class_linker.cc revision 08cbf66dc4632913f80f8ac18082c39b7d52c7dd
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 "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "mirror/art_field-inl.h" 47#include "mirror/art_method-inl.h" 48#include "mirror/class.h" 49#include "mirror/class-inl.h" 50#include "mirror/class_loader.h" 51#include "mirror/dex_cache-inl.h" 52#include "mirror/iftable-inl.h" 53#include "mirror/object-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/proxy.h" 56#include "mirror/stack_trace_element.h" 57#include "object_utils.h" 58#include "os.h" 59#include "runtime.h" 60#include "entrypoints/entrypoint_utils.h" 61#include "ScopedLocalRef.h" 62#include "scoped_thread_state_change.h" 63#include "sirt_ref.h" 64#include "stack_indirect_reference_table.h" 65#include "thread.h" 66#include "UniquePtr.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 ClassHelper ve_ch(c->GetVerifyErrorClass()); 101 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 102 } else { 103 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 104 PrettyDescriptor(c).c_str()); 105 } 106} 107 108static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 109 Thread* self = Thread::Current(); 110 JNIEnv* env = self->GetJniEnv(); 111 112 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 113 CHECK(cause.get() != NULL); 114 115 env->ExceptionClear(); 116 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 117 env->Throw(cause.get()); 118 119 // We only wrap non-Error exceptions; an Error can just be used as-is. 120 if (!is_error) { 121 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 122 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 123 } 124} 125 126static size_t Hash(const char* s) { 127 // This is the java.lang.String hashcode for convenience, not interoperability. 128 size_t hash = 0; 129 for (; *s != '\0'; ++s) { 130 hash = hash * 31 + *s; 131 } 132 return hash; 133} 134 135const char* ClassLinker::class_roots_descriptors_[] = { 136 "Ljava/lang/Class;", 137 "Ljava/lang/Object;", 138 "[Ljava/lang/Class;", 139 "[Ljava/lang/Object;", 140 "Ljava/lang/String;", 141 "Ljava/lang/DexCache;", 142 "Ljava/lang/ref/Reference;", 143 "Ljava/lang/reflect/ArtField;", 144 "Ljava/lang/reflect/ArtMethod;", 145 "Ljava/lang/reflect/Proxy;", 146 "[Ljava/lang/String;", 147 "[Ljava/lang/reflect/ArtField;", 148 "[Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/ClassLoader;", 150 "Ljava/lang/Throwable;", 151 "Ljava/lang/ClassNotFoundException;", 152 "Ljava/lang/StackTraceElement;", 153 "Z", 154 "B", 155 "C", 156 "D", 157 "F", 158 "I", 159 "J", 160 "S", 161 "V", 162 "[Z", 163 "[B", 164 "[C", 165 "[D", 166 "[F", 167 "[I", 168 "[J", 169 "[S", 170 "[Ljava/lang/StackTraceElement;", 171}; 172 173ClassLinker::ClassLinker(InternTable* intern_table) 174 // dex_lock_ is recursive as it may be used in stack dumping. 175 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 176 dex_cache_image_class_lookup_required_(false), 177 failed_dex_cache_class_lookups_(0), 178 class_roots_(NULL), 179 array_iftable_(NULL), 180 init_done_(false), 181 dex_caches_dirty_(false), 182 class_table_dirty_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(NULL), 185 quick_resolution_trampoline_(NULL), 186 portable_imt_conflict_trampoline_(NULL), 187 quick_imt_conflict_trampoline_(NULL) { 188 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 189} 190 191void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 192 VLOG(startup) << "ClassLinker::Init"; 193 CHECK(Runtime::Current()->IsCompiler()); 194 195 CHECK(!init_done_); 196 197 // java_lang_Class comes first, it's needed for AllocClass 198 Thread* self = Thread::Current(); 199 gc::Heap* heap = Runtime::Current()->GetHeap(); 200 // The GC can't handle an object with a null class since we can't get the size of this object. 201 heap->IncrementDisableGC(self); 202 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 203 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 204 CHECK(java_lang_Class.get() != NULL); 205 mirror::Class::SetClassClass(java_lang_Class.get()); 206 java_lang_Class->SetClass(java_lang_Class.get()); 207 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 208 heap->DecrementDisableGC(self); 209 // AllocClass(mirror::Class*) can now be used 210 211 // Class[] is used for reflection support. 212 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 213 class_array_class->SetComponentType(java_lang_Class.get()); 214 215 // java_lang_Object comes next so that object_array_class can be created. 216 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 217 CHECK(java_lang_Object.get() != NULL); 218 // backfill Object as the super class of Class. 219 java_lang_Class->SetSuperClass(java_lang_Object.get()); 220 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 221 222 // Object[] next to hold class roots. 223 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 224 object_array_class->SetComponentType(java_lang_Object.get()); 225 226 // Setup the char class to be used for char[]. 227 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 228 229 // Setup the char[] class to be used for String. 230 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 231 char_array_class->SetComponentType(char_class.get()); 232 mirror::CharArray::SetArrayClass(char_array_class.get()); 233 234 // Setup String. 235 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 236 mirror::String::SetClass(java_lang_String.get()); 237 java_lang_String->SetObjectSize(sizeof(mirror::String)); 238 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 239 240 // Create storage for root classes, save away our work so far (requires descriptors). 241 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 242 kClassRootsMax); 243 CHECK(class_roots_ != NULL); 244 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 245 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 246 SetClassRoot(kClassArrayClass, class_array_class.get()); 247 SetClassRoot(kObjectArrayClass, object_array_class.get()); 248 SetClassRoot(kCharArrayClass, char_array_class.get()); 249 SetClassRoot(kJavaLangString, java_lang_String.get()); 250 251 // Setup the primitive type classes. 252 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 253 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 254 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 255 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 256 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 257 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 258 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 259 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 260 261 // Create array interface entries to populate once we can load system classes. 262 array_iftable_ = AllocIfTable(self, 2); 263 264 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 265 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 266 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 267 mirror::IntArray::SetArrayClass(int_array_class.get()); 268 SetClassRoot(kIntArrayClass, int_array_class.get()); 269 270 // now that these are registered, we can use AllocClass() and AllocObjectArray 271 272 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 273 SirtRef<mirror::Class> 274 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 275 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 276 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 277 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 278 279 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 280 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 281 sizeof(mirror::ArtFieldClass))); 282 CHECK(java_lang_reflect_ArtField.get() != NULL); 283 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 284 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 285 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 286 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 287 288 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 289 sizeof(mirror::ArtMethodClass))); 290 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 291 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 292 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 293 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 294 295 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 296 297 // Set up array classes for string, field, method 298 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 299 sizeof(mirror::Class))); 300 object_array_string->SetComponentType(java_lang_String.get()); 301 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 302 303 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 304 sizeof(mirror::Class))); 305 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 306 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 307 308 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 309 sizeof(mirror::Class))); 310 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 311 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 312 313 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 314 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 315 // these roots. 316 CHECK_NE(0U, boot_class_path.size()); 317 for (size_t i = 0; i != boot_class_path.size(); ++i) { 318 const DexFile* dex_file = boot_class_path[i]; 319 CHECK(dex_file != NULL); 320 AppendToBootClassPath(*dex_file); 321 } 322 323 // now we can use FindSystemClass 324 325 // run char class through InitializePrimitiveClass to finish init 326 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 327 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 328 329 // Create runtime resolution and imt conflict methods. Also setup the default imt. 330 Runtime* runtime = Runtime::Current(); 331 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 332 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 333 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 334 335 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 336 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 337 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 338 CHECK_EQ(java_lang_Object.get(), Object_class); 339 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 340 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 341 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 342 CHECK_EQ(java_lang_String.get(), String_class); 343 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 344 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 345 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 346 CHECK_EQ(java_lang_String.get(), String_class); 347 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 348 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 349 350 // Setup the primitive array type classes - can't be done until Object has a vtable. 351 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 352 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 353 354 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 355 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 356 357 mirror::Class* found_char_array_class = FindSystemClass("[C"); 358 CHECK_EQ(char_array_class.get(), found_char_array_class); 359 360 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 361 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 362 363 mirror::Class* found_int_array_class = FindSystemClass("[I"); 364 CHECK_EQ(int_array_class.get(), found_int_array_class); 365 366 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 367 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 368 369 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 370 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 371 372 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 373 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 374 375 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 376 CHECK_EQ(class_array_class.get(), found_class_array_class); 377 378 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 379 CHECK_EQ(object_array_class.get(), found_object_array_class); 380 381 // Setup the single, global copy of "iftable". 382 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 383 CHECK(java_lang_Cloneable != NULL); 384 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 385 CHECK(java_io_Serializable != NULL); 386 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 387 // crawl up and explicitly list all of the supers as well. 388 array_iftable_->SetInterface(0, java_lang_Cloneable); 389 array_iftable_->SetInterface(1, java_io_Serializable); 390 391 // Sanity check Class[] and Object[]'s interfaces. 392 ClassHelper kh(class_array_class.get()); 393 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 394 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 395 kh.ChangeClass(object_array_class.get()); 396 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 397 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 398 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 399 // dex_cache_ fields and register them in class_table_. 400 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 401 CHECK_EQ(java_lang_Class.get(), Class_class); 402 403 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 404 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 405 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 406 407 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 408 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 409 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 410 411 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 412 CHECK_EQ(object_array_string.get(), String_array_class); 413 414 mirror::Class* Art_method_array_class = 415 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 416 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 417 418 mirror::Class* Art_field_array_class = 419 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 420 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 421 422 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 423 424 // Create java.lang.reflect.Proxy root. 425 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 426 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 427 428 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 429 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 430 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 431 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 432 java_lang_ref_FinalizerReference->SetAccessFlags( 433 java_lang_ref_FinalizerReference->GetAccessFlags() | 434 kAccClassIsReference | kAccClassIsFinalizerReference); 435 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 436 java_lang_ref_PhantomReference->SetAccessFlags( 437 java_lang_ref_PhantomReference->GetAccessFlags() | 438 kAccClassIsReference | kAccClassIsPhantomReference); 439 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 440 java_lang_ref_SoftReference->SetAccessFlags( 441 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 442 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 443 java_lang_ref_WeakReference->SetAccessFlags( 444 java_lang_ref_WeakReference->GetAccessFlags() | 445 kAccClassIsReference | kAccClassIsWeakReference); 446 447 // Setup the ClassLoader, verifying the object_size_. 448 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 449 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 450 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 451 452 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 453 // java.lang.StackTraceElement as a convenience. 454 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 455 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 456 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 457 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 458 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 459 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 460 461 FinishInit(); 462 463 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 464} 465 466void ClassLinker::FinishInit() { 467 VLOG(startup) << "ClassLinker::FinishInit entering"; 468 469 // Let the heap know some key offsets into java.lang.ref instances 470 // Note: we hard code the field indexes here rather than using FindInstanceField 471 // as the types of the field can't be resolved prior to the runtime being 472 // fully initialized 473 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 474 mirror::Class* java_lang_ref_FinalizerReference = 475 FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 476 477 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 478 FieldHelper fh(pendingNext); 479 CHECK_STREQ(fh.GetName(), "pendingNext"); 480 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 481 482 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 483 fh.ChangeField(queue); 484 CHECK_STREQ(fh.GetName(), "queue"); 485 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 486 487 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 488 fh.ChangeField(queueNext); 489 CHECK_STREQ(fh.GetName(), "queueNext"); 490 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 491 492 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 493 fh.ChangeField(referent); 494 CHECK_STREQ(fh.GetName(), "referent"); 495 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 496 497 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 498 fh.ChangeField(zombie); 499 CHECK_STREQ(fh.GetName(), "zombie"); 500 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 501 502 gc::Heap* heap = Runtime::Current()->GetHeap(); 503 heap->SetReferenceOffsets(referent->GetOffset(), 504 queue->GetOffset(), 505 queueNext->GetOffset(), 506 pendingNext->GetOffset(), 507 zombie->GetOffset()); 508 509 // ensure all class_roots_ are initialized 510 for (size_t i = 0; i < kClassRootsMax; i++) { 511 ClassRoot class_root = static_cast<ClassRoot>(i); 512 mirror::Class* klass = GetClassRoot(class_root); 513 CHECK(klass != NULL); 514 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 515 // note SetClassRoot does additional validation. 516 // if possible add new checks there to catch errors early 517 } 518 519 CHECK(array_iftable_ != NULL); 520 521 // disable the slow paths in FindClass and CreatePrimitiveClass now 522 // that Object, Class, and Object[] are setup 523 init_done_ = true; 524 525 VLOG(startup) << "ClassLinker::FinishInit exiting"; 526} 527 528void ClassLinker::RunRootClinits() { 529 Thread* self = Thread::Current(); 530 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 531 mirror::Class* c = GetClassRoot(ClassRoot(i)); 532 if (!c->IsArrayClass() && !c->IsPrimitive()) { 533 EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true); 534 self->AssertNoPendingException(); 535 } 536 } 537} 538 539bool ClassLinker::GenerateOatFile(const char* dex_filename, 540 int oat_fd, 541 const char* oat_cache_filename) { 542 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 543 std::string dex2oat_string(GetAndroidRoot()); 544 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 545 const char* dex2oat = dex2oat_string.c_str(); 546 547 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 548 549 gc::Heap* heap = Runtime::Current()->GetHeap(); 550 std::string boot_image_option_string("--boot-image="); 551 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 552 const char* boot_image_option = boot_image_option_string.c_str(); 553 554 std::string dex_file_option_string("--dex-file="); 555 dex_file_option_string += dex_filename; 556 const char* dex_file_option = dex_file_option_string.c_str(); 557 558 std::string oat_fd_option_string("--oat-fd="); 559 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 560 const char* oat_fd_option = oat_fd_option_string.c_str(); 561 562 std::string oat_location_option_string("--oat-location="); 563 oat_location_option_string += oat_cache_filename; 564 const char* oat_location_option = oat_location_option_string.c_str(); 565 566 std::string oat_compiler_filter_string("-compiler-filter:"); 567 Runtime::CompilerFilter filter = Runtime::Current()->GetCompilerFilter(); 568 switch (filter) { 569 case Runtime::kInterpretOnly: 570 oat_compiler_filter_string += "interpret-only"; 571 break; 572 case Runtime::kSpace: 573 oat_compiler_filter_string += "space"; 574 break; 575 case Runtime::kBalanced: 576 oat_compiler_filter_string += "balanced"; 577 break; 578 case Runtime::kSpeed: 579 oat_compiler_filter_string += "speed"; 580 break; 581 case Runtime::kEverything: 582 oat_compiler_filter_string += "everything"; 583 break; 584 default: 585 LOG(FATAL) << "Unexpected case: " << filter; 586 } 587 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 588 589 // fork and exec dex2oat 590 pid_t pid = fork(); 591 if (pid == 0) { 592 // no allocation allowed between fork and exec 593 594 // change process groups, so we don't get reaped by ProcessManager 595 setpgid(0, 0); 596 597 // gLogVerbosity.class_linker = true; 598 VLOG(class_linker) << dex2oat 599 << " --runtime-arg -Xms64m" 600 << " --runtime-arg -Xmx64m" 601 << " --runtime-arg -classpath" 602 << " --runtime-arg " << class_path 603 << " --runtime-arg " << oat_compiler_filter_option 604#if !defined(ART_TARGET) 605 << " --host" 606#endif 607 << " " << boot_image_option 608 << " " << dex_file_option 609 << " " << oat_fd_option 610 << " " << oat_location_option; 611 612 execl(dex2oat, dex2oat, 613 "--runtime-arg", "-Xms64m", 614 "--runtime-arg", "-Xmx64m", 615 "--runtime-arg", "-classpath", 616 "--runtime-arg", class_path, 617 "--runtime-arg", oat_compiler_filter_option, 618#if !defined(ART_TARGET) 619 "--host", 620#endif 621 boot_image_option, 622 dex_file_option, 623 oat_fd_option, 624 oat_location_option, 625 NULL); 626 627 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 628 return false; 629 } else { 630 // wait for dex2oat to finish 631 int status; 632 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 633 if (got_pid != pid) { 634 ScopedObjectAccess soa(Thread::Current()); 635 ThrowIOException("Failed to create oat file. Waitpid failed: wanted %d, got %d", pid, 636 got_pid); 637 return false; 638 } 639 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 640 ScopedObjectAccess soa(Thread::Current()); 641 ThrowIOException("Failed to create oat file. %s failed with dex-file '%s'", dex2oat, 642 dex_filename); 643 return false; 644 } 645 } 646 return true; 647} 648 649const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 650 WriterMutexLock mu(Thread::Current(), dex_lock_); 651 for (size_t i = 0; i < oat_files_.size(); ++i) { 652 if (UNLIKELY(oat_file->GetLocation() == oat_files_[i]->GetLocation())) { 653 VLOG(class_linker) << "Attempt to register oat file that's already registered: " 654 << oat_file->GetLocation(); 655 for (size_t j = i; j < oat_files_.size(); ++j) { 656 CHECK_NE(oat_file, oat_files_[j]) << "Attempt to re-register dex file."; 657 } 658 delete oat_file; 659 return oat_files_[i]; 660 } 661 } 662 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 663 oat_files_.push_back(oat_file); 664 return oat_file; 665} 666 667OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 668 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 669 OatFile* oat_file = space->ReleaseOatFile(); 670 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 671 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 672 return *oat_file; 673} 674 675const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 676 const char* dex_location = dex_file.GetLocation().c_str(); 677 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 678 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 679} 680 681const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 682 const uint32_t* const dex_location_checksum) { 683 ReaderMutexLock mu(Thread::Current(), dex_lock_); 684 for (size_t i = 0; i < oat_files_.size(); i++) { 685 const OatFile* oat_file = oat_files_[i]; 686 DCHECK(oat_file != NULL); 687 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 688 dex_location_checksum, 689 false); 690 if (oat_dex_file != NULL) { 691 return oat_file; 692 } 693 } 694 return NULL; 695} 696 697const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 698 uint32_t dex_location_checksum, 699 const char* oat_location, 700 std::string* error_msg) { 701 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 702 !Runtime::Current()->IsCompiler(), 703 error_msg)); 704 if (oat_file.get() == nullptr) { 705 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 706 error_msg->c_str()); 707 return nullptr; 708 } 709 Runtime* runtime = Runtime::Current(); 710 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 711 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 712 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 713 if (expected_image_oat_checksum != actual_image_oat_checksum) { 714 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 715 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 716 actual_image_oat_checksum); 717 return nullptr; 718 } 719 720 uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 721 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 722 if (expected_image_oat_offset != actual_image_oat_offset) { 723 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %ud, " 724 "found %ud", oat_location, expected_image_oat_offset, 725 actual_image_oat_offset); 726 return nullptr; 727 } 728 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 729 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 730 // the oat file. 731 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 732 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 733 &dex_location_checksum); 734 if (oat_dex_file == nullptr) { 735 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 736 dex_location); 737 return nullptr; 738 } 739 uint32_t expected_dex_checksum = dex_location_checksum; 740 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 741 if (expected_dex_checksum != actual_dex_checksum) { 742 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 743 "found 0x%x", oat_location, expected_dex_checksum, 744 actual_dex_checksum); 745 return nullptr; 746 } 747 return oat_dex_file->OpenDexFile(error_msg); 748} 749 750class ScopedFlock { 751 public: 752 ScopedFlock() {} 753 754 bool Init(const char* filename, std::string* error_msg) { 755 while (true) { 756 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 757 if (file_.get() == NULL) { 758 *error_msg = StringPrintf("Failed to open file '%s'", filename); 759 return false; 760 } 761 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 762 if (flock_result != 0) { 763 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 764 return false; 765 } 766 struct stat fstat_stat; 767 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 768 if (fstat_result != 0) { 769 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 770 return false; 771 } 772 struct stat stat_stat; 773 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 774 if (stat_result != 0) { 775 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 776 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 777 continue; 778 } 779 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 780 LOG(WARNING) << "File changed while locking, will retry: " << filename; 781 continue; 782 } 783 return true; 784 } 785 } 786 787 File& GetFile() { 788 return *file_; 789 } 790 791 ~ScopedFlock() { 792 if (file_.get() != NULL) { 793 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 794 CHECK_EQ(0, flock_result); 795 } 796 } 797 798 private: 799 UniquePtr<File> file_; 800 801 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 802}; 803 804const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 805 uint32_t dex_location_checksum, 806 const char* oat_location, 807 std::string* error_msg) { 808 // We play a locking game here so that if two different processes 809 // race to generate (or worse, one tries to open a partial generated 810 // file) we will be okay. This is actually common with apps that use 811 // DexClassLoader to work around the dex method reference limit and 812 // that have a background service running in a separate process. 813 ScopedFlock scoped_flock; 814 if (!scoped_flock.Init(oat_location, error_msg)) { 815 return nullptr; 816 } 817 818 // Check if we already have an up-to-date output file 819 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 820 oat_location, error_msg); 821 if (dex_file != nullptr) { 822 return dex_file; 823 } 824 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 825 << oat_location << "': " << *error_msg; 826 error_msg->clear(); 827 828 // Generate the output oat file for the dex file 829 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 830 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 831 CHECK(Thread::Current()->IsExceptionPending()); 832 return nullptr; 833 } 834 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 835 !Runtime::Current()->IsCompiler(), 836 error_msg); 837 if (oat_file == nullptr) { 838 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 839 oat_location, error_msg->c_str()); 840 return nullptr; 841 } 842 oat_file = RegisterOatFile(oat_file); 843 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 844 &dex_location_checksum); 845 if (oat_dex_file == nullptr) { 846 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 847 "'%s'", dex_location, dex_location_checksum, oat_location); 848 return nullptr; 849 } 850 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 851 CHECK(result != nullptr) << *error_msg; 852 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 853 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 854 << " dex_location_checksum=" << dex_location_checksum 855 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 856 return result; 857} 858 859bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 860 const char* dex_location, 861 uint32_t dex_location_checksum, 862 std::string* error_msg) { 863 Runtime* runtime = Runtime::Current(); 864 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 865 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 866 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 867 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 868 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 869 870 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 871 if (oat_dex_file == NULL) { 872 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 873 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 874 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 875 for (size_t i = 0; i < oat_dex_files.size(); i++) { 876 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 877 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 878 oat_file->GetLocation().c_str(), 879 oat_dex_file->GetDexFileLocation().c_str()); 880 } 881 return false; 882 } 883 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 884 885 if (image_check && dex_check) { 886 return true; 887 } 888 889 if (!image_check) { 890 ScopedObjectAccess soa(Thread::Current()); 891 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 892 std::string image_file(oat_location->ToModifiedUtf8()); 893 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %d)", 894 oat_file->GetLocation().c_str(), 895 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 896 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 897 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 898 } 899 if (!dex_check) { 900 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 901 oat_file->GetLocation().c_str(), 902 oat_dex_file->GetDexFileLocationChecksum(), 903 dex_location, dex_location_checksum); 904 } 905 return false; 906} 907 908const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 909 const char* dex_location, 910 std::string* error_msg, 911 bool* open_failed) { 912 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 913 if (oat_file.get() == nullptr) { 914 *open_failed = true; 915 return nullptr; 916 } 917 *open_failed = false; 918 uint32_t dex_location_checksum; 919 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 920 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 921 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 922 // directory. 923 const OatFile* opened_oat_file = oat_file.release(); 924 opened_oat_file = RegisterOatFile(opened_oat_file); 925 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 926 if (oat_dex_file == nullptr) { 927 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 928 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 929 error_msg->c_str()); 930 return nullptr; 931 } 932 return oat_dex_file->OpenDexFile(error_msg); 933 } 934 935 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 936 error_msg); 937 if (!verified) { 938 return nullptr; 939 } 940 const OatFile* opened_oat_file = oat_file.release(); 941 opened_oat_file = RegisterOatFile(opened_oat_file); 942 return opened_oat_file->GetOatDexFile(dex_location, 943 &dex_location_checksum)->OpenDexFile(error_msg); 944} 945 946const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 947 const uint32_t* const dex_location_checksum, 948 std::string* error_msg) { 949 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 950 dex_location_checksum); 951 if (open_oat_file != nullptr) { 952 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 953 dex_location_checksum); 954 return oat_dex_file->OpenDexFile(error_msg); 955 } 956 957 // Look for an existing file next to dex. for example, for 958 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 959 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 960 bool open_failed; 961 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 962 error_msg, &open_failed); 963 if (dex_file != nullptr) { 964 return dex_file; 965 } 966 if (dex_location_checksum == nullptr) { 967 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 968 odex_filename.c_str(), dex_location, error_msg->c_str()); 969 return nullptr; 970 } 971 972 std::string cache_error_msg; 973 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 974 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 975 &open_failed); 976 if (dex_file != nullptr) { 977 return dex_file; 978 } 979 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 980 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 981 } 982 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 983 << " (error '" << *error_msg << "') or " << cache_location 984 << " (error '" << cache_error_msg << "')."; 985 986 // Try to generate oat file if it wasn't found or was obsolete. 987 error_msg->clear(); 988 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 989 cache_location.c_str(), error_msg); 990} 991 992const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 993 ReaderMutexLock mu(Thread::Current(), dex_lock_); 994 for (size_t i = 0; i < oat_files_.size(); i++) { 995 const OatFile* oat_file = oat_files_[i]; 996 DCHECK(oat_file != nullptr); 997 if (oat_file->GetLocation() == oat_location) { 998 return oat_file; 999 } 1000 } 1001 return nullptr; 1002} 1003 1004const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1005 std::string* error_msg) { 1006 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1007 if (oat_file != nullptr) { 1008 return oat_file; 1009 } 1010 1011 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1012 error_msg); 1013 if (oat_file == NULL) { 1014 return NULL; 1015 } 1016 return oat_file; 1017} 1018 1019static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1020 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1021 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1022 1023 DCHECK(obj != NULL); 1024 DCHECK(class_linker != NULL); 1025 1026 if (obj->IsArtMethod()) { 1027 mirror::ArtMethod* method = obj->AsArtMethod(); 1028 if (!method->IsNative()) { 1029 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1030 if (method != Runtime::Current()->GetResolutionMethod()) { 1031 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1032 } 1033 } 1034 } 1035} 1036 1037void ClassLinker::InitFromImage() { 1038 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1039 CHECK(!init_done_); 1040 1041 Thread* self = Thread::Current(); 1042 gc::Heap* heap = Runtime::Current()->GetHeap(); 1043 gc::space::ImageSpace* space = heap->GetImageSpace(); 1044 dex_cache_image_class_lookup_required_ = true; 1045 CHECK(space != NULL); 1046 OatFile& oat_file = GetImageOatFile(space); 1047 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1048 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1049 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1050 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1051 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1052 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1053 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1054 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1055 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1056 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1057 1058 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1059 self, 1060 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1061 class_roots_ = class_roots.get(); 1062 1063 // Special case of setting up the String class early so that we can test arbitrary objects 1064 // as being Strings or not 1065 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1066 1067 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1068 static_cast<uint32_t>(dex_caches->GetLength())); 1069 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1070 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1071 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1072 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1073 nullptr); 1074 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1075 std::string error_msg; 1076 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1077 if (dex_file == NULL) { 1078 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1079 << " from within oat file " << oat_file.GetLocation() 1080 << " error '" << error_msg << "'"; 1081 } 1082 1083 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1084 1085 AppendToBootClassPath(*dex_file, dex_cache); 1086 } 1087 1088 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1089 // bitmap walk. 1090 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1091 1092 // Set entry point to interpreter if in InterpretOnly mode. 1093 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1094 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1095 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1096 } 1097 1098 // reinit class_roots_ 1099 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1100 class_roots_ = class_roots.get(); 1101 1102 // reinit array_iftable_ from any array class instance, they should be == 1103 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1104 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1105 // String class root was set above 1106 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1107 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1108 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1109 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1110 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1111 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1112 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1113 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1114 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1115 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1116 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1117 1118 FinishInit(); 1119 1120 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1121} 1122 1123// Keep in sync with InitCallback. Anything we visit, we need to 1124// reinit references to when reinitializing a ClassLinker from a 1125// mapped image. 1126void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) { 1127 class_roots_ = down_cast<mirror::ObjectArray<mirror::Class>*>(visitor(class_roots_, arg)); 1128 Thread* self = Thread::Current(); 1129 { 1130 ReaderMutexLock mu(self, dex_lock_); 1131 if (!only_dirty || dex_caches_dirty_) { 1132 for (mirror::DexCache*& dex_cache : dex_caches_) { 1133 dex_cache = down_cast<mirror::DexCache*>(visitor(dex_cache, arg)); 1134 DCHECK(dex_cache != nullptr); 1135 } 1136 if (clean_dirty) { 1137 dex_caches_dirty_ = false; 1138 } 1139 } 1140 } 1141 1142 { 1143 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1144 if (!only_dirty || class_table_dirty_) { 1145 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1146 it.second = down_cast<mirror::Class*>(visitor(it.second, arg)); 1147 DCHECK(it.second != nullptr); 1148 } 1149 if (clean_dirty) { 1150 class_table_dirty_ = false; 1151 } 1152 } 1153 1154 // We deliberately ignore the class roots in the image since we 1155 // handle image roots by using the MS/CMS rescanning of dirty cards. 1156 } 1157 1158 array_iftable_ = reinterpret_cast<mirror::IfTable*>(visitor(array_iftable_, arg)); 1159 DCHECK(array_iftable_ != nullptr); 1160} 1161 1162void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1163 if (dex_cache_image_class_lookup_required_) { 1164 MoveImageClassesToClassTable(); 1165 } 1166 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1167 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1168 if (!visitor(it.second, arg)) { 1169 return; 1170 } 1171 } 1172} 1173 1174static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1175 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1176 classes->insert(c); 1177 return true; 1178} 1179 1180void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1181 std::set<mirror::Class*> classes; 1182 VisitClasses(GetClassesVisitor, &classes); 1183 for (mirror::Class* klass : classes) { 1184 if (!visitor(klass, arg)) { 1185 return; 1186 } 1187 } 1188} 1189 1190ClassLinker::~ClassLinker() { 1191 mirror::Class::ResetClass(); 1192 mirror::String::ResetClass(); 1193 mirror::ArtField::ResetClass(); 1194 mirror::ArtMethod::ResetClass(); 1195 mirror::BooleanArray::ResetArrayClass(); 1196 mirror::ByteArray::ResetArrayClass(); 1197 mirror::CharArray::ResetArrayClass(); 1198 mirror::DoubleArray::ResetArrayClass(); 1199 mirror::FloatArray::ResetArrayClass(); 1200 mirror::IntArray::ResetArrayClass(); 1201 mirror::LongArray::ResetArrayClass(); 1202 mirror::ShortArray::ResetArrayClass(); 1203 mirror::Throwable::ResetClass(); 1204 mirror::StackTraceElement::ResetClass(); 1205 STLDeleteElements(&boot_class_path_); 1206 STLDeleteElements(&oat_files_); 1207} 1208 1209mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1210 gc::Heap* heap = Runtime::Current()->GetHeap(); 1211 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1212 SirtRef<mirror::DexCache> dex_cache( 1213 self, down_cast<mirror::DexCache*>( 1214 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1215 if (dex_cache.get() == NULL) { 1216 return NULL; 1217 } 1218 SirtRef<mirror::String> 1219 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1220 if (location.get() == NULL) { 1221 return NULL; 1222 } 1223 SirtRef<mirror::ObjectArray<mirror::String> > 1224 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1225 if (strings.get() == NULL) { 1226 return NULL; 1227 } 1228 SirtRef<mirror::ObjectArray<mirror::Class> > 1229 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1230 if (types.get() == NULL) { 1231 return NULL; 1232 } 1233 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1234 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1235 if (methods.get() == NULL) { 1236 return NULL; 1237 } 1238 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1239 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1240 if (fields.get() == NULL) { 1241 return NULL; 1242 } 1243 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1244 initialized_static_storage(self, 1245 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1246 if (initialized_static_storage.get() == NULL) { 1247 return NULL; 1248 } 1249 1250 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1251 fields.get(), initialized_static_storage.get()); 1252 return dex_cache.get(); 1253} 1254 1255mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1256 size_t class_size) { 1257 DCHECK_GE(class_size, sizeof(mirror::Class)); 1258 gc::Heap* heap = Runtime::Current()->GetHeap(); 1259 mirror::Object* k = heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size); 1260 if (UNLIKELY(k == NULL)) { 1261 CHECK(self->IsExceptionPending()); // OOME. 1262 return NULL; 1263 } 1264 mirror::Class* klass = k->AsClass(); 1265 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1266 klass->SetClassSize(class_size); 1267 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1268 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1269 return klass; 1270} 1271 1272mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1273 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1274} 1275 1276mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1277 return down_cast<mirror::ArtField*>( 1278 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1279} 1280 1281mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1282 return down_cast<mirror::ArtMethod*>( 1283 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1284} 1285 1286mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1287 Thread* self, size_t length) { 1288 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1289 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1290} 1291 1292static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1293 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1294 DCHECK(klass != NULL); 1295 // Wait for the class if it has not already been linked. 1296 if (!klass->IsResolved() && !klass->IsErroneous()) { 1297 ObjectLock lock(self, klass); 1298 // Check for circular dependencies between classes. 1299 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1300 ThrowClassCircularityError(klass); 1301 klass->SetStatus(mirror::Class::kStatusError, self); 1302 return NULL; 1303 } 1304 // Wait for the pending initialization to complete. 1305 while (!klass->IsResolved() && !klass->IsErroneous()) { 1306 lock.WaitIgnoringInterrupts(); 1307 } 1308 } 1309 if (klass->IsErroneous()) { 1310 ThrowEarlierClassFailure(klass); 1311 return NULL; 1312 } 1313 // Return the loaded class. No exceptions should be pending. 1314 CHECK(klass->IsResolved()) << PrettyClass(klass); 1315 self->AssertNoPendingException(); 1316 return klass; 1317} 1318 1319bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1320 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1321 return pair.second != NULL; 1322} 1323 1324mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1325 SirtRef<mirror::ClassLoader> class_loader(Thread::Current(), nullptr); 1326 return FindClass(descriptor, class_loader); 1327} 1328 1329mirror::Class* ClassLinker::FindClass(const char* descriptor, 1330 SirtRef<mirror::ClassLoader>& class_loader) { 1331 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1332 Thread* self = Thread::Current(); 1333 DCHECK(self != NULL); 1334 self->AssertNoPendingException(); 1335 if (descriptor[1] == '\0') { 1336 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1337 // for primitive classes that aren't backed by dex files. 1338 return FindPrimitiveClass(descriptor[0]); 1339 } 1340 // Find the class in the loaded classes table. 1341 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1342 if (klass != NULL) { 1343 return EnsureResolved(self, klass); 1344 } 1345 // Class is not yet loaded. 1346 if (descriptor[0] == '[') { 1347 return CreateArrayClass(descriptor, class_loader); 1348 } else if (class_loader.get() == nullptr) { 1349 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1350 if (pair.second != NULL) { 1351 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1352 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1353 } 1354 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1355 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1356 // throw of a NoClassDefFoundError. 1357 if (IsInBootClassPath(descriptor)) { 1358 mirror::Class* system_class = FindSystemClass(descriptor); 1359 CHECK(system_class != NULL); 1360 return system_class; 1361 } 1362 // Next try the compile time class path. 1363 const std::vector<const DexFile*>* class_path; 1364 { 1365 ScopedObjectAccessUnchecked soa(self); 1366 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1367 soa.AddLocalReference<jobject>(class_loader.get())); 1368 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1369 } 1370 1371 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1372 if (pair.second != NULL) { 1373 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1374 } 1375 1376 } else { 1377 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1378 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1379 soa.AddLocalReference<jobject>(class_loader.get())); 1380 std::string class_name_string(DescriptorToDot(descriptor)); 1381 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1382 { 1383 ScopedThreadStateChange tsc(self, kNative); 1384 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1385 soa.Env()->NewStringUTF(class_name_string.c_str())); 1386 if (class_name_object.get() == NULL) { 1387 return NULL; 1388 } 1389 CHECK(class_loader_object.get() != NULL); 1390 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1391 WellKnownClasses::java_lang_ClassLoader_loadClass, 1392 class_name_object.get())); 1393 } 1394 if (soa.Self()->IsExceptionPending()) { 1395 // If the ClassLoader threw, pass that exception up. 1396 return NULL; 1397 } else if (result.get() == NULL) { 1398 // broken loader - throw NPE to be compatible with Dalvik 1399 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1400 class_name_string.c_str()).c_str()); 1401 return NULL; 1402 } else { 1403 // success, return mirror::Class* 1404 return soa.Decode<mirror::Class*>(result.get()); 1405 } 1406 } 1407 1408 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1409 return NULL; 1410} 1411 1412mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1413 SirtRef<mirror::ClassLoader>& class_loader, 1414 const DexFile& dex_file, 1415 const DexFile::ClassDef& dex_class_def) { 1416 Thread* self = Thread::Current(); 1417 SirtRef<mirror::Class> klass(self, NULL); 1418 // Load the class from the dex file. 1419 if (UNLIKELY(!init_done_)) { 1420 // finish up init of hand crafted class_roots_ 1421 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1422 klass.reset(GetClassRoot(kJavaLangObject)); 1423 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1424 klass.reset(GetClassRoot(kJavaLangClass)); 1425 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1426 klass.reset(GetClassRoot(kJavaLangString)); 1427 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1428 klass.reset(GetClassRoot(kJavaLangDexCache)); 1429 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1430 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1431 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1432 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1433 } else { 1434 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1435 } 1436 } else { 1437 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1438 } 1439 if (UNLIKELY(klass.get() == NULL)) { 1440 CHECK(self->IsExceptionPending()); // Expect an OOME. 1441 return NULL; 1442 } 1443 klass->SetDexCache(FindDexCache(dex_file)); 1444 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1445 // Check for a pending exception during load 1446 if (self->IsExceptionPending()) { 1447 klass->SetStatus(mirror::Class::kStatusError, self); 1448 return NULL; 1449 } 1450 ObjectLock lock(self, klass.get()); 1451 klass->SetClinitThreadId(self->GetTid()); 1452 // Add the newly loaded class to the loaded classes table. 1453 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1454 if (existing != NULL) { 1455 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1456 // this thread to block. 1457 return EnsureResolved(self, existing); 1458 } 1459 // Finish loading (if necessary) by finding parents 1460 CHECK(!klass->IsLoaded()); 1461 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1462 // Loading failed. 1463 klass->SetStatus(mirror::Class::kStatusError, self); 1464 return NULL; 1465 } 1466 CHECK(klass->IsLoaded()); 1467 // Link the class (if necessary) 1468 CHECK(!klass->IsResolved()); 1469 // TODO: Use fast jobjects? 1470 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1471 if (!LinkClass(self, klass, interfaces)) { 1472 // Linking failed. 1473 klass->SetStatus(mirror::Class::kStatusError, self); 1474 return NULL; 1475 } 1476 CHECK(klass->IsResolved()); 1477 1478 /* 1479 * We send CLASS_PREPARE events to the debugger from here. The 1480 * definition of "preparation" is creating the static fields for a 1481 * class and initializing them to the standard default values, but not 1482 * executing any code (that comes later, during "initialization"). 1483 * 1484 * We did the static preparation in LinkClass. 1485 * 1486 * The class has been prepared and resolved but possibly not yet verified 1487 * at this point. 1488 */ 1489 Dbg::PostClassPrepare(klass.get()); 1490 1491 return klass.get(); 1492} 1493 1494// Precomputes size that will be needed for Class, matching LinkStaticFields 1495size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1496 const DexFile::ClassDef& dex_class_def) { 1497 const byte* class_data = dex_file.GetClassData(dex_class_def); 1498 size_t num_ref = 0; 1499 size_t num_32 = 0; 1500 size_t num_64 = 0; 1501 if (class_data != NULL) { 1502 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1503 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1504 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1505 char c = descriptor[0]; 1506 if (c == 'L' || c == '[') { 1507 num_ref++; 1508 } else if (c == 'J' || c == 'D') { 1509 num_64++; 1510 } else { 1511 num_32++; 1512 } 1513 } 1514 } 1515 // start with generic class data 1516 size_t size = sizeof(mirror::Class); 1517 // follow with reference fields which must be contiguous at start 1518 size += (num_ref * sizeof(uint32_t)); 1519 // if there are 64-bit fields to add, make sure they are aligned 1520 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1521 if (num_32 != 0) { 1522 // use an available 32-bit field for padding 1523 num_32--; 1524 } 1525 size += sizeof(uint32_t); // either way, we are adding a word 1526 DCHECK_EQ(size, RoundUp(size, 8)); 1527 } 1528 // tack on any 64-bit fields now that alignment is assured 1529 size += (num_64 * sizeof(uint64_t)); 1530 // tack on any remaining 32-bit fields 1531 size += (num_32 * sizeof(uint32_t)); 1532 return size; 1533} 1534 1535const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1536 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1537 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1538 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1539 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1540 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1541 &dex_location_checksum); 1542 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1543 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1544 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1545 return oat_class; 1546} 1547 1548static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1549 uint32_t method_idx) { 1550 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1551 const byte* class_data = dex_file.GetClassData(class_def); 1552 CHECK(class_data != NULL); 1553 ClassDataItemIterator it(dex_file, class_data); 1554 // Skip fields 1555 while (it.HasNextStaticField()) { 1556 it.Next(); 1557 } 1558 while (it.HasNextInstanceField()) { 1559 it.Next(); 1560 } 1561 // Process methods 1562 size_t class_def_method_index = 0; 1563 while (it.HasNextDirectMethod()) { 1564 if (it.GetMemberIndex() == method_idx) { 1565 return class_def_method_index; 1566 } 1567 class_def_method_index++; 1568 it.Next(); 1569 } 1570 while (it.HasNextVirtualMethod()) { 1571 if (it.GetMemberIndex() == method_idx) { 1572 return class_def_method_index; 1573 } 1574 class_def_method_index++; 1575 it.Next(); 1576 } 1577 DCHECK(!it.HasNext()); 1578 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1579 return 0; 1580} 1581 1582const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1583 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1584 // method for direct methods (or virtual methods made direct). 1585 mirror::Class* declaring_class = method->GetDeclaringClass(); 1586 size_t oat_method_index; 1587 if (method->IsStatic() || method->IsDirect()) { 1588 // Simple case where the oat method index was stashed at load time. 1589 oat_method_index = method->GetMethodIndex(); 1590 } else { 1591 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1592 // by search for its position in the declared virtual methods. 1593 oat_method_index = declaring_class->NumDirectMethods(); 1594 size_t end = declaring_class->NumVirtualMethods(); 1595 bool found = false; 1596 for (size_t i = 0; i < end; i++) { 1597 if (declaring_class->GetVirtualMethod(i) == method) { 1598 found = true; 1599 break; 1600 } 1601 oat_method_index++; 1602 } 1603 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1604 } 1605 UniquePtr<const OatFile::OatClass> 1606 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1607 declaring_class->GetDexClassDefIndex())); 1608 CHECK(oat_class.get() != NULL); 1609 DCHECK_EQ(oat_method_index, 1610 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1611 method->GetDeclaringClass()->GetDexClassDefIndex(), 1612 method->GetDexMethodIndex())); 1613 1614 return oat_class->GetOatMethod(oat_method_index); 1615} 1616 1617// Special case to get oat code without overwriting a trampoline. 1618const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1619 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1620 if (method->IsProxyMethod()) { 1621#if !defined(ART_USE_PORTABLE_COMPILER) 1622 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1623#else 1624 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1625#endif 1626 } 1627 const void* result = GetOatMethodFor(method).GetCode(); 1628 if (result == NULL) { 1629 // No code? You must mean to go into the interpreter. 1630 result = GetCompiledCodeToInterpreterBridge(); 1631 } 1632 return result; 1633} 1634 1635const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1636 uint32_t method_idx) { 1637 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1638 CHECK(oat_class.get() != nullptr); 1639 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1640 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1641} 1642 1643// Returns true if the method must run with interpreter, false otherwise. 1644static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1645 if (code == NULL) { 1646 // No code: need interpreter. 1647 return true; 1648 } 1649#ifdef ART_SEA_IR_MODE 1650 ScopedObjectAccess soa(Thread::Current()); 1651 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1652 LOG(INFO) << "Found " << PrettyMethod(method); 1653 return false; 1654 } 1655#endif 1656 // If interpreter mode is enabled, every method (except native and proxy) must 1657 // be run with interpreter. 1658 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1659 !method->IsNative() && !method->IsProxyMethod(); 1660} 1661 1662void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1663 if (klass->NumDirectMethods() == 0) { 1664 return; // No direct methods => no static methods. 1665 } 1666 Runtime* runtime = Runtime::Current(); 1667 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1668 return; // OAT file unavailable. 1669 } 1670 ClassHelper kh(klass); 1671 const DexFile& dex_file = kh.GetDexFile(); 1672 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1673 CHECK(dex_class_def != nullptr); 1674 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1675 // There should always be class data if there were direct methods. 1676 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1677 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1678 CHECK(oat_class.get() != nullptr); 1679 ClassDataItemIterator it(dex_file, class_data); 1680 // Skip fields 1681 while (it.HasNextStaticField()) { 1682 it.Next(); 1683 } 1684 while (it.HasNextInstanceField()) { 1685 it.Next(); 1686 } 1687 // Link the code of methods skipped by LinkCode. 1688 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1689 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1690 if (!method->IsStatic()) { 1691 // Only update static methods. 1692 continue; 1693 } 1694 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1695 const bool enter_interpreter = NeedsInterpreter(method, code); 1696 if (enter_interpreter) { 1697 // Use interpreter entry point. 1698 code = GetCompiledCodeToInterpreterBridge(); 1699 } 1700 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1701 } 1702 // Ignore virtual methods on the iterator. 1703} 1704 1705static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1706 uint32_t method_index) 1707 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1708 // Method shouldn't have already been linked. 1709 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1710 // Every kind of method should at least get an invoke stub from the oat_method. 1711 // non-abstract methods also get their code pointers. 1712 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1713 oat_method.LinkMethod(method.get()); 1714 1715 // Install entry point from interpreter. 1716 Runtime* runtime = Runtime::Current(); 1717 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1718 if (enter_interpreter) { 1719 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1720 } else { 1721 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1722 } 1723 1724 if (method->IsAbstract()) { 1725 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1726 return; 1727 } 1728 1729 if (method->IsStatic() && !method->IsConstructor()) { 1730 // For static methods excluding the class initializer, install the trampoline. 1731 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1732 // after initializing class (see ClassLinker::InitializeClass method). 1733 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1734 } else if (enter_interpreter) { 1735 // Set entry point from compiled code if there's no code or in interpreter only mode. 1736 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1737 } 1738 1739 if (method->IsNative()) { 1740 // Unregistering restores the dlsym lookup stub. 1741 method->UnregisterNative(Thread::Current()); 1742 } 1743 1744 // Allow instrumentation its chance to hijack code. 1745 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1746 method->GetEntryPointFromCompiledCode()); 1747} 1748 1749void ClassLinker::LoadClass(const DexFile& dex_file, 1750 const DexFile::ClassDef& dex_class_def, 1751 SirtRef<mirror::Class>& klass, 1752 mirror::ClassLoader* class_loader) { 1753 CHECK(klass.get() != NULL); 1754 CHECK(klass->GetDexCache() != NULL); 1755 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1756 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1757 CHECK(descriptor != NULL); 1758 1759 klass->SetClass(GetClassRoot(kJavaLangClass)); 1760 uint32_t access_flags = dex_class_def.access_flags_; 1761 // Make sure that none of our runtime-only flags are set. 1762 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1763 klass->SetAccessFlags(access_flags); 1764 klass->SetClassLoader(class_loader); 1765 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1766 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1767 1768 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1769 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1770 1771 // Load fields fields. 1772 const byte* class_data = dex_file.GetClassData(dex_class_def); 1773 if (class_data == NULL) { 1774 return; // no fields or methods - for example a marker interface 1775 } 1776 ClassDataItemIterator it(dex_file, class_data); 1777 Thread* self = Thread::Current(); 1778 if (it.NumStaticFields() != 0) { 1779 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1780 if (UNLIKELY(statics == NULL)) { 1781 CHECK(self->IsExceptionPending()); // OOME. 1782 return; 1783 } 1784 klass->SetSFields(statics); 1785 } 1786 if (it.NumInstanceFields() != 0) { 1787 mirror::ObjectArray<mirror::ArtField>* fields = 1788 AllocArtFieldArray(self, it.NumInstanceFields()); 1789 if (UNLIKELY(fields == NULL)) { 1790 CHECK(self->IsExceptionPending()); // OOME. 1791 return; 1792 } 1793 klass->SetIFields(fields); 1794 } 1795 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1796 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1797 if (UNLIKELY(sfield.get() == NULL)) { 1798 CHECK(self->IsExceptionPending()); // OOME. 1799 return; 1800 } 1801 klass->SetStaticField(i, sfield.get()); 1802 LoadField(dex_file, it, klass, sfield); 1803 } 1804 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1805 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1806 if (UNLIKELY(ifield.get() == NULL)) { 1807 CHECK(self->IsExceptionPending()); // OOME. 1808 return; 1809 } 1810 klass->SetInstanceField(i, ifield.get()); 1811 LoadField(dex_file, it, klass, ifield); 1812 } 1813 1814 UniquePtr<const OatFile::OatClass> oat_class; 1815 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1816 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1817 } 1818 1819 // Load methods. 1820 if (it.NumDirectMethods() != 0) { 1821 // TODO: append direct methods to class object 1822 mirror::ObjectArray<mirror::ArtMethod>* directs = 1823 AllocArtMethodArray(self, it.NumDirectMethods()); 1824 if (UNLIKELY(directs == NULL)) { 1825 CHECK(self->IsExceptionPending()); // OOME. 1826 return; 1827 } 1828 klass->SetDirectMethods(directs); 1829 } 1830 if (it.NumVirtualMethods() != 0) { 1831 // TODO: append direct methods to class object 1832 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1833 AllocArtMethodArray(self, it.NumVirtualMethods()); 1834 if (UNLIKELY(virtuals == NULL)) { 1835 CHECK(self->IsExceptionPending()); // OOME. 1836 return; 1837 } 1838 klass->SetVirtualMethods(virtuals); 1839 } 1840 size_t class_def_method_index = 0; 1841 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1842 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1843 if (UNLIKELY(method.get() == NULL)) { 1844 CHECK(self->IsExceptionPending()); // OOME. 1845 return; 1846 } 1847 klass->SetDirectMethod(i, method.get()); 1848 if (oat_class.get() != NULL) { 1849 LinkCode(method, oat_class.get(), class_def_method_index); 1850 } 1851 method->SetMethodIndex(class_def_method_index); 1852 class_def_method_index++; 1853 } 1854 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1855 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1856 if (UNLIKELY(method.get() == NULL)) { 1857 CHECK(self->IsExceptionPending()); // OOME. 1858 return; 1859 } 1860 klass->SetVirtualMethod(i, method.get()); 1861 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1862 if (oat_class.get() != NULL) { 1863 LinkCode(method, oat_class.get(), class_def_method_index); 1864 } 1865 class_def_method_index++; 1866 } 1867 DCHECK(!it.HasNext()); 1868} 1869 1870void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1871 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1872 uint32_t field_idx = it.GetMemberIndex(); 1873 dst->SetDexFieldIndex(field_idx); 1874 dst->SetDeclaringClass(klass.get()); 1875 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1876} 1877 1878mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1879 const ClassDataItemIterator& it, 1880 SirtRef<mirror::Class>& klass) { 1881 uint32_t dex_method_idx = it.GetMemberIndex(); 1882 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1883 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1884 1885 mirror::ArtMethod* dst = AllocArtMethod(self); 1886 if (UNLIKELY(dst == NULL)) { 1887 CHECK(self->IsExceptionPending()); // OOME. 1888 return NULL; 1889 } 1890 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1891 1892 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1893 dst->SetDexMethodIndex(dex_method_idx); 1894 dst->SetDeclaringClass(klass.get()); 1895 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1896 1897 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1898 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1899 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1900 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1901 1902 uint32_t access_flags = it.GetMemberAccessFlags(); 1903 1904 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1905 // Set finalizable flag on declaring class. 1906 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1907 // Void return type. 1908 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1909 klass->SetFinalizable(); 1910 } else { 1911 ClassHelper kh(klass.get()); 1912 const char* klass_descriptor = kh.GetDescriptor(); 1913 // The Enum class declares a "final" finalize() method to prevent subclasses from 1914 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1915 // subclasses, so we exclude it here. 1916 // We also want to avoid setting the flag on Object, where we know that finalize() is 1917 // empty. 1918 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1919 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1920 klass->SetFinalizable(); 1921 } 1922 } 1923 } 1924 } else if (method_name[0] == '<') { 1925 // Fix broken access flags for initializers. Bug 11157540. 1926 bool is_init = (strcmp("<init>", method_name) == 0); 1927 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1928 if (UNLIKELY(!is_init && !is_clinit)) { 1929 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1930 } else { 1931 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1932 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1933 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1934 access_flags |= kAccConstructor; 1935 } 1936 } 1937 } 1938 dst->SetAccessFlags(access_flags); 1939 1940 self->EndAssertNoThreadSuspension(old_cause); 1941 return dst; 1942} 1943 1944void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1945 Thread* self = Thread::Current(); 1946 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1947 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1948 AppendToBootClassPath(dex_file, dex_cache); 1949} 1950 1951void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1952 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1953 boot_class_path_.push_back(&dex_file); 1954 RegisterDexFile(dex_file, dex_cache); 1955} 1956 1957bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1958 dex_lock_.AssertSharedHeld(Thread::Current()); 1959 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1960 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1961 return true; 1962 } 1963 } 1964 return false; 1965} 1966 1967bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1968 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1969 return IsDexFileRegisteredLocked(dex_file); 1970} 1971 1972void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1973 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1974 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1975 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1976 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1977 dex_caches_.push_back(dex_cache.get()); 1978 dex_cache->SetDexFile(&dex_file); 1979 dex_caches_dirty_ = true; 1980} 1981 1982void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1983 Thread* self = Thread::Current(); 1984 { 1985 ReaderMutexLock mu(self, dex_lock_); 1986 if (IsDexFileRegisteredLocked(dex_file)) { 1987 return; 1988 } 1989 } 1990 // Don't alloc while holding the lock, since allocation may need to 1991 // suspend all threads and another thread may need the dex_lock_ to 1992 // get to a suspend point. 1993 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1994 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1995 { 1996 WriterMutexLock mu(self, dex_lock_); 1997 if (IsDexFileRegisteredLocked(dex_file)) { 1998 return; 1999 } 2000 RegisterDexFileLocked(dex_file, dex_cache); 2001 } 2002} 2003 2004void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 2005 WriterMutexLock mu(Thread::Current(), dex_lock_); 2006 RegisterDexFileLocked(dex_file, dex_cache); 2007} 2008 2009mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2010 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2011 // Search assuming unique-ness of dex file. 2012 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2013 mirror::DexCache* dex_cache = dex_caches_[i]; 2014 if (dex_cache->GetDexFile() == &dex_file) { 2015 return dex_cache; 2016 } 2017 } 2018 // Search matching by location name. 2019 std::string location(dex_file.GetLocation()); 2020 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2021 mirror::DexCache* dex_cache = dex_caches_[i]; 2022 if (dex_cache->GetDexFile()->GetLocation() == location) { 2023 return dex_cache; 2024 } 2025 } 2026 // Failure, dump diagnostic and abort. 2027 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2028 mirror::DexCache* dex_cache = dex_caches_[i]; 2029 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2030 } 2031 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2032 return NULL; 2033} 2034 2035void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2036 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2037 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2038 dex_caches_[i]->Fixup(resolution_method); 2039 } 2040} 2041 2042mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2043 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2044 if (UNLIKELY(klass == NULL)) { 2045 return NULL; 2046 } 2047 return InitializePrimitiveClass(klass, type); 2048} 2049 2050mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 2051 CHECK(primitive_class != NULL); 2052 // Must hold lock on object when initializing. 2053 Thread* self = Thread::Current(); 2054 ObjectLock lock(self, primitive_class); 2055 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2056 primitive_class->SetPrimitiveType(type); 2057 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2058 const char* descriptor = Primitive::Descriptor(type); 2059 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2060 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2061 return primitive_class; 2062} 2063 2064// Create an array class (i.e. the class object for the array, not the 2065// array itself). "descriptor" looks like "[C" or "[[[[B" or 2066// "[Ljava/lang/String;". 2067// 2068// If "descriptor" refers to an array of primitives, look up the 2069// primitive type's internally-generated class object. 2070// 2071// "class_loader" is the class loader of the class that's referring to 2072// us. It's used to ensure that we're looking for the element type in 2073// the right context. It does NOT become the class loader for the 2074// array class; that always comes from the base element class. 2075// 2076// Returns NULL with an exception raised on failure. 2077mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2078 SirtRef<mirror::ClassLoader>& class_loader) { 2079 // Identify the underlying component type 2080 CHECK_EQ('[', descriptor[0]); 2081 mirror::Class* component_type = FindClass(descriptor + 1, class_loader); 2082 if (component_type == NULL) { 2083 DCHECK(Thread::Current()->IsExceptionPending()); 2084 return NULL; 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 Thread* self = Thread::Current(); 2120 SirtRef<mirror::Class> new_class(self, NULL); 2121 if (UNLIKELY(!init_done_)) { 2122 // Classes that were hand created, ie not by FindSystemClass 2123 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2124 new_class.reset(GetClassRoot(kClassArrayClass)); 2125 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2126 new_class.reset(GetClassRoot(kObjectArrayClass)); 2127 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2128 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2129 } else if (strcmp(descriptor, 2130 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2131 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2132 } else if (strcmp(descriptor, 2133 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2134 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2135 } else if (strcmp(descriptor, "[C") == 0) { 2136 new_class.reset(GetClassRoot(kCharArrayClass)); 2137 } else if (strcmp(descriptor, "[I") == 0) { 2138 new_class.reset(GetClassRoot(kIntArrayClass)); 2139 } 2140 } 2141 if (new_class.get() == NULL) { 2142 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2143 if (new_class.get() == NULL) { 2144 return NULL; 2145 } 2146 new_class->SetComponentType(component_type); 2147 } 2148 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2149 DCHECK(new_class->GetComponentType() != NULL); 2150 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2151 new_class->SetSuperClass(java_lang_Object); 2152 new_class->SetVTable(java_lang_Object->GetVTable()); 2153 new_class->SetPrimitiveType(Primitive::kPrimNot); 2154 new_class->SetClassLoader(component_type->GetClassLoader()); 2155 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2156 // don't need to set new_class->SetObjectSize(..) 2157 // because Object::SizeOf delegates to Array::SizeOf 2158 2159 2160 // All arrays have java/lang/Cloneable and java/io/Serializable as 2161 // interfaces. We need to set that up here, so that stuff like 2162 // "instanceof" works right. 2163 // 2164 // Note: The GC could run during the call to FindSystemClass, 2165 // so we need to make sure the class object is GC-valid while we're in 2166 // there. Do this by clearing the interface list so the GC will just 2167 // think that the entries are null. 2168 2169 2170 // Use the single, global copies of "interfaces" and "iftable" 2171 // (remember not to free them for arrays). 2172 CHECK(array_iftable_ != NULL); 2173 new_class->SetIfTable(array_iftable_); 2174 2175 // Inherit access flags from the component type. 2176 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2177 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2178 access_flags &= kAccJavaFlagsMask; 2179 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2180 // and remove "interface". 2181 access_flags |= kAccAbstract | kAccFinal; 2182 access_flags &= ~kAccInterface; 2183 2184 new_class->SetAccessFlags(access_flags); 2185 2186 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2187 if (existing == NULL) { 2188 return new_class.get(); 2189 } 2190 // Another thread must have loaded the class after we 2191 // started but before we finished. Abandon what we've 2192 // done. 2193 // 2194 // (Yes, this happens.) 2195 2196 return existing; 2197} 2198 2199mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2200 switch (Primitive::GetType(type)) { 2201 case Primitive::kPrimByte: 2202 return GetClassRoot(kPrimitiveByte); 2203 case Primitive::kPrimChar: 2204 return GetClassRoot(kPrimitiveChar); 2205 case Primitive::kPrimDouble: 2206 return GetClassRoot(kPrimitiveDouble); 2207 case Primitive::kPrimFloat: 2208 return GetClassRoot(kPrimitiveFloat); 2209 case Primitive::kPrimInt: 2210 return GetClassRoot(kPrimitiveInt); 2211 case Primitive::kPrimLong: 2212 return GetClassRoot(kPrimitiveLong); 2213 case Primitive::kPrimShort: 2214 return GetClassRoot(kPrimitiveShort); 2215 case Primitive::kPrimBoolean: 2216 return GetClassRoot(kPrimitiveBoolean); 2217 case Primitive::kPrimVoid: 2218 return GetClassRoot(kPrimitiveVoid); 2219 case Primitive::kPrimNot: 2220 break; 2221 } 2222 std::string printable_type(PrintableChar(type)); 2223 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2224 return NULL; 2225} 2226 2227mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2228 size_t hash) { 2229 if (VLOG_IS_ON(class_linker)) { 2230 mirror::DexCache* dex_cache = klass->GetDexCache(); 2231 std::string source; 2232 if (dex_cache != NULL) { 2233 source += " from "; 2234 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2235 } 2236 LOG(INFO) << "Loaded class " << descriptor << source; 2237 } 2238 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2239 mirror::Class* existing = 2240 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2241 if (existing != NULL) { 2242 return existing; 2243 } 2244 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2245 // Check a class loaded with the system class loader matches one in the image if the class 2246 // is in the image. 2247 existing = LookupClassFromImage(descriptor); 2248 if (existing != NULL) { 2249 CHECK(klass == existing); 2250 } 2251 } 2252 Runtime::Current()->GetHeap()->VerifyObject(klass); 2253 class_table_.insert(std::make_pair(hash, klass)); 2254 class_table_dirty_ = true; 2255 return NULL; 2256} 2257 2258bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2259 size_t hash = Hash(descriptor); 2260 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2261 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2262 ++it) { 2263 mirror::Class* klass = it->second; 2264 ClassHelper kh(klass); 2265 if ((klass->GetClassLoader() == class_loader) && 2266 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2267 class_table_.erase(it); 2268 return true; 2269 } 2270 } 2271 return false; 2272} 2273 2274mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2275 const mirror::ClassLoader* class_loader) { 2276 size_t hash = Hash(descriptor); 2277 { 2278 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2279 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2280 if (result != NULL) { 2281 return result; 2282 } 2283 } 2284 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2285 return NULL; 2286 } else { 2287 // Lookup failed but need to search dex_caches_. 2288 mirror::Class* result = LookupClassFromImage(descriptor); 2289 if (result != NULL) { 2290 InsertClass(descriptor, result, hash); 2291 } else { 2292 // Searching the image dex files/caches failed, we don't want to get into this situation 2293 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2294 // classes into the class table. 2295 const int32_t kMaxFailedDexCacheLookups = 1000; 2296 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2297 MoveImageClassesToClassTable(); 2298 } 2299 } 2300 return result; 2301 } 2302} 2303 2304mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2305 const mirror::ClassLoader* class_loader, 2306 size_t hash) { 2307 auto end = class_table_.end(); 2308 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2309 mirror::Class* klass = it->second; 2310 ClassHelper kh(klass); 2311 if ((klass->GetClassLoader() == class_loader) && 2312 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2313 if (kIsDebugBuild) { 2314 // Check for duplicates in the table. 2315 for (++it; it != end && it->first == hash; ++it) { 2316 mirror::Class* klass2 = it->second; 2317 ClassHelper kh(klass2); 2318 CHECK(!((klass2->GetClassLoader() == class_loader) && 2319 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2320 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2321 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2322 } 2323 } 2324 return klass; 2325 } 2326 } 2327 return NULL; 2328} 2329 2330static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2331 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2332 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2333 CHECK(image != NULL); 2334 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2335 return root->AsObjectArray<mirror::DexCache>(); 2336} 2337 2338void ClassLinker::MoveImageClassesToClassTable() { 2339 Thread* self = Thread::Current(); 2340 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2341 if (!dex_cache_image_class_lookup_required_) { 2342 return; // All dex cache classes are already in the class table. 2343 } 2344 const char* old_no_suspend_cause = 2345 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2346 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2347 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2348 mirror::DexCache* dex_cache = dex_caches->Get(i); 2349 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2350 for (int32_t j = 0; j < types->GetLength(); j++) { 2351 mirror::Class* klass = types->Get(j); 2352 if (klass != NULL) { 2353 ClassHelper kh(klass); 2354 DCHECK(klass->GetClassLoader() == NULL); 2355 const char* descriptor = kh.GetDescriptor(); 2356 size_t hash = Hash(descriptor); 2357 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2358 if (existing != NULL) { 2359 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2360 << PrettyClassAndClassLoader(klass); 2361 } else { 2362 class_table_.insert(std::make_pair(hash, klass)); 2363 } 2364 } 2365 } 2366 } 2367 class_table_dirty_ = true; 2368 dex_cache_image_class_lookup_required_ = false; 2369 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2370} 2371 2372mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2373 Thread* self = Thread::Current(); 2374 const char* old_no_suspend_cause = 2375 self->StartAssertNoThreadSuspension("Image class lookup"); 2376 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2377 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2378 mirror::DexCache* dex_cache = dex_caches->Get(i); 2379 const DexFile* dex_file = dex_cache->GetDexFile(); 2380 // First search using the class def map, but don't bother for non-class types. 2381 if (descriptor[0] == 'L') { 2382 const DexFile::StringId* descriptor_string_id = dex_file->FindStringId(descriptor); 2383 if (descriptor_string_id != NULL) { 2384 const DexFile::TypeId* type_id = 2385 dex_file->FindTypeId(dex_file->GetIndexForStringId(*descriptor_string_id)); 2386 if (type_id != NULL) { 2387 mirror::Class* klass = dex_cache->GetResolvedType(dex_file->GetIndexForTypeId(*type_id)); 2388 if (klass != NULL) { 2389 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2390 return klass; 2391 } 2392 } 2393 } 2394 } 2395 // Now try binary searching the string/type index. 2396 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2397 if (string_id != NULL) { 2398 const DexFile::TypeId* type_id = 2399 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2400 if (type_id != NULL) { 2401 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2402 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2403 if (klass != NULL) { 2404 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2405 return klass; 2406 } 2407 } 2408 } 2409 } 2410 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2411 return NULL; 2412} 2413 2414void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2415 result.clear(); 2416 if (dex_cache_image_class_lookup_required_) { 2417 MoveImageClassesToClassTable(); 2418 } 2419 size_t hash = Hash(descriptor); 2420 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2421 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2422 it != end && it->first == hash; ++it) { 2423 mirror::Class* klass = it->second; 2424 ClassHelper kh(klass); 2425 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2426 result.push_back(klass); 2427 } 2428 } 2429} 2430 2431void ClassLinker::VerifyClass(mirror::Class* klass) { 2432 // TODO: assert that the monitor on the Class is held 2433 Thread* self = Thread::Current(); 2434 ObjectLock lock(self, klass); 2435 2436 // Don't attempt to re-verify if already sufficiently verified. 2437 if (klass->IsVerified() || 2438 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2439 return; 2440 } 2441 2442 // The class might already be erroneous, for example at compile time if we attempted to verify 2443 // this class as a parent to another. 2444 if (klass->IsErroneous()) { 2445 ThrowEarlierClassFailure(klass); 2446 return; 2447 } 2448 2449 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2450 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2451 } else { 2452 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2453 << PrettyClass(klass); 2454 CHECK(!Runtime::Current()->IsCompiler()); 2455 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2456 } 2457 2458 // Verify super class. 2459 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2460 if (super.get() != NULL) { 2461 // Acquire lock to prevent races on verifying the super class. 2462 ObjectLock lock(self, super.get()); 2463 2464 if (!super->IsVerified() && !super->IsErroneous()) { 2465 VerifyClass(super.get()); 2466 } 2467 if (!super->IsCompileTimeVerified()) { 2468 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2469 PrettyDescriptor(klass).c_str(), 2470 PrettyDescriptor(super.get()).c_str())); 2471 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2472 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2473 if (cause.get() != NULL) { 2474 self->ClearException(); 2475 } 2476 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2477 if (cause.get() != NULL) { 2478 self->GetException(NULL)->SetCause(cause.get()); 2479 } 2480 klass->SetStatus(mirror::Class::kStatusError, self); 2481 return; 2482 } 2483 } 2484 2485 // Try to use verification information from the oat file, otherwise do runtime verification. 2486 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2487 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2488 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2489 if (oat_file_class_status == mirror::Class::kStatusError) { 2490 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2491 << PrettyDescriptor(klass) << " in " 2492 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2493 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2494 PrettyDescriptor(klass).c_str()); 2495 klass->SetStatus(mirror::Class::kStatusError, self); 2496 return; 2497 } 2498 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2499 std::string error_msg; 2500 if (!preverified) { 2501 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, 2502 Runtime::Current()->IsCompiler(), 2503 &error_msg); 2504 } 2505 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2506 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2507 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass) 2508 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2509 << " because: " << error_msg; 2510 } 2511 self->AssertNoPendingException(); 2512 // Make sure all classes referenced by catch blocks are resolved. 2513 ResolveClassExceptionHandlerTypes(dex_file, klass); 2514 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2515 // Even though there were no verifier failures we need to respect whether the super-class 2516 // was verified or requiring runtime reverification. 2517 if (super.get() == NULL || super->IsVerified()) { 2518 klass->SetStatus(mirror::Class::kStatusVerified, self); 2519 } else { 2520 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2521 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2522 // Pretend a soft failure occured so that we don't consider the class verified below. 2523 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2524 } 2525 } else { 2526 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2527 // Soft failures at compile time should be retried at runtime. Soft 2528 // failures at runtime will be handled by slow paths in the generated 2529 // code. Set status accordingly. 2530 if (Runtime::Current()->IsCompiler()) { 2531 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2532 } else { 2533 klass->SetStatus(mirror::Class::kStatusVerified, self); 2534 } 2535 } 2536 } else { 2537 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2538 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2539 << " because: " << error_msg; 2540 self->AssertNoPendingException(); 2541 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2542 klass->SetStatus(mirror::Class::kStatusError, self); 2543 } 2544 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2545 // Class is verified so we don't need to do any access check on its methods. 2546 // Let the interpreter know it by setting the kAccPreverified flag onto each 2547 // method. 2548 // Note: we're going here during compilation and at runtime. When we set the 2549 // kAccPreverified flag when compiling image classes, the flag is recorded 2550 // in the image and is set when loading the image. 2551 klass->SetPreverifiedFlagOnAllMethods(); 2552 } 2553} 2554 2555bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2556 mirror::Class::Status& oat_file_class_status) { 2557 // If we're compiling, we can only verify the class using the oat file if 2558 // we are not compiling the image or if the class we're verifying is not part of 2559 // the app. In other words, we will only check for preverification of bootclasspath 2560 // classes. 2561 if (Runtime::Current()->IsCompiler()) { 2562 // Are we compiling the bootclasspath? 2563 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2564 return false; 2565 } 2566 // We are compiling an app (not the image). 2567 2568 // Is this an app class? (I.e. not a bootclasspath class) 2569 if (klass->GetClassLoader() != NULL) { 2570 return false; 2571 } 2572 } 2573 2574 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2575 // Make this work with gtests, which do not set up the image properly. 2576 // TODO: we should clean up gtests to set up the image path properly. 2577 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2578 return false; 2579 } 2580 2581 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2582 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2583 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2584 &dex_location_checksum); 2585 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2586 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2587 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2588 CHECK(oat_class.get() != NULL) 2589 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2590 << ClassHelper(klass).GetDescriptor(); 2591 oat_file_class_status = oat_class->GetStatus(); 2592 if (oat_file_class_status == mirror::Class::kStatusVerified || 2593 oat_file_class_status == mirror::Class::kStatusInitialized) { 2594 return true; 2595 } 2596 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2597 // Compile time verification failed with a soft error. Compile time verification can fail 2598 // because we have incomplete type information. Consider the following: 2599 // class ... { 2600 // Foo x; 2601 // .... () { 2602 // if (...) { 2603 // v1 gets assigned a type of resolved class Foo 2604 // } else { 2605 // v1 gets assigned a type of unresolved class Bar 2606 // } 2607 // iput x = v1 2608 // } } 2609 // when we merge v1 following the if-the-else it results in Conflict 2610 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2611 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2612 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2613 // at compile time). 2614 return false; 2615 } 2616 if (oat_file_class_status == mirror::Class::kStatusError) { 2617 // Compile time verification failed with a hard error. This is caused by invalid instructions 2618 // in the class. These errors are unrecoverable. 2619 return false; 2620 } 2621 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2622 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2623 // not loading the class. 2624 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2625 // isn't a problem and this case shouldn't occur 2626 return false; 2627 } 2628 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2629 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2630 << ClassHelper(klass).GetDescriptor(); 2631 2632 return false; 2633} 2634 2635void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2636 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2637 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2638 } 2639 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2640 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2641 } 2642} 2643 2644void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2645 mirror::ArtMethod* method) { 2646 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2647 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2648 if (code_item == NULL) { 2649 return; // native or abstract method 2650 } 2651 if (code_item->tries_size_ == 0) { 2652 return; // nothing to process 2653 } 2654 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2655 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2656 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2657 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2658 CatchHandlerIterator iterator(handlers_ptr); 2659 for (; iterator.HasNext(); iterator.Next()) { 2660 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2661 // unresolved exception types will be ignored by exception delivery 2662 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2663 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2664 if (exception_type == NULL) { 2665 DCHECK(Thread::Current()->IsExceptionPending()); 2666 Thread::Current()->ClearException(); 2667 } 2668 } 2669 } 2670 handlers_ptr = iterator.EndDataPointer(); 2671 } 2672} 2673 2674static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2675static void CheckProxyMethod(mirror::ArtMethod* method, 2676 SirtRef<mirror::ArtMethod>& prototype); 2677 2678mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2679 jobjectArray interfaces, jobject loader, 2680 jobjectArray methods, jobjectArray throws) { 2681 Thread* self = soa.Self(); 2682 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2683 sizeof(mirror::SynthesizedProxyClass))); 2684 if (klass.get() == NULL) { 2685 CHECK(self->IsExceptionPending()); // OOME. 2686 return NULL; 2687 } 2688 DCHECK(klass->GetClass() != NULL); 2689 klass->SetObjectSize(sizeof(mirror::Proxy)); 2690 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2691 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2692 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2693 klass->SetName(soa.Decode<mirror::String*>(name)); 2694 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2695 klass->SetDexCache(proxy_class->GetDexCache()); 2696 klass->SetStatus(mirror::Class::kStatusIdx, self); 2697 2698 // Instance fields are inherited, but we add a couple of static fields... 2699 { 2700 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2701 if (UNLIKELY(sfields == NULL)) { 2702 CHECK(self->IsExceptionPending()); // OOME. 2703 return NULL; 2704 } 2705 klass->SetSFields(sfields); 2706 } 2707 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2708 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2709 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2710 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2711 CHECK(self->IsExceptionPending()); // OOME. 2712 return NULL; 2713 } 2714 klass->SetStaticField(0, interfaces_sfield.get()); 2715 interfaces_sfield->SetDexFieldIndex(0); 2716 interfaces_sfield->SetDeclaringClass(klass.get()); 2717 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2718 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2719 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2720 if (UNLIKELY(throws_sfield.get() == NULL)) { 2721 CHECK(self->IsExceptionPending()); // OOME. 2722 return NULL; 2723 } 2724 klass->SetStaticField(1, throws_sfield.get()); 2725 throws_sfield->SetDexFieldIndex(1); 2726 throws_sfield->SetDeclaringClass(klass.get()); 2727 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2728 2729 // Proxies have 1 direct method, the constructor 2730 { 2731 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2732 if (UNLIKELY(directs == NULL)) { 2733 CHECK(self->IsExceptionPending()); // OOME. 2734 return NULL; 2735 } 2736 klass->SetDirectMethods(directs); 2737 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2738 if (UNLIKELY(constructor == NULL)) { 2739 CHECK(self->IsExceptionPending()); // OOME. 2740 return NULL; 2741 } 2742 klass->SetDirectMethod(0, constructor); 2743 } 2744 2745 // Create virtual method using specified prototypes. 2746 size_t num_virtual_methods = 2747 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2748 { 2749 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2750 if (UNLIKELY(virtuals == NULL)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return NULL; 2753 } 2754 klass->SetVirtualMethods(virtuals); 2755 } 2756 for (size_t i = 0; i < num_virtual_methods; ++i) { 2757 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2758 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2759 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2760 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2761 if (UNLIKELY(clone == NULL)) { 2762 CHECK(self->IsExceptionPending()); // OOME. 2763 return NULL; 2764 } 2765 klass->SetVirtualMethod(i, clone); 2766 } 2767 2768 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2769 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2770 self->AssertNoPendingException(); 2771 2772 { 2773 ObjectLock lock(self, klass.get()); // Must hold lock on object when resolved. 2774 // Link the fields and virtual methods, creating vtable and iftables 2775 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2776 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2777 if (!LinkClass(self, klass, sirt_interfaces)) { 2778 klass->SetStatus(mirror::Class::kStatusError, self); 2779 return NULL; 2780 } 2781 2782 interfaces_sfield->SetObject(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2783 throws_sfield->SetObject(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2784 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2785 } 2786 2787 // sanity checks 2788 if (kIsDebugBuild) { 2789 CHECK(klass->GetIFields() == NULL); 2790 CheckProxyConstructor(klass->GetDirectMethod(0)); 2791 for (size_t i = 0; i < num_virtual_methods; ++i) { 2792 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2793 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2794 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2795 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2796 } 2797 2798 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2799 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2800 decoded_name->ToModifiedUtf8().c_str())); 2801 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2802 2803 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2804 decoded_name->ToModifiedUtf8().c_str())); 2805 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2806 2807 mirror::SynthesizedProxyClass* synth_proxy_class = 2808 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2809 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2810 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2811 } 2812 std::string descriptor(GetDescriptorForProxy(klass.get())); 2813 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2814 CHECK(existing == nullptr); 2815 return klass.get(); 2816} 2817 2818std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2819 DCHECK(proxy_class->IsProxyClass()); 2820 mirror::String* name = proxy_class->GetName(); 2821 DCHECK(name != NULL); 2822 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2823} 2824 2825mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2826 const mirror::ArtMethod* proxy_method) { 2827 DCHECK(proxy_class->IsProxyClass()); 2828 DCHECK(proxy_method->IsProxyMethod()); 2829 // Locate the dex cache of the original interface/Object 2830 mirror::DexCache* dex_cache = NULL; 2831 { 2832 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2833 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2834 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2835 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2836 dex_cache = dex_caches_[i]; 2837 break; 2838 } 2839 } 2840 } 2841 CHECK(dex_cache != NULL); 2842 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2843 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2844 CHECK(resolved_method != NULL); 2845 return resolved_method; 2846} 2847 2848 2849mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2850 SirtRef<mirror::Class>& klass, 2851 mirror::Class* proxy_class) { 2852 // Create constructor for Proxy that must initialize h 2853 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2854 proxy_class->GetDirectMethods(); 2855 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2856 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2857 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2858 // code_ too) 2859 mirror::ArtMethod* constructor = 2860 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2861 if (constructor == NULL) { 2862 CHECK(self->IsExceptionPending()); // OOME. 2863 return NULL; 2864 } 2865 // Make this constructor public and fix the class to be our Proxy version 2866 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2867 constructor->SetDeclaringClass(klass.get()); 2868 return constructor; 2869} 2870 2871static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2872 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2873 CHECK(constructor->IsConstructor()); 2874 MethodHelper mh(constructor); 2875 CHECK_STREQ(mh.GetName(), "<init>"); 2876 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2877 DCHECK(constructor->IsPublic()); 2878} 2879 2880mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2881 SirtRef<mirror::ArtMethod>& prototype) { 2882 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2883 // prototype method 2884 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2885 prototype.get()); 2886 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2887 // as necessary 2888 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2889 if (UNLIKELY(method == NULL)) { 2890 CHECK(self->IsExceptionPending()); // OOME. 2891 return NULL; 2892 } 2893 2894 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2895 // the intersection of throw exceptions as defined in Proxy 2896 method->SetDeclaringClass(klass.get()); 2897 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2898 2899 // At runtime the method looks like a reference and argument saving method, clone the code 2900 // related parameters from this method. 2901 mirror::ArtMethod* refs_and_args = 2902 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2903 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2904 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2905 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2906 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2907 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2908 2909 return method; 2910} 2911 2912static void CheckProxyMethod(mirror::ArtMethod* method, 2913 SirtRef<mirror::ArtMethod>& prototype) 2914 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2915 // Basic sanity 2916 CHECK(!prototype->IsFinal()); 2917 CHECK(method->IsFinal()); 2918 CHECK(!method->IsAbstract()); 2919 2920 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2921 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2922 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2923 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2924 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2925 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2926 method->GetDexCacheInitializedStaticStorage()); 2927 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2928 2929 MethodHelper mh(method); 2930 MethodHelper mh2(prototype.get()); 2931 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2932 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2933 // More complex sanity - via dex cache 2934 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2935} 2936 2937static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2938 bool can_init_parents) 2939 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2940 if (can_init_statics && can_init_parents) { 2941 return true; 2942 } 2943 if (!can_init_statics) { 2944 // Check if there's a class initializer. 2945 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2946 if (clinit != NULL) { 2947 return false; 2948 } 2949 // Check if there are encoded static values needing initialization. 2950 if (klass->NumStaticFields() != 0) { 2951 ClassHelper kh(klass); 2952 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2953 DCHECK(dex_class_def != NULL); 2954 if (dex_class_def->static_values_off_ != 0) { 2955 return false; 2956 } 2957 } 2958 } 2959 if (!klass->IsInterface() && klass->HasSuperClass()) { 2960 mirror::Class* super_class = klass->GetSuperClass(); 2961 if (!can_init_parents && !super_class->IsInitialized()) { 2962 return false; 2963 } else { 2964 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 2965 return false; 2966 } 2967 } 2968 } 2969 return true; 2970} 2971 2972bool ClassLinker::IsInitialized() const { 2973 return init_done_; 2974} 2975 2976bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_init_statics, 2977 bool can_init_parents) { 2978 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2979 2980 // Are we already initialized and therefore done? 2981 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2982 // an initialized class will never change its state. 2983 if (klass->IsInitialized()) { 2984 return true; 2985 } 2986 2987 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2988 if (!CanWeInitializeClass(klass, can_init_statics, can_init_parents)) { 2989 return false; 2990 } 2991 2992 Thread* self = Thread::Current(); 2993 uint64_t t0; 2994 { 2995 ObjectLock lock(self, klass); 2996 2997 // Re-check under the lock in case another thread initialized ahead of us. 2998 if (klass->IsInitialized()) { 2999 return true; 3000 } 3001 3002 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3003 if (klass->IsErroneous()) { 3004 ThrowEarlierClassFailure(klass); 3005 return false; 3006 } 3007 3008 CHECK(klass->IsResolved()) << PrettyClass(klass) << ": state=" << klass->GetStatus(); 3009 3010 if (!klass->IsVerified()) { 3011 VerifyClass(klass); 3012 if (!klass->IsVerified()) { 3013 // We failed to verify, expect either the klass to be erroneous or verification failed at 3014 // compile time. 3015 if (klass->IsErroneous()) { 3016 CHECK(self->IsExceptionPending()); 3017 } else { 3018 CHECK(Runtime::Current()->IsCompiler()); 3019 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3020 } 3021 return false; 3022 } 3023 } 3024 3025 // If the class is kStatusInitializing, either this thread is 3026 // initializing higher up the stack or another thread has beat us 3027 // to initializing and we need to wait. Either way, this 3028 // invocation of InitializeClass will not be responsible for 3029 // running <clinit> and will return. 3030 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3031 // We caught somebody else in the act; was it us? 3032 if (klass->GetClinitThreadId() == self->GetTid()) { 3033 // Yes. That's fine. Return so we can continue initializing. 3034 return true; 3035 } 3036 // No. That's fine. Wait for another thread to finish initializing. 3037 return WaitForInitializeClass(klass, self, lock); 3038 } 3039 3040 if (!ValidateSuperClassDescriptors(klass)) { 3041 klass->SetStatus(mirror::Class::kStatusError, self); 3042 return false; 3043 } 3044 3045 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 3046 3047 // From here out other threads may observe that we're initializing and so changes of state 3048 // require the a notification. 3049 klass->SetClinitThreadId(self->GetTid()); 3050 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3051 3052 t0 = NanoTime(); 3053 } 3054 3055 // Initialize super classes, must be done while initializing for the JLS. 3056 if (!klass->IsInterface() && klass->HasSuperClass()) { 3057 mirror::Class* super_class = klass->GetSuperClass(); 3058 if (!super_class->IsInitialized()) { 3059 CHECK(!super_class->IsInterface()); 3060 CHECK(can_init_parents); 3061 bool super_initialized = InitializeClass(super_class, can_init_statics, true); 3062 if (!super_initialized) { 3063 // The super class was verified ahead of entering initializing, we should only be here if 3064 // the super class became erroneous due to initialization. 3065 CHECK(super_class->IsErroneous() && self->IsExceptionPending()) 3066 << "Super class initialization failed for " << PrettyDescriptor(super_class) 3067 << " that has unexpected status " << super_class->GetStatus() 3068 << "\nPending exception:\n" 3069 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3070 ObjectLock lock(self, klass); 3071 // Initialization failed because the super-class is erroneous. 3072 klass->SetStatus(mirror::Class::kStatusError, self); 3073 return false; 3074 } 3075 } 3076 } 3077 3078 if (klass->NumStaticFields() > 0) { 3079 ClassHelper kh(klass); 3080 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3081 CHECK(dex_class_def != NULL); 3082 const DexFile& dex_file = kh.GetDexFile(); 3083 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3084 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3085 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3086 this, *dex_class_def); 3087 if (it.HasNext()) { 3088 CHECK(can_init_statics); 3089 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3090 SafeMap<uint32_t, mirror::ArtField*> field_map; 3091 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 3092 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3093 it.ReadValueToField(field_map.Get(i)); 3094 } 3095 } 3096 } 3097 3098 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3099 if (clinit != NULL) { 3100 CHECK(can_init_statics); 3101 if (LIKELY(Runtime::Current()->IsStarted())) { 3102 JValue result; 3103 clinit->Invoke(self, NULL, 0, &result, 'V'); 3104 } else { 3105 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3106 } 3107 } 3108 3109 // Opportunistically set static method trampolines to their destination. 3110 FixupStaticTrampolines(klass); 3111 3112 uint64_t t1 = NanoTime(); 3113 3114 bool success = true; 3115 { 3116 ObjectLock lock(self, klass); 3117 3118 if (self->IsExceptionPending()) { 3119 WrapExceptionInInitializer(); 3120 klass->SetStatus(mirror::Class::kStatusError, self); 3121 success = false; 3122 } else { 3123 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3124 RuntimeStats* thread_stats = self->GetStats(); 3125 ++global_stats->class_init_count; 3126 ++thread_stats->class_init_count; 3127 global_stats->class_init_time_ns += (t1 - t0); 3128 thread_stats->class_init_time_ns += (t1 - t0); 3129 // Set the class as initialized except if failed to initialize static fields. 3130 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3131 if (VLOG_IS_ON(class_linker)) { 3132 ClassHelper kh(klass); 3133 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3134 } 3135 } 3136 } 3137 return success; 3138} 3139 3140bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 3141 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3142 while (true) { 3143 self->AssertNoPendingException(); 3144 CHECK(!klass->IsInitialized()); 3145 lock.WaitIgnoringInterrupts(); 3146 3147 // When we wake up, repeat the test for init-in-progress. If 3148 // there's an exception pending (only possible if 3149 // "interruptShouldThrow" was set), bail out. 3150 if (self->IsExceptionPending()) { 3151 WrapExceptionInInitializer(); 3152 klass->SetStatus(mirror::Class::kStatusError, self); 3153 return false; 3154 } 3155 // Spurious wakeup? Go back to waiting. 3156 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3157 continue; 3158 } 3159 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3160 // Compile time initialization failed. 3161 return false; 3162 } 3163 if (klass->IsErroneous()) { 3164 // The caller wants an exception, but it was thrown in a 3165 // different thread. Synthesize one here. 3166 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3167 PrettyDescriptor(klass).c_str()); 3168 return false; 3169 } 3170 if (klass->IsInitialized()) { 3171 return true; 3172 } 3173 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 3174 } 3175 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 3176} 3177 3178bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 3179 if (klass->IsInterface()) { 3180 return true; 3181 } 3182 // begin with the methods local to the superclass 3183 if (klass->HasSuperClass() && 3184 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3185 const mirror::Class* super = klass->GetSuperClass(); 3186 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3187 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3188 if (method != super->GetVTable()->Get(i) && 3189 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 3190 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 3191 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 3192 PrettyDescriptor(super).c_str()); 3193 return false; 3194 } 3195 } 3196 } 3197 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3198 mirror::Class* interface = klass->GetIfTable()->GetInterface(i); 3199 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3200 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3201 const mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3202 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 3203 method->GetDeclaringClass())) { 3204 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 3205 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3206 PrettyMethod(method).c_str(), 3207 PrettyDescriptor(interface).c_str()); 3208 return false; 3209 } 3210 } 3211 } 3212 } 3213 return true; 3214} 3215 3216// Returns true if classes referenced by the signature of the method are the 3217// same classes in klass1 as they are in klass2. 3218bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 3219 const mirror::Class* klass1, 3220 const mirror::Class* klass2) { 3221 if (klass1 == klass2) { 3222 return true; 3223 } 3224 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3225 const DexFile::ProtoId& proto_id = 3226 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3227 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3228 const char* descriptor = it.GetDescriptor(); 3229 if (descriptor == NULL) { 3230 break; 3231 } 3232 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3233 // Found a non-primitive type. 3234 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3235 return false; 3236 } 3237 } 3238 } 3239 // Check the return type 3240 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3241 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3242 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3243 return false; 3244 } 3245 } 3246 return true; 3247} 3248 3249// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 3250bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3251 const mirror::Class* klass1, 3252 const mirror::Class* klass2) { 3253 CHECK(descriptor != NULL); 3254 CHECK(klass1 != NULL); 3255 CHECK(klass2 != NULL); 3256 if (klass1 == klass2) { 3257 return true; 3258 } 3259 Thread* self = Thread::Current(); 3260 SirtRef<mirror::ClassLoader> class_loader1(self, klass1->GetClassLoader()); 3261 mirror::Class* found1 = FindClass(descriptor, class_loader1); 3262 if (found1 == NULL) { 3263 Thread::Current()->ClearException(); 3264 } 3265 SirtRef<mirror::ClassLoader> class_loader2(self, klass2->GetClassLoader()); 3266 mirror::Class* found2 = FindClass(descriptor, class_loader2); 3267 if (found2 == NULL) { 3268 Thread::Current()->ClearException(); 3269 } 3270 return found1 == found2; 3271} 3272 3273bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_init_fields, bool can_init_parents) { 3274 DCHECK(c != NULL); 3275 if (c->IsInitialized()) { 3276 return true; 3277 } 3278 3279 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3280 if (!success) { 3281 Thread* self = Thread::Current(); 3282 CHECK(self->IsExceptionPending() || !can_init_fields || !can_init_parents) << PrettyClass(c); 3283 } 3284 return success; 3285} 3286 3287void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3288 mirror::Class* c, 3289 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3290 const byte* class_data = dex_file.GetClassData(dex_class_def); 3291 ClassDataItemIterator it(dex_file, class_data); 3292 Thread* self = Thread::Current(); 3293 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3294 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3295 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3296 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3297 } 3298} 3299 3300bool ClassLinker::LinkClass(Thread* self, SirtRef<mirror::Class>& klass, 3301 SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3302 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3303 if (!LinkSuperClass(klass)) { 3304 return false; 3305 } 3306 if (!LinkMethods(klass, interfaces)) { 3307 return false; 3308 } 3309 if (!LinkInstanceFields(klass)) { 3310 return false; 3311 } 3312 if (!LinkStaticFields(klass)) { 3313 return false; 3314 } 3315 CreateReferenceInstanceOffsets(klass); 3316 CreateReferenceStaticOffsets(klass); 3317 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3318 klass->SetStatus(mirror::Class::kStatusResolved, self); 3319 return true; 3320} 3321 3322bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3323 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3324 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3325 uint16_t super_class_idx = class_def.superclass_idx_; 3326 if (super_class_idx != DexFile::kDexNoIndex16) { 3327 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3328 if (super_class == NULL) { 3329 DCHECK(Thread::Current()->IsExceptionPending()); 3330 return false; 3331 } 3332 // Verify 3333 if (!klass->CanAccess(super_class)) { 3334 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3335 PrettyDescriptor(super_class).c_str(), 3336 PrettyDescriptor(klass.get()).c_str()); 3337 return false; 3338 } 3339 klass->SetSuperClass(super_class); 3340 } 3341 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3342 if (interfaces != NULL) { 3343 for (size_t i = 0; i < interfaces->Size(); i++) { 3344 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3345 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3346 if (interface == NULL) { 3347 DCHECK(Thread::Current()->IsExceptionPending()); 3348 return false; 3349 } 3350 // Verify 3351 if (!klass->CanAccess(interface)) { 3352 // TODO: the RI seemed to ignore this in my testing. 3353 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3354 PrettyDescriptor(interface).c_str(), 3355 PrettyDescriptor(klass.get()).c_str()); 3356 return false; 3357 } 3358 } 3359 } 3360 // Mark the class as loaded. 3361 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3362 return true; 3363} 3364 3365bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3366 CHECK(!klass->IsPrimitive()); 3367 mirror::Class* super = klass->GetSuperClass(); 3368 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3369 if (super != NULL) { 3370 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3371 return false; 3372 } 3373 return true; 3374 } 3375 if (super == NULL) { 3376 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3377 PrettyDescriptor(klass.get()).c_str()); 3378 return false; 3379 } 3380 // Verify 3381 if (super->IsFinal() || super->IsInterface()) { 3382 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3383 PrettyDescriptor(super).c_str(), 3384 PrettyDescriptor(klass.get()).c_str(), 3385 super->IsFinal() ? "declared final" : "an interface"); 3386 return false; 3387 } 3388 if (!klass->CanAccess(super)) { 3389 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3390 PrettyDescriptor(super).c_str(), 3391 PrettyDescriptor(klass.get()).c_str()); 3392 return false; 3393 } 3394 3395 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3396 if (super->IsFinalizable()) { 3397 klass->SetFinalizable(); 3398 } 3399 3400 // Inherit reference flags (if any) from the superclass. 3401 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3402 if (reference_flags != 0) { 3403 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3404 } 3405 // Disallow custom direct subclasses of java.lang.ref.Reference. 3406 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3407 ThrowLinkageError(klass.get(), 3408 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3409 PrettyDescriptor(klass.get()).c_str()); 3410 return false; 3411 } 3412 3413 if (kIsDebugBuild) { 3414 // Ensure super classes are fully resolved prior to resolving fields.. 3415 while (super != NULL) { 3416 CHECK(super->IsResolved()); 3417 super = super->GetSuperClass(); 3418 } 3419 } 3420 return true; 3421} 3422 3423// Populate the class vtable and itable. Compute return type indices. 3424bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3425 SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3426 if (klass->IsInterface()) { 3427 // No vtable. 3428 size_t count = klass->NumVirtualMethods(); 3429 if (!IsUint(16, count)) { 3430 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3431 return false; 3432 } 3433 for (size_t i = 0; i < count; ++i) { 3434 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3435 } 3436 // Link interface method tables 3437 return LinkInterfaceMethods(klass, interfaces); 3438 } else { 3439 // Link virtual and interface method tables 3440 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3441 } 3442 return true; 3443} 3444 3445bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3446 Thread* self = Thread::Current(); 3447 if (klass->HasSuperClass()) { 3448 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3449 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3450 CHECK_LE(actual_count, max_count); 3451 // TODO: do not assign to the vtable field until it is fully constructed. 3452 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3453 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3454 if (UNLIKELY(vtable.get() == NULL)) { 3455 CHECK(self->IsExceptionPending()); // OOME. 3456 return false; 3457 } 3458 // See if any of our virtual methods override the superclass. 3459 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3460 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3461 MethodHelper local_mh(local_method); 3462 size_t j = 0; 3463 for (; j < actual_count; ++j) { 3464 mirror::ArtMethod* super_method = vtable->Get(j); 3465 MethodHelper super_mh(super_method); 3466 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3467 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3468 if (super_method->IsFinal()) { 3469 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3470 PrettyMethod(local_method).c_str(), 3471 super_mh.GetDeclaringClassDescriptor()); 3472 return false; 3473 } 3474 vtable->Set(j, local_method); 3475 local_method->SetMethodIndex(j); 3476 break; 3477 } else { 3478 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3479 << " would have incorrectly overridden the package-private method in " 3480 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3481 } 3482 } 3483 } 3484 if (j == actual_count) { 3485 // Not overriding, append. 3486 vtable->Set(actual_count, local_method); 3487 local_method->SetMethodIndex(actual_count); 3488 actual_count += 1; 3489 } 3490 } 3491 if (!IsUint(16, actual_count)) { 3492 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3493 return false; 3494 } 3495 // Shrink vtable if possible 3496 CHECK_LE(actual_count, max_count); 3497 if (actual_count < max_count) { 3498 vtable.reset(vtable->CopyOf(self, actual_count)); 3499 if (UNLIKELY(vtable.get() == NULL)) { 3500 CHECK(self->IsExceptionPending()); // OOME. 3501 return false; 3502 } 3503 } 3504 klass->SetVTable(vtable.get()); 3505 } else { 3506 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3507 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3508 if (!IsUint(16, num_virtual_methods)) { 3509 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3510 return false; 3511 } 3512 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3513 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3514 if (UNLIKELY(vtable.get() == NULL)) { 3515 CHECK(self->IsExceptionPending()); // OOME. 3516 return false; 3517 } 3518 for (size_t i = 0; i < num_virtual_methods; ++i) { 3519 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3520 vtable->Set(i, virtual_method); 3521 virtual_method->SetMethodIndex(i & 0xFFFF); 3522 } 3523 klass->SetVTable(vtable.get()); 3524 } 3525 return true; 3526} 3527 3528bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3529 SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3530 // Set the imt table to be all conflicts by default. 3531 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3532 size_t super_ifcount; 3533 if (klass->HasSuperClass()) { 3534 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3535 } else { 3536 super_ifcount = 0; 3537 } 3538 size_t ifcount = super_ifcount; 3539 ClassHelper kh(klass.get()); 3540 uint32_t 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 if (ifcount == 0) { 3549 // Class implements no interfaces. 3550 DCHECK_EQ(klass->GetIfTableCount(), 0); 3551 DCHECK(klass->GetIfTable() == NULL); 3552 return true; 3553 } 3554 if (ifcount == super_ifcount) { 3555 // Class implements same interfaces as parent, are any of these not marker interfaces? 3556 bool has_non_marker_interface = false; 3557 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3558 for (size_t i = 0; i < ifcount; ++i) { 3559 if (super_iftable->GetMethodArrayCount(i) > 0) { 3560 has_non_marker_interface = true; 3561 break; 3562 } 3563 } 3564 if (!has_non_marker_interface) { 3565 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3566 klass->SetIfTable(super_iftable); 3567 return true; 3568 } 3569 } 3570 Thread* self = Thread::Current(); 3571 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3572 if (UNLIKELY(iftable.get() == NULL)) { 3573 CHECK(self->IsExceptionPending()); // OOME. 3574 return false; 3575 } 3576 if (super_ifcount != 0) { 3577 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3578 for (size_t i = 0; i < super_ifcount; i++) { 3579 mirror::Class* super_interface = super_iftable->GetInterface(i); 3580 iftable->SetInterface(i, super_interface); 3581 } 3582 } 3583 // Flatten the interface inheritance hierarchy. 3584 size_t idx = super_ifcount; 3585 for (size_t i = 0; i < num_interfaces; i++) { 3586 mirror::Class* interface = 3587 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3588 DCHECK(interface != NULL); 3589 if (!interface->IsInterface()) { 3590 ClassHelper ih(interface); 3591 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3592 PrettyDescriptor(klass.get()).c_str(), 3593 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3594 return false; 3595 } 3596 // Check if interface is already in iftable 3597 bool duplicate = false; 3598 for (size_t j = 0; j < idx; j++) { 3599 mirror::Class* existing_interface = iftable->GetInterface(j); 3600 if (existing_interface == interface) { 3601 duplicate = true; 3602 break; 3603 } 3604 } 3605 if (!duplicate) { 3606 // Add this non-duplicate interface. 3607 iftable->SetInterface(idx++, interface); 3608 // Add this interface's non-duplicate super-interfaces. 3609 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3610 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3611 bool super_duplicate = false; 3612 for (size_t k = 0; k < idx; k++) { 3613 mirror::Class* existing_interface = iftable->GetInterface(k); 3614 if (existing_interface == super_interface) { 3615 super_duplicate = true; 3616 break; 3617 } 3618 } 3619 if (!super_duplicate) { 3620 iftable->SetInterface(idx++, super_interface); 3621 } 3622 } 3623 } 3624 } 3625 // Shrink iftable in case duplicates were found 3626 if (idx < ifcount) { 3627 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3628 if (UNLIKELY(iftable.get() == NULL)) { 3629 CHECK(self->IsExceptionPending()); // OOME. 3630 return false; 3631 } 3632 ifcount = idx; 3633 } else { 3634 CHECK_EQ(idx, ifcount); 3635 } 3636 klass->SetIfTable(iftable.get()); 3637 3638 // If we're an interface, we don't need the vtable pointers, so we're done. 3639 if (klass->IsInterface()) { 3640 return true; 3641 } 3642 // Allocate imtable 3643 bool imtable_changed = false; 3644 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3645 if (UNLIKELY(imtable.get() == NULL)) { 3646 CHECK(self->IsExceptionPending()); // OOME. 3647 return false; 3648 } 3649 std::vector<mirror::ArtMethod*> miranda_list; 3650 MethodHelper vtable_mh(NULL); 3651 MethodHelper interface_mh(NULL); 3652 for (size_t i = 0; i < ifcount; ++i) { 3653 mirror::Class* interface = iftable->GetInterface(i); 3654 size_t num_methods = interface->NumVirtualMethods(); 3655 if (num_methods > 0) { 3656 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3657 method_array(self, AllocArtMethodArray(self, num_methods)); 3658 if (UNLIKELY(method_array.get() == nullptr)) { 3659 CHECK(self->IsExceptionPending()); // OOME. 3660 return false; 3661 } 3662 iftable->SetMethodArray(i, method_array.get()); 3663 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3664 klass->GetVTableDuringLinking()); 3665 for (size_t j = 0; j < num_methods; ++j) { 3666 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3667 interface_mh.ChangeMethod(interface_method); 3668 int32_t k; 3669 // For each method listed in the interface's method list, find the 3670 // matching method in our class's method list. We want to favor the 3671 // subclass over the superclass, which just requires walking 3672 // back from the end of the vtable. (This only matters if the 3673 // superclass defines a private method and this class redefines 3674 // it -- otherwise it would use the same vtable slot. In .dex files 3675 // those don't end up in the virtual method table, so it shouldn't 3676 // matter which direction we go. We walk it backward anyway.) 3677 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3678 mirror::ArtMethod* vtable_method = vtable->Get(k); 3679 vtable_mh.ChangeMethod(vtable_method); 3680 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3681 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3682 ThrowIllegalAccessError(klass.get(), 3683 "Method '%s' implementing interface method '%s' is not public", 3684 PrettyMethod(vtable_method).c_str(), 3685 PrettyMethod(interface_method).c_str()); 3686 return false; 3687 } 3688 method_array->Set(j, vtable_method); 3689 // Place method in imt if entry is empty, place conflict otherwise. 3690 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3691 if (imtable->Get(imt_index) == NULL) { 3692 imtable->Set(imt_index, vtable_method); 3693 imtable_changed = true; 3694 } else { 3695 imtable->Set(imt_index, Runtime::Current()->GetImtConflictMethod()); 3696 } 3697 break; 3698 } 3699 } 3700 if (k < 0) { 3701 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3702 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3703 mirror::ArtMethod* mir_method = miranda_list[mir]; 3704 vtable_mh.ChangeMethod(mir_method); 3705 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3706 miranda_method.reset(miranda_list[mir]); 3707 break; 3708 } 3709 } 3710 if (miranda_method.get() == NULL) { 3711 // Point the interface table at a phantom slot. 3712 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3713 if (UNLIKELY(miranda_method.get() == NULL)) { 3714 CHECK(self->IsExceptionPending()); // OOME. 3715 return false; 3716 } 3717 // TODO: If a methods move then the miranda_list may hold stale references. 3718 miranda_list.push_back(miranda_method.get()); 3719 } 3720 method_array->Set(j, miranda_method.get()); 3721 } 3722 } 3723 } 3724 } 3725 if (imtable_changed) { 3726 // Fill in empty entries in interface method table with conflict. 3727 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3728 for (size_t i = 0; i < kImtSize; i++) { 3729 if (imtable->Get(i) == NULL) { 3730 imtable->Set(i, imt_conflict_method); 3731 } 3732 } 3733 klass->SetImTable(imtable.get()); 3734 } 3735 if (!miranda_list.empty()) { 3736 int old_method_count = klass->NumVirtualMethods(); 3737 int new_method_count = old_method_count + miranda_list.size(); 3738 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3739 if (old_method_count == 0) { 3740 virtuals = AllocArtMethodArray(self, new_method_count); 3741 } else { 3742 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3743 } 3744 if (UNLIKELY(virtuals == NULL)) { 3745 CHECK(self->IsExceptionPending()); // OOME. 3746 return false; 3747 } 3748 klass->SetVirtualMethods(virtuals); 3749 3750 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3751 vtable(self, klass->GetVTableDuringLinking()); 3752 CHECK(vtable.get() != NULL); 3753 int old_vtable_count = vtable->GetLength(); 3754 int new_vtable_count = old_vtable_count + miranda_list.size(); 3755 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3756 if (UNLIKELY(vtable.get() == NULL)) { 3757 CHECK(self->IsExceptionPending()); // OOME. 3758 return false; 3759 } 3760 for (size_t i = 0; i < miranda_list.size(); ++i) { 3761 mirror::ArtMethod* method = miranda_list[i]; 3762 // Leave the declaring class alone as type indices are relative to it 3763 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3764 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3765 klass->SetVirtualMethod(old_method_count + i, method); 3766 vtable->Set(old_vtable_count + i, method); 3767 } 3768 // TODO: do not assign to the vtable field until it is fully constructed. 3769 klass->SetVTable(vtable.get()); 3770 } 3771 3772 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3773 for (int i = 0; i < vtable->GetLength(); ++i) { 3774 CHECK(vtable->Get(i) != NULL); 3775 } 3776 3777// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3778 3779 return true; 3780} 3781 3782bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3783 CHECK(klass.get() != NULL); 3784 return LinkFields(klass, false); 3785} 3786 3787bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3788 CHECK(klass.get() != NULL); 3789 size_t allocated_class_size = klass->GetClassSize(); 3790 bool success = LinkFields(klass, true); 3791 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3792 return success; 3793} 3794 3795struct LinkFieldsComparator { 3796 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3797 } 3798 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3799 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3800 NO_THREAD_SAFETY_ANALYSIS { 3801 // First come reference fields, then 64-bit, and finally 32-bit 3802 FieldHelper fh1(field1); 3803 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3804 FieldHelper fh2(field2); 3805 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3806 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3807 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3808 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3809 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3810 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3811 int order2 = (!isPrimitive2 ? 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(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(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(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(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(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(SirtRef<mirror::Class>& klass) { 3997 CreateReferenceOffsets(klass, true, 0); 3998} 3999 4000void ClassLinker::CreateReferenceOffsets(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 const 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 const 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 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 const 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 SirtRef<mirror::DexCache>& dex_cache, 4056 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 Thread::Current()->ClearException(); 4075 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4076 self->GetException(NULL)->SetCause(cause.get()); 4077 } 4078 } 4079 } 4080 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4081 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4082 return resolved; 4083} 4084 4085mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4086 uint32_t method_idx, 4087 SirtRef<mirror::DexCache>& dex_cache, 4088 SirtRef<mirror::ClassLoader>& class_loader, 4089 const mirror::ArtMethod* referrer, 4090 InvokeType type) { 4091 DCHECK(dex_cache.get() != NULL); 4092 // Check for hit in the dex cache. 4093 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4094 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4095 return resolved; 4096 } 4097 // Fail, get the declaring class. 4098 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4099 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4100 if (klass == NULL) { 4101 DCHECK(Thread::Current()->IsExceptionPending()); 4102 return NULL; 4103 } 4104 // Scan using method_idx, this saves string compares but will only hit for matching dex 4105 // caches/files. 4106 switch (type) { 4107 case kDirect: // Fall-through. 4108 case kStatic: 4109 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4110 break; 4111 case kInterface: 4112 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4113 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4114 break; 4115 case kSuper: // Fall-through. 4116 case kVirtual: 4117 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4118 break; 4119 default: 4120 LOG(FATAL) << "Unreachable - invocation type: " << type; 4121 } 4122 if (resolved == NULL) { 4123 // Search by name, which works across dex files. 4124 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4125 const Signature signature = dex_file.GetMethodSignature(method_id); 4126 switch (type) { 4127 case kDirect: // Fall-through. 4128 case kStatic: 4129 resolved = klass->FindDirectMethod(name, signature); 4130 break; 4131 case kInterface: 4132 resolved = klass->FindInterfaceMethod(name, signature); 4133 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4134 break; 4135 case kSuper: // Fall-through. 4136 case kVirtual: 4137 resolved = klass->FindVirtualMethod(name, signature); 4138 break; 4139 } 4140 } 4141 if (resolved != NULL) { 4142 // We found a method, check for incompatible class changes. 4143 if (resolved->CheckIncompatibleClassChange(type)) { 4144 resolved = NULL; 4145 } 4146 } 4147 if (resolved != NULL) { 4148 // Be a good citizen and update the dex cache to speed subsequent calls. 4149 dex_cache->SetResolvedMethod(method_idx, resolved); 4150 return resolved; 4151 } else { 4152 // We failed to find the method which means either an access error, an incompatible class 4153 // change, or no such method. First try to find the method among direct and virtual methods. 4154 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4155 const Signature signature = dex_file.GetMethodSignature(method_id); 4156 switch (type) { 4157 case kDirect: 4158 case kStatic: 4159 resolved = klass->FindVirtualMethod(name, signature); 4160 break; 4161 case kInterface: 4162 case kVirtual: 4163 case kSuper: 4164 resolved = klass->FindDirectMethod(name, signature); 4165 break; 4166 } 4167 4168 // If we found something, check that it can be accessed by the referrer. 4169 if (resolved != NULL && referrer != NULL) { 4170 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4171 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4172 if (!referring_class->CanAccess(methods_class)) { 4173 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4174 referrer, resolved, type); 4175 return NULL; 4176 } else if (!referring_class->CanAccessMember(methods_class, 4177 resolved->GetAccessFlags())) { 4178 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4179 return NULL; 4180 } 4181 } 4182 4183 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4184 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4185 switch (type) { 4186 case kDirect: 4187 case kStatic: 4188 if (resolved != NULL) { 4189 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4190 } else { 4191 resolved = klass->FindInterfaceMethod(name, signature); 4192 if (resolved != NULL) { 4193 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4194 } else { 4195 ThrowNoSuchMethodError(type, klass, name, signature); 4196 } 4197 } 4198 break; 4199 case kInterface: 4200 if (resolved != NULL) { 4201 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4202 } else { 4203 resolved = klass->FindVirtualMethod(name, signature); 4204 if (resolved != NULL) { 4205 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4206 } else { 4207 ThrowNoSuchMethodError(type, klass, name, signature); 4208 } 4209 } 4210 break; 4211 case kSuper: 4212 ThrowNoSuchMethodError(type, klass, name, signature); 4213 break; 4214 case kVirtual: 4215 if (resolved != NULL) { 4216 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4217 } else { 4218 resolved = klass->FindInterfaceMethod(name, signature); 4219 if (resolved != NULL) { 4220 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4221 } else { 4222 ThrowNoSuchMethodError(type, klass, name, signature); 4223 } 4224 } 4225 break; 4226 } 4227 DCHECK(Thread::Current()->IsExceptionPending()); 4228 return NULL; 4229 } 4230} 4231 4232mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4233 SirtRef<mirror::DexCache>& dex_cache, 4234 SirtRef<mirror::ClassLoader>& class_loader, 4235 bool is_static) { 4236 DCHECK(dex_cache.get() != nullptr); 4237 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4238 if (resolved != NULL) { 4239 return resolved; 4240 } 4241 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4242 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4243 if (klass == NULL) { 4244 DCHECK(Thread::Current()->IsExceptionPending()); 4245 return NULL; 4246 } 4247 4248 if (is_static) { 4249 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4250 } else { 4251 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4252 } 4253 4254 if (resolved == NULL) { 4255 const char* name = dex_file.GetFieldName(field_id); 4256 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4257 if (is_static) { 4258 resolved = klass->FindStaticField(name, type); 4259 } else { 4260 resolved = klass->FindInstanceField(name, type); 4261 } 4262 if (resolved == NULL) { 4263 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4264 return NULL; 4265 } 4266 } 4267 dex_cache->SetResolvedField(field_idx, resolved); 4268 return resolved; 4269} 4270 4271mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4272 uint32_t field_idx, 4273 SirtRef<mirror::DexCache>& dex_cache, 4274 SirtRef<mirror::ClassLoader>& class_loader) { 4275 DCHECK(dex_cache.get() != nullptr); 4276 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4277 if (resolved != NULL) { 4278 return resolved; 4279 } 4280 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4281 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4282 if (klass == NULL) { 4283 DCHECK(Thread::Current()->IsExceptionPending()); 4284 return NULL; 4285 } 4286 4287 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4288 StringPiece type(dex_file.StringDataByIdx( 4289 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4290 resolved = klass->FindField(name, type); 4291 if (resolved != NULL) { 4292 dex_cache->SetResolvedField(field_idx, resolved); 4293 } else { 4294 ThrowNoSuchFieldError("", klass, type, name); 4295 } 4296 return resolved; 4297} 4298 4299const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4300 uint32_t* length) { 4301 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4302 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4303 const DexFile& dex_file = *dex_cache->GetDexFile(); 4304 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4305 return dex_file.GetMethodShorty(method_id, length); 4306} 4307 4308void ClassLinker::DumpAllClasses(int flags) { 4309 if (dex_cache_image_class_lookup_required_) { 4310 MoveImageClassesToClassTable(); 4311 } 4312 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4313 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4314 std::vector<mirror::Class*> all_classes; 4315 { 4316 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4317 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4318 all_classes.push_back(it.second); 4319 } 4320 } 4321 4322 for (size_t i = 0; i < all_classes.size(); ++i) { 4323 all_classes[i]->DumpClass(std::cerr, flags); 4324 } 4325} 4326 4327void ClassLinker::DumpForSigQuit(std::ostream& os) { 4328 if (dex_cache_image_class_lookup_required_) { 4329 MoveImageClassesToClassTable(); 4330 } 4331 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4332 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4333} 4334 4335size_t ClassLinker::NumLoadedClasses() { 4336 if (dex_cache_image_class_lookup_required_) { 4337 MoveImageClassesToClassTable(); 4338 } 4339 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4340 return class_table_.size(); 4341} 4342 4343pid_t ClassLinker::GetClassesLockOwner() { 4344 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4345} 4346 4347pid_t ClassLinker::GetDexLockOwner() { 4348 return dex_lock_.GetExclusiveOwnerTid(); 4349} 4350 4351void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4352 DCHECK(!init_done_); 4353 4354 DCHECK(klass != NULL); 4355 DCHECK(klass->GetClassLoader() == NULL); 4356 4357 DCHECK(class_roots_ != NULL); 4358 DCHECK(class_roots_->Get(class_root) == NULL); 4359 class_roots_->Set(class_root, klass); 4360} 4361 4362} // namespace art 4363