c_str(); 612 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 613 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 614} 615 616const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 617 const uint32_t* const dex_location_checksum) { 618 ReaderMutexLock mu(Thread::Current(), dex_lock_); 619 for (size_t i = 0; i < oat_files_.size(); i++) { 620 const OatFile* oat_file = oat_files_[i]; 621 DCHECK(oat_file != NULL); 622 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 623 dex_location_checksum, 624 false); 625 if (oat_dex_file != NULL) { 626 return oat_file; 627 } 628 } 629 return NULL; 630} 631 632const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 633 uint32_t dex_location_checksum, 634 const char* oat_location, 635 std::string* error_msg) { 636 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 637 !Runtime::Current()->IsCompiler(), 638 error_msg)); 639 if (oat_file.get() == nullptr) { 640 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 641 error_msg->c_str()); 642 return nullptr; 643 } 644 Runtime* runtime = Runtime::Current(); 645 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 646 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 647 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 648 if (expected_image_oat_checksum != actual_image_oat_checksum) { 649 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 650 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 651 actual_image_oat_checksum); 652 return nullptr; 653 } 654 655 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 656 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 657 if (expected_image_oat_offset != actual_image_oat_offset) { 658 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 659 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 660 actual_image_oat_offset); 661 return nullptr; 662 } 663 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 664 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 665 // the oat file. 666 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 667 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 668 &dex_location_checksum); 669 if (oat_dex_file == nullptr) { 670 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 671 dex_location); 672 return nullptr; 673 } 674 uint32_t expected_dex_checksum = dex_location_checksum; 675 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 676 if (expected_dex_checksum != actual_dex_checksum) { 677 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 678 "found 0x%x", oat_location, expected_dex_checksum, 679 actual_dex_checksum); 680 return nullptr; 681 } 682 return oat_dex_file->OpenDexFile(error_msg); 683} 684 685class ScopedFlock { 686 public: 687 ScopedFlock() {} 688 689 bool Init(const char* filename, std::string* error_msg) { 690 while (true) { 691 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 692 if (file_.get() == NULL) { 693 *error_msg = StringPrintf("Failed to open file '%s'", filename); 694 return false; 695 } 696 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 697 if (flock_result != 0) { 698 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 699 return false; 700 } 701 struct stat fstat_stat; 702 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 703 if (fstat_result != 0) { 704 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 705 return false; 706 } 707 struct stat stat_stat; 708 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 709 if (stat_result != 0) { 710 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 711 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 712 continue; 713 } 714 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 715 LOG(WARNING) << "File changed while locking, will retry: " << filename; 716 continue; 717 } 718 return true; 719 } 720 } 721 722 File& GetFile() { 723 return *file_; 724 } 725 726 ~ScopedFlock() { 727 if (file_.get() != NULL) { 728 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 729 CHECK_EQ(0, flock_result); 730 } 731 } 732 733 private: 734 UniquePtr<File> file_; 735 736 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 737}; 738 739const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 740 uint32_t dex_location_checksum, 741 const char* oat_location, 742 std::string* error_msg) { 743 // We play a locking game here so that if two different processes 744 // race to generate (or worse, one tries to open a partial generated 745 // file) we will be okay. This is actually common with apps that use 746 // DexClassLoader to work around the dex method reference limit and 747 // that have a background service running in a separate process. 748 ScopedFlock scoped_flock; 749 if (!scoped_flock.Init(oat_location, error_msg)) { 750 return nullptr; 751 } 752 753 // Check if we already have an up-to-date output file 754 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 755 oat_location, error_msg); 756 if (dex_file != nullptr) { 757 return dex_file; 758 } 759 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 760 << oat_location << "': " << *error_msg; 761 error_msg->clear(); 762 763 // Generate the output oat file for the dex file 764 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 765 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 766 CHECK(!error_msg->empty()); 767 return nullptr; 768 } 769 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 770 !Runtime::Current()->IsCompiler(), 771 error_msg); 772 if (oat_file == nullptr) { 773 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 774 oat_location, error_msg->c_str()); 775 return nullptr; 776 } 777 oat_file = RegisterOatFile(oat_file); 778 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 779 &dex_location_checksum); 780 if (oat_dex_file == nullptr) { 781 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 782 "'%s'", dex_location, dex_location_checksum, oat_location); 783 return nullptr; 784 } 785 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 786 CHECK(result != nullptr) << *error_msg; 787 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 788 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 789 << " dex_location_checksum=" << dex_location_checksum 790 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 791 return result; 792} 793 794bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 795 const char* dex_location, 796 uint32_t dex_location_checksum, 797 std::string* error_msg) { 798 Runtime* runtime = Runtime::Current(); 799 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 800 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 801 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 802 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 803 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 804 805 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 806 if (oat_dex_file == NULL) { 807 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 808 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 809 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 810 for (size_t i = 0; i < oat_dex_files.size(); i++) { 811 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 812 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 813 oat_file->GetLocation().c_str(), 814 oat_dex_file->GetDexFileLocation().c_str()); 815 } 816 return false; 817 } 818 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 819 820 if (image_check && dex_check) { 821 return true; 822 } 823 824 if (!image_check) { 825 ScopedObjectAccess soa(Thread::Current()); 826 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 827 std::string image_file(oat_location->ToModifiedUtf8()); 828 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %" PRIdPTR ")", 829 oat_file->GetLocation().c_str(), 830 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 831 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 832 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 833 } 834 if (!dex_check) { 835 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 836 oat_file->GetLocation().c_str(), 837 oat_dex_file->GetDexFileLocationChecksum(), 838 dex_location, dex_location_checksum); 839 } 840 return false; 841} 842 843const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 844 const char* dex_location, 845 std::string* error_msg, 846 bool* open_failed) { 847 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 848 if (oat_file.get() == nullptr) { 849 *open_failed = true; 850 return nullptr; 851 } 852 *open_failed = false; 853 uint32_t dex_location_checksum; 854 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 855 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 856 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 857 // directory. 858 const OatFile* opened_oat_file = oat_file.release(); 859 opened_oat_file = RegisterOatFile(opened_oat_file); 860 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 861 if (oat_dex_file == nullptr) { 862 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 863 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 864 error_msg->c_str()); 865 return nullptr; 866 } 867 return oat_dex_file->OpenDexFile(error_msg); 868 } 869 870 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 871 error_msg); 872 if (!verified) { 873 return nullptr; 874 } 875 const OatFile* opened_oat_file = oat_file.release(); 876 opened_oat_file = RegisterOatFile(opened_oat_file); 877 return opened_oat_file->GetOatDexFile(dex_location, 878 &dex_location_checksum)->OpenDexFile(error_msg); 879} 880 881const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 882 const uint32_t* const dex_location_checksum, 883 std::string* error_msg) { 884 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 885 dex_location_checksum); 886 if (open_oat_file != nullptr) { 887 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 888 dex_location_checksum); 889 return oat_dex_file->OpenDexFile(error_msg); 890 } 891 892 // Look for an existing file next to dex. for example, for 893 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 894 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 895 bool open_failed; 896 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 897 error_msg, &open_failed); 898 if (dex_file != nullptr) { 899 return dex_file; 900 } 901 if (dex_location_checksum == nullptr) { 902 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 903 odex_filename.c_str(), dex_location, error_msg->c_str()); 904 return nullptr; 905 } 906 907 std::string cache_error_msg; 908 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 909 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 910 &open_failed); 911 if (dex_file != nullptr) { 912 return dex_file; 913 } 914 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 915 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 916 } 917 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 918 << " (error '" << *error_msg << "') or " << cache_location 919 << " (error '" << cache_error_msg << "')."; 920 921 // Try to generate oat file if it wasn't found or was obsolete. 922 error_msg->clear(); 923 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 924 cache_location.c_str(), error_msg); 925} 926 927const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 928 ReaderMutexLock mu(Thread::Current(), dex_lock_); 929 for (size_t i = 0; i < oat_files_.size(); i++) { 930 const OatFile* oat_file = oat_files_[i]; 931 DCHECK(oat_file != nullptr); 932 if (oat_file->GetLocation() == oat_location) { 933 return oat_file; 934 } 935 } 936 return nullptr; 937} 938 939const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 940 std::string* error_msg) { 941 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 942 if (oat_file != nullptr) { 943 return oat_file; 944 } 945 946 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 947 error_msg); 948 if (oat_file == NULL) { 949 return NULL; 950 } 951 return oat_file; 952} 953 954static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 955 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 956 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 957 958 DCHECK(obj != NULL); 959 DCHECK(class_linker != NULL); 960 961 if (obj->IsArtMethod()) { 962 mirror::ArtMethod* method = obj->AsArtMethod(); 963 if (!method->IsNative()) { 964 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 965 if (method != Runtime::Current()->GetResolutionMethod()) { 966 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 967 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 968 } 969 } 970 } 971} 972 973void ClassLinker::InitFromImage() { 974 VLOG(startup) << "ClassLinker::InitFromImage entering"; 975 CHECK(!init_done_); 976 977 Thread* self = Thread::Current(); 978 gc::Heap* heap = Runtime::Current()->GetHeap(); 979 gc::space::ImageSpace* space = heap->GetImageSpace(); 980 dex_cache_image_class_lookup_required_ = true; 981 CHECK(space != NULL); 982 OatFile& oat_file = GetImageOatFile(space); 983 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 984 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 985 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 986 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 987 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 988 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 989 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 990 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 991 mirror::ObjectArray<mirror::DexCache>* dex_caches = 992 dex_caches_object->AsObjectArray<mirror::DexCache>(); 993 994 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 995 self, 996 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 997 class_roots_ = class_roots.get(); 998 999 // Special case of setting up the String class early so that we can test arbitrary objects 1000 // as being Strings or not 1001 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1002 1003 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1004 static_cast<uint32_t>(dex_caches->GetLength())); 1005 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1006 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1007 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1008 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1009 nullptr); 1010 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1011 std::string error_msg; 1012 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1013 if (dex_file == NULL) { 1014 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1015 << " from within oat file " << oat_file.GetLocation() 1016 << " error '" << error_msg << "'"; 1017 } 1018 1019 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1020 1021 AppendToBootClassPath(*dex_file, dex_cache); 1022 } 1023 1024 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1025 // bitmap walk. 1026 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1027 1028 // Set entry point to interpreter if in InterpretOnly mode. 1029 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1030 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1031 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1032 } 1033 1034 // reinit class_roots_ 1035 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1036 class_roots_ = class_roots.get(); 1037 1038 // reinit array_iftable_ from any array class instance, they should be == 1039 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1040 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1041 // String class root was set above 1042 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1043 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1044 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1045 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1046 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1047 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1048 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1049 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1050 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1051 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1052 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1053 1054 FinishInit(); 1055 1056 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1057} 1058 1059// Keep in sync with InitCallback. Anything we visit, we need to 1060// reinit references to when reinitializing a ClassLinker from a 1061// mapped image. 1062void ClassLinker::VisitRoots(RootCallback* callback, void* arg, bool only_dirty, bool clean_dirty) { 1063 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1064 Thread* self = Thread::Current(); 1065 { 1066 ReaderMutexLock mu(self, dex_lock_); 1067 if (!only_dirty || dex_caches_dirty_) { 1068 for (mirror::DexCache*& dex_cache : dex_caches_) { 1069 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1070 DCHECK(dex_cache != nullptr); 1071 } 1072 if (clean_dirty) { 1073 dex_caches_dirty_ = false; 1074 } 1075 } 1076 } 1077 { 1078 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1079 if (!only_dirty || class_table_dirty_) { 1080 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1081 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1082 DCHECK(it.second != nullptr); 1083 } 1084 if (clean_dirty) { 1085 class_table_dirty_ = false; 1086 } 1087 } 1088 // We deliberately ignore the class roots in the image since we 1089 // handle image roots by using the MS/CMS rescanning of dirty cards. 1090 } 1091 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1092 DCHECK(array_iftable_ != nullptr); 1093} 1094 1095void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1096 if (dex_cache_image_class_lookup_required_) { 1097 MoveImageClassesToClassTable(); 1098 } 1099 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1100 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1101 if (!visitor(it.second, arg)) { 1102 return; 1103 } 1104 } 1105} 1106 1107static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1108 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1109 classes->insert(c); 1110 return true; 1111} 1112 1113void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1114 std::set<mirror::Class*> classes; 1115 VisitClasses(GetClassesVisitor, &classes); 1116 for (mirror::Class* klass : classes) { 1117 if (!visitor(klass, arg)) { 1118 return; 1119 } 1120 } 1121} 1122 1123ClassLinker::~ClassLinker() { 1124 mirror::Class::ResetClass(); 1125 mirror::String::ResetClass(); 1126 mirror::ArtField::ResetClass(); 1127 mirror::ArtMethod::ResetClass(); 1128 mirror::BooleanArray::ResetArrayClass(); 1129 mirror::ByteArray::ResetArrayClass(); 1130 mirror::CharArray::ResetArrayClass(); 1131 mirror::DoubleArray::ResetArrayClass(); 1132 mirror::FloatArray::ResetArrayClass(); 1133 mirror::IntArray::ResetArrayClass(); 1134 mirror::LongArray::ResetArrayClass(); 1135 mirror::ShortArray::ResetArrayClass(); 1136 mirror::Throwable::ResetClass(); 1137 mirror::StackTraceElement::ResetClass(); 1138 STLDeleteElements(&boot_class_path_); 1139 STLDeleteElements(&oat_files_); 1140} 1141 1142mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1143 gc::Heap* heap = Runtime::Current()->GetHeap(); 1144 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1145 SirtRef<mirror::DexCache> dex_cache( 1146 self, down_cast<mirror::DexCache*>( 1147 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1148 if (dex_cache.get() == NULL) { 1149 return NULL; 1150 } 1151 SirtRef<mirror::String> 1152 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1153 if (location.get() == NULL) { 1154 return NULL; 1155 } 1156 SirtRef<mirror::ObjectArray<mirror::String> > 1157 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1158 if (strings.get() == NULL) { 1159 return NULL; 1160 } 1161 SirtRef<mirror::ObjectArray<mirror::Class> > 1162 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1163 if (types.get() == NULL) { 1164 return NULL; 1165 } 1166 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1167 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1168 if (methods.get() == NULL) { 1169 return NULL; 1170 } 1171 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1172 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1173 if (fields.get() == NULL) { 1174 return NULL; 1175 } 1176 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1177 fields.get()); 1178 return dex_cache.get(); 1179} 1180 1181mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1182 size_t class_size) { 1183 DCHECK_GE(class_size, sizeof(mirror::Class)); 1184 gc::Heap* heap = Runtime::Current()->GetHeap(); 1185 mirror::Object* k = 1186 kMovingClasses ? 1187 heap->AllocObject<true>(self, java_lang_Class, class_size) : 1188 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size); 1189 if (UNLIKELY(k == NULL)) { 1190 CHECK(self->IsExceptionPending()); // OOME. 1191 return NULL; 1192 } 1193 mirror::Class* klass = k->AsClass(); 1194 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1195 klass->SetClassSize(class_size); 1196 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1197 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1198 return klass; 1199} 1200 1201mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1202 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1203} 1204 1205mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1206 return down_cast<mirror::ArtField*>( 1207 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1208} 1209 1210mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1211 return down_cast<mirror::ArtMethod*>( 1212 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1213} 1214 1215mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1216 Thread* self, size_t length) { 1217 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1218 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1219} 1220 1221static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1222 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1223 DCHECK(klass != NULL); 1224 // Wait for the class if it has not already been linked. 1225 if (!klass->IsResolved() && !klass->IsErroneous()) { 1226 SirtRef<mirror::Class> sirt_class(self, klass); 1227 ObjectLock<mirror::Class> lock(self, &sirt_class); 1228 // Check for circular dependencies between classes. 1229 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1230 ThrowClassCircularityError(sirt_class.get()); 1231 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1232 return nullptr; 1233 } 1234 // Wait for the pending initialization to complete. 1235 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1236 lock.WaitIgnoringInterrupts(); 1237 } 1238 klass = sirt_class.get(); 1239 } 1240 if (klass->IsErroneous()) { 1241 ThrowEarlierClassFailure(klass); 1242 return nullptr; 1243 } 1244 // Return the loaded class. No exceptions should be pending. 1245 CHECK(klass->IsResolved()) << PrettyClass(klass); 1246 self->AssertNoPendingException(); 1247 return klass; 1248} 1249 1250bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1251 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1252 return pair.second != NULL; 1253} 1254 1255mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1256 SirtRef<mirror::ClassLoader> class_loader(Thread::Current(), nullptr); 1257 return FindClass(descriptor, class_loader); 1258} 1259 1260mirror::Class* ClassLinker::FindClass(const char* descriptor, 1261 const SirtRef<mirror::ClassLoader>& class_loader) { 1262 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1263 Thread* self = Thread::Current(); 1264 DCHECK(self != NULL); 1265 self->AssertNoPendingException(); 1266 if (descriptor[1] == '\0') { 1267 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1268 // for primitive classes that aren't backed by dex files. 1269 return FindPrimitiveClass(descriptor[0]); 1270 } 1271 // Find the class in the loaded classes table. 1272 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1273 if (klass != NULL) { 1274 return EnsureResolved(self, klass); 1275 } 1276 // Class is not yet loaded. 1277 if (descriptor[0] == '[') { 1278 return CreateArrayClass(descriptor, class_loader); 1279 } else if (class_loader.get() == nullptr) { 1280 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1281 if (pair.second != NULL) { 1282 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1283 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1284 } 1285 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1286 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1287 // throw of a NoClassDefFoundError. 1288 if (IsInBootClassPath(descriptor)) { 1289 mirror::Class* system_class = FindSystemClass(descriptor); 1290 CHECK(system_class != NULL); 1291 return system_class; 1292 } 1293 // Next try the compile time class path. 1294 const std::vector<const DexFile*>* class_path; 1295 { 1296 ScopedObjectAccessUnchecked soa(self); 1297 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1298 soa.AddLocalReference<jobject>(class_loader.get())); 1299 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1300 } 1301 1302 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1303 if (pair.second != NULL) { 1304 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1305 } 1306 1307 } else { 1308 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1309 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1310 soa.AddLocalReference<jobject>(class_loader.get())); 1311 std::string class_name_string(DescriptorToDot(descriptor)); 1312 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1313 { 1314 ScopedThreadStateChange tsc(self, kNative); 1315 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1316 soa.Env()->NewStringUTF(class_name_string.c_str())); 1317 if (class_name_object.get() == NULL) { 1318 return NULL; 1319 } 1320 CHECK(class_loader_object.get() != NULL); 1321 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1322 WellKnownClasses::java_lang_ClassLoader_loadClass, 1323 class_name_object.get())); 1324 } 1325 if (soa.Self()->IsExceptionPending()) { 1326 // If the ClassLoader threw, pass that exception up. 1327 return NULL; 1328 } else if (result.get() == NULL) { 1329 // broken loader - throw NPE to be compatible with Dalvik 1330 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1331 class_name_string.c_str()).c_str()); 1332 return NULL; 1333 } else { 1334 // success, return mirror::Class* 1335 return soa.Decode<mirror::Class*>(result.get()); 1336 } 1337 } 1338 1339 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1340 return NULL; 1341} 1342 1343mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1344 const SirtRef<mirror::ClassLoader>& class_loader, 1345 const DexFile& dex_file, 1346 const DexFile::ClassDef& dex_class_def) { 1347 Thread* self = Thread::Current(); 1348 SirtRef<mirror::Class> klass(self, NULL); 1349 // Load the class from the dex file. 1350 if (UNLIKELY(!init_done_)) { 1351 // finish up init of hand crafted class_roots_ 1352 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1353 klass.reset(GetClassRoot(kJavaLangObject)); 1354 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1355 klass.reset(GetClassRoot(kJavaLangClass)); 1356 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1357 klass.reset(GetClassRoot(kJavaLangString)); 1358 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1359 klass.reset(GetClassRoot(kJavaLangDexCache)); 1360 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1361 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1362 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1363 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1364 } else { 1365 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1366 } 1367 } else { 1368 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1369 } 1370 if (UNLIKELY(klass.get() == NULL)) { 1371 CHECK(self->IsExceptionPending()); // Expect an OOME. 1372 return NULL; 1373 } 1374 klass->SetDexCache(FindDexCache(dex_file)); 1375 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1376 // Check for a pending exception during load 1377 if (self->IsExceptionPending()) { 1378 klass->SetStatus(mirror::Class::kStatusError, self); 1379 return NULL; 1380 } 1381 ObjectLock<mirror::Class> lock(self, &klass); 1382 klass->SetClinitThreadId(self->GetTid()); 1383 // Add the newly loaded class to the loaded classes table. 1384 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1385 if (existing != NULL) { 1386 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1387 // this thread to block. 1388 return EnsureResolved(self, existing); 1389 } 1390 // Finish loading (if necessary) by finding parents 1391 CHECK(!klass->IsLoaded()); 1392 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1393 // Loading failed. 1394 klass->SetStatus(mirror::Class::kStatusError, self); 1395 return NULL; 1396 } 1397 CHECK(klass->IsLoaded()); 1398 // Link the class (if necessary) 1399 CHECK(!klass->IsResolved()); 1400 // TODO: Use fast jobjects? 1401 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1402 if (!LinkClass(self, klass, interfaces)) { 1403 // Linking failed. 1404 klass->SetStatus(mirror::Class::kStatusError, self); 1405 return NULL; 1406 } 1407 CHECK(klass->IsResolved()); 1408 1409 /* 1410 * We send CLASS_PREPARE events to the debugger from here. The 1411 * definition of "preparation" is creating the static fields for a 1412 * class and initializing them to the standard default values, but not 1413 * executing any code (that comes later, during "initialization"). 1414 * 1415 * We did the static preparation in LinkClass. 1416 * 1417 * The class has been prepared and resolved but possibly not yet verified 1418 * at this point. 1419 */ 1420 Dbg::PostClassPrepare(klass.get()); 1421 1422 return klass.get(); 1423} 1424 1425// Precomputes size that will be needed for Class, matching LinkStaticFields 1426size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1427 const DexFile::ClassDef& dex_class_def) { 1428 const byte* class_data = dex_file.GetClassData(dex_class_def); 1429 size_t num_ref = 0; 1430 size_t num_32 = 0; 1431 size_t num_64 = 0; 1432 if (class_data != NULL) { 1433 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1434 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1435 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1436 char c = descriptor[0]; 1437 if (c == 'L' || c == '[') { 1438 num_ref++; 1439 } else if (c == 'J' || c == 'D') { 1440 num_64++; 1441 } else { 1442 num_32++; 1443 } 1444 } 1445 } 1446 // start with generic class data 1447 size_t size = sizeof(mirror::Class); 1448 // follow with reference fields which must be contiguous at start 1449 size += (num_ref * sizeof(uint32_t)); 1450 // if there are 64-bit fields to add, make sure they are aligned 1451 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1452 if (num_32 != 0) { 1453 // use an available 32-bit field for padding 1454 num_32--; 1455 } 1456 size += sizeof(uint32_t); // either way, we are adding a word 1457 DCHECK_EQ(size, RoundUp(size, 8)); 1458 } 1459 // tack on any 64-bit fields now that alignment is assured 1460 size += (num_64 * sizeof(uint64_t)); 1461 // tack on any remaining 32-bit fields 1462 size += (num_32 * sizeof(uint32_t)); 1463 return size; 1464} 1465 1466const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1467 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1468 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1469 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1470 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1471 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1472 &dex_location_checksum); 1473 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1474 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1475 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1476 return oat_class; 1477} 1478 1479static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1480 uint32_t method_idx) { 1481 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1482 const byte* class_data = dex_file.GetClassData(class_def); 1483 CHECK(class_data != NULL); 1484 ClassDataItemIterator it(dex_file, class_data); 1485 // Skip fields 1486 while (it.HasNextStaticField()) { 1487 it.Next(); 1488 } 1489 while (it.HasNextInstanceField()) { 1490 it.Next(); 1491 } 1492 // Process methods 1493 size_t class_def_method_index = 0; 1494 while (it.HasNextDirectMethod()) { 1495 if (it.GetMemberIndex() == method_idx) { 1496 return class_def_method_index; 1497 } 1498 class_def_method_index++; 1499 it.Next(); 1500 } 1501 while (it.HasNextVirtualMethod()) { 1502 if (it.GetMemberIndex() == method_idx) { 1503 return class_def_method_index; 1504 } 1505 class_def_method_index++; 1506 it.Next(); 1507 } 1508 DCHECK(!it.HasNext()); 1509 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1510 return 0; 1511} 1512 1513const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1514 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1515 // method for direct methods (or virtual methods made direct). 1516 mirror::Class* declaring_class = method->GetDeclaringClass(); 1517 size_t oat_method_index; 1518 if (method->IsStatic() || method->IsDirect()) { 1519 // Simple case where the oat method index was stashed at load time. 1520 oat_method_index = method->GetMethodIndex(); 1521 } else { 1522 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1523 // by search for its position in the declared virtual methods. 1524 oat_method_index = declaring_class->NumDirectMethods(); 1525 size_t end = declaring_class->NumVirtualMethods(); 1526 bool found = false; 1527 for (size_t i = 0; i < end; i++) { 1528 if (declaring_class->GetVirtualMethod(i) == method) { 1529 found = true; 1530 break; 1531 } 1532 oat_method_index++; 1533 } 1534 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1535 } 1536 UniquePtr<const OatFile::OatClass> 1537 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1538 declaring_class->GetDexClassDefIndex())); 1539 CHECK(oat_class.get() != NULL); 1540 DCHECK_EQ(oat_method_index, 1541 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1542 method->GetDeclaringClass()->GetDexClassDefIndex(), 1543 method->GetDexMethodIndex())); 1544 1545 return oat_class->GetOatMethod(oat_method_index); 1546} 1547 1548// Special case to get oat code without overwriting a trampoline. 1549const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1550 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1551 if (method->IsProxyMethod()) { 1552 return GetQuickProxyInvokeHandler(); 1553 } 1554 const void* result = GetOatMethodFor(method).GetQuickCode(); 1555 if (result == nullptr) { 1556 if (method->IsPortableCompiled()) { 1557 // No code? Do we expect portable code? 1558 result = GetQuickToPortableBridge(); 1559 } else { 1560 // No code? You must mean to go into the interpreter. 1561 result = GetQuickToInterpreterBridge(); 1562 } 1563 } 1564 return result; 1565} 1566 1567const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1568 bool* have_portable_code) { 1569 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1570 *have_portable_code = false; 1571 if (method->IsProxyMethod()) { 1572 return GetPortableProxyInvokeHandler(); 1573 } 1574 const void* result = GetOatMethodFor(method).GetPortableCode(); 1575 if (result == nullptr) { 1576 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1577 // No code? You must mean to go into the interpreter. 1578 result = GetPortableToInterpreterBridge(); 1579 } else { 1580 // No code? But there's quick code, so use a bridge. 1581 result = GetPortableToQuickBridge(); 1582 } 1583 } else { 1584 *have_portable_code = true; 1585 } 1586 return result; 1587} 1588 1589const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1590 uint32_t method_idx) { 1591 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1592 CHECK(oat_class.get() != nullptr); 1593 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1594 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1595} 1596 1597const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1598 uint32_t method_idx) { 1599 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1600 CHECK(oat_class.get() != nullptr); 1601 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1602 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1603} 1604 1605// Returns true if the method must run with interpreter, false otherwise. 1606static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1607 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1608 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1609 // No code: need interpreter. 1610 DCHECK(!method->IsNative()); 1611 return true; 1612 } 1613#ifdef ART_SEA_IR_MODE 1614 ScopedObjectAccess soa(Thread::Current()); 1615 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1616 LOG(INFO) << "Found " << PrettyMethod(method); 1617 return false; 1618 } 1619#endif 1620 // If interpreter mode is enabled, every method (except native and proxy) must 1621 // be run with interpreter. 1622 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1623 !method->IsNative() && !method->IsProxyMethod(); 1624} 1625 1626void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1627 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1628 if (klass->NumDirectMethods() == 0) { 1629 return; // No direct methods => no static methods. 1630 } 1631 Runtime* runtime = Runtime::Current(); 1632 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1633 return; // OAT file unavailable. 1634 } 1635 ClassHelper kh(klass); 1636 const DexFile& dex_file = kh.GetDexFile(); 1637 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1638 CHECK(dex_class_def != nullptr); 1639 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1640 // There should always be class data if there were direct methods. 1641 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1642 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1643 CHECK(oat_class.get() != nullptr); 1644 ClassDataItemIterator it(dex_file, class_data); 1645 // Skip fields 1646 while (it.HasNextStaticField()) { 1647 it.Next(); 1648 } 1649 while (it.HasNextInstanceField()) { 1650 it.Next(); 1651 } 1652 // Link the code of methods skipped by LinkCode. 1653 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1654 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1655 if (!method->IsStatic()) { 1656 // Only update static methods. 1657 continue; 1658 } 1659 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1660 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1661 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1662 bool have_portable_code = false; 1663 if (enter_interpreter) { 1664 // Use interpreter entry point. 1665 portable_code = GetPortableToInterpreterBridge(); 1666 quick_code = GetQuickToInterpreterBridge(); 1667 } else { 1668 if (portable_code == nullptr) { 1669 portable_code = GetPortableToQuickBridge(); 1670 } else { 1671 have_portable_code = true; 1672 } 1673 if (quick_code == nullptr) { 1674 quick_code = GetQuickToPortableBridge(); 1675 } 1676 } 1677 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1678 have_portable_code); 1679 } 1680 // Ignore virtual methods on the iterator. 1681} 1682 1683static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1684 uint32_t method_index) 1685 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1686 // Method shouldn't have already been linked. 1687 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1688 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1689 // Every kind of method should at least get an invoke stub from the oat_method. 1690 // non-abstract methods also get their code pointers. 1691 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1692 oat_method.LinkMethod(method.get()); 1693 1694 // Install entry point from interpreter. 1695 Runtime* runtime = Runtime::Current(); 1696 bool enter_interpreter = NeedsInterpreter(method.get(), 1697 method->GetEntryPointFromQuickCompiledCode(), 1698 method->GetEntryPointFromPortableCompiledCode()); 1699 if (enter_interpreter) { 1700 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1701 } else { 1702 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1703 } 1704 1705 if (method->IsAbstract()) { 1706 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1707 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1708 return; 1709 } 1710 1711 bool have_portable_code = false; 1712 if (method->IsStatic() && !method->IsConstructor()) { 1713 // For static methods excluding the class initializer, install the trampoline. 1714 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1715 // after initializing class (see ClassLinker::InitializeClass method). 1716 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1717 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1718 } else if (enter_interpreter) { 1719 // Set entry point from compiled code if there's no code or in interpreter only mode. 1720 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1721 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1722 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1723 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1724 have_portable_code = true; 1725 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1726 } else { 1727 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1728 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1729 } 1730 1731 if (method->IsNative()) { 1732 // Unregistering restores the dlsym lookup stub. 1733 method->UnregisterNative(Thread::Current()); 1734 } 1735 1736 // Allow instrumentation its chance to hijack code. 1737 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1738 method->GetEntryPointFromQuickCompiledCode(), 1739 method->GetEntryPointFromPortableCompiledCode(), 1740 have_portable_code); 1741} 1742 1743void ClassLinker::LoadClass(const DexFile& dex_file, 1744 const DexFile::ClassDef& dex_class_def, 1745 const SirtRef<mirror::Class>& klass, 1746 mirror::ClassLoader* class_loader) { 1747 CHECK(klass.get() != NULL); 1748 CHECK(klass->GetDexCache() != NULL); 1749 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1750 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1751 CHECK(descriptor != NULL); 1752 1753 klass->SetClass(GetClassRoot(kJavaLangClass)); 1754 uint32_t access_flags = dex_class_def.access_flags_; 1755 // Make sure that none of our runtime-only flags are set. 1756 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1757 klass->SetAccessFlags(access_flags); 1758 klass->SetClassLoader(class_loader); 1759 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1760 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1761 1762 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1763 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1764 1765 // Load fields fields. 1766 const byte* class_data = dex_file.GetClassData(dex_class_def); 1767 if (class_data == NULL) { 1768 return; // no fields or methods - for example a marker interface 1769 } 1770 ClassDataItemIterator it(dex_file, class_data); 1771 Thread* self = Thread::Current(); 1772 if (it.NumStaticFields() != 0) { 1773 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1774 if (UNLIKELY(statics == NULL)) { 1775 CHECK(self->IsExceptionPending()); // OOME. 1776 return; 1777 } 1778 klass->SetSFields(statics); 1779 } 1780 if (it.NumInstanceFields() != 0) { 1781 mirror::ObjectArray<mirror::ArtField>* fields = 1782 AllocArtFieldArray(self, it.NumInstanceFields()); 1783 if (UNLIKELY(fields == NULL)) { 1784 CHECK(self->IsExceptionPending()); // OOME. 1785 return; 1786 } 1787 klass->SetIFields(fields); 1788 } 1789 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1790 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1791 if (UNLIKELY(sfield.get() == NULL)) { 1792 CHECK(self->IsExceptionPending()); // OOME. 1793 return; 1794 } 1795 klass->SetStaticField(i, sfield.get()); 1796 LoadField(dex_file, it, klass, sfield); 1797 } 1798 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1799 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1800 if (UNLIKELY(ifield.get() == NULL)) { 1801 CHECK(self->IsExceptionPending()); // OOME. 1802 return; 1803 } 1804 klass->SetInstanceField(i, ifield.get()); 1805 LoadField(dex_file, it, klass, ifield); 1806 } 1807 1808 UniquePtr<const OatFile::OatClass> oat_class; 1809 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1810 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1811 } 1812 1813 // Load methods. 1814 if (it.NumDirectMethods() != 0) { 1815 // TODO: append direct methods to class object 1816 mirror::ObjectArray<mirror::ArtMethod>* directs = 1817 AllocArtMethodArray(self, it.NumDirectMethods()); 1818 if (UNLIKELY(directs == NULL)) { 1819 CHECK(self->IsExceptionPending()); // OOME. 1820 return; 1821 } 1822 klass->SetDirectMethods(directs); 1823 } 1824 if (it.NumVirtualMethods() != 0) { 1825 // TODO: append direct methods to class object 1826 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1827 AllocArtMethodArray(self, it.NumVirtualMethods()); 1828 if (UNLIKELY(virtuals == NULL)) { 1829 CHECK(self->IsExceptionPending()); // OOME. 1830 return; 1831 } 1832 klass->SetVirtualMethods(virtuals); 1833 } 1834 size_t class_def_method_index = 0; 1835 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1836 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1837 if (UNLIKELY(method.get() == NULL)) { 1838 CHECK(self->IsExceptionPending()); // OOME. 1839 return; 1840 } 1841 klass->SetDirectMethod(i, method.get()); 1842 if (oat_class.get() != NULL) { 1843 LinkCode(method, oat_class.get(), class_def_method_index); 1844 } 1845 method->SetMethodIndex(class_def_method_index); 1846 class_def_method_index++; 1847 } 1848 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1849 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1850 if (UNLIKELY(method.get() == NULL)) { 1851 CHECK(self->IsExceptionPending()); // OOME. 1852 return; 1853 } 1854 klass->SetVirtualMethod(i, method.get()); 1855 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1856 if (oat_class.get() != NULL) { 1857 LinkCode(method, oat_class.get(), class_def_method_index); 1858 } 1859 class_def_method_index++; 1860 } 1861 DCHECK(!it.HasNext()); 1862} 1863 1864void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1865 const SirtRef<mirror::Class>& klass, 1866 const SirtRef<mirror::ArtField>& dst) { 1867 uint32_t field_idx = it.GetMemberIndex(); 1868 dst->SetDexFieldIndex(field_idx); 1869 dst->SetDeclaringClass(klass.get()); 1870 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1871} 1872 1873mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1874 const ClassDataItemIterator& it, 1875 const SirtRef<mirror::Class>& klass) { 1876 uint32_t dex_method_idx = it.GetMemberIndex(); 1877 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1878 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1879 1880 mirror::ArtMethod* dst = AllocArtMethod(self); 1881 if (UNLIKELY(dst == NULL)) { 1882 CHECK(self->IsExceptionPending()); // OOME. 1883 return NULL; 1884 } 1885 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1886 1887 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1888 dst->SetDexMethodIndex(dex_method_idx); 1889 dst->SetDeclaringClass(klass.get()); 1890 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1891 1892 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1893 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1894 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1895 1896 uint32_t access_flags = it.GetMemberAccessFlags(); 1897 1898 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1899 // Set finalizable flag on declaring class. 1900 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1901 // Void return type. 1902 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1903 klass->SetFinalizable(); 1904 } else { 1905 ClassHelper kh(klass.get()); 1906 const char* klass_descriptor = kh.GetDescriptor(); 1907 // The Enum class declares a "final" finalize() method to prevent subclasses from 1908 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1909 // subclasses, so we exclude it here. 1910 // We also want to avoid setting the flag on Object, where we know that finalize() is 1911 // empty. 1912 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1913 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1914 klass->SetFinalizable(); 1915 } 1916 } 1917 } 1918 } else if (method_name[0] == '<') { 1919 // Fix broken access flags for initializers. Bug 11157540. 1920 bool is_init = (strcmp("<init>", method_name) == 0); 1921 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1922 if (UNLIKELY(!is_init && !is_clinit)) { 1923 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1924 } else { 1925 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1926 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1927 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1928 access_flags |= kAccConstructor; 1929 } 1930 } 1931 } 1932 dst->SetAccessFlags(access_flags); 1933 1934 self->EndAssertNoThreadSuspension(old_cause); 1935 return dst; 1936} 1937 1938void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1939 Thread* self = Thread::Current(); 1940 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1941 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1942 AppendToBootClassPath(dex_file, dex_cache); 1943} 1944 1945void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 1946 const SirtRef<mirror::DexCache>& dex_cache) { 1947 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1948 boot_class_path_.push_back(&dex_file); 1949 RegisterDexFile(dex_file, dex_cache); 1950} 1951 1952bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1953 dex_lock_.AssertSharedHeld(Thread::Current()); 1954 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1955 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1956 return true; 1957 } 1958 } 1959 return false; 1960} 1961 1962bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1963 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1964 return IsDexFileRegisteredLocked(dex_file); 1965} 1966 1967void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 1968 const SirtRef<mirror::DexCache>& dex_cache) { 1969 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1970 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1971 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1972 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1973 dex_caches_.push_back(dex_cache.get()); 1974 dex_cache->SetDexFile(&dex_file); 1975 dex_caches_dirty_ = true; 1976} 1977 1978void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1979 Thread* self = Thread::Current(); 1980 { 1981 ReaderMutexLock mu(self, dex_lock_); 1982 if (IsDexFileRegisteredLocked(dex_file)) { 1983 return; 1984 } 1985 } 1986 // Don't alloc while holding the lock, since allocation may need to 1987 // suspend all threads and another thread may need the dex_lock_ to 1988 // get to a suspend point. 1989 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1990 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1991 { 1992 WriterMutexLock mu(self, dex_lock_); 1993 if (IsDexFileRegisteredLocked(dex_file)) { 1994 return; 1995 } 1996 RegisterDexFileLocked(dex_file, dex_cache); 1997 } 1998} 1999 2000void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2001 const SirtRef<mirror::DexCache>& dex_cache) { 2002 WriterMutexLock mu(Thread::Current(), dex_lock_); 2003 RegisterDexFileLocked(dex_file, dex_cache); 2004} 2005 2006mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2007 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2008 // Search assuming unique-ness of dex file. 2009 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2010 mirror::DexCache* dex_cache = dex_caches_[i]; 2011 if (dex_cache->GetDexFile() == &dex_file) { 2012 return dex_cache; 2013 } 2014 } 2015 // Search matching by location name. 2016 std::string location(dex_file.GetLocation()); 2017 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2018 mirror::DexCache* dex_cache = dex_caches_[i]; 2019 if (dex_cache->GetDexFile()->GetLocation() == location) { 2020 return dex_cache; 2021 } 2022 } 2023 // Failure, dump diagnostic and abort. 2024 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2025 mirror::DexCache* dex_cache = dex_caches_[i]; 2026 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2027 } 2028 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2029 return NULL; 2030} 2031 2032void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2033 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2034 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2035 dex_caches_[i]->Fixup(resolution_method); 2036 } 2037} 2038 2039mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2040 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2041 if (UNLIKELY(klass == NULL)) { 2042 return NULL; 2043 } 2044 return InitializePrimitiveClass(klass, type); 2045} 2046 2047mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2048 Primitive::Type type) { 2049 CHECK(primitive_class != NULL); 2050 // Must hold lock on object when initializing. 2051 Thread* self = Thread::Current(); 2052 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2053 ObjectLock<mirror::Class> lock(self, &sirt_class); 2054 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2055 primitive_class->SetPrimitiveType(type); 2056 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2057 const char* descriptor = Primitive::Descriptor(type); 2058 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2059 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2060 return primitive_class; 2061} 2062 2063// Create an array class (i.e. the class object for the array, not the 2064// array itself). "descriptor" looks like "[C" or "[[[[B" or 2065// "[Ljava/lang/String;". 2066// 2067// If "descriptor" refers to an array of primitives, look up the 2068// primitive type's internally-generated class object. 2069// 2070// "class_loader" is the class loader of the class that's referring to 2071// us. It's used to ensure that we're looking for the element type in 2072// the right context. It does NOT become the class loader for the 2073// array class; that always comes from the base element class. 2074// 2075// Returns NULL with an exception raised on failure. 2076mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2077 const SirtRef<mirror::ClassLoader>& class_loader) { 2078 // Identify the underlying component type 2079 CHECK_EQ('[', descriptor[0]); 2080 Thread* self = Thread::Current(); 2081 SirtRef<mirror::Class> component_type(self, FindClass(descriptor + 1, class_loader)); 2082 if (component_type.get() == nullptr) { 2083 DCHECK(self->IsExceptionPending()); 2084 return nullptr; 2085 } 2086 2087 // See if the component type is already loaded. Array classes are 2088 // always associated with the class loader of their underlying 2089 // element type -- an array of Strings goes with the loader for 2090 // java/lang/String -- so we need to look for it there. (The 2091 // caller should have checked for the existence of the class 2092 // before calling here, but they did so with *their* class loader, 2093 // not the component type's loader.) 2094 // 2095 // If we find it, the caller adds "loader" to the class' initiating 2096 // loader list, which should prevent us from going through this again. 2097 // 2098 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2099 // are the same, because our caller (FindClass) just did the 2100 // lookup. (Even if we get this wrong we still have correct behavior, 2101 // because we effectively do this lookup again when we add the new 2102 // class to the hash table --- necessary because of possible races with 2103 // other threads.) 2104 if (class_loader.get() != component_type->GetClassLoader()) { 2105 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2106 if (new_class != NULL) { 2107 return new_class; 2108 } 2109 } 2110 2111 // Fill out the fields in the Class. 2112 // 2113 // It is possible to execute some methods against arrays, because 2114 // all arrays are subclasses of java_lang_Object_, so we need to set 2115 // up a vtable. We can just point at the one in java_lang_Object_. 2116 // 2117 // Array classes are simple enough that we don't need to do a full 2118 // link step. 2119 SirtRef<mirror::Class> new_class(self, NULL); 2120 if (UNLIKELY(!init_done_)) { 2121 // Classes that were hand created, ie not by FindSystemClass 2122 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2123 new_class.reset(GetClassRoot(kClassArrayClass)); 2124 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2125 new_class.reset(GetClassRoot(kObjectArrayClass)); 2126 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2127 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2128 } else if (strcmp(descriptor, 2129 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2130 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2131 } else if (strcmp(descriptor, 2132 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2133 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2134 } else if (strcmp(descriptor, "[C") == 0) { 2135 new_class.reset(GetClassRoot(kCharArrayClass)); 2136 } else if (strcmp(descriptor, "[I") == 0) { 2137 new_class.reset(GetClassRoot(kIntArrayClass)); 2138 } 2139 } 2140 if (new_class.get() == nullptr) { 2141 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2142 if (new_class.get() == nullptr) { 2143 return nullptr; 2144 } 2145 new_class->SetComponentType(component_type.get()); 2146 } 2147 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2148 DCHECK(new_class->GetComponentType() != NULL); 2149 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2150 new_class->SetSuperClass(java_lang_Object); 2151 new_class->SetVTable(java_lang_Object->GetVTable()); 2152 new_class->SetPrimitiveType(Primitive::kPrimNot); 2153 new_class->SetClassLoader(component_type->GetClassLoader()); 2154 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2155 // don't need to set new_class->SetObjectSize(..) 2156 // because Object::SizeOf delegates to Array::SizeOf 2157 2158 2159 // All arrays have java/lang/Cloneable and java/io/Serializable as 2160 // interfaces. We need to set that up here, so that stuff like 2161 // "instanceof" works right. 2162 // 2163 // Note: The GC could run during the call to FindSystemClass, 2164 // so we need to make sure the class object is GC-valid while we're in 2165 // there. Do this by clearing the interface list so the GC will just 2166 // think that the entries are null. 2167 2168 2169 // Use the single, global copies of "interfaces" and "iftable" 2170 // (remember not to free them for arrays). 2171 CHECK(array_iftable_ != nullptr); 2172 new_class->SetIfTable(array_iftable_); 2173 2174 // Inherit access flags from the component type. 2175 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2176 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2177 access_flags &= kAccJavaFlagsMask; 2178 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2179 // and remove "interface". 2180 access_flags |= kAccAbstract | kAccFinal; 2181 access_flags &= ~kAccInterface; 2182 2183 new_class->SetAccessFlags(access_flags); 2184 2185 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2186 if (existing == nullptr) { 2187 return new_class.get(); 2188 } 2189 // Another thread must have loaded the class after we 2190 // started but before we finished. Abandon what we've 2191 // done. 2192 // 2193 // (Yes, this happens.) 2194 2195 return existing; 2196} 2197 2198mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2199 switch (Primitive::GetType(type)) { 2200 case Primitive::kPrimByte: 2201 return GetClassRoot(kPrimitiveByte); 2202 case Primitive::kPrimChar: 2203 return GetClassRoot(kPrimitiveChar); 2204 case Primitive::kPrimDouble: 2205 return GetClassRoot(kPrimitiveDouble); 2206 case Primitive::kPrimFloat: 2207 return GetClassRoot(kPrimitiveFloat); 2208 case Primitive::kPrimInt: 2209 return GetClassRoot(kPrimitiveInt); 2210 case Primitive::kPrimLong: 2211 return GetClassRoot(kPrimitiveLong); 2212 case Primitive::kPrimShort: 2213 return GetClassRoot(kPrimitiveShort); 2214 case Primitive::kPrimBoolean: 2215 return GetClassRoot(kPrimitiveBoolean); 2216 case Primitive::kPrimVoid: 2217 return GetClassRoot(kPrimitiveVoid); 2218 case Primitive::kPrimNot: 2219 break; 2220 } 2221 std::string printable_type(PrintableChar(type)); 2222 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2223 return NULL; 2224} 2225 2226mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2227 size_t hash) { 2228 if (VLOG_IS_ON(class_linker)) { 2229 mirror::DexCache* dex_cache = klass->GetDexCache(); 2230 std::string source; 2231 if (dex_cache != NULL) { 2232 source += " from "; 2233 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2234 } 2235 LOG(INFO) << "Loaded class " << descriptor << source; 2236 } 2237 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2238 mirror::Class* existing = 2239 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2240 if (existing != NULL) { 2241 return existing; 2242 } 2243 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2244 // Check a class loaded with the system class loader matches one in the image if the class 2245 // is in the image. 2246 existing = LookupClassFromImage(descriptor); 2247 if (existing != NULL) { 2248 CHECK(klass == existing); 2249 } 2250 } 2251 VerifyObject(klass); 2252 class_table_.insert(std::make_pair(hash, klass)); 2253 class_table_dirty_ = true; 2254 return NULL; 2255} 2256 2257bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2258 size_t hash = Hash(descriptor); 2259 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2260 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2261 ++it) { 2262 mirror::Class* klass = it->second; 2263 ClassHelper kh(klass); 2264 if ((klass->GetClassLoader() == class_loader) && 2265 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2266 class_table_.erase(it); 2267 return true; 2268 } 2269 } 2270 return false; 2271} 2272 2273mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2274 const mirror::ClassLoader* class_loader) { 2275 size_t hash = Hash(descriptor); 2276 { 2277 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2278 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2279 if (result != NULL) { 2280 return result; 2281 } 2282 } 2283 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2284 return NULL; 2285 } else { 2286 // Lookup failed but need to search dex_caches_. 2287 mirror::Class* result = LookupClassFromImage(descriptor); 2288 if (result != NULL) { 2289 InsertClass(descriptor, result, hash); 2290 } else { 2291 // Searching the image dex files/caches failed, we don't want to get into this situation 2292 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2293 // classes into the class table. 2294 const int32_t kMaxFailedDexCacheLookups = 1000; 2295 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2296 MoveImageClassesToClassTable(); 2297 } 2298 } 2299 return result; 2300 } 2301} 2302 2303mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2304 const mirror::ClassLoader* class_loader, 2305 size_t hash) { 2306 auto end = class_table_.end(); 2307 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2308 mirror::Class* klass = it->second; 2309 ClassHelper kh(klass); 2310 if ((klass->GetClassLoader() == class_loader) && 2311 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2312 if (kIsDebugBuild) { 2313 // Check for duplicates in the table. 2314 for (++it; it != end && it->first == hash; ++it) { 2315 mirror::Class* klass2 = it->second; 2316 ClassHelper kh(klass2); 2317 CHECK(!((klass2->GetClassLoader() == class_loader) && 2318 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2319 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2320 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2321 } 2322 } 2323 return klass; 2324 } 2325 } 2326 return NULL; 2327} 2328 2329static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2330 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2331 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2332 CHECK(image != NULL); 2333 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2334 return root->AsObjectArray<mirror::DexCache>(); 2335} 2336 2337void ClassLinker::MoveImageClassesToClassTable() { 2338 Thread* self = Thread::Current(); 2339 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2340 if (!dex_cache_image_class_lookup_required_) { 2341 return; // All dex cache classes are already in the class table. 2342 } 2343 const char* old_no_suspend_cause = 2344 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2345 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2346 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2347 mirror::DexCache* dex_cache = dex_caches->Get(i); 2348 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2349 for (int32_t j = 0; j < types->GetLength(); j++) { 2350 mirror::Class* klass = types->Get(j); 2351 if (klass != NULL) { 2352 ClassHelper kh(klass); 2353 DCHECK(klass->GetClassLoader() == NULL); 2354 const char* descriptor = kh.GetDescriptor(); 2355 size_t hash = Hash(descriptor); 2356 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2357 if (existing != NULL) { 2358 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2359 << PrettyClassAndClassLoader(klass); 2360 } else { 2361 class_table_.insert(std::make_pair(hash, klass)); 2362 } 2363 } 2364 } 2365 } 2366 class_table_dirty_ = true; 2367 dex_cache_image_class_lookup_required_ = false; 2368 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2369} 2370 2371mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2372 Thread* self = Thread::Current(); 2373 const char* old_no_suspend_cause = 2374 self->StartAssertNoThreadSuspension("Image class lookup"); 2375 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2376 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2377 mirror::DexCache* dex_cache = dex_caches->Get(i); 2378 const DexFile* dex_file = dex_cache->GetDexFile(); 2379 // Try binary searching the string/type index. 2380 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2381 if (string_id != NULL) { 2382 const DexFile::TypeId* type_id = 2383 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2384 if (type_id != NULL) { 2385 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2386 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2387 if (klass != NULL) { 2388 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2389 return klass; 2390 } 2391 } 2392 } 2393 } 2394 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2395 return NULL; 2396} 2397 2398void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2399 result.clear(); 2400 if (dex_cache_image_class_lookup_required_) { 2401 MoveImageClassesToClassTable(); 2402 } 2403 size_t hash = Hash(descriptor); 2404 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2405 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2406 it != end && it->first == hash; ++it) { 2407 mirror::Class* klass = it->second; 2408 ClassHelper kh(klass); 2409 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2410 result.push_back(klass); 2411 } 2412 } 2413} 2414 2415void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2416 // TODO: assert that the monitor on the Class is held 2417 Thread* self = Thread::Current(); 2418 ObjectLock<mirror::Class> lock(self, &klass); 2419 2420 // Don't attempt to re-verify if already sufficiently verified. 2421 if (klass->IsVerified() || 2422 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2423 return; 2424 } 2425 2426 // The class might already be erroneous, for example at compile time if we attempted to verify 2427 // this class as a parent to another. 2428 if (klass->IsErroneous()) { 2429 ThrowEarlierClassFailure(klass.get()); 2430 return; 2431 } 2432 2433 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2434 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2435 } else { 2436 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2437 << PrettyClass(klass.get()); 2438 CHECK(!Runtime::Current()->IsCompiler()); 2439 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2440 } 2441 2442 // Verify super class. 2443 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2444 if (super.get() != NULL) { 2445 // Acquire lock to prevent races on verifying the super class. 2446 ObjectLock<mirror::Class> lock(self, &super); 2447 2448 if (!super->IsVerified() && !super->IsErroneous()) { 2449 VerifyClass(super); 2450 } 2451 if (!super->IsCompileTimeVerified()) { 2452 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2453 PrettyDescriptor(klass.get()).c_str(), 2454 PrettyDescriptor(super.get()).c_str())); 2455 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2456 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2457 if (cause.get() != nullptr) { 2458 self->ClearException(); 2459 } 2460 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2461 if (cause.get() != nullptr) { 2462 self->GetException(nullptr)->SetCause(cause.get()); 2463 } 2464 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2465 if (Runtime::Current()->IsCompiler()) { 2466 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2467 } 2468 klass->SetStatus(mirror::Class::kStatusError, self); 2469 return; 2470 } 2471 } 2472 2473 // Try to use verification information from the oat file, otherwise do runtime verification. 2474 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2475 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2476 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2477 if (oat_file_class_status == mirror::Class::kStatusError) { 2478 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2479 << PrettyDescriptor(klass.get()) << " in " 2480 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2481 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2482 PrettyDescriptor(klass.get()).c_str()); 2483 klass->SetStatus(mirror::Class::kStatusError, self); 2484 return; 2485 } 2486 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2487 std::string error_msg; 2488 if (!preverified) { 2489 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2490 Runtime::Current()->IsCompiler(), 2491 &error_msg); 2492 } 2493 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2494 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2495 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2496 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2497 << " because: " << error_msg; 2498 } 2499 self->AssertNoPendingException(); 2500 // Make sure all classes referenced by catch blocks are resolved. 2501 ResolveClassExceptionHandlerTypes(dex_file, klass); 2502 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2503 // Even though there were no verifier failures we need to respect whether the super-class 2504 // was verified or requiring runtime reverification. 2505 if (super.get() == NULL || super->IsVerified()) { 2506 klass->SetStatus(mirror::Class::kStatusVerified, self); 2507 } else { 2508 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2509 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2510 // Pretend a soft failure occured so that we don't consider the class verified below. 2511 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2512 } 2513 } else { 2514 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2515 // Soft failures at compile time should be retried at runtime. Soft 2516 // failures at runtime will be handled by slow paths in the generated 2517 // code. Set status accordingly. 2518 if (Runtime::Current()->IsCompiler()) { 2519 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2520 } else { 2521 klass->SetStatus(mirror::Class::kStatusVerified, self); 2522 } 2523 } 2524 } else { 2525 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2526 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2527 << " because: " << error_msg; 2528 self->AssertNoPendingException(); 2529 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2530 klass->SetStatus(mirror::Class::kStatusError, self); 2531 } 2532 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2533 // Class is verified so we don't need to do any access check on its methods. 2534 // Let the interpreter know it by setting the kAccPreverified flag onto each 2535 // method. 2536 // Note: we're going here during compilation and at runtime. When we set the 2537 // kAccPreverified flag when compiling image classes, the flag is recorded 2538 // in the image and is set when loading the image. 2539 klass->SetPreverifiedFlagOnAllMethods(); 2540 } 2541} 2542 2543bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2544 mirror::Class::Status& oat_file_class_status) { 2545 // If we're compiling, we can only verify the class using the oat file if 2546 // we are not compiling the image or if the class we're verifying is not part of 2547 // the app. In other words, we will only check for preverification of bootclasspath 2548 // classes. 2549 if (Runtime::Current()->IsCompiler()) { 2550 // Are we compiling the bootclasspath? 2551 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2552 return false; 2553 } 2554 // We are compiling an app (not the image). 2555 2556 // Is this an app class? (I.e. not a bootclasspath class) 2557 if (klass->GetClassLoader() != NULL) { 2558 return false; 2559 } 2560 } 2561 2562 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2563 // Make this work with gtests, which do not set up the image properly. 2564 // TODO: we should clean up gtests to set up the image path properly. 2565 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2566 return false; 2567 } 2568 2569 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2570 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2571 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2572 &dex_location_checksum); 2573 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2574 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2575 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2576 CHECK(oat_class.get() != NULL) 2577 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2578 << ClassHelper(klass).GetDescriptor(); 2579 oat_file_class_status = oat_class->GetStatus(); 2580 if (oat_file_class_status == mirror::Class::kStatusVerified || 2581 oat_file_class_status == mirror::Class::kStatusInitialized) { 2582 return true; 2583 } 2584 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2585 // Compile time verification failed with a soft error. Compile time verification can fail 2586 // because we have incomplete type information. Consider the following: 2587 // class ... { 2588 // Foo x; 2589 // .... () { 2590 // if (...) { 2591 // v1 gets assigned a type of resolved class Foo 2592 // } else { 2593 // v1 gets assigned a type of unresolved class Bar 2594 // } 2595 // iput x = v1 2596 // } } 2597 // when we merge v1 following the if-the-else it results in Conflict 2598 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2599 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2600 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2601 // at compile time). 2602 return false; 2603 } 2604 if (oat_file_class_status == mirror::Class::kStatusError) { 2605 // Compile time verification failed with a hard error. This is caused by invalid instructions 2606 // in the class. These errors are unrecoverable. 2607 return false; 2608 } 2609 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2610 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2611 // not loading the class. 2612 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2613 // isn't a problem and this case shouldn't occur 2614 return false; 2615 } 2616 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2617 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2618 << ClassHelper(klass).GetDescriptor(); 2619 2620 return false; 2621} 2622 2623void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2624 const SirtRef<mirror::Class>& klass) { 2625 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2626 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2627 } 2628 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2629 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2630 } 2631} 2632 2633void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2634 mirror::ArtMethod* method) { 2635 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2636 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2637 if (code_item == NULL) { 2638 return; // native or abstract method 2639 } 2640 if (code_item->tries_size_ == 0) { 2641 return; // nothing to process 2642 } 2643 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2644 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2645 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2646 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2647 CatchHandlerIterator iterator(handlers_ptr); 2648 for (; iterator.HasNext(); iterator.Next()) { 2649 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2650 // unresolved exception types will be ignored by exception delivery 2651 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2652 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2653 if (exception_type == NULL) { 2654 DCHECK(Thread::Current()->IsExceptionPending()); 2655 Thread::Current()->ClearException(); 2656 } 2657 } 2658 } 2659 handlers_ptr = iterator.EndDataPointer(); 2660 } 2661} 2662 2663static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2664static void CheckProxyMethod(mirror::ArtMethod* method, 2665 SirtRef<mirror::ArtMethod>& prototype); 2666 2667mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2668 jobjectArray interfaces, jobject loader, 2669 jobjectArray methods, jobjectArray throws) { 2670 Thread* self = soa.Self(); 2671 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2672 sizeof(mirror::SynthesizedProxyClass))); 2673 if (klass.get() == NULL) { 2674 CHECK(self->IsExceptionPending()); // OOME. 2675 return NULL; 2676 } 2677 DCHECK(klass->GetClass() != NULL); 2678 klass->SetObjectSize(sizeof(mirror::Proxy)); 2679 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2680 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2681 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2682 klass->SetName(soa.Decode<mirror::String*>(name)); 2683 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2684 klass->SetDexCache(proxy_class->GetDexCache()); 2685 klass->SetStatus(mirror::Class::kStatusIdx, self); 2686 2687 // Instance fields are inherited, but we add a couple of static fields... 2688 { 2689 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2690 if (UNLIKELY(sfields == NULL)) { 2691 CHECK(self->IsExceptionPending()); // OOME. 2692 return NULL; 2693 } 2694 klass->SetSFields(sfields); 2695 } 2696 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2697 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2698 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2699 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2700 CHECK(self->IsExceptionPending()); // OOME. 2701 return NULL; 2702 } 2703 klass->SetStaticField(0, interfaces_sfield.get()); 2704 interfaces_sfield->SetDexFieldIndex(0); 2705 interfaces_sfield->SetDeclaringClass(klass.get()); 2706 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2707 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2708 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2709 if (UNLIKELY(throws_sfield.get() == NULL)) { 2710 CHECK(self->IsExceptionPending()); // OOME. 2711 return NULL; 2712 } 2713 klass->SetStaticField(1, throws_sfield.get()); 2714 throws_sfield->SetDexFieldIndex(1); 2715 throws_sfield->SetDeclaringClass(klass.get()); 2716 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2717 2718 // Proxies have 1 direct method, the constructor 2719 { 2720 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2721 if (UNLIKELY(directs == NULL)) { 2722 CHECK(self->IsExceptionPending()); // OOME. 2723 return NULL; 2724 } 2725 klass->SetDirectMethods(directs); 2726 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2727 if (UNLIKELY(constructor == NULL)) { 2728 CHECK(self->IsExceptionPending()); // OOME. 2729 return NULL; 2730 } 2731 klass->SetDirectMethod(0, constructor); 2732 } 2733 2734 // Create virtual method using specified prototypes. 2735 size_t num_virtual_methods = 2736 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2737 { 2738 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2739 if (UNLIKELY(virtuals == NULL)) { 2740 CHECK(self->IsExceptionPending()); // OOME. 2741 return NULL; 2742 } 2743 klass->SetVirtualMethods(virtuals); 2744 } 2745 for (size_t i = 0; i < num_virtual_methods; ++i) { 2746 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2747 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2748 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2749 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2750 if (UNLIKELY(clone == NULL)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return NULL; 2753 } 2754 klass->SetVirtualMethod(i, clone); 2755 } 2756 2757 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2758 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2759 self->AssertNoPendingException(); 2760 2761 { 2762 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2763 // Link the fields and virtual methods, creating vtable and iftables 2764 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2765 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2766 if (!LinkClass(self, klass, sirt_interfaces)) { 2767 klass->SetStatus(mirror::Class::kStatusError, self); 2768 return nullptr; 2769 } 2770 2771 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2772 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2773 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2774 } 2775 2776 // sanity checks 2777 if (kIsDebugBuild) { 2778 CHECK(klass->GetIFields() == NULL); 2779 CheckProxyConstructor(klass->GetDirectMethod(0)); 2780 for (size_t i = 0; i < num_virtual_methods; ++i) { 2781 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2782 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2783 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2784 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2785 } 2786 2787 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2788 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2789 decoded_name->ToModifiedUtf8().c_str())); 2790 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2791 2792 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2793 decoded_name->ToModifiedUtf8().c_str())); 2794 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2795 2796 mirror::SynthesizedProxyClass* synth_proxy_class = 2797 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2798 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2799 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2800 } 2801 std::string descriptor(GetDescriptorForProxy(klass.get())); 2802 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2803 CHECK(existing == nullptr); 2804 return klass.get(); 2805} 2806 2807std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2808 DCHECK(proxy_class->IsProxyClass()); 2809 mirror::String* name = proxy_class->GetName(); 2810 DCHECK(name != NULL); 2811 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2812} 2813 2814mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2815 mirror::ArtMethod* proxy_method) { 2816 DCHECK(proxy_class->IsProxyClass()); 2817 DCHECK(proxy_method->IsProxyMethod()); 2818 // Locate the dex cache of the original interface/Object 2819 mirror::DexCache* dex_cache = NULL; 2820 { 2821 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2822 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2823 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2824 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2825 dex_cache = dex_caches_[i]; 2826 break; 2827 } 2828 } 2829 } 2830 CHECK(dex_cache != NULL); 2831 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2832 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2833 CHECK(resolved_method != NULL); 2834 return resolved_method; 2835} 2836 2837 2838mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2839 const SirtRef<mirror::Class>& klass, 2840 mirror::Class* proxy_class) { 2841 // Create constructor for Proxy that must initialize h 2842 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2843 proxy_class->GetDirectMethods(); 2844 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2845 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2846 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2847 // code_ too) 2848 mirror::ArtMethod* constructor = 2849 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2850 if (constructor == NULL) { 2851 CHECK(self->IsExceptionPending()); // OOME. 2852 return NULL; 2853 } 2854 // Make this constructor public and fix the class to be our Proxy version 2855 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2856 constructor->SetDeclaringClass(klass.get()); 2857 return constructor; 2858} 2859 2860static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2861 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2862 CHECK(constructor->IsConstructor()); 2863 MethodHelper mh(constructor); 2864 CHECK_STREQ(mh.GetName(), "<init>"); 2865 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2866 DCHECK(constructor->IsPublic()); 2867} 2868 2869mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2870 const SirtRef<mirror::Class>& klass, 2871 const SirtRef<mirror::ArtMethod>& prototype) { 2872 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2873 // prototype method 2874 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2875 prototype.get()); 2876 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2877 // as necessary 2878 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2879 if (UNLIKELY(method == NULL)) { 2880 CHECK(self->IsExceptionPending()); // OOME. 2881 return NULL; 2882 } 2883 2884 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2885 // the intersection of throw exceptions as defined in Proxy 2886 method->SetDeclaringClass(klass.get()); 2887 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2888 2889 // At runtime the method looks like a reference and argument saving method, clone the code 2890 // related parameters from this method. 2891 mirror::ArtMethod* refs_and_args = 2892 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2893 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2894 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2895 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2896 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2897 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2898 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2899 2900 return method; 2901} 2902 2903static void CheckProxyMethod(mirror::ArtMethod* method, 2904 SirtRef<mirror::ArtMethod>& prototype) 2905 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2906 // Basic sanity 2907 CHECK(!prototype->IsFinal()); 2908 CHECK(method->IsFinal()); 2909 CHECK(!method->IsAbstract()); 2910 2911 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2912 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2913 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2914 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2915 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2916 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2917 2918 MethodHelper mh(method); 2919 MethodHelper mh2(prototype.get()); 2920 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2921 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2922 // More complex sanity - via dex cache 2923 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2924} 2925 2926static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2927 bool can_init_parents) 2928 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2929 if (can_init_statics && can_init_parents) { 2930 return true; 2931 } 2932 if (!can_init_statics) { 2933 // Check if there's a class initializer. 2934 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2935 if (clinit != NULL) { 2936 return false; 2937 } 2938 // Check if there are encoded static values needing initialization. 2939 if (klass->NumStaticFields() != 0) { 2940 ClassHelper kh(klass); 2941 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2942 DCHECK(dex_class_def != NULL); 2943 if (dex_class_def->static_values_off_ != 0) { 2944 return false; 2945 } 2946 } 2947 } 2948 if (!klass->IsInterface() && klass->HasSuperClass()) { 2949 mirror::Class* super_class = klass->GetSuperClass(); 2950 if (!can_init_parents && !super_class->IsInitialized()) { 2951 return false; 2952 } else { 2953 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 2954 return false; 2955 } 2956 } 2957 } 2958 return true; 2959} 2960 2961bool ClassLinker::IsInitialized() const { 2962 return init_done_; 2963} 2964 2965bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 2966 bool can_init_parents) { 2967 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2968 2969 // Are we already initialized and therefore done? 2970 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2971 // an initialized class will never change its state. 2972 if (klass->IsInitialized()) { 2973 return true; 2974 } 2975 2976 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2977 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 2978 return false; 2979 } 2980 2981 Thread* self = Thread::Current(); 2982 uint64_t t0; 2983 { 2984 ObjectLock<mirror::Class> lock(self, &klass); 2985 2986 // Re-check under the lock in case another thread initialized ahead of us. 2987 if (klass->IsInitialized()) { 2988 return true; 2989 } 2990 2991 // Was the class already found to be erroneous? Done under the lock to match the JLS. 2992 if (klass->IsErroneous()) { 2993 ThrowEarlierClassFailure(klass.get()); 2994 return false; 2995 } 2996 2997 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 2998 2999 if (!klass->IsVerified()) { 3000 VerifyClass(klass); 3001 if (!klass->IsVerified()) { 3002 // We failed to verify, expect either the klass to be erroneous or verification failed at 3003 // compile time. 3004 if (klass->IsErroneous()) { 3005 CHECK(self->IsExceptionPending()); 3006 } else { 3007 CHECK(Runtime::Current()->IsCompiler()); 3008 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3009 } 3010 return false; 3011 } 3012 } 3013 3014 // If the class is kStatusInitializing, either this thread is 3015 // initializing higher up the stack or another thread has beat us 3016 // to initializing and we need to wait. Either way, this 3017 // invocation of InitializeClass will not be responsible for 3018 // running <clinit> and will return. 3019 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3020 // We caught somebody else in the act; was it us? 3021 if (klass->GetClinitThreadId() == self->GetTid()) { 3022 // Yes. That's fine. Return so we can continue initializing. 3023 return true; 3024 } 3025 // No. That's fine. Wait for another thread to finish initializing. 3026 return WaitForInitializeClass(klass, self, lock); 3027 } 3028 3029 if (!ValidateSuperClassDescriptors(klass)) { 3030 klass->SetStatus(mirror::Class::kStatusError, self); 3031 return false; 3032 } 3033 3034 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3035 3036 // From here out other threads may observe that we're initializing and so changes of state 3037 // require the a notification. 3038 klass->SetClinitThreadId(self->GetTid()); 3039 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3040 3041 t0 = NanoTime(); 3042 } 3043 3044 // Initialize super classes, must be done while initializing for the JLS. 3045 if (!klass->IsInterface() && klass->HasSuperClass()) { 3046 mirror::Class* super_class = klass->GetSuperClass(); 3047 if (!super_class->IsInitialized()) { 3048 CHECK(!super_class->IsInterface()); 3049 CHECK(can_init_parents); 3050 SirtRef<mirror::Class> sirt_super(self, super_class); 3051 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3052 if (!super_initialized) { 3053 // The super class was verified ahead of entering initializing, we should only be here if 3054 // the super class became erroneous due to initialization. 3055 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3056 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3057 << " that has unexpected status " << sirt_super->GetStatus() 3058 << "\nPending exception:\n" 3059 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3060 ObjectLock<mirror::Class> lock(self, &klass); 3061 // Initialization failed because the super-class is erroneous. 3062 klass->SetStatus(mirror::Class::kStatusError, self); 3063 return false; 3064 } 3065 } 3066 } 3067 3068 if (klass->NumStaticFields() > 0) { 3069 ClassHelper kh(klass.get()); 3070 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3071 CHECK(dex_class_def != NULL); 3072 const DexFile& dex_file = kh.GetDexFile(); 3073 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3074 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3075 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3076 this, *dex_class_def); 3077 if (it.HasNext()) { 3078 CHECK(can_init_statics); 3079 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3080 SafeMap<uint32_t, mirror::ArtField*> field_map; 3081 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3082 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3083 if (Runtime::Current()->IsActiveTransaction()) { 3084 it.ReadValueToField<true>(field_map.Get(i)); 3085 } else { 3086 it.ReadValueToField<false>(field_map.Get(i)); 3087 } 3088 } 3089 } 3090 } 3091 3092 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3093 if (clinit != NULL) { 3094 CHECK(can_init_statics); 3095 if (LIKELY(Runtime::Current()->IsStarted())) { 3096 JValue result; 3097 clinit->Invoke(self, NULL, 0, &result, "V"); 3098 } else { 3099 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3100 } 3101 } 3102 3103 uint64_t t1 = NanoTime(); 3104 3105 bool success = true; 3106 { 3107 ObjectLock<mirror::Class> lock(self, &klass); 3108 3109 if (self->IsExceptionPending()) { 3110 WrapExceptionInInitializer(); 3111 klass->SetStatus(mirror::Class::kStatusError, self); 3112 success = false; 3113 } else { 3114 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3115 RuntimeStats* thread_stats = self->GetStats(); 3116 ++global_stats->class_init_count; 3117 ++thread_stats->class_init_count; 3118 global_stats->class_init_time_ns += (t1 - t0); 3119 thread_stats->class_init_time_ns += (t1 - t0); 3120 // Set the class as initialized except if failed to initialize static fields. 3121 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3122 if (VLOG_IS_ON(class_linker)) { 3123 ClassHelper kh(klass.get()); 3124 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3125 } 3126 // Opportunistically set static method trampolines to their destination. 3127 FixupStaticTrampolines(klass.get()); 3128 } 3129 } 3130 return success; 3131} 3132 3133bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3134 ObjectLock<mirror::Class>& lock) 3135 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3136 while (true) { 3137 self->AssertNoPendingException(); 3138 CHECK(!klass->IsInitialized()); 3139 lock.WaitIgnoringInterrupts(); 3140 3141 // When we wake up, repeat the test for init-in-progress. If 3142 // there's an exception pending (only possible if 3143 // "interruptShouldThrow" was set), bail out. 3144 if (self->IsExceptionPending()) { 3145 WrapExceptionInInitializer(); 3146 klass->SetStatus(mirror::Class::kStatusError, self); 3147 return false; 3148 } 3149 // Spurious wakeup? Go back to waiting. 3150 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3151 continue; 3152 } 3153 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3154 // Compile time initialization failed. 3155 return false; 3156 } 3157 if (klass->IsErroneous()) { 3158 // The caller wants an exception, but it was thrown in a 3159 // different thread. Synthesize one here. 3160 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3161 PrettyDescriptor(klass.get()).c_str()); 3162 return false; 3163 } 3164 if (klass->IsInitialized()) { 3165 return true; 3166 } 3167 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3168 << klass->GetStatus(); 3169 } 3170 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3171} 3172 3173bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3174 if (klass->IsInterface()) { 3175 return true; 3176 } 3177 Thread* self = Thread::Current(); 3178 // begin with the methods local to the superclass 3179 if (klass->HasSuperClass() && 3180 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3181 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3182 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3183 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3184 if (method != super->GetVTable()->Get(i) && 3185 !IsSameMethodSignatureInDifferentClassContexts(method, super.get(), klass.get())) { 3186 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3187 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3188 PrettyDescriptor(super.get()).c_str()); 3189 return false; 3190 } 3191 } 3192 } 3193 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3194 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3195 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3196 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3197 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3198 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface.get(), 3199 method->GetDeclaringClass())) { 3200 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3201 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3202 PrettyMethod(method).c_str(), 3203 PrettyDescriptor(interface.get()).c_str()); 3204 return false; 3205 } 3206 } 3207 } 3208 } 3209 return true; 3210} 3211 3212// Returns true if classes referenced by the signature of the method are the 3213// same classes in klass1 as they are in klass2. 3214bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(mirror::ArtMethod* method, 3215 mirror::Class* klass1, 3216 mirror::Class* klass2) { 3217 if (klass1 == klass2) { 3218 return true; 3219 } 3220 Thread* self = Thread::Current(); 3221 CHECK(klass1 != nullptr); 3222 CHECK(klass2 != nullptr); 3223 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3224 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3225 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3226 const DexFile::ProtoId& proto_id = 3227 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3228 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3229 const char* descriptor = it.GetDescriptor(); 3230 if (descriptor == nullptr) { 3231 break; 3232 } 3233 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3234 // Found a non-primitive type. 3235 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3236 return false; 3237 } 3238 } 3239 } 3240 // Check the return type 3241 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3242 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3243 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3244 return false; 3245 } 3246 } 3247 return true; 3248} 3249 3250// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3251bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3252 SirtRef<mirror::ClassLoader>& loader1, 3253 SirtRef<mirror::ClassLoader>& loader2) { 3254 CHECK(descriptor != nullptr); 3255 Thread* self = Thread::Current(); 3256 SirtRef<mirror::Class> found1(self, FindClass(descriptor, loader1)); 3257 if (found1.get() == nullptr) { 3258 self->ClearException(); 3259 } 3260 mirror::Class* found2 = FindClass(descriptor, loader2); 3261 if (found2 == nullptr) { 3262 self->ClearException(); 3263 } 3264 return found1.get() == found2; 3265} 3266 3267bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3268 bool can_init_parents) { 3269 DCHECK(c.get() != NULL); 3270 if (c->IsInitialized()) { 3271 return true; 3272 } 3273 3274 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3275 if (!success) { 3276 if (can_init_fields && can_init_parents) { 3277 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3278 } 3279 } 3280 return success; 3281} 3282 3283void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3284 mirror::Class* c, 3285 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3286 const byte* class_data = dex_file.GetClassData(dex_class_def); 3287 ClassDataItemIterator it(dex_file, class_data); 3288 Thread* self = Thread::Current(); 3289 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3290 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3291 CHECK(!kMovingFields); 3292 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3293 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3294 } 3295} 3296 3297bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3298 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3299 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3300 if (!LinkSuperClass(klass)) { 3301 return false; 3302 } 3303 if (!LinkMethods(klass, interfaces)) { 3304 return false; 3305 } 3306 if (!LinkInstanceFields(klass)) { 3307 return false; 3308 } 3309 if (!LinkStaticFields(klass)) { 3310 return false; 3311 } 3312 CreateReferenceInstanceOffsets(klass); 3313 CreateReferenceStaticOffsets(klass); 3314 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3315 klass->SetStatus(mirror::Class::kStatusResolved, self); 3316 return true; 3317} 3318 3319bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3320 const DexFile& dex_file) { 3321 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3322 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3323 uint16_t super_class_idx = class_def.superclass_idx_; 3324 if (super_class_idx != DexFile::kDexNoIndex16) { 3325 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3326 if (super_class == NULL) { 3327 DCHECK(Thread::Current()->IsExceptionPending()); 3328 return false; 3329 } 3330 // Verify 3331 if (!klass->CanAccess(super_class)) { 3332 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3333 PrettyDescriptor(super_class).c_str(), 3334 PrettyDescriptor(klass.get()).c_str()); 3335 return false; 3336 } 3337 klass->SetSuperClass(super_class); 3338 } 3339 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3340 if (interfaces != NULL) { 3341 for (size_t i = 0; i < interfaces->Size(); i++) { 3342 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3343 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3344 if (interface == NULL) { 3345 DCHECK(Thread::Current()->IsExceptionPending()); 3346 return false; 3347 } 3348 // Verify 3349 if (!klass->CanAccess(interface)) { 3350 // TODO: the RI seemed to ignore this in my testing. 3351 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3352 PrettyDescriptor(interface).c_str(), 3353 PrettyDescriptor(klass.get()).c_str()); 3354 return false; 3355 } 3356 } 3357 } 3358 // Mark the class as loaded. 3359 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3360 return true; 3361} 3362 3363bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3364 CHECK(!klass->IsPrimitive()); 3365 mirror::Class* super = klass->GetSuperClass(); 3366 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3367 if (super != NULL) { 3368 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3369 return false; 3370 } 3371 return true; 3372 } 3373 if (super == NULL) { 3374 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3375 PrettyDescriptor(klass.get()).c_str()); 3376 return false; 3377 } 3378 // Verify 3379 if (super->IsFinal() || super->IsInterface()) { 3380 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3381 PrettyDescriptor(super).c_str(), 3382 PrettyDescriptor(klass.get()).c_str(), 3383 super->IsFinal() ? "declared final" : "an interface"); 3384 return false; 3385 } 3386 if (!klass->CanAccess(super)) { 3387 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3388 PrettyDescriptor(super).c_str(), 3389 PrettyDescriptor(klass.get()).c_str()); 3390 return false; 3391 } 3392 3393 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3394 if (super->IsFinalizable()) { 3395 klass->SetFinalizable(); 3396 } 3397 3398 // Inherit reference flags (if any) from the superclass. 3399 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3400 if (reference_flags != 0) { 3401 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3402 } 3403 // Disallow custom direct subclasses of java.lang.ref.Reference. 3404 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3405 ThrowLinkageError(klass.get(), 3406 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3407 PrettyDescriptor(klass.get()).c_str()); 3408 return false; 3409 } 3410 3411 if (kIsDebugBuild) { 3412 // Ensure super classes are fully resolved prior to resolving fields.. 3413 while (super != NULL) { 3414 CHECK(super->IsResolved()); 3415 super = super->GetSuperClass(); 3416 } 3417 } 3418 return true; 3419} 3420 3421// Populate the class vtable and itable. Compute return type indices. 3422bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3423 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3424 if (klass->IsInterface()) { 3425 // No vtable. 3426 size_t count = klass->NumVirtualMethods(); 3427 if (!IsUint(16, count)) { 3428 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3429 return false; 3430 } 3431 for (size_t i = 0; i < count; ++i) { 3432 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3433 } 3434 // Link interface method tables 3435 return LinkInterfaceMethods(klass, interfaces); 3436 } else { 3437 // Link virtual and interface method tables 3438 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3439 } 3440 return true; 3441} 3442 3443bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3444 Thread* self = Thread::Current(); 3445 if (klass->HasSuperClass()) { 3446 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3447 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3448 CHECK_LE(actual_count, max_count); 3449 // TODO: do not assign to the vtable field until it is fully constructed. 3450 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3451 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3452 if (UNLIKELY(vtable.get() == NULL)) { 3453 CHECK(self->IsExceptionPending()); // OOME. 3454 return false; 3455 } 3456 // See if any of our virtual methods override the superclass. 3457 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3458 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3459 MethodHelper local_mh(local_method); 3460 size_t j = 0; 3461 for (; j < actual_count; ++j) { 3462 mirror::ArtMethod* super_method = vtable->Get(j); 3463 MethodHelper super_mh(super_method); 3464 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3465 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3466 if (super_method->IsFinal()) { 3467 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3468 PrettyMethod(local_method).c_str(), 3469 super_mh.GetDeclaringClassDescriptor()); 3470 return false; 3471 } 3472 vtable->Set<false>(j, local_method); 3473 local_method->SetMethodIndex(j); 3474 break; 3475 } else { 3476 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3477 << " would have incorrectly overridden the package-private method in " 3478 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3479 } 3480 } 3481 } 3482 if (j == actual_count) { 3483 // Not overriding, append. 3484 vtable->Set<false>(actual_count, local_method); 3485 local_method->SetMethodIndex(actual_count); 3486 actual_count += 1; 3487 } 3488 } 3489 if (!IsUint(16, actual_count)) { 3490 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3491 return false; 3492 } 3493 // Shrink vtable if possible 3494 CHECK_LE(actual_count, max_count); 3495 if (actual_count < max_count) { 3496 vtable.reset(vtable->CopyOf(self, actual_count)); 3497 if (UNLIKELY(vtable.get() == NULL)) { 3498 CHECK(self->IsExceptionPending()); // OOME. 3499 return false; 3500 } 3501 } 3502 klass->SetVTable(vtable.get()); 3503 } else { 3504 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3505 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3506 if (!IsUint(16, num_virtual_methods)) { 3507 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3508 return false; 3509 } 3510 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3511 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3512 if (UNLIKELY(vtable.get() == NULL)) { 3513 CHECK(self->IsExceptionPending()); // OOME. 3514 return false; 3515 } 3516 for (size_t i = 0; i < num_virtual_methods; ++i) { 3517 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3518 vtable->Set<false>(i, virtual_method); 3519 virtual_method->SetMethodIndex(i & 0xFFFF); 3520 } 3521 klass->SetVTable(vtable.get()); 3522 } 3523 return true; 3524} 3525 3526bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3527 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3528 // Set the imt table to be all conflicts by default. 3529 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3530 size_t super_ifcount; 3531 if (klass->HasSuperClass()) { 3532 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3533 } else { 3534 super_ifcount = 0; 3535 } 3536 size_t ifcount = super_ifcount; 3537 uint32_t num_interfaces; 3538 { 3539 ClassHelper kh(klass.get()); 3540 num_interfaces = 3541 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3542 ifcount += num_interfaces; 3543 for (size_t i = 0; i < num_interfaces; i++) { 3544 mirror::Class* interface = 3545 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3546 ifcount += interface->GetIfTableCount(); 3547 } 3548 } 3549 if (ifcount == 0) { 3550 // Class implements no interfaces. 3551 DCHECK_EQ(klass->GetIfTableCount(), 0); 3552 DCHECK(klass->GetIfTable() == NULL); 3553 return true; 3554 } 3555 if (ifcount == super_ifcount) { 3556 // Class implements same interfaces as parent, are any of these not marker interfaces? 3557 bool has_non_marker_interface = false; 3558 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3559 for (size_t i = 0; i < ifcount; ++i) { 3560 if (super_iftable->GetMethodArrayCount(i) > 0) { 3561 has_non_marker_interface = true; 3562 break; 3563 } 3564 } 3565 if (!has_non_marker_interface) { 3566 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3567 klass->SetIfTable(super_iftable); 3568 return true; 3569 } 3570 } 3571 Thread* self = Thread::Current(); 3572 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3573 if (UNLIKELY(iftable.get() == NULL)) { 3574 CHECK(self->IsExceptionPending()); // OOME. 3575 return false; 3576 } 3577 if (super_ifcount != 0) { 3578 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3579 for (size_t i = 0; i < super_ifcount; i++) { 3580 mirror::Class* super_interface = super_iftable->GetInterface(i); 3581 iftable->SetInterface(i, super_interface); 3582 } 3583 } 3584 // Flatten the interface inheritance hierarchy. 3585 size_t idx = super_ifcount; 3586 for (size_t i = 0; i < num_interfaces; i++) { 3587 ClassHelper kh(klass.get()); 3588 mirror::Class* interface = 3589 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3590 DCHECK(interface != NULL); 3591 if (!interface->IsInterface()) { 3592 ClassHelper ih(interface); 3593 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3594 PrettyDescriptor(klass.get()).c_str(), 3595 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3596 return false; 3597 } 3598 // Check if interface is already in iftable 3599 bool duplicate = false; 3600 for (size_t j = 0; j < idx; j++) { 3601 mirror::Class* existing_interface = iftable->GetInterface(j); 3602 if (existing_interface == interface) { 3603 duplicate = true; 3604 break; 3605 } 3606 } 3607 if (!duplicate) { 3608 // Add this non-duplicate interface. 3609 iftable->SetInterface(idx++, interface); 3610 // Add this interface's non-duplicate super-interfaces. 3611 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3612 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3613 bool super_duplicate = false; 3614 for (size_t k = 0; k < idx; k++) { 3615 mirror::Class* existing_interface = iftable->GetInterface(k); 3616 if (existing_interface == super_interface) { 3617 super_duplicate = true; 3618 break; 3619 } 3620 } 3621 if (!super_duplicate) { 3622 iftable->SetInterface(idx++, super_interface); 3623 } 3624 } 3625 } 3626 } 3627 // Shrink iftable in case duplicates were found 3628 if (idx < ifcount) { 3629 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3630 if (UNLIKELY(iftable.get() == NULL)) { 3631 CHECK(self->IsExceptionPending()); // OOME. 3632 return false; 3633 } 3634 ifcount = idx; 3635 } else { 3636 CHECK_EQ(idx, ifcount); 3637 } 3638 klass->SetIfTable(iftable.get()); 3639 3640 // If we're an interface, we don't need the vtable pointers, so we're done. 3641 if (klass->IsInterface()) { 3642 return true; 3643 } 3644 // Allocate imtable 3645 bool imtable_changed = false; 3646 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3647 if (UNLIKELY(imtable.get() == NULL)) { 3648 CHECK(self->IsExceptionPending()); // OOME. 3649 return false; 3650 } 3651 std::vector<mirror::ArtMethod*> miranda_list; 3652 for (size_t i = 0; i < ifcount; ++i) { 3653 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3654 if (num_methods > 0) { 3655 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3656 method_array(self, AllocArtMethodArray(self, num_methods)); 3657 if (UNLIKELY(method_array.get() == nullptr)) { 3658 CHECK(self->IsExceptionPending()); // OOME. 3659 return false; 3660 } 3661 iftable->SetMethodArray(i, method_array.get()); 3662 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3663 klass->GetVTableDuringLinking()); 3664 for (size_t j = 0; j < num_methods; ++j) { 3665 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3666 MethodHelper interface_mh(interface_method); 3667 int32_t k; 3668 // For each method listed in the interface's method list, find the 3669 // matching method in our class's method list. We want to favor the 3670 // subclass over the superclass, which just requires walking 3671 // back from the end of the vtable. (This only matters if the 3672 // superclass defines a private method and this class redefines 3673 // it -- otherwise it would use the same vtable slot. In .dex files 3674 // those don't end up in the virtual method table, so it shouldn't 3675 // matter which direction we go. We walk it backward anyway.) 3676 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3677 mirror::ArtMethod* vtable_method = vtable->Get(k); 3678 MethodHelper vtable_mh(vtable_method); 3679 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3680 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3681 ThrowIllegalAccessError(klass.get(), 3682 "Method '%s' implementing interface method '%s' is not public", 3683 PrettyMethod(vtable_method).c_str(), 3684 PrettyMethod(interface_method).c_str()); 3685 return false; 3686 } 3687 method_array->Set<false>(j, vtable_method); 3688 // Place method in imt if entry is empty, place conflict otherwise. 3689 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3690 if (imtable->Get(imt_index) == NULL) { 3691 imtable->Set<false>(imt_index, vtable_method); 3692 imtable_changed = true; 3693 } else { 3694 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3695 } 3696 break; 3697 } 3698 } 3699 if (k < 0) { 3700 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3701 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3702 mirror::ArtMethod* mir_method = miranda_list[mir]; 3703 MethodHelper vtable_mh(mir_method); 3704 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3705 miranda_method.reset(miranda_list[mir]); 3706 break; 3707 } 3708 } 3709 if (miranda_method.get() == NULL) { 3710 // Point the interface table at a phantom slot. 3711 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3712 if (UNLIKELY(miranda_method.get() == NULL)) { 3713 CHECK(self->IsExceptionPending()); // OOME. 3714 return false; 3715 } 3716 // TODO: If a methods move then the miranda_list may hold stale references. 3717 miranda_list.push_back(miranda_method.get()); 3718 } 3719 method_array->Set<false>(j, miranda_method.get()); 3720 } 3721 } 3722 } 3723 } 3724 if (imtable_changed) { 3725 // Fill in empty entries in interface method table with conflict. 3726 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3727 for (size_t i = 0; i < kImtSize; i++) { 3728 if (imtable->Get(i) == NULL) { 3729 imtable->Set<false>(i, imt_conflict_method); 3730 } 3731 } 3732 klass->SetImTable(imtable.get()); 3733 } 3734 if (!miranda_list.empty()) { 3735 int old_method_count = klass->NumVirtualMethods(); 3736 int new_method_count = old_method_count + miranda_list.size(); 3737 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3738 if (old_method_count == 0) { 3739 virtuals = AllocArtMethodArray(self, new_method_count); 3740 } else { 3741 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3742 } 3743 if (UNLIKELY(virtuals == NULL)) { 3744 CHECK(self->IsExceptionPending()); // OOME. 3745 return false; 3746 } 3747 klass->SetVirtualMethods(virtuals); 3748 3749 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3750 vtable(self, klass->GetVTableDuringLinking()); 3751 CHECK(vtable.get() != NULL); 3752 int old_vtable_count = vtable->GetLength(); 3753 int new_vtable_count = old_vtable_count + miranda_list.size(); 3754 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3755 if (UNLIKELY(vtable.get() == NULL)) { 3756 CHECK(self->IsExceptionPending()); // OOME. 3757 return false; 3758 } 3759 for (size_t i = 0; i < miranda_list.size(); ++i) { 3760 mirror::ArtMethod* method = miranda_list[i]; 3761 // Leave the declaring class alone as type indices are relative to it 3762 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3763 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3764 klass->SetVirtualMethod(old_method_count + i, method); 3765 vtable->Set<false>(old_vtable_count + i, method); 3766 } 3767 // TODO: do not assign to the vtable field until it is fully constructed. 3768 klass->SetVTable(vtable.get()); 3769 } 3770 3771 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3772 for (int i = 0; i < vtable->GetLength(); ++i) { 3773 CHECK(vtable->Get(i) != NULL); 3774 } 3775 3776// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3777 3778 return true; 3779} 3780 3781bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3782 CHECK(klass.get() != NULL); 3783 return LinkFields(klass, false); 3784} 3785 3786bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3787 CHECK(klass.get() != NULL); 3788 size_t allocated_class_size = klass->GetClassSize(); 3789 bool success = LinkFields(klass, true); 3790 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3791 return success; 3792} 3793 3794struct LinkFieldsComparator { 3795 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3796 } 3797 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3798 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3799 NO_THREAD_SAFETY_ANALYSIS { 3800 // First come reference fields, then 64-bit, and finally 32-bit 3801 FieldHelper fh1(field1); 3802 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3803 FieldHelper fh2(field2); 3804 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3805 if (type1 != type2) { 3806 bool is_primitive1 = type1 != Primitive::kPrimNot; 3807 bool is_primitive2 = type2 != Primitive::kPrimNot; 3808 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3809 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3810 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3811 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3812 if (order1 != order2) { 3813 return order1 < order2; 3814 } 3815 } 3816 // same basic group? then sort by string. 3817 const char* name1 = fh1.GetName(); 3818 const char* name2 = fh2.GetName(); 3819 return strcmp(name1, name2) < 0; 3820 } 3821}; 3822 3823bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3824 size_t num_fields = 3825 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3826 3827 mirror::ObjectArray<mirror::ArtField>* fields = 3828 is_static ? klass->GetSFields() : klass->GetIFields(); 3829 3830 // Initialize size and field_offset 3831 size_t size; 3832 MemberOffset field_offset(0); 3833 if (is_static) { 3834 size = klass->GetClassSize(); 3835 field_offset = mirror::Class::FieldsOffset(); 3836 } else { 3837 mirror::Class* super_class = klass->GetSuperClass(); 3838 if (super_class != NULL) { 3839 CHECK(super_class->IsResolved()); 3840 field_offset = MemberOffset(super_class->GetObjectSize()); 3841 } 3842 size = field_offset.Uint32Value(); 3843 } 3844 3845 CHECK_EQ(num_fields == 0, fields == NULL); 3846 3847 // we want a relatively stable order so that adding new fields 3848 // minimizes disruption of C++ version such as Class and Method. 3849 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3850 for (size_t i = 0; i < num_fields; i++) { 3851 mirror::ArtField* f = fields->Get(i); 3852 CHECK(f != NULL); 3853 grouped_and_sorted_fields.push_back(f); 3854 } 3855 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3856 LinkFieldsComparator()); 3857 3858 // References should be at the front. 3859 size_t current_field = 0; 3860 size_t num_reference_fields = 0; 3861 for (; current_field < num_fields; current_field++) { 3862 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3863 FieldHelper fh(field); 3864 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3865 bool isPrimitive = type != Primitive::kPrimNot; 3866 if (isPrimitive) { 3867 break; // past last reference, move on to the next phase 3868 } 3869 grouped_and_sorted_fields.pop_front(); 3870 num_reference_fields++; 3871 fields->Set<false>(current_field, field); 3872 field->SetOffset(field_offset); 3873 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3874 } 3875 3876 // Now we want to pack all of the double-wide fields together. If 3877 // we're not aligned, though, we want to shuffle one 32-bit field 3878 // into place. If we can't find one, we'll have to pad it. 3879 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3880 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3881 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3882 FieldHelper fh(field); 3883 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3884 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3885 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3886 continue; 3887 } 3888 fields->Set<false>(current_field++, field); 3889 field->SetOffset(field_offset); 3890 // drop the consumed field 3891 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3892 break; 3893 } 3894 // whether we found a 32-bit field for padding or not, we advance 3895 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3896 } 3897 3898 // Alignment is good, shuffle any double-wide fields forward, and 3899 // finish assigning field offsets to all fields. 3900 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3901 while (!grouped_and_sorted_fields.empty()) { 3902 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3903 grouped_and_sorted_fields.pop_front(); 3904 FieldHelper fh(field); 3905 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3906 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3907 fields->Set<false>(current_field, field); 3908 field->SetOffset(field_offset); 3909 field_offset = MemberOffset(field_offset.Uint32Value() + 3910 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3911 ? sizeof(uint64_t) 3912 : sizeof(uint32_t))); 3913 current_field++; 3914 } 3915 3916 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3917 if (!is_static && 3918 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3919 // We know there are no non-reference fields in the Reference classes, and we know 3920 // that 'referent' is alphabetically last, so this is easy... 3921 CHECK_EQ(num_reference_fields, num_fields); 3922 FieldHelper fh(fields->Get(num_fields - 1)); 3923 CHECK_STREQ(fh.GetName(), "referent"); 3924 --num_reference_fields; 3925 } 3926 3927 if (kIsDebugBuild) { 3928 // Make sure that all reference fields appear before 3929 // non-reference fields, and all double-wide fields are aligned. 3930 bool seen_non_ref = false; 3931 for (size_t i = 0; i < num_fields; i++) { 3932 mirror::ArtField* field = fields->Get(i); 3933 if (false) { // enable to debug field layout 3934 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3935 << " class=" << PrettyClass(klass.get()) 3936 << " field=" << PrettyField(field) 3937 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3938 false); 3939 } 3940 FieldHelper fh(field); 3941 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3942 bool is_primitive = type != Primitive::kPrimNot; 3943 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 3944 && (strcmp("referent", fh.GetName()) == 0)) { 3945 is_primitive = true; // We lied above, so we have to expect a lie here. 3946 } 3947 if (is_primitive) { 3948 if (!seen_non_ref) { 3949 seen_non_ref = true; 3950 DCHECK_EQ(num_reference_fields, i); 3951 } 3952 } else { 3953 DCHECK(!seen_non_ref); 3954 } 3955 } 3956 if (!seen_non_ref) { 3957 DCHECK_EQ(num_fields, num_reference_fields); 3958 } 3959 } 3960 size = field_offset.Uint32Value(); 3961 // Update klass 3962 if (is_static) { 3963 klass->SetNumReferenceStaticFields(num_reference_fields); 3964 klass->SetClassSize(size); 3965 } else { 3966 klass->SetNumReferenceInstanceFields(num_reference_fields); 3967 if (!klass->IsVariableSize()) { 3968 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 3969 size_t previous_size = klass->GetObjectSize(); 3970 if (previous_size != 0) { 3971 // Make sure that we didn't originally have an incorrect size. 3972 CHECK_EQ(previous_size, size); 3973 } 3974 klass->SetObjectSize(size); 3975 } 3976 } 3977 return true; 3978} 3979 3980// Set the bitmap of reference offsets, refOffsets, from the ifields 3981// list. 3982void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 3983 uint32_t reference_offsets = 0; 3984 mirror::Class* super_class = klass->GetSuperClass(); 3985 if (super_class != NULL) { 3986 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3987 // If our superclass overflowed, we don't stand a chance. 3988 if (reference_offsets == CLASS_WALK_SUPER) { 3989 klass->SetReferenceInstanceOffsets(reference_offsets); 3990 return; 3991 } 3992 } 3993 CreateReferenceOffsets(klass, false, reference_offsets); 3994} 3995 3996void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 3997 CreateReferenceOffsets(klass, true, 0); 3998} 3999 4000void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4001 uint32_t reference_offsets) { 4002 size_t num_reference_fields = 4003 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4004 : klass->NumReferenceInstanceFieldsDuringLinking(); 4005 mirror::ObjectArray<mirror::ArtField>* fields = 4006 is_static ? klass->GetSFields() : klass->GetIFields(); 4007 // All of the fields that contain object references are guaranteed 4008 // to be at the beginning of the fields list. 4009 for (size_t i = 0; i < num_reference_fields; ++i) { 4010 // Note that byte_offset is the offset from the beginning of 4011 // object, not the offset into instance data 4012 mirror::ArtField* field = fields->Get(i); 4013 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4014 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4015 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4016 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4017 CHECK_NE(new_bit, 0U); 4018 reference_offsets |= new_bit; 4019 } else { 4020 reference_offsets = CLASS_WALK_SUPER; 4021 break; 4022 } 4023 } 4024 // Update fields in klass 4025 if (is_static) { 4026 klass->SetReferenceStaticOffsets(reference_offsets); 4027 } else { 4028 klass->SetReferenceInstanceOffsets(reference_offsets); 4029 } 4030} 4031 4032mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4033 const SirtRef<mirror::DexCache>& dex_cache) { 4034 DCHECK(dex_cache.get() != nullptr); 4035 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4036 if (resolved != NULL) { 4037 return resolved; 4038 } 4039 uint32_t utf16_length; 4040 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4041 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4042 dex_cache->SetResolvedString(string_idx, string); 4043 return string; 4044} 4045 4046mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4047 mirror::Class* referrer) { 4048 Thread* self = Thread::Current(); 4049 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4050 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4051 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4052} 4053 4054mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4055 const SirtRef<mirror::DexCache>& dex_cache, 4056 const SirtRef<mirror::ClassLoader>& class_loader) { 4057 DCHECK(dex_cache.get() != NULL); 4058 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4059 if (resolved == NULL) { 4060 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4061 resolved = FindClass(descriptor, class_loader); 4062 if (resolved != NULL) { 4063 // TODO: we used to throw here if resolved's class loader was not the 4064 // boot class loader. This was to permit different classes with the 4065 // same name to be loaded simultaneously by different loaders 4066 dex_cache->SetResolvedType(type_idx, resolved); 4067 } else { 4068 Thread* self = Thread::Current(); 4069 CHECK(self->IsExceptionPending()) 4070 << "Expected pending exception for failed resolution of: " << descriptor; 4071 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4072 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4073 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4074 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4075 Thread::Current()->ClearException(); 4076 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4077 self->GetException(NULL)->SetCause(cause.get()); 4078 } 4079 } 4080 } 4081 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4082 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4083 return resolved; 4084} 4085 4086mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4087 uint32_t method_idx, 4088 const SirtRef<mirror::DexCache>& dex_cache, 4089 const SirtRef<mirror::ClassLoader>& class_loader, 4090 mirror::ArtMethod* referrer, 4091 InvokeType type) { 4092 DCHECK(dex_cache.get() != NULL); 4093 // Check for hit in the dex cache. 4094 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4095 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4096 return resolved; 4097 } 4098 // Fail, get the declaring class. 4099 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4100 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4101 if (klass == NULL) { 4102 DCHECK(Thread::Current()->IsExceptionPending()); 4103 return NULL; 4104 } 4105 // Scan using method_idx, this saves string compares but will only hit for matching dex 4106 // caches/files. 4107 switch (type) { 4108 case kDirect: // Fall-through. 4109 case kStatic: 4110 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4111 break; 4112 case kInterface: 4113 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4114 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4115 break; 4116 case kSuper: // Fall-through. 4117 case kVirtual: 4118 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4119 break; 4120 default: 4121 LOG(FATAL) << "Unreachable - invocation type: " << type; 4122 } 4123 if (resolved == NULL) { 4124 // Search by name, which works across dex files. 4125 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4126 const Signature signature = dex_file.GetMethodSignature(method_id); 4127 switch (type) { 4128 case kDirect: // Fall-through. 4129 case kStatic: 4130 resolved = klass->FindDirectMethod(name, signature); 4131 break; 4132 case kInterface: 4133 resolved = klass->FindInterfaceMethod(name, signature); 4134 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4135 break; 4136 case kSuper: // Fall-through. 4137 case kVirtual: 4138 resolved = klass->FindVirtualMethod(name, signature); 4139 break; 4140 } 4141 } 4142 if (resolved != NULL) { 4143 // We found a method, check for incompatible class changes. 4144 if (resolved->CheckIncompatibleClassChange(type)) { 4145 resolved = NULL; 4146 } 4147 } 4148 if (resolved != NULL) { 4149 // Be a good citizen and update the dex cache to speed subsequent calls. 4150 dex_cache->SetResolvedMethod(method_idx, resolved); 4151 return resolved; 4152 } else { 4153 // We failed to find the method which means either an access error, an incompatible class 4154 // change, or no such method. First try to find the method among direct and virtual methods. 4155 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4156 const Signature signature = dex_file.GetMethodSignature(method_id); 4157 switch (type) { 4158 case kDirect: 4159 case kStatic: 4160 resolved = klass->FindVirtualMethod(name, signature); 4161 break; 4162 case kInterface: 4163 case kVirtual: 4164 case kSuper: 4165 resolved = klass->FindDirectMethod(name, signature); 4166 break; 4167 } 4168 4169 // If we found something, check that it can be accessed by the referrer. 4170 if (resolved != NULL && referrer != NULL) { 4171 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4172 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4173 if (!referring_class->CanAccess(methods_class)) { 4174 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4175 resolved, type); 4176 return NULL; 4177 } else if (!referring_class->CanAccessMember(methods_class, 4178 resolved->GetAccessFlags())) { 4179 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4180 return NULL; 4181 } 4182 } 4183 4184 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4185 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4186 switch (type) { 4187 case kDirect: 4188 case kStatic: 4189 if (resolved != NULL) { 4190 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4191 } else { 4192 resolved = klass->FindInterfaceMethod(name, signature); 4193 if (resolved != NULL) { 4194 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4195 } else { 4196 ThrowNoSuchMethodError(type, klass, name, signature); 4197 } 4198 } 4199 break; 4200 case kInterface: 4201 if (resolved != NULL) { 4202 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4203 } else { 4204 resolved = klass->FindVirtualMethod(name, signature); 4205 if (resolved != NULL) { 4206 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4207 } else { 4208 ThrowNoSuchMethodError(type, klass, name, signature); 4209 } 4210 } 4211 break; 4212 case kSuper: 4213 ThrowNoSuchMethodError(type, klass, name, signature); 4214 break; 4215 case kVirtual: 4216 if (resolved != NULL) { 4217 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4218 } else { 4219 resolved = klass->FindInterfaceMethod(name, signature); 4220 if (resolved != NULL) { 4221 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4222 } else { 4223 ThrowNoSuchMethodError(type, klass, name, signature); 4224 } 4225 } 4226 break; 4227 } 4228 DCHECK(Thread::Current()->IsExceptionPending()); 4229 return NULL; 4230 } 4231} 4232 4233mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4234 const SirtRef<mirror::DexCache>& dex_cache, 4235 const SirtRef<mirror::ClassLoader>& class_loader, 4236 bool is_static) { 4237 DCHECK(dex_cache.get() != nullptr); 4238 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4239 if (resolved != NULL) { 4240 return resolved; 4241 } 4242 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4243 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4244 if (klass == NULL) { 4245 DCHECK(Thread::Current()->IsExceptionPending()); 4246 return NULL; 4247 } 4248 4249 if (is_static) { 4250 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4251 } else { 4252 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4253 } 4254 4255 if (resolved == NULL) { 4256 const char* name = dex_file.GetFieldName(field_id); 4257 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4258 if (is_static) { 4259 resolved = klass->FindStaticField(name, type); 4260 } else { 4261 resolved = klass->FindInstanceField(name, type); 4262 } 4263 if (resolved == NULL) { 4264 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4265 return NULL; 4266 } 4267 } 4268 dex_cache->SetResolvedField(field_idx, resolved); 4269 return resolved; 4270} 4271 4272mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4273 uint32_t field_idx, 4274 const SirtRef<mirror::DexCache>& dex_cache, 4275 const SirtRef<mirror::ClassLoader>& class_loader) { 4276 DCHECK(dex_cache.get() != nullptr); 4277 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4278 if (resolved != NULL) { 4279 return resolved; 4280 } 4281 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4282 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4283 if (klass == NULL) { 4284 DCHECK(Thread::Current()->IsExceptionPending()); 4285 return NULL; 4286 } 4287 4288 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4289 StringPiece type(dex_file.StringDataByIdx( 4290 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4291 resolved = klass->FindField(name, type); 4292 if (resolved != NULL) { 4293 dex_cache->SetResolvedField(field_idx, resolved); 4294 } else { 4295 ThrowNoSuchFieldError("", klass, type, name); 4296 } 4297 return resolved; 4298} 4299 4300const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4301 uint32_t* length) { 4302 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4303 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4304 const DexFile& dex_file = *dex_cache->GetDexFile(); 4305 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4306 return dex_file.GetMethodShorty(method_id, length); 4307} 4308 4309void ClassLinker::DumpAllClasses(int flags) { 4310 if (dex_cache_image_class_lookup_required_) { 4311 MoveImageClassesToClassTable(); 4312 } 4313 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4314 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4315 std::vector<mirror::Class*> all_classes; 4316 { 4317 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4318 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4319 all_classes.push_back(it.second); 4320 } 4321 } 4322 4323 for (size_t i = 0; i < all_classes.size(); ++i) { 4324 all_classes[i]->DumpClass(std::cerr, flags); 4325 } 4326} 4327 4328void ClassLinker::DumpForSigQuit(std::ostream& os) { 4329 if (dex_cache_image_class_lookup_required_) { 4330 MoveImageClassesToClassTable(); 4331 } 4332 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4333 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4334} 4335 4336size_t ClassLinker::NumLoadedClasses() { 4337 if (dex_cache_image_class_lookup_required_) { 4338 MoveImageClassesToClassTable(); 4339 } 4340 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4341 return class_table_.size(); 4342} 4343 4344pid_t ClassLinker::GetClassesLockOwner() { 4345 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4346} 4347 4348pid_t ClassLinker::GetDexLockOwner() { 4349 return dex_lock_.GetExclusiveOwnerTid(); 4350} 4351 4352void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4353 DCHECK(!init_done_); 4354 4355 DCHECK(klass != NULL); 4356 DCHECK(klass->GetClassLoader() == NULL); 4357 4358 DCHECK(class_roots_ != NULL); 4359 DCHECK(class_roots_->Get(class_root) == NULL); 4360 class_roots_->Set<false>(class_root, klass); 4361} 4362 4363} // namespace art 4364