class_linker.cc revision 7fc8f90b7160e879143be5cfd6ea3df866398884
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 <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 686 const char* dex_location, 687 const uint32_t* dex_location_checksum) { 688 ReaderMutexLock mu(Thread::Current(), dex_lock_); 689 for (const OatFile* oat_file : oat_files_) { 690 DCHECK(oat_file != nullptr); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != nullptr) { 702 return oat_dex_file; 703 } 704 } 705 return nullptr; 706} 707 708 709// Loads all multi dex files from the given oat file returning true on success. 710// 711// Parameters: 712// oat_file - the oat file to load from 713// dex_location - the dex location used to generate the oat file 714// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 715// generated - whether or not the oat_file existed before or was just (re)generated 716// error_msgs - any error messages will be appended here 717// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 718static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 719 const char* dex_location, 720 const uint32_t* dex_location_checksum, 721 bool generated, 722 std::vector<std::string>* error_msgs, 723 std::vector<const DexFile*>* dex_files) { 724 if (oat_file == nullptr) { 725 return false; 726 } 727 728 size_t old_size = dex_files->size(); // To rollback on error. 729 730 bool success = true; 731 for (size_t i = 0; success; ++i) { 732 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 733 const char* next_name = next_name_str.c_str(); 734 735 uint32_t next_location_checksum; 736 uint32_t* next_location_checksum_pointer = &next_location_checksum; 737 std::string error_msg; 738 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 739 // When i=0 the multidex name should be the same as the location name. We already have the 740 // checksum it so we don't need to recompute it. 741 if (dex_location_checksum == nullptr) { 742 next_location_checksum_pointer = nullptr; 743 } else { 744 next_location_checksum = *dex_location_checksum; 745 } 746 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 747 DCHECK_EQ(false, i == 0 && generated); 748 next_location_checksum_pointer = nullptr; 749 } 750 751 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 752 753 if (oat_dex_file == nullptr) { 754 if (i == 0 && generated) { 755 std::string error_msg; 756 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 757 " file'%s'", dex_location, next_location_checksum, 758 oat_file->GetLocation().c_str()); 759 error_msgs->push_back(error_msg); 760 } 761 break; // Not found, done. 762 } 763 764 // Checksum test. Test must succeed when generated. 765 success = !generated; 766 if (next_location_checksum_pointer != nullptr) { 767 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 768 } 769 770 if (success) { 771 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 772 if (dex_file == nullptr) { 773 success = false; 774 error_msgs->push_back(error_msg); 775 } else { 776 dex_files->push_back(dex_file); 777 } 778 } 779 780 // When we generated the file, we expect success, or something is terribly wrong. 781 CHECK_EQ(false, generated && !success) 782 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 783 << std::hex << " dex_location_checksum=" << next_location_checksum 784 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 785 } 786 787 if (dex_files->size() == old_size) { 788 success = false; // We did not even find classes.dex 789 } 790 791 if (success) { 792 return true; 793 } else { 794 // Free all the dex files we have loaded. 795 auto it = dex_files->begin() + old_size; 796 auto it_end = dex_files->end(); 797 for (; it != it_end; it++) { 798 delete *it; 799 } 800 dex_files->erase(dex_files->begin() + old_size, it_end); 801 802 return false; 803 } 804} 805 806// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 807// complicates the loading process, as we should not use an iterative loading process, because that 808// would register the oat file and dex files that come before the broken one. Instead, check all 809// multidex ahead of time. 810bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 811 std::vector<std::string>* error_msgs, 812 std::vector<const DexFile*>* dex_files) { 813 // 1) Check whether we have an open oat file. 814 // This requires a dex checksum, use the "primary" one. 815 uint32_t dex_location_checksum; 816 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 817 bool have_checksum = true; 818 std::string checksum_error_msg; 819 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 820 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 821 dex_location_checksum_pointer = nullptr; 822 have_checksum = false; 823 } 824 825 bool needs_registering = false; 826 827 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 828 dex_location_checksum_pointer); 829 std::unique_ptr<const OatFile> open_oat_file( 830 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 831 832 // 2) If we do not have an open one, maybe there's one on disk already. 833 834 // In case the oat file is not open, we play a locking game here so 835 // that if two different processes race to load and register or generate 836 // (or worse, one tries to open a partial generated file) we will be okay. 837 // This is actually common with apps that use DexClassLoader to work 838 // around the dex method reference limit and that have a background 839 // service running in a separate process. 840 ScopedFlock scoped_flock; 841 842 if (open_oat_file.get() == nullptr) { 843 if (oat_location != nullptr) { 844 // Can only do this if we have a checksum, else error. 845 if (!have_checksum) { 846 error_msgs->push_back(checksum_error_msg); 847 return false; 848 } 849 850 std::string error_msg; 851 852 // We are loading or creating one in the future. Time to set up the file lock. 853 if (!scoped_flock.Init(oat_location, &error_msg)) { 854 error_msgs->push_back(error_msg); 855 return false; 856 } 857 858 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 859 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 860 oat_location, &error_msg)); 861 862 if (open_oat_file.get() == nullptr) { 863 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 864 dex_location, oat_location, error_msg.c_str()); 865 VLOG(class_linker) << compound_msg; 866 error_msgs->push_back(compound_msg); 867 } 868 } else { 869 // TODO: What to lock here? 870 bool obsolete_file_cleanup_failed; 871 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 872 dex_location_checksum_pointer, 873 kRuntimeISA, error_msgs, 874 &obsolete_file_cleanup_failed)); 875 // There's no point in going forward and eventually try to regenerate the 876 // file if we couldn't remove the obsolete one. Mostly likely we will fail 877 // with the same error when trying to write the new file. 878 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 879 if (obsolete_file_cleanup_failed) { 880 return false; 881 } 882 } 883 needs_registering = true; 884 } 885 886 // 3) If we have an oat file, check all contained multidex files for our dex_location. 887 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 888 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 889 dex_location_checksum_pointer, 890 false, error_msgs, dex_files); 891 if (success) { 892 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 893 if (needs_registering) { 894 // We opened the oat file, so we must register it. 895 RegisterOatFile(oat_file); 896 } 897 // If the file isn't executable we failed patchoat but did manage to get the dex files. 898 return oat_file->IsExecutable(); 899 } else { 900 if (needs_registering) { 901 // We opened it, delete it. 902 open_oat_file.reset(); 903 } else { 904 open_oat_file.release(); // Do not delete open oat files. 905 } 906 } 907 908 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 909 910 // Need a checksum, fail else. 911 if (!have_checksum) { 912 error_msgs->push_back(checksum_error_msg); 913 return false; 914 } 915 916 // Look in cache location if no oat_location is given. 917 std::string cache_location; 918 if (oat_location == nullptr) { 919 // Use the dalvik cache. 920 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 921 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 922 oat_location = cache_location.c_str(); 923 } 924 925 bool has_flock = true; 926 // Definitely need to lock now. 927 if (!scoped_flock.HasFile()) { 928 std::string error_msg; 929 if (!scoped_flock.Init(oat_location, &error_msg)) { 930 error_msgs->push_back(error_msg); 931 has_flock = false; 932 } 933 } 934 935 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 936 // Create the oat file. 937 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 938 oat_location, error_msgs)); 939 } 940 941 // Failed, bail. 942 if (open_oat_file.get() == nullptr) { 943 std::string error_msg; 944 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 945 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 946 error_msgs->push_back(error_msg); 947 return false; 948 } 949 950 // Try to load again, but stronger checks. 951 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 952 dex_location_checksum_pointer, 953 true, error_msgs, dex_files); 954 if (success) { 955 RegisterOatFile(open_oat_file.release()); 956 return true; 957 } else { 958 return false; 959 } 960} 961 962const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 963 uint32_t dex_location_checksum, 964 const char* oat_location, 965 std::string* error_msg) { 966 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 967 !Runtime::Current()->IsCompiler(), 968 error_msg)); 969 if (oat_file.get() == nullptr) { 970 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 971 error_msg->c_str()); 972 return nullptr; 973 } 974 Runtime* runtime = Runtime::Current(); 975 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 976 if (image_space != nullptr) { 977 const ImageHeader& image_header = image_space->GetImageHeader(); 978 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 979 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 980 if (expected_image_oat_checksum != actual_image_oat_checksum) { 981 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 982 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 983 actual_image_oat_checksum); 984 return nullptr; 985 } 986 987 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 988 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 989 if (expected_image_oat_offset != actual_image_oat_offset) { 990 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 991 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 992 actual_image_oat_offset); 993 return nullptr; 994 } 995 int32_t expected_patch_delta = image_header.GetPatchDelta(); 996 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 997 if (expected_patch_delta != actual_patch_delta) { 998 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 999 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1000 return nullptr; 1001 } 1002 } 1003 1004 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1005 &dex_location_checksum); 1006 if (oat_dex_file == nullptr) { 1007 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1008 dex_location); 1009 return nullptr; 1010 } 1011 uint32_t expected_dex_checksum = dex_location_checksum; 1012 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1013 if (expected_dex_checksum != actual_dex_checksum) { 1014 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1015 "found 0x%x", oat_location, expected_dex_checksum, 1016 actual_dex_checksum); 1017 return nullptr; 1018 } 1019 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1020 if (dex_file.get() != nullptr) { 1021 return oat_file.release(); 1022 } else { 1023 return nullptr; 1024 } 1025} 1026 1027const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1028 int fd, const char* oat_location, 1029 std::vector<std::string>* error_msgs) { 1030 // Generate the output oat file for the dex file 1031 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1032 std::string error_msg; 1033 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1034 CHECK(!error_msg.empty()); 1035 error_msgs->push_back(error_msg); 1036 return nullptr; 1037 } 1038 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1039 !Runtime::Current()->IsCompiler(), 1040 &error_msg)); 1041 if (oat_file.get() == nullptr) { 1042 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1043 oat_location, error_msg.c_str()); 1044 error_msgs->push_back(compound_msg); 1045 return nullptr; 1046 } 1047 1048 return oat_file.release(); 1049} 1050 1051bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1052 const InstructionSet instruction_set) { 1053 Runtime* runtime = Runtime::Current(); 1054 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1055 if (image_space == nullptr) { 1056 return false; 1057 } 1058 uint32_t image_oat_checksum = 0; 1059 if (instruction_set == kRuntimeISA) { 1060 const ImageHeader& image_header = image_space->GetImageHeader(); 1061 image_oat_checksum = image_header.GetOatChecksum(); 1062 } else { 1063 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1064 image_space->GetImageLocation().c_str(), instruction_set)); 1065 image_oat_checksum = image_header->GetOatChecksum(); 1066 } 1067 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1068} 1069 1070bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1071 const InstructionSet instruction_set, 1072 std::string* error_msg) { 1073 Runtime* runtime = Runtime::Current(); 1074 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1075 if (image_space == nullptr) { 1076 *error_msg = "No image space for verification against"; 1077 return false; 1078 } 1079 1080 // If the requested instruction set is the same as the current runtime, 1081 // we can use the checksums directly. If it isn't, we'll have to read the 1082 // image header from the image for the right instruction set. 1083 uint32_t image_oat_checksum = 0; 1084 uintptr_t image_oat_data_begin = 0; 1085 int32_t image_patch_delta = 0; 1086 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1087 const ImageHeader& image_header = image_space->GetImageHeader(); 1088 image_oat_checksum = image_header.GetOatChecksum(); 1089 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1090 image_patch_delta = image_header.GetPatchDelta(); 1091 } else { 1092 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1093 image_space->GetImageLocation().c_str(), instruction_set)); 1094 image_oat_checksum = image_header->GetOatChecksum(); 1095 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1096 image_patch_delta = image_header->GetPatchDelta(); 1097 } 1098 const OatHeader& oat_header = oat_file->GetOatHeader(); 1099 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1100 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1101 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1102 if (!ret) { 1103 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1104 oat_file->GetLocation().c_str(), 1105 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1106 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1107 oat_file->GetOatHeader().GetImagePatchDelta(), 1108 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1109 } 1110 return ret; 1111} 1112 1113bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1114 const char* dex_location, 1115 uint32_t dex_location_checksum, 1116 const InstructionSet instruction_set, 1117 std::string* error_msg) { 1118 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1119 return false; 1120 } 1121 1122 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1123 &dex_location_checksum); 1124 if (oat_dex_file == NULL) { 1125 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1126 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1127 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1128 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1129 oat_file->GetLocation().c_str(), 1130 oat_dex_file->GetDexFileLocation().c_str(), 1131 oat_dex_file->GetDexFileLocationChecksum()); 1132 } 1133 return false; 1134 } 1135 1136 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1137 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1138 oat_file->GetLocation().c_str(), 1139 oat_dex_file->GetDexFileLocationChecksum(), 1140 dex_location, dex_location_checksum); 1141 return false; 1142 } 1143 return true; 1144} 1145 1146bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1147 const char* dex_location, 1148 const uint32_t* dex_location_checksum, 1149 std::string* error_msg) { 1150 CHECK(oat_file != nullptr); 1151 CHECK(dex_location != nullptr); 1152 std::unique_ptr<const DexFile> dex_file; 1153 if (dex_location_checksum == nullptr) { 1154 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1155 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1156 // directory. 1157 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1158 if (oat_dex_file == nullptr) { 1159 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1160 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1161 error_msg->c_str()); 1162 return false; 1163 } 1164 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1165 } else { 1166 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1167 kRuntimeISA, error_msg); 1168 if (!verified) { 1169 return false; 1170 } 1171 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1172 dex_location_checksum)->OpenDexFile(error_msg)); 1173 } 1174 return dex_file.get() != nullptr; 1175} 1176 1177const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1178 const char* dex_location, 1179 const uint32_t* dex_location_checksum, 1180 InstructionSet isa, 1181 std::vector<std::string>* error_msgs, 1182 bool* obsolete_file_cleanup_failed) { 1183 *obsolete_file_cleanup_failed = false; 1184 bool already_opened = false; 1185 std::string dex_location_str(dex_location); 1186 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1187 &already_opened, 1188 obsolete_file_cleanup_failed, 1189 error_msgs)); 1190 std::string error_msg; 1191 if (oat_file.get() == nullptr) { 1192 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1193 dex_location)); 1194 return nullptr; 1195 } else if (oat_file->IsExecutable() && 1196 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1197 dex_location_checksum, &error_msg)) { 1198 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1199 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1200 error_msg.c_str())); 1201 return nullptr; 1202 } else if (!oat_file->IsExecutable() && 1203 Runtime::Current()->GetHeap()->HasImageSpace() && 1204 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1205 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1206 "dex location '%s'. Image checksum incorrect.", 1207 oat_file->GetLocation().c_str(), dex_location)); 1208 return nullptr; 1209 } else { 1210 return oat_file.release(); 1211 } 1212} 1213 1214const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1215 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1216 for (size_t i = 0; i < oat_files_.size(); i++) { 1217 const OatFile* oat_file = oat_files_[i]; 1218 DCHECK(oat_file != nullptr); 1219 if (oat_file->GetLocation() == oat_location) { 1220 return oat_file; 1221 } 1222 } 1223 return nullptr; 1224} 1225 1226const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1227 InstructionSet isa, 1228 bool *already_opened, 1229 bool *obsolete_file_cleanup_failed, 1230 std::vector<std::string>* error_msgs) { 1231 // Find out if we've already opened the file 1232 const OatFile* ret = nullptr; 1233 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1234 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1235 if (ret != nullptr) { 1236 *already_opened = true; 1237 return ret; 1238 } 1239 1240 std::string dalvik_cache; 1241 bool have_android_data = false; 1242 bool have_dalvik_cache = false; 1243 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1244 &have_android_data, &have_dalvik_cache); 1245 std::string cache_filename; 1246 if (have_dalvik_cache) { 1247 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1248 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1249 if (ret != nullptr) { 1250 *already_opened = true; 1251 return ret; 1252 } 1253 } else { 1254 // If we need to relocate we should just place odex back where it started. 1255 cache_filename = odex_filename; 1256 } 1257 1258 ret = nullptr; 1259 1260 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1261 // 1262 // Now we do the following: 1263 // 1) Try and open the odex version 1264 // 2) If present, checksum-verified & relocated correctly return it 1265 // 3) Close the odex version to free up its address space. 1266 // 4) Try and open the cache version 1267 // 5) If present, checksum-verified & relocated correctly return it 1268 // 6) Close the cache version to free up its address space. 1269 // 7) If we should relocate: 1270 // a) If we have opened and checksum-verified the odex version relocate it to 1271 // 'cache_filename' and return it 1272 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1273 // it. This should not happen often (I think only the run-test's will hit this case). 1274 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1275 // this point. 1276 // 9) Return nullptr 1277 1278 *already_opened = false; 1279 const Runtime* runtime = Runtime::Current(); 1280 CHECK(runtime != nullptr); 1281 bool executable = !runtime->IsCompiler(); 1282 1283 std::string odex_error_msg; 1284 bool should_patch_system = false; 1285 bool odex_checksum_verified = false; 1286 bool have_system_odex = false; 1287 { 1288 // There is a high probability that these both these oat files map similar/the same address 1289 // spaces so we must scope them like this so they each gets its turn. 1290 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1291 executable, &odex_error_msg)); 1292 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1293 &odex_checksum_verified, 1294 &odex_error_msg)) { 1295 error_msgs->push_back(odex_error_msg); 1296 return odex_oat_file.release(); 1297 } else { 1298 if (odex_checksum_verified) { 1299 // We can just relocate 1300 should_patch_system = true; 1301 odex_error_msg = "Image Patches are incorrect"; 1302 } 1303 if (odex_oat_file.get() != nullptr) { 1304 have_system_odex = true; 1305 } 1306 } 1307 } 1308 1309 std::string cache_error_msg; 1310 bool should_patch_cache = false; 1311 bool cache_checksum_verified = false; 1312 if (have_dalvik_cache) { 1313 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1314 executable, &cache_error_msg)); 1315 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1316 &cache_checksum_verified, 1317 &cache_error_msg)) { 1318 error_msgs->push_back(cache_error_msg); 1319 return cache_oat_file.release(); 1320 } else if (cache_checksum_verified) { 1321 // We can just relocate 1322 should_patch_cache = true; 1323 cache_error_msg = "Image Patches are incorrect"; 1324 } 1325 } else if (have_android_data) { 1326 // dalvik_cache does not exist but android data does. This means we should be able to create 1327 // it, so we should try. 1328 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1329 } 1330 1331 ret = nullptr; 1332 std::string error_msg; 1333 if (runtime->CanRelocate()) { 1334 // Run relocation 1335 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1336 if (space != nullptr) { 1337 const std::string& image_location = space->GetImageLocation(); 1338 if (odex_checksum_verified && should_patch_system) { 1339 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1340 } else if (cache_checksum_verified && should_patch_cache) { 1341 CHECK(have_dalvik_cache); 1342 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1343 } 1344 } else if (have_system_odex) { 1345 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1346 } 1347 } 1348 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1349 // implicitly: were able to fine where the cached version is but we were unable to use it, 1350 // either as a destination for relocation or to open a file. We should delete it if it is 1351 // there. 1352 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1353 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1354 "searching for dex file %s: %s", 1355 cache_filename.c_str(), dex_location.c_str(), 1356 strerror(errno)); 1357 error_msgs->push_back(rm_error_msg); 1358 VLOG(class_linker) << rm_error_msg; 1359 // Let the caller know that we couldn't remove the obsolete file. 1360 // This is a good indication that further writes may fail as well. 1361 *obsolete_file_cleanup_failed = true; 1362 } 1363 } 1364 if (ret == nullptr) { 1365 VLOG(class_linker) << error_msg; 1366 error_msgs->push_back(error_msg); 1367 std::string relocation_msg; 1368 if (runtime->CanRelocate()) { 1369 relocation_msg = StringPrintf(" and relocation failed"); 1370 } 1371 if (have_dalvik_cache && cache_checksum_verified) { 1372 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1373 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1374 cache_filename.c_str(), cache_error_msg.c_str(), 1375 relocation_msg.c_str()); 1376 } else { 1377 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1378 "dalvik_cache availible)%s.", odex_filename.c_str(), 1379 odex_error_msg.c_str(), relocation_msg.c_str()); 1380 } 1381 VLOG(class_linker) << error_msg; 1382 error_msgs->push_back(error_msg); 1383 } 1384 return ret; 1385} 1386 1387const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1388 InstructionSet isa, 1389 std::string* error_msg) { 1390 // We open it non-executable 1391 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1392 if (output.get() == nullptr) { 1393 return nullptr; 1394 } 1395 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1396 VerifyOatImageChecksum(output.get(), isa)) { 1397 return output.release(); 1398 } else { 1399 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1400 oat_path.c_str()); 1401 return nullptr; 1402 } 1403} 1404 1405const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1406 const std::string& output_oat, 1407 const std::string& image_location, 1408 InstructionSet isa, 1409 std::string* error_msg) { 1410 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1411 // We don't have an image space so there is no point in trying to patchoat. 1412 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1413 << "running without an image. Attempting to use oat file for interpretation."; 1414 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1415 } 1416 if (!Runtime::Current()->IsDex2OatEnabled()) { 1417 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1418 // input_oat but make sure we only do interpretation on it's dex files. 1419 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1420 << "disabled. Attempting to use oat file for interpretation"; 1421 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1422 } 1423 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1424 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1425 1426 std::string isa_arg("--instruction-set="); 1427 isa_arg += GetInstructionSetString(isa); 1428 std::string input_oat_filename_arg("--input-oat-file="); 1429 input_oat_filename_arg += input_oat; 1430 std::string output_oat_filename_arg("--output-oat-file="); 1431 output_oat_filename_arg += output_oat; 1432 std::string patched_image_arg("--patched-image-location="); 1433 patched_image_arg += image_location; 1434 1435 std::vector<std::string> argv; 1436 argv.push_back(patchoat); 1437 argv.push_back(isa_arg); 1438 argv.push_back(input_oat_filename_arg); 1439 argv.push_back(output_oat_filename_arg); 1440 argv.push_back(patched_image_arg); 1441 1442 std::string command_line(Join(argv, ' ')); 1443 LOG(INFO) << "Relocate Oat File: " << command_line; 1444 bool success = Exec(argv, error_msg); 1445 if (success) { 1446 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1447 !Runtime::Current()->IsCompiler(), error_msg)); 1448 bool checksum_verified = false; 1449 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1450 return output.release(); 1451 } else if (output.get() != nullptr) { 1452 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1453 "but output file '%s' failed verifcation: %s", 1454 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1455 } else { 1456 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1457 "but was unable to open output file '%s': %s", 1458 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1459 } 1460 } else if (!Runtime::Current()->IsCompiler()) { 1461 // patchoat failed which means we probably don't have enough room to place the output oat file, 1462 // instead of failing we should just run the interpreter from the dex files in the input oat. 1463 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1464 << "for interpretation. patchoat failure was: " << *error_msg; 1465 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1466 } else { 1467 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1468 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1469 error_msg->c_str()); 1470 } 1471 return nullptr; 1472} 1473 1474int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1475 Runtime* runtime = Runtime::Current(); 1476 int32_t real_patch_delta; 1477 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1478 CHECK(image_space != nullptr); 1479 if (isa == Runtime::Current()->GetInstructionSet()) { 1480 const ImageHeader& image_header = image_space->GetImageHeader(); 1481 real_patch_delta = image_header.GetPatchDelta(); 1482 } else { 1483 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1484 image_space->GetImageLocation().c_str(), isa)); 1485 real_patch_delta = image_header->GetPatchDelta(); 1486 } 1487 const OatHeader& oat_header = oat_file->GetOatHeader(); 1488 return real_patch_delta - oat_header.GetImagePatchDelta(); 1489} 1490 1491bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1492 bool* checksum_verified, 1493 std::string* error_msg) { 1494 std::string compound_msg("Oat file failed to verify: "); 1495 Runtime* runtime = Runtime::Current(); 1496 uint32_t real_image_checksum; 1497 void* real_image_oat_offset; 1498 int32_t real_patch_delta; 1499 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1500 if (image_space == nullptr) { 1501 *error_msg = "No image space present"; 1502 return false; 1503 } 1504 if (isa == Runtime::Current()->GetInstructionSet()) { 1505 const ImageHeader& image_header = image_space->GetImageHeader(); 1506 real_image_checksum = image_header.GetOatChecksum(); 1507 real_image_oat_offset = image_header.GetOatDataBegin(); 1508 real_patch_delta = image_header.GetPatchDelta(); 1509 } else { 1510 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1511 image_space->GetImageLocation().c_str(), isa)); 1512 real_image_checksum = image_header->GetOatChecksum(); 1513 real_image_oat_offset = image_header->GetOatDataBegin(); 1514 real_patch_delta = image_header->GetPatchDelta(); 1515 } 1516 1517 const OatHeader& oat_header = oat_file->GetOatHeader(); 1518 1519 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1520 *checksum_verified = oat_image_checksum == real_image_checksum; 1521 if (!*checksum_verified) { 1522 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1523 real_image_checksum, oat_image_checksum); 1524 } 1525 1526 void* oat_image_oat_offset = 1527 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1528 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1529 if (!offset_verified) { 1530 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1531 real_image_oat_offset, oat_image_oat_offset); 1532 } 1533 1534 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1535 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1536 if (!patch_delta_verified) { 1537 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1538 real_patch_delta, oat_patch_delta); 1539 } 1540 1541 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1542 if (ret) { 1543 *error_msg = compound_msg; 1544 } 1545 return ret; 1546} 1547 1548const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1549 std::string* error_msg) { 1550 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1551 if (oat_file != nullptr) { 1552 return oat_file; 1553 } 1554 1555 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1556 error_msg); 1557 if (oat_file == NULL) { 1558 return NULL; 1559 } 1560 return oat_file; 1561} 1562 1563static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1564 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1565 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1566 1567 DCHECK(obj != NULL); 1568 DCHECK(class_linker != NULL); 1569 1570 if (obj->IsArtMethod()) { 1571 mirror::ArtMethod* method = obj->AsArtMethod(); 1572 if (!method->IsNative()) { 1573 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1574 if (method != Runtime::Current()->GetResolutionMethod()) { 1575 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1576 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1577 } 1578 } 1579 } 1580} 1581 1582void ClassLinker::InitFromImage() { 1583 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1584 CHECK(!init_done_); 1585 1586 Thread* self = Thread::Current(); 1587 gc::Heap* heap = Runtime::Current()->GetHeap(); 1588 gc::space::ImageSpace* space = heap->GetImageSpace(); 1589 dex_cache_image_class_lookup_required_ = true; 1590 CHECK(space != NULL); 1591 OatFile& oat_file = GetImageOatFile(space); 1592 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1593 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1594 const char* image_file_location = oat_file.GetOatHeader(). 1595 GetStoreValueByKey(OatHeader::kImageLocationKey); 1596 CHECK(image_file_location == nullptr || *image_file_location == 0); 1597 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1598 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1599 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1600 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1601 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1602 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1603 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1604 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1605 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1606 1607 StackHandleScope<1> hs(self); 1608 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1609 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1610 AsObjectArray<mirror::Class>())); 1611 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1612 1613 // Special case of setting up the String class early so that we can test arbitrary objects 1614 // as being Strings or not 1615 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1616 1617 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1618 static_cast<uint32_t>(dex_caches->GetLength())); 1619 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1620 StackHandleScope<1> hs(self); 1621 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1622 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1623 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1624 nullptr); 1625 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1626 std::string error_msg; 1627 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1628 if (dex_file == NULL) { 1629 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1630 << " from within oat file " << oat_file.GetLocation() 1631 << " error '" << error_msg << "'"; 1632 } 1633 1634 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1635 1636 AppendToBootClassPath(*dex_file, dex_cache); 1637 } 1638 1639 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1640 // bitmap walk. 1641 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1642 1643 // Set entry point to interpreter if in InterpretOnly mode. 1644 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1645 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1646 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1647 } 1648 1649 // reinit class_roots_ 1650 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1651 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1652 1653 // reinit array_iftable_ from any array class instance, they should be == 1654 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1655 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1656 // String class root was set above 1657 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1658 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1659 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1660 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1661 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1662 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1663 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1664 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1665 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1666 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1667 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1668 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1669 1670 FinishInit(self); 1671 1672 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1673} 1674 1675void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1676 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1677 if ((flags & kVisitRootFlagAllRoots) != 0) { 1678 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1679 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1680 } 1681 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1682 for (auto& pair : new_class_roots_) { 1683 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1684 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1685 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1686 if (UNLIKELY(new_ref != old_ref)) { 1687 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1688 // corresponding object. This is slow, but luckily for us, this may only happen with a 1689 // concurrent moving GC. 1690 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1691 it != end && it->first == pair.first; ++it) { 1692 // If the class stored matches the old class, update it to the new value. 1693 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1694 it->second = GcRoot<mirror::Class>(new_ref); 1695 } 1696 } 1697 } 1698 } 1699 } 1700 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1701 new_class_roots_.clear(); 1702 } 1703 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1704 log_new_class_table_roots_ = true; 1705 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1706 log_new_class_table_roots_ = false; 1707 } 1708 // We deliberately ignore the class roots in the image since we 1709 // handle image roots by using the MS/CMS rescanning of dirty cards. 1710} 1711 1712// Keep in sync with InitCallback. Anything we visit, we need to 1713// reinit references to when reinitializing a ClassLinker from a 1714// mapped image. 1715void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1716 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1717 Thread* self = Thread::Current(); 1718 { 1719 ReaderMutexLock mu(self, dex_lock_); 1720 if ((flags & kVisitRootFlagAllRoots) != 0) { 1721 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1722 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1723 } 1724 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1725 for (size_t index : new_dex_cache_roots_) { 1726 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1727 } 1728 } 1729 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1730 new_dex_cache_roots_.clear(); 1731 } 1732 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1733 log_new_dex_caches_roots_ = true; 1734 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1735 log_new_dex_caches_roots_ = false; 1736 } 1737 } 1738 VisitClassRoots(callback, arg, flags); 1739 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1740 DCHECK(!array_iftable_.IsNull()); 1741 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1742 if (!find_array_class_cache_[i].IsNull()) { 1743 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1744 } 1745 } 1746} 1747 1748void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1749 if (dex_cache_image_class_lookup_required_) { 1750 MoveImageClassesToClassTable(); 1751 } 1752 // TODO: why isn't this a ReaderMutexLock? 1753 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1754 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1755 mirror::Class* c = it.second.Read(); 1756 if (!visitor(c, arg)) { 1757 return; 1758 } 1759 } 1760} 1761 1762static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1763 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1764 classes->insert(c); 1765 return true; 1766} 1767 1768struct GetClassesVisitorArrayArg { 1769 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1770 int32_t index; 1771 bool success; 1772}; 1773 1774static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1775 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1776 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1777 if (arg->index < (*arg->classes)->GetLength()) { 1778 (*arg->classes)->Set(arg->index, c); 1779 arg->index++; 1780 return true; 1781 } else { 1782 arg->success = false; 1783 return false; 1784 } 1785} 1786 1787void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1788 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1789 // is avoiding duplicates. 1790 if (!kMovingClasses) { 1791 std::set<mirror::Class*> classes; 1792 VisitClasses(GetClassesVisitorSet, &classes); 1793 for (mirror::Class* klass : classes) { 1794 if (!visitor(klass, arg)) { 1795 return; 1796 } 1797 } 1798 } else { 1799 Thread* self = Thread::Current(); 1800 StackHandleScope<1> hs(self); 1801 Handle<mirror::ObjectArray<mirror::Class>> classes = 1802 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1803 GetClassesVisitorArrayArg local_arg; 1804 local_arg.classes = &classes; 1805 local_arg.success = false; 1806 // We size the array assuming classes won't be added to the class table during the visit. 1807 // If this assumption fails we iterate again. 1808 while (!local_arg.success) { 1809 size_t class_table_size; 1810 { 1811 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1812 class_table_size = class_table_.size(); 1813 } 1814 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1815 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1816 classes.Assign( 1817 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1818 CHECK(classes.Get() != nullptr); // OOME. 1819 local_arg.index = 0; 1820 local_arg.success = true; 1821 VisitClasses(GetClassesVisitorArray, &local_arg); 1822 } 1823 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1824 // If the class table shrank during creation of the clases array we expect null elements. If 1825 // the class table grew then the loop repeats. If classes are created after the loop has 1826 // finished then we don't visit. 1827 mirror::Class* klass = classes->Get(i); 1828 if (klass != nullptr && !visitor(klass, arg)) { 1829 return; 1830 } 1831 } 1832 } 1833} 1834 1835ClassLinker::~ClassLinker() { 1836 mirror::Class::ResetClass(); 1837 mirror::String::ResetClass(); 1838 mirror::Reference::ResetClass(); 1839 mirror::ArtField::ResetClass(); 1840 mirror::ArtMethod::ResetClass(); 1841 mirror::BooleanArray::ResetArrayClass(); 1842 mirror::ByteArray::ResetArrayClass(); 1843 mirror::CharArray::ResetArrayClass(); 1844 mirror::DoubleArray::ResetArrayClass(); 1845 mirror::FloatArray::ResetArrayClass(); 1846 mirror::IntArray::ResetArrayClass(); 1847 mirror::LongArray::ResetArrayClass(); 1848 mirror::ShortArray::ResetArrayClass(); 1849 mirror::Throwable::ResetClass(); 1850 mirror::StackTraceElement::ResetClass(); 1851 STLDeleteElements(&boot_class_path_); 1852 STLDeleteElements(&oat_files_); 1853} 1854 1855mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1856 gc::Heap* heap = Runtime::Current()->GetHeap(); 1857 StackHandleScope<16> hs(self); 1858 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1859 Handle<mirror::DexCache> dex_cache( 1860 hs.NewHandle(down_cast<mirror::DexCache*>( 1861 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1862 VoidFunctor())))); 1863 if (dex_cache.Get() == NULL) { 1864 return NULL; 1865 } 1866 Handle<mirror::String> 1867 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1868 if (location.Get() == NULL) { 1869 return NULL; 1870 } 1871 Handle<mirror::ObjectArray<mirror::String>> 1872 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1873 if (strings.Get() == NULL) { 1874 return NULL; 1875 } 1876 Handle<mirror::ObjectArray<mirror::Class>> 1877 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1878 if (types.Get() == NULL) { 1879 return NULL; 1880 } 1881 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1882 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1883 if (methods.Get() == NULL) { 1884 return NULL; 1885 } 1886 Handle<mirror::ObjectArray<mirror::ArtField>> 1887 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1888 if (fields.Get() == NULL) { 1889 return NULL; 1890 } 1891 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1892 fields.Get()); 1893 return dex_cache.Get(); 1894} 1895 1896mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1897 uint32_t class_size) { 1898 DCHECK_GE(class_size, sizeof(mirror::Class)); 1899 gc::Heap* heap = Runtime::Current()->GetHeap(); 1900 mirror::Class::InitializeClassVisitor visitor(class_size); 1901 mirror::Object* k = kMovingClasses ? 1902 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1903 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1904 if (UNLIKELY(k == nullptr)) { 1905 CHECK(self->IsExceptionPending()); // OOME. 1906 return nullptr; 1907 } 1908 return k->AsClass(); 1909} 1910 1911mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1912 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1913} 1914 1915mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1916 return down_cast<mirror::ArtField*>( 1917 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1918} 1919 1920mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1921 return down_cast<mirror::ArtMethod*>( 1922 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1923} 1924 1925mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1926 Thread* self, size_t length) { 1927 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1928 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1929} 1930 1931mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1932 mirror::Class* klass) { 1933 DCHECK(klass != NULL); 1934 1935 // For temporary classes we must wait for them to be retired. 1936 if (init_done_ && klass->IsTemp()) { 1937 CHECK(!klass->IsResolved()); 1938 if (klass->IsErroneous()) { 1939 ThrowEarlierClassFailure(klass); 1940 return nullptr; 1941 } 1942 StackHandleScope<1> hs(self); 1943 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1944 ObjectLock<mirror::Class> lock(self, h_class); 1945 // Loop and wait for the resolving thread to retire this class. 1946 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1947 lock.WaitIgnoringInterrupts(); 1948 } 1949 if (h_class->IsErroneous()) { 1950 ThrowEarlierClassFailure(h_class.Get()); 1951 return nullptr; 1952 } 1953 CHECK(h_class->IsRetired()); 1954 // Get the updated class from class table. 1955 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1956 } 1957 1958 // Wait for the class if it has not already been linked. 1959 if (!klass->IsResolved() && !klass->IsErroneous()) { 1960 StackHandleScope<1> hs(self); 1961 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1962 ObjectLock<mirror::Class> lock(self, h_class); 1963 // Check for circular dependencies between classes. 1964 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1965 ThrowClassCircularityError(h_class.Get()); 1966 h_class->SetStatus(mirror::Class::kStatusError, self); 1967 return nullptr; 1968 } 1969 // Wait for the pending initialization to complete. 1970 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1971 lock.WaitIgnoringInterrupts(); 1972 } 1973 } 1974 1975 if (klass->IsErroneous()) { 1976 ThrowEarlierClassFailure(klass); 1977 return nullptr; 1978 } 1979 // Return the loaded class. No exceptions should be pending. 1980 CHECK(klass->IsResolved()) << PrettyClass(klass); 1981 self->AssertNoPendingException(); 1982 return klass; 1983} 1984 1985typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1986 1987// Search a collection of DexFiles for a descriptor 1988ClassPathEntry FindInClassPath(const char* descriptor, 1989 const std::vector<const DexFile*>& class_path) { 1990 for (size_t i = 0; i != class_path.size(); ++i) { 1991 const DexFile* dex_file = class_path[i]; 1992 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1993 if (dex_class_def != NULL) { 1994 return ClassPathEntry(dex_file, dex_class_def); 1995 } 1996 } 1997 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1998 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 1999 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 2000} 2001 2002mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2003 Thread* self, const char* descriptor, 2004 Handle<mirror::ClassLoader> class_loader) { 2005 if (class_loader->GetClass() != 2006 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2007 class_loader->GetParent()->GetClass() != 2008 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2009 return nullptr; 2010 } 2011 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2012 // Check if this would be found in the parent boot class loader. 2013 if (pair.second != nullptr) { 2014 mirror::Class* klass = LookupClass(descriptor, nullptr); 2015 if (klass != nullptr) { 2016 return EnsureResolved(self, descriptor, klass); 2017 } 2018 klass = DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2019 *pair.second); 2020 if (klass != nullptr) { 2021 return klass; 2022 } 2023 CHECK(self->IsExceptionPending()) << descriptor; 2024 self->ClearException(); 2025 } else { 2026 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2027 StackHandleScope<3> hs(self); 2028 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2029 // We need to get the DexPathList and loop through it. 2030 Handle<mirror::ArtField> cookie_field = 2031 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2032 Handle<mirror::ArtField> dex_file_field = 2033 hs.NewHandle( 2034 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2035 mirror::Object* dex_path_list = 2036 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2037 GetObject(class_loader.Get()); 2038 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2039 cookie_field.Get() != nullptr) { 2040 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2041 mirror::Object* dex_elements_obj = 2042 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2043 GetObject(dex_path_list); 2044 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2045 // at the mCookie which is a DexFile vector. 2046 if (dex_elements_obj != nullptr) { 2047 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2048 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2049 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2050 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2051 if (element == nullptr) { 2052 // Should never happen, fall back to java code to throw a NPE. 2053 break; 2054 } 2055 mirror::Object* dex_file = dex_file_field->GetObject(element); 2056 if (dex_file != nullptr) { 2057 const uint64_t cookie = cookie_field->GetLong(dex_file); 2058 auto* dex_files = 2059 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2060 if (dex_files == nullptr) { 2061 // This should never happen so log a warning. 2062 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2063 break; 2064 } 2065 for (const DexFile* dex_file : *dex_files) { 2066 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2067 if (dex_class_def != nullptr) { 2068 RegisterDexFile(*dex_file); 2069 mirror::Class* klass = 2070 DefineClass(descriptor, class_loader, *dex_file, *dex_class_def); 2071 if (klass == nullptr) { 2072 CHECK(self->IsExceptionPending()) << descriptor; 2073 self->ClearException(); 2074 return nullptr; 2075 } 2076 return klass; 2077 } 2078 } 2079 } 2080 } 2081 } 2082 } 2083 } 2084 return nullptr; 2085} 2086 2087mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2088 Handle<mirror::ClassLoader> class_loader) { 2089 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2090 DCHECK(self != nullptr); 2091 self->AssertNoPendingException(); 2092 if (descriptor[1] == '\0') { 2093 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2094 // for primitive classes that aren't backed by dex files. 2095 return FindPrimitiveClass(descriptor[0]); 2096 } 2097 // Find the class in the loaded classes table. 2098 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2099 if (klass != nullptr) { 2100 return EnsureResolved(self, descriptor, klass); 2101 } 2102 // Class is not yet loaded. 2103 if (descriptor[0] == '[') { 2104 return CreateArrayClass(self, descriptor, class_loader); 2105 } else if (class_loader.Get() == nullptr) { 2106 // The boot class loader, search the boot class path. 2107 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2108 if (pair.second != nullptr) { 2109 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2110 } else { 2111 // The boot class loader is searched ahead of the application class loader, failures are 2112 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2113 // trigger the chaining with a proper stack trace. 2114 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2115 self->SetException(ThrowLocation(), pre_allocated); 2116 return nullptr; 2117 } 2118 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2119 // First try with the bootstrap class loader. 2120 if (class_loader.Get() != nullptr) { 2121 klass = LookupClass(descriptor, nullptr); 2122 if (klass != nullptr) { 2123 return EnsureResolved(self, descriptor, klass); 2124 } 2125 } 2126 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2127 // a NoClassDefFoundError being allocated. 2128 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2129 if (pair.second != nullptr) { 2130 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2131 } 2132 // Next try the compile time class path. 2133 const std::vector<const DexFile*>* class_path; 2134 { 2135 ScopedObjectAccessUnchecked soa(self); 2136 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2137 soa.AddLocalReference<jobject>(class_loader.Get())); 2138 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2139 } 2140 pair = FindInClassPath(descriptor, *class_path); 2141 if (pair.second != nullptr) { 2142 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2143 } 2144 } else { 2145 ScopedObjectAccessUnchecked soa(self); 2146 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2147 if (klass != nullptr) { 2148 return klass; 2149 } 2150 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2151 soa.AddLocalReference<jobject>(class_loader.Get())); 2152 std::string class_name_string(DescriptorToDot(descriptor)); 2153 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2154 { 2155 ScopedThreadStateChange tsc(self, kNative); 2156 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2157 soa.Env()->NewStringUTF(class_name_string.c_str())); 2158 if (class_name_object.get() == nullptr) { 2159 DCHECK(self->IsExceptionPending()); // OOME. 2160 return nullptr; 2161 } 2162 CHECK(class_loader_object.get() != nullptr); 2163 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2164 WellKnownClasses::java_lang_ClassLoader_loadClass, 2165 class_name_object.get())); 2166 } 2167 if (self->IsExceptionPending()) { 2168 // If the ClassLoader threw, pass that exception up. 2169 return nullptr; 2170 } else if (result.get() == nullptr) { 2171 // broken loader - throw NPE to be compatible with Dalvik 2172 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2173 class_name_string.c_str()).c_str()); 2174 return nullptr; 2175 } else { 2176 // success, return mirror::Class* 2177 return soa.Decode<mirror::Class*>(result.get()); 2178 } 2179 } 2180 2181 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2182 return nullptr; 2183} 2184 2185mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2186 Handle<mirror::ClassLoader> class_loader, 2187 const DexFile& dex_file, 2188 const DexFile::ClassDef& dex_class_def) { 2189 Thread* self = Thread::Current(); 2190 StackHandleScope<3> hs(self); 2191 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2192 bool should_allocate = false; 2193 2194 // Load the class from the dex file. 2195 if (UNLIKELY(!init_done_)) { 2196 // finish up init of hand crafted class_roots_ 2197 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2198 klass.Assign(GetClassRoot(kJavaLangObject)); 2199 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2200 klass.Assign(GetClassRoot(kJavaLangClass)); 2201 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2202 klass.Assign(GetClassRoot(kJavaLangString)); 2203 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2204 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2205 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2206 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2207 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2208 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2209 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2210 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2211 } else { 2212 should_allocate = true; 2213 } 2214 } else { 2215 should_allocate = true; 2216 } 2217 2218 if (should_allocate) { 2219 // Allocate a class with the status of not ready. 2220 // Interface object should get the right size here. Regular class will 2221 // figure out the right size later and be replaced with one of the right 2222 // size when the class becomes resolved. 2223 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2224 } 2225 if (UNLIKELY(klass.Get() == nullptr)) { 2226 CHECK(self->IsExceptionPending()); // Expect an OOME. 2227 return nullptr; 2228 } 2229 klass->SetDexCache(FindDexCache(dex_file)); 2230 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2231 ObjectLock<mirror::Class> lock(self, klass); 2232 if (self->IsExceptionPending()) { 2233 // An exception occured during load, set status to erroneous while holding klass' lock in case 2234 // notification is necessary. 2235 if (!klass->IsErroneous()) { 2236 klass->SetStatus(mirror::Class::kStatusError, self); 2237 } 2238 return nullptr; 2239 } 2240 klass->SetClinitThreadId(self->GetTid()); 2241 2242 // Add the newly loaded class to the loaded classes table. 2243 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2244 if (existing != nullptr) { 2245 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2246 // this thread to block. 2247 return EnsureResolved(self, descriptor, existing); 2248 } 2249 2250 // Finish loading (if necessary) by finding parents 2251 CHECK(!klass->IsLoaded()); 2252 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2253 // Loading failed. 2254 if (!klass->IsErroneous()) { 2255 klass->SetStatus(mirror::Class::kStatusError, self); 2256 } 2257 return nullptr; 2258 } 2259 CHECK(klass->IsLoaded()); 2260 // Link the class (if necessary) 2261 CHECK(!klass->IsResolved()); 2262 // TODO: Use fast jobjects? 2263 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2264 2265 mirror::Class* new_class = nullptr; 2266 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2267 // Linking failed. 2268 if (!klass->IsErroneous()) { 2269 klass->SetStatus(mirror::Class::kStatusError, self); 2270 } 2271 return nullptr; 2272 } 2273 self->AssertNoPendingException(); 2274 CHECK(new_class != nullptr) << descriptor; 2275 CHECK(new_class->IsResolved()) << descriptor; 2276 2277 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2278 2279 /* 2280 * We send CLASS_PREPARE events to the debugger from here. The 2281 * definition of "preparation" is creating the static fields for a 2282 * class and initializing them to the standard default values, but not 2283 * executing any code (that comes later, during "initialization"). 2284 * 2285 * We did the static preparation in LinkClass. 2286 * 2287 * The class has been prepared and resolved but possibly not yet verified 2288 * at this point. 2289 */ 2290 Dbg::PostClassPrepare(new_class_h.Get()); 2291 2292 return new_class_h.Get(); 2293} 2294 2295uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2296 const DexFile::ClassDef& dex_class_def) { 2297 const byte* class_data = dex_file.GetClassData(dex_class_def); 2298 size_t num_ref = 0; 2299 size_t num_32 = 0; 2300 size_t num_64 = 0; 2301 if (class_data != NULL) { 2302 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2303 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2304 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2305 char c = descriptor[0]; 2306 if (c == 'L' || c == '[') { 2307 num_ref++; 2308 } else if (c == 'J' || c == 'D') { 2309 num_64++; 2310 } else { 2311 num_32++; 2312 } 2313 } 2314 } 2315 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2316} 2317 2318bool ClassLinker::FindOatClass(const DexFile& dex_file, 2319 uint16_t class_def_idx, 2320 OatFile::OatClass* oat_class) { 2321 DCHECK(oat_class != nullptr); 2322 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2323 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2324 if (oat_dex_file == nullptr) { 2325 return false; 2326 } 2327 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2328 return true; 2329} 2330 2331static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2332 uint32_t method_idx) { 2333 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2334 const byte* class_data = dex_file.GetClassData(class_def); 2335 CHECK(class_data != NULL); 2336 ClassDataItemIterator it(dex_file, class_data); 2337 // Skip fields 2338 while (it.HasNextStaticField()) { 2339 it.Next(); 2340 } 2341 while (it.HasNextInstanceField()) { 2342 it.Next(); 2343 } 2344 // Process methods 2345 size_t class_def_method_index = 0; 2346 while (it.HasNextDirectMethod()) { 2347 if (it.GetMemberIndex() == method_idx) { 2348 return class_def_method_index; 2349 } 2350 class_def_method_index++; 2351 it.Next(); 2352 } 2353 while (it.HasNextVirtualMethod()) { 2354 if (it.GetMemberIndex() == method_idx) { 2355 return class_def_method_index; 2356 } 2357 class_def_method_index++; 2358 it.Next(); 2359 } 2360 DCHECK(!it.HasNext()); 2361 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2362 return 0; 2363} 2364 2365bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2366 DCHECK(oat_method != nullptr); 2367 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2368 // method for direct methods (or virtual methods made direct). 2369 mirror::Class* declaring_class = method->GetDeclaringClass(); 2370 size_t oat_method_index; 2371 if (method->IsStatic() || method->IsDirect()) { 2372 // Simple case where the oat method index was stashed at load time. 2373 oat_method_index = method->GetMethodIndex(); 2374 } else { 2375 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2376 // by search for its position in the declared virtual methods. 2377 oat_method_index = declaring_class->NumDirectMethods(); 2378 size_t end = declaring_class->NumVirtualMethods(); 2379 bool found = false; 2380 for (size_t i = 0; i < end; i++) { 2381 // Check method index instead of identity in case of duplicate method definitions. 2382 if (method->GetDexMethodIndex() == 2383 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2384 found = true; 2385 break; 2386 } 2387 oat_method_index++; 2388 } 2389 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2390 } 2391 DCHECK_EQ(oat_method_index, 2392 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2393 method->GetDeclaringClass()->GetDexClassDefIndex(), 2394 method->GetDexMethodIndex())); 2395 OatFile::OatClass oat_class; 2396 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2397 declaring_class->GetDexClassDefIndex(), 2398 &oat_class)) { 2399 return false; 2400 } 2401 2402 *oat_method = oat_class.GetOatMethod(oat_method_index); 2403 return true; 2404} 2405 2406// Special case to get oat code without overwriting a trampoline. 2407const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2408 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2409 if (method->IsProxyMethod()) { 2410 return GetQuickProxyInvokeHandler(); 2411 } 2412 OatFile::OatMethod oat_method; 2413 const void* result = nullptr; 2414 if (FindOatMethodFor(method, &oat_method)) { 2415 result = oat_method.GetQuickCode(); 2416 } 2417 2418 if (result == nullptr) { 2419 if (method->IsNative()) { 2420 // No code and native? Use generic trampoline. 2421 result = GetQuickGenericJniTrampoline(); 2422 } else if (method->IsPortableCompiled()) { 2423 // No code? Do we expect portable code? 2424 result = GetQuickToPortableBridge(); 2425 } else { 2426 // No code? You must mean to go into the interpreter. 2427 result = GetQuickToInterpreterBridge(); 2428 } 2429 } 2430 return result; 2431} 2432 2433const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2434 bool* have_portable_code) { 2435 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2436 *have_portable_code = false; 2437 if (method->IsProxyMethod()) { 2438 return GetPortableProxyInvokeHandler(); 2439 } 2440 OatFile::OatMethod oat_method; 2441 const void* result = nullptr; 2442 const void* quick_code = nullptr; 2443 if (FindOatMethodFor(method, &oat_method)) { 2444 result = oat_method.GetPortableCode(); 2445 quick_code = oat_method.GetQuickCode(); 2446 } 2447 2448 if (result == nullptr) { 2449 if (quick_code == nullptr) { 2450 // No code? You must mean to go into the interpreter. 2451 result = GetPortableToInterpreterBridge(); 2452 } else { 2453 // No code? But there's quick code, so use a bridge. 2454 result = GetPortableToQuickBridge(); 2455 } 2456 } else { 2457 *have_portable_code = true; 2458 } 2459 return result; 2460} 2461 2462const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2463 uint32_t method_idx) { 2464 OatFile::OatClass oat_class; 2465 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2466 return nullptr; 2467 } 2468 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2469 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2470} 2471 2472const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2473 uint32_t method_idx) { 2474 OatFile::OatClass oat_class; 2475 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2476 return nullptr; 2477 } 2478 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2479 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2480} 2481 2482// Returns true if the method must run with interpreter, false otherwise. 2483static bool NeedsInterpreter( 2484 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2485 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2486 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2487 // No code: need interpreter. 2488 // May return true for native code, in the case of generic JNI 2489 // DCHECK(!method->IsNative()); 2490 return true; 2491 } 2492#ifdef ART_SEA_IR_MODE 2493 ScopedObjectAccess soa(Thread::Current()); 2494 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2495 LOG(INFO) << "Found " << PrettyMethod(method); 2496 return false; 2497 } 2498#endif 2499 // If interpreter mode is enabled, every method (except native and proxy) must 2500 // be run with interpreter. 2501 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2502 !method->IsNative() && !method->IsProxyMethod(); 2503} 2504 2505void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2506 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2507 if (klass->NumDirectMethods() == 0) { 2508 return; // No direct methods => no static methods. 2509 } 2510 Runtime* runtime = Runtime::Current(); 2511 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2512 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2513 return; // OAT file unavailable. 2514 } 2515 } 2516 2517 const DexFile& dex_file = klass->GetDexFile(); 2518 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2519 CHECK(dex_class_def != nullptr); 2520 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2521 // There should always be class data if there were direct methods. 2522 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2523 ClassDataItemIterator it(dex_file, class_data); 2524 // Skip fields 2525 while (it.HasNextStaticField()) { 2526 it.Next(); 2527 } 2528 while (it.HasNextInstanceField()) { 2529 it.Next(); 2530 } 2531 OatFile::OatClass oat_class; 2532 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2533 // Link the code of methods skipped by LinkCode. 2534 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2535 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2536 if (!method->IsStatic()) { 2537 // Only update static methods. 2538 continue; 2539 } 2540 const void* portable_code = nullptr; 2541 const void* quick_code = nullptr; 2542 if (has_oat_class) { 2543 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2544 portable_code = oat_method.GetPortableCode(); 2545 quick_code = oat_method.GetQuickCode(); 2546 } 2547 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2548 bool have_portable_code = false; 2549 if (enter_interpreter) { 2550 // Use interpreter entry point. 2551 // Check whether the method is native, in which case it's generic JNI. 2552 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2553 quick_code = GetQuickGenericJniTrampoline(); 2554 portable_code = GetPortableToQuickBridge(); 2555 } else { 2556 portable_code = GetPortableToInterpreterBridge(); 2557 quick_code = GetQuickToInterpreterBridge(); 2558 } 2559 } else { 2560 if (portable_code == nullptr) { 2561 portable_code = GetPortableToQuickBridge(); 2562 } else { 2563 have_portable_code = true; 2564 } 2565 if (quick_code == nullptr) { 2566 quick_code = GetQuickToPortableBridge(); 2567 } 2568 } 2569 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2570 have_portable_code); 2571 } 2572 // Ignore virtual methods on the iterator. 2573} 2574 2575void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2576 const DexFile& dex_file, uint32_t dex_method_index, 2577 uint32_t method_index) { 2578 if (Runtime::Current()->IsCompiler()) { 2579 // The following code only applies to a non-compiler runtime. 2580 return; 2581 } 2582 // Method shouldn't have already been linked. 2583 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2584 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2585 if (oat_class != nullptr) { 2586 // Every kind of method should at least get an invoke stub from the oat_method. 2587 // non-abstract methods also get their code pointers. 2588 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2589 oat_method.LinkMethod(method.Get()); 2590 } 2591 2592 // Install entry point from interpreter. 2593 bool enter_interpreter = NeedsInterpreter(method.Get(), 2594 method->GetEntryPointFromQuickCompiledCode(), 2595 method->GetEntryPointFromPortableCompiledCode()); 2596 if (enter_interpreter && !method->IsNative()) { 2597 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2598 } else { 2599 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2600 } 2601 2602 if (method->IsAbstract()) { 2603 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2604 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2605 return; 2606 } 2607 2608 bool have_portable_code = false; 2609 if (method->IsStatic() && !method->IsConstructor()) { 2610 // For static methods excluding the class initializer, install the trampoline. 2611 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2612 // after initializing class (see ClassLinker::InitializeClass method). 2613 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2614 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2615 } else if (enter_interpreter) { 2616 if (!method->IsNative()) { 2617 // Set entry point from compiled code if there's no code or in interpreter only mode. 2618 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2619 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2620 } else { 2621 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2622 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2623 } 2624 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2625 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2626 have_portable_code = true; 2627 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2628 } else { 2629 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2630 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2631 } 2632 2633 if (method->IsNative()) { 2634 // Unregistering restores the dlsym lookup stub. 2635 method->UnregisterNative(Thread::Current()); 2636 2637 if (enter_interpreter) { 2638 // We have a native method here without code. Then it should have either the GenericJni 2639 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2640 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2641 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2642 } 2643 } 2644 2645 // Allow instrumentation its chance to hijack code. 2646 Runtime* runtime = Runtime::Current(); 2647 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2648 method->GetEntryPointFromQuickCompiledCode(), 2649 method->GetEntryPointFromPortableCompiledCode(), 2650 have_portable_code); 2651} 2652 2653void ClassLinker::LoadClass(const DexFile& dex_file, 2654 const DexFile::ClassDef& dex_class_def, 2655 Handle<mirror::Class> klass, 2656 mirror::ClassLoader* class_loader) { 2657 CHECK(klass.Get() != NULL); 2658 CHECK(klass->GetDexCache() != NULL); 2659 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2660 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2661 CHECK(descriptor != NULL); 2662 2663 klass->SetClass(GetClassRoot(kJavaLangClass)); 2664 if (kUseBakerOrBrooksReadBarrier) { 2665 klass->AssertReadBarrierPointer(); 2666 } 2667 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2668 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2669 klass->SetAccessFlags(access_flags); 2670 klass->SetClassLoader(class_loader); 2671 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2672 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2673 2674 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2675 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2676 2677 const byte* class_data = dex_file.GetClassData(dex_class_def); 2678 if (class_data == NULL) { 2679 return; // no fields or methods - for example a marker interface 2680 } 2681 2682 OatFile::OatClass oat_class; 2683 if (Runtime::Current()->IsStarted() 2684 && !Runtime::Current()->UseCompileTimeClassPath() 2685 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2686 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2687 } else { 2688 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2689 } 2690} 2691 2692void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2693 const byte* class_data, 2694 Handle<mirror::Class> klass, 2695 mirror::ClassLoader* class_loader, 2696 const OatFile::OatClass* oat_class) { 2697 // Load fields. 2698 ClassDataItemIterator it(dex_file, class_data); 2699 Thread* self = Thread::Current(); 2700 if (it.NumStaticFields() != 0) { 2701 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2702 if (UNLIKELY(statics == NULL)) { 2703 CHECK(self->IsExceptionPending()); // OOME. 2704 return; 2705 } 2706 klass->SetSFields(statics); 2707 } 2708 if (it.NumInstanceFields() != 0) { 2709 mirror::ObjectArray<mirror::ArtField>* fields = 2710 AllocArtFieldArray(self, it.NumInstanceFields()); 2711 if (UNLIKELY(fields == NULL)) { 2712 CHECK(self->IsExceptionPending()); // OOME. 2713 return; 2714 } 2715 klass->SetIFields(fields); 2716 } 2717 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2718 StackHandleScope<1> hs(self); 2719 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2720 if (UNLIKELY(sfield.Get() == NULL)) { 2721 CHECK(self->IsExceptionPending()); // OOME. 2722 return; 2723 } 2724 klass->SetStaticField(i, sfield.Get()); 2725 LoadField(dex_file, it, klass, sfield); 2726 } 2727 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2728 StackHandleScope<1> hs(self); 2729 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2730 if (UNLIKELY(ifield.Get() == NULL)) { 2731 CHECK(self->IsExceptionPending()); // OOME. 2732 return; 2733 } 2734 klass->SetInstanceField(i, ifield.Get()); 2735 LoadField(dex_file, it, klass, ifield); 2736 } 2737 2738 // Load methods. 2739 if (it.NumDirectMethods() != 0) { 2740 // TODO: append direct methods to class object 2741 mirror::ObjectArray<mirror::ArtMethod>* directs = 2742 AllocArtMethodArray(self, it.NumDirectMethods()); 2743 if (UNLIKELY(directs == NULL)) { 2744 CHECK(self->IsExceptionPending()); // OOME. 2745 return; 2746 } 2747 klass->SetDirectMethods(directs); 2748 } 2749 if (it.NumVirtualMethods() != 0) { 2750 // TODO: append direct methods to class object 2751 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2752 AllocArtMethodArray(self, it.NumVirtualMethods()); 2753 if (UNLIKELY(virtuals == NULL)) { 2754 CHECK(self->IsExceptionPending()); // OOME. 2755 return; 2756 } 2757 klass->SetVirtualMethods(virtuals); 2758 } 2759 size_t class_def_method_index = 0; 2760 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2761 size_t last_class_def_method_index = 0; 2762 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2763 StackHandleScope<1> hs(self); 2764 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2765 if (UNLIKELY(method.Get() == NULL)) { 2766 CHECK(self->IsExceptionPending()); // OOME. 2767 return; 2768 } 2769 klass->SetDirectMethod(i, method.Get()); 2770 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2771 uint32_t it_method_index = it.GetMemberIndex(); 2772 if (last_dex_method_index == it_method_index) { 2773 // duplicate case 2774 method->SetMethodIndex(last_class_def_method_index); 2775 } else { 2776 method->SetMethodIndex(class_def_method_index); 2777 last_dex_method_index = it_method_index; 2778 last_class_def_method_index = class_def_method_index; 2779 } 2780 class_def_method_index++; 2781 } 2782 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2783 StackHandleScope<1> hs(self); 2784 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2785 if (UNLIKELY(method.Get() == NULL)) { 2786 CHECK(self->IsExceptionPending()); // OOME. 2787 return; 2788 } 2789 klass->SetVirtualMethod(i, method.Get()); 2790 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2791 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2792 class_def_method_index++; 2793 } 2794 DCHECK(!it.HasNext()); 2795} 2796 2797void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2798 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2799 uint32_t field_idx = it.GetMemberIndex(); 2800 dst->SetDexFieldIndex(field_idx); 2801 dst->SetDeclaringClass(klass.Get()); 2802 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2803} 2804 2805mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2806 const ClassDataItemIterator& it, 2807 Handle<mirror::Class> klass) { 2808 uint32_t dex_method_idx = it.GetMemberIndex(); 2809 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2810 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2811 2812 mirror::ArtMethod* dst = AllocArtMethod(self); 2813 if (UNLIKELY(dst == NULL)) { 2814 CHECK(self->IsExceptionPending()); // OOME. 2815 return NULL; 2816 } 2817 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2818 2819 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2820 dst->SetDexMethodIndex(dex_method_idx); 2821 dst->SetDeclaringClass(klass.Get()); 2822 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2823 2824 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2825 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2826 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2827 2828 uint32_t access_flags = it.GetMethodAccessFlags(); 2829 2830 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2831 // Set finalizable flag on declaring class. 2832 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2833 // Void return type. 2834 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2835 klass->SetFinalizable(); 2836 } else { 2837 std::string temp; 2838 const char* klass_descriptor = klass->GetDescriptor(&temp); 2839 // The Enum class declares a "final" finalize() method to prevent subclasses from 2840 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2841 // subclasses, so we exclude it here. 2842 // We also want to avoid setting the flag on Object, where we know that finalize() is 2843 // empty. 2844 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2845 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2846 klass->SetFinalizable(); 2847 } 2848 } 2849 } 2850 } else if (method_name[0] == '<') { 2851 // Fix broken access flags for initializers. Bug 11157540. 2852 bool is_init = (strcmp("<init>", method_name) == 0); 2853 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2854 if (UNLIKELY(!is_init && !is_clinit)) { 2855 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2856 } else { 2857 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2858 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2859 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2860 access_flags |= kAccConstructor; 2861 } 2862 } 2863 } 2864 dst->SetAccessFlags(access_flags); 2865 2866 self->EndAssertNoThreadSuspension(old_cause); 2867 return dst; 2868} 2869 2870void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2871 Thread* self = Thread::Current(); 2872 StackHandleScope<1> hs(self); 2873 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2874 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2875 AppendToBootClassPath(dex_file, dex_cache); 2876} 2877 2878void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2879 Handle<mirror::DexCache> dex_cache) { 2880 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2881 boot_class_path_.push_back(&dex_file); 2882 RegisterDexFile(dex_file, dex_cache); 2883} 2884 2885bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2886 dex_lock_.AssertSharedHeld(Thread::Current()); 2887 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2888 mirror::DexCache* dex_cache = GetDexCache(i); 2889 if (dex_cache->GetDexFile() == &dex_file) { 2890 return true; 2891 } 2892 } 2893 return false; 2894} 2895 2896bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2897 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2898 return IsDexFileRegisteredLocked(dex_file); 2899} 2900 2901void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2902 Handle<mirror::DexCache> dex_cache) { 2903 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2904 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2905 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2906 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2907 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2908 dex_cache->SetDexFile(&dex_file); 2909 if (log_new_dex_caches_roots_) { 2910 // TODO: This is not safe if we can remove dex caches. 2911 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2912 } 2913} 2914 2915void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2916 Thread* self = Thread::Current(); 2917 { 2918 ReaderMutexLock mu(self, dex_lock_); 2919 if (IsDexFileRegisteredLocked(dex_file)) { 2920 return; 2921 } 2922 } 2923 // Don't alloc while holding the lock, since allocation may need to 2924 // suspend all threads and another thread may need the dex_lock_ to 2925 // get to a suspend point. 2926 StackHandleScope<1> hs(self); 2927 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2928 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2929 { 2930 WriterMutexLock mu(self, dex_lock_); 2931 if (IsDexFileRegisteredLocked(dex_file)) { 2932 return; 2933 } 2934 RegisterDexFileLocked(dex_file, dex_cache); 2935 } 2936} 2937 2938void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2939 Handle<mirror::DexCache> dex_cache) { 2940 WriterMutexLock mu(Thread::Current(), dex_lock_); 2941 RegisterDexFileLocked(dex_file, dex_cache); 2942} 2943 2944mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2945 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2946 // Search assuming unique-ness of dex file. 2947 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2948 mirror::DexCache* dex_cache = GetDexCache(i); 2949 if (dex_cache->GetDexFile() == &dex_file) { 2950 return dex_cache; 2951 } 2952 } 2953 // Search matching by location name. 2954 std::string location(dex_file.GetLocation()); 2955 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2956 mirror::DexCache* dex_cache = GetDexCache(i); 2957 if (dex_cache->GetDexFile()->GetLocation() == location) { 2958 return dex_cache; 2959 } 2960 } 2961 // Failure, dump diagnostic and abort. 2962 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2963 mirror::DexCache* dex_cache = GetDexCache(i); 2964 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2965 } 2966 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2967 return NULL; 2968} 2969 2970void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2971 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2972 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2973 mirror::DexCache* dex_cache = GetDexCache(i); 2974 dex_cache->Fixup(resolution_method); 2975 } 2976} 2977 2978mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2979 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2980 if (UNLIKELY(klass == NULL)) { 2981 return NULL; 2982 } 2983 return InitializePrimitiveClass(klass, type); 2984} 2985 2986mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2987 Primitive::Type type) { 2988 CHECK(primitive_class != NULL); 2989 // Must hold lock on object when initializing. 2990 Thread* self = Thread::Current(); 2991 StackHandleScope<1> hs(self); 2992 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2993 ObjectLock<mirror::Class> lock(self, h_class); 2994 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2995 primitive_class->SetPrimitiveType(type); 2996 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2997 const char* descriptor = Primitive::Descriptor(type); 2998 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2999 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 3000 return primitive_class; 3001} 3002 3003// Create an array class (i.e. the class object for the array, not the 3004// array itself). "descriptor" looks like "[C" or "[[[[B" or 3005// "[Ljava/lang/String;". 3006// 3007// If "descriptor" refers to an array of primitives, look up the 3008// primitive type's internally-generated class object. 3009// 3010// "class_loader" is the class loader of the class that's referring to 3011// us. It's used to ensure that we're looking for the element type in 3012// the right context. It does NOT become the class loader for the 3013// array class; that always comes from the base element class. 3014// 3015// Returns NULL with an exception raised on failure. 3016mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3017 Handle<mirror::ClassLoader> class_loader) { 3018 // Identify the underlying component type 3019 CHECK_EQ('[', descriptor[0]); 3020 StackHandleScope<2> hs(self); 3021 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3022 if (component_type.Get() == nullptr) { 3023 DCHECK(self->IsExceptionPending()); 3024 // We need to accept erroneous classes as component types. 3025 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 3026 if (component_type.Get() == nullptr) { 3027 DCHECK(self->IsExceptionPending()); 3028 return nullptr; 3029 } else { 3030 self->ClearException(); 3031 } 3032 } 3033 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3034 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3035 return nullptr; 3036 } 3037 // See if the component type is already loaded. Array classes are 3038 // always associated with the class loader of their underlying 3039 // element type -- an array of Strings goes with the loader for 3040 // java/lang/String -- so we need to look for it there. (The 3041 // caller should have checked for the existence of the class 3042 // before calling here, but they did so with *their* class loader, 3043 // not the component type's loader.) 3044 // 3045 // If we find it, the caller adds "loader" to the class' initiating 3046 // loader list, which should prevent us from going through this again. 3047 // 3048 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3049 // are the same, because our caller (FindClass) just did the 3050 // lookup. (Even if we get this wrong we still have correct behavior, 3051 // because we effectively do this lookup again when we add the new 3052 // class to the hash table --- necessary because of possible races with 3053 // other threads.) 3054 if (class_loader.Get() != component_type->GetClassLoader()) { 3055 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 3056 if (new_class != NULL) { 3057 return new_class; 3058 } 3059 } 3060 3061 // Fill out the fields in the Class. 3062 // 3063 // It is possible to execute some methods against arrays, because 3064 // all arrays are subclasses of java_lang_Object_, so we need to set 3065 // up a vtable. We can just point at the one in java_lang_Object_. 3066 // 3067 // Array classes are simple enough that we don't need to do a full 3068 // link step. 3069 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3070 if (UNLIKELY(!init_done_)) { 3071 // Classes that were hand created, ie not by FindSystemClass 3072 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3073 new_class.Assign(GetClassRoot(kClassArrayClass)); 3074 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3075 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3076 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3077 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3078 } else if (strcmp(descriptor, 3079 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3080 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3081 } else if (strcmp(descriptor, 3082 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3083 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3084 } else if (strcmp(descriptor, "[C") == 0) { 3085 new_class.Assign(GetClassRoot(kCharArrayClass)); 3086 } else if (strcmp(descriptor, "[I") == 0) { 3087 new_class.Assign(GetClassRoot(kIntArrayClass)); 3088 } 3089 } 3090 if (new_class.Get() == nullptr) { 3091 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3092 if (new_class.Get() == nullptr) { 3093 return nullptr; 3094 } 3095 new_class->SetComponentType(component_type.Get()); 3096 } 3097 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3098 DCHECK(new_class->GetComponentType() != NULL); 3099 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3100 new_class->SetSuperClass(java_lang_Object); 3101 new_class->SetVTable(java_lang_Object->GetVTable()); 3102 new_class->SetPrimitiveType(Primitive::kPrimNot); 3103 new_class->SetClassLoader(component_type->GetClassLoader()); 3104 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3105 new_class->PopulateEmbeddedImtAndVTable(); 3106 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3107 // don't need to set new_class->SetObjectSize(..) 3108 // because Object::SizeOf delegates to Array::SizeOf 3109 3110 3111 // All arrays have java/lang/Cloneable and java/io/Serializable as 3112 // interfaces. We need to set that up here, so that stuff like 3113 // "instanceof" works right. 3114 // 3115 // Note: The GC could run during the call to FindSystemClass, 3116 // so we need to make sure the class object is GC-valid while we're in 3117 // there. Do this by clearing the interface list so the GC will just 3118 // think that the entries are null. 3119 3120 3121 // Use the single, global copies of "interfaces" and "iftable" 3122 // (remember not to free them for arrays). 3123 { 3124 mirror::IfTable* array_iftable = array_iftable_.Read(); 3125 CHECK(array_iftable != nullptr); 3126 new_class->SetIfTable(array_iftable); 3127 } 3128 3129 // Inherit access flags from the component type. 3130 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3131 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3132 access_flags &= kAccJavaFlagsMask; 3133 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3134 // and remove "interface". 3135 access_flags |= kAccAbstract | kAccFinal; 3136 access_flags &= ~kAccInterface; 3137 3138 new_class->SetAccessFlags(access_flags); 3139 3140 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3141 if (existing == nullptr) { 3142 return new_class.Get(); 3143 } 3144 // Another thread must have loaded the class after we 3145 // started but before we finished. Abandon what we've 3146 // done. 3147 // 3148 // (Yes, this happens.) 3149 3150 return existing; 3151} 3152 3153mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3154 switch (type) { 3155 case 'B': 3156 return GetClassRoot(kPrimitiveByte); 3157 case 'C': 3158 return GetClassRoot(kPrimitiveChar); 3159 case 'D': 3160 return GetClassRoot(kPrimitiveDouble); 3161 case 'F': 3162 return GetClassRoot(kPrimitiveFloat); 3163 case 'I': 3164 return GetClassRoot(kPrimitiveInt); 3165 case 'J': 3166 return GetClassRoot(kPrimitiveLong); 3167 case 'S': 3168 return GetClassRoot(kPrimitiveShort); 3169 case 'Z': 3170 return GetClassRoot(kPrimitiveBoolean); 3171 case 'V': 3172 return GetClassRoot(kPrimitiveVoid); 3173 default: 3174 break; 3175 } 3176 std::string printable_type(PrintableChar(type)); 3177 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3178 return NULL; 3179} 3180 3181mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3182 size_t hash) { 3183 if (VLOG_IS_ON(class_linker)) { 3184 mirror::DexCache* dex_cache = klass->GetDexCache(); 3185 std::string source; 3186 if (dex_cache != NULL) { 3187 source += " from "; 3188 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3189 } 3190 LOG(INFO) << "Loaded class " << descriptor << source; 3191 } 3192 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3193 mirror::Class* existing = 3194 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3195 if (existing != NULL) { 3196 return existing; 3197 } 3198 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3199 dex_cache_image_class_lookup_required_) { 3200 // Check a class loaded with the system class loader matches one in the image if the class 3201 // is in the image. 3202 existing = LookupClassFromImage(descriptor); 3203 if (existing != NULL) { 3204 CHECK(klass == existing); 3205 } 3206 } 3207 VerifyObject(klass); 3208 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3209 if (log_new_class_table_roots_) { 3210 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3211 } 3212 return NULL; 3213} 3214 3215mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3216 size_t hash) { 3217 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3218 mirror::Class* existing = 3219 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3220 3221 if (existing == nullptr) { 3222 CHECK(klass->IsProxyClass()); 3223 return nullptr; 3224 } 3225 3226 CHECK_NE(existing, klass) << descriptor; 3227 CHECK(!existing->IsResolved()) << descriptor; 3228 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3229 3230 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3231 ++it) { 3232 mirror::Class* klass = it->second.Read(); 3233 if (klass == existing) { 3234 class_table_.erase(it); 3235 break; 3236 } 3237 } 3238 3239 CHECK(!klass->IsTemp()) << descriptor; 3240 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3241 dex_cache_image_class_lookup_required_) { 3242 // Check a class loaded with the system class loader matches one in the image if the class 3243 // is in the image. 3244 existing = LookupClassFromImage(descriptor); 3245 if (existing != nullptr) { 3246 CHECK(klass == existing) << descriptor; 3247 } 3248 } 3249 VerifyObject(klass); 3250 3251 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3252 if (log_new_class_table_roots_) { 3253 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3254 } 3255 3256 return existing; 3257} 3258 3259bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3260 size_t hash = Hash(descriptor); 3261 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3262 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3263 it != end && it->first == hash; 3264 ++it) { 3265 mirror::Class* klass = it->second.Read(); 3266 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3267 class_table_.erase(it); 3268 return true; 3269 } 3270 } 3271 return false; 3272} 3273 3274mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3275 const mirror::ClassLoader* class_loader) { 3276 size_t hash = Hash(descriptor); 3277 { 3278 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3279 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3280 if (result != NULL) { 3281 return result; 3282 } 3283 } 3284 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3285 return NULL; 3286 } else { 3287 // Lookup failed but need to search dex_caches_. 3288 mirror::Class* result = LookupClassFromImage(descriptor); 3289 if (result != NULL) { 3290 InsertClass(descriptor, result, hash); 3291 } else { 3292 // Searching the image dex files/caches failed, we don't want to get into this situation 3293 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3294 // classes into the class table. 3295 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3296 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3297 MoveImageClassesToClassTable(); 3298 } 3299 } 3300 return result; 3301 } 3302} 3303 3304mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3305 const mirror::ClassLoader* class_loader, 3306 size_t hash) { 3307 auto end = class_table_.end(); 3308 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3309 mirror::Class* klass = it->second.Read(); 3310 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3311 if (kIsDebugBuild) { 3312 // Check for duplicates in the table. 3313 for (++it; it != end && it->first == hash; ++it) { 3314 mirror::Class* klass2 = it->second.Read(); 3315 CHECK(!(klass2->GetClassLoader() == class_loader && 3316 klass2->DescriptorEquals(descriptor))) 3317 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3318 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3319 } 3320 } 3321 return klass; 3322 } 3323 } 3324 return NULL; 3325} 3326 3327static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3328 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3329 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3330 CHECK(image != NULL); 3331 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3332 return root->AsObjectArray<mirror::DexCache>(); 3333} 3334 3335void ClassLinker::MoveImageClassesToClassTable() { 3336 Thread* self = Thread::Current(); 3337 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3338 if (!dex_cache_image_class_lookup_required_) { 3339 return; // All dex cache classes are already in the class table. 3340 } 3341 const char* old_no_suspend_cause = 3342 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3343 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3344 std::string temp; 3345 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3346 mirror::DexCache* dex_cache = dex_caches->Get(i); 3347 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3348 for (int32_t j = 0; j < types->GetLength(); j++) { 3349 mirror::Class* klass = types->Get(j); 3350 if (klass != NULL) { 3351 DCHECK(klass->GetClassLoader() == NULL); 3352 const char* descriptor = klass->GetDescriptor(&temp); 3353 size_t hash = Hash(descriptor); 3354 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3355 if (existing != NULL) { 3356 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3357 << PrettyClassAndClassLoader(klass); 3358 } else { 3359 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3360 if (log_new_class_table_roots_) { 3361 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3362 } 3363 } 3364 } 3365 } 3366 } 3367 dex_cache_image_class_lookup_required_ = false; 3368 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3369} 3370 3371mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3372 Thread* self = Thread::Current(); 3373 const char* old_no_suspend_cause = 3374 self->StartAssertNoThreadSuspension("Image class lookup"); 3375 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3376 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3377 mirror::DexCache* dex_cache = dex_caches->Get(i); 3378 const DexFile* dex_file = dex_cache->GetDexFile(); 3379 // Try binary searching the string/type index. 3380 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3381 if (string_id != NULL) { 3382 const DexFile::TypeId* type_id = 3383 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3384 if (type_id != NULL) { 3385 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3386 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3387 if (klass != NULL) { 3388 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3389 return klass; 3390 } 3391 } 3392 } 3393 } 3394 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3395 return NULL; 3396} 3397 3398void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3399 result.clear(); 3400 if (dex_cache_image_class_lookup_required_) { 3401 MoveImageClassesToClassTable(); 3402 } 3403 size_t hash = Hash(descriptor); 3404 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3405 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3406 it != end && it->first == hash; ++it) { 3407 mirror::Class* klass = it->second.Read(); 3408 if (klass->DescriptorEquals(descriptor)) { 3409 result.push_back(klass); 3410 } 3411 } 3412} 3413 3414void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3415 // TODO: assert that the monitor on the Class is held 3416 Thread* self = Thread::Current(); 3417 ObjectLock<mirror::Class> lock(self, klass); 3418 3419 // Don't attempt to re-verify if already sufficiently verified. 3420 if (klass->IsVerified()) { 3421 EnsurePreverifiedMethods(klass); 3422 return; 3423 } 3424 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3425 return; 3426 } 3427 3428 // The class might already be erroneous, for example at compile time if we attempted to verify 3429 // this class as a parent to another. 3430 if (klass->IsErroneous()) { 3431 ThrowEarlierClassFailure(klass.Get()); 3432 return; 3433 } 3434 3435 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3436 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3437 } else { 3438 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3439 << PrettyClass(klass.Get()); 3440 CHECK(!Runtime::Current()->IsCompiler()); 3441 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3442 } 3443 3444 // Skip verification if disabled. 3445 if (!Runtime::Current()->IsVerificationEnabled()) { 3446 klass->SetStatus(mirror::Class::kStatusVerified, self); 3447 EnsurePreverifiedMethods(klass); 3448 return; 3449 } 3450 3451 // Verify super class. 3452 StackHandleScope<2> hs(self); 3453 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3454 if (super.Get() != NULL) { 3455 // Acquire lock to prevent races on verifying the super class. 3456 ObjectLock<mirror::Class> lock(self, super); 3457 3458 if (!super->IsVerified() && !super->IsErroneous()) { 3459 VerifyClass(super); 3460 } 3461 if (!super->IsCompileTimeVerified()) { 3462 std::string error_msg( 3463 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3464 PrettyDescriptor(klass.Get()).c_str(), 3465 PrettyDescriptor(super.Get()).c_str())); 3466 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3467 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3468 if (cause.Get() != nullptr) { 3469 self->ClearException(); 3470 } 3471 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3472 if (cause.Get() != nullptr) { 3473 self->GetException(nullptr)->SetCause(cause.Get()); 3474 } 3475 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3476 if (Runtime::Current()->IsCompiler()) { 3477 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3478 } 3479 klass->SetStatus(mirror::Class::kStatusError, self); 3480 return; 3481 } 3482 } 3483 3484 // Try to use verification information from the oat file, otherwise do runtime verification. 3485 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3486 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3487 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3488 if (oat_file_class_status == mirror::Class::kStatusError) { 3489 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3490 << PrettyDescriptor(klass.Get()) << " in " 3491 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3492 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3493 PrettyDescriptor(klass.Get()).c_str()); 3494 klass->SetStatus(mirror::Class::kStatusError, self); 3495 return; 3496 } 3497 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3498 std::string error_msg; 3499 if (!preverified) { 3500 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3501 Runtime::Current()->IsCompiler(), 3502 &error_msg); 3503 } 3504 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3505 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3506 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3507 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3508 << " because: " << error_msg; 3509 } 3510 self->AssertNoPendingException(); 3511 // Make sure all classes referenced by catch blocks are resolved. 3512 ResolveClassExceptionHandlerTypes(dex_file, klass); 3513 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3514 // Even though there were no verifier failures we need to respect whether the super-class 3515 // was verified or requiring runtime reverification. 3516 if (super.Get() == NULL || super->IsVerified()) { 3517 klass->SetStatus(mirror::Class::kStatusVerified, self); 3518 } else { 3519 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3520 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3521 // Pretend a soft failure occured so that we don't consider the class verified below. 3522 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3523 } 3524 } else { 3525 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3526 // Soft failures at compile time should be retried at runtime. Soft 3527 // failures at runtime will be handled by slow paths in the generated 3528 // code. Set status accordingly. 3529 if (Runtime::Current()->IsCompiler()) { 3530 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3531 } else { 3532 klass->SetStatus(mirror::Class::kStatusVerified, self); 3533 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3534 // later. 3535 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3536 } 3537 } 3538 } else { 3539 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3540 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3541 << " because: " << error_msg; 3542 self->AssertNoPendingException(); 3543 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3544 klass->SetStatus(mirror::Class::kStatusError, self); 3545 } 3546 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3547 // Class is verified so we don't need to do any access check on its methods. 3548 // Let the interpreter know it by setting the kAccPreverified flag onto each 3549 // method. 3550 // Note: we're going here during compilation and at runtime. When we set the 3551 // kAccPreverified flag when compiling image classes, the flag is recorded 3552 // in the image and is set when loading the image. 3553 EnsurePreverifiedMethods(klass); 3554 } 3555} 3556 3557void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3558 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3559 klass->SetPreverifiedFlagOnAllMethods(); 3560 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3561 } 3562} 3563 3564bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3565 mirror::Class::Status& oat_file_class_status) { 3566 // If we're compiling, we can only verify the class using the oat file if 3567 // we are not compiling the image or if the class we're verifying is not part of 3568 // the app. In other words, we will only check for preverification of bootclasspath 3569 // classes. 3570 if (Runtime::Current()->IsCompiler()) { 3571 // Are we compiling the bootclasspath? 3572 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3573 return false; 3574 } 3575 // We are compiling an app (not the image). 3576 3577 // Is this an app class? (I.e. not a bootclasspath class) 3578 if (klass->GetClassLoader() != NULL) { 3579 return false; 3580 } 3581 } 3582 3583 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3584 // Make this work with gtests, which do not set up the image properly. 3585 // TODO: we should clean up gtests to set up the image path properly. 3586 if (Runtime::Current()->IsCompiler() || (oat_dex_file == nullptr)) { 3587 return false; 3588 } 3589 3590 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3591 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3592 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3593 if (oat_file_class_status == mirror::Class::kStatusVerified || 3594 oat_file_class_status == mirror::Class::kStatusInitialized) { 3595 return true; 3596 } 3597 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3598 // Compile time verification failed with a soft error. Compile time verification can fail 3599 // because we have incomplete type information. Consider the following: 3600 // class ... { 3601 // Foo x; 3602 // .... () { 3603 // if (...) { 3604 // v1 gets assigned a type of resolved class Foo 3605 // } else { 3606 // v1 gets assigned a type of unresolved class Bar 3607 // } 3608 // iput x = v1 3609 // } } 3610 // when we merge v1 following the if-the-else it results in Conflict 3611 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3612 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3613 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3614 // at compile time). 3615 return false; 3616 } 3617 if (oat_file_class_status == mirror::Class::kStatusError) { 3618 // Compile time verification failed with a hard error. This is caused by invalid instructions 3619 // in the class. These errors are unrecoverable. 3620 return false; 3621 } 3622 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3623 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3624 // not loading the class. 3625 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3626 // isn't a problem and this case shouldn't occur 3627 return false; 3628 } 3629 std::string temp; 3630 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3631 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3632 << klass->GetDescriptor(&temp); 3633 3634 return false; 3635} 3636 3637void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3638 Handle<mirror::Class> klass) { 3639 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3640 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3641 } 3642 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3643 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3644 } 3645} 3646 3647void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3648 mirror::ArtMethod* method) { 3649 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3650 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3651 if (code_item == NULL) { 3652 return; // native or abstract method 3653 } 3654 if (code_item->tries_size_ == 0) { 3655 return; // nothing to process 3656 } 3657 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3658 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3659 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3660 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3661 CatchHandlerIterator iterator(handlers_ptr); 3662 for (; iterator.HasNext(); iterator.Next()) { 3663 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3664 // unresolved exception types will be ignored by exception delivery 3665 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3666 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3667 if (exception_type == NULL) { 3668 DCHECK(Thread::Current()->IsExceptionPending()); 3669 Thread::Current()->ClearException(); 3670 } 3671 } 3672 } 3673 handlers_ptr = iterator.EndDataPointer(); 3674 } 3675} 3676 3677static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3678static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3679 Handle<mirror::ArtMethod> prototype); 3680 3681mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3682 jobjectArray interfaces, jobject loader, 3683 jobjectArray methods, jobjectArray throws) { 3684 Thread* self = soa.Self(); 3685 StackHandleScope<8> hs(self); 3686 Handle<mirror::Class> klass(hs.NewHandle( 3687 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3688 if (klass.Get() == NULL) { 3689 CHECK(self->IsExceptionPending()); // OOME. 3690 return NULL; 3691 } 3692 DCHECK(klass->GetClass() != NULL); 3693 klass->SetObjectSize(sizeof(mirror::Proxy)); 3694 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3695 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3696 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3697 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3698 klass->SetName(soa.Decode<mirror::String*>(name)); 3699 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3700 klass->SetDexCache(proxy_class->GetDexCache()); 3701 klass->SetStatus(mirror::Class::kStatusIdx, self); 3702 3703 // Instance fields are inherited, but we add a couple of static fields... 3704 { 3705 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3706 if (UNLIKELY(sfields == NULL)) { 3707 CHECK(self->IsExceptionPending()); // OOME. 3708 return NULL; 3709 } 3710 klass->SetSFields(sfields); 3711 } 3712 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3713 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3714 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3715 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3716 CHECK(self->IsExceptionPending()); // OOME. 3717 return nullptr; 3718 } 3719 klass->SetStaticField(0, interfaces_sfield.Get()); 3720 interfaces_sfield->SetDexFieldIndex(0); 3721 interfaces_sfield->SetDeclaringClass(klass.Get()); 3722 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3723 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3724 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3725 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3726 CHECK(self->IsExceptionPending()); // OOME. 3727 return nullptr; 3728 } 3729 klass->SetStaticField(1, throws_sfield.Get()); 3730 throws_sfield->SetDexFieldIndex(1); 3731 throws_sfield->SetDeclaringClass(klass.Get()); 3732 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3733 3734 // Proxies have 1 direct method, the constructor 3735 { 3736 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3737 if (UNLIKELY(directs == nullptr)) { 3738 CHECK(self->IsExceptionPending()); // OOME. 3739 return nullptr; 3740 } 3741 klass->SetDirectMethods(directs); 3742 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3743 if (UNLIKELY(constructor == nullptr)) { 3744 CHECK(self->IsExceptionPending()); // OOME. 3745 return nullptr; 3746 } 3747 klass->SetDirectMethod(0, constructor); 3748 } 3749 3750 // Create virtual method using specified prototypes. 3751 size_t num_virtual_methods = 3752 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3753 { 3754 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3755 num_virtual_methods); 3756 if (UNLIKELY(virtuals == NULL)) { 3757 CHECK(self->IsExceptionPending()); // OOME. 3758 return NULL; 3759 } 3760 klass->SetVirtualMethods(virtuals); 3761 } 3762 for (size_t i = 0; i < num_virtual_methods; ++i) { 3763 StackHandleScope<1> hs(self); 3764 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3765 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3766 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3767 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3768 if (UNLIKELY(clone == nullptr)) { 3769 CHECK(self->IsExceptionPending()); // OOME. 3770 return nullptr; 3771 } 3772 klass->SetVirtualMethod(i, clone); 3773 } 3774 3775 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3776 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3777 self->AssertNoPendingException(); 3778 3779 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3780 mirror::Class* new_class = nullptr; 3781 { 3782 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3783 // Link the fields and virtual methods, creating vtable and iftables 3784 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3785 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3786 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3787 klass->SetStatus(mirror::Class::kStatusError, self); 3788 return nullptr; 3789 } 3790 } 3791 3792 CHECK(klass->IsRetired()); 3793 CHECK_NE(klass.Get(), new_class); 3794 klass.Assign(new_class); 3795 3796 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3797 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3798 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3799 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3800 3801 { 3802 // Lock on klass is released. Lock new class object. 3803 ObjectLock<mirror::Class> initialization_lock(self, klass); 3804 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3805 } 3806 3807 // sanity checks 3808 if (kIsDebugBuild) { 3809 CHECK(klass->GetIFields() == nullptr); 3810 CheckProxyConstructor(klass->GetDirectMethod(0)); 3811 for (size_t i = 0; i < num_virtual_methods; ++i) { 3812 StackHandleScope<2> hs(self); 3813 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3814 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3815 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3816 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3817 CheckProxyMethod(virtual_method, prototype); 3818 } 3819 3820 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3821 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3822 decoded_name->ToModifiedUtf8().c_str())); 3823 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3824 3825 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3826 decoded_name->ToModifiedUtf8().c_str())); 3827 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3828 3829 CHECK_EQ(klass.Get()->GetInterfaces(), 3830 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3831 CHECK_EQ(klass.Get()->GetThrows(), 3832 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3833 } 3834 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3835 CHECK(existing == nullptr); 3836 return klass.Get(); 3837} 3838 3839std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3840 DCHECK(proxy_class->IsProxyClass()); 3841 mirror::String* name = proxy_class->GetName(); 3842 DCHECK(name != NULL); 3843 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3844} 3845 3846mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3847 mirror::ArtMethod* proxy_method) { 3848 DCHECK(proxy_class->IsProxyClass()); 3849 DCHECK(proxy_method->IsProxyMethod()); 3850 // Locate the dex cache of the original interface/Object 3851 mirror::DexCache* dex_cache = nullptr; 3852 { 3853 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3854 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3855 mirror::DexCache* a_dex_cache = GetDexCache(i); 3856 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3857 dex_cache = a_dex_cache; 3858 break; 3859 } 3860 } 3861 } 3862 CHECK(dex_cache != nullptr); 3863 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3864 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3865 CHECK(resolved_method != nullptr); 3866 return resolved_method; 3867} 3868 3869 3870mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3871 Handle<mirror::Class> klass, 3872 mirror::Class* proxy_class) { 3873 // Create constructor for Proxy that must initialize h 3874 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3875 proxy_class->GetDirectMethods(); 3876 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3877 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3878 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3879 // constructor method. 3880 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3881 proxy_constructor); 3882 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3883 // code_ too) 3884 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3885 if (constructor == nullptr) { 3886 CHECK(self->IsExceptionPending()); // OOME. 3887 return nullptr; 3888 } 3889 // Make this constructor public and fix the class to be our Proxy version 3890 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3891 constructor->SetDeclaringClass(klass.Get()); 3892 return constructor; 3893} 3894 3895static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3896 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3897 CHECK(constructor->IsConstructor()); 3898 CHECK_STREQ(constructor->GetName(), "<init>"); 3899 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3900 "(Ljava/lang/reflect/InvocationHandler;)V"); 3901 DCHECK(constructor->IsPublic()); 3902} 3903 3904mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3905 Handle<mirror::Class> klass, 3906 Handle<mirror::ArtMethod> prototype) { 3907 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3908 // prototype method 3909 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3910 prototype.Get()); 3911 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3912 // as necessary 3913 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3914 if (UNLIKELY(method == NULL)) { 3915 CHECK(self->IsExceptionPending()); // OOME. 3916 return NULL; 3917 } 3918 3919 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3920 // the intersection of throw exceptions as defined in Proxy 3921 method->SetDeclaringClass(klass.Get()); 3922 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3923 3924 // At runtime the method looks like a reference and argument saving method, clone the code 3925 // related parameters from this method. 3926 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3927 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3928 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3929 3930 return method; 3931} 3932 3933static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3934 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3935 // Basic sanity 3936 CHECK(!prototype->IsFinal()); 3937 CHECK(method->IsFinal()); 3938 CHECK(!method->IsAbstract()); 3939 3940 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3941 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3942 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3943 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3944 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3945 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3946 3947 MethodHelper mh(method); 3948 MethodHelper mh2(prototype); 3949 CHECK_STREQ(method->GetName(), prototype->GetName()); 3950 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3951 // More complex sanity - via dex cache 3952 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3953} 3954 3955static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3956 bool can_init_parents) 3957 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3958 if (can_init_statics && can_init_parents) { 3959 return true; 3960 } 3961 if (!can_init_statics) { 3962 // Check if there's a class initializer. 3963 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3964 if (clinit != NULL) { 3965 return false; 3966 } 3967 // Check if there are encoded static values needing initialization. 3968 if (klass->NumStaticFields() != 0) { 3969 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3970 DCHECK(dex_class_def != NULL); 3971 if (dex_class_def->static_values_off_ != 0) { 3972 return false; 3973 } 3974 } 3975 } 3976 if (!klass->IsInterface() && klass->HasSuperClass()) { 3977 mirror::Class* super_class = klass->GetSuperClass(); 3978 if (!can_init_parents && !super_class->IsInitialized()) { 3979 return false; 3980 } else { 3981 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3982 return false; 3983 } 3984 } 3985 } 3986 return true; 3987} 3988 3989bool ClassLinker::IsInitialized() const { 3990 return init_done_; 3991} 3992 3993bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3994 bool can_init_parents) { 3995 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3996 3997 // Are we already initialized and therefore done? 3998 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3999 // an initialized class will never change its state. 4000 if (klass->IsInitialized()) { 4001 return true; 4002 } 4003 4004 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4005 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4006 return false; 4007 } 4008 4009 Thread* self = Thread::Current(); 4010 uint64_t t0; 4011 { 4012 ObjectLock<mirror::Class> lock(self, klass); 4013 4014 // Re-check under the lock in case another thread initialized ahead of us. 4015 if (klass->IsInitialized()) { 4016 return true; 4017 } 4018 4019 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4020 if (klass->IsErroneous()) { 4021 ThrowEarlierClassFailure(klass.Get()); 4022 return false; 4023 } 4024 4025 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4026 4027 if (!klass->IsVerified()) { 4028 VerifyClass(klass); 4029 if (!klass->IsVerified()) { 4030 // We failed to verify, expect either the klass to be erroneous or verification failed at 4031 // compile time. 4032 if (klass->IsErroneous()) { 4033 CHECK(self->IsExceptionPending()); 4034 } else { 4035 CHECK(Runtime::Current()->IsCompiler()); 4036 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4037 } 4038 return false; 4039 } else { 4040 self->AssertNoPendingException(); 4041 } 4042 } 4043 4044 // If the class is kStatusInitializing, either this thread is 4045 // initializing higher up the stack or another thread has beat us 4046 // to initializing and we need to wait. Either way, this 4047 // invocation of InitializeClass will not be responsible for 4048 // running <clinit> and will return. 4049 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4050 // Could have got an exception during verification. 4051 if (self->IsExceptionPending()) { 4052 return false; 4053 } 4054 // We caught somebody else in the act; was it us? 4055 if (klass->GetClinitThreadId() == self->GetTid()) { 4056 // Yes. That's fine. Return so we can continue initializing. 4057 return true; 4058 } 4059 // No. That's fine. Wait for another thread to finish initializing. 4060 return WaitForInitializeClass(klass, self, lock); 4061 } 4062 4063 if (!ValidateSuperClassDescriptors(klass)) { 4064 klass->SetStatus(mirror::Class::kStatusError, self); 4065 return false; 4066 } 4067 4068 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4069 4070 // From here out other threads may observe that we're initializing and so changes of state 4071 // require the a notification. 4072 klass->SetClinitThreadId(self->GetTid()); 4073 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4074 4075 t0 = NanoTime(); 4076 } 4077 4078 // Initialize super classes, must be done while initializing for the JLS. 4079 if (!klass->IsInterface() && klass->HasSuperClass()) { 4080 mirror::Class* super_class = klass->GetSuperClass(); 4081 if (!super_class->IsInitialized()) { 4082 CHECK(!super_class->IsInterface()); 4083 CHECK(can_init_parents); 4084 StackHandleScope<1> hs(self); 4085 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4086 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4087 if (!super_initialized) { 4088 // The super class was verified ahead of entering initializing, we should only be here if 4089 // the super class became erroneous due to initialization. 4090 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4091 << "Super class initialization failed for " 4092 << PrettyDescriptor(handle_scope_super.Get()) 4093 << " that has unexpected status " << handle_scope_super->GetStatus() 4094 << "\nPending exception:\n" 4095 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 4096 ObjectLock<mirror::Class> lock(self, klass); 4097 // Initialization failed because the super-class is erroneous. 4098 klass->SetStatus(mirror::Class::kStatusError, self); 4099 return false; 4100 } 4101 } 4102 } 4103 4104 if (klass->NumStaticFields() > 0) { 4105 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4106 CHECK(dex_class_def != NULL); 4107 const DexFile& dex_file = klass->GetDexFile(); 4108 StackHandleScope<2> hs(self); 4109 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4110 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4111 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4112 this, *dex_class_def); 4113 if (it.HasNext()) { 4114 CHECK(can_init_statics); 4115 // We reordered the fields, so we need to be able to map the 4116 // field indexes to the right fields. 4117 SafeMap<uint32_t, mirror::ArtField*> field_map; 4118 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4119 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4120 if (Runtime::Current()->IsActiveTransaction()) { 4121 it.ReadValueToField<true>(field_map.Get(i)); 4122 } else { 4123 it.ReadValueToField<false>(field_map.Get(i)); 4124 } 4125 } 4126 } 4127 } 4128 4129 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4130 if (clinit != NULL) { 4131 CHECK(can_init_statics); 4132 JValue result; 4133 clinit->Invoke(self, NULL, 0, &result, "V"); 4134 } 4135 4136 uint64_t t1 = NanoTime(); 4137 4138 bool success = true; 4139 { 4140 ObjectLock<mirror::Class> lock(self, klass); 4141 4142 if (self->IsExceptionPending()) { 4143 WrapExceptionInInitializer(); 4144 klass->SetStatus(mirror::Class::kStatusError, self); 4145 success = false; 4146 } else { 4147 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4148 RuntimeStats* thread_stats = self->GetStats(); 4149 ++global_stats->class_init_count; 4150 ++thread_stats->class_init_count; 4151 global_stats->class_init_time_ns += (t1 - t0); 4152 thread_stats->class_init_time_ns += (t1 - t0); 4153 // Set the class as initialized except if failed to initialize static fields. 4154 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4155 if (VLOG_IS_ON(class_linker)) { 4156 std::string temp; 4157 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4158 klass->GetLocation(); 4159 } 4160 // Opportunistically set static method trampolines to their destination. 4161 FixupStaticTrampolines(klass.Get()); 4162 } 4163 } 4164 return success; 4165} 4166 4167bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4168 ObjectLock<mirror::Class>& lock) 4169 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4170 while (true) { 4171 self->AssertNoPendingException(); 4172 CHECK(!klass->IsInitialized()); 4173 lock.WaitIgnoringInterrupts(); 4174 4175 // When we wake up, repeat the test for init-in-progress. If 4176 // there's an exception pending (only possible if 4177 // "interruptShouldThrow" was set), bail out. 4178 if (self->IsExceptionPending()) { 4179 WrapExceptionInInitializer(); 4180 klass->SetStatus(mirror::Class::kStatusError, self); 4181 return false; 4182 } 4183 // Spurious wakeup? Go back to waiting. 4184 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4185 continue; 4186 } 4187 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4188 // Compile time initialization failed. 4189 return false; 4190 } 4191 if (klass->IsErroneous()) { 4192 // The caller wants an exception, but it was thrown in a 4193 // different thread. Synthesize one here. 4194 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4195 PrettyDescriptor(klass.Get()).c_str()); 4196 return false; 4197 } 4198 if (klass->IsInitialized()) { 4199 return true; 4200 } 4201 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4202 << klass->GetStatus(); 4203 } 4204 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4205} 4206 4207bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4208 if (klass->IsInterface()) { 4209 return true; 4210 } 4211 // Begin with the methods local to the superclass. 4212 StackHandleScope<2> hs(Thread::Current()); 4213 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4214 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4215 if (klass->HasSuperClass() && 4216 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4217 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4218 mh.ChangeMethod(klass->GetVTableEntry(i)); 4219 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4220 if (mh.GetMethod() != super_mh.GetMethod() && 4221 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4222 ThrowLinkageError(klass.Get(), 4223 "Class %s method %s resolves differently in superclass %s", 4224 PrettyDescriptor(klass.Get()).c_str(), 4225 PrettyMethod(mh.GetMethod()).c_str(), 4226 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4227 return false; 4228 } 4229 } 4230 } 4231 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4232 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4233 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4234 for (uint32_t j = 0; j < num_methods; ++j) { 4235 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4236 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4237 if (mh.GetMethod() != super_mh.GetMethod() && 4238 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4239 ThrowLinkageError(klass.Get(), 4240 "Class %s method %s resolves differently in interface %s", 4241 PrettyDescriptor(klass.Get()).c_str(), 4242 PrettyMethod(mh.GetMethod()).c_str(), 4243 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4244 return false; 4245 } 4246 } 4247 } 4248 } 4249 return true; 4250} 4251 4252bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4253 bool can_init_parents) { 4254 DCHECK(c.Get() != nullptr); 4255 if (c->IsInitialized()) { 4256 EnsurePreverifiedMethods(c); 4257 return true; 4258 } 4259 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4260 Thread* self = Thread::Current(); 4261 if (!success) { 4262 if (can_init_fields && can_init_parents) { 4263 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4264 } 4265 } else { 4266 self->AssertNoPendingException(); 4267 } 4268 return success; 4269} 4270 4271void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4272 mirror::Class* c, 4273 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4274 const byte* class_data = dex_file.GetClassData(dex_class_def); 4275 ClassDataItemIterator it(dex_file, class_data); 4276 StackHandleScope<2> hs(Thread::Current()); 4277 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4278 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4279 CHECK(!kMovingFields); 4280 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4281 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4282 } 4283} 4284 4285void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4286 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4287 if (fields != nullptr) { 4288 for (int index = 0; index < fields->GetLength(); index ++) { 4289 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4290 fields->Get(index)->SetDeclaringClass(new_class); 4291 } 4292 } 4293 } 4294 4295 fields = new_class->GetSFields(); 4296 if (fields != nullptr) { 4297 for (int index = 0; index < fields->GetLength(); index ++) { 4298 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4299 fields->Get(index)->SetDeclaringClass(new_class); 4300 } 4301 } 4302 } 4303 4304 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4305 if (methods != nullptr) { 4306 for (int index = 0; index < methods->GetLength(); index ++) { 4307 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4308 methods->Get(index)->SetDeclaringClass(new_class); 4309 } 4310 } 4311 } 4312 4313 methods = new_class->GetVirtualMethods(); 4314 if (methods != nullptr) { 4315 for (int index = 0; index < methods->GetLength(); index ++) { 4316 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4317 methods->Get(index)->SetDeclaringClass(new_class); 4318 } 4319 } 4320 } 4321} 4322 4323bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4324 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4325 mirror::Class** new_class) { 4326 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4327 4328 if (!LinkSuperClass(klass)) { 4329 return false; 4330 } 4331 if (!LinkMethods(self, klass, interfaces)) { 4332 return false; 4333 } 4334 if (!LinkInstanceFields(klass)) { 4335 return false; 4336 } 4337 size_t class_size; 4338 if (!LinkStaticFields(klass, &class_size)) { 4339 return false; 4340 } 4341 CreateReferenceInstanceOffsets(klass); 4342 CreateReferenceStaticOffsets(klass); 4343 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4344 4345 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4346 // We don't need to retire this class as it has no embedded tables or it was created the 4347 // correct size during class linker initialization. 4348 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4349 4350 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4351 klass->PopulateEmbeddedImtAndVTable(); 4352 } 4353 4354 // This will notify waiters on klass that saw the not yet resolved 4355 // class in the class_table_ during EnsureResolved. 4356 klass->SetStatus(mirror::Class::kStatusResolved, self); 4357 *new_class = klass.Get(); 4358 } else { 4359 CHECK(!klass->IsResolved()); 4360 // Retire the temporary class and create the correctly sized resolved class. 4361 *new_class = klass->CopyOf(self, class_size); 4362 if (UNLIKELY(*new_class == NULL)) { 4363 CHECK(self->IsExceptionPending()); // Expect an OOME. 4364 klass->SetStatus(mirror::Class::kStatusError, self); 4365 return false; 4366 } 4367 4368 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4369 StackHandleScope<1> hs(self); 4370 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4371 ObjectLock<mirror::Class> lock(self, new_class_h); 4372 4373 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4374 4375 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4376 CHECK(existing == NULL || existing == klass.Get()); 4377 4378 // This will notify waiters on temp class that saw the not yet resolved class in the 4379 // class_table_ during EnsureResolved. 4380 klass->SetStatus(mirror::Class::kStatusRetired, self); 4381 4382 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4383 // This will notify waiters on new_class that saw the not yet resolved 4384 // class in the class_table_ during EnsureResolved. 4385 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4386 } 4387 return true; 4388} 4389 4390bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4391 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4392 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4393 uint16_t super_class_idx = class_def.superclass_idx_; 4394 if (super_class_idx != DexFile::kDexNoIndex16) { 4395 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4396 if (super_class == NULL) { 4397 DCHECK(Thread::Current()->IsExceptionPending()); 4398 return false; 4399 } 4400 // Verify 4401 if (!klass->CanAccess(super_class)) { 4402 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4403 PrettyDescriptor(super_class).c_str(), 4404 PrettyDescriptor(klass.Get()).c_str()); 4405 return false; 4406 } 4407 CHECK(super_class->IsResolved()); 4408 klass->SetSuperClass(super_class); 4409 } 4410 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4411 if (interfaces != NULL) { 4412 for (size_t i = 0; i < interfaces->Size(); i++) { 4413 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4414 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4415 if (interface == NULL) { 4416 DCHECK(Thread::Current()->IsExceptionPending()); 4417 return false; 4418 } 4419 // Verify 4420 if (!klass->CanAccess(interface)) { 4421 // TODO: the RI seemed to ignore this in my testing. 4422 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4423 PrettyDescriptor(interface).c_str(), 4424 PrettyDescriptor(klass.Get()).c_str()); 4425 return false; 4426 } 4427 } 4428 } 4429 // Mark the class as loaded. 4430 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4431 return true; 4432} 4433 4434bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4435 CHECK(!klass->IsPrimitive()); 4436 mirror::Class* super = klass->GetSuperClass(); 4437 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4438 if (super != NULL) { 4439 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4440 return false; 4441 } 4442 return true; 4443 } 4444 if (super == NULL) { 4445 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4446 PrettyDescriptor(klass.Get()).c_str()); 4447 return false; 4448 } 4449 // Verify 4450 if (super->IsFinal() || super->IsInterface()) { 4451 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4452 PrettyDescriptor(super).c_str(), 4453 PrettyDescriptor(klass.Get()).c_str(), 4454 super->IsFinal() ? "declared final" : "an interface"); 4455 return false; 4456 } 4457 if (!klass->CanAccess(super)) { 4458 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4459 PrettyDescriptor(super).c_str(), 4460 PrettyDescriptor(klass.Get()).c_str()); 4461 return false; 4462 } 4463 4464 // Inherit kAccClassIsFinalizable from the superclass in case this 4465 // class doesn't override finalize. 4466 if (super->IsFinalizable()) { 4467 klass->SetFinalizable(); 4468 } 4469 4470 // Inherit reference flags (if any) from the superclass. 4471 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4472 if (reference_flags != 0) { 4473 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4474 } 4475 // Disallow custom direct subclasses of java.lang.ref.Reference. 4476 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4477 ThrowLinkageError(klass.Get(), 4478 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4479 PrettyDescriptor(klass.Get()).c_str()); 4480 return false; 4481 } 4482 4483 if (kIsDebugBuild) { 4484 // Ensure super classes are fully resolved prior to resolving fields.. 4485 while (super != NULL) { 4486 CHECK(super->IsResolved()); 4487 super = super->GetSuperClass(); 4488 } 4489 } 4490 return true; 4491} 4492 4493// Populate the class vtable and itable. Compute return type indices. 4494bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4495 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4496 if (klass->IsInterface()) { 4497 // No vtable. 4498 size_t count = klass->NumVirtualMethods(); 4499 if (!IsUint(16, count)) { 4500 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4501 return false; 4502 } 4503 for (size_t i = 0; i < count; ++i) { 4504 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4505 } 4506 // Link interface method tables 4507 return LinkInterfaceMethods(klass, interfaces); 4508 } else { 4509 // Link virtual and interface method tables 4510 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4511 } 4512 return true; 4513} 4514 4515bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4516 if (klass->HasSuperClass()) { 4517 uint32_t max_count = klass->NumVirtualMethods() + 4518 klass->GetSuperClass()->GetVTableLength(); 4519 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4520 CHECK_LE(actual_count, max_count); 4521 StackHandleScope<4> hs(self); 4522 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4523 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4524 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4525 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4526 if (UNLIKELY(vtable.Get() == nullptr)) { 4527 CHECK(self->IsExceptionPending()); // OOME. 4528 return false; 4529 } 4530 int len = super_class->GetVTableLength(); 4531 for (int i = 0; i < len; i++) { 4532 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4533 } 4534 } else { 4535 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4536 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4537 if (UNLIKELY(vtable.Get() == nullptr)) { 4538 CHECK(self->IsExceptionPending()); // OOME. 4539 return false; 4540 } 4541 } 4542 4543 // See if any of our virtual methods override the superclass. 4544 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4545 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4546 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4547 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4548 local_mh.ChangeMethod(local_method); 4549 size_t j = 0; 4550 for (; j < actual_count; ++j) { 4551 mirror::ArtMethod* super_method = vtable->Get(j); 4552 super_mh.ChangeMethod(super_method); 4553 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4554 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4555 super_method->GetAccessFlags())) { 4556 if (super_method->IsFinal()) { 4557 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4558 PrettyMethod(local_method).c_str(), 4559 super_method->GetDeclaringClassDescriptor()); 4560 return false; 4561 } 4562 vtable->Set<false>(j, local_method); 4563 local_method->SetMethodIndex(j); 4564 break; 4565 } else { 4566 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4567 << " would have incorrectly overridden the package-private method in " 4568 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4569 } 4570 } 4571 } 4572 if (j == actual_count) { 4573 // Not overriding, append. 4574 vtable->Set<false>(actual_count, local_method); 4575 local_method->SetMethodIndex(actual_count); 4576 actual_count += 1; 4577 } 4578 } 4579 if (!IsUint(16, actual_count)) { 4580 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4581 return false; 4582 } 4583 // Shrink vtable if possible 4584 CHECK_LE(actual_count, max_count); 4585 if (actual_count < max_count) { 4586 vtable.Assign(vtable->CopyOf(self, actual_count)); 4587 if (UNLIKELY(vtable.Get() == NULL)) { 4588 CHECK(self->IsExceptionPending()); // OOME. 4589 return false; 4590 } 4591 } 4592 klass->SetVTable(vtable.Get()); 4593 } else { 4594 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4595 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4596 if (!IsUint(16, num_virtual_methods)) { 4597 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4598 return false; 4599 } 4600 StackHandleScope<1> hs(self); 4601 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4602 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4603 if (UNLIKELY(vtable.Get() == NULL)) { 4604 CHECK(self->IsExceptionPending()); // OOME. 4605 return false; 4606 } 4607 for (size_t i = 0; i < num_virtual_methods; ++i) { 4608 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4609 vtable->Set<false>(i, virtual_method); 4610 virtual_method->SetMethodIndex(i & 0xFFFF); 4611 } 4612 klass->SetVTable(vtable.Get()); 4613 } 4614 return true; 4615} 4616 4617bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4618 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4619 Thread* const self = Thread::Current(); 4620 Runtime* const runtime = Runtime::Current(); 4621 // Set the imt table to be all conflicts by default. 4622 klass->SetImTable(runtime->GetDefaultImt()); 4623 size_t super_ifcount; 4624 if (klass->HasSuperClass()) { 4625 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4626 } else { 4627 super_ifcount = 0; 4628 } 4629 uint32_t num_interfaces = 4630 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4631 size_t ifcount = super_ifcount + num_interfaces; 4632 for (size_t i = 0; i < num_interfaces; i++) { 4633 mirror::Class* interface = 4634 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4635 interfaces->Get(i); 4636 ifcount += interface->GetIfTableCount(); 4637 } 4638 if (ifcount == 0) { 4639 // Class implements no interfaces. 4640 DCHECK_EQ(klass->GetIfTableCount(), 0); 4641 DCHECK(klass->GetIfTable() == NULL); 4642 return true; 4643 } 4644 if (ifcount == super_ifcount) { 4645 // Class implements same interfaces as parent, are any of these not marker interfaces? 4646 bool has_non_marker_interface = false; 4647 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4648 for (size_t i = 0; i < ifcount; ++i) { 4649 if (super_iftable->GetMethodArrayCount(i) > 0) { 4650 has_non_marker_interface = true; 4651 break; 4652 } 4653 } 4654 if (!has_non_marker_interface) { 4655 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4656 klass->SetIfTable(super_iftable); 4657 return true; 4658 } 4659 } 4660 StackHandleScope<4> hs(self); 4661 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4662 if (UNLIKELY(iftable.Get() == NULL)) { 4663 CHECK(self->IsExceptionPending()); // OOME. 4664 return false; 4665 } 4666 if (super_ifcount != 0) { 4667 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4668 for (size_t i = 0; i < super_ifcount; i++) { 4669 mirror::Class* super_interface = super_iftable->GetInterface(i); 4670 iftable->SetInterface(i, super_interface); 4671 } 4672 } 4673 // Flatten the interface inheritance hierarchy. 4674 size_t idx = super_ifcount; 4675 for (size_t i = 0; i < num_interfaces; i++) { 4676 mirror::Class* interface = 4677 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4678 interfaces->Get(i); 4679 DCHECK(interface != NULL); 4680 if (!interface->IsInterface()) { 4681 std::string temp; 4682 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4683 PrettyDescriptor(klass.Get()).c_str(), 4684 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4685 return false; 4686 } 4687 // Check if interface is already in iftable 4688 bool duplicate = false; 4689 for (size_t j = 0; j < idx; j++) { 4690 mirror::Class* existing_interface = iftable->GetInterface(j); 4691 if (existing_interface == interface) { 4692 duplicate = true; 4693 break; 4694 } 4695 } 4696 if (!duplicate) { 4697 // Add this non-duplicate interface. 4698 iftable->SetInterface(idx++, interface); 4699 // Add this interface's non-duplicate super-interfaces. 4700 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4701 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4702 bool super_duplicate = false; 4703 for (size_t k = 0; k < idx; k++) { 4704 mirror::Class* existing_interface = iftable->GetInterface(k); 4705 if (existing_interface == super_interface) { 4706 super_duplicate = true; 4707 break; 4708 } 4709 } 4710 if (!super_duplicate) { 4711 iftable->SetInterface(idx++, super_interface); 4712 } 4713 } 4714 } 4715 } 4716 // Shrink iftable in case duplicates were found 4717 if (idx < ifcount) { 4718 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4719 if (UNLIKELY(iftable.Get() == NULL)) { 4720 CHECK(self->IsExceptionPending()); // OOME. 4721 return false; 4722 } 4723 ifcount = idx; 4724 } else { 4725 CHECK_EQ(idx, ifcount); 4726 } 4727 klass->SetIfTable(iftable.Get()); 4728 4729 // If we're an interface, we don't need the vtable pointers, so we're done. 4730 if (klass->IsInterface()) { 4731 return true; 4732 } 4733 // Allocate imtable 4734 bool imtable_changed = false; 4735 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4736 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4737 if (UNLIKELY(imtable.Get() == NULL)) { 4738 CHECK(self->IsExceptionPending()); // OOME. 4739 return false; 4740 } 4741 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4742 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4743 std::vector<mirror::ArtMethod*> miranda_list; 4744 for (size_t i = 0; i < ifcount; ++i) { 4745 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4746 if (num_methods > 0) { 4747 StackHandleScope<2> hs(self); 4748 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4749 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4750 if (UNLIKELY(method_array.Get() == nullptr)) { 4751 CHECK(self->IsExceptionPending()); // OOME. 4752 return false; 4753 } 4754 iftable->SetMethodArray(i, method_array.Get()); 4755 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4756 hs.NewHandle(klass->GetVTableDuringLinking())); 4757 for (size_t j = 0; j < num_methods; ++j) { 4758 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4759 interface_mh.ChangeMethod(interface_method); 4760 int32_t k; 4761 // For each method listed in the interface's method list, find the 4762 // matching method in our class's method list. We want to favor the 4763 // subclass over the superclass, which just requires walking 4764 // back from the end of the vtable. (This only matters if the 4765 // superclass defines a private method and this class redefines 4766 // it -- otherwise it would use the same vtable slot. In .dex files 4767 // those don't end up in the virtual method table, so it shouldn't 4768 // matter which direction we go. We walk it backward anyway.) 4769 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4770 mirror::ArtMethod* vtable_method = vtable->Get(k); 4771 vtable_mh.ChangeMethod(vtable_method); 4772 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4773 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4774 ThrowIllegalAccessError( 4775 klass.Get(), 4776 "Method '%s' implementing interface method '%s' is not public", 4777 PrettyMethod(vtable_method).c_str(), 4778 PrettyMethod(interface_method).c_str()); 4779 return false; 4780 } 4781 method_array->Set<false>(j, vtable_method); 4782 // Place method in imt if entry is empty, place conflict otherwise. 4783 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4784 if (imtable->Get(imt_index) == NULL) { 4785 imtable->Set<false>(imt_index, vtable_method); 4786 imtable_changed = true; 4787 } else { 4788 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4789 } 4790 break; 4791 } 4792 } 4793 if (k < 0) { 4794 StackHandleScope<1> hs(self); 4795 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4796 for (mirror::ArtMethod* mir_method : miranda_list) { 4797 vtable_mh.ChangeMethod(mir_method); 4798 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4799 miranda_method.Assign(mir_method); 4800 break; 4801 } 4802 } 4803 if (miranda_method.Get() == NULL) { 4804 // Point the interface table at a phantom slot. 4805 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4806 if (UNLIKELY(miranda_method.Get() == NULL)) { 4807 CHECK(self->IsExceptionPending()); // OOME. 4808 return false; 4809 } 4810 // TODO: If a methods move then the miranda_list may hold stale references. 4811 miranda_list.push_back(miranda_method.Get()); 4812 } 4813 method_array->Set<false>(j, miranda_method.Get()); 4814 } 4815 } 4816 } 4817 } 4818 if (imtable_changed) { 4819 // Fill in empty entries in interface method table with conflict. 4820 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4821 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4822 if (imtable->Get(i) == NULL) { 4823 imtable->Set<false>(i, imt_conflict_method); 4824 } 4825 } 4826 klass->SetImTable(imtable.Get()); 4827 } 4828 if (!miranda_list.empty()) { 4829 int old_method_count = klass->NumVirtualMethods(); 4830 int new_method_count = old_method_count + miranda_list.size(); 4831 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4832 if (old_method_count == 0) { 4833 virtuals = AllocArtMethodArray(self, new_method_count); 4834 } else { 4835 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4836 } 4837 if (UNLIKELY(virtuals == NULL)) { 4838 CHECK(self->IsExceptionPending()); // OOME. 4839 return false; 4840 } 4841 klass->SetVirtualMethods(virtuals); 4842 4843 StackHandleScope<1> hs(self); 4844 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4845 hs.NewHandle(klass->GetVTableDuringLinking())); 4846 CHECK(vtable.Get() != NULL); 4847 int old_vtable_count = vtable->GetLength(); 4848 int new_vtable_count = old_vtable_count + miranda_list.size(); 4849 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4850 if (UNLIKELY(vtable.Get() == NULL)) { 4851 CHECK(self->IsExceptionPending()); // OOME. 4852 return false; 4853 } 4854 for (size_t i = 0; i < miranda_list.size(); ++i) { 4855 mirror::ArtMethod* method = miranda_list[i]; 4856 // Leave the declaring class alone as type indices are relative to it 4857 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4858 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4859 klass->SetVirtualMethod(old_method_count + i, method); 4860 vtable->Set<false>(old_vtable_count + i, method); 4861 } 4862 // TODO: do not assign to the vtable field until it is fully constructed. 4863 klass->SetVTable(vtable.Get()); 4864 } 4865 4866 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4867 for (int i = 0; i < vtable->GetLength(); ++i) { 4868 CHECK(vtable->Get(i) != NULL); 4869 } 4870 4871// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4872 4873 return true; 4874} 4875 4876bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4877 CHECK(klass.Get() != NULL); 4878 return LinkFields(klass, false, nullptr); 4879} 4880 4881bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4882 CHECK(klass.Get() != NULL); 4883 return LinkFields(klass, true, class_size); 4884} 4885 4886struct LinkFieldsComparator { 4887 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4888 } 4889 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4890 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4891 NO_THREAD_SAFETY_ANALYSIS { 4892 // First come reference fields, then 64-bit, and finally 32-bit 4893 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4894 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4895 if (type1 != type2) { 4896 bool is_primitive1 = type1 != Primitive::kPrimNot; 4897 bool is_primitive2 = type2 != Primitive::kPrimNot; 4898 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4899 type1 == Primitive::kPrimDouble); 4900 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4901 type2 == Primitive::kPrimDouble); 4902 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4903 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4904 if (order1 != order2) { 4905 return order1 < order2; 4906 } 4907 } 4908 // same basic group? then sort by string. 4909 return strcmp(field1->GetName(), field2->GetName()) < 0; 4910 } 4911}; 4912 4913bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4914 size_t num_fields = 4915 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4916 4917 mirror::ObjectArray<mirror::ArtField>* fields = 4918 is_static ? klass->GetSFields() : klass->GetIFields(); 4919 4920 // Initialize field_offset 4921 MemberOffset field_offset(0); 4922 if (is_static) { 4923 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4924 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4925 // Static fields come after the embedded tables. 4926 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4927 0, 0, 0); 4928 } 4929 field_offset = MemberOffset(base); 4930 } else { 4931 mirror::Class* super_class = klass->GetSuperClass(); 4932 if (super_class != NULL) { 4933 CHECK(super_class->IsResolved()) 4934 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4935 field_offset = MemberOffset(super_class->GetObjectSize()); 4936 } 4937 } 4938 4939 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4940 4941 // we want a relatively stable order so that adding new fields 4942 // minimizes disruption of C++ version such as Class and Method. 4943 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4944 for (size_t i = 0; i < num_fields; i++) { 4945 mirror::ArtField* f = fields->Get(i); 4946 CHECK(f != NULL) << PrettyClass(klass.Get()); 4947 grouped_and_sorted_fields.push_back(f); 4948 } 4949 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4950 LinkFieldsComparator()); 4951 4952 // References should be at the front. 4953 size_t current_field = 0; 4954 size_t num_reference_fields = 0; 4955 for (; current_field < num_fields; current_field++) { 4956 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4957 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4958 bool isPrimitive = type != Primitive::kPrimNot; 4959 if (isPrimitive) { 4960 break; // past last reference, move on to the next phase 4961 } 4962 grouped_and_sorted_fields.pop_front(); 4963 num_reference_fields++; 4964 fields->Set<false>(current_field, field); 4965 field->SetOffset(field_offset); 4966 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4967 } 4968 4969 // Now we want to pack all of the double-wide fields together. If 4970 // we're not aligned, though, we want to shuffle one 32-bit field 4971 // into place. If we can't find one, we'll have to pad it. 4972 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4973 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4974 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4975 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4976 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4977 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4978 continue; 4979 } 4980 fields->Set<false>(current_field++, field); 4981 field->SetOffset(field_offset); 4982 // drop the consumed field 4983 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4984 break; 4985 } 4986 // whether we found a 32-bit field for padding or not, we advance 4987 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4988 } 4989 4990 // Alignment is good, shuffle any double-wide fields forward, and 4991 // finish assigning field offsets to all fields. 4992 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4993 << PrettyClass(klass.Get()); 4994 while (!grouped_and_sorted_fields.empty()) { 4995 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4996 grouped_and_sorted_fields.pop_front(); 4997 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4998 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4999 fields->Set<false>(current_field, field); 5000 field->SetOffset(field_offset); 5001 field_offset = MemberOffset(field_offset.Uint32Value() + 5002 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 5003 ? sizeof(uint64_t) 5004 : sizeof(uint32_t))); 5005 current_field++; 5006 } 5007 5008 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5009 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5010 // We know there are no non-reference fields in the Reference classes, and we know 5011 // that 'referent' is alphabetically last, so this is easy... 5012 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5013 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5014 --num_reference_fields; 5015 } 5016 5017 if (kIsDebugBuild) { 5018 // Make sure that all reference fields appear before 5019 // non-reference fields, and all double-wide fields are aligned. 5020 bool seen_non_ref = false; 5021 for (size_t i = 0; i < num_fields; i++) { 5022 mirror::ArtField* field = fields->Get(i); 5023 if (false) { // enable to debug field layout 5024 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5025 << " class=" << PrettyClass(klass.Get()) 5026 << " field=" << PrettyField(field) 5027 << " offset=" 5028 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5029 } 5030 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5031 bool is_primitive = type != Primitive::kPrimNot; 5032 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5033 strcmp("referent", field->GetName()) == 0) { 5034 is_primitive = true; // We lied above, so we have to expect a lie here. 5035 } 5036 if (is_primitive) { 5037 if (!seen_non_ref) { 5038 seen_non_ref = true; 5039 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5040 } 5041 } else { 5042 DCHECK(!seen_non_ref) << PrettyField(field); 5043 } 5044 } 5045 if (!seen_non_ref) { 5046 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5047 } 5048 } 5049 5050 size_t size = field_offset.Uint32Value(); 5051 // Update klass 5052 if (is_static) { 5053 klass->SetNumReferenceStaticFields(num_reference_fields); 5054 *class_size = size; 5055 } else { 5056 klass->SetNumReferenceInstanceFields(num_reference_fields); 5057 if (!klass->IsVariableSize()) { 5058 std::string temp; 5059 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5060 size_t previous_size = klass->GetObjectSize(); 5061 if (previous_size != 0) { 5062 // Make sure that we didn't originally have an incorrect size. 5063 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5064 } 5065 klass->SetObjectSize(size); 5066 } 5067 } 5068 return true; 5069} 5070 5071// Set the bitmap of reference offsets, refOffsets, from the ifields 5072// list. 5073void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5074 uint32_t reference_offsets = 0; 5075 mirror::Class* super_class = klass->GetSuperClass(); 5076 if (super_class != NULL) { 5077 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5078 // If our superclass overflowed, we don't stand a chance. 5079 if (reference_offsets == CLASS_WALK_SUPER) { 5080 klass->SetReferenceInstanceOffsets(reference_offsets); 5081 return; 5082 } 5083 } 5084 CreateReferenceOffsets(klass, false, reference_offsets); 5085} 5086 5087void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 5088 CreateReferenceOffsets(klass, true, 0); 5089} 5090 5091void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 5092 uint32_t reference_offsets) { 5093 size_t num_reference_fields = 5094 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 5095 : klass->NumReferenceInstanceFieldsDuringLinking(); 5096 mirror::ObjectArray<mirror::ArtField>* fields = 5097 is_static ? klass->GetSFields() : klass->GetIFields(); 5098 // All of the fields that contain object references are guaranteed 5099 // to be at the beginning of the fields list. 5100 for (size_t i = 0; i < num_reference_fields; ++i) { 5101 // Note that byte_offset is the offset from the beginning of 5102 // object, not the offset into instance data 5103 mirror::ArtField* field = fields->Get(i); 5104 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5105 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5106 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5107 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5108 CHECK_NE(new_bit, 0U); 5109 reference_offsets |= new_bit; 5110 } else { 5111 reference_offsets = CLASS_WALK_SUPER; 5112 break; 5113 } 5114 } 5115 // Update fields in klass 5116 if (is_static) { 5117 klass->SetReferenceStaticOffsets(reference_offsets); 5118 } else { 5119 klass->SetReferenceInstanceOffsets(reference_offsets); 5120 } 5121} 5122 5123mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5124 Handle<mirror::DexCache> dex_cache) { 5125 DCHECK(dex_cache.Get() != nullptr); 5126 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5127 if (resolved != NULL) { 5128 return resolved; 5129 } 5130 uint32_t utf16_length; 5131 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5132 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5133 dex_cache->SetResolvedString(string_idx, string); 5134 return string; 5135} 5136 5137mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5138 mirror::Class* referrer) { 5139 StackHandleScope<2> hs(Thread::Current()); 5140 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5141 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5142 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5143} 5144 5145mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5146 Handle<mirror::DexCache> dex_cache, 5147 Handle<mirror::ClassLoader> class_loader) { 5148 DCHECK(dex_cache.Get() != NULL); 5149 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5150 if (resolved == NULL) { 5151 Thread* self = Thread::Current(); 5152 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5153 resolved = FindClass(self, descriptor, class_loader); 5154 if (resolved != NULL) { 5155 // TODO: we used to throw here if resolved's class loader was not the 5156 // boot class loader. This was to permit different classes with the 5157 // same name to be loaded simultaneously by different loaders 5158 dex_cache->SetResolvedType(type_idx, resolved); 5159 } else { 5160 CHECK(self->IsExceptionPending()) 5161 << "Expected pending exception for failed resolution of: " << descriptor; 5162 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5163 StackHandleScope<1> hs(self); 5164 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5165 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5166 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5167 self->ClearException(); 5168 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5169 self->GetException(NULL)->SetCause(cause.Get()); 5170 } 5171 } 5172 } 5173 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5174 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5175 return resolved; 5176} 5177 5178mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5179 Handle<mirror::DexCache> dex_cache, 5180 Handle<mirror::ClassLoader> class_loader, 5181 Handle<mirror::ArtMethod> referrer, 5182 InvokeType type) { 5183 DCHECK(dex_cache.Get() != nullptr); 5184 // Check for hit in the dex cache. 5185 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5186 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5187 return resolved; 5188 } 5189 // Fail, get the declaring class. 5190 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5191 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5192 if (klass == nullptr) { 5193 DCHECK(Thread::Current()->IsExceptionPending()); 5194 return nullptr; 5195 } 5196 // Scan using method_idx, this saves string compares but will only hit for matching dex 5197 // caches/files. 5198 switch (type) { 5199 case kDirect: // Fall-through. 5200 case kStatic: 5201 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5202 break; 5203 case kInterface: 5204 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5205 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5206 break; 5207 case kSuper: // Fall-through. 5208 case kVirtual: 5209 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5210 break; 5211 default: 5212 LOG(FATAL) << "Unreachable - invocation type: " << type; 5213 } 5214 if (resolved == nullptr) { 5215 // Search by name, which works across dex files. 5216 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5217 const Signature signature = dex_file.GetMethodSignature(method_id); 5218 switch (type) { 5219 case kDirect: // Fall-through. 5220 case kStatic: 5221 resolved = klass->FindDirectMethod(name, signature); 5222 break; 5223 case kInterface: 5224 resolved = klass->FindInterfaceMethod(name, signature); 5225 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5226 break; 5227 case kSuper: // Fall-through. 5228 case kVirtual: 5229 resolved = klass->FindVirtualMethod(name, signature); 5230 break; 5231 } 5232 } 5233 // If we found a method, check for incompatible class changes. 5234 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5235 // Be a good citizen and update the dex cache to speed subsequent calls. 5236 dex_cache->SetResolvedMethod(method_idx, resolved); 5237 return resolved; 5238 } else { 5239 // If we had a method, it's an incompatible-class-change error. 5240 if (resolved != nullptr) { 5241 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5242 } else { 5243 // We failed to find the method which means either an access error, an incompatible class 5244 // change, or no such method. First try to find the method among direct and virtual methods. 5245 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5246 const Signature signature = dex_file.GetMethodSignature(method_id); 5247 switch (type) { 5248 case kDirect: 5249 case kStatic: 5250 resolved = klass->FindVirtualMethod(name, signature); 5251 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5252 // have had a resolved method before, which triggers the "true" branch above. 5253 break; 5254 case kInterface: 5255 case kVirtual: 5256 case kSuper: 5257 resolved = klass->FindDirectMethod(name, signature); 5258 break; 5259 } 5260 5261 // If we found something, check that it can be accessed by the referrer. 5262 if (resolved != nullptr && referrer.Get() != nullptr) { 5263 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5264 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5265 if (!referring_class->CanAccess(methods_class)) { 5266 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5267 resolved, type); 5268 return nullptr; 5269 } else if (!referring_class->CanAccessMember(methods_class, 5270 resolved->GetAccessFlags())) { 5271 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5272 return nullptr; 5273 } 5274 } 5275 5276 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5277 // methods and throw if we find the method there. If we find nothing, throw a 5278 // NoSuchMethodError. 5279 switch (type) { 5280 case kDirect: 5281 case kStatic: 5282 if (resolved != nullptr) { 5283 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5284 } else { 5285 resolved = klass->FindInterfaceMethod(name, signature); 5286 if (resolved != nullptr) { 5287 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5288 } else { 5289 ThrowNoSuchMethodError(type, klass, name, signature); 5290 } 5291 } 5292 break; 5293 case kInterface: 5294 if (resolved != nullptr) { 5295 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5296 } else { 5297 resolved = klass->FindVirtualMethod(name, signature); 5298 if (resolved != nullptr) { 5299 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5300 } else { 5301 ThrowNoSuchMethodError(type, klass, name, signature); 5302 } 5303 } 5304 break; 5305 case kSuper: 5306 if (resolved != nullptr) { 5307 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5308 } else { 5309 ThrowNoSuchMethodError(type, klass, name, signature); 5310 } 5311 break; 5312 case kVirtual: 5313 if (resolved != nullptr) { 5314 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5315 } else { 5316 resolved = klass->FindInterfaceMethod(name, signature); 5317 if (resolved != nullptr) { 5318 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5319 } else { 5320 ThrowNoSuchMethodError(type, klass, name, signature); 5321 } 5322 } 5323 break; 5324 } 5325 } 5326 DCHECK(Thread::Current()->IsExceptionPending()); 5327 return nullptr; 5328 } 5329} 5330 5331mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5332 Handle<mirror::DexCache> dex_cache, 5333 Handle<mirror::ClassLoader> class_loader, 5334 bool is_static) { 5335 DCHECK(dex_cache.Get() != nullptr); 5336 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5337 if (resolved != nullptr) { 5338 return resolved; 5339 } 5340 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5341 Thread* const self = Thread::Current(); 5342 StackHandleScope<1> hs(self); 5343 Handle<mirror::Class> klass( 5344 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5345 if (klass.Get() == nullptr) { 5346 DCHECK(Thread::Current()->IsExceptionPending()); 5347 return nullptr; 5348 } 5349 5350 if (is_static) { 5351 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5352 } else { 5353 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5354 } 5355 5356 if (resolved == nullptr) { 5357 const char* name = dex_file.GetFieldName(field_id); 5358 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5359 if (is_static) { 5360 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5361 } else { 5362 resolved = klass->FindInstanceField(name, type); 5363 } 5364 if (resolved == nullptr) { 5365 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5366 return NULL; 5367 } 5368 } 5369 dex_cache->SetResolvedField(field_idx, resolved); 5370 return resolved; 5371} 5372 5373mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5374 uint32_t field_idx, 5375 Handle<mirror::DexCache> dex_cache, 5376 Handle<mirror::ClassLoader> class_loader) { 5377 DCHECK(dex_cache.Get() != nullptr); 5378 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5379 if (resolved != nullptr) { 5380 return resolved; 5381 } 5382 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5383 Thread* self = Thread::Current(); 5384 StackHandleScope<1> hs(self); 5385 Handle<mirror::Class> klass( 5386 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5387 if (klass.Get() == NULL) { 5388 DCHECK(Thread::Current()->IsExceptionPending()); 5389 return NULL; 5390 } 5391 5392 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5393 StringPiece type(dex_file.StringDataByIdx( 5394 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5395 resolved = mirror::Class::FindField(self, klass, name, type); 5396 if (resolved != NULL) { 5397 dex_cache->SetResolvedField(field_idx, resolved); 5398 } else { 5399 ThrowNoSuchFieldError("", klass.Get(), type, name); 5400 } 5401 return resolved; 5402} 5403 5404const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5405 uint32_t* length) { 5406 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5407 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5408 const DexFile& dex_file = *dex_cache->GetDexFile(); 5409 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5410 return dex_file.GetMethodShorty(method_id, length); 5411} 5412 5413void ClassLinker::DumpAllClasses(int flags) { 5414 if (dex_cache_image_class_lookup_required_) { 5415 MoveImageClassesToClassTable(); 5416 } 5417 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5418 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5419 std::vector<mirror::Class*> all_classes; 5420 { 5421 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5422 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5423 mirror::Class* klass = it.second.Read(); 5424 all_classes.push_back(klass); 5425 } 5426 } 5427 5428 for (size_t i = 0; i < all_classes.size(); ++i) { 5429 all_classes[i]->DumpClass(std::cerr, flags); 5430 } 5431} 5432 5433void ClassLinker::DumpForSigQuit(std::ostream& os) { 5434 if (dex_cache_image_class_lookup_required_) { 5435 MoveImageClassesToClassTable(); 5436 } 5437 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5438 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5439} 5440 5441size_t ClassLinker::NumLoadedClasses() { 5442 if (dex_cache_image_class_lookup_required_) { 5443 MoveImageClassesToClassTable(); 5444 } 5445 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5446 return class_table_.size(); 5447} 5448 5449pid_t ClassLinker::GetClassesLockOwner() { 5450 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5451} 5452 5453pid_t ClassLinker::GetDexLockOwner() { 5454 return dex_lock_.GetExclusiveOwnerTid(); 5455} 5456 5457void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5458 DCHECK(!init_done_); 5459 5460 DCHECK(klass != NULL); 5461 DCHECK(klass->GetClassLoader() == NULL); 5462 5463 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5464 DCHECK(class_roots != NULL); 5465 DCHECK(class_roots->Get(class_root) == NULL); 5466 class_roots->Set<false>(class_root, klass); 5467} 5468 5469} // namespace art 5470