class_linker.cc revision d8565456d29f4ad05f11cf84d2d2dac488508e06
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 <iostream> 21#include <memory> 22#include <queue> 23#include <string> 24#include <unistd.h> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "entrypoints/runtime_asm_entrypoints.h" 38#include "gc_root-inl.h" 39#include "gc/accounting/card_table-inl.h" 40#include "gc/accounting/heap_bitmap.h" 41#include "gc/heap.h" 42#include "gc/space/image_space.h" 43#include "handle_scope.h" 44#include "intern_table.h" 45#include "interpreter/interpreter.h" 46#include "jit/jit.h" 47#include "jit/jit_code_cache.h" 48#include "leb128.h" 49#include "oat.h" 50#include "oat_file.h" 51#include "oat_file_assistant.h" 52#include "object_lock.h" 53#include "mirror/art_field-inl.h" 54#include "mirror/art_method-inl.h" 55#include "mirror/class.h" 56#include "mirror/class-inl.h" 57#include "mirror/class_loader.h" 58#include "mirror/dex_cache-inl.h" 59#include "mirror/iftable-inl.h" 60#include "mirror/object-inl.h" 61#include "mirror/object_array-inl.h" 62#include "mirror/proxy.h" 63#include "mirror/reference-inl.h" 64#include "mirror/stack_trace_element.h" 65#include "mirror/string-inl.h" 66#include "os.h" 67#include "runtime.h" 68#include "entrypoints/entrypoint_utils.h" 69#include "ScopedLocalRef.h" 70#include "scoped_thread_state_change.h" 71#include "handle_scope-inl.h" 72#include "thread-inl.h" 73#include "utils.h" 74#include "verifier/method_verifier.h" 75#include "well_known_classes.h" 76 77namespace art { 78 79static void ThrowNoClassDefFoundError(const char* fmt, ...) 80 __attribute__((__format__(__printf__, 1, 2))) 81 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 82static void ThrowNoClassDefFoundError(const char* fmt, ...) { 83 va_list args; 84 va_start(args, fmt); 85 Thread* self = Thread::Current(); 86 self->ThrowNewExceptionV("Ljava/lang/NoClassDefFoundError;", fmt, args); 87 va_end(args); 88} 89 90static void ThrowEarlierClassFailure(mirror::Class* c) 91 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 92 // The class failed to initialize on a previous attempt, so we want to throw 93 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 94 // failed in verification, in which case v2 5.4.1 says we need to re-throw 95 // the previous error. 96 Runtime* const runtime = Runtime::Current(); 97 if (!runtime->IsAotCompiler()) { // Give info if this occurs at runtime. 98 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 99 } 100 101 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 102 Thread* self = Thread::Current(); 103 if (runtime->IsAotCompiler()) { 104 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 105 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 106 self->SetException(pre_allocated); 107 } else { 108 if (c->GetVerifyErrorClass() != NULL) { 109 // TODO: change the verifier to store an _instance_, with a useful detail message? 110 std::string temp; 111 self->ThrowNewException(c->GetVerifyErrorClass()->GetDescriptor(&temp), 112 PrettyDescriptor(c).c_str()); 113 } else { 114 self->ThrowNewException("Ljava/lang/NoClassDefFoundError;", 115 PrettyDescriptor(c).c_str()); 116 } 117 } 118} 119 120static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 121 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 122 if (VLOG_IS_ON(class_linker)) { 123 std::string temp; 124 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 125 << klass->GetLocation() << "\n" << Thread::Current()->GetException()->Dump(); 126 } 127} 128 129static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 130 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 131 Thread* self = Thread::Current(); 132 JNIEnv* env = self->GetJniEnv(); 133 134 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 135 CHECK(cause.get() != nullptr); 136 137 env->ExceptionClear(); 138 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 139 env->Throw(cause.get()); 140 141 // We only wrap non-Error exceptions; an Error can just be used as-is. 142 if (!is_error) { 143 self->ThrowNewWrappedException("Ljava/lang/ExceptionInInitializerError;", nullptr); 144 } 145 VlogClassInitializationFailure(klass); 146} 147 148// Gap between two fields in object layout. 149struct FieldGap { 150 uint32_t start_offset; // The offset from the start of the object. 151 uint32_t size; // The gap size of 1, 2, or 4 bytes. 152}; 153struct FieldGapsComparator { 154 explicit FieldGapsComparator() { 155 } 156 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 157 NO_THREAD_SAFETY_ANALYSIS { 158 // Sort by gap size, largest first. Secondary sort by starting offset. 159 return lhs.size > rhs.size || (lhs.size == rhs.size && lhs.start_offset < rhs.start_offset); 160 } 161}; 162typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 163 164// Adds largest aligned gaps to queue of gaps. 165static void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 166 DCHECK(gaps != nullptr); 167 168 uint32_t current_offset = gap_start; 169 while (current_offset != gap_end) { 170 size_t remaining = gap_end - current_offset; 171 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 172 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 173 current_offset += sizeof(uint32_t); 174 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 175 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 176 current_offset += sizeof(uint16_t); 177 } else { 178 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 179 current_offset += sizeof(uint8_t); 180 } 181 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 182 } 183} 184// Shuffle fields forward, making use of gaps whenever possible. 185template<int n> 186static void ShuffleForward(size_t* current_field_idx, 187 MemberOffset* field_offset, 188 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 189 FieldGaps* gaps) 190 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 191 DCHECK(current_field_idx != nullptr); 192 DCHECK(grouped_and_sorted_fields != nullptr); 193 DCHECK(gaps != nullptr); 194 DCHECK(field_offset != nullptr); 195 196 DCHECK(IsPowerOfTwo(n)); 197 while (!grouped_and_sorted_fields->empty()) { 198 mirror::ArtField* field = grouped_and_sorted_fields->front(); 199 Primitive::Type type = field->GetTypeAsPrimitiveType(); 200 if (Primitive::ComponentSize(type) < n) { 201 break; 202 } 203 if (!IsAligned<n>(field_offset->Uint32Value())) { 204 MemberOffset old_offset = *field_offset; 205 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 206 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 207 } 208 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 209 grouped_and_sorted_fields->pop_front(); 210 if (!gaps->empty() && gaps->top().size >= n) { 211 FieldGap gap = gaps->top(); 212 gaps->pop(); 213 DCHECK(IsAligned<n>(gap.start_offset)); 214 field->SetOffset(MemberOffset(gap.start_offset)); 215 if (gap.size > n) { 216 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 217 } 218 } else { 219 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 220 field->SetOffset(*field_offset); 221 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 222 } 223 ++(*current_field_idx); 224 } 225} 226 227ClassLinker::ClassLinker(InternTable* intern_table) 228 // dex_lock_ is recursive as it may be used in stack dumping. 229 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 230 dex_cache_image_class_lookup_required_(false), 231 failed_dex_cache_class_lookups_(0), 232 class_roots_(nullptr), 233 array_iftable_(nullptr), 234 find_array_class_cache_next_victim_(0), 235 init_done_(false), 236 log_new_dex_caches_roots_(false), 237 log_new_class_table_roots_(false), 238 intern_table_(intern_table), 239 quick_resolution_trampoline_(nullptr), 240 quick_imt_conflict_trampoline_(nullptr), 241 quick_generic_jni_trampoline_(nullptr), 242 quick_to_interpreter_bridge_trampoline_(nullptr), 243 image_pointer_size_(sizeof(void*)) { 244 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 245} 246 247void ClassLinker::InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path) { 248 VLOG(startup) << "ClassLinker::Init"; 249 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 250 251 CHECK(!init_done_); 252 253 // java_lang_Class comes first, it's needed for AllocClass 254 Thread* self = Thread::Current(); 255 gc::Heap* heap = Runtime::Current()->GetHeap(); 256 // The GC can't handle an object with a null class since we can't get the size of this object. 257 heap->IncrementDisableMovingGC(self); 258 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 259 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 260 heap->AllocNonMovableObject<true>(self, nullptr, 261 mirror::Class::ClassClassSize(), 262 VoidFunctor())))); 263 CHECK(java_lang_Class.Get() != nullptr); 264 mirror::Class::SetClassClass(java_lang_Class.Get()); 265 java_lang_Class->SetClass(java_lang_Class.Get()); 266 if (kUseBakerOrBrooksReadBarrier) { 267 java_lang_Class->AssertReadBarrierPointer(); 268 } 269 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 270 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 271 heap->DecrementDisableMovingGC(self); 272 // AllocClass(mirror::Class*) can now be used 273 274 // Class[] is used for reflection support. 275 Handle<mirror::Class> class_array_class(hs.NewHandle( 276 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 277 class_array_class->SetComponentType(java_lang_Class.Get()); 278 279 // java_lang_Object comes next so that object_array_class can be created. 280 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 281 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 282 CHECK(java_lang_Object.Get() != nullptr); 283 // backfill Object as the super class of Class. 284 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 285 mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusLoaded, self); 286 287 // Object[] next to hold class roots. 288 Handle<mirror::Class> object_array_class(hs.NewHandle( 289 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 290 object_array_class->SetComponentType(java_lang_Object.Get()); 291 292 // Setup the char (primitive) class to be used for char[]. 293 Handle<mirror::Class> char_class(hs.NewHandle( 294 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 295 // The primitive char class won't be initialized by 296 // InitializePrimitiveClass until line 459, but strings (and 297 // internal char arrays) will be allocated before that and the 298 // component size, which is computed from the primitive type, needs 299 // to be set here. 300 char_class->SetPrimitiveType(Primitive::kPrimChar); 301 302 // Setup the char[] class to be used for String. 303 Handle<mirror::Class> char_array_class(hs.NewHandle( 304 AllocClass(self, java_lang_Class.Get(), 305 mirror::Array::ClassSize()))); 306 char_array_class->SetComponentType(char_class.Get()); 307 mirror::CharArray::SetArrayClass(char_array_class.Get()); 308 309 // Setup String. 310 Handle<mirror::Class> java_lang_String(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 312 mirror::String::SetClass(java_lang_String.Get()); 313 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 314 mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusResolved, self); 315 316 // Setup Reference. 317 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 318 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 319 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 320 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 321 mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusResolved, self); 322 323 // Create storage for root classes, save away our work so far (requires descriptors). 324 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 325 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 326 kClassRootsMax)); 327 CHECK(!class_roots_.IsNull()); 328 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 329 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 330 SetClassRoot(kClassArrayClass, class_array_class.Get()); 331 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 332 SetClassRoot(kCharArrayClass, char_array_class.Get()); 333 SetClassRoot(kJavaLangString, java_lang_String.Get()); 334 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 335 336 // Setup the primitive type classes. 337 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 338 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 339 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 340 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 341 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 342 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 343 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 344 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 345 346 // Create array interface entries to populate once we can load system classes. 347 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 348 349 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 350 Handle<mirror::Class> int_array_class(hs.NewHandle( 351 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 352 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 353 mirror::IntArray::SetArrayClass(int_array_class.Get()); 354 SetClassRoot(kIntArrayClass, int_array_class.Get()); 355 356 // now that these are registered, we can use AllocClass() and AllocObjectArray 357 358 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 359 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 360 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 361 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 362 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 363 mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusResolved, self); 364 365 // Constructor, Field, Method, and AbstractMethod are necessary so 366 // that FindClass can link members. 367 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 368 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 369 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 370 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 371 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 372 mirror::Class::SetStatus(java_lang_reflect_ArtField, mirror::Class::kStatusResolved, self); 373 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 374 375 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 376 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 377 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 378 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 379 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 380 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 381 mirror::Class::SetStatus(java_lang_reflect_ArtMethod, mirror::Class::kStatusResolved, self); 382 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 383 384 // Set up array classes for string, field, method 385 Handle<mirror::Class> object_array_string(hs.NewHandle( 386 AllocClass(self, java_lang_Class.Get(), 387 mirror::ObjectArray<mirror::String>::ClassSize()))); 388 object_array_string->SetComponentType(java_lang_String.Get()); 389 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 390 391 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 392 AllocClass(self, java_lang_Class.Get(), 393 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 394 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 395 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 396 397 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 398 AllocClass(self, java_lang_Class.Get(), 399 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 400 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 401 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 402 403 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 404 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 405 // these roots. 406 CHECK_NE(0U, boot_class_path.size()); 407 for (auto& dex_file : boot_class_path) { 408 CHECK(dex_file.get() != nullptr); 409 AppendToBootClassPath(self, *dex_file); 410 opened_dex_files_.push_back(std::move(dex_file)); 411 } 412 413 // now we can use FindSystemClass 414 415 // run char class through InitializePrimitiveClass to finish init 416 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 417 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 418 419 // Create runtime resolution and imt conflict methods. Also setup the default imt. 420 Runtime* runtime = Runtime::Current(); 421 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 422 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 423 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 424 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 425 426 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 427 // we do not need friend classes or a publicly exposed setter. 428 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 429 if (!runtime->IsAotCompiler()) { 430 // We need to set up the generic trampolines since we don't have an image. 431 quick_resolution_trampoline_ = GetQuickResolutionStub(); 432 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 433 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 434 } 435 436 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 437 mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusNotReady, self); 438 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 439 CHECK_EQ(java_lang_Object.Get(), Object_class); 440 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 441 mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusNotReady, self); 442 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 443 std::ostringstream os1, os2; 444 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 445 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 446 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 447 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 448 mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusNotReady, self); 449 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 450 CHECK_EQ(java_lang_String.Get(), String_class); 451 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 452 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 453 454 // Setup the primitive array type classes - can't be done until Object has a vtable. 455 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 456 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 457 458 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 459 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 460 461 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 462 CHECK_EQ(char_array_class.Get(), found_char_array_class); 463 464 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 465 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 466 467 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 468 CHECK_EQ(int_array_class.Get(), found_int_array_class); 469 470 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 471 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 472 473 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 474 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 475 476 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 477 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 478 479 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 480 CHECK_EQ(class_array_class.Get(), found_class_array_class); 481 482 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 483 CHECK_EQ(object_array_class.Get(), found_object_array_class); 484 485 // Setup the single, global copy of "iftable". 486 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 487 CHECK(java_lang_Cloneable != nullptr); 488 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 489 CHECK(java_io_Serializable != nullptr); 490 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 491 // crawl up and explicitly list all of the supers as well. 492 { 493 mirror::IfTable* array_iftable = array_iftable_.Read(); 494 array_iftable->SetInterface(0, java_lang_Cloneable); 495 array_iftable->SetInterface(1, java_io_Serializable); 496 } 497 498 // Sanity check Class[] and Object[]'s interfaces. 499 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 500 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 501 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 502 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 503 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 504 // dex_cache_ fields and register them in class_table_. 505 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 506 CHECK_EQ(java_lang_Class.Get(), Class_class); 507 508 mirror::Class::SetStatus(java_lang_reflect_ArtMethod, mirror::Class::kStatusNotReady, self); 509 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 510 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 511 512 mirror::Class::SetStatus(java_lang_reflect_ArtField, mirror::Class::kStatusNotReady, self); 513 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 514 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 515 516 mirror::Class* String_array_class = 517 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 518 CHECK_EQ(object_array_string.Get(), String_array_class); 519 520 mirror::Class* Art_method_array_class = 521 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 522 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 523 524 mirror::Class* Art_field_array_class = 525 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 526 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 527 528 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 529 530 // Create java.lang.reflect.Proxy root. 531 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 532 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 533 534 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 535 // finish initializing Reference class 536 mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusNotReady, self); 537 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 538 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 539 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 540 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 541 mirror::Class* java_lang_ref_FinalizerReference = 542 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 543 java_lang_ref_FinalizerReference->SetAccessFlags( 544 java_lang_ref_FinalizerReference->GetAccessFlags() | 545 kAccClassIsReference | kAccClassIsFinalizerReference); 546 mirror::Class* java_lang_ref_PhantomReference = 547 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 548 java_lang_ref_PhantomReference->SetAccessFlags( 549 java_lang_ref_PhantomReference->GetAccessFlags() | 550 kAccClassIsReference | kAccClassIsPhantomReference); 551 mirror::Class* java_lang_ref_SoftReference = 552 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 553 java_lang_ref_SoftReference->SetAccessFlags( 554 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 555 mirror::Class* java_lang_ref_WeakReference = 556 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 557 java_lang_ref_WeakReference->SetAccessFlags( 558 java_lang_ref_WeakReference->GetAccessFlags() | 559 kAccClassIsReference | kAccClassIsWeakReference); 560 561 // Setup the ClassLoader, verifying the object_size_. 562 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 563 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 564 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 565 566 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 567 // java.lang.StackTraceElement as a convenience. 568 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 569 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 570 SetClassRoot(kJavaLangClassNotFoundException, 571 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 572 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 573 SetClassRoot(kJavaLangStackTraceElementArrayClass, 574 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 575 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 576 577 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly 578 // initialized. 579 { 580 const DexFile& dex_file = java_lang_Object->GetDexFile(); 581 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 582 CHECK(void_string_id != nullptr); 583 uint32_t void_string_index = dex_file.GetIndexForStringId(*void_string_id); 584 const DexFile::TypeId* void_type_id = dex_file.FindTypeId(void_string_index); 585 CHECK(void_type_id != nullptr); 586 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id); 587 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class 588 // as referrer so the used dex cache is core's one. 589 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get()); 590 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid)); 591 self->AssertNoPendingException(); 592 } 593 594 FinishInit(self); 595 596 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 597} 598 599void ClassLinker::FinishInit(Thread* self) { 600 VLOG(startup) << "ClassLinker::FinishInit entering"; 601 602 // Let the heap know some key offsets into java.lang.ref instances 603 // Note: we hard code the field indexes here rather than using FindInstanceField 604 // as the types of the field can't be resolved prior to the runtime being 605 // fully initialized 606 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 607 mirror::Class* java_lang_ref_FinalizerReference = 608 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 609 610 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 611 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 612 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 613 614 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 615 CHECK_STREQ(queue->GetName(), "queue"); 616 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 617 618 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 619 CHECK_STREQ(queueNext->GetName(), "queueNext"); 620 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 621 622 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 623 CHECK_STREQ(referent->GetName(), "referent"); 624 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 625 626 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 627 CHECK_STREQ(zombie->GetName(), "zombie"); 628 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 629 630 // ensure all class_roots_ are initialized 631 for (size_t i = 0; i < kClassRootsMax; i++) { 632 ClassRoot class_root = static_cast<ClassRoot>(i); 633 mirror::Class* klass = GetClassRoot(class_root); 634 CHECK(klass != nullptr); 635 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 636 // note SetClassRoot does additional validation. 637 // if possible add new checks there to catch errors early 638 } 639 640 CHECK(!array_iftable_.IsNull()); 641 642 // disable the slow paths in FindClass and CreatePrimitiveClass now 643 // that Object, Class, and Object[] are setup 644 init_done_ = true; 645 646 VLOG(startup) << "ClassLinker::FinishInit exiting"; 647} 648 649void ClassLinker::RunRootClinits() { 650 Thread* self = Thread::Current(); 651 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 652 mirror::Class* c = GetClassRoot(ClassRoot(i)); 653 if (!c->IsArrayClass() && !c->IsPrimitive()) { 654 StackHandleScope<1> hs(self); 655 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 656 EnsureInitialized(self, h_class, true, true); 657 self->AssertNoPendingException(); 658 } 659 } 660} 661 662const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 663 WriterMutexLock mu(Thread::Current(), dex_lock_); 664 if (kIsDebugBuild) { 665 for (size_t i = 0; i < oat_files_.size(); ++i) { 666 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 667 } 668 } 669 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 670 oat_files_.push_back(oat_file); 671 return oat_file; 672} 673 674OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 675 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 676 OatFile* oat_file = space->ReleaseOatFile(); 677 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 678 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 679 return *oat_file; 680} 681 682const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 683 const char* dex_location = dex_file.GetLocation().c_str(); 684 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 685 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 686} 687 688const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 689 const char* dex_location, 690 const uint32_t* dex_location_checksum) { 691 ReaderMutexLock mu(Thread::Current(), dex_lock_); 692 for (const OatFile* oat_file : oat_files_) { 693 DCHECK(oat_file != nullptr); 694 695 if (oat_location != nullptr) { 696 if (oat_file->GetLocation() != oat_location) { 697 continue; 698 } 699 } 700 701 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 702 dex_location_checksum, 703 false); 704 if (oat_dex_file != nullptr) { 705 return oat_dex_file; 706 } 707 } 708 return nullptr; 709} 710 711std::vector<std::unique_ptr<const DexFile>> ClassLinker::OpenDexFilesFromOat( 712 const char* dex_location, const char* oat_location, 713 std::vector<std::string>* error_msgs) { 714 CHECK(error_msgs != nullptr); 715 716 // Verify we aren't holding the mutator lock, which could starve GC if we 717 // have to generate or relocate an oat file. 718 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); 719 720 OatFileAssistant oat_file_assistant(dex_location, oat_location, kRuntimeISA, 721 !Runtime::Current()->IsAotCompiler()); 722 723 // Lock the target oat location to avoid races generating and loading the 724 // oat file. 725 std::string error_msg; 726 if (!oat_file_assistant.Lock(&error_msg)) { 727 // Don't worry too much if this fails. If it does fail, it's unlikely we 728 // can generate an oat file anyway. 729 VLOG(class_linker) << "OatFileAssistant::Lock: " << error_msg; 730 } 731 732 // Check if we already have an up-to-date oat file open. 733 const OatFile* source_oat_file = nullptr; 734 { 735 ReaderMutexLock mu(Thread::Current(), dex_lock_); 736 for (const OatFile* oat_file : oat_files_) { 737 CHECK(oat_file != nullptr); 738 if (oat_file_assistant.GivenOatFileIsUpToDate(*oat_file)) { 739 source_oat_file = oat_file; 740 break; 741 } 742 } 743 } 744 745 // If we didn't have an up-to-date oat file open, try to load one from disk. 746 if (source_oat_file == nullptr) { 747 // Update the oat file on disk if we can. This may fail, but that's okay. 748 // Best effort is all that matters here. 749 if (!oat_file_assistant.MakeUpToDate(&error_msg)) { 750 LOG(WARNING) << error_msg; 751 } 752 753 // Get the oat file on disk. 754 std::unique_ptr<OatFile> oat_file = oat_file_assistant.GetBestOatFile(); 755 if (oat_file.get() != nullptr) { 756 source_oat_file = oat_file.release(); 757 RegisterOatFile(source_oat_file); 758 } 759 } 760 761 std::vector<std::unique_ptr<const DexFile>> dex_files; 762 763 // Load the dex files from the oat file. 764 if (source_oat_file != nullptr) { 765 dex_files = oat_file_assistant.LoadDexFiles(*source_oat_file, dex_location); 766 if (dex_files.empty()) { 767 error_msgs->push_back("Failed to open dex files from " 768 + source_oat_file->GetLocation()); 769 } 770 } 771 772 // Fall back to running out of the original dex file if we couldn't load any 773 // dex_files from the oat file. 774 if (dex_files.empty()) { 775 if (Runtime::Current()->IsDexFileFallbackEnabled()) { 776 if (!DexFile::Open(dex_location, dex_location, &error_msg, &dex_files)) { 777 LOG(WARNING) << error_msg; 778 error_msgs->push_back("Failed to open dex files from " 779 + std::string(dex_location)); 780 } 781 } else { 782 error_msgs->push_back("Fallback mode disabled, skipping dex files."); 783 } 784 } 785 return dex_files; 786} 787 788const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 789 ReaderMutexLock mu(Thread::Current(), dex_lock_); 790 for (size_t i = 0; i < oat_files_.size(); i++) { 791 const OatFile* oat_file = oat_files_[i]; 792 DCHECK(oat_file != nullptr); 793 if (oat_file->GetLocation() == oat_location) { 794 return oat_file; 795 } 796 } 797 return nullptr; 798} 799 800void ClassLinker::InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) { 801 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 802 DCHECK(obj != nullptr); 803 DCHECK(class_linker != nullptr); 804 if (obj->IsArtMethod()) { 805 mirror::ArtMethod* method = obj->AsArtMethod(); 806 if (!method->IsNative()) { 807 const size_t pointer_size = class_linker->image_pointer_size_; 808 method->SetEntryPointFromInterpreterPtrSize(artInterpreterToInterpreterBridge, pointer_size); 809 if (!method->IsRuntimeMethod() && method != Runtime::Current()->GetResolutionMethod()) { 810 method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(), 811 pointer_size); 812 } 813 } 814 } 815} 816 817void ClassLinker::InitFromImage() { 818 VLOG(startup) << "ClassLinker::InitFromImage entering"; 819 CHECK(!init_done_); 820 821 Thread* self = Thread::Current(); 822 gc::Heap* heap = Runtime::Current()->GetHeap(); 823 gc::space::ImageSpace* space = heap->GetImageSpace(); 824 dex_cache_image_class_lookup_required_ = true; 825 CHECK(space != nullptr); 826 OatFile& oat_file = GetImageOatFile(space); 827 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 828 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 829 const char* image_file_location = oat_file.GetOatHeader(). 830 GetStoreValueByKey(OatHeader::kImageLocationKey); 831 CHECK(image_file_location == nullptr || *image_file_location == 0); 832 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 833 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 834 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 835 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 836 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 837 mirror::ObjectArray<mirror::DexCache>* dex_caches = 838 dex_caches_object->AsObjectArray<mirror::DexCache>(); 839 840 StackHandleScope<1> hs(self); 841 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 842 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 843 AsObjectArray<mirror::Class>())); 844 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 845 846 // Special case of setting up the String class early so that we can test arbitrary objects 847 // as being Strings or not 848 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 849 850 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 851 static_cast<uint32_t>(dex_caches->GetLength())); 852 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 853 StackHandleScope<1> hs2(self); 854 Handle<mirror::DexCache> dex_cache(hs2.NewHandle(dex_caches->Get(i))); 855 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 856 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 857 nullptr); 858 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 859 std::string error_msg; 860 std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg); 861 if (dex_file.get() == nullptr) { 862 LOG(FATAL) << "Failed to open dex file " << dex_file_location 863 << " from within oat file " << oat_file.GetLocation() 864 << " error '" << error_msg << "'"; 865 UNREACHABLE(); 866 } 867 868 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 869 870 AppendToBootClassPath(*dex_file.get(), dex_cache); 871 opened_dex_files_.push_back(std::move(dex_file)); 872 } 873 874 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 875 // bitmap walk. 876 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 877 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 878 if (!Runtime::Current()->IsAotCompiler()) { 879 // Aot compiler supports having an image with a different pointer size than the runtime. This 880 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 881 // also use 32 bit dex2oat on a system with 64 bit apps. 882 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 883 << sizeof(void*); 884 } 885 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 886 image_pointer_size_ = 4; 887 } else { 888 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 889 image_pointer_size_ = 8; 890 } 891 892 // Set entry point to interpreter if in InterpretOnly mode. 893 Runtime* runtime = Runtime::Current(); 894 if (!runtime->IsAotCompiler() && runtime->GetInstrumentation()->InterpretOnly()) { 895 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 896 } 897 898 // reinit class_roots_ 899 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 900 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 901 902 // reinit array_iftable_ from any array class instance, they should be == 903 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 904 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 905 // String class root was set above 906 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 907 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 908 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 909 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 910 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 911 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 912 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 913 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 914 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 915 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 916 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 917 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 918 919 FinishInit(self); 920 921 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 922} 923 924void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 925 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 926 if ((flags & kVisitRootFlagAllRoots) != 0) { 927 for (GcRoot<mirror::Class>& root : class_table_) { 928 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 929 } 930 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 931 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 932 } 933 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 934 for (auto& root : new_class_roots_) { 935 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 936 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 937 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 938 if (UNLIKELY(new_ref != old_ref)) { 939 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 940 // corresponding object. This is slow, but luckily for us, this may only happen with a 941 // concurrent moving GC. 942 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 943 DCHECK(it != class_table_.end()); 944 *it = GcRoot<mirror::Class>(new_ref); 945 } 946 } 947 } 948 if ((flags & kVisitRootFlagClearRootLog) != 0) { 949 new_class_roots_.clear(); 950 } 951 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 952 log_new_class_table_roots_ = true; 953 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 954 log_new_class_table_roots_ = false; 955 } 956 // We deliberately ignore the class roots in the image since we 957 // handle image roots by using the MS/CMS rescanning of dirty cards. 958} 959 960// Keep in sync with InitCallback. Anything we visit, we need to 961// reinit references to when reinitializing a ClassLinker from a 962// mapped image. 963void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 964 class_roots_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 965 Thread* self = Thread::Current(); 966 { 967 ReaderMutexLock mu(self, dex_lock_); 968 if ((flags & kVisitRootFlagAllRoots) != 0) { 969 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 970 dex_cache.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 971 } 972 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 973 for (size_t index : new_dex_cache_roots_) { 974 dex_caches_[index].VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 975 } 976 } 977 if ((flags & kVisitRootFlagClearRootLog) != 0) { 978 new_dex_cache_roots_.clear(); 979 } 980 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 981 log_new_dex_caches_roots_ = true; 982 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 983 log_new_dex_caches_roots_ = false; 984 } 985 } 986 VisitClassRoots(callback, arg, flags); 987 array_iftable_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 988 DCHECK(!array_iftable_.IsNull()); 989 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 990 find_array_class_cache_[i].VisitRootIfNonNull(callback, arg, RootInfo(kRootVMInternal)); 991 } 992} 993 994void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 995 if (dex_cache_image_class_lookup_required_) { 996 MoveImageClassesToClassTable(); 997 } 998 // TODO: why isn't this a ReaderMutexLock? 999 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1000 for (GcRoot<mirror::Class>& root : class_table_) { 1001 if (!visitor(root.Read(), arg)) { 1002 return; 1003 } 1004 } 1005 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1006 if (!visitor(root.Read(), arg)) { 1007 return; 1008 } 1009 } 1010} 1011 1012static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1013 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1014 classes->insert(c); 1015 return true; 1016} 1017 1018struct GetClassesVisitorArrayArg { 1019 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1020 int32_t index; 1021 bool success; 1022}; 1023 1024static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1025 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1026 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1027 if (arg->index < (*arg->classes)->GetLength()) { 1028 (*arg->classes)->Set(arg->index, c); 1029 arg->index++; 1030 return true; 1031 } else { 1032 arg->success = false; 1033 return false; 1034 } 1035} 1036 1037void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1038 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1039 // is avoiding duplicates. 1040 if (!kMovingClasses) { 1041 std::set<mirror::Class*> classes; 1042 VisitClasses(GetClassesVisitorSet, &classes); 1043 for (mirror::Class* klass : classes) { 1044 if (!visitor(klass, arg)) { 1045 return; 1046 } 1047 } 1048 } else { 1049 Thread* self = Thread::Current(); 1050 StackHandleScope<1> hs(self); 1051 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1052 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1053 GetClassesVisitorArrayArg local_arg; 1054 local_arg.classes = &classes; 1055 local_arg.success = false; 1056 // We size the array assuming classes won't be added to the class table during the visit. 1057 // If this assumption fails we iterate again. 1058 while (!local_arg.success) { 1059 size_t class_table_size; 1060 { 1061 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1062 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1063 } 1064 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1065 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1066 classes.Assign( 1067 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1068 CHECK(classes.Get() != nullptr); // OOME. 1069 local_arg.index = 0; 1070 local_arg.success = true; 1071 VisitClasses(GetClassesVisitorArray, &local_arg); 1072 } 1073 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1074 // If the class table shrank during creation of the clases array we expect null elements. If 1075 // the class table grew then the loop repeats. If classes are created after the loop has 1076 // finished then we don't visit. 1077 mirror::Class* klass = classes->Get(i); 1078 if (klass != nullptr && !visitor(klass, arg)) { 1079 return; 1080 } 1081 } 1082 } 1083} 1084 1085ClassLinker::~ClassLinker() { 1086 mirror::Class::ResetClass(); 1087 mirror::String::ResetClass(); 1088 mirror::Reference::ResetClass(); 1089 mirror::ArtField::ResetClass(); 1090 mirror::ArtMethod::ResetClass(); 1091 mirror::BooleanArray::ResetArrayClass(); 1092 mirror::ByteArray::ResetArrayClass(); 1093 mirror::CharArray::ResetArrayClass(); 1094 mirror::DoubleArray::ResetArrayClass(); 1095 mirror::FloatArray::ResetArrayClass(); 1096 mirror::IntArray::ResetArrayClass(); 1097 mirror::LongArray::ResetArrayClass(); 1098 mirror::ShortArray::ResetArrayClass(); 1099 mirror::Throwable::ResetClass(); 1100 mirror::StackTraceElement::ResetClass(); 1101 STLDeleteElements(&oat_files_); 1102} 1103 1104mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1105 gc::Heap* heap = Runtime::Current()->GetHeap(); 1106 StackHandleScope<16> hs(self); 1107 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1108 Handle<mirror::DexCache> dex_cache( 1109 hs.NewHandle(down_cast<mirror::DexCache*>( 1110 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1111 VoidFunctor())))); 1112 if (dex_cache.Get() == nullptr) { 1113 return nullptr; 1114 } 1115 Handle<mirror::String> 1116 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1117 if (location.Get() == nullptr) { 1118 return nullptr; 1119 } 1120 Handle<mirror::ObjectArray<mirror::String>> 1121 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1122 if (strings.Get() == nullptr) { 1123 return nullptr; 1124 } 1125 Handle<mirror::ObjectArray<mirror::Class>> 1126 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1127 if (types.Get() == nullptr) { 1128 return nullptr; 1129 } 1130 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1131 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1132 if (methods.Get() == nullptr) { 1133 return nullptr; 1134 } 1135 Handle<mirror::ObjectArray<mirror::ArtField>> 1136 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1137 if (fields.Get() == nullptr) { 1138 return nullptr; 1139 } 1140 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1141 fields.Get()); 1142 return dex_cache.Get(); 1143} 1144 1145mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1146 uint32_t class_size) { 1147 DCHECK_GE(class_size, sizeof(mirror::Class)); 1148 gc::Heap* heap = Runtime::Current()->GetHeap(); 1149 mirror::Class::InitializeClassVisitor visitor(class_size); 1150 mirror::Object* k = kMovingClasses ? 1151 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1152 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1153 if (UNLIKELY(k == nullptr)) { 1154 CHECK(self->IsExceptionPending()); // OOME. 1155 return nullptr; 1156 } 1157 return k->AsClass(); 1158} 1159 1160mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1161 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1162} 1163 1164mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1165 return down_cast<mirror::ArtField*>( 1166 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1167} 1168 1169mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1170 return down_cast<mirror::ArtMethod*>( 1171 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1172} 1173 1174mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1175 Thread* self, size_t length) { 1176 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1177 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1178} 1179 1180mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1181 mirror::Class* klass) { 1182 DCHECK(klass != nullptr); 1183 1184 // For temporary classes we must wait for them to be retired. 1185 if (init_done_ && klass->IsTemp()) { 1186 CHECK(!klass->IsResolved()); 1187 if (klass->IsErroneous()) { 1188 ThrowEarlierClassFailure(klass); 1189 return nullptr; 1190 } 1191 StackHandleScope<1> hs(self); 1192 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1193 ObjectLock<mirror::Class> lock(self, h_class); 1194 // Loop and wait for the resolving thread to retire this class. 1195 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1196 lock.WaitIgnoringInterrupts(); 1197 } 1198 if (h_class->IsErroneous()) { 1199 ThrowEarlierClassFailure(h_class.Get()); 1200 return nullptr; 1201 } 1202 CHECK(h_class->IsRetired()); 1203 // Get the updated class from class table. 1204 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor), 1205 h_class.Get()->GetClassLoader()); 1206 } 1207 1208 // Wait for the class if it has not already been linked. 1209 if (!klass->IsResolved() && !klass->IsErroneous()) { 1210 StackHandleScope<1> hs(self); 1211 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1212 ObjectLock<mirror::Class> lock(self, h_class); 1213 // Check for circular dependencies between classes. 1214 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1215 ThrowClassCircularityError(h_class.Get()); 1216 mirror::Class::SetStatus(h_class, mirror::Class::kStatusError, self); 1217 return nullptr; 1218 } 1219 // Wait for the pending initialization to complete. 1220 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1221 lock.WaitIgnoringInterrupts(); 1222 } 1223 } 1224 1225 if (klass->IsErroneous()) { 1226 ThrowEarlierClassFailure(klass); 1227 return nullptr; 1228 } 1229 // Return the loaded class. No exceptions should be pending. 1230 CHECK(klass->IsResolved()) << PrettyClass(klass); 1231 self->AssertNoPendingException(); 1232 return klass; 1233} 1234 1235typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1236 1237// Search a collection of DexFiles for a descriptor 1238ClassPathEntry FindInClassPath(const char* descriptor, 1239 size_t hash, const std::vector<const DexFile*>& class_path) { 1240 for (const DexFile* dex_file : class_path) { 1241 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 1242 if (dex_class_def != nullptr) { 1243 return ClassPathEntry(dex_file, dex_class_def); 1244 } 1245 } 1246 return ClassPathEntry(nullptr, nullptr); 1247} 1248 1249mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 1250 Thread* self, const char* descriptor, 1251 size_t hash, 1252 Handle<mirror::ClassLoader> class_loader) { 1253 // Can we special case for a well understood PathClassLoader with the BootClassLoader as parent? 1254 if (class_loader->GetClass() != 1255 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 1256 class_loader->GetParent()->GetClass() != 1257 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 1258 return nullptr; 1259 } 1260 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 1261 // Check if this would be found in the parent boot class loader. 1262 if (pair.second != nullptr) { 1263 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr); 1264 if (klass != nullptr) { 1265 // May return null if resolution on another thread fails. 1266 klass = EnsureResolved(self, descriptor, klass); 1267 } else { 1268 // May OOME. 1269 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 1270 *pair.second); 1271 } 1272 if (klass == nullptr) { 1273 CHECK(self->IsExceptionPending()) << descriptor; 1274 self->ClearException(); 1275 } 1276 return klass; 1277 } else { 1278 // Handle as if this is the child PathClassLoader. 1279 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension). 1280 StackHandleScope<3> hs(self); 1281 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 1282 // We need to get the DexPathList and loop through it. 1283 Handle<mirror::ArtField> cookie_field = 1284 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 1285 Handle<mirror::ArtField> dex_file_field = 1286 hs.NewHandle( 1287 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 1288 mirror::Object* dex_path_list = 1289 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 1290 GetObject(class_loader.Get()); 1291 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 1292 cookie_field.Get() != nullptr) { 1293 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 1294 mirror::Object* dex_elements_obj = 1295 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 1296 GetObject(dex_path_list); 1297 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 1298 // at the mCookie which is a DexFile vector. 1299 if (dex_elements_obj != nullptr) { 1300 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 1301 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 1302 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 1303 mirror::Object* element = dex_elements->GetWithoutChecks(i); 1304 if (element == nullptr) { 1305 // Should never happen, fall back to java code to throw a NPE. 1306 break; 1307 } 1308 mirror::Object* dex_file = dex_file_field->GetObject(element); 1309 if (dex_file != nullptr) { 1310 mirror::LongArray* long_array = cookie_field->GetObject(dex_file)->AsLongArray(); 1311 if (long_array == nullptr) { 1312 // This should never happen so log a warning. 1313 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 1314 break; 1315 } 1316 int32_t long_array_size = long_array->GetLength(); 1317 for (int32_t j = 0; j < long_array_size; ++j) { 1318 const DexFile* cp_dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>( 1319 long_array->GetWithoutChecks(j))); 1320 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash); 1321 if (dex_class_def != nullptr) { 1322 RegisterDexFile(*cp_dex_file); 1323 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, 1324 *cp_dex_file, *dex_class_def); 1325 if (klass == nullptr) { 1326 CHECK(self->IsExceptionPending()) << descriptor; 1327 self->ClearException(); 1328 return nullptr; 1329 } 1330 return klass; 1331 } 1332 } 1333 } 1334 } 1335 } 1336 } 1337 self->AssertNoPendingException(); 1338 return nullptr; 1339 } 1340} 1341 1342mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1343 Handle<mirror::ClassLoader> class_loader) { 1344 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1345 DCHECK(self != nullptr); 1346 self->AssertNoPendingException(); 1347 if (descriptor[1] == '\0') { 1348 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1349 // for primitive classes that aren't backed by dex files. 1350 return FindPrimitiveClass(descriptor[0]); 1351 } 1352 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 1353 // Find the class in the loaded classes table. 1354 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get()); 1355 if (klass != nullptr) { 1356 return EnsureResolved(self, descriptor, klass); 1357 } 1358 // Class is not yet loaded. 1359 if (descriptor[0] == '[') { 1360 return CreateArrayClass(self, descriptor, hash, class_loader); 1361 } else if (class_loader.Get() == nullptr) { 1362 // The boot class loader, search the boot class path. 1363 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 1364 if (pair.second != nullptr) { 1365 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 1366 *pair.second); 1367 } else { 1368 // The boot class loader is searched ahead of the application class loader, failures are 1369 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 1370 // trigger the chaining with a proper stack trace. 1371 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 1372 self->SetException(pre_allocated); 1373 return nullptr; 1374 } 1375 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1376 // First try with the bootstrap class loader. 1377 if (class_loader.Get() != nullptr) { 1378 klass = LookupClass(self, descriptor, hash, nullptr); 1379 if (klass != nullptr) { 1380 return EnsureResolved(self, descriptor, klass); 1381 } 1382 } 1383 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 1384 // a NoClassDefFoundError being allocated. 1385 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 1386 if (pair.second != nullptr) { 1387 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 1388 *pair.second); 1389 } 1390 // Next try the compile time class path. 1391 const std::vector<const DexFile*>* class_path; 1392 { 1393 ScopedObjectAccessUnchecked soa(self); 1394 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1395 soa.AddLocalReference<jobject>(class_loader.Get())); 1396 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1397 } 1398 pair = FindInClassPath(descriptor, hash, *class_path); 1399 if (pair.second != nullptr) { 1400 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 1401 } else { 1402 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 1403 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 1404 self->SetException(pre_allocated); 1405 return nullptr; 1406 } 1407 } else { 1408 ScopedObjectAccessUnchecked soa(self); 1409 mirror::Class* cp_klass = FindClassInPathClassLoader(soa, self, descriptor, hash, 1410 class_loader); 1411 if (cp_klass != nullptr) { 1412 return cp_klass; 1413 } 1414 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1415 soa.AddLocalReference<jobject>(class_loader.Get())); 1416 std::string class_name_string(DescriptorToDot(descriptor)); 1417 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 1418 { 1419 ScopedThreadStateChange tsc(self, kNative); 1420 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1421 soa.Env()->NewStringUTF(class_name_string.c_str())); 1422 if (class_name_object.get() == nullptr) { 1423 DCHECK(self->IsExceptionPending()); // OOME. 1424 return nullptr; 1425 } 1426 CHECK(class_loader_object.get() != nullptr); 1427 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1428 WellKnownClasses::java_lang_ClassLoader_loadClass, 1429 class_name_object.get())); 1430 } 1431 if (self->IsExceptionPending()) { 1432 // If the ClassLoader threw, pass that exception up. 1433 return nullptr; 1434 } else if (result.get() == nullptr) { 1435 // broken loader - throw NPE to be compatible with Dalvik 1436 ThrowNullPointerException(StringPrintf("ClassLoader.loadClass returned null for %s", 1437 class_name_string.c_str()).c_str()); 1438 return nullptr; 1439 } else { 1440 // success, return mirror::Class* 1441 return soa.Decode<mirror::Class*>(result.get()); 1442 } 1443 } 1444 UNREACHABLE(); 1445} 1446 1447mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 1448 Handle<mirror::ClassLoader> class_loader, 1449 const DexFile& dex_file, 1450 const DexFile::ClassDef& dex_class_def) { 1451 StackHandleScope<3> hs(self); 1452 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1453 1454 // Load the class from the dex file. 1455 if (UNLIKELY(!init_done_)) { 1456 // finish up init of hand crafted class_roots_ 1457 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1458 klass.Assign(GetClassRoot(kJavaLangObject)); 1459 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1460 klass.Assign(GetClassRoot(kJavaLangClass)); 1461 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1462 klass.Assign(GetClassRoot(kJavaLangString)); 1463 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1464 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1465 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1466 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1467 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1468 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1469 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1470 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1471 } 1472 } 1473 1474 if (klass.Get() == nullptr) { 1475 // Allocate a class with the status of not ready. 1476 // Interface object should get the right size here. Regular class will 1477 // figure out the right size later and be replaced with one of the right 1478 // size when the class becomes resolved. 1479 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1480 } 1481 if (UNLIKELY(klass.Get() == nullptr)) { 1482 CHECK(self->IsExceptionPending()); // Expect an OOME. 1483 return nullptr; 1484 } 1485 klass->SetDexCache(FindDexCache(dex_file)); 1486 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 1487 ObjectLock<mirror::Class> lock(self, klass); 1488 if (self->IsExceptionPending()) { 1489 // An exception occured during load, set status to erroneous while holding klass' lock in case 1490 // notification is necessary. 1491 if (!klass->IsErroneous()) { 1492 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 1493 } 1494 return nullptr; 1495 } 1496 klass->SetClinitThreadId(self->GetTid()); 1497 1498 // Add the newly loaded class to the loaded classes table. 1499 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 1500 if (existing != nullptr) { 1501 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1502 // this thread to block. 1503 return EnsureResolved(self, descriptor, existing); 1504 } 1505 1506 // Finish loading (if necessary) by finding parents 1507 CHECK(!klass->IsLoaded()); 1508 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1509 // Loading failed. 1510 if (!klass->IsErroneous()) { 1511 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 1512 } 1513 return nullptr; 1514 } 1515 CHECK(klass->IsLoaded()); 1516 // Link the class (if necessary) 1517 CHECK(!klass->IsResolved()); 1518 // TODO: Use fast jobjects? 1519 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1520 1521 mirror::Class* new_class = nullptr; 1522 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1523 // Linking failed. 1524 if (!klass->IsErroneous()) { 1525 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 1526 } 1527 return nullptr; 1528 } 1529 self->AssertNoPendingException(); 1530 CHECK(new_class != nullptr) << descriptor; 1531 CHECK(new_class->IsResolved()) << descriptor; 1532 1533 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1534 1535 // Instrumentation may have updated entrypoints for all methods of all 1536 // classes. However it could not update methods of this class while we 1537 // were loading it. Now the class is resolved, we can update entrypoints 1538 // as required by instrumentation. 1539 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 1540 // We must be in the kRunnable state to prevent instrumentation from 1541 // suspending all threads to update entrypoints while we are doing it 1542 // for this class. 1543 DCHECK_EQ(self->GetState(), kRunnable); 1544 Runtime::Current()->GetInstrumentation()->InstallStubsForClass(new_class_h.Get()); 1545 } 1546 1547 /* 1548 * We send CLASS_PREPARE events to the debugger from here. The 1549 * definition of "preparation" is creating the static fields for a 1550 * class and initializing them to the standard default values, but not 1551 * executing any code (that comes later, during "initialization"). 1552 * 1553 * We did the static preparation in LinkClass. 1554 * 1555 * The class has been prepared and resolved but possibly not yet verified 1556 * at this point. 1557 */ 1558 Dbg::PostClassPrepare(new_class_h.Get()); 1559 1560 return new_class_h.Get(); 1561} 1562 1563uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1564 const DexFile::ClassDef& dex_class_def) { 1565 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 1566 size_t num_ref = 0; 1567 size_t num_8 = 0; 1568 size_t num_16 = 0; 1569 size_t num_32 = 0; 1570 size_t num_64 = 0; 1571 if (class_data != nullptr) { 1572 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1573 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1574 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1575 char c = descriptor[0]; 1576 switch (c) { 1577 case 'L': 1578 case '[': 1579 num_ref++; 1580 break; 1581 case 'J': 1582 case 'D': 1583 num_64++; 1584 break; 1585 case 'I': 1586 case 'F': 1587 num_32++; 1588 break; 1589 case 'S': 1590 case 'C': 1591 num_16++; 1592 break; 1593 case 'B': 1594 case 'Z': 1595 num_8++; 1596 break; 1597 default: 1598 LOG(FATAL) << "Unknown descriptor: " << c; 1599 UNREACHABLE(); 1600 } 1601 } 1602 } 1603 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 1604} 1605 1606OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 1607 bool* found) { 1608 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1609 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 1610 if (oat_dex_file == nullptr) { 1611 *found = false; 1612 return OatFile::OatClass::Invalid(); 1613 } 1614 *found = true; 1615 return oat_dex_file->GetOatClass(class_def_idx); 1616} 1617 1618static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1619 uint32_t method_idx) { 1620 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1621 const uint8_t* class_data = dex_file.GetClassData(class_def); 1622 CHECK(class_data != nullptr); 1623 ClassDataItemIterator it(dex_file, class_data); 1624 // Skip fields 1625 while (it.HasNextStaticField()) { 1626 it.Next(); 1627 } 1628 while (it.HasNextInstanceField()) { 1629 it.Next(); 1630 } 1631 // Process methods 1632 size_t class_def_method_index = 0; 1633 while (it.HasNextDirectMethod()) { 1634 if (it.GetMemberIndex() == method_idx) { 1635 return class_def_method_index; 1636 } 1637 class_def_method_index++; 1638 it.Next(); 1639 } 1640 while (it.HasNextVirtualMethod()) { 1641 if (it.GetMemberIndex() == method_idx) { 1642 return class_def_method_index; 1643 } 1644 class_def_method_index++; 1645 it.Next(); 1646 } 1647 DCHECK(!it.HasNext()); 1648 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1649 UNREACHABLE(); 1650} 1651 1652const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 1653 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1654 // method for direct methods (or virtual methods made direct). 1655 mirror::Class* declaring_class = method->GetDeclaringClass(); 1656 size_t oat_method_index; 1657 if (method->IsStatic() || method->IsDirect()) { 1658 // Simple case where the oat method index was stashed at load time. 1659 oat_method_index = method->GetMethodIndex(); 1660 } else { 1661 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1662 // by search for its position in the declared virtual methods. 1663 oat_method_index = declaring_class->NumDirectMethods(); 1664 size_t end = declaring_class->NumVirtualMethods(); 1665 bool found_virtual = false; 1666 for (size_t i = 0; i < end; i++) { 1667 // Check method index instead of identity in case of duplicate method definitions. 1668 if (method->GetDexMethodIndex() == 1669 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 1670 found_virtual = true; 1671 break; 1672 } 1673 oat_method_index++; 1674 } 1675 CHECK(found_virtual) << "Didn't find oat method index for virtual method: " 1676 << PrettyMethod(method); 1677 } 1678 DCHECK_EQ(oat_method_index, 1679 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1680 method->GetDeclaringClass()->GetDexClassDefIndex(), 1681 method->GetDexMethodIndex())); 1682 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1683 declaring_class->GetDexClassDefIndex(), 1684 found); 1685 if (!(*found)) { 1686 return OatFile::OatMethod::Invalid(); 1687 } 1688 return oat_class.GetOatMethod(oat_method_index); 1689} 1690 1691// Special case to get oat code without overwriting a trampoline. 1692const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1693 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1694 if (method->IsProxyMethod()) { 1695 return GetQuickProxyInvokeHandler(); 1696 } 1697 bool found; 1698 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 1699 if (found) { 1700 auto* code = oat_method.GetQuickCode(); 1701 if (code != nullptr) { 1702 return code; 1703 } 1704 } 1705 jit::Jit* const jit = Runtime::Current()->GetJit(); 1706 if (jit != nullptr) { 1707 auto* code = jit->GetCodeCache()->GetCodeFor(method); 1708 if (code != nullptr) { 1709 return code; 1710 } 1711 } 1712 if (method->IsNative()) { 1713 // No code and native? Use generic trampoline. 1714 return GetQuickGenericJniStub(); 1715 } 1716 return GetQuickToInterpreterBridge(); 1717} 1718 1719const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 1720 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 1721 return nullptr; 1722 } 1723 bool found; 1724 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 1725 if (found) { 1726 return oat_method.GetQuickCode(); 1727 } 1728 jit::Jit* jit = Runtime::Current()->GetJit(); 1729 if (jit != nullptr) { 1730 auto* code = jit->GetCodeCache()->GetCodeFor(method); 1731 if (code != nullptr) { 1732 return code; 1733 } 1734 } 1735 return nullptr; 1736} 1737 1738const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1739 uint32_t method_idx) { 1740 bool found; 1741 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 1742 if (!found) { 1743 return nullptr; 1744 } 1745 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1746 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1747} 1748 1749// Returns true if the method must run with interpreter, false otherwise. 1750static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code) 1751 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1752 if (quick_code == nullptr) { 1753 // No code: need interpreter. 1754 // May return true for native code, in the case of generic JNI 1755 // DCHECK(!method->IsNative()); 1756 return true; 1757 } 1758 // If interpreter mode is enabled, every method (except native and proxy) must 1759 // be run with interpreter. 1760 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1761 !method->IsNative() && !method->IsProxyMethod(); 1762} 1763 1764void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1765 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1766 if (klass->NumDirectMethods() == 0) { 1767 return; // No direct methods => no static methods. 1768 } 1769 Runtime* runtime = Runtime::Current(); 1770 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1771 if (runtime->IsAotCompiler() || runtime->GetHeap()->HasImageSpace()) { 1772 return; // OAT file unavailable. 1773 } 1774 } 1775 1776 const DexFile& dex_file = klass->GetDexFile(); 1777 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1778 CHECK(dex_class_def != nullptr); 1779 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 1780 // There should always be class data if there were direct methods. 1781 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1782 ClassDataItemIterator it(dex_file, class_data); 1783 // Skip fields 1784 while (it.HasNextStaticField()) { 1785 it.Next(); 1786 } 1787 while (it.HasNextInstanceField()) { 1788 it.Next(); 1789 } 1790 bool has_oat_class; 1791 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 1792 &has_oat_class); 1793 // Link the code of methods skipped by LinkCode. 1794 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1795 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1796 if (!method->IsStatic()) { 1797 // Only update static methods. 1798 continue; 1799 } 1800 const void* quick_code = nullptr; 1801 if (has_oat_class) { 1802 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 1803 quick_code = oat_method.GetQuickCode(); 1804 } 1805 const bool enter_interpreter = NeedsInterpreter(method, quick_code); 1806 if (enter_interpreter) { 1807 // Use interpreter entry point. 1808 // Check whether the method is native, in which case it's generic JNI. 1809 if (quick_code == nullptr && method->IsNative()) { 1810 quick_code = GetQuickGenericJniStub(); 1811 } else { 1812 quick_code = GetQuickToInterpreterBridge(); 1813 } 1814 } 1815 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code); 1816 } 1817 // Ignore virtual methods on the iterator. 1818} 1819 1820void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 1821 const OatFile::OatClass* oat_class, 1822 uint32_t class_def_method_index) { 1823 Runtime* runtime = Runtime::Current(); 1824 if (runtime->IsAotCompiler()) { 1825 // The following code only applies to a non-compiler runtime. 1826 return; 1827 } 1828 // Method shouldn't have already been linked. 1829 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1830 if (oat_class != nullptr) { 1831 // Every kind of method should at least get an invoke stub from the oat_method. 1832 // non-abstract methods also get their code pointers. 1833 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index); 1834 oat_method.LinkMethod(method.Get()); 1835 } 1836 1837 // Install entry point from interpreter. 1838 bool enter_interpreter = NeedsInterpreter(method.Get(), 1839 method->GetEntryPointFromQuickCompiledCode()); 1840 if (enter_interpreter && !method->IsNative()) { 1841 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 1842 } else { 1843 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1844 } 1845 1846 if (method->IsAbstract()) { 1847 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1848 return; 1849 } 1850 1851 if (method->IsStatic() && !method->IsConstructor()) { 1852 // For static methods excluding the class initializer, install the trampoline. 1853 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1854 // after initializing class (see ClassLinker::InitializeClass method). 1855 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 1856 } else if (enter_interpreter) { 1857 if (!method->IsNative()) { 1858 // Set entry point from compiled code if there's no code or in interpreter only mode. 1859 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1860 } else { 1861 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 1862 } 1863 } 1864 1865 if (method->IsNative()) { 1866 // Unregistering restores the dlsym lookup stub. 1867 method->UnregisterNative(); 1868 1869 if (enter_interpreter) { 1870 // We have a native method here without code. Then it should have either the generic JNI 1871 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 1872 // TODO: this doesn't handle all the cases where trampolines may be installed. 1873 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 1874 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 1875 } 1876 } 1877} 1878 1879 1880 1881void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 1882 const DexFile::ClassDef& dex_class_def, 1883 Handle<mirror::Class> klass, 1884 mirror::ClassLoader* class_loader) { 1885 CHECK(klass.Get() != nullptr); 1886 CHECK(klass->GetDexCache() != nullptr); 1887 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1888 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1889 CHECK(descriptor != nullptr); 1890 1891 klass->SetClass(GetClassRoot(kJavaLangClass)); 1892 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 1893 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1894 klass->SetAccessFlags(access_flags); 1895 klass->SetClassLoader(class_loader); 1896 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1897 mirror::Class::SetStatus(klass, mirror::Class::kStatusIdx, nullptr); 1898 1899 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1900 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1901 CHECK(klass->GetDexCacheStrings() != nullptr); 1902 1903 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 1904 if (class_data == nullptr) { 1905 return; // no fields or methods - for example a marker interface 1906 } 1907 1908 1909 bool has_oat_class = false; 1910 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1911 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 1912 &has_oat_class); 1913 if (has_oat_class) { 1914 LoadClassMembers(self, dex_file, class_data, klass, &oat_class); 1915 } 1916 } 1917 if (!has_oat_class) { 1918 LoadClassMembers(self, dex_file, class_data, klass, nullptr); 1919 } 1920} 1921 1922void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 1923 const uint8_t* class_data, 1924 Handle<mirror::Class> klass, 1925 const OatFile::OatClass* oat_class) { 1926 // Load fields. 1927 ClassDataItemIterator it(dex_file, class_data); 1928 if (it.NumStaticFields() != 0) { 1929 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1930 if (UNLIKELY(statics == nullptr)) { 1931 CHECK(self->IsExceptionPending()); // OOME. 1932 return; 1933 } 1934 klass->SetSFields(statics); 1935 } 1936 if (it.NumInstanceFields() != 0) { 1937 mirror::ObjectArray<mirror::ArtField>* fields = 1938 AllocArtFieldArray(self, it.NumInstanceFields()); 1939 if (UNLIKELY(fields == nullptr)) { 1940 CHECK(self->IsExceptionPending()); // OOME. 1941 return; 1942 } 1943 klass->SetIFields(fields); 1944 } 1945 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1946 self->AllowThreadSuspension(); 1947 StackHandleScope<1> hs(self); 1948 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1949 if (UNLIKELY(sfield.Get() == nullptr)) { 1950 CHECK(self->IsExceptionPending()); // OOME. 1951 return; 1952 } 1953 klass->SetStaticField(i, sfield.Get()); 1954 LoadField(dex_file, it, klass, sfield); 1955 } 1956 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1957 self->AllowThreadSuspension(); 1958 StackHandleScope<1> hs(self); 1959 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1960 if (UNLIKELY(ifield.Get() == nullptr)) { 1961 CHECK(self->IsExceptionPending()); // OOME. 1962 return; 1963 } 1964 klass->SetInstanceField(i, ifield.Get()); 1965 LoadField(dex_file, it, klass, ifield); 1966 } 1967 1968 // Load methods. 1969 if (it.NumDirectMethods() != 0) { 1970 // TODO: append direct methods to class object 1971 mirror::ObjectArray<mirror::ArtMethod>* directs = 1972 AllocArtMethodArray(self, it.NumDirectMethods()); 1973 if (UNLIKELY(directs == nullptr)) { 1974 CHECK(self->IsExceptionPending()); // OOME. 1975 return; 1976 } 1977 klass->SetDirectMethods(directs); 1978 } 1979 if (it.NumVirtualMethods() != 0) { 1980 // TODO: append direct methods to class object 1981 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1982 AllocArtMethodArray(self, it.NumVirtualMethods()); 1983 if (UNLIKELY(virtuals == nullptr)) { 1984 CHECK(self->IsExceptionPending()); // OOME. 1985 return; 1986 } 1987 klass->SetVirtualMethods(virtuals); 1988 } 1989 size_t class_def_method_index = 0; 1990 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 1991 size_t last_class_def_method_index = 0; 1992 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1993 self->AllowThreadSuspension(); 1994 StackHandleScope<1> hs(self); 1995 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1996 if (UNLIKELY(method.Get() == nullptr)) { 1997 CHECK(self->IsExceptionPending()); // OOME. 1998 return; 1999 } 2000 klass->SetDirectMethod(i, method.Get()); 2001 LinkCode(method, oat_class, class_def_method_index); 2002 uint32_t it_method_index = it.GetMemberIndex(); 2003 if (last_dex_method_index == it_method_index) { 2004 // duplicate case 2005 method->SetMethodIndex(last_class_def_method_index); 2006 } else { 2007 method->SetMethodIndex(class_def_method_index); 2008 last_dex_method_index = it_method_index; 2009 last_class_def_method_index = class_def_method_index; 2010 } 2011 class_def_method_index++; 2012 } 2013 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2014 self->AllowThreadSuspension(); 2015 StackHandleScope<1> hs(self); 2016 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2017 if (UNLIKELY(method.Get() == nullptr)) { 2018 CHECK(self->IsExceptionPending()); // OOME. 2019 return; 2020 } 2021 klass->SetVirtualMethod(i, method.Get()); 2022 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2023 LinkCode(method, oat_class, class_def_method_index); 2024 class_def_method_index++; 2025 } 2026 DCHECK(!it.HasNext()); 2027} 2028 2029void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2030 Handle<mirror::Class> klass, 2031 Handle<mirror::ArtField> dst) { 2032 uint32_t field_idx = it.GetMemberIndex(); 2033 dst->SetDexFieldIndex(field_idx); 2034 dst->SetDeclaringClass(klass.Get()); 2035 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2036} 2037 2038mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2039 const ClassDataItemIterator& it, 2040 Handle<mirror::Class> klass) { 2041 uint32_t dex_method_idx = it.GetMemberIndex(); 2042 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2043 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2044 2045 mirror::ArtMethod* dst = AllocArtMethod(self); 2046 if (UNLIKELY(dst == nullptr)) { 2047 CHECK(self->IsExceptionPending()); // OOME. 2048 return nullptr; 2049 } 2050 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2051 2052 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2053 dst->SetDexMethodIndex(dex_method_idx); 2054 dst->SetDeclaringClass(klass.Get()); 2055 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2056 2057 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2058 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2059 2060 uint32_t access_flags = it.GetMethodAccessFlags(); 2061 2062 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2063 // Set finalizable flag on declaring class. 2064 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2065 // Void return type. 2066 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2067 klass->SetFinalizable(); 2068 } else { 2069 std::string temp; 2070 const char* klass_descriptor = klass->GetDescriptor(&temp); 2071 // The Enum class declares a "final" finalize() method to prevent subclasses from 2072 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2073 // subclasses, so we exclude it here. 2074 // We also want to avoid setting the flag on Object, where we know that finalize() is 2075 // empty. 2076 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2077 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2078 klass->SetFinalizable(); 2079 } 2080 } 2081 } 2082 } else if (method_name[0] == '<') { 2083 // Fix broken access flags for initializers. Bug 11157540. 2084 bool is_init = (strcmp("<init>", method_name) == 0); 2085 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2086 if (UNLIKELY(!is_init && !is_clinit)) { 2087 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2088 } else { 2089 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2090 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2091 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2092 access_flags |= kAccConstructor; 2093 } 2094 } 2095 } 2096 dst->SetAccessFlags(access_flags); 2097 2098 return dst; 2099} 2100 2101void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2102 StackHandleScope<1> hs(self); 2103 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2104 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2105 << dex_file.GetLocation(); 2106 AppendToBootClassPath(dex_file, dex_cache); 2107} 2108 2109void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2110 Handle<mirror::DexCache> dex_cache) { 2111 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2112 boot_class_path_.push_back(&dex_file); 2113 RegisterDexFile(dex_file, dex_cache); 2114} 2115 2116bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2117 dex_lock_.AssertSharedHeld(Thread::Current()); 2118 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2119 mirror::DexCache* dex_cache = GetDexCache(i); 2120 if (dex_cache->GetDexFile() == &dex_file) { 2121 return true; 2122 } 2123 } 2124 return false; 2125} 2126 2127bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2128 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2129 return IsDexFileRegisteredLocked(dex_file); 2130} 2131 2132void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2133 Handle<mirror::DexCache> dex_cache) { 2134 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2135 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2136 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2137 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2138 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2139 dex_cache->SetDexFile(&dex_file); 2140 if (log_new_dex_caches_roots_) { 2141 // TODO: This is not safe if we can remove dex caches. 2142 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2143 } 2144} 2145 2146void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2147 Thread* self = Thread::Current(); 2148 { 2149 ReaderMutexLock mu(self, dex_lock_); 2150 if (IsDexFileRegisteredLocked(dex_file)) { 2151 return; 2152 } 2153 } 2154 // Don't alloc while holding the lock, since allocation may need to 2155 // suspend all threads and another thread may need the dex_lock_ to 2156 // get to a suspend point. 2157 StackHandleScope<1> hs(self); 2158 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2159 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2160 << dex_file.GetLocation(); 2161 { 2162 WriterMutexLock mu(self, dex_lock_); 2163 if (IsDexFileRegisteredLocked(dex_file)) { 2164 return; 2165 } 2166 RegisterDexFileLocked(dex_file, dex_cache); 2167 } 2168} 2169 2170void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2171 Handle<mirror::DexCache> dex_cache) { 2172 WriterMutexLock mu(Thread::Current(), dex_lock_); 2173 RegisterDexFileLocked(dex_file, dex_cache); 2174} 2175 2176mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2177 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2178 // Search assuming unique-ness of dex file. 2179 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2180 mirror::DexCache* dex_cache = GetDexCache(i); 2181 if (dex_cache->GetDexFile() == &dex_file) { 2182 return dex_cache; 2183 } 2184 } 2185 // Search matching by location name. 2186 std::string location(dex_file.GetLocation()); 2187 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2188 mirror::DexCache* dex_cache = GetDexCache(i); 2189 if (dex_cache->GetDexFile()->GetLocation() == location) { 2190 return dex_cache; 2191 } 2192 } 2193 // Failure, dump diagnostic and abort. 2194 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2195 mirror::DexCache* dex_cache = GetDexCache(i); 2196 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2197 } 2198 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2199 UNREACHABLE(); 2200} 2201 2202void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2203 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2204 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2205 mirror::DexCache* dex_cache = GetDexCache(i); 2206 dex_cache->Fixup(resolution_method); 2207 } 2208} 2209 2210mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2211 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2212 if (UNLIKELY(klass == nullptr)) { 2213 return nullptr; 2214 } 2215 return InitializePrimitiveClass(klass, type); 2216} 2217 2218mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2219 Primitive::Type type) { 2220 CHECK(primitive_class != nullptr); 2221 // Must hold lock on object when initializing. 2222 Thread* self = Thread::Current(); 2223 StackHandleScope<1> hs(self); 2224 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2225 ObjectLock<mirror::Class> lock(self, h_class); 2226 h_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2227 h_class->SetPrimitiveType(type); 2228 mirror::Class::SetStatus(h_class, mirror::Class::kStatusInitialized, self); 2229 const char* descriptor = Primitive::Descriptor(type); 2230 mirror::Class* existing = InsertClass(descriptor, h_class.Get(), 2231 ComputeModifiedUtf8Hash(descriptor)); 2232 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 2233 return h_class.Get(); 2234} 2235 2236// Create an array class (i.e. the class object for the array, not the 2237// array itself). "descriptor" looks like "[C" or "[[[[B" or 2238// "[Ljava/lang/String;". 2239// 2240// If "descriptor" refers to an array of primitives, look up the 2241// primitive type's internally-generated class object. 2242// 2243// "class_loader" is the class loader of the class that's referring to 2244// us. It's used to ensure that we're looking for the element type in 2245// the right context. It does NOT become the class loader for the 2246// array class; that always comes from the base element class. 2247// 2248// Returns nullptr with an exception raised on failure. 2249mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 2250 Handle<mirror::ClassLoader> class_loader) { 2251 // Identify the underlying component type 2252 CHECK_EQ('[', descriptor[0]); 2253 StackHandleScope<2> hs(self); 2254 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 2255 class_loader))); 2256 if (component_type.Get() == nullptr) { 2257 DCHECK(self->IsExceptionPending()); 2258 // We need to accept erroneous classes as component types. 2259 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 2260 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get())); 2261 if (component_type.Get() == nullptr) { 2262 DCHECK(self->IsExceptionPending()); 2263 return nullptr; 2264 } else { 2265 self->ClearException(); 2266 } 2267 } 2268 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2269 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2270 return nullptr; 2271 } 2272 // See if the component type is already loaded. Array classes are 2273 // always associated with the class loader of their underlying 2274 // element type -- an array of Strings goes with the loader for 2275 // java/lang/String -- so we need to look for it there. (The 2276 // caller should have checked for the existence of the class 2277 // before calling here, but they did so with *their* class loader, 2278 // not the component type's loader.) 2279 // 2280 // If we find it, the caller adds "loader" to the class' initiating 2281 // loader list, which should prevent us from going through this again. 2282 // 2283 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2284 // are the same, because our caller (FindClass) just did the 2285 // lookup. (Even if we get this wrong we still have correct behavior, 2286 // because we effectively do this lookup again when we add the new 2287 // class to the hash table --- necessary because of possible races with 2288 // other threads.) 2289 if (class_loader.Get() != component_type->GetClassLoader()) { 2290 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader()); 2291 if (new_class != nullptr) { 2292 return new_class; 2293 } 2294 } 2295 2296 // Fill out the fields in the Class. 2297 // 2298 // It is possible to execute some methods against arrays, because 2299 // all arrays are subclasses of java_lang_Object_, so we need to set 2300 // up a vtable. We can just point at the one in java_lang_Object_. 2301 // 2302 // Array classes are simple enough that we don't need to do a full 2303 // link step. 2304 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2305 if (UNLIKELY(!init_done_)) { 2306 // Classes that were hand created, ie not by FindSystemClass 2307 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2308 new_class.Assign(GetClassRoot(kClassArrayClass)); 2309 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2310 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2311 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 2312 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2313 } else if (strcmp(descriptor, 2314 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 2315 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2316 } else if (strcmp(descriptor, 2317 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 2318 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2319 } else if (strcmp(descriptor, "[C") == 0) { 2320 new_class.Assign(GetClassRoot(kCharArrayClass)); 2321 } else if (strcmp(descriptor, "[I") == 0) { 2322 new_class.Assign(GetClassRoot(kIntArrayClass)); 2323 } 2324 } 2325 if (new_class.Get() == nullptr) { 2326 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2327 if (new_class.Get() == nullptr) { 2328 return nullptr; 2329 } 2330 new_class->SetComponentType(component_type.Get()); 2331 } 2332 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2333 DCHECK(new_class->GetComponentType() != nullptr); 2334 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2335 new_class->SetSuperClass(java_lang_Object); 2336 new_class->SetVTable(java_lang_Object->GetVTable()); 2337 new_class->SetPrimitiveType(Primitive::kPrimNot); 2338 new_class->SetClassLoader(component_type->GetClassLoader()); 2339 mirror::Class::SetStatus(new_class, mirror::Class::kStatusLoaded, self); 2340 { 2341 StackHandleScope<mirror::Class::kImtSize> hs2(self, 2342 Runtime::Current()->GetImtUnimplementedMethod()); 2343 new_class->PopulateEmbeddedImtAndVTable(&hs2); 2344 } 2345 mirror::Class::SetStatus(new_class, mirror::Class::kStatusInitialized, self); 2346 // don't need to set new_class->SetObjectSize(..) 2347 // because Object::SizeOf delegates to Array::SizeOf 2348 2349 2350 // All arrays have java/lang/Cloneable and java/io/Serializable as 2351 // interfaces. We need to set that up here, so that stuff like 2352 // "instanceof" works right. 2353 // 2354 // Note: The GC could run during the call to FindSystemClass, 2355 // so we need to make sure the class object is GC-valid while we're in 2356 // there. Do this by clearing the interface list so the GC will just 2357 // think that the entries are null. 2358 2359 2360 // Use the single, global copies of "interfaces" and "iftable" 2361 // (remember not to free them for arrays). 2362 { 2363 mirror::IfTable* array_iftable = array_iftable_.Read(); 2364 CHECK(array_iftable != nullptr); 2365 new_class->SetIfTable(array_iftable); 2366 } 2367 2368 // Inherit access flags from the component type. 2369 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2370 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2371 access_flags &= kAccJavaFlagsMask; 2372 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2373 // and remove "interface". 2374 access_flags |= kAccAbstract | kAccFinal; 2375 access_flags &= ~kAccInterface; 2376 2377 new_class->SetAccessFlags(access_flags); 2378 2379 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 2380 if (existing == nullptr) { 2381 return new_class.Get(); 2382 } 2383 // Another thread must have loaded the class after we 2384 // started but before we finished. Abandon what we've 2385 // done. 2386 // 2387 // (Yes, this happens.) 2388 2389 return existing; 2390} 2391 2392mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2393 switch (type) { 2394 case 'B': 2395 return GetClassRoot(kPrimitiveByte); 2396 case 'C': 2397 return GetClassRoot(kPrimitiveChar); 2398 case 'D': 2399 return GetClassRoot(kPrimitiveDouble); 2400 case 'F': 2401 return GetClassRoot(kPrimitiveFloat); 2402 case 'I': 2403 return GetClassRoot(kPrimitiveInt); 2404 case 'J': 2405 return GetClassRoot(kPrimitiveLong); 2406 case 'S': 2407 return GetClassRoot(kPrimitiveShort); 2408 case 'Z': 2409 return GetClassRoot(kPrimitiveBoolean); 2410 case 'V': 2411 return GetClassRoot(kPrimitiveVoid); 2412 default: 2413 break; 2414 } 2415 std::string printable_type(PrintableChar(type)); 2416 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2417 return nullptr; 2418} 2419 2420mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2421 size_t hash) { 2422 if (VLOG_IS_ON(class_linker)) { 2423 mirror::DexCache* dex_cache = klass->GetDexCache(); 2424 std::string source; 2425 if (dex_cache != nullptr) { 2426 source += " from "; 2427 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2428 } 2429 LOG(INFO) << "Loaded class " << descriptor << source; 2430 } 2431 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2432 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2433 if (existing != nullptr) { 2434 return existing; 2435 } 2436 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 2437 dex_cache_image_class_lookup_required_) { 2438 // Check a class loaded with the system class loader matches one in the image if the class 2439 // is in the image. 2440 existing = LookupClassFromImage(descriptor); 2441 if (existing != nullptr) { 2442 CHECK_EQ(klass, existing); 2443 } 2444 } 2445 VerifyObject(klass); 2446 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 2447 if (log_new_class_table_roots_) { 2448 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 2449 } 2450 return nullptr; 2451} 2452 2453mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2454 size_t hash) { 2455 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2456 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 2457 hash); 2458 if (existing_it == class_table_.end()) { 2459 CHECK(klass->IsProxyClass()); 2460 return nullptr; 2461 } 2462 2463 mirror::Class* existing = existing_it->Read(); 2464 CHECK_NE(existing, klass) << descriptor; 2465 CHECK(!existing->IsResolved()) << descriptor; 2466 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2467 2468 CHECK(!klass->IsTemp()) << descriptor; 2469 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2470 dex_cache_image_class_lookup_required_) { 2471 // Check a class loaded with the system class loader matches one in the image if the class 2472 // is in the image. 2473 existing = LookupClassFromImage(descriptor); 2474 if (existing != nullptr) { 2475 CHECK_EQ(klass, existing) << descriptor; 2476 } 2477 } 2478 VerifyObject(klass); 2479 2480 // Update the element in the hash set. 2481 *existing_it = GcRoot<mirror::Class>(klass); 2482 if (log_new_class_table_roots_) { 2483 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 2484 } 2485 2486 return existing; 2487} 2488 2489bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 2490 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2491 auto pair = std::make_pair(descriptor, class_loader); 2492 auto it = class_table_.Find(pair); 2493 if (it != class_table_.end()) { 2494 class_table_.Erase(it); 2495 return true; 2496 } 2497 it = pre_zygote_class_table_.Find(pair); 2498 if (it != pre_zygote_class_table_.end()) { 2499 pre_zygote_class_table_.Erase(it); 2500 return true; 2501 } 2502 return false; 2503} 2504 2505mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, size_t hash, 2506 mirror::ClassLoader* class_loader) { 2507 { 2508 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 2509 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2510 if (result != nullptr) { 2511 return result; 2512 } 2513 } 2514 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 2515 return nullptr; 2516 } else { 2517 // Lookup failed but need to search dex_caches_. 2518 mirror::Class* result = LookupClassFromImage(descriptor); 2519 if (result != nullptr) { 2520 InsertClass(descriptor, result, hash); 2521 } else { 2522 // Searching the image dex files/caches failed, we don't want to get into this situation 2523 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2524 // classes into the class table. 2525 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 2526 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2527 MoveImageClassesToClassTable(); 2528 } 2529 } 2530 return result; 2531 } 2532} 2533 2534mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2535 mirror::ClassLoader* class_loader, 2536 size_t hash) { 2537 auto descriptor_pair = std::make_pair(descriptor, class_loader); 2538 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 2539 if (it == pre_zygote_class_table_.end()) { 2540 it = class_table_.FindWithHash(descriptor_pair, hash); 2541 if (it == class_table_.end()) { 2542 return nullptr; 2543 } 2544 } 2545 return it->Read(); 2546} 2547 2548static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2549 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2550 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2551 CHECK(image != nullptr); 2552 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2553 return root->AsObjectArray<mirror::DexCache>(); 2554} 2555 2556void ClassLinker::MoveImageClassesToClassTable() { 2557 Thread* self = Thread::Current(); 2558 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2559 if (!dex_cache_image_class_lookup_required_) { 2560 return; // All dex cache classes are already in the class table. 2561 } 2562 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 2563 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2564 std::string temp; 2565 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2566 mirror::DexCache* dex_cache = dex_caches->Get(i); 2567 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2568 for (int32_t j = 0; j < types->GetLength(); j++) { 2569 mirror::Class* klass = types->Get(j); 2570 if (klass != nullptr) { 2571 DCHECK(klass->GetClassLoader() == nullptr); 2572 const char* descriptor = klass->GetDescriptor(&temp); 2573 size_t hash = ComputeModifiedUtf8Hash(descriptor); 2574 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 2575 if (existing != nullptr) { 2576 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 2577 << PrettyClassAndClassLoader(klass); 2578 } else { 2579 class_table_.Insert(GcRoot<mirror::Class>(klass)); 2580 if (log_new_class_table_roots_) { 2581 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 2582 } 2583 } 2584 } 2585 } 2586 } 2587 dex_cache_image_class_lookup_required_ = false; 2588} 2589 2590void ClassLinker::MoveClassTableToPreZygote() { 2591 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2592 DCHECK(pre_zygote_class_table_.Empty()); 2593 pre_zygote_class_table_ = std::move(class_table_); 2594 class_table_.Clear(); 2595} 2596 2597mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2598 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 2599 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2600 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2601 mirror::DexCache* dex_cache = dex_caches->Get(i); 2602 const DexFile* dex_file = dex_cache->GetDexFile(); 2603 // Try binary searching the string/type index. 2604 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2605 if (string_id != nullptr) { 2606 const DexFile::TypeId* type_id = 2607 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2608 if (type_id != nullptr) { 2609 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2610 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2611 if (klass != nullptr) { 2612 return klass; 2613 } 2614 } 2615 } 2616 } 2617 return nullptr; 2618} 2619 2620void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2621 result.clear(); 2622 if (dex_cache_image_class_lookup_required_) { 2623 MoveImageClassesToClassTable(); 2624 } 2625 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2626 while (true) { 2627 auto it = class_table_.Find(descriptor); 2628 if (it == class_table_.end()) { 2629 break; 2630 } 2631 result.push_back(it->Read()); 2632 class_table_.Erase(it); 2633 } 2634 for (mirror::Class* k : result) { 2635 class_table_.Insert(GcRoot<mirror::Class>(k)); 2636 } 2637 size_t pre_zygote_start = result.size(); 2638 // Now handle the pre zygote table. 2639 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 2640 // called from the debugger. 2641 while (true) { 2642 auto it = pre_zygote_class_table_.Find(descriptor); 2643 if (it == pre_zygote_class_table_.end()) { 2644 break; 2645 } 2646 result.push_back(it->Read()); 2647 pre_zygote_class_table_.Erase(it); 2648 } 2649 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 2650 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 2651 } 2652} 2653 2654void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 2655 // TODO: assert that the monitor on the Class is held 2656 ObjectLock<mirror::Class> lock(self, klass); 2657 2658 // Don't attempt to re-verify if already sufficiently verified. 2659 if (klass->IsVerified()) { 2660 EnsurePreverifiedMethods(klass); 2661 return; 2662 } 2663 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsAotCompiler()) { 2664 return; 2665 } 2666 2667 // The class might already be erroneous, for example at compile time if we attempted to verify 2668 // this class as a parent to another. 2669 if (klass->IsErroneous()) { 2670 ThrowEarlierClassFailure(klass.Get()); 2671 return; 2672 } 2673 2674 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2675 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerifying, self); 2676 } else { 2677 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2678 << PrettyClass(klass.Get()); 2679 CHECK(!Runtime::Current()->IsAotCompiler()); 2680 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerifyingAtRuntime, self); 2681 } 2682 2683 // Skip verification if disabled. 2684 if (!Runtime::Current()->IsVerificationEnabled()) { 2685 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self); 2686 EnsurePreverifiedMethods(klass); 2687 return; 2688 } 2689 2690 // Verify super class. 2691 StackHandleScope<2> hs(self); 2692 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2693 if (super.Get() != nullptr) { 2694 // Acquire lock to prevent races on verifying the super class. 2695 ObjectLock<mirror::Class> super_lock(self, super); 2696 2697 if (!super->IsVerified() && !super->IsErroneous()) { 2698 VerifyClass(self, super); 2699 } 2700 if (!super->IsCompileTimeVerified()) { 2701 std::string error_msg( 2702 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2703 PrettyDescriptor(klass.Get()).c_str(), 2704 PrettyDescriptor(super.Get()).c_str())); 2705 LOG(WARNING) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2706 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException())); 2707 if (cause.Get() != nullptr) { 2708 self->ClearException(); 2709 } 2710 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2711 if (cause.Get() != nullptr) { 2712 self->GetException()->SetCause(cause.Get()); 2713 } 2714 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2715 if (Runtime::Current()->IsAotCompiler()) { 2716 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2717 } 2718 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 2719 return; 2720 } 2721 } 2722 2723 // Try to use verification information from the oat file, otherwise do runtime verification. 2724 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2725 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2726 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2727 if (oat_file_class_status == mirror::Class::kStatusError) { 2728 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2729 << PrettyDescriptor(klass.Get()) << " in " 2730 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2731 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2732 PrettyDescriptor(klass.Get()).c_str()); 2733 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 2734 return; 2735 } 2736 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2737 std::string error_msg; 2738 if (!preverified) { 2739 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 2740 Runtime::Current()->IsAotCompiler(), 2741 &error_msg); 2742 } 2743 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2744 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2745 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2746 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2747 << " because: " << error_msg; 2748 } 2749 self->AssertNoPendingException(); 2750 // Make sure all classes referenced by catch blocks are resolved. 2751 ResolveClassExceptionHandlerTypes(dex_file, klass); 2752 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2753 // Even though there were no verifier failures we need to respect whether the super-class 2754 // was verified or requiring runtime reverification. 2755 if (super.Get() == nullptr || super->IsVerified()) { 2756 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self); 2757 } else { 2758 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2759 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetryVerificationAtRuntime, self); 2760 // Pretend a soft failure occured so that we don't consider the class verified below. 2761 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2762 } 2763 } else { 2764 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2765 // Soft failures at compile time should be retried at runtime. Soft 2766 // failures at runtime will be handled by slow paths in the generated 2767 // code. Set status accordingly. 2768 if (Runtime::Current()->IsAotCompiler()) { 2769 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetryVerificationAtRuntime, self); 2770 } else { 2771 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self); 2772 // As this is a fake verified status, make sure the methods are _not_ marked preverified 2773 // later. 2774 klass->SetPreverified(); 2775 } 2776 } 2777 } else { 2778 LOG(WARNING) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2779 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2780 << " because: " << error_msg; 2781 self->AssertNoPendingException(); 2782 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2783 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 2784 } 2785 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2786 // Class is verified so we don't need to do any access check on its methods. 2787 // Let the interpreter know it by setting the kAccPreverified flag onto each 2788 // method. 2789 // Note: we're going here during compilation and at runtime. When we set the 2790 // kAccPreverified flag when compiling image classes, the flag is recorded 2791 // in the image and is set when loading the image. 2792 EnsurePreverifiedMethods(klass); 2793 } 2794} 2795 2796void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 2797 if (!klass->IsPreverified()) { 2798 klass->SetPreverifiedFlagOnAllMethods(); 2799 klass->SetPreverified(); 2800 } 2801} 2802 2803bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2804 mirror::Class::Status& oat_file_class_status) { 2805 // If we're compiling, we can only verify the class using the oat file if 2806 // we are not compiling the image or if the class we're verifying is not part of 2807 // the app. In other words, we will only check for preverification of bootclasspath 2808 // classes. 2809 if (Runtime::Current()->IsAotCompiler()) { 2810 // Are we compiling the bootclasspath? 2811 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2812 return false; 2813 } 2814 // We are compiling an app (not the image). 2815 2816 // Is this an app class? (I.e. not a bootclasspath class) 2817 if (klass->GetClassLoader() != nullptr) { 2818 return false; 2819 } 2820 } 2821 2822 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2823 // In case we run without an image there won't be a backing oat file. 2824 if (oat_dex_file == nullptr) { 2825 return false; 2826 } 2827 2828 // We may be running with a preopted oat file but without image. In this case, 2829 // we don't skip verification of preverified classes to ensure we initialize 2830 // dex caches with all types resolved during verification. 2831 // We need to trust image classes, as these might be coming out of a pre-opted, quickened boot 2832 // image (that we just failed loading), and the verifier can't be run on quickened opcodes when 2833 // the runtime isn't started. On the other hand, app classes can be re-verified even if they are 2834 // already pre-opted, as then the runtime is started. 2835 if (!Runtime::Current()->IsAotCompiler() && 2836 !Runtime::Current()->GetHeap()->HasImageSpace() && 2837 klass->GetClassLoader() != nullptr) { 2838 return false; 2839 } 2840 2841 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2842 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2843 if (oat_file_class_status == mirror::Class::kStatusVerified || 2844 oat_file_class_status == mirror::Class::kStatusInitialized) { 2845 return true; 2846 } 2847 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2848 // Compile time verification failed with a soft error. Compile time verification can fail 2849 // because we have incomplete type information. Consider the following: 2850 // class ... { 2851 // Foo x; 2852 // .... () { 2853 // if (...) { 2854 // v1 gets assigned a type of resolved class Foo 2855 // } else { 2856 // v1 gets assigned a type of unresolved class Bar 2857 // } 2858 // iput x = v1 2859 // } } 2860 // when we merge v1 following the if-the-else it results in Conflict 2861 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2862 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2863 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2864 // at compile time). 2865 return false; 2866 } 2867 if (oat_file_class_status == mirror::Class::kStatusError) { 2868 // Compile time verification failed with a hard error. This is caused by invalid instructions 2869 // in the class. These errors are unrecoverable. 2870 return false; 2871 } 2872 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2873 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2874 // not loading the class. 2875 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2876 // isn't a problem and this case shouldn't occur 2877 return false; 2878 } 2879 std::string temp; 2880 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2881 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2882 << klass->GetDescriptor(&temp); 2883 UNREACHABLE(); 2884} 2885 2886void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2887 Handle<mirror::Class> klass) { 2888 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2889 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2890 } 2891 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2892 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2893 } 2894} 2895 2896void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2897 mirror::ArtMethod* method) { 2898 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2899 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2900 if (code_item == nullptr) { 2901 return; // native or abstract method 2902 } 2903 if (code_item->tries_size_ == 0) { 2904 return; // nothing to process 2905 } 2906 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2907 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2908 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2909 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2910 CatchHandlerIterator iterator(handlers_ptr); 2911 for (; iterator.HasNext(); iterator.Next()) { 2912 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2913 // unresolved exception types will be ignored by exception delivery 2914 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2915 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2916 if (exception_type == nullptr) { 2917 DCHECK(Thread::Current()->IsExceptionPending()); 2918 Thread::Current()->ClearException(); 2919 } 2920 } 2921 } 2922 handlers_ptr = iterator.EndDataPointer(); 2923 } 2924} 2925 2926static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2927static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2928 Handle<mirror::ArtMethod> prototype); 2929 2930mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2931 jobjectArray interfaces, jobject loader, 2932 jobjectArray methods, jobjectArray throws) { 2933 Thread* self = soa.Self(); 2934 StackHandleScope<8> hs(self); 2935 MutableHandle<mirror::Class> klass(hs.NewHandle( 2936 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 2937 if (klass.Get() == nullptr) { 2938 CHECK(self->IsExceptionPending()); // OOME. 2939 return nullptr; 2940 } 2941 DCHECK(klass->GetClass() != nullptr); 2942 klass->SetObjectSize(sizeof(mirror::Proxy)); 2943 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 2944 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 2945 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2946 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2947 klass->SetName(soa.Decode<mirror::String*>(name)); 2948 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2949 klass->SetDexCache(proxy_class->GetDexCache()); 2950 mirror::Class::SetStatus(klass, mirror::Class::kStatusIdx, self); 2951 2952 // Instance fields are inherited, but we add a couple of static fields... 2953 { 2954 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2955 if (UNLIKELY(sfields == nullptr)) { 2956 CHECK(self->IsExceptionPending()); // OOME. 2957 return nullptr; 2958 } 2959 klass->SetSFields(sfields); 2960 } 2961 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2962 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2963 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2964 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2965 CHECK(self->IsExceptionPending()); // OOME. 2966 return nullptr; 2967 } 2968 klass->SetStaticField(0, interfaces_sfield.Get()); 2969 interfaces_sfield->SetDexFieldIndex(0); 2970 interfaces_sfield->SetDeclaringClass(klass.Get()); 2971 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2972 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2973 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2974 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2975 CHECK(self->IsExceptionPending()); // OOME. 2976 return nullptr; 2977 } 2978 klass->SetStaticField(1, throws_sfield.Get()); 2979 throws_sfield->SetDexFieldIndex(1); 2980 throws_sfield->SetDeclaringClass(klass.Get()); 2981 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2982 2983 // Proxies have 1 direct method, the constructor 2984 { 2985 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2986 if (UNLIKELY(directs == nullptr)) { 2987 CHECK(self->IsExceptionPending()); // OOME. 2988 return nullptr; 2989 } 2990 klass->SetDirectMethods(directs); 2991 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2992 if (UNLIKELY(constructor == nullptr)) { 2993 CHECK(self->IsExceptionPending()); // OOME. 2994 return nullptr; 2995 } 2996 klass->SetDirectMethod(0, constructor); 2997 } 2998 2999 // Create virtual method using specified prototypes. 3000 size_t num_virtual_methods = 3001 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3002 { 3003 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3004 num_virtual_methods); 3005 if (UNLIKELY(virtuals == nullptr)) { 3006 CHECK(self->IsExceptionPending()); // OOME. 3007 return nullptr; 3008 } 3009 klass->SetVirtualMethods(virtuals); 3010 } 3011 for (size_t i = 0; i < num_virtual_methods; ++i) { 3012 StackHandleScope<1> hs2(self); 3013 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3014 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3015 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3016 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3017 if (UNLIKELY(clone == nullptr)) { 3018 CHECK(self->IsExceptionPending()); // OOME. 3019 return nullptr; 3020 } 3021 klass->SetVirtualMethod(i, clone); 3022 } 3023 3024 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3025 mirror::Class::SetStatus(klass, mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3026 self->AssertNoPendingException(); 3027 3028 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3029 mirror::Class* new_class = nullptr; 3030 { 3031 // Must hold lock on object when resolved. 3032 ObjectLock<mirror::Class> resolution_lock(self, klass); 3033 // Link the fields and virtual methods, creating vtable and iftables 3034 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3035 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3036 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3037 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3038 return nullptr; 3039 } 3040 } 3041 3042 CHECK(klass->IsRetired()); 3043 CHECK_NE(klass.Get(), new_class); 3044 klass.Assign(new_class); 3045 3046 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3047 interfaces_sfield->SetObject<false>(klass.Get(), 3048 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3049 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3050 throws_sfield->SetObject<false>(klass.Get(), 3051 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3052 3053 { 3054 // Lock on klass is released. Lock new class object. 3055 ObjectLock<mirror::Class> initialization_lock(self, klass); 3056 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitialized, self); 3057 } 3058 3059 // sanity checks 3060 if (kIsDebugBuild) { 3061 CHECK(klass->GetIFields() == nullptr); 3062 CheckProxyConstructor(klass->GetDirectMethod(0)); 3063 for (size_t i = 0; i < num_virtual_methods; ++i) { 3064 StackHandleScope<2> hs2(self); 3065 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3066 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3067 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3068 Handle<mirror::ArtMethod> virtual_method(hs2.NewHandle(klass->GetVirtualMethod(i))); 3069 CheckProxyMethod(virtual_method, prototype); 3070 } 3071 3072 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3073 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3074 decoded_name->ToModifiedUtf8().c_str())); 3075 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3076 3077 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3078 decoded_name->ToModifiedUtf8().c_str())); 3079 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3080 3081 CHECK_EQ(klass.Get()->GetInterfaces(), 3082 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3083 CHECK_EQ(klass.Get()->GetThrows(), 3084 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3085 } 3086 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3087 ComputeModifiedUtf8Hash(descriptor.c_str())); 3088 CHECK(existing == nullptr); 3089 return klass.Get(); 3090} 3091 3092std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3093 DCHECK(proxy_class->IsProxyClass()); 3094 mirror::String* name = proxy_class->GetName(); 3095 DCHECK(name != nullptr); 3096 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3097} 3098 3099mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3100 mirror::ArtMethod* proxy_method) { 3101 DCHECK(proxy_class->IsProxyClass()); 3102 DCHECK(proxy_method->IsProxyMethod()); 3103 // Locate the dex cache of the original interface/Object 3104 mirror::DexCache* dex_cache = nullptr; 3105 { 3106 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3107 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3108 mirror::DexCache* a_dex_cache = GetDexCache(i); 3109 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3110 dex_cache = a_dex_cache; 3111 break; 3112 } 3113 } 3114 } 3115 CHECK(dex_cache != nullptr); 3116 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3117 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3118 CHECK(resolved_method != nullptr); 3119 return resolved_method; 3120} 3121 3122 3123mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3124 Handle<mirror::Class> klass, 3125 mirror::Class* proxy_class) { 3126 // Create constructor for Proxy that must initialize h 3127 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3128 proxy_class->GetDirectMethods(); 3129 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3130 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3131 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3132 // constructor method. 3133 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3134 proxy_constructor); 3135 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3136 // code_ too) 3137 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3138 if (constructor == nullptr) { 3139 CHECK(self->IsExceptionPending()); // OOME. 3140 return nullptr; 3141 } 3142 // Make this constructor public and fix the class to be our Proxy version 3143 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3144 constructor->SetDeclaringClass(klass.Get()); 3145 return constructor; 3146} 3147 3148static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3149 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3150 CHECK(constructor->IsConstructor()); 3151 CHECK_STREQ(constructor->GetName(), "<init>"); 3152 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3153 "(Ljava/lang/reflect/InvocationHandler;)V"); 3154 DCHECK(constructor->IsPublic()); 3155} 3156 3157mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3158 Handle<mirror::Class> klass, 3159 Handle<mirror::ArtMethod> prototype) { 3160 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3161 // prototype method 3162 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3163 prototype.Get()); 3164 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3165 // as necessary 3166 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3167 if (UNLIKELY(method == nullptr)) { 3168 CHECK(self->IsExceptionPending()); // OOME. 3169 return nullptr; 3170 } 3171 3172 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3173 // the intersection of throw exceptions as defined in Proxy 3174 method->SetDeclaringClass(klass.Get()); 3175 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3176 3177 // At runtime the method looks like a reference and argument saving method, clone the code 3178 // related parameters from this method. 3179 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3180 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3181 3182 return method; 3183} 3184 3185static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3186 Handle<mirror::ArtMethod> prototype) 3187 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3188 // Basic sanity 3189 CHECK(!prototype->IsFinal()); 3190 CHECK(method->IsFinal()); 3191 CHECK(!method->IsAbstract()); 3192 3193 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3194 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3195 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3196 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3197 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3198 3199 CHECK_STREQ(method->GetName(), prototype->GetName()); 3200 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3201 // More complex sanity - via dex cache 3202 CHECK_EQ(method->GetInterfaceMethodIfProxy()->GetReturnType(), prototype->GetReturnType()); 3203} 3204 3205static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3206 bool can_init_parents) 3207 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3208 if (can_init_statics && can_init_parents) { 3209 return true; 3210 } 3211 if (!can_init_statics) { 3212 // Check if there's a class initializer. 3213 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3214 if (clinit != nullptr) { 3215 return false; 3216 } 3217 // Check if there are encoded static values needing initialization. 3218 if (klass->NumStaticFields() != 0) { 3219 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3220 DCHECK(dex_class_def != nullptr); 3221 if (dex_class_def->static_values_off_ != 0) { 3222 return false; 3223 } 3224 } 3225 } 3226 if (!klass->IsInterface() && klass->HasSuperClass()) { 3227 mirror::Class* super_class = klass->GetSuperClass(); 3228 if (!can_init_parents && !super_class->IsInitialized()) { 3229 return false; 3230 } else { 3231 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3232 return false; 3233 } 3234 } 3235 } 3236 return true; 3237} 3238 3239bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 3240 bool can_init_statics, bool can_init_parents) { 3241 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3242 3243 // Are we already initialized and therefore done? 3244 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3245 // an initialized class will never change its state. 3246 if (klass->IsInitialized()) { 3247 return true; 3248 } 3249 3250 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3251 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3252 return false; 3253 } 3254 3255 self->AllowThreadSuspension(); 3256 uint64_t t0; 3257 { 3258 ObjectLock<mirror::Class> lock(self, klass); 3259 3260 // Re-check under the lock in case another thread initialized ahead of us. 3261 if (klass->IsInitialized()) { 3262 return true; 3263 } 3264 3265 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3266 if (klass->IsErroneous()) { 3267 ThrowEarlierClassFailure(klass.Get()); 3268 VlogClassInitializationFailure(klass); 3269 return false; 3270 } 3271 3272 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3273 3274 if (!klass->IsVerified()) { 3275 VerifyClass(self, klass); 3276 if (!klass->IsVerified()) { 3277 // We failed to verify, expect either the klass to be erroneous or verification failed at 3278 // compile time. 3279 if (klass->IsErroneous()) { 3280 CHECK(self->IsExceptionPending()); 3281 VlogClassInitializationFailure(klass); 3282 } else { 3283 CHECK(Runtime::Current()->IsAotCompiler()); 3284 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3285 } 3286 return false; 3287 } else { 3288 self->AssertNoPendingException(); 3289 } 3290 } 3291 3292 // If the class is kStatusInitializing, either this thread is 3293 // initializing higher up the stack or another thread has beat us 3294 // to initializing and we need to wait. Either way, this 3295 // invocation of InitializeClass will not be responsible for 3296 // running <clinit> and will return. 3297 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3298 // Could have got an exception during verification. 3299 if (self->IsExceptionPending()) { 3300 VlogClassInitializationFailure(klass); 3301 return false; 3302 } 3303 // We caught somebody else in the act; was it us? 3304 if (klass->GetClinitThreadId() == self->GetTid()) { 3305 // Yes. That's fine. Return so we can continue initializing. 3306 return true; 3307 } 3308 // No. That's fine. Wait for another thread to finish initializing. 3309 return WaitForInitializeClass(klass, self, lock); 3310 } 3311 3312 if (!ValidateSuperClassDescriptors(klass)) { 3313 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3314 return false; 3315 } 3316 self->AllowThreadSuspension(); 3317 3318 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3319 3320 // From here out other threads may observe that we're initializing and so changes of state 3321 // require the a notification. 3322 klass->SetClinitThreadId(self->GetTid()); 3323 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitializing, self); 3324 3325 t0 = NanoTime(); 3326 } 3327 3328 // Initialize super classes, must be done while initializing for the JLS. 3329 if (!klass->IsInterface() && klass->HasSuperClass()) { 3330 mirror::Class* super_class = klass->GetSuperClass(); 3331 if (!super_class->IsInitialized()) { 3332 CHECK(!super_class->IsInterface()); 3333 CHECK(can_init_parents); 3334 StackHandleScope<1> hs(self); 3335 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3336 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 3337 if (!super_initialized) { 3338 // The super class was verified ahead of entering initializing, we should only be here if 3339 // the super class became erroneous due to initialization. 3340 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3341 << "Super class initialization failed for " 3342 << PrettyDescriptor(handle_scope_super.Get()) 3343 << " that has unexpected status " << handle_scope_super->GetStatus() 3344 << "\nPending exception:\n" 3345 << (self->GetException() != nullptr ? self->GetException()->Dump() : ""); 3346 ObjectLock<mirror::Class> lock(self, klass); 3347 // Initialization failed because the super-class is erroneous. 3348 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3349 return false; 3350 } 3351 } 3352 } 3353 3354 const size_t num_static_fields = klass->NumStaticFields(); 3355 if (num_static_fields > 0) { 3356 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3357 CHECK(dex_class_def != nullptr); 3358 const DexFile& dex_file = klass->GetDexFile(); 3359 StackHandleScope<3> hs(self); 3360 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3361 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3362 3363 // Eagerly fill in static fields so that the we don't have to do as many expensive 3364 // Class::FindStaticField in ResolveField. 3365 for (size_t i = 0; i < num_static_fields; ++i) { 3366 mirror::ArtField* field = klass->GetStaticField(i); 3367 const uint32_t field_idx = field->GetDexFieldIndex(); 3368 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 3369 if (resolved_field == nullptr) { 3370 dex_cache->SetResolvedField(field_idx, field); 3371 } else { 3372 DCHECK_EQ(field, resolved_field); 3373 } 3374 } 3375 3376 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 3377 this, *dex_class_def); 3378 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 3379 ClassDataItemIterator field_it(dex_file, class_data); 3380 if (value_it.HasNext()) { 3381 DCHECK(field_it.HasNextStaticField()); 3382 CHECK(can_init_statics); 3383 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 3384 StackHandleScope<1> hs2(self); 3385 Handle<mirror::ArtField> field(hs2.NewHandle( 3386 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 3387 if (Runtime::Current()->IsActiveTransaction()) { 3388 value_it.ReadValueToField<true>(field); 3389 } else { 3390 value_it.ReadValueToField<false>(field); 3391 } 3392 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 3393 } 3394 } 3395 } 3396 3397 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3398 if (clinit != nullptr) { 3399 CHECK(can_init_statics); 3400 JValue result; 3401 clinit->Invoke(self, nullptr, 0, &result, "V"); 3402 } 3403 3404 self->AllowThreadSuspension(); 3405 uint64_t t1 = NanoTime(); 3406 3407 bool success = true; 3408 { 3409 ObjectLock<mirror::Class> lock(self, klass); 3410 3411 if (self->IsExceptionPending()) { 3412 WrapExceptionInInitializer(klass); 3413 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3414 success = false; 3415 } else if (Runtime::Current()->IsTransactionAborted()) { 3416 // The exception thrown when the transaction aborted has been caught and cleared 3417 // so we need to throw it again now. 3418 VLOG(compiler) << "Return from class initializer of " << PrettyDescriptor(klass.Get()) 3419 << " without exception while transaction was aborted: re-throw it now."; 3420 Runtime::Current()->ThrowInternalErrorForAbortedTransaction(self); 3421 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3422 success = false; 3423 } else { 3424 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3425 RuntimeStats* thread_stats = self->GetStats(); 3426 ++global_stats->class_init_count; 3427 ++thread_stats->class_init_count; 3428 global_stats->class_init_time_ns += (t1 - t0); 3429 thread_stats->class_init_time_ns += (t1 - t0); 3430 // Set the class as initialized except if failed to initialize static fields. 3431 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitialized, self); 3432 if (VLOG_IS_ON(class_linker)) { 3433 std::string temp; 3434 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3435 klass->GetLocation(); 3436 } 3437 // Opportunistically set static method trampolines to their destination. 3438 FixupStaticTrampolines(klass.Get()); 3439 } 3440 } 3441 return success; 3442} 3443 3444bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3445 ObjectLock<mirror::Class>& lock) 3446 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3447 while (true) { 3448 self->AssertNoPendingException(); 3449 CHECK(!klass->IsInitialized()); 3450 lock.WaitIgnoringInterrupts(); 3451 3452 // When we wake up, repeat the test for init-in-progress. If 3453 // there's an exception pending (only possible if 3454 // we were not using WaitIgnoringInterrupts), bail out. 3455 if (self->IsExceptionPending()) { 3456 WrapExceptionInInitializer(klass); 3457 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3458 return false; 3459 } 3460 // Spurious wakeup? Go back to waiting. 3461 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3462 continue; 3463 } 3464 if (klass->GetStatus() == mirror::Class::kStatusVerified && 3465 Runtime::Current()->IsAotCompiler()) { 3466 // Compile time initialization failed. 3467 return false; 3468 } 3469 if (klass->IsErroneous()) { 3470 // The caller wants an exception, but it was thrown in a 3471 // different thread. Synthesize one here. 3472 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3473 PrettyDescriptor(klass.Get()).c_str()); 3474 VlogClassInitializationFailure(klass); 3475 return false; 3476 } 3477 if (klass->IsInitialized()) { 3478 return true; 3479 } 3480 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3481 << klass->GetStatus(); 3482 } 3483 UNREACHABLE(); 3484} 3485 3486static bool HasSameSignatureWithDifferentClassLoaders(Thread* self, 3487 Handle<mirror::ArtMethod> method1, 3488 Handle<mirror::ArtMethod> method2, 3489 std::string* error_msg) 3490 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3491 { 3492 StackHandleScope<1> hs(self); 3493 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType())); 3494 mirror::Class* other_return_type = method2->GetReturnType(); 3495 // NOTE: return_type.Get() must be sequenced after method2->GetReturnType(). 3496 if (UNLIKELY(other_return_type != return_type.Get())) { 3497 *error_msg = StringPrintf("Return types mismatch: %s(%p) vs %s(%p)", 3498 PrettyClassAndClassLoader(return_type.Get()).c_str(), 3499 return_type.Get(), 3500 PrettyClassAndClassLoader(other_return_type).c_str(), 3501 other_return_type); 3502 return false; 3503 } 3504 } 3505 const DexFile::TypeList* types1 = method1->GetParameterTypeList(); 3506 const DexFile::TypeList* types2 = method2->GetParameterTypeList(); 3507 if (types1 == nullptr) { 3508 if (types2 != nullptr && types2->Size() != 0) { 3509 *error_msg = StringPrintf("Type list mismatch with %s", 3510 PrettyMethod(method2.Get(), true).c_str()); 3511 return false; 3512 } 3513 return true; 3514 } else if (UNLIKELY(types2 == nullptr)) { 3515 if (types1->Size() != 0) { 3516 *error_msg = StringPrintf("Type list mismatch with %s", 3517 PrettyMethod(method2.Get(), true).c_str()); 3518 return false; 3519 } 3520 return true; 3521 } 3522 uint32_t num_types = types1->Size(); 3523 if (UNLIKELY(num_types != types2->Size())) { 3524 *error_msg = StringPrintf("Type list mismatch with %s", 3525 PrettyMethod(method2.Get(), true).c_str()); 3526 return false; 3527 } 3528 for (uint32_t i = 0; i < num_types; ++i) { 3529 StackHandleScope<1> hs(self); 3530 Handle<mirror::Class> param_type(hs.NewHandle( 3531 method1->GetClassFromTypeIndex(types1->GetTypeItem(i).type_idx_, true))); 3532 mirror::Class* other_param_type = 3533 method2->GetClassFromTypeIndex(types2->GetTypeItem(i).type_idx_, true); 3534 // NOTE: param_type.Get() must be sequenced after method2->GetClassFromTypeIndex(...). 3535 if (UNLIKELY(param_type.Get() != other_param_type)) { 3536 *error_msg = StringPrintf("Parameter %u type mismatch: %s(%p) vs %s(%p)", 3537 i, 3538 PrettyClassAndClassLoader(param_type.Get()).c_str(), 3539 param_type.Get(), 3540 PrettyClassAndClassLoader(other_param_type).c_str(), 3541 other_param_type); 3542 return false; 3543 } 3544 } 3545 return true; 3546} 3547 3548 3549bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3550 if (klass->IsInterface()) { 3551 return true; 3552 } 3553 // Begin with the methods local to the superclass. 3554 Thread* self = Thread::Current(); 3555 StackHandleScope<2> hs(self); 3556 MutableHandle<mirror::ArtMethod> h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3557 MutableHandle<mirror::ArtMethod> super_h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3558 if (klass->HasSuperClass() && 3559 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3560 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3561 h_m.Assign(klass->GetVTableEntry(i)); 3562 super_h_m.Assign(klass->GetSuperClass()->GetVTableEntry(i)); 3563 if (h_m.Get() != super_h_m.Get()) { 3564 std::string error_msg; 3565 if (!HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m, &error_msg)) { 3566 ThrowLinkageError(klass.Get(), 3567 "Class %s method %s resolves differently in superclass %s: %s", 3568 PrettyDescriptor(klass.Get()).c_str(), 3569 PrettyMethod(h_m.Get()).c_str(), 3570 PrettyDescriptor(klass->GetSuperClass()).c_str(), 3571 error_msg.c_str()); 3572 return false; 3573 } 3574 } 3575 } 3576 } 3577 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3578 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3579 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3580 for (uint32_t j = 0; j < num_methods; ++j) { 3581 h_m.Assign(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3582 super_h_m.Assign(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3583 if (h_m.Get() != super_h_m.Get()) { 3584 std::string error_msg; 3585 if (!HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m, &error_msg)) { 3586 ThrowLinkageError(klass.Get(), 3587 "Class %s method %s resolves differently in interface %s: %s", 3588 PrettyDescriptor(klass.Get()).c_str(), 3589 PrettyMethod(h_m.Get()).c_str(), 3590 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str(), 3591 error_msg.c_str()); 3592 return false; 3593 } 3594 } 3595 } 3596 } 3597 } 3598 return true; 3599} 3600 3601bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 3602 bool can_init_parents) { 3603 DCHECK(c.Get() != nullptr); 3604 if (c->IsInitialized()) { 3605 EnsurePreverifiedMethods(c); 3606 return true; 3607 } 3608 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 3609 if (!success) { 3610 if (can_init_fields && can_init_parents) { 3611 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 3612 } 3613 } else { 3614 self->AssertNoPendingException(); 3615 } 3616 return success; 3617} 3618 3619void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3620 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3621 if (fields != nullptr) { 3622 for (int index = 0; index < fields->GetLength(); index ++) { 3623 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3624 fields->Get(index)->SetDeclaringClass(new_class); 3625 } 3626 } 3627 } 3628 3629 fields = new_class->GetSFields(); 3630 if (fields != nullptr) { 3631 for (int index = 0; index < fields->GetLength(); index ++) { 3632 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3633 fields->Get(index)->SetDeclaringClass(new_class); 3634 } 3635 } 3636 } 3637 3638 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3639 if (methods != nullptr) { 3640 for (int index = 0; index < methods->GetLength(); index ++) { 3641 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3642 methods->Get(index)->SetDeclaringClass(new_class); 3643 } 3644 } 3645 } 3646 3647 methods = new_class->GetVirtualMethods(); 3648 if (methods != nullptr) { 3649 for (int index = 0; index < methods->GetLength(); index ++) { 3650 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3651 methods->Get(index)->SetDeclaringClass(new_class); 3652 } 3653 } 3654 } 3655} 3656 3657bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3658 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3659 mirror::Class** new_class) { 3660 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3661 3662 if (!LinkSuperClass(klass)) { 3663 return false; 3664 } 3665 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 3666 self, Runtime::Current()->GetImtUnimplementedMethod()); 3667 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 3668 return false; 3669 } 3670 if (!LinkInstanceFields(self, klass)) { 3671 return false; 3672 } 3673 size_t class_size; 3674 if (!LinkStaticFields(self, klass, &class_size)) { 3675 return false; 3676 } 3677 CreateReferenceInstanceOffsets(klass); 3678 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3679 3680 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3681 // We don't need to retire this class as it has no embedded tables or it was created the 3682 // correct size during class linker initialization. 3683 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3684 3685 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3686 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 3687 } 3688 3689 // This will notify waiters on klass that saw the not yet resolved 3690 // class in the class_table_ during EnsureResolved. 3691 mirror::Class::SetStatus(klass, mirror::Class::kStatusResolved, self); 3692 *new_class = klass.Get(); 3693 } else { 3694 CHECK(!klass->IsResolved()); 3695 // Retire the temporary class and create the correctly sized resolved class. 3696 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 3697 if (UNLIKELY(*new_class == nullptr)) { 3698 CHECK(self->IsExceptionPending()); // Expect an OOME. 3699 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self); 3700 return false; 3701 } 3702 3703 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3704 StackHandleScope<1> hs(self); 3705 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3706 ObjectLock<mirror::Class> lock(self, new_class_h); 3707 3708 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3709 3710 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 3711 ComputeModifiedUtf8Hash(descriptor)); 3712 CHECK(existing == nullptr || existing == klass.Get()); 3713 3714 // This will notify waiters on temp class that saw the not yet resolved class in the 3715 // class_table_ during EnsureResolved. 3716 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetired, self); 3717 3718 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 3719 // This will notify waiters on new_class that saw the not yet resolved 3720 // class in the class_table_ during EnsureResolved. 3721 mirror::Class::SetStatus(new_class_h, mirror::Class::kStatusResolved, self); 3722 } 3723 return true; 3724} 3725 3726static void CountMethodsAndFields(ClassDataItemIterator& dex_data, 3727 size_t* virtual_methods, 3728 size_t* direct_methods, 3729 size_t* static_fields, 3730 size_t* instance_fields) { 3731 *virtual_methods = *direct_methods = *static_fields = *instance_fields = 0; 3732 3733 while (dex_data.HasNextStaticField()) { 3734 dex_data.Next(); 3735 (*static_fields)++; 3736 } 3737 while (dex_data.HasNextInstanceField()) { 3738 dex_data.Next(); 3739 (*instance_fields)++; 3740 } 3741 while (dex_data.HasNextDirectMethod()) { 3742 (*direct_methods)++; 3743 dex_data.Next(); 3744 } 3745 while (dex_data.HasNextVirtualMethod()) { 3746 (*virtual_methods)++; 3747 dex_data.Next(); 3748 } 3749 DCHECK(!dex_data.HasNext()); 3750} 3751 3752static void DumpClass(std::ostream& os, 3753 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3754 const char* suffix) { 3755 ClassDataItemIterator dex_data(dex_file, dex_file.GetClassData(dex_class_def)); 3756 os << dex_file.GetClassDescriptor(dex_class_def) << suffix << ":\n"; 3757 os << " Static fields:\n"; 3758 while (dex_data.HasNextStaticField()) { 3759 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 3760 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 3761 dex_data.Next(); 3762 } 3763 os << " Instance fields:\n"; 3764 while (dex_data.HasNextInstanceField()) { 3765 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 3766 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 3767 dex_data.Next(); 3768 } 3769 os << " Direct methods:\n"; 3770 while (dex_data.HasNextDirectMethod()) { 3771 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 3772 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 3773 dex_data.Next(); 3774 } 3775 os << " Virtual methods:\n"; 3776 while (dex_data.HasNextVirtualMethod()) { 3777 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 3778 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 3779 dex_data.Next(); 3780 } 3781} 3782 3783static std::string DumpClasses(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 3784 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2) { 3785 std::ostringstream os; 3786 DumpClass(os, dex_file1, dex_class_def1, " (Compile time)"); 3787 DumpClass(os, dex_file2, dex_class_def2, " (Runtime)"); 3788 return os.str(); 3789} 3790 3791 3792// Very simple structural check on whether the classes match. Only compares the number of 3793// methods and fields. 3794static bool SimpleStructuralCheck(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 3795 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2, 3796 std::string* error_msg) { 3797 ClassDataItemIterator dex_data1(dex_file1, dex_file1.GetClassData(dex_class_def1)); 3798 ClassDataItemIterator dex_data2(dex_file2, dex_file2.GetClassData(dex_class_def2)); 3799 3800 // Counters for current dex file. 3801 size_t dex_virtual_methods1, dex_direct_methods1, dex_static_fields1, dex_instance_fields1; 3802 CountMethodsAndFields(dex_data1, &dex_virtual_methods1, &dex_direct_methods1, &dex_static_fields1, 3803 &dex_instance_fields1); 3804 // Counters for compile-time dex file. 3805 size_t dex_virtual_methods2, dex_direct_methods2, dex_static_fields2, dex_instance_fields2; 3806 CountMethodsAndFields(dex_data2, &dex_virtual_methods2, &dex_direct_methods2, &dex_static_fields2, 3807 &dex_instance_fields2); 3808 3809 if (dex_virtual_methods1 != dex_virtual_methods2) { 3810 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 3811 *error_msg = StringPrintf("Virtual method count off: %zu vs %zu\n%s", dex_virtual_methods1, 3812 dex_virtual_methods2, class_dump.c_str()); 3813 return false; 3814 } 3815 if (dex_direct_methods1 != dex_direct_methods2) { 3816 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 3817 *error_msg = StringPrintf("Direct method count off: %zu vs %zu\n%s", dex_direct_methods1, 3818 dex_direct_methods2, class_dump.c_str()); 3819 return false; 3820 } 3821 if (dex_static_fields1 != dex_static_fields2) { 3822 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 3823 *error_msg = StringPrintf("Static field count off: %zu vs %zu\n%s", dex_static_fields1, 3824 dex_static_fields2, class_dump.c_str()); 3825 return false; 3826 } 3827 if (dex_instance_fields1 != dex_instance_fields2) { 3828 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 3829 *error_msg = StringPrintf("Instance field count off: %zu vs %zu\n%s", dex_instance_fields1, 3830 dex_instance_fields2, class_dump.c_str()); 3831 return false; 3832 } 3833 3834 return true; 3835} 3836 3837// Checks whether a the super-class changed from what we had at compile-time. This would 3838// invalidate quickening. 3839static bool CheckSuperClassChange(Handle<mirror::Class> klass, 3840 const DexFile& dex_file, 3841 const DexFile::ClassDef& class_def, 3842 mirror::Class* super_class) 3843 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3844 // Check for unexpected changes in the superclass. 3845 // Quick check 1) is the super_class class-loader the boot class loader? This always has 3846 // precedence. 3847 if (super_class->GetClassLoader() != nullptr && 3848 // Quick check 2) different dex cache? Breaks can only occur for different dex files, 3849 // which is implied by different dex cache. 3850 klass->GetDexCache() != super_class->GetDexCache()) { 3851 // Now comes the expensive part: things can be broken if (a) the klass' dex file has a 3852 // definition for the super-class, and (b) the files are in separate oat files. The oat files 3853 // are referenced from the dex file, so do (b) first. Only relevant if we have oat files. 3854 const OatFile* class_oat_file = dex_file.GetOatFile(); 3855 if (class_oat_file != nullptr) { 3856 const OatFile* loaded_super_oat_file = super_class->GetDexFile().GetOatFile(); 3857 if (loaded_super_oat_file != nullptr && class_oat_file != loaded_super_oat_file) { 3858 // Now check (a). 3859 const DexFile::ClassDef* super_class_def = dex_file.FindClassDef(class_def.superclass_idx_); 3860 if (super_class_def != nullptr) { 3861 // Uh-oh, we found something. Do our check. 3862 std::string error_msg; 3863 if (!SimpleStructuralCheck(dex_file, *super_class_def, 3864 super_class->GetDexFile(), *super_class->GetClassDef(), 3865 &error_msg)) { 3866 // Print a warning to the log. This exception might be caught, e.g., as common in test 3867 // drivers. When the class is later tried to be used, we re-throw a new instance, as we 3868 // only save the type of the exception. 3869 LOG(WARNING) << "Incompatible structural change detected: " << 3870 StringPrintf( 3871 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 3872 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 3873 class_oat_file->GetLocation().c_str(), 3874 loaded_super_oat_file->GetLocation().c_str(), 3875 error_msg.c_str()); 3876 ThrowIncompatibleClassChangeError(klass.Get(), 3877 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 3878 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 3879 class_oat_file->GetLocation().c_str(), 3880 loaded_super_oat_file->GetLocation().c_str(), 3881 error_msg.c_str()); 3882 return false; 3883 } 3884 } 3885 } 3886 } 3887 } 3888 return true; 3889} 3890 3891bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3892 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3893 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3894 uint16_t super_class_idx = class_def.superclass_idx_; 3895 if (super_class_idx != DexFile::kDexNoIndex16) { 3896 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3897 if (super_class == nullptr) { 3898 DCHECK(Thread::Current()->IsExceptionPending()); 3899 return false; 3900 } 3901 // Verify 3902 if (!klass->CanAccess(super_class)) { 3903 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3904 PrettyDescriptor(super_class).c_str(), 3905 PrettyDescriptor(klass.Get()).c_str()); 3906 return false; 3907 } 3908 CHECK(super_class->IsResolved()); 3909 klass->SetSuperClass(super_class); 3910 3911 if (!CheckSuperClassChange(klass, dex_file, class_def, super_class)) { 3912 DCHECK(Thread::Current()->IsExceptionPending()); 3913 return false; 3914 } 3915 } 3916 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3917 if (interfaces != nullptr) { 3918 for (size_t i = 0; i < interfaces->Size(); i++) { 3919 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3920 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3921 if (interface == nullptr) { 3922 DCHECK(Thread::Current()->IsExceptionPending()); 3923 return false; 3924 } 3925 // Verify 3926 if (!klass->CanAccess(interface)) { 3927 // TODO: the RI seemed to ignore this in my testing. 3928 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3929 PrettyDescriptor(interface).c_str(), 3930 PrettyDescriptor(klass.Get()).c_str()); 3931 return false; 3932 } 3933 } 3934 } 3935 // Mark the class as loaded. 3936 mirror::Class::SetStatus(klass, mirror::Class::kStatusLoaded, nullptr); 3937 return true; 3938} 3939 3940bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3941 CHECK(!klass->IsPrimitive()); 3942 mirror::Class* super = klass->GetSuperClass(); 3943 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3944 if (super != nullptr) { 3945 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3946 return false; 3947 } 3948 return true; 3949 } 3950 if (super == nullptr) { 3951 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3952 PrettyDescriptor(klass.Get()).c_str()); 3953 return false; 3954 } 3955 // Verify 3956 if (super->IsFinal() || super->IsInterface()) { 3957 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3958 PrettyDescriptor(super).c_str(), 3959 PrettyDescriptor(klass.Get()).c_str(), 3960 super->IsFinal() ? "declared final" : "an interface"); 3961 return false; 3962 } 3963 if (!klass->CanAccess(super)) { 3964 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3965 PrettyDescriptor(super).c_str(), 3966 PrettyDescriptor(klass.Get()).c_str()); 3967 return false; 3968 } 3969 3970 // Inherit kAccClassIsFinalizable from the superclass in case this 3971 // class doesn't override finalize. 3972 if (super->IsFinalizable()) { 3973 klass->SetFinalizable(); 3974 } 3975 3976 // Inherit reference flags (if any) from the superclass. 3977 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3978 if (reference_flags != 0) { 3979 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3980 } 3981 // Disallow custom direct subclasses of java.lang.ref.Reference. 3982 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3983 ThrowLinkageError(klass.Get(), 3984 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3985 PrettyDescriptor(klass.Get()).c_str()); 3986 return false; 3987 } 3988 3989 if (kIsDebugBuild) { 3990 // Ensure super classes are fully resolved prior to resolving fields.. 3991 while (super != nullptr) { 3992 CHECK(super->IsResolved()); 3993 super = super->GetSuperClass(); 3994 } 3995 } 3996 return true; 3997} 3998 3999// Populate the class vtable and itable. Compute return type indices. 4000bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4001 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4002 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4003 self->AllowThreadSuspension(); 4004 if (klass->IsInterface()) { 4005 // No vtable. 4006 size_t count = klass->NumVirtualMethods(); 4007 if (!IsUint<16>(count)) { 4008 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4009 return false; 4010 } 4011 for (size_t i = 0; i < count; ++i) { 4012 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4013 } 4014 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4015 return false; 4016 } 4017 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4018} 4019 4020// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4021// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4022// caches in the implementation below. 4023class MethodNameAndSignatureComparator FINAL : public ValueObject { 4024 public: 4025 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4026 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4027 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4028 name_(nullptr), name_len_(0) { 4029 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4030 } 4031 4032 const char* GetName() { 4033 if (name_ == nullptr) { 4034 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4035 } 4036 return name_; 4037 } 4038 4039 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4040 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4041 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4042 const DexFile* other_dex_file = other->GetDexFile(); 4043 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4044 if (dex_file_ == other_dex_file) { 4045 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4046 } 4047 GetName(); // Only used to make sure its calculated. 4048 uint32_t other_name_len; 4049 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4050 &other_name_len); 4051 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4052 return false; 4053 } 4054 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4055 } 4056 4057 private: 4058 // Dex file for the method to compare against. 4059 const DexFile* const dex_file_; 4060 // MethodId for the method to compare against. 4061 const DexFile::MethodId* const mid_; 4062 // Lazily computed name from the dex file's strings. 4063 const char* name_; 4064 // Lazily computed name length. 4065 uint32_t name_len_; 4066}; 4067 4068class LinkVirtualHashTable { 4069 public: 4070 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4071 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4072 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4073 } 4074 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4075 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4076 const char* name = local_method->GetName(); 4077 uint32_t hash = ComputeModifiedUtf8Hash(name); 4078 uint32_t index = hash % hash_size_; 4079 // Linear probe until we have an empty slot. 4080 while (hash_table_[index] != invalid_index_) { 4081 if (++index == hash_size_) { 4082 index = 0; 4083 } 4084 } 4085 hash_table_[index] = virtual_method_index; 4086 } 4087 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4088 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4089 const char* name = comparator->GetName(); 4090 uint32_t hash = ComputeModifiedUtf8Hash(name); 4091 size_t index = hash % hash_size_; 4092 while (true) { 4093 const uint32_t value = hash_table_[index]; 4094 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4095 // the block and can safely assume not found. 4096 if (value == invalid_index_) { 4097 break; 4098 } 4099 if (value != removed_index_) { // This signifies not already overriden. 4100 mirror::ArtMethod* virtual_method = 4101 klass_->GetVirtualMethodDuringLinking(value); 4102 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4103 hash_table_[index] = removed_index_; 4104 return value; 4105 } 4106 } 4107 if (++index == hash_size_) { 4108 index = 0; 4109 } 4110 } 4111 return GetNotFoundIndex(); 4112 } 4113 static uint32_t GetNotFoundIndex() { 4114 return invalid_index_; 4115 } 4116 4117 private: 4118 static const uint32_t invalid_index_; 4119 static const uint32_t removed_index_; 4120 4121 Handle<mirror::Class> klass_; 4122 const size_t hash_size_; 4123 uint32_t* const hash_table_; 4124}; 4125 4126const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4127const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4128 4129bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4130 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4131 if (klass->HasSuperClass()) { 4132 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4133 const size_t max_count = num_virtual_methods + super_vtable_length; 4134 StackHandleScope<2> hs(self); 4135 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4136 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4137 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4138 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4139 if (UNLIKELY(vtable.Get() == nullptr)) { 4140 CHECK(self->IsExceptionPending()); // OOME. 4141 return false; 4142 } 4143 for (size_t i = 0; i < super_vtable_length; i++) { 4144 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4145 } 4146 if (num_virtual_methods == 0) { 4147 klass->SetVTable(vtable.Get()); 4148 return true; 4149 } 4150 } else { 4151 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4152 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4153 if (num_virtual_methods == 0) { 4154 klass->SetVTable(super_vtable); 4155 return true; 4156 } 4157 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4158 if (UNLIKELY(vtable.Get() == nullptr)) { 4159 CHECK(self->IsExceptionPending()); // OOME. 4160 return false; 4161 } 4162 } 4163 // How the algorithm works: 4164 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4165 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4166 // method which has not been matched to a vtable method, and j if the virtual method at the 4167 // index overrode the super virtual method at index j. 4168 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4169 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4170 // the need for the initial vtable which we later shrink back down). 4171 // 3. Add non overridden methods to the end of the vtable. 4172 static constexpr size_t kMaxStackHash = 250; 4173 const size_t hash_table_size = num_virtual_methods * 3; 4174 uint32_t* hash_table_ptr; 4175 std::unique_ptr<uint32_t[]> hash_heap_storage; 4176 if (hash_table_size <= kMaxStackHash) { 4177 hash_table_ptr = reinterpret_cast<uint32_t*>( 4178 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4179 } else { 4180 hash_heap_storage.reset(new uint32_t[hash_table_size]); 4181 hash_table_ptr = hash_heap_storage.get(); 4182 } 4183 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 4184 // Add virtual methods to the hash table. 4185 for (size_t i = 0; i < num_virtual_methods; ++i) { 4186 hash_table.Add(i); 4187 } 4188 // Loop through each super vtable method and see if they are overriden by a method we added to 4189 // the hash table. 4190 for (size_t j = 0; j < super_vtable_length; ++j) { 4191 // Search the hash table to see if we are overidden by any method. 4192 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4193 MethodNameAndSignatureComparator super_method_name_comparator( 4194 super_method->GetInterfaceMethodIfProxy()); 4195 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 4196 if (hash_index != hash_table.GetNotFoundIndex()) { 4197 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 4198 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4199 super_method->GetAccessFlags())) { 4200 if (super_method->IsFinal()) { 4201 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4202 PrettyMethod(virtual_method).c_str(), 4203 super_method->GetDeclaringClassDescriptor()); 4204 return false; 4205 } 4206 vtable->SetWithoutChecks<false>(j, virtual_method); 4207 virtual_method->SetMethodIndex(j); 4208 } else { 4209 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 4210 << " would have incorrectly overridden the package-private method in " 4211 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4212 } 4213 } 4214 } 4215 // Add the non overridden methods at the end. 4216 size_t actual_count = super_vtable_length; 4217 for (size_t i = 0; i < num_virtual_methods; ++i) { 4218 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4219 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 4220 if (method_idx < super_vtable_length && 4221 local_method == vtable->GetWithoutChecks(method_idx)) { 4222 continue; 4223 } 4224 vtable->SetWithoutChecks<false>(actual_count, local_method); 4225 local_method->SetMethodIndex(actual_count); 4226 ++actual_count; 4227 } 4228 if (!IsUint<16>(actual_count)) { 4229 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4230 return false; 4231 } 4232 // Shrink vtable if possible 4233 CHECK_LE(actual_count, max_count); 4234 if (actual_count < max_count) { 4235 vtable.Assign(vtable->CopyOf(self, actual_count)); 4236 if (UNLIKELY(vtable.Get() == nullptr)) { 4237 CHECK(self->IsExceptionPending()); // OOME. 4238 return false; 4239 } 4240 } 4241 klass->SetVTable(vtable.Get()); 4242 } else { 4243 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4244 if (!IsUint<16>(num_virtual_methods)) { 4245 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 4246 static_cast<int>(num_virtual_methods)); 4247 return false; 4248 } 4249 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 4250 if (UNLIKELY(vtable == nullptr)) { 4251 CHECK(self->IsExceptionPending()); // OOME. 4252 return false; 4253 } 4254 for (size_t i = 0; i < num_virtual_methods; ++i) { 4255 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4256 vtable->SetWithoutChecks<false>(i, virtual_method); 4257 virtual_method->SetMethodIndex(i & 0xFFFF); 4258 } 4259 klass->SetVTable(vtable); 4260 } 4261 return true; 4262} 4263 4264bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 4265 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4266 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4267 StackHandleScope<3> hs(self); 4268 Runtime* const runtime = Runtime::Current(); 4269 const bool has_superclass = klass->HasSuperClass(); 4270 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 4271 const bool have_interfaces = interfaces.Get() != nullptr; 4272 const size_t num_interfaces = 4273 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 4274 if (num_interfaces == 0) { 4275 if (super_ifcount == 0) { 4276 // Class implements no interfaces. 4277 DCHECK_EQ(klass->GetIfTableCount(), 0); 4278 DCHECK(klass->GetIfTable() == nullptr); 4279 return true; 4280 } 4281 // Class implements same interfaces as parent, are any of these not marker interfaces? 4282 bool has_non_marker_interface = false; 4283 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4284 for (size_t i = 0; i < super_ifcount; ++i) { 4285 if (super_iftable->GetMethodArrayCount(i) > 0) { 4286 has_non_marker_interface = true; 4287 break; 4288 } 4289 } 4290 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4291 if (!has_non_marker_interface) { 4292 klass->SetIfTable(super_iftable); 4293 return true; 4294 } 4295 } 4296 size_t ifcount = super_ifcount + num_interfaces; 4297 for (size_t i = 0; i < num_interfaces; i++) { 4298 mirror::Class* interface = have_interfaces ? 4299 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 4300 DCHECK(interface != nullptr); 4301 if (UNLIKELY(!interface->IsInterface())) { 4302 std::string temp; 4303 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4304 PrettyDescriptor(klass.Get()).c_str(), 4305 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4306 return false; 4307 } 4308 ifcount += interface->GetIfTableCount(); 4309 } 4310 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4311 if (UNLIKELY(iftable.Get() == nullptr)) { 4312 CHECK(self->IsExceptionPending()); // OOME. 4313 return false; 4314 } 4315 if (super_ifcount != 0) { 4316 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4317 for (size_t i = 0; i < super_ifcount; i++) { 4318 mirror::Class* super_interface = super_iftable->GetInterface(i); 4319 iftable->SetInterface(i, super_interface); 4320 } 4321 } 4322 self->AllowThreadSuspension(); 4323 // Flatten the interface inheritance hierarchy. 4324 size_t idx = super_ifcount; 4325 for (size_t i = 0; i < num_interfaces; i++) { 4326 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 4327 mirror::Class::GetDirectInterface(self, klass, i); 4328 // Check if interface is already in iftable 4329 bool duplicate = false; 4330 for (size_t j = 0; j < idx; j++) { 4331 mirror::Class* existing_interface = iftable->GetInterface(j); 4332 if (existing_interface == interface) { 4333 duplicate = true; 4334 break; 4335 } 4336 } 4337 if (!duplicate) { 4338 // Add this non-duplicate interface. 4339 iftable->SetInterface(idx++, interface); 4340 // Add this interface's non-duplicate super-interfaces. 4341 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4342 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4343 bool super_duplicate = false; 4344 for (size_t k = 0; k < idx; k++) { 4345 mirror::Class* existing_interface = iftable->GetInterface(k); 4346 if (existing_interface == super_interface) { 4347 super_duplicate = true; 4348 break; 4349 } 4350 } 4351 if (!super_duplicate) { 4352 iftable->SetInterface(idx++, super_interface); 4353 } 4354 } 4355 } 4356 } 4357 self->AllowThreadSuspension(); 4358 // Shrink iftable in case duplicates were found 4359 if (idx < ifcount) { 4360 DCHECK_NE(num_interfaces, 0U); 4361 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4362 if (UNLIKELY(iftable.Get() == nullptr)) { 4363 CHECK(self->IsExceptionPending()); // OOME. 4364 return false; 4365 } 4366 ifcount = idx; 4367 } else { 4368 DCHECK_EQ(idx, ifcount); 4369 } 4370 klass->SetIfTable(iftable.Get()); 4371 // If we're an interface, we don't need the vtable pointers, so we're done. 4372 if (klass->IsInterface()) { 4373 return true; 4374 } 4375 size_t miranda_list_size = 0; 4376 size_t max_miranda_methods = 0; // The max size of miranda_list. 4377 for (size_t i = 0; i < ifcount; ++i) { 4378 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4379 } 4380 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 4381 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4382 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4383 hs.NewHandle(klass->GetVTableDuringLinking())); 4384 // Copy the IMT from the super class if possible. 4385 bool extend_super_iftable = false; 4386 if (has_superclass) { 4387 mirror::Class* super_class = klass->GetSuperClass(); 4388 extend_super_iftable = true; 4389 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4390 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 4391 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 4392 } 4393 } else { 4394 // No imt in the super class, need to reconstruct from the iftable. 4395 mirror::IfTable* if_table = super_class->GetIfTable(); 4396 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4397 const size_t length = super_class->GetIfTableCount(); 4398 for (size_t i = 0; i < length; ++i) { 4399 mirror::Class* interface = iftable->GetInterface(i); 4400 const size_t num_virtuals = interface->NumVirtualMethods(); 4401 const size_t method_array_count = if_table->GetMethodArrayCount(i); 4402 DCHECK_EQ(num_virtuals, method_array_count); 4403 if (method_array_count == 0) { 4404 continue; 4405 } 4406 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 4407 for (size_t j = 0; j < num_virtuals; ++j) { 4408 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 4409 if (method->IsMiranda()) { 4410 continue; 4411 } 4412 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 4413 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4414 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4415 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4416 out_imt->SetReference(imt_index, method); 4417 } else if (imt_ref != conflict_method) { 4418 out_imt->SetReference(imt_index, conflict_method); 4419 } 4420 } 4421 } 4422 } 4423 } 4424 for (size_t i = 0; i < ifcount; ++i) { 4425 self->AllowThreadSuspension(); 4426 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4427 if (num_methods > 0) { 4428 StackHandleScope<2> hs2(self); 4429 const bool is_super = i < super_ifcount; 4430 const bool super_interface = is_super && extend_super_iftable; 4431 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 4432 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 4433 if (super_interface) { 4434 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 4435 DCHECK(if_table != nullptr); 4436 DCHECK(if_table->GetMethodArray(i) != nullptr); 4437 // If we are working on a super interface, try extending the existing method array. 4438 method_array = hs2.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 4439 AsObjectArray<mirror::ArtMethod>()); 4440 // We are overwriting a super class interface, try to only virtual methods instead of the 4441 // whole vtable. 4442 input_array = hs2.NewHandle(klass->GetVirtualMethods()); 4443 } else { 4444 method_array = hs2.NewHandle(AllocArtMethodArray(self, num_methods)); 4445 // A new interface, we need the whole vtable incase a new interface method is implemented 4446 // in the whole superclass. 4447 input_array = vtable; 4448 } 4449 if (UNLIKELY(method_array.Get() == nullptr)) { 4450 CHECK(self->IsExceptionPending()); // OOME. 4451 return false; 4452 } 4453 iftable->SetMethodArray(i, method_array.Get()); 4454 if (input_array.Get() == nullptr) { 4455 // If the added virtual methods is empty, do nothing. 4456 DCHECK(super_interface); 4457 continue; 4458 } 4459 for (size_t j = 0; j < num_methods; ++j) { 4460 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4461 MethodNameAndSignatureComparator interface_name_comparator( 4462 interface_method->GetInterfaceMethodIfProxy()); 4463 int32_t k; 4464 // For each method listed in the interface's method list, find the 4465 // matching method in our class's method list. We want to favor the 4466 // subclass over the superclass, which just requires walking 4467 // back from the end of the vtable. (This only matters if the 4468 // superclass defines a private method and this class redefines 4469 // it -- otherwise it would use the same vtable slot. In .dex files 4470 // those don't end up in the virtual method table, so it shouldn't 4471 // matter which direction we go. We walk it backward anyway.) 4472 for (k = input_array->GetLength() - 1; k >= 0; --k) { 4473 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 4474 mirror::ArtMethod* vtable_method_for_name_comparison = 4475 vtable_method->GetInterfaceMethodIfProxy(); 4476 if (interface_name_comparator.HasSameNameAndSignature( 4477 vtable_method_for_name_comparison)) { 4478 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4479 ThrowIllegalAccessError( 4480 klass.Get(), 4481 "Method '%s' implementing interface method '%s' is not public", 4482 PrettyMethod(vtable_method).c_str(), 4483 PrettyMethod(interface_method).c_str()); 4484 return false; 4485 } 4486 method_array->SetWithoutChecks<false>(j, vtable_method); 4487 // Place method in imt if entry is empty, place conflict otherwise. 4488 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4489 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4490 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4491 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4492 out_imt->SetReference(imt_index, vtable_method); 4493 } else if (imt_ref != conflict_method) { 4494 // If we are not a conflict and we have the same signature and name as the imt entry, 4495 // it must be that we overwrote a superclass vtable entry. 4496 MethodNameAndSignatureComparator imt_ref_name_comparator( 4497 imt_ref->GetInterfaceMethodIfProxy()); 4498 if (imt_ref_name_comparator.HasSameNameAndSignature( 4499 vtable_method_for_name_comparison)) { 4500 out_imt->SetReference(imt_index, vtable_method); 4501 } else { 4502 out_imt->SetReference(imt_index, conflict_method); 4503 } 4504 } 4505 break; 4506 } 4507 } 4508 if (k < 0 && !super_interface) { 4509 mirror::ArtMethod* miranda_method = nullptr; 4510 for (size_t l = 0; l < miranda_list_size; ++l) { 4511 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4512 if (interface_name_comparator.HasSameNameAndSignature(mir_method)) { 4513 miranda_method = mir_method; 4514 break; 4515 } 4516 } 4517 if (miranda_method == nullptr) { 4518 // Point the interface table at a phantom slot. 4519 miranda_method = interface_method->Clone(self)->AsArtMethod(); 4520 if (UNLIKELY(miranda_method == nullptr)) { 4521 CHECK(self->IsExceptionPending()); // OOME. 4522 return false; 4523 } 4524 DCHECK_LT(miranda_list_size, max_miranda_methods); 4525 miranda_list->Set<false>(miranda_list_size++, miranda_method); 4526 } 4527 method_array->SetWithoutChecks<false>(j, miranda_method); 4528 } 4529 } 4530 } 4531 } 4532 if (miranda_list_size > 0) { 4533 int old_method_count = klass->NumVirtualMethods(); 4534 int new_method_count = old_method_count + miranda_list_size; 4535 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4536 if (old_method_count == 0) { 4537 virtuals = AllocArtMethodArray(self, new_method_count); 4538 } else { 4539 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4540 } 4541 if (UNLIKELY(virtuals == nullptr)) { 4542 CHECK(self->IsExceptionPending()); // OOME. 4543 return false; 4544 } 4545 klass->SetVirtualMethods(virtuals); 4546 4547 int old_vtable_count = vtable->GetLength(); 4548 int new_vtable_count = old_vtable_count + miranda_list_size; 4549 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4550 if (UNLIKELY(vtable.Get() == nullptr)) { 4551 CHECK(self->IsExceptionPending()); // OOME. 4552 return false; 4553 } 4554 for (size_t i = 0; i < miranda_list_size; ++i) { 4555 mirror::ArtMethod* method = miranda_list->Get(i); 4556 // Leave the declaring class alone as type indices are relative to it 4557 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4558 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4559 klass->SetVirtualMethod(old_method_count + i, method); 4560 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 4561 } 4562 // TODO: do not assign to the vtable field until it is fully constructed. 4563 klass->SetVTable(vtable.Get()); 4564 } 4565 4566 if (kIsDebugBuild) { 4567 mirror::ObjectArray<mirror::ArtMethod>* check_vtable = klass->GetVTableDuringLinking(); 4568 for (int i = 0; i < check_vtable->GetLength(); ++i) { 4569 CHECK(check_vtable->GetWithoutChecks(i) != nullptr); 4570 } 4571 } 4572 4573 self->AllowThreadSuspension(); 4574 return true; 4575} 4576 4577bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 4578 CHECK(klass.Get() != nullptr); 4579 return LinkFields(self, klass, false, nullptr); 4580} 4581 4582bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 4583 CHECK(klass.Get() != nullptr); 4584 return LinkFields(self, klass, true, class_size); 4585} 4586 4587struct LinkFieldsComparator { 4588 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4589 } 4590 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4591 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4592 NO_THREAD_SAFETY_ANALYSIS { 4593 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4594 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4595 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4596 if (type1 != type2) { 4597 if (type1 == Primitive::kPrimNot) { 4598 // Reference always goes first. 4599 return true; 4600 } 4601 if (type2 == Primitive::kPrimNot) { 4602 // Reference always goes first. 4603 return false; 4604 } 4605 size_t size1 = Primitive::ComponentSize(type1); 4606 size_t size2 = Primitive::ComponentSize(type2); 4607 if (size1 != size2) { 4608 // Larger primitive types go first. 4609 return size1 > size2; 4610 } 4611 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 4612 return type1 < type2; 4613 } 4614 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 4615 // by name and for equal names by type id index. 4616 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 4617 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 4618 } 4619}; 4620 4621bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 4622 size_t* class_size) { 4623 self->AllowThreadSuspension(); 4624 size_t num_fields = 4625 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4626 4627 mirror::ObjectArray<mirror::ArtField>* fields = 4628 is_static ? klass->GetSFields() : klass->GetIFields(); 4629 4630 // Initialize field_offset 4631 MemberOffset field_offset(0); 4632 if (is_static) { 4633 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 4634 } else { 4635 mirror::Class* super_class = klass->GetSuperClass(); 4636 if (super_class != nullptr) { 4637 CHECK(super_class->IsResolved()) 4638 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4639 field_offset = MemberOffset(super_class->GetObjectSize()); 4640 } 4641 } 4642 4643 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 4644 4645 // we want a relatively stable order so that adding new fields 4646 // minimizes disruption of C++ version such as Class and Method. 4647 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4648 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 4649 "Naked ArtField references in deque"); 4650 for (size_t i = 0; i < num_fields; i++) { 4651 mirror::ArtField* f = fields->Get(i); 4652 CHECK(f != nullptr) << PrettyClass(klass.Get()); 4653 grouped_and_sorted_fields.push_back(f); 4654 } 4655 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4656 LinkFieldsComparator()); 4657 4658 // References should be at the front. 4659 size_t current_field = 0; 4660 size_t num_reference_fields = 0; 4661 FieldGaps gaps; 4662 4663 for (; current_field < num_fields; current_field++) { 4664 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4665 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4666 bool isPrimitive = type != Primitive::kPrimNot; 4667 if (isPrimitive) { 4668 break; // past last reference, move on to the next phase 4669 } 4670 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>( 4671 field_offset.Uint32Value()))) { 4672 MemberOffset old_offset = field_offset; 4673 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 4674 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 4675 } 4676 DCHECK(IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(field_offset.Uint32Value())); 4677 grouped_and_sorted_fields.pop_front(); 4678 num_reference_fields++; 4679 field->SetOffset(field_offset); 4680 field_offset = MemberOffset(field_offset.Uint32Value() + 4681 sizeof(mirror::HeapReference<mirror::Object>)); 4682 } 4683 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 4684 // otherwise we could end up with suboptimal gap fills. 4685 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 4686 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 4687 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 4688 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 4689 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 4690 " fields."; 4691 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 4692 4693 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4694 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4695 // We know there are no non-reference fields in the Reference classes, and we know 4696 // that 'referent' is alphabetically last, so this is easy... 4697 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4698 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4699 --num_reference_fields; 4700 } 4701 4702 size_t size = field_offset.Uint32Value(); 4703 // Update klass 4704 if (is_static) { 4705 klass->SetNumReferenceStaticFields(num_reference_fields); 4706 *class_size = size; 4707 } else { 4708 klass->SetNumReferenceInstanceFields(num_reference_fields); 4709 if (!klass->IsVariableSize()) { 4710 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 4711 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 4712 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 4713 } else { 4714 std::string temp; 4715 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4716 size_t previous_size = klass->GetObjectSize(); 4717 if (previous_size != 0) { 4718 // Make sure that we didn't originally have an incorrect size. 4719 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4720 } 4721 klass->SetObjectSize(size); 4722 } 4723 } 4724 } 4725 4726 if (kIsDebugBuild) { 4727 // Make sure that the fields array is ordered by name but all reference 4728 // offsets are at the beginning as far as alignment allows. 4729 MemberOffset start_ref_offset = is_static 4730 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 4731 : klass->GetFirstReferenceInstanceFieldOffset(); 4732 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 4733 num_reference_fields * 4734 sizeof(mirror::HeapReference<mirror::Object>)); 4735 MemberOffset current_ref_offset = start_ref_offset; 4736 for (size_t i = 0; i < num_fields; i++) { 4737 mirror::ArtField* field = fields->Get(i); 4738 if ((false)) { // enable to debug field layout 4739 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4740 << " class=" << PrettyClass(klass.Get()) 4741 << " field=" << PrettyField(field) 4742 << " offset=" 4743 << field->GetField32(mirror::ArtField::OffsetOffset()); 4744 } 4745 if (i != 0) { 4746 mirror::ArtField* prev_field = fields->Get(i - 1u); 4747 // NOTE: The field names can be the same. This is not possible in the Java language 4748 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 4749 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 4750 } 4751 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4752 bool is_primitive = type != Primitive::kPrimNot; 4753 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4754 strcmp("referent", field->GetName()) == 0) { 4755 is_primitive = true; // We lied above, so we have to expect a lie here. 4756 } 4757 MemberOffset offset = field->GetOffsetDuringLinking(); 4758 if (is_primitive) { 4759 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 4760 // Shuffled before references. 4761 size_t type_size = Primitive::ComponentSize(type); 4762 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 4763 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 4764 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 4765 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 4766 } 4767 } else { 4768 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 4769 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 4770 sizeof(mirror::HeapReference<mirror::Object>)); 4771 } 4772 } 4773 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 4774 } 4775 return true; 4776} 4777 4778// Set the bitmap of reference instance field offsets. 4779void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4780 uint32_t reference_offsets = 0; 4781 mirror::Class* super_class = klass->GetSuperClass(); 4782 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 4783 if (super_class != nullptr) { 4784 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4785 // Compute reference offsets unless our superclass overflowed. 4786 if (reference_offsets != mirror::Class::kClassWalkSuper) { 4787 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 4788 if (num_reference_fields != 0u) { 4789 // All of the fields that contain object references are guaranteed be grouped in memory 4790 // starting at an appropriately aligned address after super class object data. 4791 uint32_t start_offset = RoundUp(super_class->GetObjectSize(), 4792 sizeof(mirror::HeapReference<mirror::Object>)); 4793 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) / 4794 sizeof(mirror::HeapReference<mirror::Object>); 4795 if (start_bit + num_reference_fields > 32) { 4796 reference_offsets = mirror::Class::kClassWalkSuper; 4797 } else { 4798 reference_offsets |= (0xffffffffu << start_bit) & 4799 (0xffffffffu >> (32 - (start_bit + num_reference_fields))); 4800 } 4801 } 4802 } 4803 } 4804 klass->SetReferenceInstanceOffsets(reference_offsets); 4805} 4806 4807mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4808 Handle<mirror::DexCache> dex_cache) { 4809 DCHECK(dex_cache.Get() != nullptr); 4810 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4811 if (resolved != nullptr) { 4812 return resolved; 4813 } 4814 uint32_t utf16_length; 4815 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4816 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4817 dex_cache->SetResolvedString(string_idx, string); 4818 return string; 4819} 4820 4821mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4822 mirror::Class* referrer) { 4823 StackHandleScope<2> hs(Thread::Current()); 4824 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4825 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4826 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4827} 4828 4829mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4830 Handle<mirror::DexCache> dex_cache, 4831 Handle<mirror::ClassLoader> class_loader) { 4832 DCHECK(dex_cache.Get() != nullptr); 4833 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4834 if (resolved == nullptr) { 4835 Thread* self = Thread::Current(); 4836 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4837 resolved = FindClass(self, descriptor, class_loader); 4838 if (resolved != nullptr) { 4839 // TODO: we used to throw here if resolved's class loader was not the 4840 // boot class loader. This was to permit different classes with the 4841 // same name to be loaded simultaneously by different loaders 4842 dex_cache->SetResolvedType(type_idx, resolved); 4843 } else { 4844 CHECK(self->IsExceptionPending()) 4845 << "Expected pending exception for failed resolution of: " << descriptor; 4846 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4847 StackHandleScope<1> hs(self); 4848 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException())); 4849 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4850 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 4851 self->ClearException(); 4852 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4853 self->GetException()->SetCause(cause.Get()); 4854 } 4855 } 4856 } 4857 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 4858 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4859 return resolved; 4860} 4861 4862mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4863 Handle<mirror::DexCache> dex_cache, 4864 Handle<mirror::ClassLoader> class_loader, 4865 Handle<mirror::ArtMethod> referrer, 4866 InvokeType type) { 4867 DCHECK(dex_cache.Get() != nullptr); 4868 // Check for hit in the dex cache. 4869 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4870 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4871 return resolved; 4872 } 4873 // Fail, get the declaring class. 4874 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4875 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4876 if (klass == nullptr) { 4877 DCHECK(Thread::Current()->IsExceptionPending()); 4878 return nullptr; 4879 } 4880 // Scan using method_idx, this saves string compares but will only hit for matching dex 4881 // caches/files. 4882 switch (type) { 4883 case kDirect: // Fall-through. 4884 case kStatic: 4885 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4886 break; 4887 case kInterface: 4888 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4889 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4890 break; 4891 case kSuper: // Fall-through. 4892 case kVirtual: 4893 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4894 break; 4895 default: 4896 LOG(FATAL) << "Unreachable - invocation type: " << type; 4897 UNREACHABLE(); 4898 } 4899 if (resolved == nullptr) { 4900 // Search by name, which works across dex files. 4901 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4902 const Signature signature = dex_file.GetMethodSignature(method_id); 4903 switch (type) { 4904 case kDirect: // Fall-through. 4905 case kStatic: 4906 resolved = klass->FindDirectMethod(name, signature); 4907 break; 4908 case kInterface: 4909 resolved = klass->FindInterfaceMethod(name, signature); 4910 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4911 break; 4912 case kSuper: // Fall-through. 4913 case kVirtual: 4914 resolved = klass->FindVirtualMethod(name, signature); 4915 break; 4916 } 4917 } 4918 // If we found a method, check for incompatible class changes. 4919 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 4920 // Be a good citizen and update the dex cache to speed subsequent calls. 4921 dex_cache->SetResolvedMethod(method_idx, resolved); 4922 return resolved; 4923 } else { 4924 // If we had a method, it's an incompatible-class-change error. 4925 if (resolved != nullptr) { 4926 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 4927 } else { 4928 // We failed to find the method which means either an access error, an incompatible class 4929 // change, or no such method. First try to find the method among direct and virtual methods. 4930 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4931 const Signature signature = dex_file.GetMethodSignature(method_id); 4932 switch (type) { 4933 case kDirect: 4934 case kStatic: 4935 resolved = klass->FindVirtualMethod(name, signature); 4936 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 4937 // have had a resolved method before, which triggers the "true" branch above. 4938 break; 4939 case kInterface: 4940 case kVirtual: 4941 case kSuper: 4942 resolved = klass->FindDirectMethod(name, signature); 4943 break; 4944 } 4945 4946 // If we found something, check that it can be accessed by the referrer. 4947 bool exception_generated = false; 4948 if (resolved != nullptr && referrer.Get() != nullptr) { 4949 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4950 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4951 if (!referring_class->CanAccess(methods_class)) { 4952 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4953 resolved, type); 4954 exception_generated = true; 4955 } else if (!referring_class->CanAccessMember(methods_class, 4956 resolved->GetAccessFlags())) { 4957 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4958 exception_generated = true; 4959 } 4960 } 4961 if (!exception_generated) { 4962 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check 4963 // interface methods and throw if we find the method there. If we find nothing, throw a 4964 // NoSuchMethodError. 4965 switch (type) { 4966 case kDirect: 4967 case kStatic: 4968 if (resolved != nullptr) { 4969 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4970 } else { 4971 resolved = klass->FindInterfaceMethod(name, signature); 4972 if (resolved != nullptr) { 4973 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4974 } else { 4975 ThrowNoSuchMethodError(type, klass, name, signature); 4976 } 4977 } 4978 break; 4979 case kInterface: 4980 if (resolved != nullptr) { 4981 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4982 } else { 4983 resolved = klass->FindVirtualMethod(name, signature); 4984 if (resolved != nullptr) { 4985 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4986 } else { 4987 ThrowNoSuchMethodError(type, klass, name, signature); 4988 } 4989 } 4990 break; 4991 case kSuper: 4992 if (resolved != nullptr) { 4993 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4994 } else { 4995 ThrowNoSuchMethodError(type, klass, name, signature); 4996 } 4997 break; 4998 case kVirtual: 4999 if (resolved != nullptr) { 5000 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5001 } else { 5002 resolved = klass->FindInterfaceMethod(name, signature); 5003 if (resolved != nullptr) { 5004 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5005 } else { 5006 ThrowNoSuchMethodError(type, klass, name, signature); 5007 } 5008 } 5009 break; 5010 } 5011 } 5012 } 5013 Thread::Current()->AssertPendingException(); 5014 return nullptr; 5015 } 5016} 5017 5018mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5019 Handle<mirror::DexCache> dex_cache, 5020 Handle<mirror::ClassLoader> class_loader, 5021 bool is_static) { 5022 DCHECK(dex_cache.Get() != nullptr); 5023 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5024 if (resolved != nullptr) { 5025 return resolved; 5026 } 5027 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5028 Thread* const self = Thread::Current(); 5029 StackHandleScope<1> hs(self); 5030 Handle<mirror::Class> klass( 5031 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5032 if (klass.Get() == nullptr) { 5033 DCHECK(Thread::Current()->IsExceptionPending()); 5034 return nullptr; 5035 } 5036 5037 if (is_static) { 5038 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5039 } else { 5040 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5041 } 5042 5043 if (resolved == nullptr) { 5044 const char* name = dex_file.GetFieldName(field_id); 5045 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5046 if (is_static) { 5047 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5048 } else { 5049 resolved = klass->FindInstanceField(name, type); 5050 } 5051 if (resolved == nullptr) { 5052 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5053 return nullptr; 5054 } 5055 } 5056 dex_cache->SetResolvedField(field_idx, resolved); 5057 return resolved; 5058} 5059 5060mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5061 uint32_t field_idx, 5062 Handle<mirror::DexCache> dex_cache, 5063 Handle<mirror::ClassLoader> class_loader) { 5064 DCHECK(dex_cache.Get() != nullptr); 5065 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5066 if (resolved != nullptr) { 5067 return resolved; 5068 } 5069 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5070 Thread* self = Thread::Current(); 5071 StackHandleScope<1> hs(self); 5072 Handle<mirror::Class> klass( 5073 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5074 if (klass.Get() == nullptr) { 5075 DCHECK(Thread::Current()->IsExceptionPending()); 5076 return nullptr; 5077 } 5078 5079 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5080 StringPiece type(dex_file.StringDataByIdx( 5081 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5082 resolved = mirror::Class::FindField(self, klass, name, type); 5083 if (resolved != nullptr) { 5084 dex_cache->SetResolvedField(field_idx, resolved); 5085 } else { 5086 ThrowNoSuchFieldError("", klass.Get(), type, name); 5087 } 5088 return resolved; 5089} 5090 5091const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5092 uint32_t* length) { 5093 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5094 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5095 const DexFile& dex_file = *dex_cache->GetDexFile(); 5096 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5097 return dex_file.GetMethodShorty(method_id, length); 5098} 5099 5100void ClassLinker::DumpAllClasses(int flags) { 5101 if (dex_cache_image_class_lookup_required_) { 5102 MoveImageClassesToClassTable(); 5103 } 5104 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5105 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5106 std::vector<mirror::Class*> all_classes; 5107 { 5108 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5109 for (GcRoot<mirror::Class>& it : class_table_) { 5110 all_classes.push_back(it.Read()); 5111 } 5112 } 5113 5114 for (size_t i = 0; i < all_classes.size(); ++i) { 5115 all_classes[i]->DumpClass(std::cerr, flags); 5116 } 5117} 5118 5119static OatFile::OatMethod CreateOatMethod(const void* code) { 5120 CHECK(code != nullptr); 5121 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5122 base -= sizeof(void*); // Move backward so that code_offset != 0. 5123 const uint32_t code_offset = sizeof(void*); 5124 return OatFile::OatMethod(base, code_offset); 5125} 5126 5127bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5128 return (entry_point == GetQuickResolutionStub()) || 5129 (quick_resolution_trampoline_ == entry_point); 5130} 5131 5132bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5133 return (entry_point == GetQuickToInterpreterBridge()) || 5134 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5135} 5136 5137bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5138 return (entry_point == GetQuickGenericJniStub()) || 5139 (quick_generic_jni_trampoline_ == entry_point); 5140} 5141 5142const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5143 return GetQuickGenericJniStub(); 5144} 5145 5146void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, 5147 const void* method_code) const { 5148 OatFile::OatMethod oat_method = CreateOatMethod(method_code); 5149 oat_method.LinkMethod(method); 5150 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5151} 5152 5153void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5154 if (!method->IsNative()) { 5155 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5156 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5157 } else { 5158 const void* quick_method_code = GetQuickGenericJniStub(); 5159 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code); 5160 oat_method.LinkMethod(method); 5161 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5162 } 5163} 5164 5165void ClassLinker::DumpForSigQuit(std::ostream& os) { 5166 Thread* self = Thread::Current(); 5167 if (dex_cache_image_class_lookup_required_) { 5168 ScopedObjectAccess soa(self); 5169 MoveImageClassesToClassTable(); 5170 } 5171 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5172 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5173 << class_table_.Size() << "\n"; 5174} 5175 5176size_t ClassLinker::NumLoadedClasses() { 5177 if (dex_cache_image_class_lookup_required_) { 5178 MoveImageClassesToClassTable(); 5179 } 5180 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5181 // Only return non zygote classes since these are the ones which apps which care about. 5182 return class_table_.Size(); 5183} 5184 5185pid_t ClassLinker::GetClassesLockOwner() { 5186 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5187} 5188 5189pid_t ClassLinker::GetDexLockOwner() { 5190 return dex_lock_.GetExclusiveOwnerTid(); 5191} 5192 5193void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5194 DCHECK(!init_done_); 5195 5196 DCHECK(klass != nullptr); 5197 DCHECK(klass->GetClassLoader() == nullptr); 5198 5199 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5200 DCHECK(class_roots != nullptr); 5201 DCHECK(class_roots->Get(class_root) == nullptr); 5202 class_roots->Set<false>(class_root, klass); 5203} 5204 5205const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5206 static const char* class_roots_descriptors[] = { 5207 "Ljava/lang/Class;", 5208 "Ljava/lang/Object;", 5209 "[Ljava/lang/Class;", 5210 "[Ljava/lang/Object;", 5211 "Ljava/lang/String;", 5212 "Ljava/lang/DexCache;", 5213 "Ljava/lang/ref/Reference;", 5214 "Ljava/lang/reflect/ArtField;", 5215 "Ljava/lang/reflect/ArtMethod;", 5216 "Ljava/lang/reflect/Proxy;", 5217 "[Ljava/lang/String;", 5218 "[Ljava/lang/reflect/ArtField;", 5219 "[Ljava/lang/reflect/ArtMethod;", 5220 "Ljava/lang/ClassLoader;", 5221 "Ljava/lang/Throwable;", 5222 "Ljava/lang/ClassNotFoundException;", 5223 "Ljava/lang/StackTraceElement;", 5224 "Z", 5225 "B", 5226 "C", 5227 "D", 5228 "F", 5229 "I", 5230 "J", 5231 "S", 5232 "V", 5233 "[Z", 5234 "[B", 5235 "[C", 5236 "[D", 5237 "[F", 5238 "[I", 5239 "[J", 5240 "[S", 5241 "[Ljava/lang/StackTraceElement;", 5242 }; 5243 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5244 "Mismatch between class descriptors and class-root enum"); 5245 5246 const char* descriptor = class_roots_descriptors[class_root]; 5247 CHECK(descriptor != nullptr); 5248 return descriptor; 5249} 5250 5251std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 5252 const { 5253 std::string temp; 5254 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 5255} 5256 5257bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5258 const GcRoot<mirror::Class>& b) const { 5259 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 5260 return false; 5261 } 5262 std::string temp; 5263 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 5264} 5265 5266std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 5267 const std::pair<const char*, mirror::ClassLoader*>& element) const { 5268 return ComputeModifiedUtf8Hash(element.first); 5269} 5270 5271bool ClassLinker::ClassDescriptorHashEquals::operator()( 5272 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) const { 5273 if (a.Read()->GetClassLoader() != b.second) { 5274 return false; 5275 } 5276 return a.Read()->DescriptorEquals(b.first); 5277} 5278 5279bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5280 const char* descriptor) const { 5281 return a.Read()->DescriptorEquals(descriptor); 5282} 5283 5284std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 5285 return ComputeModifiedUtf8Hash(descriptor); 5286} 5287 5288bool ClassLinker::MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m) { 5289 if (Runtime::Current()->UseJit()) { 5290 // JIT can have direct code pointers from any method to any other method. 5291 return true; 5292 } 5293 // Non-image methods don't use direct code pointer. 5294 if (!m->GetDeclaringClass()->IsBootStrapClassLoaded()) { 5295 return false; 5296 } 5297 if (m->IsPrivate()) { 5298 // The method can only be called inside its own oat file. Therefore it won't be called using 5299 // its direct code if the oat file has been compiled in PIC mode. 5300 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 5301 const DexFile& dex_file = m->GetDeclaringClass()->GetDexFile(); 5302 const OatFile::OatDexFile* oat_dex_file = class_linker->FindOpenedOatDexFileForDexFile(dex_file); 5303 if (oat_dex_file == nullptr) { 5304 // No oat file: the method has not been compiled. 5305 return false; 5306 } 5307 const OatFile* oat_file = oat_dex_file->GetOatFile(); 5308 return oat_file != nullptr && !oat_file->IsPic(); 5309 } else { 5310 // The method can be called outside its own oat file. Therefore it won't be called using its 5311 // direct code pointer only if all loaded oat files have been compiled in PIC mode. 5312 ReaderMutexLock mu(Thread::Current(), dex_lock_); 5313 for (const OatFile* oat_file : oat_files_) { 5314 if (!oat_file->IsPic()) { 5315 return true; 5316 } 5317 } 5318 return false; 5319 } 5320} 5321 5322} // namespace art 5323