class_linker.cc revision 52be37cb506d3313f3fc5b0afdc5d0322b1191e3
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 <queue> 22#include <string> 23#include <utility> 24#include <vector> 25 26#include "base/casts.h" 27#include "base/logging.h" 28#include "base/scoped_flock.h" 29#include "base/stl_util.h" 30#include "base/unix_file/fd_file.h" 31#include "class_linker-inl.h" 32#include "compiler_callbacks.h" 33#include "debugger.h" 34#include "dex_file-inl.h" 35#include "gc_root-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "method_helper-inl.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "object_lock.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/dex_cache-inl.h" 54#include "mirror/iftable-inl.h" 55#include "mirror/object-inl.h" 56#include "mirror/object_array-inl.h" 57#include "mirror/proxy.h" 58#include "mirror/reference-inl.h" 59#include "mirror/stack_trace_element.h" 60#include "mirror/string-inl.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 std::string temp; 102 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 103 PrettyDescriptor(c).c_str()); 104 } else { 105 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 106 PrettyDescriptor(c).c_str()); 107 } 108} 109 110static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 111 Thread* self = Thread::Current(); 112 JNIEnv* env = self->GetJniEnv(); 113 114 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 115 CHECK(cause.get() != NULL); 116 117 env->ExceptionClear(); 118 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 119 env->Throw(cause.get()); 120 121 // We only wrap non-Error exceptions; an Error can just be used as-is. 122 if (!is_error) { 123 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 124 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 125 } 126} 127 128static size_t Hash(const char* s) { 129 // This is the java.lang.String hashcode for convenience, not interoperability. 130 size_t hash = 0; 131 for (; *s != '\0'; ++s) { 132 hash = hash * 31 + *s; 133 } 134 return hash; 135} 136 137// Gap between two fields in object layout. 138struct FieldGap { 139 uint32_t start_offset; // The offset from the start of the object. 140 uint32_t size; // The gap size of 1, 2, or 4 bytes. 141}; 142struct FieldGapsComparator { 143 explicit FieldGapsComparator() { 144 } 145 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 146 NO_THREAD_SAFETY_ANALYSIS { 147 // Sort by gap size, largest first. 148 return lhs.size > rhs.size; 149 } 150}; 151typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 152 153// Adds largest aligned gaps to queue of gaps. 154void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 155 DCHECK(gaps != nullptr); 156 157 uint32_t current_offset = gap_start; 158 while (current_offset != gap_end) { 159 size_t remaining = gap_end - current_offset; 160 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 161 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 162 current_offset += sizeof(uint32_t); 163 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 164 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 165 current_offset += sizeof(uint16_t); 166 } else { 167 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 168 current_offset += sizeof(uint8_t); 169 } 170 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 171 } 172} 173// Shuffle fields forward, making use of gaps whenever possible. 174template<int n> 175static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 176 MemberOffset* field_offset, 177 mirror::ObjectArray<mirror::ArtField>* fields, 178 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 179 FieldGaps* gaps) 180 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 181 DCHECK(current_field_idx != nullptr); 182 DCHECK(grouped_and_sorted_fields != nullptr); 183 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 184 DCHECK(gaps != nullptr); 185 DCHECK(field_offset != nullptr); 186 187 DCHECK(IsPowerOfTwo(n)); 188 while (!grouped_and_sorted_fields->empty()) { 189 mirror::ArtField* field = grouped_and_sorted_fields->front(); 190 Primitive::Type type = field->GetTypeAsPrimitiveType(); 191 if (Primitive::ComponentSize(type) < n) { 192 break; 193 } 194 if (!IsAligned<n>(field_offset->Uint32Value())) { 195 MemberOffset old_offset = *field_offset; 196 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 197 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 198 } 199 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 200 grouped_and_sorted_fields->pop_front(); 201 fields->Set<false>(*current_field_idx, field); 202 if (!gaps->empty() && gaps->top().size >= n) { 203 FieldGap gap = gaps->top(); 204 gaps->pop(); 205 DCHECK(IsAligned<n>(gap.start_offset)); 206 field->SetOffset(MemberOffset(gap.start_offset)); 207 if (gap.size > n) { 208 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 209 } 210 } else { 211 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 212 field->SetOffset(*field_offset); 213 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 214 } 215 ++(*current_field_idx); 216 } 217} 218 219const char* ClassLinker::class_roots_descriptors_[] = { 220 "Ljava/lang/Class;", 221 "Ljava/lang/Object;", 222 "[Ljava/lang/Class;", 223 "[Ljava/lang/Object;", 224 "Ljava/lang/String;", 225 "Ljava/lang/DexCache;", 226 "Ljava/lang/ref/Reference;", 227 "Ljava/lang/reflect/ArtField;", 228 "Ljava/lang/reflect/ArtMethod;", 229 "Ljava/lang/reflect/Proxy;", 230 "[Ljava/lang/String;", 231 "[Ljava/lang/reflect/ArtField;", 232 "[Ljava/lang/reflect/ArtMethod;", 233 "Ljava/lang/ClassLoader;", 234 "Ljava/lang/Throwable;", 235 "Ljava/lang/ClassNotFoundException;", 236 "Ljava/lang/StackTraceElement;", 237 "Z", 238 "B", 239 "C", 240 "D", 241 "F", 242 "I", 243 "J", 244 "S", 245 "V", 246 "[Z", 247 "[B", 248 "[C", 249 "[D", 250 "[F", 251 "[I", 252 "[J", 253 "[S", 254 "[Ljava/lang/StackTraceElement;", 255}; 256 257ClassLinker::ClassLinker(InternTable* intern_table) 258 // dex_lock_ is recursive as it may be used in stack dumping. 259 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 260 dex_cache_image_class_lookup_required_(false), 261 failed_dex_cache_class_lookups_(0), 262 class_roots_(nullptr), 263 array_iftable_(nullptr), 264 find_array_class_cache_next_victim_(0), 265 init_done_(false), 266 log_new_dex_caches_roots_(false), 267 log_new_class_table_roots_(false), 268 intern_table_(intern_table), 269 portable_resolution_trampoline_(nullptr), 270 quick_resolution_trampoline_(nullptr), 271 portable_imt_conflict_trampoline_(nullptr), 272 quick_imt_conflict_trampoline_(nullptr), 273 quick_generic_jni_trampoline_(nullptr), 274 quick_to_interpreter_bridge_trampoline_(nullptr) { 275 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 276 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 277} 278 279// To set a value for generic JNI. May be necessary in compiler tests. 280extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 281extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 282extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 283extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 284 285void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 286 VLOG(startup) << "ClassLinker::Init"; 287 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 288 289 CHECK(!init_done_); 290 291 // java_lang_Class comes first, it's needed for AllocClass 292 Thread* self = Thread::Current(); 293 gc::Heap* heap = Runtime::Current()->GetHeap(); 294 // The GC can't handle an object with a null class since we can't get the size of this object. 295 heap->IncrementDisableMovingGC(self); 296 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 297 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 298 heap->AllocNonMovableObject<true>(self, nullptr, 299 mirror::Class::ClassClassSize(), 300 VoidFunctor())))); 301 CHECK(java_lang_Class.Get() != NULL); 302 mirror::Class::SetClassClass(java_lang_Class.Get()); 303 java_lang_Class->SetClass(java_lang_Class.Get()); 304 if (kUseBakerOrBrooksReadBarrier) { 305 java_lang_Class->AssertReadBarrierPointer(); 306 } 307 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 308 heap->DecrementDisableMovingGC(self); 309 // AllocClass(mirror::Class*) can now be used 310 311 // Class[] is used for reflection support. 312 Handle<mirror::Class> class_array_class(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 314 class_array_class->SetComponentType(java_lang_Class.Get()); 315 316 // java_lang_Object comes next so that object_array_class can be created. 317 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 318 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 319 CHECK(java_lang_Object.Get() != NULL); 320 // backfill Object as the super class of Class. 321 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 322 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 323 324 // Object[] next to hold class roots. 325 Handle<mirror::Class> object_array_class(hs.NewHandle( 326 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 327 object_array_class->SetComponentType(java_lang_Object.Get()); 328 329 // Setup the char (primitive) class to be used for char[]. 330 Handle<mirror::Class> char_class(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 332 333 // Setup the char[] class to be used for String. 334 Handle<mirror::Class> char_array_class(hs.NewHandle( 335 AllocClass(self, java_lang_Class.Get(), 336 mirror::Array::ClassSize()))); 337 char_array_class->SetComponentType(char_class.Get()); 338 mirror::CharArray::SetArrayClass(char_array_class.Get()); 339 340 // Setup String. 341 Handle<mirror::Class> java_lang_String(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 343 mirror::String::SetClass(java_lang_String.Get()); 344 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 345 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 346 347 // Setup Reference. 348 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 350 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 351 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 352 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 353 354 // Create storage for root classes, save away our work so far (requires descriptors). 355 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 356 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 357 kClassRootsMax)); 358 CHECK(!class_roots_.IsNull()); 359 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 360 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 361 SetClassRoot(kClassArrayClass, class_array_class.Get()); 362 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 363 SetClassRoot(kCharArrayClass, char_array_class.Get()); 364 SetClassRoot(kJavaLangString, java_lang_String.Get()); 365 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 366 367 // Setup the primitive type classes. 368 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 369 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 370 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 371 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 372 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 373 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 374 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 375 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 376 377 // Create array interface entries to populate once we can load system classes. 378 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 379 380 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 381 Handle<mirror::Class> int_array_class(hs.NewHandle( 382 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 383 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 384 mirror::IntArray::SetArrayClass(int_array_class.Get()); 385 SetClassRoot(kIntArrayClass, int_array_class.Get()); 386 387 // now that these are registered, we can use AllocClass() and AllocObjectArray 388 389 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 390 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 392 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 393 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 394 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 395 396 // Constructor, Field, Method, and AbstractMethod are necessary so 397 // that FindClass can link members. 398 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 399 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 400 CHECK(java_lang_reflect_ArtField.Get() != NULL); 401 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 402 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 403 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 404 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 405 406 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 408 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 409 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 410 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 411 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 412 413 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 414 415 // Set up array classes for string, field, method 416 Handle<mirror::Class> object_array_string(hs.NewHandle( 417 AllocClass(self, java_lang_Class.Get(), 418 mirror::ObjectArray<mirror::String>::ClassSize()))); 419 object_array_string->SetComponentType(java_lang_String.Get()); 420 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 421 422 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 423 AllocClass(self, java_lang_Class.Get(), 424 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 425 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 426 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 427 428 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 429 AllocClass(self, java_lang_Class.Get(), 430 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 431 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 432 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 433 434 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 435 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 436 // these roots. 437 CHECK_NE(0U, boot_class_path.size()); 438 for (size_t i = 0; i != boot_class_path.size(); ++i) { 439 const DexFile* dex_file = boot_class_path[i]; 440 CHECK(dex_file != NULL); 441 AppendToBootClassPath(*dex_file); 442 } 443 444 // now we can use FindSystemClass 445 446 // run char class through InitializePrimitiveClass to finish init 447 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 448 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 449 450 // Create runtime resolution and imt conflict methods. Also setup the default imt. 451 Runtime* runtime = Runtime::Current(); 452 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 453 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 454 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 455 456 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 457 // we do not need friend classes or a publicly exposed setter. 458 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 459 if (!runtime->IsCompiler()) { 460 // We need to set up the generic trampolines since we don't have an image. 461 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 462 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 463 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 464 } 465 466 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 467 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 468 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 469 CHECK_EQ(java_lang_Object.Get(), Object_class); 470 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 471 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 472 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 473 std::ostringstream os1, os2; 474 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 475 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 476 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 477 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 478 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 479 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 480 CHECK_EQ(java_lang_String.Get(), String_class); 481 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 482 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 483 484 // Setup the primitive array type classes - can't be done until Object has a vtable. 485 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 486 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 487 488 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 489 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 490 491 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 492 CHECK_EQ(char_array_class.Get(), found_char_array_class); 493 494 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 495 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 496 497 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 498 CHECK_EQ(int_array_class.Get(), found_int_array_class); 499 500 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 501 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 502 503 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 504 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 505 506 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 507 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 508 509 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 510 CHECK_EQ(class_array_class.Get(), found_class_array_class); 511 512 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 513 CHECK_EQ(object_array_class.Get(), found_object_array_class); 514 515 // Setup the single, global copy of "iftable". 516 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 517 CHECK(java_lang_Cloneable != NULL); 518 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 519 CHECK(java_io_Serializable != NULL); 520 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 521 // crawl up and explicitly list all of the supers as well. 522 { 523 mirror::IfTable* array_iftable = array_iftable_.Read(); 524 array_iftable->SetInterface(0, java_lang_Cloneable); 525 array_iftable->SetInterface(1, java_io_Serializable); 526 } 527 528 // Sanity check Class[] and Object[]'s interfaces. 529 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 530 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 531 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 532 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 533 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 534 // dex_cache_ fields and register them in class_table_. 535 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 536 CHECK_EQ(java_lang_Class.Get(), Class_class); 537 538 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 539 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 540 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 541 542 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 543 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 544 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 545 546 mirror::Class* String_array_class = 547 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 548 CHECK_EQ(object_array_string.Get(), String_array_class); 549 550 mirror::Class* Art_method_array_class = 551 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 552 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 553 554 mirror::Class* Art_field_array_class = 555 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 556 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 557 558 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 559 560 // Create java.lang.reflect.Proxy root. 561 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 562 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 563 564 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 565 // finish initializing Reference class 566 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 567 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 568 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 569 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 570 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 571 mirror::Class* java_lang_ref_FinalizerReference = 572 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 573 java_lang_ref_FinalizerReference->SetAccessFlags( 574 java_lang_ref_FinalizerReference->GetAccessFlags() | 575 kAccClassIsReference | kAccClassIsFinalizerReference); 576 mirror::Class* java_lang_ref_PhantomReference = 577 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 578 java_lang_ref_PhantomReference->SetAccessFlags( 579 java_lang_ref_PhantomReference->GetAccessFlags() | 580 kAccClassIsReference | kAccClassIsPhantomReference); 581 mirror::Class* java_lang_ref_SoftReference = 582 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 583 java_lang_ref_SoftReference->SetAccessFlags( 584 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 585 mirror::Class* java_lang_ref_WeakReference = 586 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 587 java_lang_ref_WeakReference->SetAccessFlags( 588 java_lang_ref_WeakReference->GetAccessFlags() | 589 kAccClassIsReference | kAccClassIsWeakReference); 590 591 // Setup the ClassLoader, verifying the object_size_. 592 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 593 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 594 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 595 596 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 597 // java.lang.StackTraceElement as a convenience. 598 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 599 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 600 SetClassRoot(kJavaLangClassNotFoundException, 601 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 602 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 603 SetClassRoot(kJavaLangStackTraceElementArrayClass, 604 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 605 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 606 607 FinishInit(self); 608 609 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 610} 611 612void ClassLinker::FinishInit(Thread* self) { 613 VLOG(startup) << "ClassLinker::FinishInit entering"; 614 615 // Let the heap know some key offsets into java.lang.ref instances 616 // Note: we hard code the field indexes here rather than using FindInstanceField 617 // as the types of the field can't be resolved prior to the runtime being 618 // fully initialized 619 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 620 mirror::Class* java_lang_ref_FinalizerReference = 621 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 622 623 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 624 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 625 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 626 627 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 628 CHECK_STREQ(queue->GetName(), "queue"); 629 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 630 631 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 632 CHECK_STREQ(queueNext->GetName(), "queueNext"); 633 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 634 635 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 636 CHECK_STREQ(referent->GetName(), "referent"); 637 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 638 639 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 640 CHECK_STREQ(zombie->GetName(), "zombie"); 641 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 642 643 // ensure all class_roots_ are initialized 644 for (size_t i = 0; i < kClassRootsMax; i++) { 645 ClassRoot class_root = static_cast<ClassRoot>(i); 646 mirror::Class* klass = GetClassRoot(class_root); 647 CHECK(klass != NULL); 648 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 649 // note SetClassRoot does additional validation. 650 // if possible add new checks there to catch errors early 651 } 652 653 CHECK(!array_iftable_.IsNull()); 654 655 // disable the slow paths in FindClass and CreatePrimitiveClass now 656 // that Object, Class, and Object[] are setup 657 init_done_ = true; 658 659 VLOG(startup) << "ClassLinker::FinishInit exiting"; 660} 661 662void ClassLinker::RunRootClinits() { 663 Thread* self = Thread::Current(); 664 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 665 mirror::Class* c = GetClassRoot(ClassRoot(i)); 666 if (!c->IsArrayClass() && !c->IsPrimitive()) { 667 StackHandleScope<1> hs(self); 668 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 669 EnsureInitialized(h_class, true, true); 670 self->AssertNoPendingException(); 671 } 672 } 673} 674 675bool ClassLinker::GenerateOatFile(const char* dex_filename, 676 int oat_fd, 677 const char* oat_cache_filename, 678 std::string* error_msg) { 679 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 680 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 681 682 gc::Heap* heap = Runtime::Current()->GetHeap(); 683 std::string boot_image_option("--boot-image="); 684 if (heap->GetImageSpace() == nullptr) { 685 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 686 // out of space anyway it might not matter. 687 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 688 "without an image.", dex_filename); 689 return false; 690 } 691 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 692 693 std::string dex_file_option("--dex-file="); 694 dex_file_option += dex_filename; 695 696 std::string oat_fd_option("--oat-fd="); 697 StringAppendF(&oat_fd_option, "%d", oat_fd); 698 699 std::string oat_location_option("--oat-location="); 700 oat_location_option += oat_cache_filename; 701 702 std::vector<std::string> argv; 703 argv.push_back(dex2oat); 704 argv.push_back("--runtime-arg"); 705 argv.push_back("-classpath"); 706 argv.push_back("--runtime-arg"); 707 argv.push_back(Runtime::Current()->GetClassPathString()); 708 709 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 710 711 if (!Runtime::Current()->IsVerificationEnabled()) { 712 argv.push_back("--compiler-filter=verify-none"); 713 } 714 715 if (Runtime::Current()->MustRelocateIfPossible()) { 716 argv.push_back("--runtime-arg"); 717 argv.push_back("-Xrelocate"); 718 } else { 719 argv.push_back("--runtime-arg"); 720 argv.push_back("-Xnorelocate"); 721 } 722 723 if (!kIsTargetBuild) { 724 argv.push_back("--host"); 725 } 726 727 argv.push_back(boot_image_option); 728 argv.push_back(dex_file_option); 729 argv.push_back(oat_fd_option); 730 argv.push_back(oat_location_option); 731 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 732 for (size_t i = 0; i < compiler_options.size(); ++i) { 733 argv.push_back(compiler_options[i].c_str()); 734 } 735 736 return Exec(argv, error_msg); 737} 738 739const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 740 WriterMutexLock mu(Thread::Current(), dex_lock_); 741 if (kIsDebugBuild) { 742 for (size_t i = 0; i < oat_files_.size(); ++i) { 743 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 744 } 745 } 746 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 747 oat_files_.push_back(oat_file); 748 return oat_file; 749} 750 751OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 752 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 753 OatFile* oat_file = space->ReleaseOatFile(); 754 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 755 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 756 return *oat_file; 757} 758 759const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 760 const char* dex_location = dex_file.GetLocation().c_str(); 761 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 762 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 763} 764 765const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 766 const char* dex_location, 767 const uint32_t* dex_location_checksum) { 768 ReaderMutexLock mu(Thread::Current(), dex_lock_); 769 for (const OatFile* oat_file : oat_files_) { 770 DCHECK(oat_file != nullptr); 771 772 if (oat_location != nullptr) { 773 if (oat_file->GetLocation() != oat_location) { 774 continue; 775 } 776 } 777 778 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 779 dex_location_checksum, 780 false); 781 if (oat_dex_file != nullptr) { 782 return oat_dex_file; 783 } 784 } 785 return nullptr; 786} 787 788 789// Loads all multi dex files from the given oat file returning true on success. 790// 791// Parameters: 792// oat_file - the oat file to load from 793// dex_location - the dex location used to generate the oat file 794// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 795// generated - whether or not the oat_file existed before or was just (re)generated 796// error_msgs - any error messages will be appended here 797// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 798static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 799 const char* dex_location, 800 const uint32_t* dex_location_checksum, 801 bool generated, 802 std::vector<std::string>* error_msgs, 803 std::vector<const DexFile*>* dex_files) { 804 if (oat_file == nullptr) { 805 return false; 806 } 807 808 size_t old_size = dex_files->size(); // To rollback on error. 809 810 bool success = true; 811 for (size_t i = 0; success; ++i) { 812 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 813 const char* next_name = next_name_str.c_str(); 814 815 uint32_t next_location_checksum; 816 uint32_t* next_location_checksum_pointer = &next_location_checksum; 817 std::string error_msg; 818 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 819 // When i=0 the multidex name should be the same as the location name. We already have the 820 // checksum it so we don't need to recompute it. 821 if (dex_location_checksum == nullptr) { 822 next_location_checksum_pointer = nullptr; 823 } else { 824 next_location_checksum = *dex_location_checksum; 825 } 826 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 827 DCHECK_EQ(false, i == 0 && generated); 828 next_location_checksum_pointer = nullptr; 829 } 830 831 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 832 833 if (oat_dex_file == nullptr) { 834 if (i == 0 && generated) { 835 std::string error_msg; 836 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 837 " file'%s'", dex_location, next_location_checksum, 838 oat_file->GetLocation().c_str()); 839 error_msgs->push_back(error_msg); 840 } 841 break; // Not found, done. 842 } 843 844 // Checksum test. Test must succeed when generated. 845 success = !generated; 846 if (next_location_checksum_pointer != nullptr) { 847 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 848 } 849 850 if (success) { 851 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 852 if (dex_file == nullptr) { 853 success = false; 854 error_msgs->push_back(error_msg); 855 } else { 856 dex_files->push_back(dex_file); 857 } 858 } 859 860 // When we generated the file, we expect success, or something is terribly wrong. 861 CHECK_EQ(false, generated && !success) 862 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 863 << std::hex << " dex_location_checksum=" << next_location_checksum 864 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 865 } 866 867 if (dex_files->size() == old_size) { 868 success = false; // We did not even find classes.dex 869 } 870 871 if (success) { 872 return true; 873 } else { 874 // Free all the dex files we have loaded. 875 auto it = dex_files->begin() + old_size; 876 auto it_end = dex_files->end(); 877 for (; it != it_end; it++) { 878 delete *it; 879 } 880 dex_files->erase(dex_files->begin() + old_size, it_end); 881 882 return false; 883 } 884} 885 886// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 887// complicates the loading process, as we should not use an iterative loading process, because that 888// would register the oat file and dex files that come before the broken one. Instead, check all 889// multidex ahead of time. 890bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 891 std::vector<std::string>* error_msgs, 892 std::vector<const DexFile*>* dex_files) { 893 // 1) Check whether we have an open oat file. 894 // This requires a dex checksum, use the "primary" one. 895 uint32_t dex_location_checksum; 896 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 897 bool have_checksum = true; 898 std::string checksum_error_msg; 899 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 900 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 901 dex_location_checksum_pointer = nullptr; 902 have_checksum = false; 903 } 904 905 bool needs_registering = false; 906 907 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 908 dex_location_checksum_pointer); 909 std::unique_ptr<const OatFile> open_oat_file( 910 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 911 912 // 2) If we do not have an open one, maybe there's one on disk already. 913 914 // In case the oat file is not open, we play a locking game here so 915 // that if two different processes race to load and register or generate 916 // (or worse, one tries to open a partial generated file) we will be okay. 917 // This is actually common with apps that use DexClassLoader to work 918 // around the dex method reference limit and that have a background 919 // service running in a separate process. 920 ScopedFlock scoped_flock; 921 922 if (open_oat_file.get() == nullptr) { 923 if (oat_location != nullptr) { 924 // Can only do this if we have a checksum, else error. 925 if (!have_checksum) { 926 error_msgs->push_back(checksum_error_msg); 927 return false; 928 } 929 930 std::string error_msg; 931 932 // We are loading or creating one in the future. Time to set up the file lock. 933 if (!scoped_flock.Init(oat_location, &error_msg)) { 934 error_msgs->push_back(error_msg); 935 return false; 936 } 937 938 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 939 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 940 oat_location, &error_msg)); 941 942 if (open_oat_file.get() == nullptr) { 943 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 944 dex_location, oat_location, error_msg.c_str()); 945 VLOG(class_linker) << compound_msg; 946 error_msgs->push_back(compound_msg); 947 } 948 } else { 949 // TODO: What to lock here? 950 bool obsolete_file_cleanup_failed; 951 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 952 dex_location_checksum_pointer, 953 kRuntimeISA, error_msgs, 954 &obsolete_file_cleanup_failed)); 955 // There's no point in going forward and eventually try to regenerate the 956 // file if we couldn't remove the obsolete one. Mostly likely we will fail 957 // with the same error when trying to write the new file. 958 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 959 if (obsolete_file_cleanup_failed) { 960 return false; 961 } 962 } 963 needs_registering = true; 964 } 965 966 // 3) If we have an oat file, check all contained multidex files for our dex_location. 967 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 968 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 969 dex_location_checksum_pointer, 970 false, error_msgs, dex_files); 971 if (success) { 972 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 973 if (needs_registering) { 974 // We opened the oat file, so we must register it. 975 RegisterOatFile(oat_file); 976 } 977 // If the file isn't executable we failed patchoat but did manage to get the dex files. 978 return oat_file->IsExecutable(); 979 } else { 980 if (needs_registering) { 981 // We opened it, delete it. 982 open_oat_file.reset(); 983 } else { 984 open_oat_file.release(); // Do not delete open oat files. 985 } 986 } 987 988 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 989 990 // Need a checksum, fail else. 991 if (!have_checksum) { 992 error_msgs->push_back(checksum_error_msg); 993 return false; 994 } 995 996 // Look in cache location if no oat_location is given. 997 std::string cache_location; 998 if (oat_location == nullptr) { 999 // Use the dalvik cache. 1000 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1001 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 1002 oat_location = cache_location.c_str(); 1003 } 1004 1005 bool has_flock = true; 1006 // Definitely need to lock now. 1007 if (!scoped_flock.HasFile()) { 1008 std::string error_msg; 1009 if (!scoped_flock.Init(oat_location, &error_msg)) { 1010 error_msgs->push_back(error_msg); 1011 has_flock = false; 1012 } 1013 } 1014 1015 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1016 // Create the oat file. 1017 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1018 oat_location, error_msgs)); 1019 } 1020 1021 // Failed, bail. 1022 if (open_oat_file.get() == nullptr) { 1023 std::string error_msg; 1024 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1025 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1026 error_msgs->push_back(error_msg); 1027 return false; 1028 } 1029 1030 // Try to load again, but stronger checks. 1031 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1032 dex_location_checksum_pointer, 1033 true, error_msgs, dex_files); 1034 if (success) { 1035 RegisterOatFile(open_oat_file.release()); 1036 return true; 1037 } else { 1038 return false; 1039 } 1040} 1041 1042const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1043 uint32_t dex_location_checksum, 1044 const char* oat_location, 1045 std::string* error_msg) { 1046 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1047 !Runtime::Current()->IsCompiler(), 1048 error_msg)); 1049 if (oat_file.get() == nullptr) { 1050 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1051 error_msg->c_str()); 1052 return nullptr; 1053 } 1054 Runtime* runtime = Runtime::Current(); 1055 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1056 if (image_space != nullptr) { 1057 const ImageHeader& image_header = image_space->GetImageHeader(); 1058 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1059 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1060 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1061 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1062 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1063 actual_image_oat_checksum); 1064 return nullptr; 1065 } 1066 1067 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1068 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1069 if (expected_image_oat_offset != actual_image_oat_offset) { 1070 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1071 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1072 actual_image_oat_offset); 1073 return nullptr; 1074 } 1075 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1076 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1077 if (expected_patch_delta != actual_patch_delta) { 1078 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1079 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1080 return nullptr; 1081 } 1082 } 1083 1084 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1085 &dex_location_checksum); 1086 if (oat_dex_file == nullptr) { 1087 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1088 dex_location); 1089 return nullptr; 1090 } 1091 uint32_t expected_dex_checksum = dex_location_checksum; 1092 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1093 if (expected_dex_checksum != actual_dex_checksum) { 1094 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1095 "found 0x%x", oat_location, expected_dex_checksum, 1096 actual_dex_checksum); 1097 return nullptr; 1098 } 1099 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1100 if (dex_file.get() != nullptr) { 1101 return oat_file.release(); 1102 } else { 1103 return nullptr; 1104 } 1105} 1106 1107const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1108 int fd, const char* oat_location, 1109 std::vector<std::string>* error_msgs) { 1110 // Generate the output oat file for the dex file 1111 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1112 std::string error_msg; 1113 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1114 CHECK(!error_msg.empty()); 1115 error_msgs->push_back(error_msg); 1116 return nullptr; 1117 } 1118 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1119 !Runtime::Current()->IsCompiler(), 1120 &error_msg)); 1121 if (oat_file.get() == nullptr) { 1122 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1123 oat_location, error_msg.c_str()); 1124 error_msgs->push_back(compound_msg); 1125 return nullptr; 1126 } 1127 1128 return oat_file.release(); 1129} 1130 1131bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1132 const InstructionSet instruction_set) { 1133 Runtime* runtime = Runtime::Current(); 1134 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1135 if (image_space == nullptr) { 1136 return false; 1137 } 1138 uint32_t image_oat_checksum = 0; 1139 if (instruction_set == kRuntimeISA) { 1140 const ImageHeader& image_header = image_space->GetImageHeader(); 1141 image_oat_checksum = image_header.GetOatChecksum(); 1142 } else { 1143 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1144 image_space->GetImageLocation().c_str(), instruction_set)); 1145 image_oat_checksum = image_header->GetOatChecksum(); 1146 } 1147 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1148} 1149 1150bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1151 const InstructionSet instruction_set, 1152 std::string* error_msg) { 1153 Runtime* runtime = Runtime::Current(); 1154 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1155 if (image_space == nullptr) { 1156 *error_msg = "No image space for verification against"; 1157 return false; 1158 } 1159 1160 // If the requested instruction set is the same as the current runtime, 1161 // we can use the checksums directly. If it isn't, we'll have to read the 1162 // image header from the image for the right instruction set. 1163 uint32_t image_oat_checksum = 0; 1164 uintptr_t image_oat_data_begin = 0; 1165 int32_t image_patch_delta = 0; 1166 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1167 const ImageHeader& image_header = image_space->GetImageHeader(); 1168 image_oat_checksum = image_header.GetOatChecksum(); 1169 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1170 image_patch_delta = image_header.GetPatchDelta(); 1171 } else { 1172 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1173 image_space->GetImageLocation().c_str(), instruction_set)); 1174 image_oat_checksum = image_header->GetOatChecksum(); 1175 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1176 image_patch_delta = image_header->GetPatchDelta(); 1177 } 1178 const OatHeader& oat_header = oat_file->GetOatHeader(); 1179 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1180 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1181 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1182 if (!ret) { 1183 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1184 oat_file->GetLocation().c_str(), 1185 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1186 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1187 oat_file->GetOatHeader().GetImagePatchDelta(), 1188 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1189 } 1190 return ret; 1191} 1192 1193bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1194 const char* dex_location, 1195 uint32_t dex_location_checksum, 1196 const InstructionSet instruction_set, 1197 std::string* error_msg) { 1198 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1199 return false; 1200 } 1201 1202 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1203 &dex_location_checksum); 1204 if (oat_dex_file == NULL) { 1205 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1206 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1207 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1208 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1209 oat_file->GetLocation().c_str(), 1210 oat_dex_file->GetDexFileLocation().c_str(), 1211 oat_dex_file->GetDexFileLocationChecksum()); 1212 } 1213 return false; 1214 } 1215 1216 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1217 return true; 1218} 1219 1220bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1221 const char* dex_location, 1222 const uint32_t* dex_location_checksum, 1223 std::string* error_msg) { 1224 CHECK(oat_file != nullptr); 1225 CHECK(dex_location != nullptr); 1226 std::unique_ptr<const DexFile> dex_file; 1227 if (dex_location_checksum == nullptr) { 1228 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1229 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1230 // directory. 1231 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1232 if (oat_dex_file == nullptr) { 1233 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1234 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1235 error_msg->c_str()); 1236 return false; 1237 } 1238 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1239 } else { 1240 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1241 kRuntimeISA, error_msg); 1242 if (!verified) { 1243 return false; 1244 } 1245 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1246 dex_location_checksum)->OpenDexFile(error_msg)); 1247 } 1248 return dex_file.get() != nullptr; 1249} 1250 1251const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1252 const char* dex_location, 1253 const uint32_t* dex_location_checksum, 1254 InstructionSet isa, 1255 std::vector<std::string>* error_msgs, 1256 bool* obsolete_file_cleanup_failed) { 1257 *obsolete_file_cleanup_failed = false; 1258 bool already_opened = false; 1259 std::string dex_location_str(dex_location); 1260 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1261 &already_opened, 1262 obsolete_file_cleanup_failed, 1263 error_msgs)); 1264 std::string error_msg; 1265 if (oat_file.get() == nullptr) { 1266 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1267 dex_location)); 1268 return nullptr; 1269 } else if (oat_file->IsExecutable() && 1270 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1271 dex_location_checksum, &error_msg)) { 1272 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1273 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1274 error_msg.c_str())); 1275 return nullptr; 1276 } else if (!oat_file->IsExecutable() && 1277 Runtime::Current()->GetHeap()->HasImageSpace() && 1278 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1279 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1280 "dex location '%s'. Image checksum incorrect.", 1281 oat_file->GetLocation().c_str(), dex_location)); 1282 return nullptr; 1283 } else { 1284 return oat_file.release(); 1285 } 1286} 1287 1288const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1289 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1290 for (size_t i = 0; i < oat_files_.size(); i++) { 1291 const OatFile* oat_file = oat_files_[i]; 1292 DCHECK(oat_file != nullptr); 1293 if (oat_file->GetLocation() == oat_location) { 1294 return oat_file; 1295 } 1296 } 1297 return nullptr; 1298} 1299 1300const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1301 InstructionSet isa, 1302 bool *already_opened, 1303 bool *obsolete_file_cleanup_failed, 1304 std::vector<std::string>* error_msgs) { 1305 // Find out if we've already opened the file 1306 const OatFile* ret = nullptr; 1307 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1308 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1309 if (ret != nullptr) { 1310 *already_opened = true; 1311 return ret; 1312 } 1313 1314 std::string dalvik_cache; 1315 bool have_android_data = false; 1316 bool have_dalvik_cache = false; 1317 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1318 &have_android_data, &have_dalvik_cache); 1319 std::string cache_filename; 1320 if (have_dalvik_cache) { 1321 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1322 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1323 if (ret != nullptr) { 1324 *already_opened = true; 1325 return ret; 1326 } 1327 } else { 1328 // If we need to relocate we should just place odex back where it started. 1329 cache_filename = odex_filename; 1330 } 1331 1332 ret = nullptr; 1333 1334 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1335 // 1336 // Now we do the following: 1337 // 1) Try and open the odex version 1338 // 2) If present, checksum-verified & relocated correctly return it 1339 // 3) Close the odex version to free up its address space. 1340 // 4) Try and open the cache version 1341 // 5) If present, checksum-verified & relocated correctly return it 1342 // 6) Close the cache version to free up its address space. 1343 // 7) If we should relocate: 1344 // a) If we have opened and checksum-verified the odex version relocate it to 1345 // 'cache_filename' and return it 1346 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1347 // it. This should not happen often (I think only the run-test's will hit this case). 1348 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1349 // this point. 1350 // 9) Return nullptr 1351 1352 *already_opened = false; 1353 const Runtime* runtime = Runtime::Current(); 1354 CHECK(runtime != nullptr); 1355 bool executable = !runtime->IsCompiler(); 1356 1357 std::string odex_error_msg; 1358 bool should_patch_system = false; 1359 bool odex_checksum_verified = false; 1360 bool have_system_odex = false; 1361 { 1362 // There is a high probability that these both these oat files map similar/the same address 1363 // spaces so we must scope them like this so they each gets its turn. 1364 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1365 executable, &odex_error_msg)); 1366 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1367 &odex_checksum_verified, 1368 &odex_error_msg)) { 1369 return odex_oat_file.release(); 1370 } else { 1371 if (odex_checksum_verified) { 1372 // We can just relocate 1373 should_patch_system = true; 1374 odex_error_msg = "Image Patches are incorrect"; 1375 } 1376 if (odex_oat_file.get() != nullptr) { 1377 have_system_odex = true; 1378 } 1379 } 1380 } 1381 1382 std::string cache_error_msg; 1383 bool should_patch_cache = false; 1384 bool cache_checksum_verified = false; 1385 if (have_dalvik_cache) { 1386 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1387 executable, &cache_error_msg)); 1388 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1389 &cache_checksum_verified, 1390 &cache_error_msg)) { 1391 return cache_oat_file.release(); 1392 } else if (cache_checksum_verified) { 1393 // We can just relocate 1394 should_patch_cache = true; 1395 cache_error_msg = "Image Patches are incorrect"; 1396 } 1397 } else if (have_android_data) { 1398 // dalvik_cache does not exist but android data does. This means we should be able to create 1399 // it, so we should try. 1400 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1401 } 1402 1403 ret = nullptr; 1404 std::string error_msg; 1405 if (runtime->CanRelocate()) { 1406 // Run relocation 1407 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1408 if (space != nullptr) { 1409 const std::string& image_location = space->GetImageLocation(); 1410 if (odex_checksum_verified && should_patch_system) { 1411 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1412 } else if (cache_checksum_verified && should_patch_cache) { 1413 CHECK(have_dalvik_cache); 1414 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1415 } 1416 } else if (have_system_odex) { 1417 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1418 } 1419 } 1420 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1421 // implicitly: were able to fine where the cached version is but we were unable to use it, 1422 // either as a destination for relocation or to open a file. We should delete it if it is 1423 // there. 1424 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1425 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1426 "searching for dex file %s: %s", 1427 cache_filename.c_str(), dex_location.c_str(), 1428 strerror(errno)); 1429 error_msgs->push_back(rm_error_msg); 1430 VLOG(class_linker) << rm_error_msg; 1431 // Let the caller know that we couldn't remove the obsolete file. 1432 // This is a good indication that further writes may fail as well. 1433 *obsolete_file_cleanup_failed = true; 1434 } 1435 } 1436 if (ret == nullptr) { 1437 VLOG(class_linker) << error_msg; 1438 error_msgs->push_back(error_msg); 1439 std::string relocation_msg; 1440 if (runtime->CanRelocate()) { 1441 relocation_msg = StringPrintf(" and relocation failed"); 1442 } 1443 if (have_dalvik_cache && cache_checksum_verified) { 1444 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1445 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1446 cache_filename.c_str(), cache_error_msg.c_str(), 1447 relocation_msg.c_str()); 1448 } else { 1449 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1450 "dalvik_cache availible)%s.", odex_filename.c_str(), 1451 odex_error_msg.c_str(), relocation_msg.c_str()); 1452 } 1453 VLOG(class_linker) << error_msg; 1454 error_msgs->push_back(error_msg); 1455 } 1456 return ret; 1457} 1458 1459const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1460 InstructionSet isa, 1461 std::string* error_msg) { 1462 // We open it non-executable 1463 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1464 if (output.get() == nullptr) { 1465 return nullptr; 1466 } 1467 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1468 VerifyOatImageChecksum(output.get(), isa)) { 1469 return output.release(); 1470 } else { 1471 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1472 oat_path.c_str()); 1473 return nullptr; 1474 } 1475} 1476 1477const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1478 const std::string& output_oat, 1479 const std::string& image_location, 1480 InstructionSet isa, 1481 std::string* error_msg) { 1482 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1483 // We don't have an image space so there is no point in trying to patchoat. 1484 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1485 << "running without an image. Attempting to use oat file for interpretation."; 1486 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1487 } 1488 if (!Runtime::Current()->IsDex2OatEnabled()) { 1489 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1490 // input_oat but make sure we only do interpretation on it's dex files. 1491 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1492 << "disabled. Attempting to use oat file for interpretation"; 1493 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1494 } 1495 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1496 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1497 1498 std::string isa_arg("--instruction-set="); 1499 isa_arg += GetInstructionSetString(isa); 1500 std::string input_oat_filename_arg("--input-oat-file="); 1501 input_oat_filename_arg += input_oat; 1502 std::string output_oat_filename_arg("--output-oat-file="); 1503 output_oat_filename_arg += output_oat; 1504 std::string patched_image_arg("--patched-image-location="); 1505 patched_image_arg += image_location; 1506 1507 std::vector<std::string> argv; 1508 argv.push_back(patchoat); 1509 argv.push_back(isa_arg); 1510 argv.push_back(input_oat_filename_arg); 1511 argv.push_back(output_oat_filename_arg); 1512 argv.push_back(patched_image_arg); 1513 1514 std::string command_line(Join(argv, ' ')); 1515 LOG(INFO) << "Relocate Oat File: " << command_line; 1516 bool success = Exec(argv, error_msg); 1517 if (success) { 1518 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1519 !Runtime::Current()->IsCompiler(), error_msg)); 1520 bool checksum_verified = false; 1521 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1522 return output.release(); 1523 } else if (output.get() != nullptr) { 1524 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1525 "but output file '%s' failed verifcation: %s", 1526 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1527 } else { 1528 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1529 "but was unable to open output file '%s': %s", 1530 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1531 } 1532 } else if (!Runtime::Current()->IsCompiler()) { 1533 // patchoat failed which means we probably don't have enough room to place the output oat file, 1534 // instead of failing we should just run the interpreter from the dex files in the input oat. 1535 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1536 << "for interpretation. patchoat failure was: " << *error_msg; 1537 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1538 } else { 1539 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1540 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1541 error_msg->c_str()); 1542 } 1543 return nullptr; 1544} 1545 1546int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1547 Runtime* runtime = Runtime::Current(); 1548 int32_t real_patch_delta; 1549 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1550 CHECK(image_space != nullptr); 1551 if (isa == Runtime::Current()->GetInstructionSet()) { 1552 const ImageHeader& image_header = image_space->GetImageHeader(); 1553 real_patch_delta = image_header.GetPatchDelta(); 1554 } else { 1555 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1556 image_space->GetImageLocation().c_str(), isa)); 1557 real_patch_delta = image_header->GetPatchDelta(); 1558 } 1559 const OatHeader& oat_header = oat_file->GetOatHeader(); 1560 return real_patch_delta - oat_header.GetImagePatchDelta(); 1561} 1562 1563bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1564 bool* checksum_verified, 1565 std::string* error_msg) { 1566 Runtime* runtime = Runtime::Current(); 1567 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1568 if (image_space == nullptr) { 1569 *error_msg = "No image space present"; 1570 return false; 1571 } 1572 uint32_t real_image_checksum; 1573 void* real_image_oat_offset; 1574 int32_t real_patch_delta; 1575 if (isa == runtime->GetInstructionSet()) { 1576 const ImageHeader& image_header = image_space->GetImageHeader(); 1577 real_image_checksum = image_header.GetOatChecksum(); 1578 real_image_oat_offset = image_header.GetOatDataBegin(); 1579 real_patch_delta = image_header.GetPatchDelta(); 1580 } else { 1581 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1582 image_space->GetImageLocation().c_str(), isa)); 1583 real_image_checksum = image_header->GetOatChecksum(); 1584 real_image_oat_offset = image_header->GetOatDataBegin(); 1585 real_patch_delta = image_header->GetPatchDelta(); 1586 } 1587 1588 const OatHeader& oat_header = oat_file->GetOatHeader(); 1589 std::string compound_msg; 1590 1591 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1592 *checksum_verified = oat_image_checksum == real_image_checksum; 1593 if (!*checksum_verified) { 1594 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1595 real_image_checksum, oat_image_checksum); 1596 } 1597 1598 void* oat_image_oat_offset = 1599 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1600 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1601 if (!offset_verified) { 1602 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1603 real_image_oat_offset, oat_image_oat_offset); 1604 } 1605 1606 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1607 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1608 if (!patch_delta_verified) { 1609 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1610 real_patch_delta, oat_patch_delta); 1611 } 1612 1613 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1614 if (!ret) { 1615 *error_msg = "Oat file failed to verify:" + compound_msg; 1616 } 1617 return ret; 1618} 1619 1620const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1621 std::string* error_msg) { 1622 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1623 if (oat_file != nullptr) { 1624 return oat_file; 1625 } 1626 1627 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1628 error_msg); 1629 if (oat_file == NULL) { 1630 return NULL; 1631 } 1632 return oat_file; 1633} 1634 1635static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1636 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1637 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1638 1639 DCHECK(obj != NULL); 1640 DCHECK(class_linker != NULL); 1641 1642 if (obj->IsArtMethod()) { 1643 mirror::ArtMethod* method = obj->AsArtMethod(); 1644 if (!method->IsNative()) { 1645 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1646 if (method != Runtime::Current()->GetResolutionMethod()) { 1647 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1648 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1649 } 1650 } 1651 } 1652} 1653 1654void ClassLinker::InitFromImage() { 1655 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1656 CHECK(!init_done_); 1657 1658 Thread* self = Thread::Current(); 1659 gc::Heap* heap = Runtime::Current()->GetHeap(); 1660 gc::space::ImageSpace* space = heap->GetImageSpace(); 1661 dex_cache_image_class_lookup_required_ = true; 1662 CHECK(space != NULL); 1663 OatFile& oat_file = GetImageOatFile(space); 1664 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1665 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1666 const char* image_file_location = oat_file.GetOatHeader(). 1667 GetStoreValueByKey(OatHeader::kImageLocationKey); 1668 CHECK(image_file_location == nullptr || *image_file_location == 0); 1669 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1670 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1671 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1672 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1673 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1674 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1675 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1676 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1677 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1678 1679 StackHandleScope<1> hs(self); 1680 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1681 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1682 AsObjectArray<mirror::Class>())); 1683 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1684 1685 // Special case of setting up the String class early so that we can test arbitrary objects 1686 // as being Strings or not 1687 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1688 1689 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1690 static_cast<uint32_t>(dex_caches->GetLength())); 1691 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1692 StackHandleScope<1> hs(self); 1693 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1694 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1695 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1696 nullptr); 1697 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1698 std::string error_msg; 1699 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1700 if (dex_file == NULL) { 1701 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1702 << " from within oat file " << oat_file.GetLocation() 1703 << " error '" << error_msg << "'"; 1704 } 1705 1706 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1707 1708 AppendToBootClassPath(*dex_file, dex_cache); 1709 } 1710 1711 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1712 // bitmap walk. 1713 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1714 1715 // Set entry point to interpreter if in InterpretOnly mode. 1716 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1717 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1718 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1719 } 1720 1721 // reinit class_roots_ 1722 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1723 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1724 1725 // reinit array_iftable_ from any array class instance, they should be == 1726 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1727 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1728 // String class root was set above 1729 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1730 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1731 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1732 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1733 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1734 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1735 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1736 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1737 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1738 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1739 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1740 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1741 1742 FinishInit(self); 1743 1744 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1745} 1746 1747void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1748 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1749 if ((flags & kVisitRootFlagAllRoots) != 0) { 1750 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1751 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1752 } 1753 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1754 for (auto& pair : new_class_roots_) { 1755 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1756 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1757 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1758 if (UNLIKELY(new_ref != old_ref)) { 1759 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1760 // corresponding object. This is slow, but luckily for us, this may only happen with a 1761 // concurrent moving GC. 1762 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1763 it != end && it->first == pair.first; ++it) { 1764 // If the class stored matches the old class, update it to the new value. 1765 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1766 it->second = GcRoot<mirror::Class>(new_ref); 1767 } 1768 } 1769 } 1770 } 1771 } 1772 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1773 new_class_roots_.clear(); 1774 } 1775 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1776 log_new_class_table_roots_ = true; 1777 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1778 log_new_class_table_roots_ = false; 1779 } 1780 // We deliberately ignore the class roots in the image since we 1781 // handle image roots by using the MS/CMS rescanning of dirty cards. 1782} 1783 1784// Keep in sync with InitCallback. Anything we visit, we need to 1785// reinit references to when reinitializing a ClassLinker from a 1786// mapped image. 1787void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1788 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1789 Thread* self = Thread::Current(); 1790 { 1791 ReaderMutexLock mu(self, dex_lock_); 1792 if ((flags & kVisitRootFlagAllRoots) != 0) { 1793 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1794 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1795 } 1796 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1797 for (size_t index : new_dex_cache_roots_) { 1798 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1799 } 1800 } 1801 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1802 new_dex_cache_roots_.clear(); 1803 } 1804 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1805 log_new_dex_caches_roots_ = true; 1806 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1807 log_new_dex_caches_roots_ = false; 1808 } 1809 } 1810 VisitClassRoots(callback, arg, flags); 1811 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1812 DCHECK(!array_iftable_.IsNull()); 1813 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1814 if (!find_array_class_cache_[i].IsNull()) { 1815 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1816 } 1817 } 1818} 1819 1820void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1821 if (dex_cache_image_class_lookup_required_) { 1822 MoveImageClassesToClassTable(); 1823 } 1824 // TODO: why isn't this a ReaderMutexLock? 1825 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1826 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1827 mirror::Class* c = it.second.Read(); 1828 if (!visitor(c, arg)) { 1829 return; 1830 } 1831 } 1832} 1833 1834static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1835 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1836 classes->insert(c); 1837 return true; 1838} 1839 1840struct GetClassesVisitorArrayArg { 1841 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1842 int32_t index; 1843 bool success; 1844}; 1845 1846static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1847 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1848 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1849 if (arg->index < (*arg->classes)->GetLength()) { 1850 (*arg->classes)->Set(arg->index, c); 1851 arg->index++; 1852 return true; 1853 } else { 1854 arg->success = false; 1855 return false; 1856 } 1857} 1858 1859void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1860 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1861 // is avoiding duplicates. 1862 if (!kMovingClasses) { 1863 std::set<mirror::Class*> classes; 1864 VisitClasses(GetClassesVisitorSet, &classes); 1865 for (mirror::Class* klass : classes) { 1866 if (!visitor(klass, arg)) { 1867 return; 1868 } 1869 } 1870 } else { 1871 Thread* self = Thread::Current(); 1872 StackHandleScope<1> hs(self); 1873 Handle<mirror::ObjectArray<mirror::Class>> classes = 1874 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1875 GetClassesVisitorArrayArg local_arg; 1876 local_arg.classes = &classes; 1877 local_arg.success = false; 1878 // We size the array assuming classes won't be added to the class table during the visit. 1879 // If this assumption fails we iterate again. 1880 while (!local_arg.success) { 1881 size_t class_table_size; 1882 { 1883 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1884 class_table_size = class_table_.size(); 1885 } 1886 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1887 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1888 classes.Assign( 1889 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1890 CHECK(classes.Get() != nullptr); // OOME. 1891 local_arg.index = 0; 1892 local_arg.success = true; 1893 VisitClasses(GetClassesVisitorArray, &local_arg); 1894 } 1895 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1896 // If the class table shrank during creation of the clases array we expect null elements. If 1897 // the class table grew then the loop repeats. If classes are created after the loop has 1898 // finished then we don't visit. 1899 mirror::Class* klass = classes->Get(i); 1900 if (klass != nullptr && !visitor(klass, arg)) { 1901 return; 1902 } 1903 } 1904 } 1905} 1906 1907ClassLinker::~ClassLinker() { 1908 mirror::Class::ResetClass(); 1909 mirror::String::ResetClass(); 1910 mirror::Reference::ResetClass(); 1911 mirror::ArtField::ResetClass(); 1912 mirror::ArtMethod::ResetClass(); 1913 mirror::BooleanArray::ResetArrayClass(); 1914 mirror::ByteArray::ResetArrayClass(); 1915 mirror::CharArray::ResetArrayClass(); 1916 mirror::DoubleArray::ResetArrayClass(); 1917 mirror::FloatArray::ResetArrayClass(); 1918 mirror::IntArray::ResetArrayClass(); 1919 mirror::LongArray::ResetArrayClass(); 1920 mirror::ShortArray::ResetArrayClass(); 1921 mirror::Throwable::ResetClass(); 1922 mirror::StackTraceElement::ResetClass(); 1923 STLDeleteElements(&boot_class_path_); 1924 STLDeleteElements(&oat_files_); 1925} 1926 1927mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1928 gc::Heap* heap = Runtime::Current()->GetHeap(); 1929 StackHandleScope<16> hs(self); 1930 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1931 Handle<mirror::DexCache> dex_cache( 1932 hs.NewHandle(down_cast<mirror::DexCache*>( 1933 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1934 VoidFunctor())))); 1935 if (dex_cache.Get() == NULL) { 1936 return NULL; 1937 } 1938 Handle<mirror::String> 1939 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1940 if (location.Get() == NULL) { 1941 return NULL; 1942 } 1943 Handle<mirror::ObjectArray<mirror::String>> 1944 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1945 if (strings.Get() == NULL) { 1946 return NULL; 1947 } 1948 Handle<mirror::ObjectArray<mirror::Class>> 1949 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1950 if (types.Get() == NULL) { 1951 return NULL; 1952 } 1953 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1954 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1955 if (methods.Get() == NULL) { 1956 return NULL; 1957 } 1958 Handle<mirror::ObjectArray<mirror::ArtField>> 1959 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1960 if (fields.Get() == NULL) { 1961 return NULL; 1962 } 1963 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1964 fields.Get()); 1965 return dex_cache.Get(); 1966} 1967 1968mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1969 uint32_t class_size) { 1970 DCHECK_GE(class_size, sizeof(mirror::Class)); 1971 gc::Heap* heap = Runtime::Current()->GetHeap(); 1972 mirror::Class::InitializeClassVisitor visitor(class_size); 1973 mirror::Object* k = kMovingClasses ? 1974 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1975 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1976 if (UNLIKELY(k == nullptr)) { 1977 CHECK(self->IsExceptionPending()); // OOME. 1978 return nullptr; 1979 } 1980 return k->AsClass(); 1981} 1982 1983mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1984 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1985} 1986 1987mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1988 return down_cast<mirror::ArtField*>( 1989 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1990} 1991 1992mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1993 return down_cast<mirror::ArtMethod*>( 1994 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1995} 1996 1997mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1998 Thread* self, size_t length) { 1999 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 2000 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 2001} 2002 2003mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2004 mirror::Class* klass) { 2005 DCHECK(klass != NULL); 2006 2007 // For temporary classes we must wait for them to be retired. 2008 if (init_done_ && klass->IsTemp()) { 2009 CHECK(!klass->IsResolved()); 2010 if (klass->IsErroneous()) { 2011 ThrowEarlierClassFailure(klass); 2012 return nullptr; 2013 } 2014 StackHandleScope<1> hs(self); 2015 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2016 ObjectLock<mirror::Class> lock(self, h_class); 2017 // Loop and wait for the resolving thread to retire this class. 2018 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2019 lock.WaitIgnoringInterrupts(); 2020 } 2021 if (h_class->IsErroneous()) { 2022 ThrowEarlierClassFailure(h_class.Get()); 2023 return nullptr; 2024 } 2025 CHECK(h_class->IsRetired()); 2026 // Get the updated class from class table. 2027 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 2028 } 2029 2030 // Wait for the class if it has not already been linked. 2031 if (!klass->IsResolved() && !klass->IsErroneous()) { 2032 StackHandleScope<1> hs(self); 2033 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2034 ObjectLock<mirror::Class> lock(self, h_class); 2035 // Check for circular dependencies between classes. 2036 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2037 ThrowClassCircularityError(h_class.Get()); 2038 h_class->SetStatus(mirror::Class::kStatusError, self); 2039 return nullptr; 2040 } 2041 // Wait for the pending initialization to complete. 2042 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2043 lock.WaitIgnoringInterrupts(); 2044 } 2045 } 2046 2047 if (klass->IsErroneous()) { 2048 ThrowEarlierClassFailure(klass); 2049 return nullptr; 2050 } 2051 // Return the loaded class. No exceptions should be pending. 2052 CHECK(klass->IsResolved()) << PrettyClass(klass); 2053 self->AssertNoPendingException(); 2054 return klass; 2055} 2056 2057typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2058 2059// Search a collection of DexFiles for a descriptor 2060ClassPathEntry FindInClassPath(const char* descriptor, 2061 const std::vector<const DexFile*>& class_path) { 2062 for (size_t i = 0; i != class_path.size(); ++i) { 2063 const DexFile* dex_file = class_path[i]; 2064 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2065 if (dex_class_def != NULL) { 2066 return ClassPathEntry(dex_file, dex_class_def); 2067 } 2068 } 2069 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2070 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 2071 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 2072} 2073 2074mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2075 ConstHandle<mirror::ClassLoader> class_loader) { 2076 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2077 DCHECK(self != nullptr); 2078 self->AssertNoPendingException(); 2079 if (descriptor[1] == '\0') { 2080 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2081 // for primitive classes that aren't backed by dex files. 2082 return FindPrimitiveClass(descriptor[0]); 2083 } 2084 // Find the class in the loaded classes table. 2085 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2086 if (klass != nullptr) { 2087 return EnsureResolved(self, descriptor, klass); 2088 } 2089 // Class is not yet loaded. 2090 if (descriptor[0] == '[') { 2091 return CreateArrayClass(self, descriptor, class_loader); 2092 } else if (class_loader.Get() == nullptr) { 2093 // The boot class loader, search the boot class path. 2094 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2095 if (pair.second != nullptr) { 2096 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2097 } else { 2098 // The boot class loader is searched ahead of the application class loader, failures are 2099 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2100 // trigger the chaining with a proper stack trace. 2101 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2102 self->SetException(ThrowLocation(), pre_allocated); 2103 return nullptr; 2104 } 2105 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2106 // First try with the bootstrap class loader. 2107 if (class_loader.Get() != nullptr) { 2108 klass = LookupClass(descriptor, nullptr); 2109 if (klass != nullptr) { 2110 return EnsureResolved(self, descriptor, klass); 2111 } 2112 } 2113 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2114 // a NoClassDefFoundError being allocated. 2115 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2116 if (pair.second != nullptr) { 2117 StackHandleScope<1> hs(self); 2118 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2119 } 2120 // Next try the compile time class path. 2121 const std::vector<const DexFile*>* class_path; 2122 { 2123 ScopedObjectAccessUnchecked soa(self); 2124 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2125 soa.AddLocalReference<jobject>(class_loader.Get())); 2126 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2127 } 2128 pair = FindInClassPath(descriptor, *class_path); 2129 if (pair.second != nullptr) { 2130 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2131 } 2132 } else { 2133 ScopedObjectAccessUnchecked soa(self); 2134 if (class_loader->GetClass() == 2135 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) && 2136 class_loader->GetParent()->GetClass() == 2137 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2138 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2139 // Check if this would be found in the parent boot class loader. 2140 if (pair.second != nullptr) { 2141 mirror::Class* klass = LookupClass(descriptor, nullptr); 2142 if (klass != nullptr) { 2143 return EnsureResolved(self, descriptor, klass); 2144 } 2145 klass = DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2146 *pair.second); 2147 if (klass == nullptr) { 2148 CHECK(self->IsExceptionPending()) << descriptor; 2149 self->ClearException(); 2150 } else { 2151 return klass; 2152 } 2153 } else { 2154 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2155 StackHandleScope<3> hs(self); 2156 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2157 // We need to get the DexPathList and loop through it. 2158 Handle<mirror::ArtField> cookie_field = 2159 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2160 Handle<mirror::ArtField> dex_file_field = 2161 hs.NewHandle( 2162 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2163 mirror::Object* dex_path_list = 2164 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2165 GetObject(class_loader.Get()); 2166 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2167 cookie_field.Get() != nullptr) { 2168 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2169 mirror::Object* dex_elements_obj = 2170 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2171 GetObject(dex_path_list); 2172 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2173 // at the mCookie which is a DexFile vector. 2174 if (dex_elements_obj != nullptr) { 2175 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2176 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2177 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2178 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2179 if (element == nullptr) { 2180 // Should never happen, fall back to java code to throw a NPE. 2181 break; 2182 } 2183 mirror::Object* dex_file = dex_file_field->GetObject(element); 2184 if (dex_file != nullptr) { 2185 const uint64_t cookie = cookie_field->GetLong(dex_file); 2186 auto* dex_files = 2187 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2188 if (dex_files == nullptr) { 2189 // This should never happen so log a warning. 2190 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2191 break; 2192 } 2193 for (const DexFile* dex_file : *dex_files) { 2194 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2195 if (dex_class_def != nullptr) { 2196 RegisterDexFile(*dex_file); 2197 mirror::Class* klass = 2198 DefineClass(descriptor, class_loader, *dex_file, *dex_class_def); 2199 if (klass == nullptr) { 2200 CHECK(self->IsExceptionPending()) << descriptor; 2201 self->ClearException(); 2202 // Exit the loop to make the java code generate an exception. 2203 i = dex_elements->GetLength(); 2204 break; 2205 } 2206 return klass; 2207 } 2208 } 2209 } 2210 } 2211 } 2212 } 2213 } 2214 } 2215 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2216 soa.AddLocalReference<jobject>(class_loader.Get())); 2217 std::string class_name_string(DescriptorToDot(descriptor)); 2218 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2219 { 2220 ScopedThreadStateChange tsc(self, kNative); 2221 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2222 soa.Env()->NewStringUTF(class_name_string.c_str())); 2223 if (class_name_object.get() == nullptr) { 2224 DCHECK(self->IsExceptionPending()); // OOME. 2225 return nullptr; 2226 } 2227 CHECK(class_loader_object.get() != nullptr); 2228 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2229 WellKnownClasses::java_lang_ClassLoader_loadClass, 2230 class_name_object.get())); 2231 } 2232 if (self->IsExceptionPending()) { 2233 // If the ClassLoader threw, pass that exception up. 2234 return nullptr; 2235 } else if (result.get() == nullptr) { 2236 // broken loader - throw NPE to be compatible with Dalvik 2237 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2238 class_name_string.c_str()).c_str()); 2239 return nullptr; 2240 } else { 2241 // success, return mirror::Class* 2242 return soa.Decode<mirror::Class*>(result.get()); 2243 } 2244 } 2245 2246 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2247 return nullptr; 2248} 2249 2250mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2251 ConstHandle<mirror::ClassLoader> class_loader, 2252 const DexFile& dex_file, 2253 const DexFile::ClassDef& dex_class_def) { 2254 Thread* self = Thread::Current(); 2255 StackHandleScope<3> hs(self); 2256 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2257 bool should_allocate = false; 2258 2259 // Load the class from the dex file. 2260 if (UNLIKELY(!init_done_)) { 2261 // finish up init of hand crafted class_roots_ 2262 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2263 klass.Assign(GetClassRoot(kJavaLangObject)); 2264 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2265 klass.Assign(GetClassRoot(kJavaLangClass)); 2266 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2267 klass.Assign(GetClassRoot(kJavaLangString)); 2268 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2269 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2270 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2271 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2272 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2273 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2274 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2275 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2276 } else { 2277 should_allocate = true; 2278 } 2279 } else { 2280 should_allocate = true; 2281 } 2282 2283 if (should_allocate) { 2284 // Allocate a class with the status of not ready. 2285 // Interface object should get the right size here. Regular class will 2286 // figure out the right size later and be replaced with one of the right 2287 // size when the class becomes resolved. 2288 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2289 } 2290 if (UNLIKELY(klass.Get() == nullptr)) { 2291 CHECK(self->IsExceptionPending()); // Expect an OOME. 2292 return nullptr; 2293 } 2294 klass->SetDexCache(FindDexCache(dex_file)); 2295 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2296 ObjectLock<mirror::Class> lock(self, klass); 2297 if (self->IsExceptionPending()) { 2298 // An exception occured during load, set status to erroneous while holding klass' lock in case 2299 // notification is necessary. 2300 if (!klass->IsErroneous()) { 2301 klass->SetStatus(mirror::Class::kStatusError, self); 2302 } 2303 return nullptr; 2304 } 2305 klass->SetClinitThreadId(self->GetTid()); 2306 2307 // Add the newly loaded class to the loaded classes table. 2308 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2309 if (existing != nullptr) { 2310 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2311 // this thread to block. 2312 return EnsureResolved(self, descriptor, existing); 2313 } 2314 2315 // Finish loading (if necessary) by finding parents 2316 CHECK(!klass->IsLoaded()); 2317 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2318 // Loading failed. 2319 if (!klass->IsErroneous()) { 2320 klass->SetStatus(mirror::Class::kStatusError, self); 2321 } 2322 return nullptr; 2323 } 2324 CHECK(klass->IsLoaded()); 2325 // Link the class (if necessary) 2326 CHECK(!klass->IsResolved()); 2327 // TODO: Use fast jobjects? 2328 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2329 2330 mirror::Class* new_class = nullptr; 2331 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2332 // Linking failed. 2333 if (!klass->IsErroneous()) { 2334 klass->SetStatus(mirror::Class::kStatusError, self); 2335 } 2336 return nullptr; 2337 } 2338 self->AssertNoPendingException(); 2339 CHECK(new_class != nullptr) << descriptor; 2340 CHECK(new_class->IsResolved()) << descriptor; 2341 2342 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2343 2344 /* 2345 * We send CLASS_PREPARE events to the debugger from here. The 2346 * definition of "preparation" is creating the static fields for a 2347 * class and initializing them to the standard default values, but not 2348 * executing any code (that comes later, during "initialization"). 2349 * 2350 * We did the static preparation in LinkClass. 2351 * 2352 * The class has been prepared and resolved but possibly not yet verified 2353 * at this point. 2354 */ 2355 Dbg::PostClassPrepare(new_class_h.Get()); 2356 2357 return new_class_h.Get(); 2358} 2359 2360uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2361 const DexFile::ClassDef& dex_class_def) { 2362 const byte* class_data = dex_file.GetClassData(dex_class_def); 2363 size_t num_ref = 0; 2364 size_t num_8 = 0; 2365 size_t num_16 = 0; 2366 size_t num_32 = 0; 2367 size_t num_64 = 0; 2368 if (class_data != NULL) { 2369 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2370 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2371 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2372 char c = descriptor[0]; 2373 switch (c) { 2374 case 'L': 2375 case '[': 2376 num_ref++; 2377 break; 2378 case 'J': 2379 case 'D': 2380 num_64++; 2381 break; 2382 case 'I': 2383 case 'F': 2384 num_32++; 2385 break; 2386 case 'S': 2387 case 'C': 2388 num_16++; 2389 break; 2390 case 'B': 2391 case 'Z': 2392 num_8++; 2393 break; 2394 default: 2395 LOG(FATAL) << "Unknown descriptor: " << c; 2396 } 2397 } 2398 } 2399 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2400} 2401 2402OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2403 bool* found) { 2404 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2405 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2406 if (oat_dex_file == nullptr) { 2407 *found = false; 2408 return OatFile::OatClass::Invalid(); 2409 } 2410 *found = true; 2411 return oat_dex_file->GetOatClass(class_def_idx); 2412} 2413 2414static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2415 uint32_t method_idx) { 2416 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2417 const byte* class_data = dex_file.GetClassData(class_def); 2418 CHECK(class_data != NULL); 2419 ClassDataItemIterator it(dex_file, class_data); 2420 // Skip fields 2421 while (it.HasNextStaticField()) { 2422 it.Next(); 2423 } 2424 while (it.HasNextInstanceField()) { 2425 it.Next(); 2426 } 2427 // Process methods 2428 size_t class_def_method_index = 0; 2429 while (it.HasNextDirectMethod()) { 2430 if (it.GetMemberIndex() == method_idx) { 2431 return class_def_method_index; 2432 } 2433 class_def_method_index++; 2434 it.Next(); 2435 } 2436 while (it.HasNextVirtualMethod()) { 2437 if (it.GetMemberIndex() == method_idx) { 2438 return class_def_method_index; 2439 } 2440 class_def_method_index++; 2441 it.Next(); 2442 } 2443 DCHECK(!it.HasNext()); 2444 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2445 return 0; 2446} 2447 2448const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2449 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2450 // method for direct methods (or virtual methods made direct). 2451 mirror::Class* declaring_class = method->GetDeclaringClass(); 2452 size_t oat_method_index; 2453 if (method->IsStatic() || method->IsDirect()) { 2454 // Simple case where the oat method index was stashed at load time. 2455 oat_method_index = method->GetMethodIndex(); 2456 } else { 2457 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2458 // by search for its position in the declared virtual methods. 2459 oat_method_index = declaring_class->NumDirectMethods(); 2460 size_t end = declaring_class->NumVirtualMethods(); 2461 bool found = false; 2462 for (size_t i = 0; i < end; i++) { 2463 // Check method index instead of identity in case of duplicate method definitions. 2464 if (method->GetDexMethodIndex() == 2465 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2466 found = true; 2467 break; 2468 } 2469 oat_method_index++; 2470 } 2471 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2472 } 2473 DCHECK_EQ(oat_method_index, 2474 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2475 method->GetDeclaringClass()->GetDexClassDefIndex(), 2476 method->GetDexMethodIndex())); 2477 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2478 declaring_class->GetDexClassDefIndex(), 2479 found); 2480 if (!found) { 2481 return OatFile::OatMethod::Invalid(); 2482 } 2483 *found = true; 2484 return oat_class.GetOatMethod(oat_method_index); 2485} 2486 2487// Special case to get oat code without overwriting a trampoline. 2488const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2489 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2490 if (method->IsProxyMethod()) { 2491 return GetQuickProxyInvokeHandler(); 2492 } 2493 bool found; 2494 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2495 const void* result = nullptr; 2496 if (found) { 2497 result = oat_method.GetQuickCode(); 2498 } 2499 2500 if (result == nullptr) { 2501 if (method->IsNative()) { 2502 // No code and native? Use generic trampoline. 2503 result = GetQuickGenericJniTrampoline(); 2504 } else if (method->IsPortableCompiled()) { 2505 // No code? Do we expect portable code? 2506 result = GetQuickToPortableBridge(); 2507 } else { 2508 // No code? You must mean to go into the interpreter. 2509 result = GetQuickToInterpreterBridge(); 2510 } 2511 } 2512 return result; 2513} 2514 2515const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2516 bool* have_portable_code) { 2517 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2518 *have_portable_code = false; 2519 if (method->IsProxyMethod()) { 2520 return GetPortableProxyInvokeHandler(); 2521 } 2522 bool found; 2523 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2524 const void* result = nullptr; 2525 const void* quick_code = nullptr; 2526 if (found) { 2527 result = oat_method.GetPortableCode(); 2528 quick_code = oat_method.GetQuickCode(); 2529 } 2530 2531 if (result == nullptr) { 2532 if (quick_code == nullptr) { 2533 // No code? You must mean to go into the interpreter. 2534 result = GetPortableToInterpreterBridge(); 2535 } else { 2536 // No code? But there's quick code, so use a bridge. 2537 result = GetPortableToQuickBridge(); 2538 } 2539 } else { 2540 *have_portable_code = true; 2541 } 2542 return result; 2543} 2544 2545const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2546 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2547 return nullptr; 2548 } 2549 bool found; 2550 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2551 return found ? oat_method.GetQuickCode() : nullptr; 2552} 2553 2554const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2555 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2556 return nullptr; 2557 } 2558 bool found; 2559 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2560 return found ? oat_method.GetPortableCode() : nullptr; 2561} 2562 2563const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2564 uint32_t method_idx) { 2565 bool found; 2566 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2567 if (!found) { 2568 return nullptr; 2569 } 2570 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2571 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2572} 2573 2574const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2575 uint32_t method_idx) { 2576 bool found; 2577 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2578 if (!found) { 2579 return nullptr; 2580 } 2581 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2582 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2583} 2584 2585// Returns true if the method must run with interpreter, false otherwise. 2586static bool NeedsInterpreter( 2587 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2588 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2589 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2590 // No code: need interpreter. 2591 // May return true for native code, in the case of generic JNI 2592 // DCHECK(!method->IsNative()); 2593 return true; 2594 } 2595#ifdef ART_SEA_IR_MODE 2596 ScopedObjectAccess soa(Thread::Current()); 2597 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2598 LOG(INFO) << "Found " << PrettyMethod(method); 2599 return false; 2600 } 2601#endif 2602 // If interpreter mode is enabled, every method (except native and proxy) must 2603 // be run with interpreter. 2604 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2605 !method->IsNative() && !method->IsProxyMethod(); 2606} 2607 2608void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2609 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2610 if (klass->NumDirectMethods() == 0) { 2611 return; // No direct methods => no static methods. 2612 } 2613 Runtime* runtime = Runtime::Current(); 2614 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2615 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2616 return; // OAT file unavailable. 2617 } 2618 } 2619 2620 const DexFile& dex_file = klass->GetDexFile(); 2621 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2622 CHECK(dex_class_def != nullptr); 2623 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2624 // There should always be class data if there were direct methods. 2625 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2626 ClassDataItemIterator it(dex_file, class_data); 2627 // Skip fields 2628 while (it.HasNextStaticField()) { 2629 it.Next(); 2630 } 2631 while (it.HasNextInstanceField()) { 2632 it.Next(); 2633 } 2634 bool has_oat_class; 2635 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2636 &has_oat_class); 2637 // Link the code of methods skipped by LinkCode. 2638 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2639 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2640 if (!method->IsStatic()) { 2641 // Only update static methods. 2642 continue; 2643 } 2644 const void* portable_code = nullptr; 2645 const void* quick_code = nullptr; 2646 if (has_oat_class) { 2647 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2648 portable_code = oat_method.GetPortableCode(); 2649 quick_code = oat_method.GetQuickCode(); 2650 } 2651 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2652 bool have_portable_code = false; 2653 if (enter_interpreter) { 2654 // Use interpreter entry point. 2655 // Check whether the method is native, in which case it's generic JNI. 2656 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2657 quick_code = GetQuickGenericJniTrampoline(); 2658 portable_code = GetPortableToQuickBridge(); 2659 } else { 2660 portable_code = GetPortableToInterpreterBridge(); 2661 quick_code = GetQuickToInterpreterBridge(); 2662 } 2663 } else { 2664 if (portable_code == nullptr) { 2665 portable_code = GetPortableToQuickBridge(); 2666 } else { 2667 have_portable_code = true; 2668 } 2669 if (quick_code == nullptr) { 2670 quick_code = GetQuickToPortableBridge(); 2671 } 2672 } 2673 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2674 have_portable_code); 2675 } 2676 // Ignore virtual methods on the iterator. 2677} 2678 2679void ClassLinker::LinkCode(ConstHandle<mirror::ArtMethod> method, 2680 const OatFile::OatClass* oat_class, 2681 const DexFile& dex_file, uint32_t dex_method_index, 2682 uint32_t method_index) { 2683 if (Runtime::Current()->IsCompiler()) { 2684 // The following code only applies to a non-compiler runtime. 2685 return; 2686 } 2687 // Method shouldn't have already been linked. 2688 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2689 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2690 if (oat_class != nullptr) { 2691 // Every kind of method should at least get an invoke stub from the oat_method. 2692 // non-abstract methods also get their code pointers. 2693 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2694 oat_method.LinkMethod(method.Get()); 2695 } 2696 2697 // Install entry point from interpreter. 2698 bool enter_interpreter = NeedsInterpreter(method.Get(), 2699 method->GetEntryPointFromQuickCompiledCode(), 2700 method->GetEntryPointFromPortableCompiledCode()); 2701 if (enter_interpreter && !method->IsNative()) { 2702 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2703 } else { 2704 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2705 } 2706 2707 if (method->IsAbstract()) { 2708 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2709 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2710 return; 2711 } 2712 2713 bool have_portable_code = false; 2714 if (method->IsStatic() && !method->IsConstructor()) { 2715 // For static methods excluding the class initializer, install the trampoline. 2716 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2717 // after initializing class (see ClassLinker::InitializeClass method). 2718 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2719 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2720 } else if (enter_interpreter) { 2721 if (!method->IsNative()) { 2722 // Set entry point from compiled code if there's no code or in interpreter only mode. 2723 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2724 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2725 } else { 2726 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2727 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2728 } 2729 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2730 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2731 have_portable_code = true; 2732 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2733 } else { 2734 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2735 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2736 } 2737 2738 if (method->IsNative()) { 2739 // Unregistering restores the dlsym lookup stub. 2740 method->UnregisterNative(Thread::Current()); 2741 2742 if (enter_interpreter) { 2743 // We have a native method here without code. Then it should have either the GenericJni 2744 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2745 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2746 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2747 } 2748 } 2749 2750 // Allow instrumentation its chance to hijack code. 2751 Runtime* runtime = Runtime::Current(); 2752 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2753 method->GetEntryPointFromQuickCompiledCode(), 2754 method->GetEntryPointFromPortableCompiledCode(), 2755 have_portable_code); 2756} 2757 2758 2759 2760void ClassLinker::LoadClass(const DexFile& dex_file, 2761 const DexFile::ClassDef& dex_class_def, 2762 ConstHandle<mirror::Class> klass, 2763 mirror::ClassLoader* class_loader) { 2764 CHECK(klass.Get() != NULL); 2765 CHECK(klass->GetDexCache() != NULL); 2766 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2767 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2768 CHECK(descriptor != NULL); 2769 2770 klass->SetClass(GetClassRoot(kJavaLangClass)); 2771 if (kUseBakerOrBrooksReadBarrier) { 2772 klass->AssertReadBarrierPointer(); 2773 } 2774 uint32_t access_flags = dex_class_def.access_flags_; 2775 // Make sure that none of our runtime-only flags are set. 2776 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2777 klass->SetAccessFlags(access_flags); 2778 klass->SetClassLoader(class_loader); 2779 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2780 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2781 2782 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2783 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2784 2785 const byte* class_data = dex_file.GetClassData(dex_class_def); 2786 if (class_data == NULL) { 2787 return; // no fields or methods - for example a marker interface 2788 } 2789 2790 2791 bool has_oat_class = false; 2792 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2793 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2794 &has_oat_class); 2795 if (has_oat_class) { 2796 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2797 } 2798 } 2799 if (!has_oat_class) { 2800 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2801 } 2802} 2803 2804void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2805 const byte* class_data, 2806 ConstHandle<mirror::Class> klass, 2807 mirror::ClassLoader* class_loader, 2808 const OatFile::OatClass* oat_class) { 2809 // Load fields. 2810 ClassDataItemIterator it(dex_file, class_data); 2811 Thread* self = Thread::Current(); 2812 if (it.NumStaticFields() != 0) { 2813 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2814 if (UNLIKELY(statics == NULL)) { 2815 CHECK(self->IsExceptionPending()); // OOME. 2816 return; 2817 } 2818 klass->SetSFields(statics); 2819 } 2820 if (it.NumInstanceFields() != 0) { 2821 mirror::ObjectArray<mirror::ArtField>* fields = 2822 AllocArtFieldArray(self, it.NumInstanceFields()); 2823 if (UNLIKELY(fields == NULL)) { 2824 CHECK(self->IsExceptionPending()); // OOME. 2825 return; 2826 } 2827 klass->SetIFields(fields); 2828 } 2829 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2830 StackHandleScope<1> hs(self); 2831 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2832 if (UNLIKELY(sfield.Get() == NULL)) { 2833 CHECK(self->IsExceptionPending()); // OOME. 2834 return; 2835 } 2836 klass->SetStaticField(i, sfield.Get()); 2837 LoadField(dex_file, it, klass, sfield); 2838 } 2839 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2840 StackHandleScope<1> hs(self); 2841 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2842 if (UNLIKELY(ifield.Get() == NULL)) { 2843 CHECK(self->IsExceptionPending()); // OOME. 2844 return; 2845 } 2846 klass->SetInstanceField(i, ifield.Get()); 2847 LoadField(dex_file, it, klass, ifield); 2848 } 2849 2850 // Load methods. 2851 if (it.NumDirectMethods() != 0) { 2852 // TODO: append direct methods to class object 2853 mirror::ObjectArray<mirror::ArtMethod>* directs = 2854 AllocArtMethodArray(self, it.NumDirectMethods()); 2855 if (UNLIKELY(directs == NULL)) { 2856 CHECK(self->IsExceptionPending()); // OOME. 2857 return; 2858 } 2859 klass->SetDirectMethods(directs); 2860 } 2861 if (it.NumVirtualMethods() != 0) { 2862 // TODO: append direct methods to class object 2863 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2864 AllocArtMethodArray(self, it.NumVirtualMethods()); 2865 if (UNLIKELY(virtuals == NULL)) { 2866 CHECK(self->IsExceptionPending()); // OOME. 2867 return; 2868 } 2869 klass->SetVirtualMethods(virtuals); 2870 } 2871 size_t class_def_method_index = 0; 2872 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2873 size_t last_class_def_method_index = 0; 2874 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2875 StackHandleScope<1> hs(self); 2876 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2877 if (UNLIKELY(method.Get() == NULL)) { 2878 CHECK(self->IsExceptionPending()); // OOME. 2879 return; 2880 } 2881 klass->SetDirectMethod(i, method.Get()); 2882 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2883 uint32_t it_method_index = it.GetMemberIndex(); 2884 if (last_dex_method_index == it_method_index) { 2885 // duplicate case 2886 method->SetMethodIndex(last_class_def_method_index); 2887 } else { 2888 method->SetMethodIndex(class_def_method_index); 2889 last_dex_method_index = it_method_index; 2890 last_class_def_method_index = class_def_method_index; 2891 } 2892 class_def_method_index++; 2893 } 2894 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2895 StackHandleScope<1> hs(self); 2896 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2897 if (UNLIKELY(method.Get() == NULL)) { 2898 CHECK(self->IsExceptionPending()); // OOME. 2899 return; 2900 } 2901 klass->SetVirtualMethod(i, method.Get()); 2902 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2903 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2904 class_def_method_index++; 2905 } 2906 DCHECK(!it.HasNext()); 2907} 2908 2909void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2910 ConstHandle<mirror::Class> klass, 2911 ConstHandle<mirror::ArtField> dst) { 2912 uint32_t field_idx = it.GetMemberIndex(); 2913 dst->SetDexFieldIndex(field_idx); 2914 dst->SetDeclaringClass(klass.Get()); 2915 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2916} 2917 2918mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2919 const ClassDataItemIterator& it, 2920 ConstHandle<mirror::Class> klass) { 2921 uint32_t dex_method_idx = it.GetMemberIndex(); 2922 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2923 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2924 2925 mirror::ArtMethod* dst = AllocArtMethod(self); 2926 if (UNLIKELY(dst == NULL)) { 2927 CHECK(self->IsExceptionPending()); // OOME. 2928 return NULL; 2929 } 2930 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2931 2932 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2933 dst->SetDexMethodIndex(dex_method_idx); 2934 dst->SetDeclaringClass(klass.Get()); 2935 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2936 2937 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2938 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2939 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2940 2941 uint32_t access_flags = it.GetMemberAccessFlags(); 2942 2943 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2944 // Set finalizable flag on declaring class. 2945 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2946 // Void return type. 2947 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2948 klass->SetFinalizable(); 2949 } else { 2950 std::string temp; 2951 const char* klass_descriptor = klass->GetDescriptor(&temp); 2952 // The Enum class declares a "final" finalize() method to prevent subclasses from 2953 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2954 // subclasses, so we exclude it here. 2955 // We also want to avoid setting the flag on Object, where we know that finalize() is 2956 // empty. 2957 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2958 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2959 klass->SetFinalizable(); 2960 } 2961 } 2962 } 2963 } else if (method_name[0] == '<') { 2964 // Fix broken access flags for initializers. Bug 11157540. 2965 bool is_init = (strcmp("<init>", method_name) == 0); 2966 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2967 if (UNLIKELY(!is_init && !is_clinit)) { 2968 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2969 } else { 2970 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2971 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2972 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2973 access_flags |= kAccConstructor; 2974 } 2975 } 2976 } 2977 dst->SetAccessFlags(access_flags); 2978 2979 self->EndAssertNoThreadSuspension(old_cause); 2980 return dst; 2981} 2982 2983void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2984 Thread* self = Thread::Current(); 2985 StackHandleScope<1> hs(self); 2986 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2987 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2988 AppendToBootClassPath(dex_file, dex_cache); 2989} 2990 2991void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2992 ConstHandle<mirror::DexCache> dex_cache) { 2993 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2994 boot_class_path_.push_back(&dex_file); 2995 RegisterDexFile(dex_file, dex_cache); 2996} 2997 2998bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2999 dex_lock_.AssertSharedHeld(Thread::Current()); 3000 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3001 mirror::DexCache* dex_cache = GetDexCache(i); 3002 if (dex_cache->GetDexFile() == &dex_file) { 3003 return true; 3004 } 3005 } 3006 return false; 3007} 3008 3009bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3010 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3011 return IsDexFileRegisteredLocked(dex_file); 3012} 3013 3014void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3015 ConstHandle<mirror::DexCache> dex_cache) { 3016 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3017 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 3018 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3019 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3020 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3021 dex_cache->SetDexFile(&dex_file); 3022 if (log_new_dex_caches_roots_) { 3023 // TODO: This is not safe if we can remove dex caches. 3024 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3025 } 3026} 3027 3028void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3029 Thread* self = Thread::Current(); 3030 { 3031 ReaderMutexLock mu(self, dex_lock_); 3032 if (IsDexFileRegisteredLocked(dex_file)) { 3033 return; 3034 } 3035 } 3036 // Don't alloc while holding the lock, since allocation may need to 3037 // suspend all threads and another thread may need the dex_lock_ to 3038 // get to a suspend point. 3039 StackHandleScope<1> hs(self); 3040 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3041 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 3042 { 3043 WriterMutexLock mu(self, dex_lock_); 3044 if (IsDexFileRegisteredLocked(dex_file)) { 3045 return; 3046 } 3047 RegisterDexFileLocked(dex_file, dex_cache); 3048 } 3049} 3050 3051void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3052 ConstHandle<mirror::DexCache> dex_cache) { 3053 WriterMutexLock mu(Thread::Current(), dex_lock_); 3054 RegisterDexFileLocked(dex_file, dex_cache); 3055} 3056 3057mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3058 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3059 // Search assuming unique-ness of dex file. 3060 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3061 mirror::DexCache* dex_cache = GetDexCache(i); 3062 if (dex_cache->GetDexFile() == &dex_file) { 3063 return dex_cache; 3064 } 3065 } 3066 // Search matching by location name. 3067 std::string location(dex_file.GetLocation()); 3068 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3069 mirror::DexCache* dex_cache = GetDexCache(i); 3070 if (dex_cache->GetDexFile()->GetLocation() == location) { 3071 return dex_cache; 3072 } 3073 } 3074 // Failure, dump diagnostic and abort. 3075 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3076 mirror::DexCache* dex_cache = GetDexCache(i); 3077 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3078 } 3079 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3080 return NULL; 3081} 3082 3083void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3084 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3085 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3086 mirror::DexCache* dex_cache = GetDexCache(i); 3087 dex_cache->Fixup(resolution_method); 3088 } 3089} 3090 3091mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3092 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3093 if (UNLIKELY(klass == NULL)) { 3094 return NULL; 3095 } 3096 return InitializePrimitiveClass(klass, type); 3097} 3098 3099mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3100 Primitive::Type type) { 3101 CHECK(primitive_class != NULL); 3102 // Must hold lock on object when initializing. 3103 Thread* self = Thread::Current(); 3104 StackHandleScope<1> hs(self); 3105 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3106 ObjectLock<mirror::Class> lock(self, h_class); 3107 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3108 primitive_class->SetPrimitiveType(type); 3109 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3110 const char* descriptor = Primitive::Descriptor(type); 3111 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3112 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 3113 return primitive_class; 3114} 3115 3116// Create an array class (i.e. the class object for the array, not the 3117// array itself). "descriptor" looks like "[C" or "[[[[B" or 3118// "[Ljava/lang/String;". 3119// 3120// If "descriptor" refers to an array of primitives, look up the 3121// primitive type's internally-generated class object. 3122// 3123// "class_loader" is the class loader of the class that's referring to 3124// us. It's used to ensure that we're looking for the element type in 3125// the right context. It does NOT become the class loader for the 3126// array class; that always comes from the base element class. 3127// 3128// Returns NULL with an exception raised on failure. 3129mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3130 ConstHandle<mirror::ClassLoader> class_loader) { 3131 // Identify the underlying component type 3132 CHECK_EQ('[', descriptor[0]); 3133 StackHandleScope<2> hs(self); 3134 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3135 if (component_type.Get() == nullptr) { 3136 DCHECK(self->IsExceptionPending()); 3137 // We need to accept erroneous classes as component types. 3138 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 3139 if (component_type.Get() == nullptr) { 3140 DCHECK(self->IsExceptionPending()); 3141 return nullptr; 3142 } else { 3143 self->ClearException(); 3144 } 3145 } 3146 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3147 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3148 return nullptr; 3149 } 3150 // See if the component type is already loaded. Array classes are 3151 // always associated with the class loader of their underlying 3152 // element type -- an array of Strings goes with the loader for 3153 // java/lang/String -- so we need to look for it there. (The 3154 // caller should have checked for the existence of the class 3155 // before calling here, but they did so with *their* class loader, 3156 // not the component type's loader.) 3157 // 3158 // If we find it, the caller adds "loader" to the class' initiating 3159 // loader list, which should prevent us from going through this again. 3160 // 3161 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3162 // are the same, because our caller (FindClass) just did the 3163 // lookup. (Even if we get this wrong we still have correct behavior, 3164 // because we effectively do this lookup again when we add the new 3165 // class to the hash table --- necessary because of possible races with 3166 // other threads.) 3167 if (class_loader.Get() != component_type->GetClassLoader()) { 3168 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 3169 if (new_class != NULL) { 3170 return new_class; 3171 } 3172 } 3173 3174 // Fill out the fields in the Class. 3175 // 3176 // It is possible to execute some methods against arrays, because 3177 // all arrays are subclasses of java_lang_Object_, so we need to set 3178 // up a vtable. We can just point at the one in java_lang_Object_. 3179 // 3180 // Array classes are simple enough that we don't need to do a full 3181 // link step. 3182 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3183 if (UNLIKELY(!init_done_)) { 3184 // Classes that were hand created, ie not by FindSystemClass 3185 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3186 new_class.Assign(GetClassRoot(kClassArrayClass)); 3187 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3188 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3189 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3190 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3191 } else if (strcmp(descriptor, 3192 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3193 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3194 } else if (strcmp(descriptor, 3195 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3196 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3197 } else if (strcmp(descriptor, "[C") == 0) { 3198 new_class.Assign(GetClassRoot(kCharArrayClass)); 3199 } else if (strcmp(descriptor, "[I") == 0) { 3200 new_class.Assign(GetClassRoot(kIntArrayClass)); 3201 } 3202 } 3203 if (new_class.Get() == nullptr) { 3204 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3205 if (new_class.Get() == nullptr) { 3206 return nullptr; 3207 } 3208 new_class->SetComponentType(component_type.Get()); 3209 } 3210 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3211 DCHECK(new_class->GetComponentType() != NULL); 3212 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3213 new_class->SetSuperClass(java_lang_Object); 3214 new_class->SetVTable(java_lang_Object->GetVTable()); 3215 new_class->SetPrimitiveType(Primitive::kPrimNot); 3216 new_class->SetClassLoader(component_type->GetClassLoader()); 3217 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3218 new_class->PopulateEmbeddedImtAndVTable(); 3219 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3220 // don't need to set new_class->SetObjectSize(..) 3221 // because Object::SizeOf delegates to Array::SizeOf 3222 3223 3224 // All arrays have java/lang/Cloneable and java/io/Serializable as 3225 // interfaces. We need to set that up here, so that stuff like 3226 // "instanceof" works right. 3227 // 3228 // Note: The GC could run during the call to FindSystemClass, 3229 // so we need to make sure the class object is GC-valid while we're in 3230 // there. Do this by clearing the interface list so the GC will just 3231 // think that the entries are null. 3232 3233 3234 // Use the single, global copies of "interfaces" and "iftable" 3235 // (remember not to free them for arrays). 3236 { 3237 mirror::IfTable* array_iftable = array_iftable_.Read(); 3238 CHECK(array_iftable != nullptr); 3239 new_class->SetIfTable(array_iftable); 3240 } 3241 3242 // Inherit access flags from the component type. 3243 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3244 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3245 access_flags &= kAccJavaFlagsMask; 3246 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3247 // and remove "interface". 3248 access_flags |= kAccAbstract | kAccFinal; 3249 access_flags &= ~kAccInterface; 3250 3251 new_class->SetAccessFlags(access_flags); 3252 3253 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3254 if (existing == nullptr) { 3255 return new_class.Get(); 3256 } 3257 // Another thread must have loaded the class after we 3258 // started but before we finished. Abandon what we've 3259 // done. 3260 // 3261 // (Yes, this happens.) 3262 3263 return existing; 3264} 3265 3266mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3267 switch (type) { 3268 case 'B': 3269 return GetClassRoot(kPrimitiveByte); 3270 case 'C': 3271 return GetClassRoot(kPrimitiveChar); 3272 case 'D': 3273 return GetClassRoot(kPrimitiveDouble); 3274 case 'F': 3275 return GetClassRoot(kPrimitiveFloat); 3276 case 'I': 3277 return GetClassRoot(kPrimitiveInt); 3278 case 'J': 3279 return GetClassRoot(kPrimitiveLong); 3280 case 'S': 3281 return GetClassRoot(kPrimitiveShort); 3282 case 'Z': 3283 return GetClassRoot(kPrimitiveBoolean); 3284 case 'V': 3285 return GetClassRoot(kPrimitiveVoid); 3286 default: 3287 break; 3288 } 3289 std::string printable_type(PrintableChar(type)); 3290 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3291 return NULL; 3292} 3293 3294mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3295 size_t hash) { 3296 if (VLOG_IS_ON(class_linker)) { 3297 mirror::DexCache* dex_cache = klass->GetDexCache(); 3298 std::string source; 3299 if (dex_cache != NULL) { 3300 source += " from "; 3301 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3302 } 3303 LOG(INFO) << "Loaded class " << descriptor << source; 3304 } 3305 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3306 mirror::Class* existing = 3307 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3308 if (existing != NULL) { 3309 return existing; 3310 } 3311 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3312 dex_cache_image_class_lookup_required_) { 3313 // Check a class loaded with the system class loader matches one in the image if the class 3314 // is in the image. 3315 existing = LookupClassFromImage(descriptor); 3316 if (existing != NULL) { 3317 CHECK(klass == existing); 3318 } 3319 } 3320 VerifyObject(klass); 3321 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3322 if (log_new_class_table_roots_) { 3323 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3324 } 3325 return NULL; 3326} 3327 3328mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3329 size_t hash) { 3330 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3331 mirror::Class* existing = 3332 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3333 3334 if (existing == nullptr) { 3335 CHECK(klass->IsProxyClass()); 3336 return nullptr; 3337 } 3338 3339 CHECK_NE(existing, klass) << descriptor; 3340 CHECK(!existing->IsResolved()) << descriptor; 3341 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3342 3343 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3344 ++it) { 3345 mirror::Class* klass = it->second.Read(); 3346 if (klass == existing) { 3347 class_table_.erase(it); 3348 break; 3349 } 3350 } 3351 3352 CHECK(!klass->IsTemp()) << descriptor; 3353 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3354 dex_cache_image_class_lookup_required_) { 3355 // Check a class loaded with the system class loader matches one in the image if the class 3356 // is in the image. 3357 existing = LookupClassFromImage(descriptor); 3358 if (existing != nullptr) { 3359 CHECK(klass == existing) << descriptor; 3360 } 3361 } 3362 VerifyObject(klass); 3363 3364 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3365 if (log_new_class_table_roots_) { 3366 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3367 } 3368 3369 return existing; 3370} 3371 3372bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3373 size_t hash = Hash(descriptor); 3374 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3375 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3376 it != end && it->first == hash; 3377 ++it) { 3378 mirror::Class* klass = it->second.Read(); 3379 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3380 class_table_.erase(it); 3381 return true; 3382 } 3383 } 3384 return false; 3385} 3386 3387mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3388 const mirror::ClassLoader* class_loader) { 3389 size_t hash = Hash(descriptor); 3390 { 3391 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3392 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3393 if (result != NULL) { 3394 return result; 3395 } 3396 } 3397 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3398 return NULL; 3399 } else { 3400 // Lookup failed but need to search dex_caches_. 3401 mirror::Class* result = LookupClassFromImage(descriptor); 3402 if (result != NULL) { 3403 InsertClass(descriptor, result, hash); 3404 } else { 3405 // Searching the image dex files/caches failed, we don't want to get into this situation 3406 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3407 // classes into the class table. 3408 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3409 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3410 MoveImageClassesToClassTable(); 3411 } 3412 } 3413 return result; 3414 } 3415} 3416 3417mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3418 const mirror::ClassLoader* class_loader, 3419 size_t hash) { 3420 auto end = class_table_.end(); 3421 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3422 mirror::Class* klass = it->second.Read(); 3423 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3424 if (kIsDebugBuild) { 3425 // Check for duplicates in the table. 3426 for (++it; it != end && it->first == hash; ++it) { 3427 mirror::Class* klass2 = it->second.Read(); 3428 CHECK(!(klass2->GetClassLoader() == class_loader && 3429 klass2->DescriptorEquals(descriptor))) 3430 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3431 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3432 } 3433 } 3434 return klass; 3435 } 3436 } 3437 return NULL; 3438} 3439 3440static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3441 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3442 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3443 CHECK(image != NULL); 3444 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3445 return root->AsObjectArray<mirror::DexCache>(); 3446} 3447 3448void ClassLinker::MoveImageClassesToClassTable() { 3449 Thread* self = Thread::Current(); 3450 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3451 if (!dex_cache_image_class_lookup_required_) { 3452 return; // All dex cache classes are already in the class table. 3453 } 3454 const char* old_no_suspend_cause = 3455 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3456 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3457 std::string temp; 3458 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3459 mirror::DexCache* dex_cache = dex_caches->Get(i); 3460 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3461 for (int32_t j = 0; j < types->GetLength(); j++) { 3462 mirror::Class* klass = types->Get(j); 3463 if (klass != NULL) { 3464 DCHECK(klass->GetClassLoader() == NULL); 3465 const char* descriptor = klass->GetDescriptor(&temp); 3466 size_t hash = Hash(descriptor); 3467 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3468 if (existing != NULL) { 3469 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3470 << PrettyClassAndClassLoader(klass); 3471 } else { 3472 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3473 if (log_new_class_table_roots_) { 3474 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3475 } 3476 } 3477 } 3478 } 3479 } 3480 dex_cache_image_class_lookup_required_ = false; 3481 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3482} 3483 3484mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3485 Thread* self = Thread::Current(); 3486 const char* old_no_suspend_cause = 3487 self->StartAssertNoThreadSuspension("Image class lookup"); 3488 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3489 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3490 mirror::DexCache* dex_cache = dex_caches->Get(i); 3491 const DexFile* dex_file = dex_cache->GetDexFile(); 3492 // Try binary searching the string/type index. 3493 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3494 if (string_id != NULL) { 3495 const DexFile::TypeId* type_id = 3496 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3497 if (type_id != NULL) { 3498 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3499 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3500 if (klass != NULL) { 3501 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3502 return klass; 3503 } 3504 } 3505 } 3506 } 3507 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3508 return NULL; 3509} 3510 3511void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3512 result.clear(); 3513 if (dex_cache_image_class_lookup_required_) { 3514 MoveImageClassesToClassTable(); 3515 } 3516 size_t hash = Hash(descriptor); 3517 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3518 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3519 it != end && it->first == hash; ++it) { 3520 mirror::Class* klass = it->second.Read(); 3521 if (klass->DescriptorEquals(descriptor)) { 3522 result.push_back(klass); 3523 } 3524 } 3525} 3526 3527void ClassLinker::VerifyClass(ConstHandle<mirror::Class> klass) { 3528 // TODO: assert that the monitor on the Class is held 3529 Thread* self = Thread::Current(); 3530 ObjectLock<mirror::Class> lock(self, klass); 3531 3532 // Don't attempt to re-verify if already sufficiently verified. 3533 if (klass->IsVerified() || 3534 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3535 EnsurePreverifiedMethods(klass); 3536 return; 3537 } 3538 3539 // The class might already be erroneous, for example at compile time if we attempted to verify 3540 // this class as a parent to another. 3541 if (klass->IsErroneous()) { 3542 ThrowEarlierClassFailure(klass.Get()); 3543 return; 3544 } 3545 3546 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3547 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3548 } else { 3549 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3550 << PrettyClass(klass.Get()); 3551 CHECK(!Runtime::Current()->IsCompiler()); 3552 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3553 } 3554 3555 // Skip verification if disabled. 3556 if (!Runtime::Current()->IsVerificationEnabled()) { 3557 klass->SetStatus(mirror::Class::kStatusVerified, self); 3558 EnsurePreverifiedMethods(klass); 3559 return; 3560 } 3561 3562 // Verify super class. 3563 StackHandleScope<2> hs(self); 3564 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3565 if (super.Get() != NULL) { 3566 // Acquire lock to prevent races on verifying the super class. 3567 ObjectLock<mirror::Class> lock(self, super); 3568 3569 if (!super->IsVerified() && !super->IsErroneous()) { 3570 VerifyClass(super); 3571 } 3572 if (!super->IsCompileTimeVerified()) { 3573 std::string error_msg( 3574 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3575 PrettyDescriptor(klass.Get()).c_str(), 3576 PrettyDescriptor(super.Get()).c_str())); 3577 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3578 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3579 if (cause.Get() != nullptr) { 3580 self->ClearException(); 3581 } 3582 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3583 if (cause.Get() != nullptr) { 3584 self->GetException(nullptr)->SetCause(cause.Get()); 3585 } 3586 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3587 if (Runtime::Current()->IsCompiler()) { 3588 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3589 } 3590 klass->SetStatus(mirror::Class::kStatusError, self); 3591 return; 3592 } 3593 } 3594 3595 // Try to use verification information from the oat file, otherwise do runtime verification. 3596 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3597 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3598 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3599 if (oat_file_class_status == mirror::Class::kStatusError) { 3600 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3601 << PrettyDescriptor(klass.Get()) << " in " 3602 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3603 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3604 PrettyDescriptor(klass.Get()).c_str()); 3605 klass->SetStatus(mirror::Class::kStatusError, self); 3606 return; 3607 } 3608 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3609 std::string error_msg; 3610 if (!preverified) { 3611 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3612 Runtime::Current()->IsCompiler(), 3613 &error_msg); 3614 } 3615 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3616 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3617 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3618 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3619 << " because: " << error_msg; 3620 } 3621 self->AssertNoPendingException(); 3622 // Make sure all classes referenced by catch blocks are resolved. 3623 ResolveClassExceptionHandlerTypes(dex_file, klass); 3624 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3625 // Even though there were no verifier failures we need to respect whether the super-class 3626 // was verified or requiring runtime reverification. 3627 if (super.Get() == NULL || super->IsVerified()) { 3628 klass->SetStatus(mirror::Class::kStatusVerified, self); 3629 } else { 3630 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3631 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3632 // Pretend a soft failure occured so that we don't consider the class verified below. 3633 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3634 } 3635 } else { 3636 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3637 // Soft failures at compile time should be retried at runtime. Soft 3638 // failures at runtime will be handled by slow paths in the generated 3639 // code. Set status accordingly. 3640 if (Runtime::Current()->IsCompiler()) { 3641 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3642 } else { 3643 klass->SetStatus(mirror::Class::kStatusVerified, self); 3644 } 3645 } 3646 } else { 3647 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3648 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3649 << " because: " << error_msg; 3650 self->AssertNoPendingException(); 3651 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3652 klass->SetStatus(mirror::Class::kStatusError, self); 3653 } 3654 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3655 // Class is verified so we don't need to do any access check on its methods. 3656 // Let the interpreter know it by setting the kAccPreverified flag onto each 3657 // method. 3658 // Note: we're going here during compilation and at runtime. When we set the 3659 // kAccPreverified flag when compiling image classes, the flag is recorded 3660 // in the image and is set when loading the image. 3661 EnsurePreverifiedMethods(klass); 3662 } 3663} 3664 3665void ClassLinker::EnsurePreverifiedMethods(ConstHandle<mirror::Class> klass) { 3666 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3667 klass->SetPreverifiedFlagOnAllMethods(); 3668 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3669 } 3670} 3671 3672bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3673 mirror::Class::Status& oat_file_class_status) { 3674 // If we're compiling, we can only verify the class using the oat file if 3675 // we are not compiling the image or if the class we're verifying is not part of 3676 // the app. In other words, we will only check for preverification of bootclasspath 3677 // classes. 3678 if (Runtime::Current()->IsCompiler()) { 3679 // Are we compiling the bootclasspath? 3680 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3681 return false; 3682 } 3683 // We are compiling an app (not the image). 3684 3685 // Is this an app class? (I.e. not a bootclasspath class) 3686 if (klass->GetClassLoader() != NULL) { 3687 return false; 3688 } 3689 } 3690 3691 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3692 // Make this work with gtests, which do not set up the image properly. 3693 // TODO: we should clean up gtests to set up the image path properly. 3694 if (Runtime::Current()->IsCompiler() || (oat_dex_file == nullptr)) { 3695 return false; 3696 } 3697 3698 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3699 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3700 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3701 if (oat_file_class_status == mirror::Class::kStatusVerified || 3702 oat_file_class_status == mirror::Class::kStatusInitialized) { 3703 return true; 3704 } 3705 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3706 // Compile time verification failed with a soft error. Compile time verification can fail 3707 // because we have incomplete type information. Consider the following: 3708 // class ... { 3709 // Foo x; 3710 // .... () { 3711 // if (...) { 3712 // v1 gets assigned a type of resolved class Foo 3713 // } else { 3714 // v1 gets assigned a type of unresolved class Bar 3715 // } 3716 // iput x = v1 3717 // } } 3718 // when we merge v1 following the if-the-else it results in Conflict 3719 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3720 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3721 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3722 // at compile time). 3723 return false; 3724 } 3725 if (oat_file_class_status == mirror::Class::kStatusError) { 3726 // Compile time verification failed with a hard error. This is caused by invalid instructions 3727 // in the class. These errors are unrecoverable. 3728 return false; 3729 } 3730 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3731 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3732 // not loading the class. 3733 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3734 // isn't a problem and this case shouldn't occur 3735 return false; 3736 } 3737 std::string temp; 3738 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3739 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3740 << klass->GetDescriptor(&temp); 3741 3742 return false; 3743} 3744 3745void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3746 ConstHandle<mirror::Class> klass) { 3747 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3748 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3749 } 3750 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3751 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3752 } 3753} 3754 3755void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3756 mirror::ArtMethod* method) { 3757 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3758 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3759 if (code_item == NULL) { 3760 return; // native or abstract method 3761 } 3762 if (code_item->tries_size_ == 0) { 3763 return; // nothing to process 3764 } 3765 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3766 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3767 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3768 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3769 CatchHandlerIterator iterator(handlers_ptr); 3770 for (; iterator.HasNext(); iterator.Next()) { 3771 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3772 // unresolved exception types will be ignored by exception delivery 3773 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3774 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3775 if (exception_type == NULL) { 3776 DCHECK(Thread::Current()->IsExceptionPending()); 3777 Thread::Current()->ClearException(); 3778 } 3779 } 3780 } 3781 handlers_ptr = iterator.EndDataPointer(); 3782 } 3783} 3784 3785static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3786static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3787 ConstHandle<mirror::ArtMethod> prototype); 3788 3789mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3790 jobjectArray interfaces, jobject loader, 3791 jobjectArray methods, jobjectArray throws) { 3792 Thread* self = soa.Self(); 3793 StackHandleScope<8> hs(self); 3794 Handle<mirror::Class> klass(hs.NewHandle( 3795 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3796 if (klass.Get() == NULL) { 3797 CHECK(self->IsExceptionPending()); // OOME. 3798 return NULL; 3799 } 3800 DCHECK(klass->GetClass() != NULL); 3801 klass->SetObjectSize(sizeof(mirror::Proxy)); 3802 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3803 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3804 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3805 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3806 klass->SetName(soa.Decode<mirror::String*>(name)); 3807 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3808 klass->SetDexCache(proxy_class->GetDexCache()); 3809 klass->SetStatus(mirror::Class::kStatusIdx, self); 3810 3811 // Instance fields are inherited, but we add a couple of static fields... 3812 { 3813 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3814 if (UNLIKELY(sfields == NULL)) { 3815 CHECK(self->IsExceptionPending()); // OOME. 3816 return NULL; 3817 } 3818 klass->SetSFields(sfields); 3819 } 3820 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3821 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3822 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3823 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3824 CHECK(self->IsExceptionPending()); // OOME. 3825 return nullptr; 3826 } 3827 klass->SetStaticField(0, interfaces_sfield.Get()); 3828 interfaces_sfield->SetDexFieldIndex(0); 3829 interfaces_sfield->SetDeclaringClass(klass.Get()); 3830 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3831 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3832 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3833 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3834 CHECK(self->IsExceptionPending()); // OOME. 3835 return nullptr; 3836 } 3837 klass->SetStaticField(1, throws_sfield.Get()); 3838 throws_sfield->SetDexFieldIndex(1); 3839 throws_sfield->SetDeclaringClass(klass.Get()); 3840 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3841 3842 // Proxies have 1 direct method, the constructor 3843 { 3844 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3845 if (UNLIKELY(directs == nullptr)) { 3846 CHECK(self->IsExceptionPending()); // OOME. 3847 return nullptr; 3848 } 3849 klass->SetDirectMethods(directs); 3850 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3851 if (UNLIKELY(constructor == nullptr)) { 3852 CHECK(self->IsExceptionPending()); // OOME. 3853 return nullptr; 3854 } 3855 klass->SetDirectMethod(0, constructor); 3856 } 3857 3858 // Create virtual method using specified prototypes. 3859 size_t num_virtual_methods = 3860 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3861 { 3862 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3863 num_virtual_methods); 3864 if (UNLIKELY(virtuals == NULL)) { 3865 CHECK(self->IsExceptionPending()); // OOME. 3866 return NULL; 3867 } 3868 klass->SetVirtualMethods(virtuals); 3869 } 3870 for (size_t i = 0; i < num_virtual_methods; ++i) { 3871 StackHandleScope<1> hs(self); 3872 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3873 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3874 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3875 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3876 if (UNLIKELY(clone == nullptr)) { 3877 CHECK(self->IsExceptionPending()); // OOME. 3878 return nullptr; 3879 } 3880 klass->SetVirtualMethod(i, clone); 3881 } 3882 3883 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3884 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3885 self->AssertNoPendingException(); 3886 3887 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3888 mirror::Class* new_class = nullptr; 3889 { 3890 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3891 // Link the fields and virtual methods, creating vtable and iftables 3892 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3893 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3894 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3895 klass->SetStatus(mirror::Class::kStatusError, self); 3896 return nullptr; 3897 } 3898 } 3899 3900 CHECK(klass->IsRetired()); 3901 CHECK_NE(klass.Get(), new_class); 3902 klass.Assign(new_class); 3903 3904 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3905 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3906 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3907 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3908 3909 { 3910 // Lock on klass is released. Lock new class object. 3911 ObjectLock<mirror::Class> initialization_lock(self, klass); 3912 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3913 } 3914 3915 // sanity checks 3916 if (kIsDebugBuild) { 3917 CHECK(klass->GetIFields() == nullptr); 3918 CheckProxyConstructor(klass->GetDirectMethod(0)); 3919 for (size_t i = 0; i < num_virtual_methods; ++i) { 3920 StackHandleScope<2> hs(self); 3921 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3922 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3923 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3924 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3925 CheckProxyMethod(virtual_method, prototype); 3926 } 3927 3928 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3929 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3930 decoded_name->ToModifiedUtf8().c_str())); 3931 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3932 3933 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3934 decoded_name->ToModifiedUtf8().c_str())); 3935 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3936 3937 CHECK_EQ(klass.Get()->GetInterfaces(), 3938 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3939 CHECK_EQ(klass.Get()->GetThrows(), 3940 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3941 } 3942 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3943 CHECK(existing == nullptr); 3944 return klass.Get(); 3945} 3946 3947std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3948 DCHECK(proxy_class->IsProxyClass()); 3949 mirror::String* name = proxy_class->GetName(); 3950 DCHECK(name != NULL); 3951 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3952} 3953 3954mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3955 mirror::ArtMethod* proxy_method) { 3956 DCHECK(proxy_class->IsProxyClass()); 3957 DCHECK(proxy_method->IsProxyMethod()); 3958 // Locate the dex cache of the original interface/Object 3959 mirror::DexCache* dex_cache = nullptr; 3960 { 3961 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3962 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3963 mirror::DexCache* a_dex_cache = GetDexCache(i); 3964 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3965 dex_cache = a_dex_cache; 3966 break; 3967 } 3968 } 3969 } 3970 CHECK(dex_cache != nullptr); 3971 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3972 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3973 CHECK(resolved_method != nullptr); 3974 return resolved_method; 3975} 3976 3977 3978mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3979 ConstHandle<mirror::Class> klass, 3980 mirror::Class* proxy_class) { 3981 // Create constructor for Proxy that must initialize h 3982 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3983 proxy_class->GetDirectMethods(); 3984 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3985 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3986 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3987 // constructor method. 3988 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3989 proxy_constructor); 3990 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3991 // code_ too) 3992 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3993 if (constructor == nullptr) { 3994 CHECK(self->IsExceptionPending()); // OOME. 3995 return nullptr; 3996 } 3997 // Make this constructor public and fix the class to be our Proxy version 3998 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3999 constructor->SetDeclaringClass(klass.Get()); 4000 return constructor; 4001} 4002 4003static void CheckProxyConstructor(mirror::ArtMethod* constructor) 4004 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4005 CHECK(constructor->IsConstructor()); 4006 CHECK_STREQ(constructor->GetName(), "<init>"); 4007 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4008 "(Ljava/lang/reflect/InvocationHandler;)V"); 4009 DCHECK(constructor->IsPublic()); 4010} 4011 4012mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4013 ConstHandle<mirror::Class> klass, 4014 ConstHandle<mirror::ArtMethod> prototype) { 4015 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4016 // prototype method 4017 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4018 prototype.Get()); 4019 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4020 // as necessary 4021 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4022 if (UNLIKELY(method == NULL)) { 4023 CHECK(self->IsExceptionPending()); // OOME. 4024 return NULL; 4025 } 4026 4027 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4028 // the intersection of throw exceptions as defined in Proxy 4029 method->SetDeclaringClass(klass.Get()); 4030 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4031 4032 // At runtime the method looks like a reference and argument saving method, clone the code 4033 // related parameters from this method. 4034 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4035 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4036 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4037 4038 return method; 4039} 4040 4041static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 4042 ConstHandle<mirror::ArtMethod> prototype) 4043 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4044 // Basic sanity 4045 CHECK(!prototype->IsFinal()); 4046 CHECK(method->IsFinal()); 4047 CHECK(!method->IsAbstract()); 4048 4049 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4050 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4051 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4052 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4053 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4054 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4055 4056 StackHandleScope<2> hs(Thread::Current()); 4057 MethodHelper mh(hs.NewHandle(method.Get())); 4058 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4059 CHECK_STREQ(method->GetName(), prototype->GetName()); 4060 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4061 // More complex sanity - via dex cache 4062 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4063} 4064 4065static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4066 bool can_init_parents) 4067 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4068 if (can_init_statics && can_init_parents) { 4069 return true; 4070 } 4071 if (!can_init_statics) { 4072 // Check if there's a class initializer. 4073 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4074 if (clinit != NULL) { 4075 return false; 4076 } 4077 // Check if there are encoded static values needing initialization. 4078 if (klass->NumStaticFields() != 0) { 4079 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4080 DCHECK(dex_class_def != NULL); 4081 if (dex_class_def->static_values_off_ != 0) { 4082 return false; 4083 } 4084 } 4085 } 4086 if (!klass->IsInterface() && klass->HasSuperClass()) { 4087 mirror::Class* super_class = klass->GetSuperClass(); 4088 if (!can_init_parents && !super_class->IsInitialized()) { 4089 return false; 4090 } else { 4091 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4092 return false; 4093 } 4094 } 4095 } 4096 return true; 4097} 4098 4099bool ClassLinker::IsInitialized() const { 4100 return init_done_; 4101} 4102 4103bool ClassLinker::InitializeClass(ConstHandle<mirror::Class> klass, bool can_init_statics, 4104 bool can_init_parents) { 4105 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4106 4107 // Are we already initialized and therefore done? 4108 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4109 // an initialized class will never change its state. 4110 if (klass->IsInitialized()) { 4111 return true; 4112 } 4113 4114 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4115 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4116 return false; 4117 } 4118 4119 Thread* self = Thread::Current(); 4120 uint64_t t0; 4121 { 4122 ObjectLock<mirror::Class> lock(self, klass); 4123 4124 // Re-check under the lock in case another thread initialized ahead of us. 4125 if (klass->IsInitialized()) { 4126 return true; 4127 } 4128 4129 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4130 if (klass->IsErroneous()) { 4131 ThrowEarlierClassFailure(klass.Get()); 4132 return false; 4133 } 4134 4135 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4136 4137 if (!klass->IsVerified()) { 4138 VerifyClass(klass); 4139 if (!klass->IsVerified()) { 4140 // We failed to verify, expect either the klass to be erroneous or verification failed at 4141 // compile time. 4142 if (klass->IsErroneous()) { 4143 CHECK(self->IsExceptionPending()); 4144 } else { 4145 CHECK(Runtime::Current()->IsCompiler()); 4146 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4147 } 4148 return false; 4149 } else { 4150 self->AssertNoPendingException(); 4151 } 4152 } 4153 4154 // If the class is kStatusInitializing, either this thread is 4155 // initializing higher up the stack or another thread has beat us 4156 // to initializing and we need to wait. Either way, this 4157 // invocation of InitializeClass will not be responsible for 4158 // running <clinit> and will return. 4159 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4160 // Could have got an exception during verification. 4161 if (self->IsExceptionPending()) { 4162 return false; 4163 } 4164 // We caught somebody else in the act; was it us? 4165 if (klass->GetClinitThreadId() == self->GetTid()) { 4166 // Yes. That's fine. Return so we can continue initializing. 4167 return true; 4168 } 4169 // No. That's fine. Wait for another thread to finish initializing. 4170 return WaitForInitializeClass(klass, self, lock); 4171 } 4172 4173 if (!ValidateSuperClassDescriptors(klass)) { 4174 klass->SetStatus(mirror::Class::kStatusError, self); 4175 return false; 4176 } 4177 4178 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4179 4180 // From here out other threads may observe that we're initializing and so changes of state 4181 // require the a notification. 4182 klass->SetClinitThreadId(self->GetTid()); 4183 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4184 4185 t0 = NanoTime(); 4186 } 4187 4188 // Initialize super classes, must be done while initializing for the JLS. 4189 if (!klass->IsInterface() && klass->HasSuperClass()) { 4190 mirror::Class* super_class = klass->GetSuperClass(); 4191 if (!super_class->IsInitialized()) { 4192 CHECK(!super_class->IsInterface()); 4193 CHECK(can_init_parents); 4194 StackHandleScope<1> hs(self); 4195 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4196 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4197 if (!super_initialized) { 4198 // The super class was verified ahead of entering initializing, we should only be here if 4199 // the super class became erroneous due to initialization. 4200 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4201 << "Super class initialization failed for " 4202 << PrettyDescriptor(handle_scope_super.Get()) 4203 << " that has unexpected status " << handle_scope_super->GetStatus() 4204 << "\nPending exception:\n" 4205 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 4206 ObjectLock<mirror::Class> lock(self, klass); 4207 // Initialization failed because the super-class is erroneous. 4208 klass->SetStatus(mirror::Class::kStatusError, self); 4209 return false; 4210 } 4211 } 4212 } 4213 4214 if (klass->NumStaticFields() > 0) { 4215 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4216 CHECK(dex_class_def != NULL); 4217 const DexFile& dex_file = klass->GetDexFile(); 4218 StackHandleScope<3> hs(self); 4219 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4220 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4221 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4222 this, *dex_class_def); 4223 const byte* class_data = dex_file.GetClassData(*dex_class_def); 4224 ClassDataItemIterator field_it(dex_file, class_data); 4225 if (value_it.HasNext()) { 4226 DCHECK(field_it.HasNextStaticField()); 4227 CHECK(can_init_statics); 4228 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4229 StackHandleScope<1> hs(self); 4230 Handle<mirror::ArtField> field(hs.NewHandle( 4231 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4232 if (Runtime::Current()->IsActiveTransaction()) { 4233 value_it.ReadValueToField<true>(field); 4234 } else { 4235 value_it.ReadValueToField<false>(field); 4236 } 4237 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4238 } 4239 } 4240 } 4241 4242 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4243 if (clinit != NULL) { 4244 CHECK(can_init_statics); 4245 JValue result; 4246 clinit->Invoke(self, NULL, 0, &result, "V"); 4247 } 4248 4249 uint64_t t1 = NanoTime(); 4250 4251 bool success = true; 4252 { 4253 ObjectLock<mirror::Class> lock(self, klass); 4254 4255 if (self->IsExceptionPending()) { 4256 WrapExceptionInInitializer(); 4257 klass->SetStatus(mirror::Class::kStatusError, self); 4258 success = false; 4259 } else { 4260 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4261 RuntimeStats* thread_stats = self->GetStats(); 4262 ++global_stats->class_init_count; 4263 ++thread_stats->class_init_count; 4264 global_stats->class_init_time_ns += (t1 - t0); 4265 thread_stats->class_init_time_ns += (t1 - t0); 4266 // Set the class as initialized except if failed to initialize static fields. 4267 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4268 if (VLOG_IS_ON(class_linker)) { 4269 std::string temp; 4270 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4271 klass->GetLocation(); 4272 } 4273 // Opportunistically set static method trampolines to their destination. 4274 FixupStaticTrampolines(klass.Get()); 4275 } 4276 } 4277 return success; 4278} 4279 4280bool ClassLinker::WaitForInitializeClass(ConstHandle<mirror::Class> klass, Thread* self, 4281 ObjectLock<mirror::Class>& lock) 4282 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4283 while (true) { 4284 self->AssertNoPendingException(); 4285 CHECK(!klass->IsInitialized()); 4286 lock.WaitIgnoringInterrupts(); 4287 4288 // When we wake up, repeat the test for init-in-progress. If 4289 // there's an exception pending (only possible if 4290 // "interruptShouldThrow" was set), bail out. 4291 if (self->IsExceptionPending()) { 4292 WrapExceptionInInitializer(); 4293 klass->SetStatus(mirror::Class::kStatusError, self); 4294 return false; 4295 } 4296 // Spurious wakeup? Go back to waiting. 4297 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4298 continue; 4299 } 4300 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4301 // Compile time initialization failed. 4302 return false; 4303 } 4304 if (klass->IsErroneous()) { 4305 // The caller wants an exception, but it was thrown in a 4306 // different thread. Synthesize one here. 4307 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4308 PrettyDescriptor(klass.Get()).c_str()); 4309 return false; 4310 } 4311 if (klass->IsInitialized()) { 4312 return true; 4313 } 4314 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4315 << klass->GetStatus(); 4316 } 4317 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4318} 4319 4320bool ClassLinker::ValidateSuperClassDescriptors(ConstHandle<mirror::Class> klass) { 4321 if (klass->IsInterface()) { 4322 return true; 4323 } 4324 // Begin with the methods local to the superclass. 4325 StackHandleScope<2> hs(Thread::Current()); 4326 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4327 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4328 if (klass->HasSuperClass() && 4329 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4330 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4331 mh.ChangeMethod(klass->GetVTableEntry(i)); 4332 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4333 if (mh.GetMethod() != super_mh.GetMethod() && 4334 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4335 ThrowLinkageError(klass.Get(), 4336 "Class %s method %s resolves differently in superclass %s", 4337 PrettyDescriptor(klass.Get()).c_str(), 4338 PrettyMethod(mh.GetMethod()).c_str(), 4339 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4340 return false; 4341 } 4342 } 4343 } 4344 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4345 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4346 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4347 for (uint32_t j = 0; j < num_methods; ++j) { 4348 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4349 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4350 if (mh.GetMethod() != super_mh.GetMethod() && 4351 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4352 ThrowLinkageError(klass.Get(), 4353 "Class %s method %s resolves differently in interface %s", 4354 PrettyDescriptor(klass.Get()).c_str(), 4355 PrettyMethod(mh.GetMethod()).c_str(), 4356 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4357 return false; 4358 } 4359 } 4360 } 4361 } 4362 return true; 4363} 4364 4365bool ClassLinker::EnsureInitialized(ConstHandle<mirror::Class> c, bool can_init_fields, 4366 bool can_init_parents) { 4367 DCHECK(c.Get() != nullptr); 4368 if (c->IsInitialized()) { 4369 EnsurePreverifiedMethods(c); 4370 return true; 4371 } 4372 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4373 Thread* self = Thread::Current(); 4374 if (!success) { 4375 if (can_init_fields && can_init_parents) { 4376 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4377 } 4378 } else { 4379 self->AssertNoPendingException(); 4380 } 4381 return success; 4382} 4383 4384void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4385 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4386 if (fields != nullptr) { 4387 for (int index = 0; index < fields->GetLength(); index ++) { 4388 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4389 fields->Get(index)->SetDeclaringClass(new_class); 4390 } 4391 } 4392 } 4393 4394 fields = new_class->GetSFields(); 4395 if (fields != nullptr) { 4396 for (int index = 0; index < fields->GetLength(); index ++) { 4397 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4398 fields->Get(index)->SetDeclaringClass(new_class); 4399 } 4400 } 4401 } 4402 4403 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4404 if (methods != nullptr) { 4405 for (int index = 0; index < methods->GetLength(); index ++) { 4406 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4407 methods->Get(index)->SetDeclaringClass(new_class); 4408 } 4409 } 4410 } 4411 4412 methods = new_class->GetVirtualMethods(); 4413 if (methods != nullptr) { 4414 for (int index = 0; index < methods->GetLength(); index ++) { 4415 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4416 methods->Get(index)->SetDeclaringClass(new_class); 4417 } 4418 } 4419 } 4420} 4421 4422bool ClassLinker::LinkClass(Thread* self, const char* descriptor, ConstHandle<mirror::Class> klass, 4423 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces, 4424 mirror::Class** new_class) { 4425 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4426 4427 if (!LinkSuperClass(klass)) { 4428 return false; 4429 } 4430 if (!LinkMethods(self, klass, interfaces)) { 4431 return false; 4432 } 4433 if (!LinkInstanceFields(klass)) { 4434 return false; 4435 } 4436 size_t class_size; 4437 if (!LinkStaticFields(klass, &class_size)) { 4438 return false; 4439 } 4440 CreateReferenceInstanceOffsets(klass); 4441 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4442 4443 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4444 // We don't need to retire this class as it has no embedded tables or it was created the 4445 // correct size during class linker initialization. 4446 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4447 4448 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4449 klass->PopulateEmbeddedImtAndVTable(); 4450 } 4451 4452 // This will notify waiters on klass that saw the not yet resolved 4453 // class in the class_table_ during EnsureResolved. 4454 klass->SetStatus(mirror::Class::kStatusResolved, self); 4455 *new_class = klass.Get(); 4456 } else { 4457 CHECK(!klass->IsResolved()); 4458 // Retire the temporary class and create the correctly sized resolved class. 4459 *new_class = klass->CopyOf(self, class_size); 4460 if (UNLIKELY(*new_class == NULL)) { 4461 CHECK(self->IsExceptionPending()); // Expect an OOME. 4462 klass->SetStatus(mirror::Class::kStatusError, self); 4463 return false; 4464 } 4465 4466 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4467 StackHandleScope<1> hs(self); 4468 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4469 ObjectLock<mirror::Class> lock(self, new_class_h); 4470 4471 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4472 4473 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4474 CHECK(existing == NULL || existing == klass.Get()); 4475 4476 // This will notify waiters on temp class that saw the not yet resolved class in the 4477 // class_table_ during EnsureResolved. 4478 klass->SetStatus(mirror::Class::kStatusRetired, self); 4479 4480 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4481 // This will notify waiters on new_class that saw the not yet resolved 4482 // class in the class_table_ during EnsureResolved. 4483 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4484 } 4485 return true; 4486} 4487 4488bool ClassLinker::LoadSuperAndInterfaces(ConstHandle<mirror::Class> klass, const DexFile& dex_file) { 4489 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4490 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4491 uint16_t super_class_idx = class_def.superclass_idx_; 4492 if (super_class_idx != DexFile::kDexNoIndex16) { 4493 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4494 if (super_class == NULL) { 4495 DCHECK(Thread::Current()->IsExceptionPending()); 4496 return false; 4497 } 4498 // Verify 4499 if (!klass->CanAccess(super_class)) { 4500 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4501 PrettyDescriptor(super_class).c_str(), 4502 PrettyDescriptor(klass.Get()).c_str()); 4503 return false; 4504 } 4505 CHECK(super_class->IsResolved()); 4506 klass->SetSuperClass(super_class); 4507 } 4508 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4509 if (interfaces != NULL) { 4510 for (size_t i = 0; i < interfaces->Size(); i++) { 4511 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4512 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4513 if (interface == NULL) { 4514 DCHECK(Thread::Current()->IsExceptionPending()); 4515 return false; 4516 } 4517 // Verify 4518 if (!klass->CanAccess(interface)) { 4519 // TODO: the RI seemed to ignore this in my testing. 4520 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4521 PrettyDescriptor(interface).c_str(), 4522 PrettyDescriptor(klass.Get()).c_str()); 4523 return false; 4524 } 4525 } 4526 } 4527 // Mark the class as loaded. 4528 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4529 return true; 4530} 4531 4532bool ClassLinker::LinkSuperClass(ConstHandle<mirror::Class> klass) { 4533 CHECK(!klass->IsPrimitive()); 4534 mirror::Class* super = klass->GetSuperClass(); 4535 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4536 if (super != NULL) { 4537 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4538 return false; 4539 } 4540 return true; 4541 } 4542 if (super == NULL) { 4543 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4544 PrettyDescriptor(klass.Get()).c_str()); 4545 return false; 4546 } 4547 // Verify 4548 if (super->IsFinal() || super->IsInterface()) { 4549 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4550 PrettyDescriptor(super).c_str(), 4551 PrettyDescriptor(klass.Get()).c_str(), 4552 super->IsFinal() ? "declared final" : "an interface"); 4553 return false; 4554 } 4555 if (!klass->CanAccess(super)) { 4556 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4557 PrettyDescriptor(super).c_str(), 4558 PrettyDescriptor(klass.Get()).c_str()); 4559 return false; 4560 } 4561 4562 // Inherit kAccClassIsFinalizable from the superclass in case this 4563 // class doesn't override finalize. 4564 if (super->IsFinalizable()) { 4565 klass->SetFinalizable(); 4566 } 4567 4568 // Inherit reference flags (if any) from the superclass. 4569 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4570 if (reference_flags != 0) { 4571 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4572 } 4573 // Disallow custom direct subclasses of java.lang.ref.Reference. 4574 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4575 ThrowLinkageError(klass.Get(), 4576 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4577 PrettyDescriptor(klass.Get()).c_str()); 4578 return false; 4579 } 4580 4581 if (kIsDebugBuild) { 4582 // Ensure super classes are fully resolved prior to resolving fields.. 4583 while (super != NULL) { 4584 CHECK(super->IsResolved()); 4585 super = super->GetSuperClass(); 4586 } 4587 } 4588 return true; 4589} 4590 4591// Populate the class vtable and itable. Compute return type indices. 4592bool ClassLinker::LinkMethods(Thread* self, ConstHandle<mirror::Class> klass, 4593 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4594 if (klass->IsInterface()) { 4595 // No vtable. 4596 size_t count = klass->NumVirtualMethods(); 4597 if (!IsUint(16, count)) { 4598 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4599 return false; 4600 } 4601 for (size_t i = 0; i < count; ++i) { 4602 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4603 } 4604 // Link interface method tables 4605 return LinkInterfaceMethods(klass, interfaces); 4606 } else { 4607 // Link virtual and interface method tables 4608 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4609 } 4610 return true; 4611} 4612 4613bool ClassLinker::LinkVirtualMethods(Thread* self, ConstHandle<mirror::Class> klass) { 4614 if (klass->HasSuperClass()) { 4615 uint32_t max_count = klass->NumVirtualMethods() + 4616 klass->GetSuperClass()->GetVTableLength(); 4617 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4618 CHECK_LE(actual_count, max_count); 4619 StackHandleScope<4> hs(self); 4620 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4621 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4622 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4623 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4624 if (UNLIKELY(vtable.Get() == nullptr)) { 4625 CHECK(self->IsExceptionPending()); // OOME. 4626 return false; 4627 } 4628 int len = super_class->GetVTableLength(); 4629 for (int i = 0; i < len; i++) { 4630 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4631 } 4632 } else { 4633 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4634 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4635 if (UNLIKELY(vtable.Get() == nullptr)) { 4636 CHECK(self->IsExceptionPending()); // OOME. 4637 return false; 4638 } 4639 } 4640 4641 // See if any of our virtual methods override the superclass. 4642 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4643 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4644 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4645 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4646 local_mh.ChangeMethod(local_method); 4647 size_t j = 0; 4648 for (; j < actual_count; ++j) { 4649 mirror::ArtMethod* super_method = vtable->Get(j); 4650 super_mh.ChangeMethod(super_method); 4651 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4652 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4653 super_method->GetAccessFlags())) { 4654 if (super_method->IsFinal()) { 4655 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4656 PrettyMethod(local_method).c_str(), 4657 super_method->GetDeclaringClassDescriptor()); 4658 return false; 4659 } 4660 vtable->Set<false>(j, local_method); 4661 local_method->SetMethodIndex(j); 4662 break; 4663 } else { 4664 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4665 << " would have incorrectly overridden the package-private method in " 4666 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4667 } 4668 } 4669 } 4670 if (j == actual_count) { 4671 // Not overriding, append. 4672 vtable->Set<false>(actual_count, local_method); 4673 local_method->SetMethodIndex(actual_count); 4674 actual_count += 1; 4675 } 4676 } 4677 if (!IsUint(16, actual_count)) { 4678 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4679 return false; 4680 } 4681 // Shrink vtable if possible 4682 CHECK_LE(actual_count, max_count); 4683 if (actual_count < max_count) { 4684 vtable.Assign(vtable->CopyOf(self, actual_count)); 4685 if (UNLIKELY(vtable.Get() == NULL)) { 4686 CHECK(self->IsExceptionPending()); // OOME. 4687 return false; 4688 } 4689 } 4690 klass->SetVTable(vtable.Get()); 4691 } else { 4692 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4693 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4694 if (!IsUint(16, num_virtual_methods)) { 4695 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4696 return false; 4697 } 4698 StackHandleScope<1> hs(self); 4699 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4700 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4701 if (UNLIKELY(vtable.Get() == NULL)) { 4702 CHECK(self->IsExceptionPending()); // OOME. 4703 return false; 4704 } 4705 for (size_t i = 0; i < num_virtual_methods; ++i) { 4706 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4707 vtable->Set<false>(i, virtual_method); 4708 virtual_method->SetMethodIndex(i & 0xFFFF); 4709 } 4710 klass->SetVTable(vtable.Get()); 4711 } 4712 return true; 4713} 4714 4715bool ClassLinker::LinkInterfaceMethods(ConstHandle<mirror::Class> klass, 4716 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4717 Thread* const self = Thread::Current(); 4718 Runtime* const runtime = Runtime::Current(); 4719 // Set the imt table to be all conflicts by default. 4720 klass->SetImTable(runtime->GetDefaultImt()); 4721 size_t super_ifcount; 4722 if (klass->HasSuperClass()) { 4723 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4724 } else { 4725 super_ifcount = 0; 4726 } 4727 uint32_t num_interfaces = 4728 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4729 size_t ifcount = super_ifcount + num_interfaces; 4730 for (size_t i = 0; i < num_interfaces; i++) { 4731 mirror::Class* interface = 4732 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4733 interfaces->Get(i); 4734 ifcount += interface->GetIfTableCount(); 4735 } 4736 if (ifcount == 0) { 4737 // Class implements no interfaces. 4738 DCHECK_EQ(klass->GetIfTableCount(), 0); 4739 DCHECK(klass->GetIfTable() == NULL); 4740 return true; 4741 } 4742 if (ifcount == super_ifcount) { 4743 // Class implements same interfaces as parent, are any of these not marker interfaces? 4744 bool has_non_marker_interface = false; 4745 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4746 for (size_t i = 0; i < ifcount; ++i) { 4747 if (super_iftable->GetMethodArrayCount(i) > 0) { 4748 has_non_marker_interface = true; 4749 break; 4750 } 4751 } 4752 if (!has_non_marker_interface) { 4753 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4754 klass->SetIfTable(super_iftable); 4755 return true; 4756 } 4757 } 4758 StackHandleScope<5> hs(self); 4759 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4760 if (UNLIKELY(iftable.Get() == NULL)) { 4761 CHECK(self->IsExceptionPending()); // OOME. 4762 return false; 4763 } 4764 if (super_ifcount != 0) { 4765 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4766 for (size_t i = 0; i < super_ifcount; i++) { 4767 mirror::Class* super_interface = super_iftable->GetInterface(i); 4768 iftable->SetInterface(i, super_interface); 4769 } 4770 } 4771 // Flatten the interface inheritance hierarchy. 4772 size_t idx = super_ifcount; 4773 for (size_t i = 0; i < num_interfaces; i++) { 4774 mirror::Class* interface = 4775 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4776 interfaces->Get(i); 4777 DCHECK(interface != NULL); 4778 if (!interface->IsInterface()) { 4779 std::string temp; 4780 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4781 PrettyDescriptor(klass.Get()).c_str(), 4782 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4783 return false; 4784 } 4785 // Check if interface is already in iftable 4786 bool duplicate = false; 4787 for (size_t j = 0; j < idx; j++) { 4788 mirror::Class* existing_interface = iftable->GetInterface(j); 4789 if (existing_interface == interface) { 4790 duplicate = true; 4791 break; 4792 } 4793 } 4794 if (!duplicate) { 4795 // Add this non-duplicate interface. 4796 iftable->SetInterface(idx++, interface); 4797 // Add this interface's non-duplicate super-interfaces. 4798 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4799 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4800 bool super_duplicate = false; 4801 for (size_t k = 0; k < idx; k++) { 4802 mirror::Class* existing_interface = iftable->GetInterface(k); 4803 if (existing_interface == super_interface) { 4804 super_duplicate = true; 4805 break; 4806 } 4807 } 4808 if (!super_duplicate) { 4809 iftable->SetInterface(idx++, super_interface); 4810 } 4811 } 4812 } 4813 } 4814 // Shrink iftable in case duplicates were found 4815 if (idx < ifcount) { 4816 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4817 if (UNLIKELY(iftable.Get() == NULL)) { 4818 CHECK(self->IsExceptionPending()); // OOME. 4819 return false; 4820 } 4821 ifcount = idx; 4822 } else { 4823 CHECK_EQ(idx, ifcount); 4824 } 4825 klass->SetIfTable(iftable.Get()); 4826 4827 // If we're an interface, we don't need the vtable pointers, so we're done. 4828 if (klass->IsInterface()) { 4829 return true; 4830 } 4831 // Allocate imtable 4832 bool imtable_changed = false; 4833 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4834 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4835 if (UNLIKELY(imtable.Get() == NULL)) { 4836 CHECK(self->IsExceptionPending()); // OOME. 4837 return false; 4838 } 4839 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4840 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4841 size_t max_miranda_methods = 0; // The max size of miranda_list. 4842 for (size_t i = 0; i < ifcount; ++i) { 4843 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4844 } 4845 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4846 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4847 size_t miranda_list_size = 0; // The current size of miranda_list. 4848 for (size_t i = 0; i < ifcount; ++i) { 4849 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4850 if (num_methods > 0) { 4851 StackHandleScope<2> hs(self); 4852 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4853 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4854 if (UNLIKELY(method_array.Get() == nullptr)) { 4855 CHECK(self->IsExceptionPending()); // OOME. 4856 return false; 4857 } 4858 iftable->SetMethodArray(i, method_array.Get()); 4859 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4860 hs.NewHandle(klass->GetVTableDuringLinking())); 4861 for (size_t j = 0; j < num_methods; ++j) { 4862 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4863 int32_t k; 4864 // For each method listed in the interface's method list, find the 4865 // matching method in our class's method list. We want to favor the 4866 // subclass over the superclass, which just requires walking 4867 // back from the end of the vtable. (This only matters if the 4868 // superclass defines a private method and this class redefines 4869 // it -- otherwise it would use the same vtable slot. In .dex files 4870 // those don't end up in the virtual method table, so it shouldn't 4871 // matter which direction we go. We walk it backward anyway.) 4872 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4873 vtable_mh.ChangeMethod(vtable->Get(k)); 4874 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4875 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4876 ThrowIllegalAccessError( 4877 klass.Get(), 4878 "Method '%s' implementing interface method '%s' is not public", 4879 PrettyMethod(vtable_mh.Get()).c_str(), 4880 PrettyMethod(interface_mh.Get()).c_str()); 4881 return false; 4882 } 4883 method_array->Set<false>(j, vtable_mh.Get()); 4884 // Place method in imt if entry is empty, place conflict otherwise. 4885 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4886 if (imtable->Get(imt_index) == NULL) { 4887 imtable->Set<false>(imt_index, vtable_mh.Get()); 4888 imtable_changed = true; 4889 } else { 4890 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4891 } 4892 break; 4893 } 4894 } 4895 if (k < 0) { 4896 StackHandleScope<1> hs(self); 4897 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4898 for (size_t l = 0; l < miranda_list_size; ++l) { 4899 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4900 DCHECK(mir_method != nullptr); 4901 vtable_mh.ChangeMethod(mir_method); 4902 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4903 miranda_method.Assign(mir_method); 4904 break; 4905 } 4906 } 4907 if (miranda_method.Get() == NULL) { 4908 // Point the interface table at a phantom slot. 4909 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4910 if (UNLIKELY(miranda_method.Get() == NULL)) { 4911 CHECK(self->IsExceptionPending()); // OOME. 4912 return false; 4913 } 4914 DCHECK_LT(miranda_list_size, max_miranda_methods); 4915 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4916 } 4917 method_array->Set<false>(j, miranda_method.Get()); 4918 } 4919 } 4920 } 4921 } 4922 if (imtable_changed) { 4923 // Fill in empty entries in interface method table with conflict. 4924 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4925 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4926 if (imtable->Get(i) == NULL) { 4927 imtable->Set<false>(i, imt_conflict_method); 4928 } 4929 } 4930 klass->SetImTable(imtable.Get()); 4931 } 4932 if (miranda_list_size > 0) { 4933 int old_method_count = klass->NumVirtualMethods(); 4934 int new_method_count = old_method_count + miranda_list_size; 4935 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4936 if (old_method_count == 0) { 4937 virtuals = AllocArtMethodArray(self, new_method_count); 4938 } else { 4939 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4940 } 4941 if (UNLIKELY(virtuals == NULL)) { 4942 CHECK(self->IsExceptionPending()); // OOME. 4943 return false; 4944 } 4945 klass->SetVirtualMethods(virtuals); 4946 4947 StackHandleScope<1> hs(self); 4948 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4949 hs.NewHandle(klass->GetVTableDuringLinking())); 4950 CHECK(vtable.Get() != NULL); 4951 int old_vtable_count = vtable->GetLength(); 4952 int new_vtable_count = old_vtable_count + miranda_list_size; 4953 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4954 if (UNLIKELY(vtable.Get() == NULL)) { 4955 CHECK(self->IsExceptionPending()); // OOME. 4956 return false; 4957 } 4958 for (size_t i = 0; i < miranda_list_size; ++i) { 4959 mirror::ArtMethod* method = miranda_list->Get(i); 4960 // Leave the declaring class alone as type indices are relative to it 4961 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4962 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4963 klass->SetVirtualMethod(old_method_count + i, method); 4964 vtable->Set<false>(old_vtable_count + i, method); 4965 } 4966 // TODO: do not assign to the vtable field until it is fully constructed. 4967 klass->SetVTable(vtable.Get()); 4968 } 4969 4970 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4971 for (int i = 0; i < vtable->GetLength(); ++i) { 4972 CHECK(vtable->Get(i) != NULL); 4973 } 4974 4975// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4976 4977 return true; 4978} 4979 4980bool ClassLinker::LinkInstanceFields(ConstHandle<mirror::Class> klass) { 4981 CHECK(klass.Get() != NULL); 4982 return LinkFields(klass, false, nullptr); 4983} 4984 4985bool ClassLinker::LinkStaticFields(ConstHandle<mirror::Class> klass, size_t* class_size) { 4986 CHECK(klass.Get() != NULL); 4987 return LinkFields(klass, true, class_size); 4988} 4989 4990struct LinkFieldsComparator { 4991 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4992 } 4993 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4994 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4995 NO_THREAD_SAFETY_ANALYSIS { 4996 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4997 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4998 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4999 if (type1 != type2) { 5000 bool is_primitive1 = type1 != Primitive::kPrimNot; 5001 bool is_primitive2 = type2 != Primitive::kPrimNot; 5002 if (type1 != type2) { 5003 if (is_primitive1 && is_primitive2) { 5004 // Larger primitive types go first. 5005 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5006 } else { 5007 // Reference always goes first. 5008 return !is_primitive1; 5009 } 5010 } 5011 } 5012 // same basic group? then sort by string. 5013 return strcmp(field1->GetName(), field2->GetName()) < 0; 5014 } 5015}; 5016 5017bool ClassLinker::LinkFields(ConstHandle<mirror::Class> klass, bool is_static, size_t* class_size) { 5018 size_t num_fields = 5019 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5020 5021 mirror::ObjectArray<mirror::ArtField>* fields = 5022 is_static ? klass->GetSFields() : klass->GetIFields(); 5023 5024 // Initialize field_offset 5025 MemberOffset field_offset(0); 5026 if (is_static) { 5027 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5028 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5029 // Static fields come after the embedded tables. 5030 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5031 0, 0, 0, 0, 0); 5032 } 5033 field_offset = MemberOffset(base); 5034 } else { 5035 mirror::Class* super_class = klass->GetSuperClass(); 5036 if (super_class != NULL) { 5037 CHECK(super_class->IsResolved()) 5038 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5039 field_offset = MemberOffset(super_class->GetObjectSize()); 5040 } 5041 } 5042 5043 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 5044 5045 // we want a relatively stable order so that adding new fields 5046 // minimizes disruption of C++ version such as Class and Method. 5047 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5048 const char* old_no_suspend_cause = Thread::Current()->StartAssertNoThreadSuspension( 5049 "Naked ArtField references in deque"); 5050 for (size_t i = 0; i < num_fields; i++) { 5051 mirror::ArtField* f = fields->Get(i); 5052 CHECK(f != NULL) << PrettyClass(klass.Get()); 5053 grouped_and_sorted_fields.push_back(f); 5054 } 5055 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5056 LinkFieldsComparator()); 5057 5058 // References should be at the front. 5059 size_t current_field = 0; 5060 size_t num_reference_fields = 0; 5061 FieldGaps gaps; 5062 5063 for (; current_field < num_fields; current_field++) { 5064 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5065 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5066 bool isPrimitive = type != Primitive::kPrimNot; 5067 if (isPrimitive) { 5068 break; // past last reference, move on to the next phase 5069 } 5070 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5071 MemberOffset old_offset = field_offset; 5072 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5073 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5074 } 5075 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5076 grouped_and_sorted_fields.pop_front(); 5077 num_reference_fields++; 5078 fields->Set<false>(current_field, field); 5079 field->SetOffset(field_offset); 5080 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5081 } 5082 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5083 // otherwise we could end up with suboptimal gap fills. 5084 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5085 fields, &grouped_and_sorted_fields, &gaps); 5086 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5087 fields, &grouped_and_sorted_fields, &gaps); 5088 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5089 fields, &grouped_and_sorted_fields, &gaps); 5090 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5091 fields, &grouped_and_sorted_fields, &gaps); 5092 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5093 " fields."; 5094 5095 Thread::Current()->EndAssertNoThreadSuspension(old_no_suspend_cause); 5096 5097 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5098 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5099 // We know there are no non-reference fields in the Reference classes, and we know 5100 // that 'referent' is alphabetically last, so this is easy... 5101 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5102 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5103 --num_reference_fields; 5104 } 5105 5106 if (kIsDebugBuild) { 5107 // Make sure that all reference fields appear before 5108 // non-reference fields, and all double-wide fields are aligned. 5109 bool seen_non_ref = false; 5110 for (size_t i = 0; i < num_fields; i++) { 5111 mirror::ArtField* field = fields->Get(i); 5112 if (false) { // enable to debug field layout 5113 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5114 << " class=" << PrettyClass(klass.Get()) 5115 << " field=" << PrettyField(field) 5116 << " offset=" 5117 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5118 } 5119 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5120 bool is_primitive = type != Primitive::kPrimNot; 5121 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5122 strcmp("referent", field->GetName()) == 0) { 5123 is_primitive = true; // We lied above, so we have to expect a lie here. 5124 } 5125 if (is_primitive) { 5126 if (!seen_non_ref) { 5127 seen_non_ref = true; 5128 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5129 } 5130 } else { 5131 DCHECK(!seen_non_ref) << PrettyField(field); 5132 } 5133 } 5134 if (!seen_non_ref) { 5135 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5136 } 5137 } 5138 5139 size_t size = field_offset.Uint32Value(); 5140 // Update klass 5141 if (is_static) { 5142 klass->SetNumReferenceStaticFields(num_reference_fields); 5143 *class_size = size; 5144 } else { 5145 klass->SetNumReferenceInstanceFields(num_reference_fields); 5146 if (!klass->IsVariableSize()) { 5147 std::string temp; 5148 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5149 size_t previous_size = klass->GetObjectSize(); 5150 if (previous_size != 0) { 5151 // Make sure that we didn't originally have an incorrect size. 5152 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5153 } 5154 klass->SetObjectSize(size); 5155 } 5156 } 5157 return true; 5158} 5159 5160// Set the bitmap of reference offsets, refOffsets, from the ifields 5161// list. 5162void ClassLinker::CreateReferenceInstanceOffsets(ConstHandle<mirror::Class> klass) { 5163 uint32_t reference_offsets = 0; 5164 mirror::Class* super_class = klass->GetSuperClass(); 5165 if (super_class != NULL) { 5166 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5167 // If our superclass overflowed, we don't stand a chance. 5168 if (reference_offsets == CLASS_WALK_SUPER) { 5169 klass->SetReferenceInstanceOffsets(reference_offsets); 5170 return; 5171 } 5172 } 5173 CreateReferenceOffsets(klass, reference_offsets); 5174} 5175 5176void ClassLinker::CreateReferenceOffsets(ConstHandle<mirror::Class> klass, 5177 uint32_t reference_offsets) { 5178 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5179 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5180 // All of the fields that contain object references are guaranteed 5181 // to be at the beginning of the fields list. 5182 for (size_t i = 0; i < num_reference_fields; ++i) { 5183 // Note that byte_offset is the offset from the beginning of 5184 // object, not the offset into instance data 5185 mirror::ArtField* field = fields->Get(i); 5186 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5187 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5188 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5189 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5190 CHECK_NE(new_bit, 0U); 5191 reference_offsets |= new_bit; 5192 } else { 5193 reference_offsets = CLASS_WALK_SUPER; 5194 break; 5195 } 5196 } 5197 klass->SetReferenceInstanceOffsets(reference_offsets); 5198} 5199 5200mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5201 ConstHandle<mirror::DexCache> dex_cache) { 5202 DCHECK(dex_cache.Get() != nullptr); 5203 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5204 if (resolved != NULL) { 5205 return resolved; 5206 } 5207 uint32_t utf16_length; 5208 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5209 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5210 dex_cache->SetResolvedString(string_idx, string); 5211 return string; 5212} 5213 5214mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5215 mirror::Class* referrer) { 5216 StackHandleScope<2> hs(Thread::Current()); 5217 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5218 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5219 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5220} 5221 5222mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5223 ConstHandle<mirror::DexCache> dex_cache, 5224 ConstHandle<mirror::ClassLoader> class_loader) { 5225 DCHECK(dex_cache.Get() != NULL); 5226 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5227 if (resolved == NULL) { 5228 Thread* self = Thread::Current(); 5229 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5230 resolved = FindClass(self, descriptor, class_loader); 5231 if (resolved != NULL) { 5232 // TODO: we used to throw here if resolved's class loader was not the 5233 // boot class loader. This was to permit different classes with the 5234 // same name to be loaded simultaneously by different loaders 5235 dex_cache->SetResolvedType(type_idx, resolved); 5236 } else { 5237 CHECK(self->IsExceptionPending()) 5238 << "Expected pending exception for failed resolution of: " << descriptor; 5239 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5240 StackHandleScope<1> hs(self); 5241 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5242 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5243 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5244 self->ClearException(); 5245 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5246 self->GetException(NULL)->SetCause(cause.Get()); 5247 } 5248 } 5249 } 5250 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5251 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5252 return resolved; 5253} 5254 5255mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5256 ConstHandle<mirror::DexCache> dex_cache, 5257 ConstHandle<mirror::ClassLoader> class_loader, 5258 ConstHandle<mirror::ArtMethod> referrer, 5259 InvokeType type) { 5260 DCHECK(dex_cache.Get() != nullptr); 5261 // Check for hit in the dex cache. 5262 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5263 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5264 return resolved; 5265 } 5266 // Fail, get the declaring class. 5267 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5268 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5269 if (klass == nullptr) { 5270 DCHECK(Thread::Current()->IsExceptionPending()); 5271 return nullptr; 5272 } 5273 // Scan using method_idx, this saves string compares but will only hit for matching dex 5274 // caches/files. 5275 switch (type) { 5276 case kDirect: // Fall-through. 5277 case kStatic: 5278 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5279 break; 5280 case kInterface: 5281 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5282 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5283 break; 5284 case kSuper: // Fall-through. 5285 case kVirtual: 5286 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5287 break; 5288 default: 5289 LOG(FATAL) << "Unreachable - invocation type: " << type; 5290 } 5291 if (resolved == nullptr) { 5292 // Search by name, which works across dex files. 5293 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5294 const Signature signature = dex_file.GetMethodSignature(method_id); 5295 switch (type) { 5296 case kDirect: // Fall-through. 5297 case kStatic: 5298 resolved = klass->FindDirectMethod(name, signature); 5299 break; 5300 case kInterface: 5301 resolved = klass->FindInterfaceMethod(name, signature); 5302 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5303 break; 5304 case kSuper: // Fall-through. 5305 case kVirtual: 5306 resolved = klass->FindVirtualMethod(name, signature); 5307 break; 5308 } 5309 } 5310 // If we found a method, check for incompatible class changes. 5311 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5312 // Be a good citizen and update the dex cache to speed subsequent calls. 5313 dex_cache->SetResolvedMethod(method_idx, resolved); 5314 return resolved; 5315 } else { 5316 // If we had a method, it's an incompatible-class-change error. 5317 if (resolved != nullptr) { 5318 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5319 } else { 5320 // We failed to find the method which means either an access error, an incompatible class 5321 // change, or no such method. First try to find the method among direct and virtual methods. 5322 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5323 const Signature signature = dex_file.GetMethodSignature(method_id); 5324 switch (type) { 5325 case kDirect: 5326 case kStatic: 5327 resolved = klass->FindVirtualMethod(name, signature); 5328 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5329 // have had a resolved method before, which triggers the "true" branch above. 5330 break; 5331 case kInterface: 5332 case kVirtual: 5333 case kSuper: 5334 resolved = klass->FindDirectMethod(name, signature); 5335 break; 5336 } 5337 5338 // If we found something, check that it can be accessed by the referrer. 5339 if (resolved != nullptr && referrer.Get() != nullptr) { 5340 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5341 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5342 if (!referring_class->CanAccess(methods_class)) { 5343 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5344 resolved, type); 5345 return nullptr; 5346 } else if (!referring_class->CanAccessMember(methods_class, 5347 resolved->GetAccessFlags())) { 5348 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5349 return nullptr; 5350 } 5351 } 5352 5353 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5354 // methods and throw if we find the method there. If we find nothing, throw a 5355 // NoSuchMethodError. 5356 switch (type) { 5357 case kDirect: 5358 case kStatic: 5359 if (resolved != nullptr) { 5360 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5361 } else { 5362 resolved = klass->FindInterfaceMethod(name, signature); 5363 if (resolved != nullptr) { 5364 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5365 } else { 5366 ThrowNoSuchMethodError(type, klass, name, signature); 5367 } 5368 } 5369 break; 5370 case kInterface: 5371 if (resolved != nullptr) { 5372 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5373 } else { 5374 resolved = klass->FindVirtualMethod(name, signature); 5375 if (resolved != nullptr) { 5376 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5377 } else { 5378 ThrowNoSuchMethodError(type, klass, name, signature); 5379 } 5380 } 5381 break; 5382 case kSuper: 5383 if (resolved != nullptr) { 5384 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5385 } else { 5386 ThrowNoSuchMethodError(type, klass, name, signature); 5387 } 5388 break; 5389 case kVirtual: 5390 if (resolved != nullptr) { 5391 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5392 } else { 5393 resolved = klass->FindInterfaceMethod(name, signature); 5394 if (resolved != nullptr) { 5395 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5396 } else { 5397 ThrowNoSuchMethodError(type, klass, name, signature); 5398 } 5399 } 5400 break; 5401 } 5402 } 5403 DCHECK(Thread::Current()->IsExceptionPending()); 5404 return nullptr; 5405 } 5406} 5407 5408mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5409 ConstHandle<mirror::DexCache> dex_cache, 5410 ConstHandle<mirror::ClassLoader> class_loader, 5411 bool is_static) { 5412 DCHECK(dex_cache.Get() != nullptr); 5413 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5414 if (resolved != nullptr) { 5415 return resolved; 5416 } 5417 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5418 Thread* const self = Thread::Current(); 5419 StackHandleScope<1> hs(self); 5420 Handle<mirror::Class> klass( 5421 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5422 if (klass.Get() == nullptr) { 5423 DCHECK(Thread::Current()->IsExceptionPending()); 5424 return nullptr; 5425 } 5426 5427 if (is_static) { 5428 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5429 } else { 5430 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5431 } 5432 5433 if (resolved == nullptr) { 5434 const char* name = dex_file.GetFieldName(field_id); 5435 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5436 if (is_static) { 5437 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5438 } else { 5439 resolved = klass->FindInstanceField(name, type); 5440 } 5441 if (resolved == nullptr) { 5442 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5443 return NULL; 5444 } 5445 } 5446 dex_cache->SetResolvedField(field_idx, resolved); 5447 return resolved; 5448} 5449 5450mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5451 uint32_t field_idx, 5452 ConstHandle<mirror::DexCache> dex_cache, 5453 ConstHandle<mirror::ClassLoader> class_loader) { 5454 DCHECK(dex_cache.Get() != nullptr); 5455 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5456 if (resolved != nullptr) { 5457 return resolved; 5458 } 5459 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5460 Thread* self = Thread::Current(); 5461 StackHandleScope<1> hs(self); 5462 Handle<mirror::Class> klass( 5463 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5464 if (klass.Get() == NULL) { 5465 DCHECK(Thread::Current()->IsExceptionPending()); 5466 return NULL; 5467 } 5468 5469 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5470 StringPiece type(dex_file.StringDataByIdx( 5471 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5472 resolved = mirror::Class::FindField(self, klass, name, type); 5473 if (resolved != NULL) { 5474 dex_cache->SetResolvedField(field_idx, resolved); 5475 } else { 5476 ThrowNoSuchFieldError("", klass.Get(), type, name); 5477 } 5478 return resolved; 5479} 5480 5481const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5482 uint32_t* length) { 5483 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5484 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5485 const DexFile& dex_file = *dex_cache->GetDexFile(); 5486 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5487 return dex_file.GetMethodShorty(method_id, length); 5488} 5489 5490void ClassLinker::DumpAllClasses(int flags) { 5491 if (dex_cache_image_class_lookup_required_) { 5492 MoveImageClassesToClassTable(); 5493 } 5494 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5495 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5496 std::vector<mirror::Class*> all_classes; 5497 { 5498 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5499 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5500 mirror::Class* klass = it.second.Read(); 5501 all_classes.push_back(klass); 5502 } 5503 } 5504 5505 for (size_t i = 0; i < all_classes.size(); ++i) { 5506 all_classes[i]->DumpClass(std::cerr, flags); 5507 } 5508} 5509 5510void ClassLinker::DumpForSigQuit(std::ostream& os) { 5511 if (dex_cache_image_class_lookup_required_) { 5512 MoveImageClassesToClassTable(); 5513 } 5514 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5515 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5516} 5517 5518size_t ClassLinker::NumLoadedClasses() { 5519 if (dex_cache_image_class_lookup_required_) { 5520 MoveImageClassesToClassTable(); 5521 } 5522 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5523 return class_table_.size(); 5524} 5525 5526pid_t ClassLinker::GetClassesLockOwner() { 5527 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5528} 5529 5530pid_t ClassLinker::GetDexLockOwner() { 5531 return dex_lock_.GetExclusiveOwnerTid(); 5532} 5533 5534void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5535 DCHECK(!init_done_); 5536 5537 DCHECK(klass != NULL); 5538 DCHECK(klass->GetClassLoader() == NULL); 5539 5540 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5541 DCHECK(class_roots != NULL); 5542 DCHECK(class_roots->Get(class_root) == NULL); 5543 class_roots->Set<false>(class_root, klass); 5544} 5545 5546} // namespace art 5547