class_linker.cc revision 38eecb0f4288a374c9b0b4b4df8793eb5fc6697c
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 <deque> 20#include <memory> 21#include <string> 22#include <utility> 23#include <vector> 24 25#include "base/casts.h" 26#include "base/logging.h" 27#include "base/scoped_flock.h" 28#include "base/stl_util.h" 29#include "base/unix_file/fd_file.h" 30#include "class_linker-inl.h" 31#include "compiler_callbacks.h" 32#include "debugger.h" 33#include "dex_file-inl.h" 34#include "gc_root-inl.h" 35#include "gc/accounting/card_table-inl.h" 36#include "gc/accounting/heap_bitmap.h" 37#include "gc/heap.h" 38#include "gc/space/image_space.h" 39#include "handle_scope.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "method_helper-inl.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "object_lock.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/reference-inl.h" 58#include "mirror/stack_trace_element.h" 59#include "mirror/string-inl.h" 60#include "os.h" 61#include "runtime.h" 62#include "entrypoints/entrypoint_utils.h" 63#include "ScopedLocalRef.h" 64#include "scoped_thread_state_change.h" 65#include "handle_scope-inl.h" 66#include "thread.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 std::string temp; 101 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 102 PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(nullptr), 180 array_iftable_(nullptr), 181 find_array_class_cache_next_victim_(0), 182 init_done_(false), 183 log_new_dex_caches_roots_(false), 184 log_new_class_table_roots_(false), 185 intern_table_(intern_table), 186 portable_resolution_trampoline_(nullptr), 187 quick_resolution_trampoline_(nullptr), 188 portable_imt_conflict_trampoline_(nullptr), 189 quick_imt_conflict_trampoline_(nullptr), 190 quick_generic_jni_trampoline_(nullptr), 191 quick_to_interpreter_bridge_trampoline_(nullptr) { 192 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 193 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 194} 195 196// To set a value for generic JNI. May be necessary in compiler tests. 197extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 198 199void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 200 VLOG(startup) << "ClassLinker::Init"; 201 CHECK(Runtime::Current()->IsCompiler()); 202 203 CHECK(!init_done_); 204 205 // java_lang_Class comes first, it's needed for AllocClass 206 Thread* self = Thread::Current(); 207 gc::Heap* heap = Runtime::Current()->GetHeap(); 208 // The GC can't handle an object with a null class since we can't get the size of this object. 209 heap->IncrementDisableMovingGC(self); 210 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 211 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 212 heap->AllocNonMovableObject<true>(self, nullptr, 213 mirror::Class::ClassClassSize(), 214 VoidFunctor())))); 215 CHECK(java_lang_Class.Get() != NULL); 216 mirror::Class::SetClassClass(java_lang_Class.Get()); 217 java_lang_Class->SetClass(java_lang_Class.Get()); 218 if (kUseBakerOrBrooksReadBarrier) { 219 java_lang_Class->AssertReadBarrierPointer(); 220 } 221 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 222 heap->DecrementDisableMovingGC(self); 223 // AllocClass(mirror::Class*) can now be used 224 225 // Class[] is used for reflection support. 226 Handle<mirror::Class> class_array_class(hs.NewHandle( 227 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 228 class_array_class->SetComponentType(java_lang_Class.Get()); 229 230 // java_lang_Object comes next so that object_array_class can be created. 231 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 232 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 233 CHECK(java_lang_Object.Get() != NULL); 234 // backfill Object as the super class of Class. 235 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 236 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 237 238 // Object[] next to hold class roots. 239 Handle<mirror::Class> object_array_class(hs.NewHandle( 240 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 241 object_array_class->SetComponentType(java_lang_Object.Get()); 242 243 // Setup the char (primitive) class to be used for char[]. 244 Handle<mirror::Class> char_class(hs.NewHandle( 245 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 246 247 // Setup the char[] class to be used for String. 248 Handle<mirror::Class> char_array_class(hs.NewHandle( 249 AllocClass(self, java_lang_Class.Get(), 250 mirror::Array::ClassSize()))); 251 char_array_class->SetComponentType(char_class.Get()); 252 mirror::CharArray::SetArrayClass(char_array_class.Get()); 253 254 // Setup String. 255 Handle<mirror::Class> java_lang_String(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 257 mirror::String::SetClass(java_lang_String.Get()); 258 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 259 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 260 261 // Setup Reference. 262 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 264 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 265 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 266 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Create storage for root classes, save away our work so far (requires descriptors). 269 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 270 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 271 kClassRootsMax)); 272 CHECK(!class_roots_.IsNull()); 273 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 274 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 275 SetClassRoot(kClassArrayClass, class_array_class.Get()); 276 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 277 SetClassRoot(kCharArrayClass, char_array_class.Get()); 278 SetClassRoot(kJavaLangString, java_lang_String.Get()); 279 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 280 281 // Setup the primitive type classes. 282 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 283 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 284 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 285 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 286 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 287 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 288 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 289 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 290 291 // Create array interface entries to populate once we can load system classes. 292 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 293 294 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 295 Handle<mirror::Class> int_array_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 297 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 298 mirror::IntArray::SetArrayClass(int_array_class.Get()); 299 SetClassRoot(kIntArrayClass, int_array_class.Get()); 300 301 // now that these are registered, we can use AllocClass() and AllocObjectArray 302 303 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 304 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 305 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 306 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 307 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 308 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 309 310 // Constructor, Field, Method, and AbstractMethod are necessary so 311 // that FindClass can link members. 312 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 314 CHECK(java_lang_reflect_ArtField.Get() != NULL); 315 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 316 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 317 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 318 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 319 320 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 322 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 323 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 324 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 325 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 326 327 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 328 329 // Set up array classes for string, field, method 330 Handle<mirror::Class> object_array_string(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), 332 mirror::ObjectArray<mirror::String>::ClassSize()))); 333 object_array_string->SetComponentType(java_lang_String.Get()); 334 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 335 336 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 339 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 340 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 341 342 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 345 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 346 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 347 348 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 349 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 350 // these roots. 351 CHECK_NE(0U, boot_class_path.size()); 352 for (size_t i = 0; i != boot_class_path.size(); ++i) { 353 const DexFile* dex_file = boot_class_path[i]; 354 CHECK(dex_file != NULL); 355 AppendToBootClassPath(*dex_file); 356 } 357 358 // now we can use FindSystemClass 359 360 // run char class through InitializePrimitiveClass to finish init 361 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 362 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 363 364 // Create runtime resolution and imt conflict methods. Also setup the default imt. 365 Runtime* runtime = Runtime::Current(); 366 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 367 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 368 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 369 370 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 371 // we do not need friend classes or a publicly exposed setter. 372 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 373 374 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 375 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 376 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 377 CHECK_EQ(java_lang_Object.Get(), Object_class); 378 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 379 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 380 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 381 std::ostringstream os1, os2; 382 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 383 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 384 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 385 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 386 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 387 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 388 CHECK_EQ(java_lang_String.Get(), String_class); 389 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 390 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 391 392 // Setup the primitive array type classes - can't be done until Object has a vtable. 393 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 394 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 395 396 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 397 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 398 399 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 400 CHECK_EQ(char_array_class.Get(), found_char_array_class); 401 402 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 403 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 404 405 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 406 CHECK_EQ(int_array_class.Get(), found_int_array_class); 407 408 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 409 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 410 411 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 412 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 413 414 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 415 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 416 417 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 418 CHECK_EQ(class_array_class.Get(), found_class_array_class); 419 420 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 421 CHECK_EQ(object_array_class.Get(), found_object_array_class); 422 423 // Setup the single, global copy of "iftable". 424 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 425 CHECK(java_lang_Cloneable != NULL); 426 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 427 CHECK(java_io_Serializable != NULL); 428 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 429 // crawl up and explicitly list all of the supers as well. 430 { 431 mirror::IfTable* array_iftable = array_iftable_.Read(); 432 array_iftable->SetInterface(0, java_lang_Cloneable); 433 array_iftable->SetInterface(1, java_io_Serializable); 434 } 435 436 // Sanity check Class[] and Object[]'s interfaces. 437 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 438 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 439 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 440 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 441 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 442 // dex_cache_ fields and register them in class_table_. 443 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 444 CHECK_EQ(java_lang_Class.Get(), Class_class); 445 446 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 447 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 448 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 449 450 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 452 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 453 454 mirror::Class* String_array_class = 455 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 456 CHECK_EQ(object_array_string.Get(), String_array_class); 457 458 mirror::Class* Art_method_array_class = 459 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 460 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 461 462 mirror::Class* Art_field_array_class = 463 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 464 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 465 466 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 467 468 // Create java.lang.reflect.Proxy root. 469 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 470 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 471 472 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 473 // finish initializing Reference class 474 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 475 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 476 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 477 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 478 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 java_lang_ref_FinalizerReference->SetAccessFlags( 482 java_lang_ref_FinalizerReference->GetAccessFlags() | 483 kAccClassIsReference | kAccClassIsFinalizerReference); 484 mirror::Class* java_lang_ref_PhantomReference = 485 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 486 java_lang_ref_PhantomReference->SetAccessFlags( 487 java_lang_ref_PhantomReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsPhantomReference); 489 mirror::Class* java_lang_ref_SoftReference = 490 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 491 java_lang_ref_SoftReference->SetAccessFlags( 492 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 493 mirror::Class* java_lang_ref_WeakReference = 494 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 495 java_lang_ref_WeakReference->SetAccessFlags( 496 java_lang_ref_WeakReference->GetAccessFlags() | 497 kAccClassIsReference | kAccClassIsWeakReference); 498 499 // Setup the ClassLoader, verifying the object_size_. 500 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 501 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 502 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 503 504 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 505 // java.lang.StackTraceElement as a convenience. 506 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 507 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 508 SetClassRoot(kJavaLangClassNotFoundException, 509 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 510 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 511 SetClassRoot(kJavaLangStackTraceElementArrayClass, 512 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 513 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 514 515 FinishInit(self); 516 517 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 518} 519 520void ClassLinker::FinishInit(Thread* self) { 521 VLOG(startup) << "ClassLinker::FinishInit entering"; 522 523 // Let the heap know some key offsets into java.lang.ref instances 524 // Note: we hard code the field indexes here rather than using FindInstanceField 525 // as the types of the field can't be resolved prior to the runtime being 526 // fully initialized 527 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 528 mirror::Class* java_lang_ref_FinalizerReference = 529 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 530 531 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 532 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 533 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 534 535 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 536 CHECK_STREQ(queue->GetName(), "queue"); 537 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 538 539 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 540 CHECK_STREQ(queueNext->GetName(), "queueNext"); 541 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 542 543 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 544 CHECK_STREQ(referent->GetName(), "referent"); 545 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 546 547 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 548 CHECK_STREQ(zombie->GetName(), "zombie"); 549 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 550 551 // ensure all class_roots_ are initialized 552 for (size_t i = 0; i < kClassRootsMax; i++) { 553 ClassRoot class_root = static_cast<ClassRoot>(i); 554 mirror::Class* klass = GetClassRoot(class_root); 555 CHECK(klass != NULL); 556 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 557 // note SetClassRoot does additional validation. 558 // if possible add new checks there to catch errors early 559 } 560 561 CHECK(!array_iftable_.IsNull()); 562 563 // disable the slow paths in FindClass and CreatePrimitiveClass now 564 // that Object, Class, and Object[] are setup 565 init_done_ = true; 566 567 VLOG(startup) << "ClassLinker::FinishInit exiting"; 568} 569 570void ClassLinker::RunRootClinits() { 571 Thread* self = Thread::Current(); 572 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 573 mirror::Class* c = GetClassRoot(ClassRoot(i)); 574 if (!c->IsArrayClass() && !c->IsPrimitive()) { 575 StackHandleScope<1> hs(self); 576 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 577 EnsureInitialized(h_class, true, true); 578 self->AssertNoPendingException(); 579 } 580 } 581} 582 583bool ClassLinker::GenerateOatFile(const char* dex_filename, 584 int oat_fd, 585 const char* oat_cache_filename, 586 std::string* error_msg) { 587 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 588 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 589 590 gc::Heap* heap = Runtime::Current()->GetHeap(); 591 std::string boot_image_option("--boot-image="); 592 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 593 594 std::string dex_file_option("--dex-file="); 595 dex_file_option += dex_filename; 596 597 std::string oat_fd_option("--oat-fd="); 598 StringAppendF(&oat_fd_option, "%d", oat_fd); 599 600 std::string oat_location_option("--oat-location="); 601 oat_location_option += oat_cache_filename; 602 603 std::vector<std::string> argv; 604 argv.push_back(dex2oat); 605 argv.push_back("--runtime-arg"); 606 argv.push_back("-classpath"); 607 argv.push_back("--runtime-arg"); 608 argv.push_back(Runtime::Current()->GetClassPathString()); 609 610 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 611 612 if (!Runtime::Current()->IsVerificationEnabled()) { 613 argv.push_back("--compiler-filter=verify-none"); 614 } 615 616 if (Runtime::Current()->MustRelocateIfPossible()) { 617 argv.push_back("--runtime-arg"); 618 argv.push_back("-Xrelocate"); 619 } else { 620 argv.push_back("--runtime-arg"); 621 argv.push_back("-Xnorelocate"); 622 } 623 624 if (!kIsTargetBuild) { 625 argv.push_back("--host"); 626 } 627 628 argv.push_back(boot_image_option); 629 argv.push_back(dex_file_option); 630 argv.push_back(oat_fd_option); 631 argv.push_back(oat_location_option); 632 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 633 for (size_t i = 0; i < compiler_options.size(); ++i) { 634 argv.push_back(compiler_options[i].c_str()); 635 } 636 637 return Exec(argv, error_msg); 638} 639 640const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 641 WriterMutexLock mu(Thread::Current(), dex_lock_); 642 if (kIsDebugBuild) { 643 for (size_t i = 0; i < oat_files_.size(); ++i) { 644 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 645 } 646 } 647 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 648 oat_files_.push_back(oat_file); 649 return oat_file; 650} 651 652OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 653 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 654 OatFile* oat_file = space->ReleaseOatFile(); 655 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 656 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 657 return *oat_file; 658} 659 660const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 661 const char* dex_location = dex_file.GetLocation().c_str(); 662 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 663 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 664} 665 666const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 667 const uint32_t* const dex_location_checksum) { 668 ReaderMutexLock mu(Thread::Current(), dex_lock_); 669 for (size_t i = 0; i < oat_files_.size(); i++) { 670 const OatFile* oat_file = oat_files_[i]; 671 DCHECK(oat_file != NULL); 672 673 if (oat_location != nullptr) { 674 if (oat_file->GetLocation() != oat_location) { 675 continue; 676 } 677 } 678 679 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 680 dex_location_checksum, 681 false); 682 if (oat_dex_file != NULL) { 683 return oat_file; 684 } 685 } 686 return NULL; 687} 688 689static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 690 bool generated, 691 std::vector<std::string>* error_msgs, 692 std::vector<const DexFile*>* dex_files) { 693 if (oat_file == nullptr) { 694 return false; 695 } 696 697 size_t old_size = dex_files->size(); // To rollback on error. 698 699 bool success = true; 700 for (size_t i = 0; success; ++i) { 701 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 702 const char* next_name = next_name_str.c_str(); 703 704 uint32_t dex_location_checksum; 705 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 706 std::string error_msg; 707 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 708 DCHECK_EQ(false, i == 0 && generated); 709 dex_location_checksum_pointer = nullptr; 710 } 711 712 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 713 714 if (oat_dex_file == nullptr) { 715 if (i == 0 && generated) { 716 std::string error_msg; 717 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 718 " file'%s'", dex_location, dex_location_checksum, 719 oat_file->GetLocation().c_str()); 720 error_msgs->push_back(error_msg); 721 } 722 break; // Not found, done. 723 } 724 725 // Checksum test. Test must succeed when generated. 726 success = !generated; 727 if (dex_location_checksum_pointer != nullptr) { 728 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 729 } 730 731 if (success) { 732 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 733 if (dex_file == nullptr) { 734 success = false; 735 error_msgs->push_back(error_msg); 736 } else { 737 dex_files->push_back(dex_file); 738 } 739 } 740 741 // When we generated the file, we expect success, or something is terribly wrong. 742 CHECK_EQ(false, generated && !success) 743 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 744 << std::hex << " dex_location_checksum=" << dex_location_checksum 745 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 746 } 747 748 if (dex_files->size() == old_size) { 749 success = false; // We did not even find classes.dex 750 } 751 752 if (success) { 753 return true; 754 } else { 755 // Free all the dex files we have loaded. 756 auto it = dex_files->begin() + old_size; 757 auto it_end = dex_files->end(); 758 for (; it != it_end; it++) { 759 delete *it; 760 } 761 dex_files->erase(dex_files->begin() + old_size, it_end); 762 763 return false; 764 } 765} 766 767// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 768// complicates the loading process, as we should not use an iterative loading process, because that 769// would register the oat file and dex files that come before the broken one. Instead, check all 770// multidex ahead of time. 771bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 772 std::vector<std::string>* error_msgs, 773 std::vector<const DexFile*>* dex_files) { 774 // 1) Check whether we have an open oat file. 775 // This requires a dex checksum, use the "primary" one. 776 uint32_t dex_location_checksum; 777 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 778 bool have_checksum = true; 779 std::string checksum_error_msg; 780 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 781 dex_location_checksum_pointer = nullptr; 782 have_checksum = false; 783 } 784 785 bool needs_registering = false; 786 787 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 788 dex_location_checksum_pointer)); 789 790 // 2) If we do not have an open one, maybe there's one on disk already. 791 792 // In case the oat file is not open, we play a locking game here so 793 // that if two different processes race to load and register or generate 794 // (or worse, one tries to open a partial generated file) we will be okay. 795 // This is actually common with apps that use DexClassLoader to work 796 // around the dex method reference limit and that have a background 797 // service running in a separate process. 798 ScopedFlock scoped_flock; 799 800 if (open_oat_file.get() == nullptr) { 801 if (oat_location != nullptr) { 802 // Can only do this if we have a checksum, else error. 803 if (!have_checksum) { 804 error_msgs->push_back(checksum_error_msg); 805 return false; 806 } 807 808 std::string error_msg; 809 810 // We are loading or creating one in the future. Time to set up the file lock. 811 if (!scoped_flock.Init(oat_location, &error_msg)) { 812 error_msgs->push_back(error_msg); 813 return false; 814 } 815 816 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 817 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 818 oat_location, &error_msg)); 819 820 if (open_oat_file.get() == nullptr) { 821 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 822 dex_location, oat_location, error_msg.c_str()); 823 VLOG(class_linker) << compound_msg; 824 error_msgs->push_back(compound_msg); 825 } 826 } else { 827 // TODO: What to lock here? 828 bool obsolete_file_cleanup_failed; 829 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 830 dex_location_checksum_pointer, 831 kRuntimeISA, error_msgs, 832 &obsolete_file_cleanup_failed)); 833 // There's no point in going forward and eventually try to regenerate the 834 // file if we couldn't remove the obsolete one. Mostly likely we will fail 835 // with the same error when trying to write the new file. 836 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 837 if (obsolete_file_cleanup_failed) { 838 return false; 839 } 840 } 841 needs_registering = true; 842 } 843 844 // 3) If we have an oat file, check all contained multidex files for our dex_location. 845 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 846 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 847 dex_files); 848 if (success) { 849 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 850 if (needs_registering) { 851 // We opened the oat file, so we must register it. 852 RegisterOatFile(oat_file); 853 } 854 return true; 855 } else { 856 if (needs_registering) { 857 // We opened it, delete it. 858 open_oat_file.reset(); 859 } else { 860 open_oat_file.release(); // Do not delete open oat files. 861 } 862 } 863 864 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 865 866 // Need a checksum, fail else. 867 if (!have_checksum) { 868 error_msgs->push_back(checksum_error_msg); 869 return false; 870 } 871 872 // Look in cache location if no oat_location is given. 873 std::string cache_location; 874 if (oat_location == nullptr) { 875 // Use the dalvik cache. 876 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 877 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 878 oat_location = cache_location.c_str(); 879 } 880 881 // Definitely need to lock now. 882 if (!scoped_flock.HasFile()) { 883 std::string error_msg; 884 if (!scoped_flock.Init(oat_location, &error_msg)) { 885 error_msgs->push_back(error_msg); 886 return false; 887 } 888 } 889 890 if (Runtime::Current()->IsDex2OatEnabled()) { 891 // Create the oat file. 892 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 893 oat_location, error_msgs)); 894 } 895 896 // Failed, bail. 897 if (open_oat_file.get() == nullptr) { 898 std::string error_msg; 899 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 900 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 901 error_msgs->push_back(error_msg); 902 return false; 903 } 904 905 // Try to load again, but stronger checks. 906 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 907 dex_files); 908 if (success) { 909 RegisterOatFile(open_oat_file.release()); 910 return true; 911 } else { 912 return false; 913 } 914} 915 916const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 917 uint32_t dex_location_checksum, 918 const char* oat_location, 919 std::string* error_msg) { 920 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 921 !Runtime::Current()->IsCompiler(), 922 error_msg)); 923 if (oat_file.get() == nullptr) { 924 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 925 error_msg->c_str()); 926 return nullptr; 927 } 928 Runtime* runtime = Runtime::Current(); 929 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 930 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 931 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 932 if (expected_image_oat_checksum != actual_image_oat_checksum) { 933 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 934 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 935 actual_image_oat_checksum); 936 return nullptr; 937 } 938 939 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 940 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 941 if (expected_image_oat_offset != actual_image_oat_offset) { 942 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 943 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 944 actual_image_oat_offset); 945 return nullptr; 946 } 947 int32_t expected_patch_delta = image_header.GetPatchDelta(); 948 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 949 if (expected_patch_delta != actual_patch_delta) { 950 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 951 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 952 return nullptr; 953 } 954 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 955 &dex_location_checksum); 956 if (oat_dex_file == nullptr) { 957 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 958 dex_location); 959 return nullptr; 960 } 961 uint32_t expected_dex_checksum = dex_location_checksum; 962 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 963 if (expected_dex_checksum != actual_dex_checksum) { 964 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 965 "found 0x%x", oat_location, expected_dex_checksum, 966 actual_dex_checksum); 967 return nullptr; 968 } 969 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 970 if (dex_file.get() != nullptr) { 971 return oat_file.release(); 972 } else { 973 return nullptr; 974 } 975} 976 977const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 978 int fd, const char* oat_location, 979 std::vector<std::string>* error_msgs) { 980 // Generate the output oat file for the dex file 981 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 982 std::string error_msg; 983 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 984 CHECK(!error_msg.empty()); 985 error_msgs->push_back(error_msg); 986 return nullptr; 987 } 988 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 989 !Runtime::Current()->IsCompiler(), 990 &error_msg)); 991 if (oat_file.get() == nullptr) { 992 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 993 oat_location, error_msg.c_str()); 994 error_msgs->push_back(compound_msg); 995 return nullptr; 996 } 997 998 return oat_file.release(); 999} 1000 1001bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1002 const InstructionSet instruction_set) { 1003 Runtime* runtime = Runtime::Current(); 1004 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1005 uint32_t image_oat_checksum = 0; 1006 if (instruction_set == kRuntimeISA) { 1007 const ImageHeader& image_header = image_space->GetImageHeader(); 1008 image_oat_checksum = image_header.GetOatChecksum(); 1009 } else { 1010 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1011 image_space->GetImageLocation().c_str(), instruction_set)); 1012 image_oat_checksum = image_header->GetOatChecksum(); 1013 } 1014 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1015} 1016 1017bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1018 const InstructionSet instruction_set, 1019 std::string* error_msg) { 1020 Runtime* runtime = Runtime::Current(); 1021 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1022 1023 // If the requested instruction set is the same as the current runtime, 1024 // we can use the checksums directly. If it isn't, we'll have to read the 1025 // image header from the image for the right instruction set. 1026 uint32_t image_oat_checksum = 0; 1027 uintptr_t image_oat_data_begin = 0; 1028 int32_t image_patch_delta = 0; 1029 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1030 const ImageHeader& image_header = image_space->GetImageHeader(); 1031 image_oat_checksum = image_header.GetOatChecksum(); 1032 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1033 image_patch_delta = image_header.GetPatchDelta(); 1034 } else { 1035 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1036 image_space->GetImageLocation().c_str(), instruction_set)); 1037 image_oat_checksum = image_header->GetOatChecksum(); 1038 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1039 image_patch_delta = image_header->GetPatchDelta(); 1040 } 1041 const OatHeader& oat_header = oat_file->GetOatHeader(); 1042 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1043 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1044 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1045 if (!ret) { 1046 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1047 oat_file->GetLocation().c_str(), 1048 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1049 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1050 oat_file->GetOatHeader().GetImagePatchDelta(), 1051 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1052 } 1053 return ret; 1054} 1055 1056bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1057 const char* dex_location, 1058 uint32_t dex_location_checksum, 1059 const InstructionSet instruction_set, 1060 std::string* error_msg) { 1061 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1062 return false; 1063 } 1064 1065 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1066 &dex_location_checksum); 1067 if (oat_dex_file == NULL) { 1068 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1069 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1070 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1071 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1072 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1073 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1074 oat_file->GetLocation().c_str(), 1075 oat_dex_file->GetDexFileLocation().c_str()); 1076 } 1077 return false; 1078 } 1079 1080 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1081 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1082 oat_file->GetLocation().c_str(), 1083 oat_dex_file->GetDexFileLocationChecksum(), 1084 dex_location, dex_location_checksum); 1085 return false; 1086 } 1087 return true; 1088} 1089 1090bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1091 const char* dex_location, 1092 std::string* error_msg) { 1093 CHECK(oat_file != nullptr); 1094 CHECK(dex_location != nullptr); 1095 std::unique_ptr<const DexFile> dex_file; 1096 uint32_t dex_location_checksum; 1097 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1098 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1099 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1100 // directory. 1101 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1102 if (oat_dex_file == nullptr) { 1103 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1104 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1105 error_msg->c_str()); 1106 return false; 1107 } 1108 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1109 } else { 1110 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1111 kRuntimeISA, error_msg); 1112 if (!verified) { 1113 return false; 1114 } 1115 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1116 &dex_location_checksum)->OpenDexFile(error_msg)); 1117 } 1118 return dex_file.get() != nullptr; 1119} 1120 1121const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1122 const char* dex_location, 1123 const uint32_t* const dex_location_checksum, 1124 InstructionSet isa, 1125 std::vector<std::string>* error_msgs, 1126 bool* obsolete_file_cleanup_failed) { 1127 *obsolete_file_cleanup_failed = false; 1128 bool already_opened = false; 1129 std::string dex_location_str(dex_location); 1130 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1131 &already_opened, 1132 obsolete_file_cleanup_failed, 1133 error_msgs)); 1134 std::string error_msg; 1135 if (oat_file.get() == nullptr) { 1136 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1137 dex_location)); 1138 return nullptr; 1139 } else if (!VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1140 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1141 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1142 error_msg.c_str())); 1143 return nullptr; 1144 } else { 1145 return oat_file.release(); 1146 } 1147} 1148 1149const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1150 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1151 for (size_t i = 0; i < oat_files_.size(); i++) { 1152 const OatFile* oat_file = oat_files_[i]; 1153 DCHECK(oat_file != nullptr); 1154 if (oat_file->GetLocation() == oat_location) { 1155 return oat_file; 1156 } 1157 } 1158 return nullptr; 1159} 1160 1161const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1162 InstructionSet isa, 1163 bool *already_opened, 1164 bool *obsolete_file_cleanup_failed, 1165 std::vector<std::string>* error_msgs) { 1166 // Find out if we've already opened the file 1167 const OatFile* ret = nullptr; 1168 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1169 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1170 if (ret != nullptr) { 1171 *already_opened = true; 1172 return ret; 1173 } 1174 1175 std::string dalvik_cache; 1176 bool have_android_data = false; 1177 bool have_dalvik_cache = false; 1178 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1179 &have_android_data, &have_dalvik_cache); 1180 std::string cache_filename; 1181 if (have_dalvik_cache) { 1182 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1183 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1184 if (ret != nullptr) { 1185 *already_opened = true; 1186 return ret; 1187 } 1188 } else { 1189 // If we need to relocate we should just place odex back where it started. 1190 cache_filename = odex_filename; 1191 } 1192 1193 ret = nullptr; 1194 1195 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1196 // 1197 // Now we do the following: 1198 // 1) Try and open the odex version 1199 // 2) If present, checksum-verified & relocated correctly return it 1200 // 3) Close the odex version to free up its address space. 1201 // 4) Try and open the cache version 1202 // 5) If present, checksum-verified & relocated correctly return it 1203 // 6) Close the cache version to free up its address space. 1204 // 7) If we should relocate: 1205 // a) If we have opened and checksum-verified the odex version relocate it to 1206 // 'cache_filename' and return it 1207 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1208 // it. This should not happen often (I think only the run-test's will hit this case). 1209 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1210 // this point. 1211 // 9) Return nullptr 1212 1213 *already_opened = false; 1214 const Runtime* runtime = Runtime::Current(); 1215 CHECK(runtime != nullptr); 1216 bool executable = !runtime->IsCompiler(); 1217 1218 std::string odex_error_msg; 1219 bool should_patch_system = false; 1220 bool odex_checksum_verified = false; 1221 { 1222 // There is a high probability that these both these oat files map similar/the same address 1223 // spaces so we must scope them like this so they each gets its turn. 1224 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1225 executable, &odex_error_msg)); 1226 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1227 &odex_checksum_verified, 1228 &odex_error_msg)) { 1229 error_msgs->push_back(odex_error_msg); 1230 return odex_oat_file.release(); 1231 } else if (odex_checksum_verified) { 1232 // We can just relocate 1233 should_patch_system = true; 1234 odex_error_msg = "Image Patches are incorrect"; 1235 } 1236 } 1237 1238 1239 std::string cache_error_msg; 1240 bool should_patch_cache = false; 1241 bool cache_checksum_verified = false; 1242 if (have_dalvik_cache) { 1243 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1244 executable, &cache_error_msg)); 1245 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1246 &cache_checksum_verified, 1247 &cache_error_msg)) { 1248 error_msgs->push_back(cache_error_msg); 1249 return cache_oat_file.release(); 1250 } else if (cache_checksum_verified) { 1251 // We can just relocate 1252 should_patch_cache = true; 1253 cache_error_msg = "Image Patches are incorrect"; 1254 } 1255 } else if (have_android_data) { 1256 // dalvik_cache does not exist but android data does. This means we should be able to create 1257 // it, so we should try. 1258 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1259 } 1260 1261 ret = nullptr; 1262 std::string error_msg; 1263 if (runtime->CanRelocate()) { 1264 // Run relocation 1265 const std::string& image_location = 1266 Runtime::Current()->GetHeap()->GetImageSpace()->GetImageLocation(); 1267 if (odex_checksum_verified && should_patch_system) { 1268 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1269 } else if (cache_checksum_verified && should_patch_cache) { 1270 CHECK(have_dalvik_cache); 1271 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1272 } 1273 } 1274 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1275 // implicitly: were able to fine where the cached version is but we were unable to use it, 1276 // either as a destination for relocation or to open a file. We should delete it if it is 1277 // there. 1278 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1279 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1280 "searching for dex file %s: %s", 1281 cache_filename.c_str(), dex_location.c_str(), 1282 strerror(errno)); 1283 error_msgs->push_back(rm_error_msg); 1284 VLOG(class_linker) << rm_error_msg; 1285 // Let the caller know that we couldn't remove the obsolete file. 1286 // This is a good indication that further writes may fail as well. 1287 *obsolete_file_cleanup_failed = true; 1288 } 1289 } 1290 if (ret == nullptr) { 1291 VLOG(class_linker) << error_msg; 1292 error_msgs->push_back(error_msg); 1293 std::string relocation_msg; 1294 if (runtime->CanRelocate()) { 1295 relocation_msg = StringPrintf(" and relocation failed"); 1296 } 1297 if (have_dalvik_cache && cache_checksum_verified) { 1298 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1299 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1300 cache_filename.c_str(), cache_error_msg.c_str(), 1301 relocation_msg.c_str()); 1302 } else { 1303 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1304 "dalvik_cache availible)%s.", odex_filename.c_str(), 1305 odex_error_msg.c_str(), relocation_msg.c_str()); 1306 } 1307 VLOG(class_linker) << error_msg; 1308 error_msgs->push_back(error_msg); 1309 } 1310 return ret; 1311} 1312 1313const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1314 const std::string& output_oat, 1315 const std::string& image_location, 1316 InstructionSet isa, 1317 std::string* error_msg) { 1318 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1319 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1320 1321 std::string isa_arg("--instruction-set="); 1322 isa_arg += GetInstructionSetString(isa); 1323 std::string input_oat_filename_arg("--input-oat-file="); 1324 input_oat_filename_arg += input_oat; 1325 std::string output_oat_filename_arg("--output-oat-file="); 1326 output_oat_filename_arg += output_oat; 1327 std::string patched_image_arg("--patched-image-location="); 1328 patched_image_arg += image_location; 1329 1330 std::vector<std::string> argv; 1331 argv.push_back(patchoat); 1332 argv.push_back(isa_arg); 1333 argv.push_back(input_oat_filename_arg); 1334 argv.push_back(output_oat_filename_arg); 1335 argv.push_back(patched_image_arg); 1336 1337 std::string command_line(Join(argv, ' ')); 1338 LOG(INFO) << "Relocate Oat File: " << command_line; 1339 bool success = Exec(argv, error_msg); 1340 if (success) { 1341 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1342 !Runtime::Current()->IsCompiler(), error_msg)); 1343 bool checksum_verified = false; 1344 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1345 return output.release(); 1346 } else if (output.get() != nullptr) { 1347 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1348 "but output file '%s' failed verifcation: %s", 1349 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1350 } else { 1351 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1352 "but was unable to open output file '%s': %s", 1353 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1354 } 1355 } else { 1356 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1357 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1358 error_msg->c_str()); 1359 } 1360 return nullptr; 1361} 1362 1363int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1364 Runtime* runtime = Runtime::Current(); 1365 int32_t real_patch_delta; 1366 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1367 if (isa == Runtime::Current()->GetInstructionSet()) { 1368 const ImageHeader& image_header = image_space->GetImageHeader(); 1369 real_patch_delta = image_header.GetPatchDelta(); 1370 } else { 1371 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1372 image_space->GetImageLocation().c_str(), isa)); 1373 real_patch_delta = image_header->GetPatchDelta(); 1374 } 1375 const OatHeader& oat_header = oat_file->GetOatHeader(); 1376 return real_patch_delta - oat_header.GetImagePatchDelta(); 1377} 1378 1379bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1380 bool* checksum_verified, 1381 std::string* error_msg) { 1382 std::string compound_msg("Oat file failed to verify: "); 1383 Runtime* runtime = Runtime::Current(); 1384 uint32_t real_image_checksum; 1385 void* real_image_oat_offset; 1386 int32_t real_patch_delta; 1387 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1388 if (isa == Runtime::Current()->GetInstructionSet()) { 1389 const ImageHeader& image_header = image_space->GetImageHeader(); 1390 real_image_checksum = image_header.GetOatChecksum(); 1391 real_image_oat_offset = image_header.GetOatDataBegin(); 1392 real_patch_delta = image_header.GetPatchDelta(); 1393 } else { 1394 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1395 image_space->GetImageLocation().c_str(), isa)); 1396 real_image_checksum = image_header->GetOatChecksum(); 1397 real_image_oat_offset = image_header->GetOatDataBegin(); 1398 real_patch_delta = image_header->GetPatchDelta(); 1399 } 1400 1401 const OatHeader& oat_header = oat_file->GetOatHeader(); 1402 1403 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1404 *checksum_verified = oat_image_checksum == real_image_checksum; 1405 if (!*checksum_verified) { 1406 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1407 real_image_checksum, oat_image_checksum); 1408 } 1409 1410 void* oat_image_oat_offset = 1411 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1412 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1413 if (!offset_verified) { 1414 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1415 real_image_oat_offset, oat_image_oat_offset); 1416 } 1417 1418 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1419 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1420 if (!patch_delta_verified) { 1421 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1422 real_patch_delta, oat_patch_delta); 1423 } 1424 1425 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1426 if (ret) { 1427 *error_msg = compound_msg; 1428 } 1429 return ret; 1430} 1431 1432const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1433 std::string* error_msg) { 1434 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1435 if (oat_file != nullptr) { 1436 return oat_file; 1437 } 1438 1439 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1440 error_msg); 1441 if (oat_file == NULL) { 1442 return NULL; 1443 } 1444 return oat_file; 1445} 1446 1447static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1448 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1449 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1450 1451 DCHECK(obj != NULL); 1452 DCHECK(class_linker != NULL); 1453 1454 if (obj->IsArtMethod()) { 1455 mirror::ArtMethod* method = obj->AsArtMethod(); 1456 if (!method->IsNative()) { 1457 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1458 if (method != Runtime::Current()->GetResolutionMethod()) { 1459 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1460 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1461 } 1462 } 1463 } 1464} 1465 1466void ClassLinker::InitFromImage() { 1467 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1468 CHECK(!init_done_); 1469 1470 Thread* self = Thread::Current(); 1471 gc::Heap* heap = Runtime::Current()->GetHeap(); 1472 gc::space::ImageSpace* space = heap->GetImageSpace(); 1473 dex_cache_image_class_lookup_required_ = true; 1474 CHECK(space != NULL); 1475 OatFile& oat_file = GetImageOatFile(space); 1476 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1477 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1478 const char* image_file_location = oat_file.GetOatHeader(). 1479 GetStoreValueByKey(OatHeader::kImageLocationKey); 1480 CHECK(image_file_location == nullptr || *image_file_location == 0); 1481 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1482 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1483 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1484 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1485 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1486 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1487 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1488 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1489 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1490 1491 StackHandleScope<1> hs(self); 1492 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1493 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1494 AsObjectArray<mirror::Class>())); 1495 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1496 1497 // Special case of setting up the String class early so that we can test arbitrary objects 1498 // as being Strings or not 1499 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1500 1501 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1502 static_cast<uint32_t>(dex_caches->GetLength())); 1503 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1504 StackHandleScope<1> hs(self); 1505 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1506 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1507 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1508 nullptr); 1509 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1510 std::string error_msg; 1511 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1512 if (dex_file == NULL) { 1513 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1514 << " from within oat file " << oat_file.GetLocation() 1515 << " error '" << error_msg << "'"; 1516 } 1517 1518 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1519 1520 AppendToBootClassPath(*dex_file, dex_cache); 1521 } 1522 1523 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1524 // bitmap walk. 1525 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1526 1527 // Set entry point to interpreter if in InterpretOnly mode. 1528 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1529 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1530 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1531 } 1532 1533 // reinit class_roots_ 1534 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1535 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1536 1537 // reinit array_iftable_ from any array class instance, they should be == 1538 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1539 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1540 // String class root was set above 1541 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1542 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1543 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1544 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1545 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1546 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1547 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1548 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1549 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1550 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1551 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1552 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1553 1554 FinishInit(self); 1555 1556 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1557} 1558 1559void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1560 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1561 if ((flags & kVisitRootFlagAllRoots) != 0) { 1562 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1563 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1564 } 1565 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1566 for (auto& pair : new_class_roots_) { 1567 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1568 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1569 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1570 if (UNLIKELY(new_ref != old_ref)) { 1571 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1572 // corresponding object. This is slow, but luckily for us, this may only happen with a 1573 // concurrent moving GC. 1574 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1575 it != end && it->first == pair.first; ++it) { 1576 // If the class stored matches the old class, update it to the new value. 1577 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1578 it->second = GcRoot<mirror::Class>(new_ref); 1579 } 1580 } 1581 } 1582 } 1583 } 1584 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1585 new_class_roots_.clear(); 1586 } 1587 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1588 log_new_class_table_roots_ = true; 1589 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1590 log_new_class_table_roots_ = false; 1591 } 1592 // We deliberately ignore the class roots in the image since we 1593 // handle image roots by using the MS/CMS rescanning of dirty cards. 1594} 1595 1596// Keep in sync with InitCallback. Anything we visit, we need to 1597// reinit references to when reinitializing a ClassLinker from a 1598// mapped image. 1599void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1600 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1601 Thread* self = Thread::Current(); 1602 { 1603 ReaderMutexLock mu(self, dex_lock_); 1604 if ((flags & kVisitRootFlagAllRoots) != 0) { 1605 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1606 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1607 } 1608 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1609 for (size_t index : new_dex_cache_roots_) { 1610 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1611 } 1612 } 1613 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1614 new_dex_cache_roots_.clear(); 1615 } 1616 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1617 log_new_dex_caches_roots_ = true; 1618 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1619 log_new_dex_caches_roots_ = false; 1620 } 1621 } 1622 VisitClassRoots(callback, arg, flags); 1623 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1624 DCHECK(!array_iftable_.IsNull()); 1625 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1626 if (!find_array_class_cache_[i].IsNull()) { 1627 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1628 } 1629 } 1630} 1631 1632void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1633 if (dex_cache_image_class_lookup_required_) { 1634 MoveImageClassesToClassTable(); 1635 } 1636 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1637 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1638 mirror::Class* c = it.second.Read(); 1639 if (!visitor(c, arg)) { 1640 return; 1641 } 1642 } 1643} 1644 1645static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1646 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1647 classes->insert(c); 1648 return true; 1649} 1650 1651void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1652 std::set<mirror::Class*> classes; 1653 VisitClasses(GetClassesVisitor, &classes); 1654 for (mirror::Class* klass : classes) { 1655 if (!visitor(klass, arg)) { 1656 return; 1657 } 1658 } 1659} 1660 1661ClassLinker::~ClassLinker() { 1662 mirror::Class::ResetClass(); 1663 mirror::String::ResetClass(); 1664 mirror::Reference::ResetClass(); 1665 mirror::ArtField::ResetClass(); 1666 mirror::ArtMethod::ResetClass(); 1667 mirror::BooleanArray::ResetArrayClass(); 1668 mirror::ByteArray::ResetArrayClass(); 1669 mirror::CharArray::ResetArrayClass(); 1670 mirror::DoubleArray::ResetArrayClass(); 1671 mirror::FloatArray::ResetArrayClass(); 1672 mirror::IntArray::ResetArrayClass(); 1673 mirror::LongArray::ResetArrayClass(); 1674 mirror::ShortArray::ResetArrayClass(); 1675 mirror::Throwable::ResetClass(); 1676 mirror::StackTraceElement::ResetClass(); 1677 STLDeleteElements(&boot_class_path_); 1678 STLDeleteElements(&oat_files_); 1679} 1680 1681mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1682 gc::Heap* heap = Runtime::Current()->GetHeap(); 1683 StackHandleScope<16> hs(self); 1684 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1685 Handle<mirror::DexCache> dex_cache( 1686 hs.NewHandle(down_cast<mirror::DexCache*>( 1687 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1688 VoidFunctor())))); 1689 if (dex_cache.Get() == NULL) { 1690 return NULL; 1691 } 1692 Handle<mirror::String> 1693 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1694 if (location.Get() == NULL) { 1695 return NULL; 1696 } 1697 Handle<mirror::ObjectArray<mirror::String>> 1698 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1699 if (strings.Get() == NULL) { 1700 return NULL; 1701 } 1702 Handle<mirror::ObjectArray<mirror::Class>> 1703 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1704 if (types.Get() == NULL) { 1705 return NULL; 1706 } 1707 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1708 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1709 if (methods.Get() == NULL) { 1710 return NULL; 1711 } 1712 Handle<mirror::ObjectArray<mirror::ArtField>> 1713 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1714 if (fields.Get() == NULL) { 1715 return NULL; 1716 } 1717 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1718 fields.Get()); 1719 return dex_cache.Get(); 1720} 1721 1722mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1723 uint32_t class_size) { 1724 DCHECK_GE(class_size, sizeof(mirror::Class)); 1725 gc::Heap* heap = Runtime::Current()->GetHeap(); 1726 mirror::Class::InitializeClassVisitor visitor(class_size); 1727 mirror::Object* k = kMovingClasses ? 1728 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1729 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1730 if (UNLIKELY(k == nullptr)) { 1731 CHECK(self->IsExceptionPending()); // OOME. 1732 return nullptr; 1733 } 1734 return k->AsClass(); 1735} 1736 1737mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1738 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1739} 1740 1741mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1742 return down_cast<mirror::ArtField*>( 1743 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1744} 1745 1746mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1747 return down_cast<mirror::ArtMethod*>( 1748 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1749} 1750 1751mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1752 Thread* self, size_t length) { 1753 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1754 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1755} 1756 1757mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1758 mirror::Class* klass) { 1759 DCHECK(klass != NULL); 1760 1761 // For temporary classes we must wait for them to be retired. 1762 if (init_done_ && klass->IsTemp()) { 1763 CHECK(!klass->IsResolved()); 1764 if (klass->IsErroneous()) { 1765 ThrowEarlierClassFailure(klass); 1766 return nullptr; 1767 } 1768 StackHandleScope<1> hs(self); 1769 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1770 ObjectLock<mirror::Class> lock(self, h_class); 1771 // Loop and wait for the resolving thread to retire this class. 1772 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1773 lock.WaitIgnoringInterrupts(); 1774 } 1775 if (h_class->IsErroneous()) { 1776 ThrowEarlierClassFailure(h_class.Get()); 1777 return nullptr; 1778 } 1779 CHECK(h_class->IsRetired()); 1780 // Get the updated class from class table. 1781 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1782 } 1783 1784 // Wait for the class if it has not already been linked. 1785 if (!klass->IsResolved() && !klass->IsErroneous()) { 1786 StackHandleScope<1> hs(self); 1787 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1788 ObjectLock<mirror::Class> lock(self, h_class); 1789 // Check for circular dependencies between classes. 1790 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1791 ThrowClassCircularityError(h_class.Get()); 1792 h_class->SetStatus(mirror::Class::kStatusError, self); 1793 return nullptr; 1794 } 1795 // Wait for the pending initialization to complete. 1796 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1797 lock.WaitIgnoringInterrupts(); 1798 } 1799 } 1800 1801 if (klass->IsErroneous()) { 1802 ThrowEarlierClassFailure(klass); 1803 return nullptr; 1804 } 1805 // Return the loaded class. No exceptions should be pending. 1806 CHECK(klass->IsResolved()) << PrettyClass(klass); 1807 self->AssertNoPendingException(); 1808 return klass; 1809} 1810 1811mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1812 Handle<mirror::ClassLoader> class_loader) { 1813 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1814 DCHECK(self != nullptr); 1815 self->AssertNoPendingException(); 1816 if (descriptor[1] == '\0') { 1817 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1818 // for primitive classes that aren't backed by dex files. 1819 return FindPrimitiveClass(descriptor[0]); 1820 } 1821 // Find the class in the loaded classes table. 1822 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1823 if (klass != NULL) { 1824 return EnsureResolved(self, descriptor, klass); 1825 } 1826 // Class is not yet loaded. 1827 if (descriptor[0] == '[') { 1828 return CreateArrayClass(self, descriptor, class_loader); 1829 } else if (class_loader.Get() == nullptr) { 1830 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1831 if (pair.second != NULL) { 1832 StackHandleScope<1> hs(self); 1833 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1834 } 1835 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1836 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1837 // throw of a NoClassDefFoundError. 1838 if (IsInBootClassPath(descriptor)) { 1839 mirror::Class* system_class = FindSystemClass(self, descriptor); 1840 CHECK(system_class != NULL); 1841 return system_class; 1842 } 1843 // Next try the compile time class path. 1844 const std::vector<const DexFile*>* class_path; 1845 { 1846 ScopedObjectAccessUnchecked soa(self); 1847 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1848 soa.AddLocalReference<jobject>(class_loader.Get())); 1849 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1850 } 1851 1852 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1853 if (pair.second != NULL) { 1854 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1855 } 1856 1857 } else { 1858 ScopedObjectAccessUnchecked soa(self); 1859 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1860 soa.AddLocalReference<jobject>(class_loader.Get())); 1861 std::string class_name_string(DescriptorToDot(descriptor)); 1862 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1863 { 1864 ScopedThreadStateChange tsc(self, kNative); 1865 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1866 soa.Env()->NewStringUTF(class_name_string.c_str())); 1867 if (class_name_object.get() == NULL) { 1868 return NULL; 1869 } 1870 CHECK(class_loader_object.get() != NULL); 1871 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1872 WellKnownClasses::java_lang_ClassLoader_loadClass, 1873 class_name_object.get())); 1874 } 1875 if (self->IsExceptionPending()) { 1876 // If the ClassLoader threw, pass that exception up. 1877 return NULL; 1878 } else if (result.get() == NULL) { 1879 // broken loader - throw NPE to be compatible with Dalvik 1880 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1881 class_name_string.c_str()).c_str()); 1882 return NULL; 1883 } else { 1884 // success, return mirror::Class* 1885 return soa.Decode<mirror::Class*>(result.get()); 1886 } 1887 } 1888 1889 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1890 return NULL; 1891} 1892 1893mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1894 Handle<mirror::ClassLoader> class_loader, 1895 const DexFile& dex_file, 1896 const DexFile::ClassDef& dex_class_def) { 1897 Thread* self = Thread::Current(); 1898 StackHandleScope<3> hs(self); 1899 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1900 bool should_allocate = false; 1901 1902 // Load the class from the dex file. 1903 if (UNLIKELY(!init_done_)) { 1904 // finish up init of hand crafted class_roots_ 1905 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1906 klass.Assign(GetClassRoot(kJavaLangObject)); 1907 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1908 klass.Assign(GetClassRoot(kJavaLangClass)); 1909 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1910 klass.Assign(GetClassRoot(kJavaLangString)); 1911 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1912 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1913 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1914 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1915 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1916 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1917 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1918 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1919 } else { 1920 should_allocate = true; 1921 } 1922 } else { 1923 should_allocate = true; 1924 } 1925 1926 if (should_allocate) { 1927 // Allocate a class with the status of not ready. 1928 // Interface object should get the right size here. Regular class will 1929 // figure out the right size later and be replaced with one of the right 1930 // size when the class becomes resolved. 1931 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1932 } 1933 if (UNLIKELY(klass.Get() == nullptr)) { 1934 CHECK(self->IsExceptionPending()); // Expect an OOME. 1935 return nullptr; 1936 } 1937 klass->SetDexCache(FindDexCache(dex_file)); 1938 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1939 ObjectLock<mirror::Class> lock(self, klass); 1940 if (self->IsExceptionPending()) { 1941 // An exception occured during load, set status to erroneous while holding klass' lock in case 1942 // notification is necessary. 1943 if (!klass->IsErroneous()) { 1944 klass->SetStatus(mirror::Class::kStatusError, self); 1945 } 1946 return nullptr; 1947 } 1948 klass->SetClinitThreadId(self->GetTid()); 1949 1950 // Add the newly loaded class to the loaded classes table. 1951 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1952 if (existing != nullptr) { 1953 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1954 // this thread to block. 1955 return EnsureResolved(self, descriptor, existing); 1956 } 1957 1958 // Finish loading (if necessary) by finding parents 1959 CHECK(!klass->IsLoaded()); 1960 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1961 // Loading failed. 1962 if (!klass->IsErroneous()) { 1963 klass->SetStatus(mirror::Class::kStatusError, self); 1964 } 1965 return nullptr; 1966 } 1967 CHECK(klass->IsLoaded()); 1968 // Link the class (if necessary) 1969 CHECK(!klass->IsResolved()); 1970 // TODO: Use fast jobjects? 1971 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1972 1973 mirror::Class* new_class = nullptr; 1974 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1975 // Linking failed. 1976 if (!klass->IsErroneous()) { 1977 klass->SetStatus(mirror::Class::kStatusError, self); 1978 } 1979 return nullptr; 1980 } 1981 CHECK(new_class != nullptr) << descriptor; 1982 CHECK(new_class->IsResolved()) << descriptor; 1983 1984 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1985 1986 /* 1987 * We send CLASS_PREPARE events to the debugger from here. The 1988 * definition of "preparation" is creating the static fields for a 1989 * class and initializing them to the standard default values, but not 1990 * executing any code (that comes later, during "initialization"). 1991 * 1992 * We did the static preparation in LinkClass. 1993 * 1994 * The class has been prepared and resolved but possibly not yet verified 1995 * at this point. 1996 */ 1997 Dbg::PostClassPrepare(new_class_h.Get()); 1998 1999 return new_class_h.Get(); 2000} 2001 2002uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2003 const DexFile::ClassDef& dex_class_def) { 2004 const byte* class_data = dex_file.GetClassData(dex_class_def); 2005 size_t num_ref = 0; 2006 size_t num_32 = 0; 2007 size_t num_64 = 0; 2008 if (class_data != NULL) { 2009 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2010 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2011 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2012 char c = descriptor[0]; 2013 if (c == 'L' || c == '[') { 2014 num_ref++; 2015 } else if (c == 'J' || c == 'D') { 2016 num_64++; 2017 } else { 2018 num_32++; 2019 } 2020 } 2021 } 2022 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2023} 2024 2025bool ClassLinker::FindOatClass(const DexFile& dex_file, 2026 uint16_t class_def_idx, 2027 OatFile::OatClass* oat_class) { 2028 DCHECK(oat_class != nullptr); 2029 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2030 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2031 if (oat_file == nullptr) { 2032 return false; 2033 } 2034 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2035 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2036 &dex_location_checksum); 2037 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2038 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2039 return true; 2040} 2041 2042static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2043 uint32_t method_idx) { 2044 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2045 const byte* class_data = dex_file.GetClassData(class_def); 2046 CHECK(class_data != NULL); 2047 ClassDataItemIterator it(dex_file, class_data); 2048 // Skip fields 2049 while (it.HasNextStaticField()) { 2050 it.Next(); 2051 } 2052 while (it.HasNextInstanceField()) { 2053 it.Next(); 2054 } 2055 // Process methods 2056 size_t class_def_method_index = 0; 2057 while (it.HasNextDirectMethod()) { 2058 if (it.GetMemberIndex() == method_idx) { 2059 return class_def_method_index; 2060 } 2061 class_def_method_index++; 2062 it.Next(); 2063 } 2064 while (it.HasNextVirtualMethod()) { 2065 if (it.GetMemberIndex() == method_idx) { 2066 return class_def_method_index; 2067 } 2068 class_def_method_index++; 2069 it.Next(); 2070 } 2071 DCHECK(!it.HasNext()); 2072 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2073 return 0; 2074} 2075 2076bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2077 DCHECK(oat_method != nullptr); 2078 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2079 // method for direct methods (or virtual methods made direct). 2080 mirror::Class* declaring_class = method->GetDeclaringClass(); 2081 size_t oat_method_index; 2082 if (method->IsStatic() || method->IsDirect()) { 2083 // Simple case where the oat method index was stashed at load time. 2084 oat_method_index = method->GetMethodIndex(); 2085 } else { 2086 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2087 // by search for its position in the declared virtual methods. 2088 oat_method_index = declaring_class->NumDirectMethods(); 2089 size_t end = declaring_class->NumVirtualMethods(); 2090 bool found = false; 2091 for (size_t i = 0; i < end; i++) { 2092 if (declaring_class->GetVirtualMethod(i) == method) { 2093 found = true; 2094 break; 2095 } 2096 oat_method_index++; 2097 } 2098 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2099 } 2100 DCHECK_EQ(oat_method_index, 2101 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2102 method->GetDeclaringClass()->GetDexClassDefIndex(), 2103 method->GetDexMethodIndex())); 2104 OatFile::OatClass oat_class; 2105 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2106 declaring_class->GetDexClassDefIndex(), 2107 &oat_class)) { 2108 return false; 2109 } 2110 2111 *oat_method = oat_class.GetOatMethod(oat_method_index); 2112 return true; 2113} 2114 2115// Special case to get oat code without overwriting a trampoline. 2116const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2117 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2118 if (method->IsProxyMethod()) { 2119 return GetQuickProxyInvokeHandler(); 2120 } 2121 OatFile::OatMethod oat_method; 2122 const void* result = nullptr; 2123 if (FindOatMethodFor(method, &oat_method)) { 2124 result = oat_method.GetQuickCode(); 2125 } 2126 2127 if (result == nullptr) { 2128 if (method->IsNative()) { 2129 // No code and native? Use generic trampoline. 2130 result = GetQuickGenericJniTrampoline(); 2131 } else if (method->IsPortableCompiled()) { 2132 // No code? Do we expect portable code? 2133 result = GetQuickToPortableBridge(); 2134 } else { 2135 // No code? You must mean to go into the interpreter. 2136 result = GetQuickToInterpreterBridge(); 2137 } 2138 } 2139 return result; 2140} 2141 2142const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2143 bool* have_portable_code) { 2144 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2145 *have_portable_code = false; 2146 if (method->IsProxyMethod()) { 2147 return GetPortableProxyInvokeHandler(); 2148 } 2149 OatFile::OatMethod oat_method; 2150 const void* result = nullptr; 2151 const void* quick_code = nullptr; 2152 if (FindOatMethodFor(method, &oat_method)) { 2153 result = oat_method.GetPortableCode(); 2154 quick_code = oat_method.GetQuickCode(); 2155 } 2156 2157 if (result == nullptr) { 2158 if (quick_code == nullptr) { 2159 // No code? You must mean to go into the interpreter. 2160 result = GetPortableToInterpreterBridge(); 2161 } else { 2162 // No code? But there's quick code, so use a bridge. 2163 result = GetPortableToQuickBridge(); 2164 } 2165 } else { 2166 *have_portable_code = true; 2167 } 2168 return result; 2169} 2170 2171const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2172 uint32_t method_idx) { 2173 OatFile::OatClass oat_class; 2174 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2175 return nullptr; 2176 } 2177 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2178 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2179} 2180 2181const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2182 uint32_t method_idx) { 2183 OatFile::OatClass oat_class; 2184 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2185 return nullptr; 2186 } 2187 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2188 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2189} 2190 2191// Returns true if the method must run with interpreter, false otherwise. 2192static bool NeedsInterpreter( 2193 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2194 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2195 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2196 // No code: need interpreter. 2197 // May return true for native code, in the case of generic JNI 2198 // DCHECK(!method->IsNative()); 2199 return true; 2200 } 2201#ifdef ART_SEA_IR_MODE 2202 ScopedObjectAccess soa(Thread::Current()); 2203 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2204 LOG(INFO) << "Found " << PrettyMethod(method); 2205 return false; 2206 } 2207#endif 2208 // If interpreter mode is enabled, every method (except native and proxy) must 2209 // be run with interpreter. 2210 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2211 !method->IsNative() && !method->IsProxyMethod(); 2212} 2213 2214void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2215 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2216 if (klass->NumDirectMethods() == 0) { 2217 return; // No direct methods => no static methods. 2218 } 2219 Runtime* runtime = Runtime::Current(); 2220 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2221 return; // OAT file unavailable. 2222 } 2223 const DexFile& dex_file = klass->GetDexFile(); 2224 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2225 CHECK(dex_class_def != nullptr); 2226 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2227 // There should always be class data if there were direct methods. 2228 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2229 ClassDataItemIterator it(dex_file, class_data); 2230 // Skip fields 2231 while (it.HasNextStaticField()) { 2232 it.Next(); 2233 } 2234 while (it.HasNextInstanceField()) { 2235 it.Next(); 2236 } 2237 OatFile::OatClass oat_class; 2238 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2239 // Link the code of methods skipped by LinkCode. 2240 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2241 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2242 if (!method->IsStatic()) { 2243 // Only update static methods. 2244 continue; 2245 } 2246 const void* portable_code = nullptr; 2247 const void* quick_code = nullptr; 2248 if (has_oat_class) { 2249 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2250 portable_code = oat_method.GetPortableCode(); 2251 quick_code = oat_method.GetQuickCode(); 2252 } 2253 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2254 bool have_portable_code = false; 2255 if (enter_interpreter) { 2256 // Use interpreter entry point. 2257 // Check whether the method is native, in which case it's generic JNI. 2258 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2259 quick_code = GetQuickGenericJniTrampoline(); 2260 portable_code = GetPortableToQuickBridge(); 2261 } else { 2262 portable_code = GetPortableToInterpreterBridge(); 2263 quick_code = GetQuickToInterpreterBridge(); 2264 } 2265 } else { 2266 if (portable_code == nullptr) { 2267 portable_code = GetPortableToQuickBridge(); 2268 } else { 2269 have_portable_code = true; 2270 } 2271 if (quick_code == nullptr) { 2272 quick_code = GetQuickToPortableBridge(); 2273 } 2274 } 2275 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2276 have_portable_code); 2277 } 2278 // Ignore virtual methods on the iterator. 2279} 2280 2281void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2282 const DexFile& dex_file, uint32_t dex_method_index, 2283 uint32_t method_index) { 2284 if (Runtime::Current()->IsCompiler()) { 2285 // The following code only applies to a non-compiler runtime. 2286 return; 2287 } 2288 // Method shouldn't have already been linked. 2289 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2290 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2291 if (oat_class != nullptr) { 2292 // Every kind of method should at least get an invoke stub from the oat_method. 2293 // non-abstract methods also get their code pointers. 2294 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2295 oat_method.LinkMethod(method.Get()); 2296 } 2297 2298 // Install entry point from interpreter. 2299 bool enter_interpreter = NeedsInterpreter(method.Get(), 2300 method->GetEntryPointFromQuickCompiledCode(), 2301 method->GetEntryPointFromPortableCompiledCode()); 2302 if (enter_interpreter && !method->IsNative()) { 2303 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2304 } else { 2305 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2306 } 2307 2308 if (method->IsAbstract()) { 2309 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2310 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2311 return; 2312 } 2313 2314 bool have_portable_code = false; 2315 if (method->IsStatic() && !method->IsConstructor()) { 2316 // For static methods excluding the class initializer, install the trampoline. 2317 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2318 // after initializing class (see ClassLinker::InitializeClass method). 2319 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2320 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2321 } else if (enter_interpreter) { 2322 if (!method->IsNative()) { 2323 // Set entry point from compiled code if there's no code or in interpreter only mode. 2324 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2325 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2326 } else { 2327 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2328 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2329 } 2330 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2331 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2332 have_portable_code = true; 2333 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2334 } else { 2335 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2336 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2337 } 2338 2339 if (method->IsNative()) { 2340 // Unregistering restores the dlsym lookup stub. 2341 method->UnregisterNative(Thread::Current()); 2342 2343 if (enter_interpreter) { 2344 // We have a native method here without code. Then it should have either the GenericJni 2345 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2346 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2347 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2348 } 2349 } 2350 2351 // Allow instrumentation its chance to hijack code. 2352 Runtime* runtime = Runtime::Current(); 2353 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2354 method->GetEntryPointFromQuickCompiledCode(), 2355 method->GetEntryPointFromPortableCompiledCode(), 2356 have_portable_code); 2357} 2358 2359void ClassLinker::LoadClass(const DexFile& dex_file, 2360 const DexFile::ClassDef& dex_class_def, 2361 Handle<mirror::Class> klass, 2362 mirror::ClassLoader* class_loader) { 2363 CHECK(klass.Get() != NULL); 2364 CHECK(klass->GetDexCache() != NULL); 2365 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2366 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2367 CHECK(descriptor != NULL); 2368 2369 klass->SetClass(GetClassRoot(kJavaLangClass)); 2370 if (kUseBakerOrBrooksReadBarrier) { 2371 klass->AssertReadBarrierPointer(); 2372 } 2373 uint32_t access_flags = dex_class_def.access_flags_; 2374 // Make sure that none of our runtime-only flags are set. 2375 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2376 klass->SetAccessFlags(access_flags); 2377 klass->SetClassLoader(class_loader); 2378 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2379 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2380 2381 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2382 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2383 2384 const byte* class_data = dex_file.GetClassData(dex_class_def); 2385 if (class_data == NULL) { 2386 return; // no fields or methods - for example a marker interface 2387 } 2388 2389 OatFile::OatClass oat_class; 2390 if (Runtime::Current()->IsStarted() 2391 && !Runtime::Current()->UseCompileTimeClassPath() 2392 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2393 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2394 } else { 2395 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2396 } 2397} 2398 2399void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2400 const byte* class_data, 2401 Handle<mirror::Class> klass, 2402 mirror::ClassLoader* class_loader, 2403 const OatFile::OatClass* oat_class) { 2404 // Load fields. 2405 ClassDataItemIterator it(dex_file, class_data); 2406 Thread* self = Thread::Current(); 2407 if (it.NumStaticFields() != 0) { 2408 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2409 if (UNLIKELY(statics == NULL)) { 2410 CHECK(self->IsExceptionPending()); // OOME. 2411 return; 2412 } 2413 klass->SetSFields(statics); 2414 } 2415 if (it.NumInstanceFields() != 0) { 2416 mirror::ObjectArray<mirror::ArtField>* fields = 2417 AllocArtFieldArray(self, it.NumInstanceFields()); 2418 if (UNLIKELY(fields == NULL)) { 2419 CHECK(self->IsExceptionPending()); // OOME. 2420 return; 2421 } 2422 klass->SetIFields(fields); 2423 } 2424 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2425 StackHandleScope<1> hs(self); 2426 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2427 if (UNLIKELY(sfield.Get() == NULL)) { 2428 CHECK(self->IsExceptionPending()); // OOME. 2429 return; 2430 } 2431 klass->SetStaticField(i, sfield.Get()); 2432 LoadField(dex_file, it, klass, sfield); 2433 } 2434 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2435 StackHandleScope<1> hs(self); 2436 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2437 if (UNLIKELY(ifield.Get() == NULL)) { 2438 CHECK(self->IsExceptionPending()); // OOME. 2439 return; 2440 } 2441 klass->SetInstanceField(i, ifield.Get()); 2442 LoadField(dex_file, it, klass, ifield); 2443 } 2444 2445 // Load methods. 2446 if (it.NumDirectMethods() != 0) { 2447 // TODO: append direct methods to class object 2448 mirror::ObjectArray<mirror::ArtMethod>* directs = 2449 AllocArtMethodArray(self, it.NumDirectMethods()); 2450 if (UNLIKELY(directs == NULL)) { 2451 CHECK(self->IsExceptionPending()); // OOME. 2452 return; 2453 } 2454 klass->SetDirectMethods(directs); 2455 } 2456 if (it.NumVirtualMethods() != 0) { 2457 // TODO: append direct methods to class object 2458 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2459 AllocArtMethodArray(self, it.NumVirtualMethods()); 2460 if (UNLIKELY(virtuals == NULL)) { 2461 CHECK(self->IsExceptionPending()); // OOME. 2462 return; 2463 } 2464 klass->SetVirtualMethods(virtuals); 2465 } 2466 size_t class_def_method_index = 0; 2467 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2468 StackHandleScope<1> hs(self); 2469 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2470 if (UNLIKELY(method.Get() == NULL)) { 2471 CHECK(self->IsExceptionPending()); // OOME. 2472 return; 2473 } 2474 klass->SetDirectMethod(i, method.Get()); 2475 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2476 method->SetMethodIndex(class_def_method_index); 2477 class_def_method_index++; 2478 } 2479 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2480 StackHandleScope<1> hs(self); 2481 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2482 if (UNLIKELY(method.Get() == NULL)) { 2483 CHECK(self->IsExceptionPending()); // OOME. 2484 return; 2485 } 2486 klass->SetVirtualMethod(i, method.Get()); 2487 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2488 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2489 class_def_method_index++; 2490 } 2491 DCHECK(!it.HasNext()); 2492} 2493 2494void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2495 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2496 uint32_t field_idx = it.GetMemberIndex(); 2497 dst->SetDexFieldIndex(field_idx); 2498 dst->SetDeclaringClass(klass.Get()); 2499 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2500} 2501 2502mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2503 const ClassDataItemIterator& it, 2504 Handle<mirror::Class> klass) { 2505 uint32_t dex_method_idx = it.GetMemberIndex(); 2506 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2507 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2508 2509 mirror::ArtMethod* dst = AllocArtMethod(self); 2510 if (UNLIKELY(dst == NULL)) { 2511 CHECK(self->IsExceptionPending()); // OOME. 2512 return NULL; 2513 } 2514 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2515 2516 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2517 dst->SetDexMethodIndex(dex_method_idx); 2518 dst->SetDeclaringClass(klass.Get()); 2519 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2520 2521 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2522 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2523 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2524 2525 uint32_t access_flags = it.GetMemberAccessFlags(); 2526 2527 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2528 // Set finalizable flag on declaring class. 2529 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2530 // Void return type. 2531 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2532 klass->SetFinalizable(); 2533 } else { 2534 std::string temp; 2535 const char* klass_descriptor = klass->GetDescriptor(&temp); 2536 // The Enum class declares a "final" finalize() method to prevent subclasses from 2537 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2538 // subclasses, so we exclude it here. 2539 // We also want to avoid setting the flag on Object, where we know that finalize() is 2540 // empty. 2541 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2542 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2543 klass->SetFinalizable(); 2544 } 2545 } 2546 } 2547 } else if (method_name[0] == '<') { 2548 // Fix broken access flags for initializers. Bug 11157540. 2549 bool is_init = (strcmp("<init>", method_name) == 0); 2550 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2551 if (UNLIKELY(!is_init && !is_clinit)) { 2552 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2553 } else { 2554 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2555 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2556 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2557 access_flags |= kAccConstructor; 2558 } 2559 } 2560 } 2561 dst->SetAccessFlags(access_flags); 2562 2563 self->EndAssertNoThreadSuspension(old_cause); 2564 return dst; 2565} 2566 2567void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2568 Thread* self = Thread::Current(); 2569 StackHandleScope<1> hs(self); 2570 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2571 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2572 AppendToBootClassPath(dex_file, dex_cache); 2573} 2574 2575void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2576 Handle<mirror::DexCache> dex_cache) { 2577 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2578 boot_class_path_.push_back(&dex_file); 2579 RegisterDexFile(dex_file, dex_cache); 2580} 2581 2582bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2583 dex_lock_.AssertSharedHeld(Thread::Current()); 2584 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2585 mirror::DexCache* dex_cache = GetDexCache(i); 2586 if (dex_cache->GetDexFile() == &dex_file) { 2587 return true; 2588 } 2589 } 2590 return false; 2591} 2592 2593bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2594 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2595 return IsDexFileRegisteredLocked(dex_file); 2596} 2597 2598void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2599 Handle<mirror::DexCache> dex_cache) { 2600 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2601 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2602 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2603 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2604 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2605 dex_cache->SetDexFile(&dex_file); 2606 if (log_new_dex_caches_roots_) { 2607 // TODO: This is not safe if we can remove dex caches. 2608 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2609 } 2610} 2611 2612void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2613 Thread* self = Thread::Current(); 2614 { 2615 ReaderMutexLock mu(self, dex_lock_); 2616 if (IsDexFileRegisteredLocked(dex_file)) { 2617 return; 2618 } 2619 } 2620 // Don't alloc while holding the lock, since allocation may need to 2621 // suspend all threads and another thread may need the dex_lock_ to 2622 // get to a suspend point. 2623 StackHandleScope<1> hs(self); 2624 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2625 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2626 { 2627 WriterMutexLock mu(self, dex_lock_); 2628 if (IsDexFileRegisteredLocked(dex_file)) { 2629 return; 2630 } 2631 RegisterDexFileLocked(dex_file, dex_cache); 2632 } 2633} 2634 2635void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2636 Handle<mirror::DexCache> dex_cache) { 2637 WriterMutexLock mu(Thread::Current(), dex_lock_); 2638 RegisterDexFileLocked(dex_file, dex_cache); 2639} 2640 2641mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2642 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2643 // Search assuming unique-ness of dex file. 2644 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2645 mirror::DexCache* dex_cache = GetDexCache(i); 2646 if (dex_cache->GetDexFile() == &dex_file) { 2647 return dex_cache; 2648 } 2649 } 2650 // Search matching by location name. 2651 std::string location(dex_file.GetLocation()); 2652 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2653 mirror::DexCache* dex_cache = GetDexCache(i); 2654 if (dex_cache->GetDexFile()->GetLocation() == location) { 2655 return dex_cache; 2656 } 2657 } 2658 // Failure, dump diagnostic and abort. 2659 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2660 mirror::DexCache* dex_cache = GetDexCache(i); 2661 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2662 } 2663 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2664 return NULL; 2665} 2666 2667void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2668 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2669 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2670 mirror::DexCache* dex_cache = GetDexCache(i); 2671 dex_cache->Fixup(resolution_method); 2672 } 2673} 2674 2675mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2676 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2677 if (UNLIKELY(klass == NULL)) { 2678 return NULL; 2679 } 2680 return InitializePrimitiveClass(klass, type); 2681} 2682 2683mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2684 Primitive::Type type) { 2685 CHECK(primitive_class != NULL); 2686 // Must hold lock on object when initializing. 2687 Thread* self = Thread::Current(); 2688 StackHandleScope<1> hs(self); 2689 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2690 ObjectLock<mirror::Class> lock(self, h_class); 2691 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2692 primitive_class->SetPrimitiveType(type); 2693 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2694 const char* descriptor = Primitive::Descriptor(type); 2695 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2696 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2697 return primitive_class; 2698} 2699 2700// Create an array class (i.e. the class object for the array, not the 2701// array itself). "descriptor" looks like "[C" or "[[[[B" or 2702// "[Ljava/lang/String;". 2703// 2704// If "descriptor" refers to an array of primitives, look up the 2705// primitive type's internally-generated class object. 2706// 2707// "class_loader" is the class loader of the class that's referring to 2708// us. It's used to ensure that we're looking for the element type in 2709// the right context. It does NOT become the class loader for the 2710// array class; that always comes from the base element class. 2711// 2712// Returns NULL with an exception raised on failure. 2713mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2714 Handle<mirror::ClassLoader> class_loader) { 2715 // Identify the underlying component type 2716 CHECK_EQ('[', descriptor[0]); 2717 StackHandleScope<2> hs(self); 2718 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2719 if (component_type.Get() == nullptr) { 2720 DCHECK(self->IsExceptionPending()); 2721 // We need to accept erroneous classes as component types. 2722 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2723 if (component_type.Get() == nullptr) { 2724 DCHECK(self->IsExceptionPending()); 2725 return nullptr; 2726 } else { 2727 self->ClearException(); 2728 } 2729 } 2730 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2731 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2732 return nullptr; 2733 } 2734 // See if the component type is already loaded. Array classes are 2735 // always associated with the class loader of their underlying 2736 // element type -- an array of Strings goes with the loader for 2737 // java/lang/String -- so we need to look for it there. (The 2738 // caller should have checked for the existence of the class 2739 // before calling here, but they did so with *their* class loader, 2740 // not the component type's loader.) 2741 // 2742 // If we find it, the caller adds "loader" to the class' initiating 2743 // loader list, which should prevent us from going through this again. 2744 // 2745 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2746 // are the same, because our caller (FindClass) just did the 2747 // lookup. (Even if we get this wrong we still have correct behavior, 2748 // because we effectively do this lookup again when we add the new 2749 // class to the hash table --- necessary because of possible races with 2750 // other threads.) 2751 if (class_loader.Get() != component_type->GetClassLoader()) { 2752 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2753 if (new_class != NULL) { 2754 return new_class; 2755 } 2756 } 2757 2758 // Fill out the fields in the Class. 2759 // 2760 // It is possible to execute some methods against arrays, because 2761 // all arrays are subclasses of java_lang_Object_, so we need to set 2762 // up a vtable. We can just point at the one in java_lang_Object_. 2763 // 2764 // Array classes are simple enough that we don't need to do a full 2765 // link step. 2766 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2767 if (UNLIKELY(!init_done_)) { 2768 // Classes that were hand created, ie not by FindSystemClass 2769 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2770 new_class.Assign(GetClassRoot(kClassArrayClass)); 2771 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2772 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2773 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2774 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2775 } else if (strcmp(descriptor, 2776 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2777 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2778 } else if (strcmp(descriptor, 2779 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2780 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2781 } else if (strcmp(descriptor, "[C") == 0) { 2782 new_class.Assign(GetClassRoot(kCharArrayClass)); 2783 } else if (strcmp(descriptor, "[I") == 0) { 2784 new_class.Assign(GetClassRoot(kIntArrayClass)); 2785 } 2786 } 2787 if (new_class.Get() == nullptr) { 2788 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2789 if (new_class.Get() == nullptr) { 2790 return nullptr; 2791 } 2792 new_class->SetComponentType(component_type.Get()); 2793 } 2794 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2795 DCHECK(new_class->GetComponentType() != NULL); 2796 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2797 new_class->SetSuperClass(java_lang_Object); 2798 new_class->SetVTable(java_lang_Object->GetVTable()); 2799 new_class->SetPrimitiveType(Primitive::kPrimNot); 2800 new_class->SetClassLoader(component_type->GetClassLoader()); 2801 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2802 new_class->PopulateEmbeddedImtAndVTable(); 2803 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2804 // don't need to set new_class->SetObjectSize(..) 2805 // because Object::SizeOf delegates to Array::SizeOf 2806 2807 2808 // All arrays have java/lang/Cloneable and java/io/Serializable as 2809 // interfaces. We need to set that up here, so that stuff like 2810 // "instanceof" works right. 2811 // 2812 // Note: The GC could run during the call to FindSystemClass, 2813 // so we need to make sure the class object is GC-valid while we're in 2814 // there. Do this by clearing the interface list so the GC will just 2815 // think that the entries are null. 2816 2817 2818 // Use the single, global copies of "interfaces" and "iftable" 2819 // (remember not to free them for arrays). 2820 { 2821 mirror::IfTable* array_iftable = array_iftable_.Read(); 2822 CHECK(array_iftable != nullptr); 2823 new_class->SetIfTable(array_iftable); 2824 } 2825 2826 // Inherit access flags from the component type. 2827 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2828 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2829 access_flags &= kAccJavaFlagsMask; 2830 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2831 // and remove "interface". 2832 access_flags |= kAccAbstract | kAccFinal; 2833 access_flags &= ~kAccInterface; 2834 2835 new_class->SetAccessFlags(access_flags); 2836 2837 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2838 if (existing == nullptr) { 2839 return new_class.Get(); 2840 } 2841 // Another thread must have loaded the class after we 2842 // started but before we finished. Abandon what we've 2843 // done. 2844 // 2845 // (Yes, this happens.) 2846 2847 return existing; 2848} 2849 2850mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2851 switch (type) { 2852 case 'B': 2853 return GetClassRoot(kPrimitiveByte); 2854 case 'C': 2855 return GetClassRoot(kPrimitiveChar); 2856 case 'D': 2857 return GetClassRoot(kPrimitiveDouble); 2858 case 'F': 2859 return GetClassRoot(kPrimitiveFloat); 2860 case 'I': 2861 return GetClassRoot(kPrimitiveInt); 2862 case 'J': 2863 return GetClassRoot(kPrimitiveLong); 2864 case 'S': 2865 return GetClassRoot(kPrimitiveShort); 2866 case 'Z': 2867 return GetClassRoot(kPrimitiveBoolean); 2868 case 'V': 2869 return GetClassRoot(kPrimitiveVoid); 2870 default: 2871 break; 2872 } 2873 std::string printable_type(PrintableChar(type)); 2874 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2875 return NULL; 2876} 2877 2878mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2879 size_t hash) { 2880 if (VLOG_IS_ON(class_linker)) { 2881 mirror::DexCache* dex_cache = klass->GetDexCache(); 2882 std::string source; 2883 if (dex_cache != NULL) { 2884 source += " from "; 2885 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2886 } 2887 LOG(INFO) << "Loaded class " << descriptor << source; 2888 } 2889 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2890 mirror::Class* existing = 2891 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2892 if (existing != NULL) { 2893 return existing; 2894 } 2895 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2896 dex_cache_image_class_lookup_required_) { 2897 // Check a class loaded with the system class loader matches one in the image if the class 2898 // is in the image. 2899 existing = LookupClassFromImage(descriptor); 2900 if (existing != NULL) { 2901 CHECK(klass == existing); 2902 } 2903 } 2904 VerifyObject(klass); 2905 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2906 if (log_new_class_table_roots_) { 2907 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2908 } 2909 return NULL; 2910} 2911 2912mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2913 size_t hash) { 2914 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2915 mirror::Class* existing = 2916 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2917 2918 if (existing == nullptr) { 2919 CHECK(klass->IsProxyClass()); 2920 return nullptr; 2921 } 2922 2923 CHECK_NE(existing, klass) << descriptor; 2924 CHECK(!existing->IsResolved()) << descriptor; 2925 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2926 2927 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2928 ++it) { 2929 mirror::Class* klass = it->second.Read(); 2930 if (klass == existing) { 2931 class_table_.erase(it); 2932 break; 2933 } 2934 } 2935 2936 CHECK(!klass->IsTemp()) << descriptor; 2937 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2938 dex_cache_image_class_lookup_required_) { 2939 // Check a class loaded with the system class loader matches one in the image if the class 2940 // is in the image. 2941 existing = LookupClassFromImage(descriptor); 2942 if (existing != nullptr) { 2943 CHECK(klass == existing) << descriptor; 2944 } 2945 } 2946 VerifyObject(klass); 2947 2948 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2949 if (log_new_class_table_roots_) { 2950 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2951 } 2952 2953 return existing; 2954} 2955 2956bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2957 size_t hash = Hash(descriptor); 2958 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2959 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2960 it != end && it->first == hash; 2961 ++it) { 2962 mirror::Class* klass = it->second.Read(); 2963 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2964 class_table_.erase(it); 2965 return true; 2966 } 2967 } 2968 return false; 2969} 2970 2971mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2972 const mirror::ClassLoader* class_loader) { 2973 size_t hash = Hash(descriptor); 2974 { 2975 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2976 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2977 if (result != NULL) { 2978 return result; 2979 } 2980 } 2981 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2982 return NULL; 2983 } else { 2984 // Lookup failed but need to search dex_caches_. 2985 mirror::Class* result = LookupClassFromImage(descriptor); 2986 if (result != NULL) { 2987 InsertClass(descriptor, result, hash); 2988 } else { 2989 // Searching the image dex files/caches failed, we don't want to get into this situation 2990 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2991 // classes into the class table. 2992 const int32_t kMaxFailedDexCacheLookups = 1000; 2993 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2994 MoveImageClassesToClassTable(); 2995 } 2996 } 2997 return result; 2998 } 2999} 3000 3001mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3002 const mirror::ClassLoader* class_loader, 3003 size_t hash) { 3004 auto end = class_table_.end(); 3005 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3006 mirror::Class* klass = it->second.Read(); 3007 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3008 if (kIsDebugBuild) { 3009 // Check for duplicates in the table. 3010 for (++it; it != end && it->first == hash; ++it) { 3011 mirror::Class* klass2 = it->second.Read(); 3012 CHECK(!(klass2->GetClassLoader() == class_loader && 3013 klass2->DescriptorEquals(descriptor))) 3014 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3015 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3016 } 3017 } 3018 return klass; 3019 } 3020 } 3021 return NULL; 3022} 3023 3024static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3025 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3026 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3027 CHECK(image != NULL); 3028 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3029 return root->AsObjectArray<mirror::DexCache>(); 3030} 3031 3032void ClassLinker::MoveImageClassesToClassTable() { 3033 Thread* self = Thread::Current(); 3034 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3035 if (!dex_cache_image_class_lookup_required_) { 3036 return; // All dex cache classes are already in the class table. 3037 } 3038 const char* old_no_suspend_cause = 3039 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3040 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3041 std::string temp; 3042 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3043 mirror::DexCache* dex_cache = dex_caches->Get(i); 3044 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3045 for (int32_t j = 0; j < types->GetLength(); j++) { 3046 mirror::Class* klass = types->Get(j); 3047 if (klass != NULL) { 3048 DCHECK(klass->GetClassLoader() == NULL); 3049 const char* descriptor = klass->GetDescriptor(&temp); 3050 size_t hash = Hash(descriptor); 3051 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3052 if (existing != NULL) { 3053 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3054 << PrettyClassAndClassLoader(klass); 3055 } else { 3056 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3057 if (log_new_class_table_roots_) { 3058 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3059 } 3060 } 3061 } 3062 } 3063 } 3064 dex_cache_image_class_lookup_required_ = false; 3065 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3066} 3067 3068mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3069 Thread* self = Thread::Current(); 3070 const char* old_no_suspend_cause = 3071 self->StartAssertNoThreadSuspension("Image class lookup"); 3072 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3073 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3074 mirror::DexCache* dex_cache = dex_caches->Get(i); 3075 const DexFile* dex_file = dex_cache->GetDexFile(); 3076 // Try binary searching the string/type index. 3077 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3078 if (string_id != NULL) { 3079 const DexFile::TypeId* type_id = 3080 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3081 if (type_id != NULL) { 3082 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3083 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3084 if (klass != NULL) { 3085 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3086 return klass; 3087 } 3088 } 3089 } 3090 } 3091 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3092 return NULL; 3093} 3094 3095void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3096 result.clear(); 3097 if (dex_cache_image_class_lookup_required_) { 3098 MoveImageClassesToClassTable(); 3099 } 3100 size_t hash = Hash(descriptor); 3101 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3102 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3103 it != end && it->first == hash; ++it) { 3104 mirror::Class* klass = it->second.Read(); 3105 if (klass->DescriptorEquals(descriptor)) { 3106 result.push_back(klass); 3107 } 3108 } 3109} 3110 3111void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3112 // TODO: assert that the monitor on the Class is held 3113 Thread* self = Thread::Current(); 3114 ObjectLock<mirror::Class> lock(self, klass); 3115 3116 // Don't attempt to re-verify if already sufficiently verified. 3117 if (klass->IsVerified() || 3118 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3119 return; 3120 } 3121 3122 // The class might already be erroneous, for example at compile time if we attempted to verify 3123 // this class as a parent to another. 3124 if (klass->IsErroneous()) { 3125 ThrowEarlierClassFailure(klass.Get()); 3126 return; 3127 } 3128 3129 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3130 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3131 } else { 3132 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3133 << PrettyClass(klass.Get()); 3134 CHECK(!Runtime::Current()->IsCompiler()); 3135 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3136 } 3137 3138 // Skip verification if disabled. 3139 if (!Runtime::Current()->IsVerificationEnabled()) { 3140 klass->SetStatus(mirror::Class::kStatusVerified, self); 3141 return; 3142 } 3143 3144 // Verify super class. 3145 StackHandleScope<2> hs(self); 3146 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3147 if (super.Get() != NULL) { 3148 // Acquire lock to prevent races on verifying the super class. 3149 ObjectLock<mirror::Class> lock(self, super); 3150 3151 if (!super->IsVerified() && !super->IsErroneous()) { 3152 VerifyClass(super); 3153 } 3154 if (!super->IsCompileTimeVerified()) { 3155 std::string error_msg( 3156 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3157 PrettyDescriptor(klass.Get()).c_str(), 3158 PrettyDescriptor(super.Get()).c_str())); 3159 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3160 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3161 if (cause.Get() != nullptr) { 3162 self->ClearException(); 3163 } 3164 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3165 if (cause.Get() != nullptr) { 3166 self->GetException(nullptr)->SetCause(cause.Get()); 3167 } 3168 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3169 if (Runtime::Current()->IsCompiler()) { 3170 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3171 } 3172 klass->SetStatus(mirror::Class::kStatusError, self); 3173 return; 3174 } 3175 } 3176 3177 // Try to use verification information from the oat file, otherwise do runtime verification. 3178 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3179 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3180 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3181 if (oat_file_class_status == mirror::Class::kStatusError) { 3182 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3183 << PrettyDescriptor(klass.Get()) << " in " 3184 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3185 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3186 PrettyDescriptor(klass.Get()).c_str()); 3187 klass->SetStatus(mirror::Class::kStatusError, self); 3188 return; 3189 } 3190 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3191 std::string error_msg; 3192 if (!preverified) { 3193 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3194 Runtime::Current()->IsCompiler(), 3195 &error_msg); 3196 } 3197 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3198 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3199 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3200 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3201 << " because: " << error_msg; 3202 } 3203 self->AssertNoPendingException(); 3204 // Make sure all classes referenced by catch blocks are resolved. 3205 ResolveClassExceptionHandlerTypes(dex_file, klass); 3206 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3207 // Even though there were no verifier failures we need to respect whether the super-class 3208 // was verified or requiring runtime reverification. 3209 if (super.Get() == NULL || super->IsVerified()) { 3210 klass->SetStatus(mirror::Class::kStatusVerified, self); 3211 } else { 3212 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3213 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3214 // Pretend a soft failure occured so that we don't consider the class verified below. 3215 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3216 } 3217 } else { 3218 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3219 // Soft failures at compile time should be retried at runtime. Soft 3220 // failures at runtime will be handled by slow paths in the generated 3221 // code. Set status accordingly. 3222 if (Runtime::Current()->IsCompiler()) { 3223 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3224 } else { 3225 klass->SetStatus(mirror::Class::kStatusVerified, self); 3226 } 3227 } 3228 } else { 3229 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3230 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3231 << " because: " << error_msg; 3232 self->AssertNoPendingException(); 3233 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3234 klass->SetStatus(mirror::Class::kStatusError, self); 3235 } 3236 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3237 // Class is verified so we don't need to do any access check on its methods. 3238 // Let the interpreter know it by setting the kAccPreverified flag onto each 3239 // method. 3240 // Note: we're going here during compilation and at runtime. When we set the 3241 // kAccPreverified flag when compiling image classes, the flag is recorded 3242 // in the image and is set when loading the image. 3243 klass->SetPreverifiedFlagOnAllMethods(); 3244 } 3245} 3246 3247bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3248 mirror::Class::Status& oat_file_class_status) { 3249 // If we're compiling, we can only verify the class using the oat file if 3250 // we are not compiling the image or if the class we're verifying is not part of 3251 // the app. In other words, we will only check for preverification of bootclasspath 3252 // classes. 3253 if (Runtime::Current()->IsCompiler()) { 3254 // Are we compiling the bootclasspath? 3255 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3256 return false; 3257 } 3258 // We are compiling an app (not the image). 3259 3260 // Is this an app class? (I.e. not a bootclasspath class) 3261 if (klass->GetClassLoader() != NULL) { 3262 return false; 3263 } 3264 } 3265 3266 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3267 // Make this work with gtests, which do not set up the image properly. 3268 // TODO: we should clean up gtests to set up the image path properly. 3269 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3270 return false; 3271 } 3272 3273 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3274 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3275 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3276 &dex_location_checksum); 3277 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3278 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3279 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3280 if (oat_file_class_status == mirror::Class::kStatusVerified || 3281 oat_file_class_status == mirror::Class::kStatusInitialized) { 3282 return true; 3283 } 3284 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3285 // Compile time verification failed with a soft error. Compile time verification can fail 3286 // because we have incomplete type information. Consider the following: 3287 // class ... { 3288 // Foo x; 3289 // .... () { 3290 // if (...) { 3291 // v1 gets assigned a type of resolved class Foo 3292 // } else { 3293 // v1 gets assigned a type of unresolved class Bar 3294 // } 3295 // iput x = v1 3296 // } } 3297 // when we merge v1 following the if-the-else it results in Conflict 3298 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3299 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3300 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3301 // at compile time). 3302 return false; 3303 } 3304 if (oat_file_class_status == mirror::Class::kStatusError) { 3305 // Compile time verification failed with a hard error. This is caused by invalid instructions 3306 // in the class. These errors are unrecoverable. 3307 return false; 3308 } 3309 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3310 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3311 // not loading the class. 3312 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3313 // isn't a problem and this case shouldn't occur 3314 return false; 3315 } 3316 std::string temp; 3317 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3318 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3319 << klass->GetDescriptor(&temp); 3320 3321 return false; 3322} 3323 3324void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3325 Handle<mirror::Class> klass) { 3326 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3327 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3328 } 3329 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3330 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3331 } 3332} 3333 3334void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3335 mirror::ArtMethod* method) { 3336 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3337 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3338 if (code_item == NULL) { 3339 return; // native or abstract method 3340 } 3341 if (code_item->tries_size_ == 0) { 3342 return; // nothing to process 3343 } 3344 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3345 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3346 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3347 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3348 CatchHandlerIterator iterator(handlers_ptr); 3349 for (; iterator.HasNext(); iterator.Next()) { 3350 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3351 // unresolved exception types will be ignored by exception delivery 3352 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3353 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3354 if (exception_type == NULL) { 3355 DCHECK(Thread::Current()->IsExceptionPending()); 3356 Thread::Current()->ClearException(); 3357 } 3358 } 3359 } 3360 handlers_ptr = iterator.EndDataPointer(); 3361 } 3362} 3363 3364static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3365static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3366 Handle<mirror::ArtMethod> prototype); 3367 3368mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3369 jobjectArray interfaces, jobject loader, 3370 jobjectArray methods, jobjectArray throws) { 3371 Thread* self = soa.Self(); 3372 StackHandleScope<8> hs(self); 3373 Handle<mirror::Class> klass(hs.NewHandle( 3374 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3375 if (klass.Get() == NULL) { 3376 CHECK(self->IsExceptionPending()); // OOME. 3377 return NULL; 3378 } 3379 DCHECK(klass->GetClass() != NULL); 3380 klass->SetObjectSize(sizeof(mirror::Proxy)); 3381 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3382 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3383 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3384 klass->SetName(soa.Decode<mirror::String*>(name)); 3385 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3386 klass->SetDexCache(proxy_class->GetDexCache()); 3387 klass->SetStatus(mirror::Class::kStatusIdx, self); 3388 3389 // Instance fields are inherited, but we add a couple of static fields... 3390 { 3391 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3392 if (UNLIKELY(sfields == NULL)) { 3393 CHECK(self->IsExceptionPending()); // OOME. 3394 return NULL; 3395 } 3396 klass->SetSFields(sfields); 3397 } 3398 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3399 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3400 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3401 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3402 CHECK(self->IsExceptionPending()); // OOME. 3403 return nullptr; 3404 } 3405 klass->SetStaticField(0, interfaces_sfield.Get()); 3406 interfaces_sfield->SetDexFieldIndex(0); 3407 interfaces_sfield->SetDeclaringClass(klass.Get()); 3408 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3409 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3410 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3411 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3412 CHECK(self->IsExceptionPending()); // OOME. 3413 return nullptr; 3414 } 3415 klass->SetStaticField(1, throws_sfield.Get()); 3416 throws_sfield->SetDexFieldIndex(1); 3417 throws_sfield->SetDeclaringClass(klass.Get()); 3418 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3419 3420 // Proxies have 1 direct method, the constructor 3421 { 3422 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3423 if (UNLIKELY(directs == nullptr)) { 3424 CHECK(self->IsExceptionPending()); // OOME. 3425 return nullptr; 3426 } 3427 klass->SetDirectMethods(directs); 3428 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3429 if (UNLIKELY(constructor == nullptr)) { 3430 CHECK(self->IsExceptionPending()); // OOME. 3431 return nullptr; 3432 } 3433 klass->SetDirectMethod(0, constructor); 3434 } 3435 3436 // Create virtual method using specified prototypes. 3437 size_t num_virtual_methods = 3438 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3439 { 3440 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3441 num_virtual_methods); 3442 if (UNLIKELY(virtuals == NULL)) { 3443 CHECK(self->IsExceptionPending()); // OOME. 3444 return NULL; 3445 } 3446 klass->SetVirtualMethods(virtuals); 3447 } 3448 for (size_t i = 0; i < num_virtual_methods; ++i) { 3449 StackHandleScope<1> hs(self); 3450 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3451 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3452 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3453 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3454 if (UNLIKELY(clone == nullptr)) { 3455 CHECK(self->IsExceptionPending()); // OOME. 3456 return nullptr; 3457 } 3458 klass->SetVirtualMethod(i, clone); 3459 } 3460 3461 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3462 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3463 self->AssertNoPendingException(); 3464 3465 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3466 mirror::Class* new_class = nullptr; 3467 { 3468 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3469 // Link the fields and virtual methods, creating vtable and iftables 3470 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3471 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3472 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3473 klass->SetStatus(mirror::Class::kStatusError, self); 3474 return nullptr; 3475 } 3476 } 3477 3478 CHECK(klass->IsRetired()); 3479 CHECK_NE(klass.Get(), new_class); 3480 klass.Assign(new_class); 3481 3482 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3483 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3484 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3485 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3486 3487 { 3488 // Lock on klass is released. Lock new class object. 3489 ObjectLock<mirror::Class> initialization_lock(self, klass); 3490 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3491 } 3492 3493 // sanity checks 3494 if (kIsDebugBuild) { 3495 CHECK(klass->GetIFields() == nullptr); 3496 CheckProxyConstructor(klass->GetDirectMethod(0)); 3497 for (size_t i = 0; i < num_virtual_methods; ++i) { 3498 StackHandleScope<2> hs(self); 3499 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3500 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3501 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3502 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3503 CheckProxyMethod(virtual_method, prototype); 3504 } 3505 3506 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3507 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3508 decoded_name->ToModifiedUtf8().c_str())); 3509 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3510 3511 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3512 decoded_name->ToModifiedUtf8().c_str())); 3513 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3514 3515 CHECK_EQ(klass.Get()->GetInterfaces(), 3516 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3517 CHECK_EQ(klass.Get()->GetThrows(), 3518 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3519 } 3520 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3521 CHECK(existing == nullptr); 3522 return klass.Get(); 3523} 3524 3525std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3526 DCHECK(proxy_class->IsProxyClass()); 3527 mirror::String* name = proxy_class->GetName(); 3528 DCHECK(name != NULL); 3529 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3530} 3531 3532mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3533 mirror::ArtMethod* proxy_method) { 3534 DCHECK(proxy_class->IsProxyClass()); 3535 DCHECK(proxy_method->IsProxyMethod()); 3536 // Locate the dex cache of the original interface/Object 3537 mirror::DexCache* dex_cache = nullptr; 3538 { 3539 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3540 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3541 mirror::DexCache* a_dex_cache = GetDexCache(i); 3542 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3543 dex_cache = a_dex_cache; 3544 break; 3545 } 3546 } 3547 } 3548 CHECK(dex_cache != nullptr); 3549 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3550 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3551 CHECK(resolved_method != nullptr); 3552 return resolved_method; 3553} 3554 3555 3556mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3557 Handle<mirror::Class> klass, 3558 mirror::Class* proxy_class) { 3559 // Create constructor for Proxy that must initialize h 3560 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3561 proxy_class->GetDirectMethods(); 3562 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3563 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3564 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3565 if (constructor == nullptr) { 3566 CHECK(self->IsExceptionPending()); // OOME. 3567 return nullptr; 3568 } 3569 // Make the proxy constructor's code always point to the uninstrumented code. This avoids 3570 // getting a method enter event for the proxy constructor as the proxy constructor doesn't 3571 // have an activation. 3572 bool have_portable_code; 3573 constructor->SetEntryPointFromQuickCompiledCode(GetQuickOatCodeFor(proxy_constructor)); 3574 constructor->SetEntryPointFromPortableCompiledCode(GetPortableOatCodeFor(proxy_constructor, 3575 &have_portable_code)); 3576 3577 // Make this constructor public and fix the class to be our Proxy version 3578 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3579 constructor->SetDeclaringClass(klass.Get()); 3580 return constructor; 3581} 3582 3583static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3584 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3585 CHECK(constructor->IsConstructor()); 3586 CHECK_STREQ(constructor->GetName(), "<init>"); 3587 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3588 "(Ljava/lang/reflect/InvocationHandler;)V"); 3589 DCHECK(constructor->IsPublic()); 3590} 3591 3592mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3593 Handle<mirror::Class> klass, 3594 Handle<mirror::ArtMethod> prototype) { 3595 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3596 // prototype method 3597 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3598 prototype.Get()); 3599 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3600 // as necessary 3601 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3602 if (UNLIKELY(method == NULL)) { 3603 CHECK(self->IsExceptionPending()); // OOME. 3604 return NULL; 3605 } 3606 3607 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3608 // the intersection of throw exceptions as defined in Proxy 3609 method->SetDeclaringClass(klass.Get()); 3610 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3611 3612 // At runtime the method looks like a reference and argument saving method, clone the code 3613 // related parameters from this method. 3614 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3615 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3616 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3617 3618 return method; 3619} 3620 3621static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3622 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3623 // Basic sanity 3624 CHECK(!prototype->IsFinal()); 3625 CHECK(method->IsFinal()); 3626 CHECK(!method->IsAbstract()); 3627 3628 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3629 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3630 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3631 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3632 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3633 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3634 3635 MethodHelper mh(method); 3636 MethodHelper mh2(prototype); 3637 CHECK_STREQ(method->GetName(), prototype->GetName()); 3638 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3639 // More complex sanity - via dex cache 3640 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3641} 3642 3643static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3644 bool can_init_parents) 3645 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3646 if (can_init_statics && can_init_parents) { 3647 return true; 3648 } 3649 if (!can_init_statics) { 3650 // Check if there's a class initializer. 3651 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3652 if (clinit != NULL) { 3653 return false; 3654 } 3655 // Check if there are encoded static values needing initialization. 3656 if (klass->NumStaticFields() != 0) { 3657 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3658 DCHECK(dex_class_def != NULL); 3659 if (dex_class_def->static_values_off_ != 0) { 3660 return false; 3661 } 3662 } 3663 } 3664 if (!klass->IsInterface() && klass->HasSuperClass()) { 3665 mirror::Class* super_class = klass->GetSuperClass(); 3666 if (!can_init_parents && !super_class->IsInitialized()) { 3667 return false; 3668 } else { 3669 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3670 return false; 3671 } 3672 } 3673 } 3674 return true; 3675} 3676 3677bool ClassLinker::IsInitialized() const { 3678 return init_done_; 3679} 3680 3681bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3682 bool can_init_parents) { 3683 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3684 3685 // Are we already initialized and therefore done? 3686 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3687 // an initialized class will never change its state. 3688 if (klass->IsInitialized()) { 3689 return true; 3690 } 3691 3692 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3693 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3694 return false; 3695 } 3696 3697 Thread* self = Thread::Current(); 3698 uint64_t t0; 3699 { 3700 ObjectLock<mirror::Class> lock(self, klass); 3701 3702 // Re-check under the lock in case another thread initialized ahead of us. 3703 if (klass->IsInitialized()) { 3704 return true; 3705 } 3706 3707 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3708 if (klass->IsErroneous()) { 3709 ThrowEarlierClassFailure(klass.Get()); 3710 return false; 3711 } 3712 3713 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3714 3715 if (!klass->IsVerified()) { 3716 VerifyClass(klass); 3717 if (!klass->IsVerified()) { 3718 // We failed to verify, expect either the klass to be erroneous or verification failed at 3719 // compile time. 3720 if (klass->IsErroneous()) { 3721 CHECK(self->IsExceptionPending()); 3722 } else { 3723 CHECK(Runtime::Current()->IsCompiler()); 3724 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3725 } 3726 return false; 3727 } 3728 } 3729 3730 // If the class is kStatusInitializing, either this thread is 3731 // initializing higher up the stack or another thread has beat us 3732 // to initializing and we need to wait. Either way, this 3733 // invocation of InitializeClass will not be responsible for 3734 // running <clinit> and will return. 3735 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3736 // We caught somebody else in the act; was it us? 3737 if (klass->GetClinitThreadId() == self->GetTid()) { 3738 // Yes. That's fine. Return so we can continue initializing. 3739 return true; 3740 } 3741 // No. That's fine. Wait for another thread to finish initializing. 3742 return WaitForInitializeClass(klass, self, lock); 3743 } 3744 3745 if (!ValidateSuperClassDescriptors(klass)) { 3746 klass->SetStatus(mirror::Class::kStatusError, self); 3747 return false; 3748 } 3749 3750 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3751 3752 // From here out other threads may observe that we're initializing and so changes of state 3753 // require the a notification. 3754 klass->SetClinitThreadId(self->GetTid()); 3755 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3756 3757 t0 = NanoTime(); 3758 } 3759 3760 // Initialize super classes, must be done while initializing for the JLS. 3761 if (!klass->IsInterface() && klass->HasSuperClass()) { 3762 mirror::Class* super_class = klass->GetSuperClass(); 3763 if (!super_class->IsInitialized()) { 3764 CHECK(!super_class->IsInterface()); 3765 CHECK(can_init_parents); 3766 StackHandleScope<1> hs(self); 3767 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3768 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3769 if (!super_initialized) { 3770 // The super class was verified ahead of entering initializing, we should only be here if 3771 // the super class became erroneous due to initialization. 3772 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3773 << "Super class initialization failed for " 3774 << PrettyDescriptor(handle_scope_super.Get()) 3775 << " that has unexpected status " << handle_scope_super->GetStatus() 3776 << "\nPending exception:\n" 3777 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3778 ObjectLock<mirror::Class> lock(self, klass); 3779 // Initialization failed because the super-class is erroneous. 3780 klass->SetStatus(mirror::Class::kStatusError, self); 3781 return false; 3782 } 3783 } 3784 } 3785 3786 if (klass->NumStaticFields() > 0) { 3787 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3788 CHECK(dex_class_def != NULL); 3789 const DexFile& dex_file = klass->GetDexFile(); 3790 StackHandleScope<2> hs(self); 3791 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3792 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3793 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3794 this, *dex_class_def); 3795 if (it.HasNext()) { 3796 CHECK(can_init_statics); 3797 // We reordered the fields, so we need to be able to map the 3798 // field indexes to the right fields. 3799 SafeMap<uint32_t, mirror::ArtField*> field_map; 3800 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3801 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3802 if (Runtime::Current()->IsActiveTransaction()) { 3803 it.ReadValueToField<true>(field_map.Get(i)); 3804 } else { 3805 it.ReadValueToField<false>(field_map.Get(i)); 3806 } 3807 } 3808 } 3809 } 3810 3811 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3812 if (clinit != NULL) { 3813 CHECK(can_init_statics); 3814 JValue result; 3815 clinit->Invoke(self, NULL, 0, &result, "V"); 3816 } 3817 3818 uint64_t t1 = NanoTime(); 3819 3820 bool success = true; 3821 { 3822 ObjectLock<mirror::Class> lock(self, klass); 3823 3824 if (self->IsExceptionPending()) { 3825 WrapExceptionInInitializer(); 3826 klass->SetStatus(mirror::Class::kStatusError, self); 3827 success = false; 3828 } else { 3829 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3830 RuntimeStats* thread_stats = self->GetStats(); 3831 ++global_stats->class_init_count; 3832 ++thread_stats->class_init_count; 3833 global_stats->class_init_time_ns += (t1 - t0); 3834 thread_stats->class_init_time_ns += (t1 - t0); 3835 // Set the class as initialized except if failed to initialize static fields. 3836 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3837 if (VLOG_IS_ON(class_linker)) { 3838 std::string temp; 3839 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3840 klass->GetLocation(); 3841 } 3842 // Opportunistically set static method trampolines to their destination. 3843 FixupStaticTrampolines(klass.Get()); 3844 } 3845 } 3846 return success; 3847} 3848 3849bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3850 ObjectLock<mirror::Class>& lock) 3851 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3852 while (true) { 3853 self->AssertNoPendingException(); 3854 CHECK(!klass->IsInitialized()); 3855 lock.WaitIgnoringInterrupts(); 3856 3857 // When we wake up, repeat the test for init-in-progress. If 3858 // there's an exception pending (only possible if 3859 // "interruptShouldThrow" was set), bail out. 3860 if (self->IsExceptionPending()) { 3861 WrapExceptionInInitializer(); 3862 klass->SetStatus(mirror::Class::kStatusError, self); 3863 return false; 3864 } 3865 // Spurious wakeup? Go back to waiting. 3866 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3867 continue; 3868 } 3869 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3870 // Compile time initialization failed. 3871 return false; 3872 } 3873 if (klass->IsErroneous()) { 3874 // The caller wants an exception, but it was thrown in a 3875 // different thread. Synthesize one here. 3876 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3877 PrettyDescriptor(klass.Get()).c_str()); 3878 return false; 3879 } 3880 if (klass->IsInitialized()) { 3881 return true; 3882 } 3883 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3884 << klass->GetStatus(); 3885 } 3886 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3887} 3888 3889bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3890 if (klass->IsInterface()) { 3891 return true; 3892 } 3893 // Begin with the methods local to the superclass. 3894 StackHandleScope<2> hs(Thread::Current()); 3895 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3896 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3897 if (klass->HasSuperClass() && 3898 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3899 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3900 mh.ChangeMethod(klass->GetVTableEntry(i)); 3901 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3902 if (mh.GetMethod() != super_mh.GetMethod() && 3903 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3904 ThrowLinkageError(klass.Get(), 3905 "Class %s method %s resolves differently in superclass %s", 3906 PrettyDescriptor(klass.Get()).c_str(), 3907 PrettyMethod(mh.GetMethod()).c_str(), 3908 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3909 return false; 3910 } 3911 } 3912 } 3913 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3914 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3915 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3916 for (uint32_t j = 0; j < num_methods; ++j) { 3917 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3918 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3919 if (mh.GetMethod() != super_mh.GetMethod() && 3920 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3921 ThrowLinkageError(klass.Get(), 3922 "Class %s method %s resolves differently in interface %s", 3923 PrettyDescriptor(klass.Get()).c_str(), 3924 PrettyMethod(mh.GetMethod()).c_str(), 3925 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3926 return false; 3927 } 3928 } 3929 } 3930 } 3931 return true; 3932} 3933 3934bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3935 bool can_init_parents) { 3936 DCHECK(c.Get() != nullptr); 3937 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3938 if (!success && can_init_fields && can_init_parents) { 3939 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3940 } 3941 return success; 3942} 3943 3944void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3945 mirror::Class* c, 3946 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3947 const byte* class_data = dex_file.GetClassData(dex_class_def); 3948 ClassDataItemIterator it(dex_file, class_data); 3949 StackHandleScope<2> hs(Thread::Current()); 3950 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3951 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3952 CHECK(!kMovingFields); 3953 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3954 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3955 } 3956} 3957 3958void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3959 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3960 if (fields != nullptr) { 3961 for (int index = 0; index < fields->GetLength(); index ++) { 3962 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3963 fields->Get(index)->SetDeclaringClass(new_class); 3964 } 3965 } 3966 } 3967 3968 fields = new_class->GetSFields(); 3969 if (fields != nullptr) { 3970 for (int index = 0; index < fields->GetLength(); index ++) { 3971 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3972 fields->Get(index)->SetDeclaringClass(new_class); 3973 } 3974 } 3975 } 3976 3977 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3978 if (methods != nullptr) { 3979 for (int index = 0; index < methods->GetLength(); index ++) { 3980 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3981 methods->Get(index)->SetDeclaringClass(new_class); 3982 } 3983 } 3984 } 3985 3986 methods = new_class->GetVirtualMethods(); 3987 if (methods != nullptr) { 3988 for (int index = 0; index < methods->GetLength(); index ++) { 3989 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3990 methods->Get(index)->SetDeclaringClass(new_class); 3991 } 3992 } 3993 } 3994} 3995 3996bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3997 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3998 mirror::Class** new_class) { 3999 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4000 4001 if (!LinkSuperClass(klass)) { 4002 return false; 4003 } 4004 if (!LinkMethods(self, klass, interfaces)) { 4005 return false; 4006 } 4007 if (!LinkInstanceFields(klass)) { 4008 return false; 4009 } 4010 size_t class_size; 4011 if (!LinkStaticFields(klass, &class_size)) { 4012 return false; 4013 } 4014 CreateReferenceInstanceOffsets(klass); 4015 CreateReferenceStaticOffsets(klass); 4016 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4017 4018 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4019 // We don't need to retire this class as it has no embedded tables or it was created the 4020 // correct size during class linker initialization. 4021 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4022 4023 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4024 klass->PopulateEmbeddedImtAndVTable(); 4025 } 4026 4027 // This will notify waiters on klass that saw the not yet resolved 4028 // class in the class_table_ during EnsureResolved. 4029 klass->SetStatus(mirror::Class::kStatusResolved, self); 4030 *new_class = klass.Get(); 4031 } else { 4032 CHECK(!klass->IsResolved()); 4033 // Retire the temporary class and create the correctly sized resolved class. 4034 *new_class = klass->CopyOf(self, class_size); 4035 if (UNLIKELY(*new_class == NULL)) { 4036 CHECK(self->IsExceptionPending()); // Expect an OOME. 4037 klass->SetStatus(mirror::Class::kStatusError, self); 4038 return false; 4039 } 4040 4041 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4042 StackHandleScope<1> hs(self); 4043 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4044 ObjectLock<mirror::Class> lock(self, new_class_h); 4045 4046 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4047 4048 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4049 CHECK(existing == NULL || existing == klass.Get()); 4050 4051 // This will notify waiters on temp class that saw the not yet resolved class in the 4052 // class_table_ during EnsureResolved. 4053 klass->SetStatus(mirror::Class::kStatusRetired, self); 4054 4055 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4056 // This will notify waiters on new_class that saw the not yet resolved 4057 // class in the class_table_ during EnsureResolved. 4058 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4059 } 4060 return true; 4061} 4062 4063bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4064 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4065 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4066 uint16_t super_class_idx = class_def.superclass_idx_; 4067 if (super_class_idx != DexFile::kDexNoIndex16) { 4068 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4069 if (super_class == NULL) { 4070 DCHECK(Thread::Current()->IsExceptionPending()); 4071 return false; 4072 } 4073 // Verify 4074 if (!klass->CanAccess(super_class)) { 4075 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4076 PrettyDescriptor(super_class).c_str(), 4077 PrettyDescriptor(klass.Get()).c_str()); 4078 return false; 4079 } 4080 CHECK(super_class->IsResolved()); 4081 klass->SetSuperClass(super_class); 4082 } 4083 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4084 if (interfaces != NULL) { 4085 for (size_t i = 0; i < interfaces->Size(); i++) { 4086 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4087 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4088 if (interface == NULL) { 4089 DCHECK(Thread::Current()->IsExceptionPending()); 4090 return false; 4091 } 4092 // Verify 4093 if (!klass->CanAccess(interface)) { 4094 // TODO: the RI seemed to ignore this in my testing. 4095 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4096 PrettyDescriptor(interface).c_str(), 4097 PrettyDescriptor(klass.Get()).c_str()); 4098 return false; 4099 } 4100 } 4101 } 4102 // Mark the class as loaded. 4103 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4104 return true; 4105} 4106 4107bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4108 CHECK(!klass->IsPrimitive()); 4109 mirror::Class* super = klass->GetSuperClass(); 4110 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4111 if (super != NULL) { 4112 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4113 return false; 4114 } 4115 return true; 4116 } 4117 if (super == NULL) { 4118 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4119 PrettyDescriptor(klass.Get()).c_str()); 4120 return false; 4121 } 4122 // Verify 4123 if (super->IsFinal() || super->IsInterface()) { 4124 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4125 PrettyDescriptor(super).c_str(), 4126 PrettyDescriptor(klass.Get()).c_str(), 4127 super->IsFinal() ? "declared final" : "an interface"); 4128 return false; 4129 } 4130 if (!klass->CanAccess(super)) { 4131 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4132 PrettyDescriptor(super).c_str(), 4133 PrettyDescriptor(klass.Get()).c_str()); 4134 return false; 4135 } 4136 4137 // Inherit kAccClassIsFinalizable from the superclass in case this 4138 // class doesn't override finalize. 4139 if (super->IsFinalizable()) { 4140 klass->SetFinalizable(); 4141 } 4142 4143 // Inherit reference flags (if any) from the superclass. 4144 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4145 if (reference_flags != 0) { 4146 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4147 } 4148 // Disallow custom direct subclasses of java.lang.ref.Reference. 4149 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4150 ThrowLinkageError(klass.Get(), 4151 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4152 PrettyDescriptor(klass.Get()).c_str()); 4153 return false; 4154 } 4155 4156 if (kIsDebugBuild) { 4157 // Ensure super classes are fully resolved prior to resolving fields.. 4158 while (super != NULL) { 4159 CHECK(super->IsResolved()); 4160 super = super->GetSuperClass(); 4161 } 4162 } 4163 return true; 4164} 4165 4166// Populate the class vtable and itable. Compute return type indices. 4167bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4168 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4169 if (klass->IsInterface()) { 4170 // No vtable. 4171 size_t count = klass->NumVirtualMethods(); 4172 if (!IsUint(16, count)) { 4173 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4174 return false; 4175 } 4176 for (size_t i = 0; i < count; ++i) { 4177 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4178 } 4179 // Link interface method tables 4180 return LinkInterfaceMethods(klass, interfaces); 4181 } else { 4182 // Link virtual and interface method tables 4183 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4184 } 4185 return true; 4186} 4187 4188bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4189 if (klass->HasSuperClass()) { 4190 uint32_t max_count = klass->NumVirtualMethods() + 4191 klass->GetSuperClass()->GetVTableLength(); 4192 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4193 CHECK_LE(actual_count, max_count); 4194 StackHandleScope<4> hs(self); 4195 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4196 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4197 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4198 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4199 if (UNLIKELY(vtable.Get() == nullptr)) { 4200 CHECK(self->IsExceptionPending()); // OOME. 4201 return false; 4202 } 4203 int len = super_class->GetVTableLength(); 4204 for (int i = 0; i < len; i++) { 4205 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4206 } 4207 } else { 4208 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4209 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4210 if (UNLIKELY(vtable.Get() == nullptr)) { 4211 CHECK(self->IsExceptionPending()); // OOME. 4212 return false; 4213 } 4214 } 4215 4216 // See if any of our virtual methods override the superclass. 4217 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4218 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4219 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4220 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4221 local_mh.ChangeMethod(local_method); 4222 size_t j = 0; 4223 for (; j < actual_count; ++j) { 4224 mirror::ArtMethod* super_method = vtable->Get(j); 4225 super_mh.ChangeMethod(super_method); 4226 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4227 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4228 super_method->GetAccessFlags())) { 4229 if (super_method->IsFinal()) { 4230 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4231 PrettyMethod(local_method).c_str(), 4232 super_method->GetDeclaringClassDescriptor()); 4233 return false; 4234 } 4235 vtable->Set<false>(j, local_method); 4236 local_method->SetMethodIndex(j); 4237 break; 4238 } else { 4239 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4240 << " would have incorrectly overridden the package-private method in " 4241 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4242 } 4243 } 4244 } 4245 if (j == actual_count) { 4246 // Not overriding, append. 4247 vtable->Set<false>(actual_count, local_method); 4248 local_method->SetMethodIndex(actual_count); 4249 actual_count += 1; 4250 } 4251 } 4252 if (!IsUint(16, actual_count)) { 4253 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4254 return false; 4255 } 4256 // Shrink vtable if possible 4257 CHECK_LE(actual_count, max_count); 4258 if (actual_count < max_count) { 4259 vtable.Assign(vtable->CopyOf(self, actual_count)); 4260 if (UNLIKELY(vtable.Get() == NULL)) { 4261 CHECK(self->IsExceptionPending()); // OOME. 4262 return false; 4263 } 4264 } 4265 klass->SetVTable(vtable.Get()); 4266 } else { 4267 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4268 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4269 if (!IsUint(16, num_virtual_methods)) { 4270 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4271 return false; 4272 } 4273 StackHandleScope<1> hs(self); 4274 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4275 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4276 if (UNLIKELY(vtable.Get() == NULL)) { 4277 CHECK(self->IsExceptionPending()); // OOME. 4278 return false; 4279 } 4280 for (size_t i = 0; i < num_virtual_methods; ++i) { 4281 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4282 vtable->Set<false>(i, virtual_method); 4283 virtual_method->SetMethodIndex(i & 0xFFFF); 4284 } 4285 klass->SetVTable(vtable.Get()); 4286 } 4287 return true; 4288} 4289 4290bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4291 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4292 Thread* const self = Thread::Current(); 4293 Runtime* const runtime = Runtime::Current(); 4294 // Set the imt table to be all conflicts by default. 4295 klass->SetImTable(runtime->GetDefaultImt()); 4296 size_t super_ifcount; 4297 if (klass->HasSuperClass()) { 4298 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4299 } else { 4300 super_ifcount = 0; 4301 } 4302 uint32_t num_interfaces = 4303 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4304 size_t ifcount = super_ifcount + num_interfaces; 4305 for (size_t i = 0; i < num_interfaces; i++) { 4306 mirror::Class* interface = 4307 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4308 interfaces->Get(i); 4309 ifcount += interface->GetIfTableCount(); 4310 } 4311 if (ifcount == 0) { 4312 // Class implements no interfaces. 4313 DCHECK_EQ(klass->GetIfTableCount(), 0); 4314 DCHECK(klass->GetIfTable() == NULL); 4315 return true; 4316 } 4317 if (ifcount == super_ifcount) { 4318 // Class implements same interfaces as parent, are any of these not marker interfaces? 4319 bool has_non_marker_interface = false; 4320 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4321 for (size_t i = 0; i < ifcount; ++i) { 4322 if (super_iftable->GetMethodArrayCount(i) > 0) { 4323 has_non_marker_interface = true; 4324 break; 4325 } 4326 } 4327 if (!has_non_marker_interface) { 4328 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4329 klass->SetIfTable(super_iftable); 4330 return true; 4331 } 4332 } 4333 StackHandleScope<4> hs(self); 4334 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4335 if (UNLIKELY(iftable.Get() == NULL)) { 4336 CHECK(self->IsExceptionPending()); // OOME. 4337 return false; 4338 } 4339 if (super_ifcount != 0) { 4340 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4341 for (size_t i = 0; i < super_ifcount; i++) { 4342 mirror::Class* super_interface = super_iftable->GetInterface(i); 4343 iftable->SetInterface(i, super_interface); 4344 } 4345 } 4346 // Flatten the interface inheritance hierarchy. 4347 size_t idx = super_ifcount; 4348 for (size_t i = 0; i < num_interfaces; i++) { 4349 mirror::Class* interface = 4350 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4351 interfaces->Get(i); 4352 DCHECK(interface != NULL); 4353 if (!interface->IsInterface()) { 4354 std::string temp; 4355 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4356 PrettyDescriptor(klass.Get()).c_str(), 4357 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4358 return false; 4359 } 4360 // Check if interface is already in iftable 4361 bool duplicate = false; 4362 for (size_t j = 0; j < idx; j++) { 4363 mirror::Class* existing_interface = iftable->GetInterface(j); 4364 if (existing_interface == interface) { 4365 duplicate = true; 4366 break; 4367 } 4368 } 4369 if (!duplicate) { 4370 // Add this non-duplicate interface. 4371 iftable->SetInterface(idx++, interface); 4372 // Add this interface's non-duplicate super-interfaces. 4373 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4374 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4375 bool super_duplicate = false; 4376 for (size_t k = 0; k < idx; k++) { 4377 mirror::Class* existing_interface = iftable->GetInterface(k); 4378 if (existing_interface == super_interface) { 4379 super_duplicate = true; 4380 break; 4381 } 4382 } 4383 if (!super_duplicate) { 4384 iftable->SetInterface(idx++, super_interface); 4385 } 4386 } 4387 } 4388 } 4389 // Shrink iftable in case duplicates were found 4390 if (idx < ifcount) { 4391 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4392 if (UNLIKELY(iftable.Get() == NULL)) { 4393 CHECK(self->IsExceptionPending()); // OOME. 4394 return false; 4395 } 4396 ifcount = idx; 4397 } else { 4398 CHECK_EQ(idx, ifcount); 4399 } 4400 klass->SetIfTable(iftable.Get()); 4401 4402 // If we're an interface, we don't need the vtable pointers, so we're done. 4403 if (klass->IsInterface()) { 4404 return true; 4405 } 4406 // Allocate imtable 4407 bool imtable_changed = false; 4408 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4409 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4410 if (UNLIKELY(imtable.Get() == NULL)) { 4411 CHECK(self->IsExceptionPending()); // OOME. 4412 return false; 4413 } 4414 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4415 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4416 std::vector<mirror::ArtMethod*> miranda_list; 4417 for (size_t i = 0; i < ifcount; ++i) { 4418 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4419 if (num_methods > 0) { 4420 StackHandleScope<2> hs(self); 4421 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4422 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4423 if (UNLIKELY(method_array.Get() == nullptr)) { 4424 CHECK(self->IsExceptionPending()); // OOME. 4425 return false; 4426 } 4427 iftable->SetMethodArray(i, method_array.Get()); 4428 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4429 hs.NewHandle(klass->GetVTableDuringLinking())); 4430 for (size_t j = 0; j < num_methods; ++j) { 4431 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4432 interface_mh.ChangeMethod(interface_method); 4433 int32_t k; 4434 // For each method listed in the interface's method list, find the 4435 // matching method in our class's method list. We want to favor the 4436 // subclass over the superclass, which just requires walking 4437 // back from the end of the vtable. (This only matters if the 4438 // superclass defines a private method and this class redefines 4439 // it -- otherwise it would use the same vtable slot. In .dex files 4440 // those don't end up in the virtual method table, so it shouldn't 4441 // matter which direction we go. We walk it backward anyway.) 4442 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4443 mirror::ArtMethod* vtable_method = vtable->Get(k); 4444 vtable_mh.ChangeMethod(vtable_method); 4445 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4446 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4447 ThrowIllegalAccessError( 4448 klass.Get(), 4449 "Method '%s' implementing interface method '%s' is not public", 4450 PrettyMethod(vtable_method).c_str(), 4451 PrettyMethod(interface_method).c_str()); 4452 return false; 4453 } 4454 method_array->Set<false>(j, vtable_method); 4455 // Place method in imt if entry is empty, place conflict otherwise. 4456 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4457 if (imtable->Get(imt_index) == NULL) { 4458 imtable->Set<false>(imt_index, vtable_method); 4459 imtable_changed = true; 4460 } else { 4461 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4462 } 4463 break; 4464 } 4465 } 4466 if (k < 0) { 4467 StackHandleScope<1> hs(self); 4468 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4469 for (mirror::ArtMethod* mir_method : miranda_list) { 4470 vtable_mh.ChangeMethod(mir_method); 4471 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4472 miranda_method.Assign(mir_method); 4473 break; 4474 } 4475 } 4476 if (miranda_method.Get() == NULL) { 4477 // Point the interface table at a phantom slot. 4478 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4479 if (UNLIKELY(miranda_method.Get() == NULL)) { 4480 CHECK(self->IsExceptionPending()); // OOME. 4481 return false; 4482 } 4483 // TODO: If a methods move then the miranda_list may hold stale references. 4484 miranda_list.push_back(miranda_method.Get()); 4485 } 4486 method_array->Set<false>(j, miranda_method.Get()); 4487 } 4488 } 4489 } 4490 } 4491 if (imtable_changed) { 4492 // Fill in empty entries in interface method table with conflict. 4493 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4494 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4495 if (imtable->Get(i) == NULL) { 4496 imtable->Set<false>(i, imt_conflict_method); 4497 } 4498 } 4499 klass->SetImTable(imtable.Get()); 4500 } 4501 if (!miranda_list.empty()) { 4502 int old_method_count = klass->NumVirtualMethods(); 4503 int new_method_count = old_method_count + miranda_list.size(); 4504 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4505 if (old_method_count == 0) { 4506 virtuals = AllocArtMethodArray(self, new_method_count); 4507 } else { 4508 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4509 } 4510 if (UNLIKELY(virtuals == NULL)) { 4511 CHECK(self->IsExceptionPending()); // OOME. 4512 return false; 4513 } 4514 klass->SetVirtualMethods(virtuals); 4515 4516 StackHandleScope<1> hs(self); 4517 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4518 hs.NewHandle(klass->GetVTableDuringLinking())); 4519 CHECK(vtable.Get() != NULL); 4520 int old_vtable_count = vtable->GetLength(); 4521 int new_vtable_count = old_vtable_count + miranda_list.size(); 4522 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4523 if (UNLIKELY(vtable.Get() == NULL)) { 4524 CHECK(self->IsExceptionPending()); // OOME. 4525 return false; 4526 } 4527 for (size_t i = 0; i < miranda_list.size(); ++i) { 4528 mirror::ArtMethod* method = miranda_list[i]; 4529 // Leave the declaring class alone as type indices are relative to it 4530 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4531 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4532 klass->SetVirtualMethod(old_method_count + i, method); 4533 vtable->Set<false>(old_vtable_count + i, method); 4534 } 4535 // TODO: do not assign to the vtable field until it is fully constructed. 4536 klass->SetVTable(vtable.Get()); 4537 } 4538 4539 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4540 for (int i = 0; i < vtable->GetLength(); ++i) { 4541 CHECK(vtable->Get(i) != NULL); 4542 } 4543 4544// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4545 4546 return true; 4547} 4548 4549bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4550 CHECK(klass.Get() != NULL); 4551 return LinkFields(klass, false, nullptr); 4552} 4553 4554bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4555 CHECK(klass.Get() != NULL); 4556 return LinkFields(klass, true, class_size); 4557} 4558 4559struct LinkFieldsComparator { 4560 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4561 } 4562 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4563 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4564 NO_THREAD_SAFETY_ANALYSIS { 4565 // First come reference fields, then 64-bit, and finally 32-bit 4566 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4567 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4568 if (type1 != type2) { 4569 bool is_primitive1 = type1 != Primitive::kPrimNot; 4570 bool is_primitive2 = type2 != Primitive::kPrimNot; 4571 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4572 type1 == Primitive::kPrimDouble); 4573 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4574 type2 == Primitive::kPrimDouble); 4575 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4576 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4577 if (order1 != order2) { 4578 return order1 < order2; 4579 } 4580 } 4581 // same basic group? then sort by string. 4582 return strcmp(field1->GetName(), field2->GetName()) < 0; 4583 } 4584}; 4585 4586bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4587 size_t num_fields = 4588 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4589 4590 mirror::ObjectArray<mirror::ArtField>* fields = 4591 is_static ? klass->GetSFields() : klass->GetIFields(); 4592 4593 // Initialize field_offset 4594 MemberOffset field_offset(0); 4595 if (is_static) { 4596 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4597 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4598 // Static fields come after the embedded tables. 4599 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4600 0, 0, 0); 4601 } 4602 field_offset = MemberOffset(base); 4603 } else { 4604 mirror::Class* super_class = klass->GetSuperClass(); 4605 if (super_class != NULL) { 4606 CHECK(super_class->IsResolved()) 4607 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4608 field_offset = MemberOffset(super_class->GetObjectSize()); 4609 } 4610 } 4611 4612 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4613 4614 // we want a relatively stable order so that adding new fields 4615 // minimizes disruption of C++ version such as Class and Method. 4616 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4617 for (size_t i = 0; i < num_fields; i++) { 4618 mirror::ArtField* f = fields->Get(i); 4619 CHECK(f != NULL) << PrettyClass(klass.Get()); 4620 grouped_and_sorted_fields.push_back(f); 4621 } 4622 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4623 LinkFieldsComparator()); 4624 4625 // References should be at the front. 4626 size_t current_field = 0; 4627 size_t num_reference_fields = 0; 4628 for (; current_field < num_fields; current_field++) { 4629 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4630 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4631 bool isPrimitive = type != Primitive::kPrimNot; 4632 if (isPrimitive) { 4633 break; // past last reference, move on to the next phase 4634 } 4635 grouped_and_sorted_fields.pop_front(); 4636 num_reference_fields++; 4637 fields->Set<false>(current_field, field); 4638 field->SetOffset(field_offset); 4639 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4640 } 4641 4642 // Now we want to pack all of the double-wide fields together. If 4643 // we're not aligned, though, we want to shuffle one 32-bit field 4644 // into place. If we can't find one, we'll have to pad it. 4645 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4646 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4647 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4648 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4649 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4650 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4651 continue; 4652 } 4653 fields->Set<false>(current_field++, field); 4654 field->SetOffset(field_offset); 4655 // drop the consumed field 4656 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4657 break; 4658 } 4659 // whether we found a 32-bit field for padding or not, we advance 4660 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4661 } 4662 4663 // Alignment is good, shuffle any double-wide fields forward, and 4664 // finish assigning field offsets to all fields. 4665 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4666 << PrettyClass(klass.Get()); 4667 while (!grouped_and_sorted_fields.empty()) { 4668 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4669 grouped_and_sorted_fields.pop_front(); 4670 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4671 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4672 fields->Set<false>(current_field, field); 4673 field->SetOffset(field_offset); 4674 field_offset = MemberOffset(field_offset.Uint32Value() + 4675 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4676 ? sizeof(uint64_t) 4677 : sizeof(uint32_t))); 4678 current_field++; 4679 } 4680 4681 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4682 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4683 // We know there are no non-reference fields in the Reference classes, and we know 4684 // that 'referent' is alphabetically last, so this is easy... 4685 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4686 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4687 --num_reference_fields; 4688 } 4689 4690 if (kIsDebugBuild) { 4691 // Make sure that all reference fields appear before 4692 // non-reference fields, and all double-wide fields are aligned. 4693 bool seen_non_ref = false; 4694 for (size_t i = 0; i < num_fields; i++) { 4695 mirror::ArtField* field = fields->Get(i); 4696 if (false) { // enable to debug field layout 4697 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4698 << " class=" << PrettyClass(klass.Get()) 4699 << " field=" << PrettyField(field) 4700 << " offset=" 4701 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4702 } 4703 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4704 bool is_primitive = type != Primitive::kPrimNot; 4705 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4706 strcmp("referent", field->GetName()) == 0) { 4707 is_primitive = true; // We lied above, so we have to expect a lie here. 4708 } 4709 if (is_primitive) { 4710 if (!seen_non_ref) { 4711 seen_non_ref = true; 4712 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4713 } 4714 } else { 4715 DCHECK(!seen_non_ref) << PrettyField(field); 4716 } 4717 } 4718 if (!seen_non_ref) { 4719 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4720 } 4721 } 4722 4723 size_t size = field_offset.Uint32Value(); 4724 // Update klass 4725 if (is_static) { 4726 klass->SetNumReferenceStaticFields(num_reference_fields); 4727 *class_size = size; 4728 } else { 4729 klass->SetNumReferenceInstanceFields(num_reference_fields); 4730 if (!klass->IsVariableSize()) { 4731 std::string temp; 4732 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4733 size_t previous_size = klass->GetObjectSize(); 4734 if (previous_size != 0) { 4735 // Make sure that we didn't originally have an incorrect size. 4736 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4737 } 4738 klass->SetObjectSize(size); 4739 } 4740 } 4741 return true; 4742} 4743 4744// Set the bitmap of reference offsets, refOffsets, from the ifields 4745// list. 4746void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4747 uint32_t reference_offsets = 0; 4748 mirror::Class* super_class = klass->GetSuperClass(); 4749 if (super_class != NULL) { 4750 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4751 // If our superclass overflowed, we don't stand a chance. 4752 if (reference_offsets == CLASS_WALK_SUPER) { 4753 klass->SetReferenceInstanceOffsets(reference_offsets); 4754 return; 4755 } 4756 } 4757 CreateReferenceOffsets(klass, false, reference_offsets); 4758} 4759 4760void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4761 CreateReferenceOffsets(klass, true, 0); 4762} 4763 4764void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4765 uint32_t reference_offsets) { 4766 size_t num_reference_fields = 4767 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4768 : klass->NumReferenceInstanceFieldsDuringLinking(); 4769 mirror::ObjectArray<mirror::ArtField>* fields = 4770 is_static ? klass->GetSFields() : klass->GetIFields(); 4771 // All of the fields that contain object references are guaranteed 4772 // to be at the beginning of the fields list. 4773 for (size_t i = 0; i < num_reference_fields; ++i) { 4774 // Note that byte_offset is the offset from the beginning of 4775 // object, not the offset into instance data 4776 mirror::ArtField* field = fields->Get(i); 4777 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4778 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4779 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4780 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4781 CHECK_NE(new_bit, 0U); 4782 reference_offsets |= new_bit; 4783 } else { 4784 reference_offsets = CLASS_WALK_SUPER; 4785 break; 4786 } 4787 } 4788 // Update fields in klass 4789 if (is_static) { 4790 klass->SetReferenceStaticOffsets(reference_offsets); 4791 } else { 4792 klass->SetReferenceInstanceOffsets(reference_offsets); 4793 } 4794} 4795 4796mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4797 Handle<mirror::DexCache> dex_cache) { 4798 DCHECK(dex_cache.Get() != nullptr); 4799 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4800 if (resolved != NULL) { 4801 return resolved; 4802 } 4803 uint32_t utf16_length; 4804 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4805 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4806 dex_cache->SetResolvedString(string_idx, string); 4807 return string; 4808} 4809 4810mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4811 mirror::Class* referrer) { 4812 StackHandleScope<2> hs(Thread::Current()); 4813 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4814 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4815 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4816} 4817 4818mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4819 Handle<mirror::DexCache> dex_cache, 4820 Handle<mirror::ClassLoader> class_loader) { 4821 DCHECK(dex_cache.Get() != NULL); 4822 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4823 if (resolved == NULL) { 4824 Thread* self = Thread::Current(); 4825 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4826 resolved = FindClass(self, descriptor, class_loader); 4827 if (resolved != NULL) { 4828 // TODO: we used to throw here if resolved's class loader was not the 4829 // boot class loader. This was to permit different classes with the 4830 // same name to be loaded simultaneously by different loaders 4831 dex_cache->SetResolvedType(type_idx, resolved); 4832 } else { 4833 CHECK(self->IsExceptionPending()) 4834 << "Expected pending exception for failed resolution of: " << descriptor; 4835 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4836 StackHandleScope<1> hs(self); 4837 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4838 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4839 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4840 self->ClearException(); 4841 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4842 self->GetException(NULL)->SetCause(cause.Get()); 4843 } 4844 } 4845 } 4846 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4847 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4848 return resolved; 4849} 4850 4851mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4852 Handle<mirror::DexCache> dex_cache, 4853 Handle<mirror::ClassLoader> class_loader, 4854 Handle<mirror::ArtMethod> referrer, 4855 InvokeType type) { 4856 DCHECK(dex_cache.Get() != NULL); 4857 // Check for hit in the dex cache. 4858 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4859 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4860 return resolved; 4861 } 4862 // Fail, get the declaring class. 4863 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4864 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4865 if (klass == NULL) { 4866 DCHECK(Thread::Current()->IsExceptionPending()); 4867 return NULL; 4868 } 4869 // Scan using method_idx, this saves string compares but will only hit for matching dex 4870 // caches/files. 4871 switch (type) { 4872 case kDirect: // Fall-through. 4873 case kStatic: 4874 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4875 break; 4876 case kInterface: 4877 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4878 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4879 break; 4880 case kSuper: // Fall-through. 4881 case kVirtual: 4882 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4883 break; 4884 default: 4885 LOG(FATAL) << "Unreachable - invocation type: " << type; 4886 } 4887 if (resolved == NULL) { 4888 // Search by name, which works across dex files. 4889 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4890 const Signature signature = dex_file.GetMethodSignature(method_id); 4891 switch (type) { 4892 case kDirect: // Fall-through. 4893 case kStatic: 4894 resolved = klass->FindDirectMethod(name, signature); 4895 break; 4896 case kInterface: 4897 resolved = klass->FindInterfaceMethod(name, signature); 4898 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4899 break; 4900 case kSuper: // Fall-through. 4901 case kVirtual: 4902 resolved = klass->FindVirtualMethod(name, signature); 4903 break; 4904 } 4905 } 4906 if (resolved != NULL) { 4907 // We found a method, check for incompatible class changes. 4908 if (resolved->CheckIncompatibleClassChange(type)) { 4909 resolved = NULL; 4910 } 4911 } 4912 if (resolved != NULL) { 4913 // Be a good citizen and update the dex cache to speed subsequent calls. 4914 dex_cache->SetResolvedMethod(method_idx, resolved); 4915 return resolved; 4916 } else { 4917 // We failed to find the method which means either an access error, an incompatible class 4918 // change, or no such method. First try to find the method among direct and virtual methods. 4919 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4920 const Signature signature = dex_file.GetMethodSignature(method_id); 4921 switch (type) { 4922 case kDirect: 4923 case kStatic: 4924 resolved = klass->FindVirtualMethod(name, signature); 4925 break; 4926 case kInterface: 4927 case kVirtual: 4928 case kSuper: 4929 resolved = klass->FindDirectMethod(name, signature); 4930 break; 4931 } 4932 4933 // If we found something, check that it can be accessed by the referrer. 4934 if (resolved != NULL && referrer.Get() != NULL) { 4935 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4936 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4937 if (!referring_class->CanAccess(methods_class)) { 4938 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4939 resolved, type); 4940 return NULL; 4941 } else if (!referring_class->CanAccessMember(methods_class, 4942 resolved->GetAccessFlags())) { 4943 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4944 return NULL; 4945 } 4946 } 4947 4948 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4949 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4950 switch (type) { 4951 case kDirect: 4952 case kStatic: 4953 if (resolved != NULL) { 4954 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4955 } else { 4956 resolved = klass->FindInterfaceMethod(name, signature); 4957 if (resolved != NULL) { 4958 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4959 } else { 4960 ThrowNoSuchMethodError(type, klass, name, signature); 4961 } 4962 } 4963 break; 4964 case kInterface: 4965 if (resolved != NULL) { 4966 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4967 } else { 4968 resolved = klass->FindVirtualMethod(name, signature); 4969 if (resolved != NULL) { 4970 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4971 } else { 4972 ThrowNoSuchMethodError(type, klass, name, signature); 4973 } 4974 } 4975 break; 4976 case kSuper: 4977 ThrowNoSuchMethodError(type, klass, name, signature); 4978 break; 4979 case kVirtual: 4980 if (resolved != NULL) { 4981 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4982 } else { 4983 resolved = klass->FindInterfaceMethod(name, signature); 4984 if (resolved != NULL) { 4985 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4986 } else { 4987 ThrowNoSuchMethodError(type, klass, name, signature); 4988 } 4989 } 4990 break; 4991 } 4992 DCHECK(Thread::Current()->IsExceptionPending()); 4993 return NULL; 4994 } 4995} 4996 4997mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4998 Handle<mirror::DexCache> dex_cache, 4999 Handle<mirror::ClassLoader> class_loader, 5000 bool is_static) { 5001 DCHECK(dex_cache.Get() != nullptr); 5002 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5003 if (resolved != nullptr) { 5004 return resolved; 5005 } 5006 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5007 Thread* const self = Thread::Current(); 5008 StackHandleScope<1> hs(self); 5009 Handle<mirror::Class> klass( 5010 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5011 if (klass.Get() == nullptr) { 5012 DCHECK(Thread::Current()->IsExceptionPending()); 5013 return nullptr; 5014 } 5015 5016 if (is_static) { 5017 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5018 } else { 5019 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5020 } 5021 5022 if (resolved == nullptr) { 5023 const char* name = dex_file.GetFieldName(field_id); 5024 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5025 if (is_static) { 5026 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5027 } else { 5028 resolved = klass->FindInstanceField(name, type); 5029 } 5030 if (resolved == nullptr) { 5031 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5032 return NULL; 5033 } 5034 } 5035 dex_cache->SetResolvedField(field_idx, resolved); 5036 return resolved; 5037} 5038 5039mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5040 uint32_t field_idx, 5041 Handle<mirror::DexCache> dex_cache, 5042 Handle<mirror::ClassLoader> class_loader) { 5043 DCHECK(dex_cache.Get() != nullptr); 5044 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5045 if (resolved != nullptr) { 5046 return resolved; 5047 } 5048 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5049 Thread* self = Thread::Current(); 5050 StackHandleScope<1> hs(self); 5051 Handle<mirror::Class> klass( 5052 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5053 if (klass.Get() == NULL) { 5054 DCHECK(Thread::Current()->IsExceptionPending()); 5055 return NULL; 5056 } 5057 5058 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5059 StringPiece type(dex_file.StringDataByIdx( 5060 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5061 resolved = mirror::Class::FindField(self, klass, name, type); 5062 if (resolved != NULL) { 5063 dex_cache->SetResolvedField(field_idx, resolved); 5064 } else { 5065 ThrowNoSuchFieldError("", klass.Get(), type, name); 5066 } 5067 return resolved; 5068} 5069 5070const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5071 uint32_t* length) { 5072 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5073 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5074 const DexFile& dex_file = *dex_cache->GetDexFile(); 5075 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5076 return dex_file.GetMethodShorty(method_id, length); 5077} 5078 5079void ClassLinker::DumpAllClasses(int flags) { 5080 if (dex_cache_image_class_lookup_required_) { 5081 MoveImageClassesToClassTable(); 5082 } 5083 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5084 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5085 std::vector<mirror::Class*> all_classes; 5086 { 5087 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5088 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5089 mirror::Class* klass = it.second.Read(); 5090 all_classes.push_back(klass); 5091 } 5092 } 5093 5094 for (size_t i = 0; i < all_classes.size(); ++i) { 5095 all_classes[i]->DumpClass(std::cerr, flags); 5096 } 5097} 5098 5099void ClassLinker::DumpForSigQuit(std::ostream& os) { 5100 if (dex_cache_image_class_lookup_required_) { 5101 MoveImageClassesToClassTable(); 5102 } 5103 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5104 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5105} 5106 5107size_t ClassLinker::NumLoadedClasses() { 5108 if (dex_cache_image_class_lookup_required_) { 5109 MoveImageClassesToClassTable(); 5110 } 5111 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5112 return class_table_.size(); 5113} 5114 5115pid_t ClassLinker::GetClassesLockOwner() { 5116 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5117} 5118 5119pid_t ClassLinker::GetDexLockOwner() { 5120 return dex_lock_.GetExclusiveOwnerTid(); 5121} 5122 5123void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5124 DCHECK(!init_done_); 5125 5126 DCHECK(klass != NULL); 5127 DCHECK(klass->GetClassLoader() == NULL); 5128 5129 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5130 DCHECK(class_roots != NULL); 5131 DCHECK(class_roots->Get(class_root) == NULL); 5132 class_roots->Set<false>(class_root, klass); 5133} 5134 5135} // namespace art 5136