class_linker.cc revision c7d11887725e28db2796c848f4485e59d5eb690c
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 "leb128.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread-inl.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 Runtime* runtime = Runtime::Current(); 95 bool is_compiler = runtime->IsCompiler(); 96 if (!is_compiler) { // Give info if this occurs at runtime. 97 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 98 } 99 100 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 101 Thread* self = Thread::Current(); 102 if (is_compiler) { 103 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 104 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 105 self->SetException(ThrowLocation(), pre_allocated); 106 } else { 107 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 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(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 112 PrettyDescriptor(c).c_str()); 113 } else { 114 self->ThrowNewException(throw_location, "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(nullptr)->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 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 144 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 145 nullptr); 146 } 147 VlogClassInitializationFailure(klass); 148} 149 150// Gap between two fields in object layout. 151struct FieldGap { 152 uint32_t start_offset; // The offset from the start of the object. 153 uint32_t size; // The gap size of 1, 2, or 4 bytes. 154}; 155struct FieldGapsComparator { 156 explicit FieldGapsComparator() { 157 } 158 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 159 NO_THREAD_SAFETY_ANALYSIS { 160 // Sort by gap size, largest first. 161 return lhs.size > rhs.size; 162 } 163}; 164typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 165 166// Adds largest aligned gaps to queue of gaps. 167static void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 168 DCHECK(gaps != nullptr); 169 170 uint32_t current_offset = gap_start; 171 while (current_offset != gap_end) { 172 size_t remaining = gap_end - current_offset; 173 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 174 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 175 current_offset += sizeof(uint32_t); 176 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 177 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 178 current_offset += sizeof(uint16_t); 179 } else { 180 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 181 current_offset += sizeof(uint8_t); 182 } 183 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 184 } 185} 186// Shuffle fields forward, making use of gaps whenever possible. 187template<int n> 188static void ShuffleForward(size_t* current_field_idx, 189 MemberOffset* field_offset, 190 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 191 FieldGaps* gaps) 192 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 193 DCHECK(current_field_idx != nullptr); 194 DCHECK(grouped_and_sorted_fields != nullptr); 195 DCHECK(gaps != nullptr); 196 DCHECK(field_offset != nullptr); 197 198 DCHECK(IsPowerOfTwo(n)); 199 while (!grouped_and_sorted_fields->empty()) { 200 mirror::ArtField* field = grouped_and_sorted_fields->front(); 201 Primitive::Type type = field->GetTypeAsPrimitiveType(); 202 if (Primitive::ComponentSize(type) < n) { 203 break; 204 } 205 if (!IsAligned<n>(field_offset->Uint32Value())) { 206 MemberOffset old_offset = *field_offset; 207 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 208 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 209 } 210 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 211 grouped_and_sorted_fields->pop_front(); 212 if (!gaps->empty() && gaps->top().size >= n) { 213 FieldGap gap = gaps->top(); 214 gaps->pop(); 215 DCHECK(IsAligned<n>(gap.start_offset)); 216 field->SetOffset(MemberOffset(gap.start_offset)); 217 if (gap.size > n) { 218 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 219 } 220 } else { 221 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 222 field->SetOffset(*field_offset); 223 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 224 } 225 ++(*current_field_idx); 226 } 227} 228 229ClassLinker::ClassLinker(InternTable* intern_table) 230 // dex_lock_ is recursive as it may be used in stack dumping. 231 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 232 dex_cache_image_class_lookup_required_(false), 233 failed_dex_cache_class_lookups_(0), 234 class_roots_(nullptr), 235 array_iftable_(nullptr), 236 find_array_class_cache_next_victim_(0), 237 init_done_(false), 238 log_new_dex_caches_roots_(false), 239 log_new_class_table_roots_(false), 240 intern_table_(intern_table), 241 quick_resolution_trampoline_(nullptr), 242 quick_imt_conflict_trampoline_(nullptr), 243 quick_generic_jni_trampoline_(nullptr), 244 quick_to_interpreter_bridge_trampoline_(nullptr), 245 image_pointer_size_(sizeof(void*)) { 246 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 247} 248 249void ClassLinker::InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path) { 250 VLOG(startup) << "ClassLinker::Init"; 251 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 252 253 CHECK(!init_done_); 254 255 // java_lang_Class comes first, it's needed for AllocClass 256 Thread* self = Thread::Current(); 257 gc::Heap* heap = Runtime::Current()->GetHeap(); 258 // The GC can't handle an object with a null class since we can't get the size of this object. 259 heap->IncrementDisableMovingGC(self); 260 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 261 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 262 heap->AllocNonMovableObject<true>(self, nullptr, 263 mirror::Class::ClassClassSize(), 264 VoidFunctor())))); 265 CHECK(java_lang_Class.Get() != nullptr); 266 mirror::Class::SetClassClass(java_lang_Class.Get()); 267 java_lang_Class->SetClass(java_lang_Class.Get()); 268 if (kUseBakerOrBrooksReadBarrier) { 269 java_lang_Class->AssertReadBarrierPointer(); 270 } 271 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 272 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 273 heap->DecrementDisableMovingGC(self); 274 // AllocClass(mirror::Class*) can now be used 275 276 // Class[] is used for reflection support. 277 Handle<mirror::Class> class_array_class(hs.NewHandle( 278 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 279 class_array_class->SetComponentType(java_lang_Class.Get()); 280 281 // java_lang_Object comes next so that object_array_class can be created. 282 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 283 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 284 CHECK(java_lang_Object.Get() != nullptr); 285 // backfill Object as the super class of Class. 286 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 287 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 288 289 // Object[] next to hold class roots. 290 Handle<mirror::Class> object_array_class(hs.NewHandle( 291 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 292 object_array_class->SetComponentType(java_lang_Object.Get()); 293 294 // Setup the char (primitive) class to be used for char[]. 295 Handle<mirror::Class> char_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 297 // The primitive char class won't be initialized by 298 // InitializePrimitiveClass until line 459, but strings (and 299 // internal char arrays) will be allocated before that and the 300 // component size, which is computed from the primitive type, needs 301 // to be set here. 302 char_class->SetPrimitiveType(Primitive::kPrimChar); 303 304 // Setup the char[] class to be used for String. 305 Handle<mirror::Class> char_array_class(hs.NewHandle( 306 AllocClass(self, java_lang_Class.Get(), 307 mirror::Array::ClassSize()))); 308 char_array_class->SetComponentType(char_class.Get()); 309 mirror::CharArray::SetArrayClass(char_array_class.Get()); 310 311 // Setup String. 312 Handle<mirror::Class> java_lang_String(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 314 mirror::String::SetClass(java_lang_String.Get()); 315 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 316 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 317 318 // Setup Reference. 319 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 320 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 321 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 322 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 323 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 324 325 // Create storage for root classes, save away our work so far (requires descriptors). 326 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 327 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 328 kClassRootsMax)); 329 CHECK(!class_roots_.IsNull()); 330 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 331 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 332 SetClassRoot(kClassArrayClass, class_array_class.Get()); 333 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 334 SetClassRoot(kCharArrayClass, char_array_class.Get()); 335 SetClassRoot(kJavaLangString, java_lang_String.Get()); 336 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 337 338 // Setup the primitive type classes. 339 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 340 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 341 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 342 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 343 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 344 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 345 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 346 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 347 348 // Create array interface entries to populate once we can load system classes. 349 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 350 351 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 352 Handle<mirror::Class> int_array_class(hs.NewHandle( 353 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 354 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 355 mirror::IntArray::SetArrayClass(int_array_class.Get()); 356 SetClassRoot(kIntArrayClass, int_array_class.Get()); 357 358 // now that these are registered, we can use AllocClass() and AllocObjectArray 359 360 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 361 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 362 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 363 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 364 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 365 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 366 367 // Constructor, Field, Method, and AbstractMethod are necessary so 368 // that FindClass can link members. 369 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 370 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 371 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 372 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 373 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 374 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 375 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 376 377 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 378 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 379 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 380 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 381 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 382 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 383 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 384 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 385 386 // Set up array classes for string, field, method 387 Handle<mirror::Class> object_array_string(hs.NewHandle( 388 AllocClass(self, java_lang_Class.Get(), 389 mirror::ObjectArray<mirror::String>::ClassSize()))); 390 object_array_string->SetComponentType(java_lang_String.Get()); 391 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 392 393 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 394 AllocClass(self, java_lang_Class.Get(), 395 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 396 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 397 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 398 399 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 400 AllocClass(self, java_lang_Class.Get(), 401 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 402 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 403 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 404 405 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 406 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 407 // these roots. 408 CHECK_NE(0U, boot_class_path.size()); 409 for (auto& dex_file : boot_class_path) { 410 CHECK(dex_file.get() != nullptr); 411 AppendToBootClassPath(self, *dex_file); 412 opened_dex_files_.push_back(std::move(dex_file)); 413 } 414 415 // now we can use FindSystemClass 416 417 // run char class through InitializePrimitiveClass to finish init 418 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 419 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 420 421 // Create runtime resolution and imt conflict methods. Also setup the default imt. 422 Runtime* runtime = Runtime::Current(); 423 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 424 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 425 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 426 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 427 428 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 429 // we do not need friend classes or a publicly exposed setter. 430 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 431 if (!runtime->IsCompiler()) { 432 // We need to set up the generic trampolines since we don't have an image. 433 quick_resolution_trampoline_ = GetQuickResolutionStub(); 434 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 435 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 436 } 437 438 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 439 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 440 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 441 CHECK_EQ(java_lang_Object.Get(), Object_class); 442 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 443 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 444 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 445 std::ostringstream os1, os2; 446 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 447 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 448 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 449 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 450 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 452 CHECK_EQ(java_lang_String.Get(), String_class); 453 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 454 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 455 456 // Setup the primitive array type classes - can't be done until Object has a vtable. 457 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 458 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 459 460 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 461 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 462 463 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 464 CHECK_EQ(char_array_class.Get(), found_char_array_class); 465 466 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 467 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 468 469 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 470 CHECK_EQ(int_array_class.Get(), found_int_array_class); 471 472 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 473 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 474 475 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 476 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 477 478 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 479 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 480 481 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 482 CHECK_EQ(class_array_class.Get(), found_class_array_class); 483 484 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 485 CHECK_EQ(object_array_class.Get(), found_object_array_class); 486 487 // Setup the single, global copy of "iftable". 488 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 489 CHECK(java_lang_Cloneable != nullptr); 490 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 491 CHECK(java_io_Serializable != nullptr); 492 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 493 // crawl up and explicitly list all of the supers as well. 494 { 495 mirror::IfTable* array_iftable = array_iftable_.Read(); 496 array_iftable->SetInterface(0, java_lang_Cloneable); 497 array_iftable->SetInterface(1, java_io_Serializable); 498 } 499 500 // Sanity check Class[] and Object[]'s interfaces. 501 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 502 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 503 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 504 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 505 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 506 // dex_cache_ fields and register them in class_table_. 507 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 508 CHECK_EQ(java_lang_Class.Get(), Class_class); 509 510 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 511 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 512 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 513 514 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 515 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 516 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 517 518 mirror::Class* String_array_class = 519 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 520 CHECK_EQ(object_array_string.Get(), String_array_class); 521 522 mirror::Class* Art_method_array_class = 523 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 524 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 525 526 mirror::Class* Art_field_array_class = 527 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 528 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 529 530 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 531 532 // Create java.lang.reflect.Proxy root. 533 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 534 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 535 536 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 537 // finish initializing Reference class 538 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 539 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 540 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 541 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 542 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 543 mirror::Class* java_lang_ref_FinalizerReference = 544 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 545 java_lang_ref_FinalizerReference->SetAccessFlags( 546 java_lang_ref_FinalizerReference->GetAccessFlags() | 547 kAccClassIsReference | kAccClassIsFinalizerReference); 548 mirror::Class* java_lang_ref_PhantomReference = 549 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 550 java_lang_ref_PhantomReference->SetAccessFlags( 551 java_lang_ref_PhantomReference->GetAccessFlags() | 552 kAccClassIsReference | kAccClassIsPhantomReference); 553 mirror::Class* java_lang_ref_SoftReference = 554 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 555 java_lang_ref_SoftReference->SetAccessFlags( 556 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 557 mirror::Class* java_lang_ref_WeakReference = 558 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 559 java_lang_ref_WeakReference->SetAccessFlags( 560 java_lang_ref_WeakReference->GetAccessFlags() | 561 kAccClassIsReference | kAccClassIsWeakReference); 562 563 // Setup the ClassLoader, verifying the object_size_. 564 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 565 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 566 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 567 568 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 569 // java.lang.StackTraceElement as a convenience. 570 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 571 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 572 SetClassRoot(kJavaLangClassNotFoundException, 573 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 574 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 575 SetClassRoot(kJavaLangStackTraceElementArrayClass, 576 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 577 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 578 579 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly 580 // initialized. 581 { 582 const DexFile& dex_file = java_lang_Object->GetDexFile(); 583 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 584 CHECK(void_string_id != nullptr); 585 uint32_t void_string_index = dex_file.GetIndexForStringId(*void_string_id); 586 const DexFile::TypeId* void_type_id = dex_file.FindTypeId(void_string_index); 587 CHECK(void_type_id != nullptr); 588 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id); 589 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class 590 // as referrer so the used dex cache is core's one. 591 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get()); 592 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid)); 593 self->AssertNoPendingException(); 594 } 595 596 FinishInit(self); 597 598 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 599} 600 601void ClassLinker::FinishInit(Thread* self) { 602 VLOG(startup) << "ClassLinker::FinishInit entering"; 603 604 // Let the heap know some key offsets into java.lang.ref instances 605 // Note: we hard code the field indexes here rather than using FindInstanceField 606 // as the types of the field can't be resolved prior to the runtime being 607 // fully initialized 608 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 609 mirror::Class* java_lang_ref_FinalizerReference = 610 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 611 612 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 613 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 614 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 615 616 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 617 CHECK_STREQ(queue->GetName(), "queue"); 618 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 619 620 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 621 CHECK_STREQ(queueNext->GetName(), "queueNext"); 622 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 623 624 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 625 CHECK_STREQ(referent->GetName(), "referent"); 626 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 627 628 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 629 CHECK_STREQ(zombie->GetName(), "zombie"); 630 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 631 632 // ensure all class_roots_ are initialized 633 for (size_t i = 0; i < kClassRootsMax; i++) { 634 ClassRoot class_root = static_cast<ClassRoot>(i); 635 mirror::Class* klass = GetClassRoot(class_root); 636 CHECK(klass != nullptr); 637 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 638 // note SetClassRoot does additional validation. 639 // if possible add new checks there to catch errors early 640 } 641 642 CHECK(!array_iftable_.IsNull()); 643 644 // disable the slow paths in FindClass and CreatePrimitiveClass now 645 // that Object, Class, and Object[] are setup 646 init_done_ = true; 647 648 VLOG(startup) << "ClassLinker::FinishInit exiting"; 649} 650 651void ClassLinker::RunRootClinits() { 652 Thread* self = Thread::Current(); 653 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 654 mirror::Class* c = GetClassRoot(ClassRoot(i)); 655 if (!c->IsArrayClass() && !c->IsPrimitive()) { 656 StackHandleScope<1> hs(self); 657 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 658 EnsureInitialized(self, h_class, true, true); 659 self->AssertNoPendingException(); 660 } 661 } 662} 663 664bool ClassLinker::GenerateOatFile(const char* dex_filename, 665 int oat_fd, 666 const char* oat_cache_filename, 667 std::string* error_msg) { 668 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 669 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 670 671 gc::Heap* heap = Runtime::Current()->GetHeap(); 672 std::string boot_image_option("--boot-image="); 673 if (heap->GetImageSpace() == nullptr) { 674 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 675 // out of space anyway it might not matter. 676 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 677 "without an image.", dex_filename); 678 return false; 679 } 680 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 681 682 std::string dex_file_option("--dex-file="); 683 dex_file_option += dex_filename; 684 685 std::string oat_fd_option("--oat-fd="); 686 StringAppendF(&oat_fd_option, "%d", oat_fd); 687 688 std::string oat_location_option("--oat-location="); 689 oat_location_option += oat_cache_filename; 690 691 std::vector<std::string> argv; 692 argv.push_back(dex2oat); 693 argv.push_back("--runtime-arg"); 694 argv.push_back("-classpath"); 695 argv.push_back("--runtime-arg"); 696 argv.push_back(Runtime::Current()->GetClassPathString()); 697 698 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 699 700 if (!Runtime::Current()->IsVerificationEnabled()) { 701 argv.push_back("--compiler-filter=verify-none"); 702 } 703 704 if (Runtime::Current()->MustRelocateIfPossible()) { 705 argv.push_back("--runtime-arg"); 706 argv.push_back("-Xrelocate"); 707 } else { 708 argv.push_back("--runtime-arg"); 709 argv.push_back("-Xnorelocate"); 710 } 711 712 if (!kIsTargetBuild) { 713 argv.push_back("--host"); 714 } 715 716 argv.push_back(boot_image_option); 717 argv.push_back(dex_file_option); 718 argv.push_back(oat_fd_option); 719 argv.push_back(oat_location_option); 720 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 721 for (size_t i = 0; i < compiler_options.size(); ++i) { 722 argv.push_back(compiler_options[i].c_str()); 723 } 724 725 if (!Exec(argv, error_msg)) { 726 // Manually delete the file. Ensures there is no garbage left over if the process unexpectedly 727 // died. Ignore unlink failure, propagate the original error. 728 TEMP_FAILURE_RETRY(unlink(oat_cache_filename)); 729 return false; 730 } 731 732 return true; 733} 734 735const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 736 WriterMutexLock mu(Thread::Current(), dex_lock_); 737 if (kIsDebugBuild) { 738 for (size_t i = 0; i < oat_files_.size(); ++i) { 739 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 740 } 741 } 742 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 743 oat_files_.push_back(oat_file); 744 return oat_file; 745} 746 747OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 748 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 749 OatFile* oat_file = space->ReleaseOatFile(); 750 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 751 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 752 return *oat_file; 753} 754 755const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 756 const char* dex_location = dex_file.GetLocation().c_str(); 757 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 758 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 759} 760 761const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 762 const char* dex_location, 763 const uint32_t* dex_location_checksum) { 764 ReaderMutexLock mu(Thread::Current(), dex_lock_); 765 for (const OatFile* oat_file : oat_files_) { 766 DCHECK(oat_file != nullptr); 767 768 if (oat_location != nullptr) { 769 if (oat_file->GetLocation() != oat_location) { 770 continue; 771 } 772 } 773 774 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 775 dex_location_checksum, 776 false); 777 if (oat_dex_file != nullptr) { 778 return oat_dex_file; 779 } 780 } 781 return nullptr; 782} 783 784 785// Loads all multi dex files from the given oat file returning true on success. 786// 787// Parameters: 788// oat_file - the oat file to load from 789// dex_location - the dex location used to generate the oat file 790// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 791// generated - whether or not the oat_file existed before or was just (re)generated 792// error_msgs - any error messages will be appended here 793// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 794static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 795 const char* dex_location, 796 const uint32_t* dex_location_checksum, 797 bool generated, 798 std::vector<std::string>* error_msgs, 799 std::vector<std::unique_ptr<const DexFile>>* dex_files) { 800 if (oat_file == nullptr) { 801 return false; 802 } 803 804 size_t old_size = dex_files->size(); // To rollback on error. 805 806 bool success = true; 807 for (size_t i = 0; success; ++i) { 808 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 809 const char* next_name = next_name_str.c_str(); 810 811 uint32_t next_location_checksum; 812 uint32_t* next_location_checksum_pointer = &next_location_checksum; 813 std::string error_msg; 814 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 815 // When i=0 the multidex name should be the same as the location name. We already have the 816 // checksum it so we don't need to recompute it. 817 if (dex_location_checksum == nullptr) { 818 next_location_checksum_pointer = nullptr; 819 } else { 820 next_location_checksum = *dex_location_checksum; 821 } 822 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 823 DCHECK_EQ(false, i == 0 && generated); 824 next_location_checksum_pointer = nullptr; 825 } 826 827 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 828 829 if (oat_dex_file == nullptr) { 830 if (i == 0 && generated) { 831 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 832 " file'%s'", dex_location, next_location_checksum, 833 oat_file->GetLocation().c_str()); 834 error_msgs->push_back(error_msg); 835 } 836 break; // Not found, done. 837 } 838 839 // Checksum test. Test must succeed when generated. 840 success = !generated; 841 if (next_location_checksum_pointer != nullptr) { 842 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 843 } 844 845 if (success) { 846 std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg); 847 if (dex_file.get() == nullptr) { 848 success = false; 849 error_msgs->push_back(error_msg); 850 } else { 851 dex_files->push_back(std::move(dex_file)); 852 } 853 } 854 855 // When we generated the file, we expect success, or something is terribly wrong. 856 CHECK_EQ(false, generated && !success) 857 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 858 << std::hex << " dex_location_checksum=" << next_location_checksum 859 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 860 } 861 862 if (dex_files->size() == old_size) { 863 success = false; // We did not even find classes.dex 864 } 865 866 if (success) { 867 return true; 868 } else { 869 dex_files->erase(dex_files->begin() + old_size, dex_files->end()); 870 return false; 871 } 872} 873 874// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 875// complicates the loading process, as we should not use an iterative loading process, because that 876// would register the oat file and dex files that come before the broken one. Instead, check all 877// multidex ahead of time. 878bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 879 std::vector<std::string>* error_msgs, 880 std::vector<std::unique_ptr<const DexFile>>* dex_files) { 881 // 1) Check whether we have an open oat file. 882 // This requires a dex checksum, use the "primary" one. 883 uint32_t dex_location_checksum; 884 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 885 bool have_checksum = true; 886 std::string checksum_error_msg; 887 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 888 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 889 dex_location_checksum_pointer = nullptr; 890 have_checksum = false; 891 } 892 893 bool needs_registering = false; 894 895 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 896 dex_location_checksum_pointer); 897 std::unique_ptr<const OatFile> open_oat_file( 898 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 899 900 // 2) If we do not have an open one, maybe there's one on disk already. 901 902 // In case the oat file is not open, we play a locking game here so 903 // that if two different processes race to load and register or generate 904 // (or worse, one tries to open a partial generated file) we will be okay. 905 // This is actually common with apps that use DexClassLoader to work 906 // around the dex method reference limit and that have a background 907 // service running in a separate process. 908 ScopedFlock scoped_flock; 909 910 if (open_oat_file.get() == nullptr) { 911 if (oat_location != nullptr) { 912 // Can only do this if we have a checksum, else error. 913 if (!have_checksum) { 914 error_msgs->push_back(checksum_error_msg); 915 return false; 916 } 917 918 std::string error_msg; 919 920 // We are loading or creating one in the future. Time to set up the file lock. 921 if (!scoped_flock.Init(oat_location, &error_msg)) { 922 error_msgs->push_back(error_msg); 923 return false; 924 } 925 926 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 927 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 928 oat_location, &error_msg)); 929 930 if (open_oat_file.get() == nullptr) { 931 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 932 dex_location, oat_location, error_msg.c_str()); 933 VLOG(class_linker) << compound_msg; 934 error_msgs->push_back(compound_msg); 935 } 936 } else { 937 // TODO: What to lock here? 938 bool obsolete_file_cleanup_failed; 939 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 940 dex_location_checksum_pointer, 941 kRuntimeISA, error_msgs, 942 &obsolete_file_cleanup_failed)); 943 // There's no point in going forward and eventually try to regenerate the 944 // file if we couldn't remove the obsolete one. Mostly likely we will fail 945 // with the same error when trying to write the new file. 946 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 947 if (obsolete_file_cleanup_failed) { 948 return false; 949 } 950 } 951 needs_registering = true; 952 } 953 954 // 3) If we have an oat file, check all contained multidex files for our dex_location. 955 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 956 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 957 dex_location_checksum_pointer, 958 false, error_msgs, dex_files); 959 if (success) { 960 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 961 if (needs_registering) { 962 // We opened the oat file, so we must register it. 963 RegisterOatFile(oat_file); 964 } 965 // If the file isn't executable we failed patchoat but did manage to get the dex files. 966 return oat_file->IsExecutable(); 967 } else { 968 if (needs_registering) { 969 // We opened it, delete it. 970 open_oat_file.reset(); 971 } else { 972 open_oat_file.release(); // Do not delete open oat files. 973 } 974 } 975 976 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 977 978 // Need a checksum, fail else. 979 if (!have_checksum) { 980 error_msgs->push_back(checksum_error_msg); 981 return false; 982 } 983 984 // Look in cache location if no oat_location is given. 985 std::string cache_location; 986 if (oat_location == nullptr) { 987 // Use the dalvik cache. 988 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 989 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 990 oat_location = cache_location.c_str(); 991 } 992 993 bool has_flock = true; 994 // Definitely need to lock now. 995 if (!scoped_flock.HasFile()) { 996 std::string error_msg; 997 if (!scoped_flock.Init(oat_location, &error_msg)) { 998 error_msgs->push_back(error_msg); 999 has_flock = false; 1000 } 1001 } 1002 1003 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1004 // Create the oat file. 1005 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1006 oat_location, error_msgs)); 1007 } 1008 1009 // Failed, bail. 1010 if (open_oat_file.get() == nullptr) { 1011 std::string error_msg; 1012 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1013 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1014 error_msgs->push_back(error_msg); 1015 return false; 1016 } 1017 1018 // Try to load again, but stronger checks. 1019 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1020 dex_location_checksum_pointer, 1021 true, error_msgs, dex_files); 1022 if (success) { 1023 RegisterOatFile(open_oat_file.release()); 1024 return true; 1025 } else { 1026 return false; 1027 } 1028} 1029 1030const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1031 uint32_t dex_location_checksum, 1032 const char* oat_location, 1033 std::string* error_msg) { 1034 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1035 !Runtime::Current()->IsCompiler(), 1036 error_msg)); 1037 if (oat_file.get() == nullptr) { 1038 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1039 error_msg->c_str()); 1040 return nullptr; 1041 } 1042 Runtime* runtime = Runtime::Current(); 1043 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1044 if (image_space != nullptr) { 1045 const ImageHeader& image_header = image_space->GetImageHeader(); 1046 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1047 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1048 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1049 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1050 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1051 actual_image_oat_checksum); 1052 return nullptr; 1053 } 1054 1055 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1056 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1057 if (expected_image_oat_offset != actual_image_oat_offset) { 1058 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1059 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1060 actual_image_oat_offset); 1061 return nullptr; 1062 } 1063 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1064 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1065 if (expected_patch_delta != actual_patch_delta) { 1066 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1067 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1068 return nullptr; 1069 } 1070 } 1071 1072 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1073 &dex_location_checksum); 1074 if (oat_dex_file == nullptr) { 1075 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1076 dex_location); 1077 return nullptr; 1078 } 1079 uint32_t expected_dex_checksum = dex_location_checksum; 1080 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1081 if (expected_dex_checksum != actual_dex_checksum) { 1082 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1083 "found 0x%x", oat_location, expected_dex_checksum, 1084 actual_dex_checksum); 1085 return nullptr; 1086 } 1087 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1088 if (dex_file.get() != nullptr) { 1089 return oat_file.release(); 1090 } else { 1091 return nullptr; 1092 } 1093} 1094 1095const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1096 int fd, const char* oat_location, 1097 std::vector<std::string>* error_msgs) { 1098 // Generate the output oat file for the dex file 1099 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1100 std::string error_msg; 1101 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1102 CHECK(!error_msg.empty()); 1103 error_msgs->push_back(error_msg); 1104 return nullptr; 1105 } 1106 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1107 !Runtime::Current()->IsCompiler(), 1108 &error_msg)); 1109 if (oat_file.get() == nullptr) { 1110 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1111 oat_location, error_msg.c_str()); 1112 error_msgs->push_back(compound_msg); 1113 return nullptr; 1114 } 1115 1116 return oat_file.release(); 1117} 1118 1119bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1120 const InstructionSet instruction_set) { 1121 Runtime* runtime = Runtime::Current(); 1122 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1123 if (image_space == nullptr) { 1124 return false; 1125 } 1126 uint32_t image_oat_checksum = 0; 1127 if (instruction_set == kRuntimeISA) { 1128 const ImageHeader& image_header = image_space->GetImageHeader(); 1129 image_oat_checksum = image_header.GetOatChecksum(); 1130 } else { 1131 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1132 image_space->GetImageLocation().c_str(), instruction_set)); 1133 image_oat_checksum = image_header->GetOatChecksum(); 1134 } 1135 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1136} 1137 1138bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1139 const InstructionSet instruction_set, 1140 std::string* error_msg) { 1141 Runtime* runtime = Runtime::Current(); 1142 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1143 if (image_space == nullptr) { 1144 *error_msg = "No image space for verification against"; 1145 return false; 1146 } 1147 1148 // If the requested instruction set is the same as the current runtime, 1149 // we can use the checksums directly. If it isn't, we'll have to read the 1150 // image header from the image for the right instruction set. 1151 uint32_t image_oat_checksum = 0; 1152 uintptr_t image_oat_data_begin = 0; 1153 int32_t image_patch_delta = 0; 1154 if (instruction_set == runtime->GetInstructionSet()) { 1155 const ImageHeader& image_header = image_space->GetImageHeader(); 1156 image_oat_checksum = image_header.GetOatChecksum(); 1157 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1158 image_patch_delta = image_header.GetPatchDelta(); 1159 } else { 1160 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1161 image_space->GetImageLocation().c_str(), instruction_set)); 1162 image_oat_checksum = image_header->GetOatChecksum(); 1163 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1164 image_patch_delta = image_header->GetPatchDelta(); 1165 } 1166 const OatHeader& oat_header = oat_file->GetOatHeader(); 1167 bool ret = (oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum); 1168 1169 // If the oat file is PIC, it doesn't care if/how image was relocated. Ignore these checks. 1170 if (!oat_file->IsPic()) { 1171 ret = ret && (oat_header.GetImagePatchDelta() == image_patch_delta) 1172 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin); 1173 } 1174 if (!ret) { 1175 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1176 oat_file->GetLocation().c_str(), 1177 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1178 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1179 oat_file->GetOatHeader().GetImagePatchDelta(), 1180 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1181 } 1182 return ret; 1183} 1184 1185bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1186 const char* dex_location, 1187 uint32_t dex_location_checksum, 1188 const InstructionSet instruction_set, 1189 std::string* error_msg) { 1190 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1191 return false; 1192 } 1193 1194 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1195 &dex_location_checksum); 1196 if (oat_dex_file == nullptr) { 1197 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1198 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1199 for (const OatFile::OatDexFile* oat_dex_file_in : oat_file->GetOatDexFiles()) { 1200 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1201 oat_file->GetLocation().c_str(), 1202 oat_dex_file_in->GetDexFileLocation().c_str(), 1203 oat_dex_file_in->GetDexFileLocationChecksum()); 1204 } 1205 return false; 1206 } 1207 1208 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1209 return true; 1210} 1211 1212bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1213 const char* dex_location, 1214 const uint32_t* dex_location_checksum, 1215 std::string* error_msg) { 1216 CHECK(oat_file != nullptr); 1217 CHECK(dex_location != nullptr); 1218 std::unique_ptr<const DexFile> dex_file; 1219 if (dex_location_checksum == nullptr) { 1220 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1221 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1222 // directory. 1223 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1224 if (oat_dex_file == nullptr) { 1225 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1226 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1227 error_msg->c_str()); 1228 return false; 1229 } 1230 dex_file = oat_dex_file->OpenDexFile(error_msg); 1231 } else { 1232 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1233 kRuntimeISA, error_msg); 1234 if (!verified) { 1235 return false; 1236 } 1237 dex_file = oat_file->GetOatDexFile(dex_location, 1238 dex_location_checksum)->OpenDexFile(error_msg); 1239 } 1240 return dex_file.get() != nullptr; 1241} 1242 1243const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1244 const char* dex_location, 1245 const uint32_t* dex_location_checksum, 1246 InstructionSet isa, 1247 std::vector<std::string>* error_msgs, 1248 bool* obsolete_file_cleanup_failed) { 1249 *obsolete_file_cleanup_failed = false; 1250 bool already_opened = false; 1251 std::string dex_location_str(dex_location); 1252 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1253 &already_opened, 1254 obsolete_file_cleanup_failed, 1255 error_msgs)); 1256 std::string error_msg; 1257 if (oat_file.get() == nullptr) { 1258 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1259 dex_location)); 1260 return nullptr; 1261 } else if (oat_file->IsExecutable() && 1262 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1263 dex_location_checksum, &error_msg)) { 1264 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1265 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1266 error_msg.c_str())); 1267 return nullptr; 1268 } else if (!oat_file->IsExecutable() && 1269 Runtime::Current()->GetHeap()->HasImageSpace() && 1270 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1271 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1272 "dex location '%s'. Image checksum incorrect.", 1273 oat_file->GetLocation().c_str(), dex_location)); 1274 return nullptr; 1275 } else { 1276 return oat_file.release(); 1277 } 1278} 1279 1280const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1281 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1282 for (size_t i = 0; i < oat_files_.size(); i++) { 1283 const OatFile* oat_file = oat_files_[i]; 1284 DCHECK(oat_file != nullptr); 1285 if (oat_file->GetLocation() == oat_location) { 1286 return oat_file; 1287 } 1288 } 1289 return nullptr; 1290} 1291 1292const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1293 InstructionSet isa, 1294 bool *already_opened, 1295 bool *obsolete_file_cleanup_failed, 1296 std::vector<std::string>* error_msgs) { 1297 // Find out if we've already opened the file 1298 const OatFile* ret = nullptr; 1299 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1300 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1301 if (ret != nullptr) { 1302 *already_opened = true; 1303 return ret; 1304 } 1305 1306 std::string dalvik_cache; 1307 bool have_android_data = false; 1308 bool have_dalvik_cache = false; 1309 bool is_global_cache = false; 1310 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1311 &have_android_data, &have_dalvik_cache, &is_global_cache); 1312 std::string cache_filename; 1313 if (have_dalvik_cache) { 1314 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1315 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1316 if (ret != nullptr) { 1317 *already_opened = true; 1318 return ret; 1319 } 1320 } else { 1321 // If we need to relocate we should just place odex back where it started. 1322 cache_filename = odex_filename; 1323 } 1324 1325 ret = nullptr; 1326 1327 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1328 // 1329 // Now we do the following: 1330 // 1) Try and open the odex version 1331 // 2) If present, checksum-verified & relocated correctly return it 1332 // 3) Close the odex version to free up its address space. 1333 // 4) Try and open the cache version 1334 // 5) If present, checksum-verified & relocated correctly return it 1335 // 6) Close the cache version to free up its address space. 1336 // 7) If we should relocate: 1337 // a) If we have opened and checksum-verified the odex version relocate it to 1338 // 'cache_filename' and return it 1339 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1340 // it. This should not happen often (I think only the run-test's will hit this case). 1341 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1342 // this point. 1343 // 9) Return nullptr 1344 1345 *already_opened = false; 1346 const Runtime* runtime = Runtime::Current(); 1347 CHECK(runtime != nullptr); 1348 bool executable = !runtime->IsCompiler(); 1349 1350 std::string odex_error_msg; 1351 bool should_patch_system = false; 1352 bool odex_checksum_verified = false; 1353 bool have_system_odex = false; 1354 { 1355 // There is a high probability that both these oat files map similar/the same address 1356 // spaces so we must scope them like this so they each gets its turn. 1357 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1358 nullptr, 1359 executable, &odex_error_msg)); 1360 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1361 &odex_checksum_verified, 1362 &odex_error_msg)) { 1363 return odex_oat_file.release(); 1364 } else { 1365 if (odex_checksum_verified) { 1366 // We can just relocate 1367 should_patch_system = true; 1368 odex_error_msg = "Image Patches are incorrect"; 1369 } 1370 if (odex_oat_file.get() != nullptr) { 1371 have_system_odex = true; 1372 } 1373 } 1374 } 1375 1376 std::string cache_error_msg; 1377 bool should_patch_cache = false; 1378 bool cache_checksum_verified = false; 1379 if (have_dalvik_cache) { 1380 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1381 nullptr, 1382 executable, &cache_error_msg)); 1383 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1384 &cache_checksum_verified, 1385 &cache_error_msg)) { 1386 return cache_oat_file.release(); 1387 } else if (cache_checksum_verified) { 1388 // We can just relocate 1389 should_patch_cache = true; 1390 cache_error_msg = "Image Patches are incorrect"; 1391 } 1392 } else if (have_android_data) { 1393 // dalvik_cache does not exist but android data does. This means we should be able to create 1394 // it, so we should try. 1395 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1396 } 1397 1398 ret = nullptr; 1399 std::string error_msg; 1400 if (runtime->CanRelocate()) { 1401 // Run relocation 1402 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1403 if (space != nullptr) { 1404 const std::string& image_location = space->GetImageLocation(); 1405 if (odex_checksum_verified && should_patch_system) { 1406 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1407 } else if (cache_checksum_verified && should_patch_cache) { 1408 CHECK(have_dalvik_cache); 1409 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1410 } 1411 } else if (have_system_odex) { 1412 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1413 } 1414 } 1415 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1416 // implicitly: were able to fine where the cached version is but we were unable to use it, 1417 // either as a destination for relocation or to open a file. We should delete it if it is 1418 // there. 1419 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1420 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1421 "searching for dex file %s: %s", 1422 cache_filename.c_str(), dex_location.c_str(), 1423 strerror(errno)); 1424 error_msgs->push_back(rm_error_msg); 1425 VLOG(class_linker) << rm_error_msg; 1426 // Let the caller know that we couldn't remove the obsolete file. 1427 // This is a good indication that further writes may fail as well. 1428 *obsolete_file_cleanup_failed = true; 1429 } 1430 } 1431 if (ret == nullptr) { 1432 VLOG(class_linker) << error_msg; 1433 error_msgs->push_back(error_msg); 1434 std::string relocation_msg; 1435 if (runtime->CanRelocate()) { 1436 relocation_msg = StringPrintf(" and relocation failed"); 1437 } 1438 if (have_dalvik_cache && cache_checksum_verified) { 1439 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1440 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1441 cache_filename.c_str(), cache_error_msg.c_str(), 1442 relocation_msg.c_str()); 1443 } else { 1444 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1445 "dalvik_cache availible)%s.", odex_filename.c_str(), 1446 odex_error_msg.c_str(), relocation_msg.c_str()); 1447 } 1448 VLOG(class_linker) << error_msg; 1449 error_msgs->push_back(error_msg); 1450 } 1451 return ret; 1452} 1453 1454const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1455 InstructionSet isa, 1456 std::string* error_msg) { 1457 // We open it non-executable 1458 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, nullptr, false, error_msg)); 1459 if (output.get() == nullptr) { 1460 return nullptr; 1461 } 1462 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1463 VerifyOatImageChecksum(output.get(), isa)) { 1464 return output.release(); 1465 } else { 1466 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1467 oat_path.c_str()); 1468 return nullptr; 1469 } 1470} 1471 1472const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1473 const std::string& output_oat, 1474 const std::string& image_location, 1475 InstructionSet isa, 1476 std::string* error_msg) { 1477 Runtime* runtime = Runtime::Current(); 1478 DCHECK(runtime != nullptr); 1479 if (!runtime->GetHeap()->HasImageSpace()) { 1480 // We don't have an image space so there is no point in trying to patchoat. 1481 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1482 << "running without an image. Attempting to use oat file for interpretation."; 1483 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1484 } 1485 if (!runtime->IsDex2OatEnabled()) { 1486 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1487 // input_oat but make sure we only do interpretation on it's dex files. 1488 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1489 << "disabled. Attempting to use oat file for interpretation"; 1490 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1491 } 1492 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1493 std::string patchoat(runtime->GetPatchoatExecutable()); 1494 1495 std::string isa_arg("--instruction-set="); 1496 isa_arg += GetInstructionSetString(isa); 1497 std::string input_oat_filename_arg("--input-oat-file="); 1498 input_oat_filename_arg += input_oat; 1499 std::string output_oat_filename_arg("--output-oat-file="); 1500 output_oat_filename_arg += output_oat; 1501 std::string patched_image_arg("--patched-image-location="); 1502 patched_image_arg += image_location; 1503 1504 std::vector<std::string> argv; 1505 argv.push_back(patchoat); 1506 argv.push_back(isa_arg); 1507 argv.push_back(input_oat_filename_arg); 1508 argv.push_back(output_oat_filename_arg); 1509 argv.push_back(patched_image_arg); 1510 1511 std::string command_line(Join(argv, ' ')); 1512 LOG(INFO) << "Relocate Oat File: " << command_line; 1513 bool success = Exec(argv, error_msg); 1514 if (success) { 1515 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr, 1516 !runtime->IsCompiler(), error_msg)); 1517 bool checksum_verified = false; 1518 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1519 error_msg)) { 1520 return output.release(); 1521 } else if (output.get() != nullptr) { 1522 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1523 "but output file '%s' failed verifcation: %s", 1524 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1525 } else { 1526 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1527 "but was unable to open output file '%s': %s", 1528 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1529 } 1530 } else if (!runtime->IsCompiler()) { 1531 // patchoat failed which means we probably don't have enough room to place the output oat file, 1532 // instead of failing we should just run the interpreter from the dex files in the input oat. 1533 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1534 << "for interpretation. patchoat failure was: " << *error_msg; 1535 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1536 } else { 1537 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1538 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1539 error_msg->c_str()); 1540 } 1541 return nullptr; 1542} 1543 1544bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1545 bool* checksum_verified, 1546 std::string* error_msg) { 1547 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1548 if (image_space == nullptr) { 1549 *error_msg = "No image space present"; 1550 return false; 1551 } 1552 uint32_t real_image_checksum; 1553 void* real_image_oat_offset; 1554 int32_t real_patch_delta; 1555 if (isa == runtime->GetInstructionSet()) { 1556 const ImageHeader& image_header = image_space->GetImageHeader(); 1557 real_image_checksum = image_header.GetOatChecksum(); 1558 real_image_oat_offset = image_header.GetOatDataBegin(); 1559 real_patch_delta = image_header.GetPatchDelta(); 1560 } else { 1561 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1562 image_space->GetImageLocation().c_str(), isa)); 1563 real_image_checksum = image_header->GetOatChecksum(); 1564 real_image_oat_offset = image_header->GetOatDataBegin(); 1565 real_patch_delta = image_header->GetPatchDelta(); 1566 } 1567 1568 const OatHeader& oat_header = oat_file->GetOatHeader(); 1569 std::string compound_msg; 1570 1571 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1572 *checksum_verified = oat_image_checksum == real_image_checksum; 1573 if (!*checksum_verified) { 1574 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1575 real_image_checksum, oat_image_checksum); 1576 } 1577 1578 bool offset_verified; 1579 bool patch_delta_verified; 1580 1581 if (!oat_file->IsPic()) { 1582 // If an oat file is not PIC, we need to check that the image is at the expected location and 1583 // patched in the same way. 1584 void* oat_image_oat_offset = 1585 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1586 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1587 if (!offset_verified) { 1588 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1589 real_image_oat_offset, oat_image_oat_offset); 1590 } 1591 1592 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1593 patch_delta_verified = oat_patch_delta == real_patch_delta; 1594 if (!patch_delta_verified) { 1595 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, " 1596 "received 0x%x)", real_patch_delta, oat_patch_delta); 1597 } 1598 } else { 1599 // If an oat file is PIC, we ignore offset and patching delta. 1600 offset_verified = true; 1601 patch_delta_verified = true; 1602 } 1603 1604 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1605 if (!ret) { 1606 *error_msg = "Oat file failed to verify:" + compound_msg; 1607 } 1608 return ret; 1609} 1610 1611const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1612 std::string* error_msg) { 1613 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1614 if (oat_file != nullptr) { 1615 return oat_file; 1616 } 1617 1618 return OatFile::Open(oat_location, oat_location, nullptr, nullptr, !Runtime::Current()->IsCompiler(), 1619 error_msg); 1620} 1621 1622void ClassLinker::InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) { 1623 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1624 DCHECK(obj != nullptr); 1625 DCHECK(class_linker != nullptr); 1626 size_t pointer_size = class_linker->image_pointer_size_; 1627 1628 if (obj->IsArtMethod()) { 1629 mirror::ArtMethod* method = obj->AsArtMethod(); 1630 if (!method->IsNative()) { 1631 method->SetEntryPointFromInterpreterPtrSize(artInterpreterToInterpreterBridge, pointer_size); 1632 if (method != Runtime::Current()->GetResolutionMethod()) { 1633 method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(), 1634 pointer_size); 1635 } 1636 } 1637 } 1638} 1639 1640void ClassLinker::InitFromImage() { 1641 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1642 CHECK(!init_done_); 1643 1644 Thread* self = Thread::Current(); 1645 gc::Heap* heap = Runtime::Current()->GetHeap(); 1646 gc::space::ImageSpace* space = heap->GetImageSpace(); 1647 dex_cache_image_class_lookup_required_ = true; 1648 CHECK(space != nullptr); 1649 OatFile& oat_file = GetImageOatFile(space); 1650 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1651 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1652 const char* image_file_location = oat_file.GetOatHeader(). 1653 GetStoreValueByKey(OatHeader::kImageLocationKey); 1654 CHECK(image_file_location == nullptr || *image_file_location == 0); 1655 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1656 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1657 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1658 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1659 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1660 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1661 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1662 1663 StackHandleScope<1> hs(self); 1664 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1665 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1666 AsObjectArray<mirror::Class>())); 1667 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1668 1669 // Special case of setting up the String class early so that we can test arbitrary objects 1670 // as being Strings or not 1671 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1672 1673 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1674 static_cast<uint32_t>(dex_caches->GetLength())); 1675 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1676 StackHandleScope<1> hs2(self); 1677 Handle<mirror::DexCache> dex_cache(hs2.NewHandle(dex_caches->Get(i))); 1678 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1679 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1680 nullptr); 1681 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1682 std::string error_msg; 1683 std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg); 1684 if (dex_file.get() == nullptr) { 1685 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1686 << " from within oat file " << oat_file.GetLocation() 1687 << " error '" << error_msg << "'"; 1688 UNREACHABLE(); 1689 } 1690 1691 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1692 1693 AppendToBootClassPath(*dex_file.get(), dex_cache); 1694 opened_dex_files_.push_back(std::move(dex_file)); 1695 } 1696 1697 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1698 // bitmap walk. 1699 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1700 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 1701 if (!Runtime::Current()->IsCompiler()) { 1702 // Compiler supports having an image with a different pointer size than the runtime. This 1703 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 1704 // also use 32 bit dex2oat on a system with 64 bit apps. 1705 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 1706 << sizeof(void*); 1707 } 1708 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 1709 image_pointer_size_ = 4; 1710 } else { 1711 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 1712 image_pointer_size_ = 8; 1713 } 1714 1715 // Set entry point to interpreter if in InterpretOnly mode. 1716 Runtime* runtime = Runtime::Current(); 1717 if (!runtime->IsCompiler() && runtime->GetInstrumentation()->InterpretOnly()) { 1718 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1719 } 1720 1721 // reinit class_roots_ 1722 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1723 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1724 1725 // reinit array_iftable_ from any array class instance, they should be == 1726 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1727 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1728 // String class root was set above 1729 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1730 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1731 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1732 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1733 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1734 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1735 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1736 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1737 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1738 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1739 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1740 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1741 1742 FinishInit(self); 1743 1744 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1745} 1746 1747void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1748 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1749 if ((flags & kVisitRootFlagAllRoots) != 0) { 1750 for (GcRoot<mirror::Class>& root : class_table_) { 1751 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1752 } 1753 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1754 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1755 } 1756 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1757 for (auto& root : new_class_roots_) { 1758 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 1759 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1760 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 1761 if (UNLIKELY(new_ref != old_ref)) { 1762 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1763 // corresponding object. This is slow, but luckily for us, this may only happen with a 1764 // concurrent moving GC. 1765 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 1766 DCHECK(it != class_table_.end()); 1767 *it = GcRoot<mirror::Class>(new_ref); 1768 } 1769 } 1770 } 1771 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1772 new_class_roots_.clear(); 1773 } 1774 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1775 log_new_class_table_roots_ = true; 1776 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1777 log_new_class_table_roots_ = false; 1778 } 1779 // We deliberately ignore the class roots in the image since we 1780 // handle image roots by using the MS/CMS rescanning of dirty cards. 1781} 1782 1783// Keep in sync with InitCallback. Anything we visit, we need to 1784// reinit references to when reinitializing a ClassLinker from a 1785// mapped image. 1786void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1787 class_roots_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1788 Thread* self = Thread::Current(); 1789 { 1790 ReaderMutexLock mu(self, dex_lock_); 1791 if ((flags & kVisitRootFlagAllRoots) != 0) { 1792 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1793 dex_cache.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1794 } 1795 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1796 for (size_t index : new_dex_cache_roots_) { 1797 dex_caches_[index].VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1798 } 1799 } 1800 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1801 new_dex_cache_roots_.clear(); 1802 } 1803 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1804 log_new_dex_caches_roots_ = true; 1805 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1806 log_new_dex_caches_roots_ = false; 1807 } 1808 } 1809 VisitClassRoots(callback, arg, flags); 1810 array_iftable_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1811 DCHECK(!array_iftable_.IsNull()); 1812 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1813 find_array_class_cache_[i].VisitRootIfNonNull(callback, arg, RootInfo(kRootVMInternal)); 1814 } 1815} 1816 1817void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1818 if (dex_cache_image_class_lookup_required_) { 1819 MoveImageClassesToClassTable(); 1820 } 1821 // TODO: why isn't this a ReaderMutexLock? 1822 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1823 for (GcRoot<mirror::Class>& root : class_table_) { 1824 if (!visitor(root.Read(), arg)) { 1825 return; 1826 } 1827 } 1828 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1829 if (!visitor(root.Read(), arg)) { 1830 return; 1831 } 1832 } 1833} 1834 1835static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1836 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1837 classes->insert(c); 1838 return true; 1839} 1840 1841struct GetClassesVisitorArrayArg { 1842 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1843 int32_t index; 1844 bool success; 1845}; 1846 1847static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1848 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1849 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1850 if (arg->index < (*arg->classes)->GetLength()) { 1851 (*arg->classes)->Set(arg->index, c); 1852 arg->index++; 1853 return true; 1854 } else { 1855 arg->success = false; 1856 return false; 1857 } 1858} 1859 1860void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1861 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1862 // is avoiding duplicates. 1863 if (!kMovingClasses) { 1864 std::set<mirror::Class*> classes; 1865 VisitClasses(GetClassesVisitorSet, &classes); 1866 for (mirror::Class* klass : classes) { 1867 if (!visitor(klass, arg)) { 1868 return; 1869 } 1870 } 1871 } else { 1872 Thread* self = Thread::Current(); 1873 StackHandleScope<1> hs(self); 1874 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1875 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1876 GetClassesVisitorArrayArg local_arg; 1877 local_arg.classes = &classes; 1878 local_arg.success = false; 1879 // We size the array assuming classes won't be added to the class table during the visit. 1880 // If this assumption fails we iterate again. 1881 while (!local_arg.success) { 1882 size_t class_table_size; 1883 { 1884 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1885 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1886 } 1887 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1888 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1889 classes.Assign( 1890 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1891 CHECK(classes.Get() != nullptr); // OOME. 1892 local_arg.index = 0; 1893 local_arg.success = true; 1894 VisitClasses(GetClassesVisitorArray, &local_arg); 1895 } 1896 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1897 // If the class table shrank during creation of the clases array we expect null elements. If 1898 // the class table grew then the loop repeats. If classes are created after the loop has 1899 // finished then we don't visit. 1900 mirror::Class* klass = classes->Get(i); 1901 if (klass != nullptr && !visitor(klass, arg)) { 1902 return; 1903 } 1904 } 1905 } 1906} 1907 1908ClassLinker::~ClassLinker() { 1909 mirror::Class::ResetClass(); 1910 mirror::String::ResetClass(); 1911 mirror::Reference::ResetClass(); 1912 mirror::ArtField::ResetClass(); 1913 mirror::ArtMethod::ResetClass(); 1914 mirror::BooleanArray::ResetArrayClass(); 1915 mirror::ByteArray::ResetArrayClass(); 1916 mirror::CharArray::ResetArrayClass(); 1917 mirror::DoubleArray::ResetArrayClass(); 1918 mirror::FloatArray::ResetArrayClass(); 1919 mirror::IntArray::ResetArrayClass(); 1920 mirror::LongArray::ResetArrayClass(); 1921 mirror::ShortArray::ResetArrayClass(); 1922 mirror::Throwable::ResetClass(); 1923 mirror::StackTraceElement::ResetClass(); 1924 STLDeleteElements(&oat_files_); 1925} 1926 1927mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1928 gc::Heap* heap = Runtime::Current()->GetHeap(); 1929 StackHandleScope<16> hs(self); 1930 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1931 Handle<mirror::DexCache> dex_cache( 1932 hs.NewHandle(down_cast<mirror::DexCache*>( 1933 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1934 VoidFunctor())))); 1935 if (dex_cache.Get() == nullptr) { 1936 return nullptr; 1937 } 1938 Handle<mirror::String> 1939 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1940 if (location.Get() == nullptr) { 1941 return nullptr; 1942 } 1943 Handle<mirror::ObjectArray<mirror::String>> 1944 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1945 if (strings.Get() == nullptr) { 1946 return nullptr; 1947 } 1948 Handle<mirror::ObjectArray<mirror::Class>> 1949 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1950 if (types.Get() == nullptr) { 1951 return nullptr; 1952 } 1953 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1954 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1955 if (methods.Get() == nullptr) { 1956 return nullptr; 1957 } 1958 Handle<mirror::ObjectArray<mirror::ArtField>> 1959 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1960 if (fields.Get() == nullptr) { 1961 return nullptr; 1962 } 1963 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1964 fields.Get()); 1965 return dex_cache.Get(); 1966} 1967 1968mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1969 uint32_t class_size) { 1970 DCHECK_GE(class_size, sizeof(mirror::Class)); 1971 gc::Heap* heap = Runtime::Current()->GetHeap(); 1972 mirror::Class::InitializeClassVisitor visitor(class_size); 1973 mirror::Object* k = kMovingClasses ? 1974 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1975 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1976 if (UNLIKELY(k == nullptr)) { 1977 CHECK(self->IsExceptionPending()); // OOME. 1978 return nullptr; 1979 } 1980 return k->AsClass(); 1981} 1982 1983mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1984 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1985} 1986 1987mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1988 return down_cast<mirror::ArtField*>( 1989 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1990} 1991 1992mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1993 return down_cast<mirror::ArtMethod*>( 1994 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1995} 1996 1997mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1998 Thread* self, size_t length) { 1999 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 2000 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 2001} 2002 2003mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2004 mirror::Class* klass) { 2005 DCHECK(klass != nullptr); 2006 2007 // For temporary classes we must wait for them to be retired. 2008 if (init_done_ && klass->IsTemp()) { 2009 CHECK(!klass->IsResolved()); 2010 if (klass->IsErroneous()) { 2011 ThrowEarlierClassFailure(klass); 2012 return nullptr; 2013 } 2014 StackHandleScope<1> hs(self); 2015 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2016 ObjectLock<mirror::Class> lock(self, h_class); 2017 // Loop and wait for the resolving thread to retire this class. 2018 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2019 lock.WaitIgnoringInterrupts(); 2020 } 2021 if (h_class->IsErroneous()) { 2022 ThrowEarlierClassFailure(h_class.Get()); 2023 return nullptr; 2024 } 2025 CHECK(h_class->IsRetired()); 2026 // Get the updated class from class table. 2027 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor), 2028 h_class.Get()->GetClassLoader()); 2029 } 2030 2031 // Wait for the class if it has not already been linked. 2032 if (!klass->IsResolved() && !klass->IsErroneous()) { 2033 StackHandleScope<1> hs(self); 2034 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2035 ObjectLock<mirror::Class> lock(self, h_class); 2036 // Check for circular dependencies between classes. 2037 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2038 ThrowClassCircularityError(h_class.Get()); 2039 h_class->SetStatus(mirror::Class::kStatusError, self); 2040 return nullptr; 2041 } 2042 // Wait for the pending initialization to complete. 2043 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2044 lock.WaitIgnoringInterrupts(); 2045 } 2046 } 2047 2048 if (klass->IsErroneous()) { 2049 ThrowEarlierClassFailure(klass); 2050 return nullptr; 2051 } 2052 // Return the loaded class. No exceptions should be pending. 2053 CHECK(klass->IsResolved()) << PrettyClass(klass); 2054 self->AssertNoPendingException(); 2055 return klass; 2056} 2057 2058typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2059 2060// Search a collection of DexFiles for a descriptor 2061ClassPathEntry FindInClassPath(const char* descriptor, 2062 size_t hash, const std::vector<const DexFile*>& class_path) { 2063 for (const DexFile* dex_file : class_path) { 2064 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2065 if (dex_class_def != nullptr) { 2066 return ClassPathEntry(dex_file, dex_class_def); 2067 } 2068 } 2069 return ClassPathEntry(nullptr, nullptr); 2070} 2071 2072mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2073 Thread* self, const char* descriptor, 2074 size_t hash, 2075 Handle<mirror::ClassLoader> class_loader) { 2076 // Can we special case for a well understood PathClassLoader with the BootClassLoader as parent? 2077 if (class_loader->GetClass() != 2078 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2079 class_loader->GetParent()->GetClass() != 2080 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2081 return nullptr; 2082 } 2083 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2084 // Check if this would be found in the parent boot class loader. 2085 if (pair.second != nullptr) { 2086 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr); 2087 if (klass != nullptr) { 2088 // May return null if resolution on another thread fails. 2089 klass = EnsureResolved(self, descriptor, klass); 2090 } else { 2091 // May OOME. 2092 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2093 *pair.second); 2094 } 2095 if (klass == nullptr) { 2096 CHECK(self->IsExceptionPending()) << descriptor; 2097 self->ClearException(); 2098 } 2099 return klass; 2100 } else { 2101 // Handle as if this is the child PathClassLoader. 2102 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension). 2103 StackHandleScope<3> hs(self); 2104 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2105 // We need to get the DexPathList and loop through it. 2106 Handle<mirror::ArtField> cookie_field = 2107 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2108 Handle<mirror::ArtField> dex_file_field = 2109 hs.NewHandle( 2110 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2111 mirror::Object* dex_path_list = 2112 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2113 GetObject(class_loader.Get()); 2114 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2115 cookie_field.Get() != nullptr) { 2116 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2117 mirror::Object* dex_elements_obj = 2118 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2119 GetObject(dex_path_list); 2120 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2121 // at the mCookie which is a DexFile vector. 2122 if (dex_elements_obj != nullptr) { 2123 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2124 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2125 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2126 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2127 if (element == nullptr) { 2128 // Should never happen, fall back to java code to throw a NPE. 2129 break; 2130 } 2131 mirror::Object* dex_file = dex_file_field->GetObject(element); 2132 if (dex_file != nullptr) { 2133 const uint64_t cookie = cookie_field->GetLong(dex_file); 2134 auto* dex_files = 2135 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2136 if (dex_files == nullptr) { 2137 // This should never happen so log a warning. 2138 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2139 break; 2140 } 2141 for (const DexFile* cp_dex_file : *dex_files) { 2142 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash); 2143 if (dex_class_def != nullptr) { 2144 RegisterDexFile(*cp_dex_file); 2145 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, 2146 *cp_dex_file, *dex_class_def); 2147 if (klass == nullptr) { 2148 CHECK(self->IsExceptionPending()) << descriptor; 2149 self->ClearException(); 2150 return nullptr; 2151 } 2152 return klass; 2153 } 2154 } 2155 } 2156 } 2157 } 2158 } 2159 self->AssertNoPendingException(); 2160 return nullptr; 2161 } 2162} 2163 2164mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2165 Handle<mirror::ClassLoader> class_loader) { 2166 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2167 DCHECK(self != nullptr); 2168 self->AssertNoPendingException(); 2169 if (descriptor[1] == '\0') { 2170 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2171 // for primitive classes that aren't backed by dex files. 2172 return FindPrimitiveClass(descriptor[0]); 2173 } 2174 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 2175 // Find the class in the loaded classes table. 2176 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get()); 2177 if (klass != nullptr) { 2178 return EnsureResolved(self, descriptor, klass); 2179 } 2180 // Class is not yet loaded. 2181 if (descriptor[0] == '[') { 2182 return CreateArrayClass(self, descriptor, hash, class_loader); 2183 } else if (class_loader.Get() == nullptr) { 2184 // The boot class loader, search the boot class path. 2185 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2186 if (pair.second != nullptr) { 2187 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2188 *pair.second); 2189 } else { 2190 // The boot class loader is searched ahead of the application class loader, failures are 2191 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2192 // trigger the chaining with a proper stack trace. 2193 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2194 self->SetException(ThrowLocation(), pre_allocated); 2195 return nullptr; 2196 } 2197 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2198 // First try with the bootstrap class loader. 2199 if (class_loader.Get() != nullptr) { 2200 klass = LookupClass(self, descriptor, hash, nullptr); 2201 if (klass != nullptr) { 2202 return EnsureResolved(self, descriptor, klass); 2203 } 2204 } 2205 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2206 // a NoClassDefFoundError being allocated. 2207 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2208 if (pair.second != nullptr) { 2209 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2210 *pair.second); 2211 } 2212 // Next try the compile time class path. 2213 const std::vector<const DexFile*>* class_path; 2214 { 2215 ScopedObjectAccessUnchecked soa(self); 2216 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2217 soa.AddLocalReference<jobject>(class_loader.Get())); 2218 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2219 } 2220 pair = FindInClassPath(descriptor, hash, *class_path); 2221 if (pair.second != nullptr) { 2222 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 2223 } else { 2224 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2225 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2226 self->SetException(ThrowLocation(), pre_allocated); 2227 return nullptr; 2228 } 2229 } else { 2230 ScopedObjectAccessUnchecked soa(self); 2231 mirror::Class* cp_klass = FindClassInPathClassLoader(soa, self, descriptor, hash, 2232 class_loader); 2233 if (cp_klass != nullptr) { 2234 return cp_klass; 2235 } 2236 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2237 soa.AddLocalReference<jobject>(class_loader.Get())); 2238 std::string class_name_string(DescriptorToDot(descriptor)); 2239 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2240 { 2241 ScopedThreadStateChange tsc(self, kNative); 2242 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2243 soa.Env()->NewStringUTF(class_name_string.c_str())); 2244 if (class_name_object.get() == nullptr) { 2245 DCHECK(self->IsExceptionPending()); // OOME. 2246 return nullptr; 2247 } 2248 CHECK(class_loader_object.get() != nullptr); 2249 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2250 WellKnownClasses::java_lang_ClassLoader_loadClass, 2251 class_name_object.get())); 2252 } 2253 if (self->IsExceptionPending()) { 2254 // If the ClassLoader threw, pass that exception up. 2255 return nullptr; 2256 } else if (result.get() == nullptr) { 2257 // broken loader - throw NPE to be compatible with Dalvik 2258 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2259 class_name_string.c_str()).c_str()); 2260 return nullptr; 2261 } else { 2262 // success, return mirror::Class* 2263 return soa.Decode<mirror::Class*>(result.get()); 2264 } 2265 } 2266 UNREACHABLE(); 2267} 2268 2269mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 2270 Handle<mirror::ClassLoader> class_loader, 2271 const DexFile& dex_file, 2272 const DexFile::ClassDef& dex_class_def) { 2273 StackHandleScope<3> hs(self); 2274 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2275 2276 // Load the class from the dex file. 2277 if (UNLIKELY(!init_done_)) { 2278 // finish up init of hand crafted class_roots_ 2279 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2280 klass.Assign(GetClassRoot(kJavaLangObject)); 2281 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2282 klass.Assign(GetClassRoot(kJavaLangClass)); 2283 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2284 klass.Assign(GetClassRoot(kJavaLangString)); 2285 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2286 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2287 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2288 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2289 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2290 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2291 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2292 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2293 } 2294 } 2295 2296 if (klass.Get() == nullptr) { 2297 // Allocate a class with the status of not ready. 2298 // Interface object should get the right size here. Regular class will 2299 // figure out the right size later and be replaced with one of the right 2300 // size when the class becomes resolved. 2301 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2302 } 2303 if (UNLIKELY(klass.Get() == nullptr)) { 2304 CHECK(self->IsExceptionPending()); // Expect an OOME. 2305 return nullptr; 2306 } 2307 klass->SetDexCache(FindDexCache(dex_file)); 2308 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2309 ObjectLock<mirror::Class> lock(self, klass); 2310 if (self->IsExceptionPending()) { 2311 // An exception occured during load, set status to erroneous while holding klass' lock in case 2312 // notification is necessary. 2313 if (!klass->IsErroneous()) { 2314 klass->SetStatus(mirror::Class::kStatusError, self); 2315 } 2316 return nullptr; 2317 } 2318 klass->SetClinitThreadId(self->GetTid()); 2319 2320 // Add the newly loaded class to the loaded classes table. 2321 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 2322 if (existing != nullptr) { 2323 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2324 // this thread to block. 2325 return EnsureResolved(self, descriptor, existing); 2326 } 2327 2328 // Finish loading (if necessary) by finding parents 2329 CHECK(!klass->IsLoaded()); 2330 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2331 // Loading failed. 2332 if (!klass->IsErroneous()) { 2333 klass->SetStatus(mirror::Class::kStatusError, self); 2334 } 2335 return nullptr; 2336 } 2337 CHECK(klass->IsLoaded()); 2338 // Link the class (if necessary) 2339 CHECK(!klass->IsResolved()); 2340 // TODO: Use fast jobjects? 2341 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2342 2343 mirror::Class* new_class = nullptr; 2344 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2345 // Linking failed. 2346 if (!klass->IsErroneous()) { 2347 klass->SetStatus(mirror::Class::kStatusError, self); 2348 } 2349 return nullptr; 2350 } 2351 self->AssertNoPendingException(); 2352 CHECK(new_class != nullptr) << descriptor; 2353 CHECK(new_class->IsResolved()) << descriptor; 2354 2355 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2356 2357 // Instrumentation may have updated entrypoints for all methods of all 2358 // classes. However it could not update methods of this class while we 2359 // were loading it. Now the class is resolved, we can update entrypoints 2360 // as required by instrumentation. 2361 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 2362 // We must be in the kRunnable state to prevent instrumentation from 2363 // suspending all threads to update entrypoints while we are doing it 2364 // for this class. 2365 DCHECK_EQ(self->GetState(), kRunnable); 2366 Runtime::Current()->GetInstrumentation()->InstallStubsForClass(new_class_h.Get()); 2367 } 2368 2369 /* 2370 * We send CLASS_PREPARE events to the debugger from here. The 2371 * definition of "preparation" is creating the static fields for a 2372 * class and initializing them to the standard default values, but not 2373 * executing any code (that comes later, during "initialization"). 2374 * 2375 * We did the static preparation in LinkClass. 2376 * 2377 * The class has been prepared and resolved but possibly not yet verified 2378 * at this point. 2379 */ 2380 Dbg::PostClassPrepare(new_class_h.Get()); 2381 2382 return new_class_h.Get(); 2383} 2384 2385uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2386 const DexFile::ClassDef& dex_class_def) { 2387 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2388 size_t num_ref = 0; 2389 size_t num_8 = 0; 2390 size_t num_16 = 0; 2391 size_t num_32 = 0; 2392 size_t num_64 = 0; 2393 if (class_data != nullptr) { 2394 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2395 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2396 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2397 char c = descriptor[0]; 2398 switch (c) { 2399 case 'L': 2400 case '[': 2401 num_ref++; 2402 break; 2403 case 'J': 2404 case 'D': 2405 num_64++; 2406 break; 2407 case 'I': 2408 case 'F': 2409 num_32++; 2410 break; 2411 case 'S': 2412 case 'C': 2413 num_16++; 2414 break; 2415 case 'B': 2416 case 'Z': 2417 num_8++; 2418 break; 2419 default: 2420 LOG(FATAL) << "Unknown descriptor: " << c; 2421 UNREACHABLE(); 2422 } 2423 } 2424 } 2425 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2426} 2427 2428OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2429 bool* found) { 2430 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2431 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2432 if (oat_dex_file == nullptr) { 2433 *found = false; 2434 return OatFile::OatClass::Invalid(); 2435 } 2436 *found = true; 2437 return oat_dex_file->GetOatClass(class_def_idx); 2438} 2439 2440static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2441 uint32_t method_idx) { 2442 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2443 const uint8_t* class_data = dex_file.GetClassData(class_def); 2444 CHECK(class_data != nullptr); 2445 ClassDataItemIterator it(dex_file, class_data); 2446 // Skip fields 2447 while (it.HasNextStaticField()) { 2448 it.Next(); 2449 } 2450 while (it.HasNextInstanceField()) { 2451 it.Next(); 2452 } 2453 // Process methods 2454 size_t class_def_method_index = 0; 2455 while (it.HasNextDirectMethod()) { 2456 if (it.GetMemberIndex() == method_idx) { 2457 return class_def_method_index; 2458 } 2459 class_def_method_index++; 2460 it.Next(); 2461 } 2462 while (it.HasNextVirtualMethod()) { 2463 if (it.GetMemberIndex() == method_idx) { 2464 return class_def_method_index; 2465 } 2466 class_def_method_index++; 2467 it.Next(); 2468 } 2469 DCHECK(!it.HasNext()); 2470 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2471 UNREACHABLE(); 2472} 2473 2474const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2475 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2476 // method for direct methods (or virtual methods made direct). 2477 mirror::Class* declaring_class = method->GetDeclaringClass(); 2478 size_t oat_method_index; 2479 if (method->IsStatic() || method->IsDirect()) { 2480 // Simple case where the oat method index was stashed at load time. 2481 oat_method_index = method->GetMethodIndex(); 2482 } else { 2483 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2484 // by search for its position in the declared virtual methods. 2485 oat_method_index = declaring_class->NumDirectMethods(); 2486 size_t end = declaring_class->NumVirtualMethods(); 2487 bool found_virtual = false; 2488 for (size_t i = 0; i < end; i++) { 2489 // Check method index instead of identity in case of duplicate method definitions. 2490 if (method->GetDexMethodIndex() == 2491 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2492 found_virtual = true; 2493 break; 2494 } 2495 oat_method_index++; 2496 } 2497 CHECK(found_virtual) << "Didn't find oat method index for virtual method: " 2498 << PrettyMethod(method); 2499 } 2500 DCHECK_EQ(oat_method_index, 2501 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2502 method->GetDeclaringClass()->GetDexClassDefIndex(), 2503 method->GetDexMethodIndex())); 2504 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2505 declaring_class->GetDexClassDefIndex(), 2506 found); 2507 if (!(*found)) { 2508 return OatFile::OatMethod::Invalid(); 2509 } 2510 return oat_class.GetOatMethod(oat_method_index); 2511} 2512 2513// Special case to get oat code without overwriting a trampoline. 2514const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2515 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2516 if (method->IsProxyMethod()) { 2517 return GetQuickProxyInvokeHandler(); 2518 } 2519 bool found; 2520 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2521 const void* result = nullptr; 2522 if (found) { 2523 result = oat_method.GetQuickCode(); 2524 } 2525 2526 if (result == nullptr) { 2527 if (method->IsNative()) { 2528 // No code and native? Use generic trampoline. 2529 result = GetQuickGenericJniStub(); 2530 } else { 2531 // No code? You must mean to go into the interpreter. 2532 result = GetQuickToInterpreterBridge(); 2533 } 2534 } 2535 return result; 2536} 2537 2538const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2539 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2540 return nullptr; 2541 } 2542 bool found; 2543 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2544 return found ? oat_method.GetQuickCode() : nullptr; 2545} 2546 2547const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2548 uint32_t method_idx) { 2549 bool found; 2550 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2551 if (!found) { 2552 return nullptr; 2553 } 2554 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2555 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2556} 2557 2558// Returns true if the method must run with interpreter, false otherwise. 2559static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code) 2560 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2561 if (quick_code == nullptr) { 2562 // No code: need interpreter. 2563 // May return true for native code, in the case of generic JNI 2564 // DCHECK(!method->IsNative()); 2565 return true; 2566 } 2567 // If interpreter mode is enabled, every method (except native and proxy) must 2568 // be run with interpreter. 2569 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2570 !method->IsNative() && !method->IsProxyMethod(); 2571} 2572 2573void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2574 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2575 if (klass->NumDirectMethods() == 0) { 2576 return; // No direct methods => no static methods. 2577 } 2578 Runtime* runtime = Runtime::Current(); 2579 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2580 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2581 return; // OAT file unavailable. 2582 } 2583 } 2584 2585 const DexFile& dex_file = klass->GetDexFile(); 2586 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2587 CHECK(dex_class_def != nullptr); 2588 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2589 // There should always be class data if there were direct methods. 2590 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2591 ClassDataItemIterator it(dex_file, class_data); 2592 // Skip fields 2593 while (it.HasNextStaticField()) { 2594 it.Next(); 2595 } 2596 while (it.HasNextInstanceField()) { 2597 it.Next(); 2598 } 2599 bool has_oat_class; 2600 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2601 &has_oat_class); 2602 // Link the code of methods skipped by LinkCode. 2603 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2604 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2605 if (!method->IsStatic()) { 2606 // Only update static methods. 2607 continue; 2608 } 2609 const void* quick_code = nullptr; 2610 if (has_oat_class) { 2611 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2612 quick_code = oat_method.GetQuickCode(); 2613 } 2614 const bool enter_interpreter = NeedsInterpreter(method, quick_code); 2615 if (enter_interpreter) { 2616 // Use interpreter entry point. 2617 // Check whether the method is native, in which case it's generic JNI. 2618 if (quick_code == nullptr && method->IsNative()) { 2619 quick_code = GetQuickGenericJniStub(); 2620 } else { 2621 quick_code = GetQuickToInterpreterBridge(); 2622 } 2623 } 2624 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code); 2625 } 2626 // Ignore virtual methods on the iterator. 2627} 2628 2629void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2630 const OatFile::OatClass* oat_class, 2631 uint32_t class_def_method_index) { 2632 Runtime* runtime = Runtime::Current(); 2633 if (runtime->IsCompiler()) { 2634 // The following code only applies to a non-compiler runtime. 2635 return; 2636 } 2637 // Method shouldn't have already been linked. 2638 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2639 if (oat_class != nullptr) { 2640 // Every kind of method should at least get an invoke stub from the oat_method. 2641 // non-abstract methods also get their code pointers. 2642 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index); 2643 oat_method.LinkMethod(method.Get()); 2644 } 2645 2646 // Install entry point from interpreter. 2647 bool enter_interpreter = NeedsInterpreter(method.Get(), 2648 method->GetEntryPointFromQuickCompiledCode()); 2649 if (enter_interpreter && !method->IsNative()) { 2650 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2651 } else { 2652 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2653 } 2654 2655 if (method->IsAbstract()) { 2656 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2657 return; 2658 } 2659 2660 if (method->IsStatic() && !method->IsConstructor()) { 2661 // For static methods excluding the class initializer, install the trampoline. 2662 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2663 // after initializing class (see ClassLinker::InitializeClass method). 2664 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2665 } else if (enter_interpreter) { 2666 if (!method->IsNative()) { 2667 // Set entry point from compiled code if there's no code or in interpreter only mode. 2668 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2669 } else { 2670 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2671 } 2672 } 2673 2674 if (method->IsNative()) { 2675 // Unregistering restores the dlsym lookup stub. 2676 method->UnregisterNative(); 2677 2678 if (enter_interpreter) { 2679 // We have a native method here without code. Then it should have either the generic JNI 2680 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2681 // TODO: this doesn't handle all the cases where trampolines may be installed. 2682 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2683 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2684 } 2685 } 2686} 2687 2688 2689 2690void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2691 const DexFile::ClassDef& dex_class_def, 2692 Handle<mirror::Class> klass, 2693 mirror::ClassLoader* class_loader) { 2694 CHECK(klass.Get() != nullptr); 2695 CHECK(klass->GetDexCache() != nullptr); 2696 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2697 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2698 CHECK(descriptor != nullptr); 2699 2700 klass->SetClass(GetClassRoot(kJavaLangClass)); 2701 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2702 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2703 klass->SetAccessFlags(access_flags); 2704 klass->SetClassLoader(class_loader); 2705 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2706 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2707 2708 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2709 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2710 CHECK(klass->GetDexCacheStrings() != nullptr); 2711 2712 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2713 if (class_data == nullptr) { 2714 return; // no fields or methods - for example a marker interface 2715 } 2716 2717 2718 bool has_oat_class = false; 2719 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2720 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2721 &has_oat_class); 2722 if (has_oat_class) { 2723 LoadClassMembers(self, dex_file, class_data, klass, &oat_class); 2724 } 2725 } 2726 if (!has_oat_class) { 2727 LoadClassMembers(self, dex_file, class_data, klass, nullptr); 2728 } 2729} 2730 2731void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2732 const uint8_t* class_data, 2733 Handle<mirror::Class> klass, 2734 const OatFile::OatClass* oat_class) { 2735 // Load fields. 2736 ClassDataItemIterator it(dex_file, class_data); 2737 if (it.NumStaticFields() != 0) { 2738 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2739 if (UNLIKELY(statics == nullptr)) { 2740 CHECK(self->IsExceptionPending()); // OOME. 2741 return; 2742 } 2743 klass->SetSFields(statics); 2744 } 2745 if (it.NumInstanceFields() != 0) { 2746 mirror::ObjectArray<mirror::ArtField>* fields = 2747 AllocArtFieldArray(self, it.NumInstanceFields()); 2748 if (UNLIKELY(fields == nullptr)) { 2749 CHECK(self->IsExceptionPending()); // OOME. 2750 return; 2751 } 2752 klass->SetIFields(fields); 2753 } 2754 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2755 self->AllowThreadSuspension(); 2756 StackHandleScope<1> hs(self); 2757 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2758 if (UNLIKELY(sfield.Get() == nullptr)) { 2759 CHECK(self->IsExceptionPending()); // OOME. 2760 return; 2761 } 2762 klass->SetStaticField(i, sfield.Get()); 2763 LoadField(dex_file, it, klass, sfield); 2764 } 2765 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2766 self->AllowThreadSuspension(); 2767 StackHandleScope<1> hs(self); 2768 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2769 if (UNLIKELY(ifield.Get() == nullptr)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return; 2772 } 2773 klass->SetInstanceField(i, ifield.Get()); 2774 LoadField(dex_file, it, klass, ifield); 2775 } 2776 2777 // Load methods. 2778 if (it.NumDirectMethods() != 0) { 2779 // TODO: append direct methods to class object 2780 mirror::ObjectArray<mirror::ArtMethod>* directs = 2781 AllocArtMethodArray(self, it.NumDirectMethods()); 2782 if (UNLIKELY(directs == nullptr)) { 2783 CHECK(self->IsExceptionPending()); // OOME. 2784 return; 2785 } 2786 klass->SetDirectMethods(directs); 2787 } 2788 if (it.NumVirtualMethods() != 0) { 2789 // TODO: append direct methods to class object 2790 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2791 AllocArtMethodArray(self, it.NumVirtualMethods()); 2792 if (UNLIKELY(virtuals == nullptr)) { 2793 CHECK(self->IsExceptionPending()); // OOME. 2794 return; 2795 } 2796 klass->SetVirtualMethods(virtuals); 2797 } 2798 size_t class_def_method_index = 0; 2799 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2800 size_t last_class_def_method_index = 0; 2801 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2802 self->AllowThreadSuspension(); 2803 StackHandleScope<1> hs(self); 2804 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2805 if (UNLIKELY(method.Get() == nullptr)) { 2806 CHECK(self->IsExceptionPending()); // OOME. 2807 return; 2808 } 2809 klass->SetDirectMethod(i, method.Get()); 2810 LinkCode(method, oat_class, class_def_method_index); 2811 uint32_t it_method_index = it.GetMemberIndex(); 2812 if (last_dex_method_index == it_method_index) { 2813 // duplicate case 2814 method->SetMethodIndex(last_class_def_method_index); 2815 } else { 2816 method->SetMethodIndex(class_def_method_index); 2817 last_dex_method_index = it_method_index; 2818 last_class_def_method_index = class_def_method_index; 2819 } 2820 class_def_method_index++; 2821 } 2822 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2823 self->AllowThreadSuspension(); 2824 StackHandleScope<1> hs(self); 2825 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2826 if (UNLIKELY(method.Get() == nullptr)) { 2827 CHECK(self->IsExceptionPending()); // OOME. 2828 return; 2829 } 2830 klass->SetVirtualMethod(i, method.Get()); 2831 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2832 LinkCode(method, oat_class, class_def_method_index); 2833 class_def_method_index++; 2834 } 2835 DCHECK(!it.HasNext()); 2836} 2837 2838void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2839 Handle<mirror::Class> klass, 2840 Handle<mirror::ArtField> dst) { 2841 uint32_t field_idx = it.GetMemberIndex(); 2842 dst->SetDexFieldIndex(field_idx); 2843 dst->SetDeclaringClass(klass.Get()); 2844 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2845} 2846 2847mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2848 const ClassDataItemIterator& it, 2849 Handle<mirror::Class> klass) { 2850 uint32_t dex_method_idx = it.GetMemberIndex(); 2851 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2852 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2853 2854 mirror::ArtMethod* dst = AllocArtMethod(self); 2855 if (UNLIKELY(dst == nullptr)) { 2856 CHECK(self->IsExceptionPending()); // OOME. 2857 return nullptr; 2858 } 2859 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2860 2861 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2862 dst->SetDexMethodIndex(dex_method_idx); 2863 dst->SetDeclaringClass(klass.Get()); 2864 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2865 2866 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2867 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2868 2869 uint32_t access_flags = it.GetMethodAccessFlags(); 2870 2871 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2872 // Set finalizable flag on declaring class. 2873 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2874 // Void return type. 2875 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2876 klass->SetFinalizable(); 2877 } else { 2878 std::string temp; 2879 const char* klass_descriptor = klass->GetDescriptor(&temp); 2880 // The Enum class declares a "final" finalize() method to prevent subclasses from 2881 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2882 // subclasses, so we exclude it here. 2883 // We also want to avoid setting the flag on Object, where we know that finalize() is 2884 // empty. 2885 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2886 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2887 klass->SetFinalizable(); 2888 } 2889 } 2890 } 2891 } else if (method_name[0] == '<') { 2892 // Fix broken access flags for initializers. Bug 11157540. 2893 bool is_init = (strcmp("<init>", method_name) == 0); 2894 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2895 if (UNLIKELY(!is_init && !is_clinit)) { 2896 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2897 } else { 2898 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2899 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2900 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2901 access_flags |= kAccConstructor; 2902 } 2903 } 2904 } 2905 dst->SetAccessFlags(access_flags); 2906 2907 return dst; 2908} 2909 2910void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2911 StackHandleScope<1> hs(self); 2912 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2913 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2914 << dex_file.GetLocation(); 2915 AppendToBootClassPath(dex_file, dex_cache); 2916} 2917 2918void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2919 Handle<mirror::DexCache> dex_cache) { 2920 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2921 boot_class_path_.push_back(&dex_file); 2922 RegisterDexFile(dex_file, dex_cache); 2923} 2924 2925bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2926 dex_lock_.AssertSharedHeld(Thread::Current()); 2927 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2928 mirror::DexCache* dex_cache = GetDexCache(i); 2929 if (dex_cache->GetDexFile() == &dex_file) { 2930 return true; 2931 } 2932 } 2933 return false; 2934} 2935 2936bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2937 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2938 return IsDexFileRegisteredLocked(dex_file); 2939} 2940 2941void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2942 Handle<mirror::DexCache> dex_cache) { 2943 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2944 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2945 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2946 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2947 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2948 dex_cache->SetDexFile(&dex_file); 2949 if (log_new_dex_caches_roots_) { 2950 // TODO: This is not safe if we can remove dex caches. 2951 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2952 } 2953} 2954 2955void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2956 Thread* self = Thread::Current(); 2957 { 2958 ReaderMutexLock mu(self, dex_lock_); 2959 if (IsDexFileRegisteredLocked(dex_file)) { 2960 return; 2961 } 2962 } 2963 // Don't alloc while holding the lock, since allocation may need to 2964 // suspend all threads and another thread may need the dex_lock_ to 2965 // get to a suspend point. 2966 StackHandleScope<1> hs(self); 2967 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2968 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2969 << dex_file.GetLocation(); 2970 { 2971 WriterMutexLock mu(self, dex_lock_); 2972 if (IsDexFileRegisteredLocked(dex_file)) { 2973 return; 2974 } 2975 RegisterDexFileLocked(dex_file, dex_cache); 2976 } 2977} 2978 2979void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2980 Handle<mirror::DexCache> dex_cache) { 2981 WriterMutexLock mu(Thread::Current(), dex_lock_); 2982 RegisterDexFileLocked(dex_file, dex_cache); 2983} 2984 2985mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2986 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2987 // Search assuming unique-ness of dex file. 2988 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2989 mirror::DexCache* dex_cache = GetDexCache(i); 2990 if (dex_cache->GetDexFile() == &dex_file) { 2991 return dex_cache; 2992 } 2993 } 2994 // Search matching by location name. 2995 std::string location(dex_file.GetLocation()); 2996 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2997 mirror::DexCache* dex_cache = GetDexCache(i); 2998 if (dex_cache->GetDexFile()->GetLocation() == location) { 2999 return dex_cache; 3000 } 3001 } 3002 // Failure, dump diagnostic and abort. 3003 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3004 mirror::DexCache* dex_cache = GetDexCache(i); 3005 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3006 } 3007 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3008 UNREACHABLE(); 3009} 3010 3011void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3012 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3013 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3014 mirror::DexCache* dex_cache = GetDexCache(i); 3015 dex_cache->Fixup(resolution_method); 3016 } 3017} 3018 3019mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3020 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3021 if (UNLIKELY(klass == nullptr)) { 3022 return nullptr; 3023 } 3024 return InitializePrimitiveClass(klass, type); 3025} 3026 3027mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3028 Primitive::Type type) { 3029 CHECK(primitive_class != nullptr); 3030 // Must hold lock on object when initializing. 3031 Thread* self = Thread::Current(); 3032 StackHandleScope<1> hs(self); 3033 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3034 ObjectLock<mirror::Class> lock(self, h_class); 3035 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3036 primitive_class->SetPrimitiveType(type); 3037 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3038 const char* descriptor = Primitive::Descriptor(type); 3039 mirror::Class* existing = InsertClass(descriptor, primitive_class, 3040 ComputeModifiedUtf8Hash(descriptor)); 3041 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3042 return primitive_class; 3043} 3044 3045// Create an array class (i.e. the class object for the array, not the 3046// array itself). "descriptor" looks like "[C" or "[[[[B" or 3047// "[Ljava/lang/String;". 3048// 3049// If "descriptor" refers to an array of primitives, look up the 3050// primitive type's internally-generated class object. 3051// 3052// "class_loader" is the class loader of the class that's referring to 3053// us. It's used to ensure that we're looking for the element type in 3054// the right context. It does NOT become the class loader for the 3055// array class; that always comes from the base element class. 3056// 3057// Returns nullptr with an exception raised on failure. 3058mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 3059 Handle<mirror::ClassLoader> class_loader) { 3060 // Identify the underlying component type 3061 CHECK_EQ('[', descriptor[0]); 3062 StackHandleScope<2> hs(self); 3063 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3064 class_loader))); 3065 if (component_type.Get() == nullptr) { 3066 DCHECK(self->IsExceptionPending()); 3067 // We need to accept erroneous classes as component types. 3068 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 3069 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get())); 3070 if (component_type.Get() == nullptr) { 3071 DCHECK(self->IsExceptionPending()); 3072 return nullptr; 3073 } else { 3074 self->ClearException(); 3075 } 3076 } 3077 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3078 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3079 return nullptr; 3080 } 3081 // See if the component type is already loaded. Array classes are 3082 // always associated with the class loader of their underlying 3083 // element type -- an array of Strings goes with the loader for 3084 // java/lang/String -- so we need to look for it there. (The 3085 // caller should have checked for the existence of the class 3086 // before calling here, but they did so with *their* class loader, 3087 // not the component type's loader.) 3088 // 3089 // If we find it, the caller adds "loader" to the class' initiating 3090 // loader list, which should prevent us from going through this again. 3091 // 3092 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3093 // are the same, because our caller (FindClass) just did the 3094 // lookup. (Even if we get this wrong we still have correct behavior, 3095 // because we effectively do this lookup again when we add the new 3096 // class to the hash table --- necessary because of possible races with 3097 // other threads.) 3098 if (class_loader.Get() != component_type->GetClassLoader()) { 3099 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader()); 3100 if (new_class != nullptr) { 3101 return new_class; 3102 } 3103 } 3104 3105 // Fill out the fields in the Class. 3106 // 3107 // It is possible to execute some methods against arrays, because 3108 // all arrays are subclasses of java_lang_Object_, so we need to set 3109 // up a vtable. We can just point at the one in java_lang_Object_. 3110 // 3111 // Array classes are simple enough that we don't need to do a full 3112 // link step. 3113 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3114 if (UNLIKELY(!init_done_)) { 3115 // Classes that were hand created, ie not by FindSystemClass 3116 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3117 new_class.Assign(GetClassRoot(kClassArrayClass)); 3118 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3119 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3120 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3121 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3122 } else if (strcmp(descriptor, 3123 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3124 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3125 } else if (strcmp(descriptor, 3126 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3127 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3128 } else if (strcmp(descriptor, "[C") == 0) { 3129 new_class.Assign(GetClassRoot(kCharArrayClass)); 3130 } else if (strcmp(descriptor, "[I") == 0) { 3131 new_class.Assign(GetClassRoot(kIntArrayClass)); 3132 } 3133 } 3134 if (new_class.Get() == nullptr) { 3135 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3136 if (new_class.Get() == nullptr) { 3137 return nullptr; 3138 } 3139 new_class->SetComponentType(component_type.Get()); 3140 } 3141 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3142 DCHECK(new_class->GetComponentType() != nullptr); 3143 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3144 new_class->SetSuperClass(java_lang_Object); 3145 new_class->SetVTable(java_lang_Object->GetVTable()); 3146 new_class->SetPrimitiveType(Primitive::kPrimNot); 3147 new_class->SetClassLoader(component_type->GetClassLoader()); 3148 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3149 { 3150 StackHandleScope<mirror::Class::kImtSize> hs2(self, 3151 Runtime::Current()->GetImtUnimplementedMethod()); 3152 new_class->PopulateEmbeddedImtAndVTable(&hs2); 3153 } 3154 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3155 // don't need to set new_class->SetObjectSize(..) 3156 // because Object::SizeOf delegates to Array::SizeOf 3157 3158 3159 // All arrays have java/lang/Cloneable and java/io/Serializable as 3160 // interfaces. We need to set that up here, so that stuff like 3161 // "instanceof" works right. 3162 // 3163 // Note: The GC could run during the call to FindSystemClass, 3164 // so we need to make sure the class object is GC-valid while we're in 3165 // there. Do this by clearing the interface list so the GC will just 3166 // think that the entries are null. 3167 3168 3169 // Use the single, global copies of "interfaces" and "iftable" 3170 // (remember not to free them for arrays). 3171 { 3172 mirror::IfTable* array_iftable = array_iftable_.Read(); 3173 CHECK(array_iftable != nullptr); 3174 new_class->SetIfTable(array_iftable); 3175 } 3176 3177 // Inherit access flags from the component type. 3178 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3179 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3180 access_flags &= kAccJavaFlagsMask; 3181 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3182 // and remove "interface". 3183 access_flags |= kAccAbstract | kAccFinal; 3184 access_flags &= ~kAccInterface; 3185 3186 new_class->SetAccessFlags(access_flags); 3187 3188 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 3189 if (existing == nullptr) { 3190 return new_class.Get(); 3191 } 3192 // Another thread must have loaded the class after we 3193 // started but before we finished. Abandon what we've 3194 // done. 3195 // 3196 // (Yes, this happens.) 3197 3198 return existing; 3199} 3200 3201mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3202 switch (type) { 3203 case 'B': 3204 return GetClassRoot(kPrimitiveByte); 3205 case 'C': 3206 return GetClassRoot(kPrimitiveChar); 3207 case 'D': 3208 return GetClassRoot(kPrimitiveDouble); 3209 case 'F': 3210 return GetClassRoot(kPrimitiveFloat); 3211 case 'I': 3212 return GetClassRoot(kPrimitiveInt); 3213 case 'J': 3214 return GetClassRoot(kPrimitiveLong); 3215 case 'S': 3216 return GetClassRoot(kPrimitiveShort); 3217 case 'Z': 3218 return GetClassRoot(kPrimitiveBoolean); 3219 case 'V': 3220 return GetClassRoot(kPrimitiveVoid); 3221 default: 3222 break; 3223 } 3224 std::string printable_type(PrintableChar(type)); 3225 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3226 return nullptr; 3227} 3228 3229mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3230 size_t hash) { 3231 if (VLOG_IS_ON(class_linker)) { 3232 mirror::DexCache* dex_cache = klass->GetDexCache(); 3233 std::string source; 3234 if (dex_cache != nullptr) { 3235 source += " from "; 3236 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3237 } 3238 LOG(INFO) << "Loaded class " << descriptor << source; 3239 } 3240 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3241 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3242 if (existing != nullptr) { 3243 return existing; 3244 } 3245 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3246 dex_cache_image_class_lookup_required_) { 3247 // Check a class loaded with the system class loader matches one in the image if the class 3248 // is in the image. 3249 existing = LookupClassFromImage(descriptor); 3250 if (existing != nullptr) { 3251 CHECK_EQ(klass, existing); 3252 } 3253 } 3254 VerifyObject(klass); 3255 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 3256 if (log_new_class_table_roots_) { 3257 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3258 } 3259 return nullptr; 3260} 3261 3262mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3263 size_t hash) { 3264 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3265 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 3266 hash); 3267 if (existing_it == class_table_.end()) { 3268 CHECK(klass->IsProxyClass()); 3269 return nullptr; 3270 } 3271 3272 mirror::Class* existing = existing_it->Read(); 3273 CHECK_NE(existing, klass) << descriptor; 3274 CHECK(!existing->IsResolved()) << descriptor; 3275 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3276 3277 CHECK(!klass->IsTemp()) << descriptor; 3278 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3279 dex_cache_image_class_lookup_required_) { 3280 // Check a class loaded with the system class loader matches one in the image if the class 3281 // is in the image. 3282 existing = LookupClassFromImage(descriptor); 3283 if (existing != nullptr) { 3284 CHECK_EQ(klass, existing) << descriptor; 3285 } 3286 } 3287 VerifyObject(klass); 3288 3289 // Update the element in the hash set. 3290 *existing_it = GcRoot<mirror::Class>(klass); 3291 if (log_new_class_table_roots_) { 3292 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3293 } 3294 3295 return existing; 3296} 3297 3298bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 3299 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3300 auto pair = std::make_pair(descriptor, class_loader); 3301 auto it = class_table_.Find(pair); 3302 if (it != class_table_.end()) { 3303 class_table_.Erase(it); 3304 return true; 3305 } 3306 it = pre_zygote_class_table_.Find(pair); 3307 if (it != pre_zygote_class_table_.end()) { 3308 pre_zygote_class_table_.Erase(it); 3309 return true; 3310 } 3311 return false; 3312} 3313 3314mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, size_t hash, 3315 mirror::ClassLoader* class_loader) { 3316 { 3317 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3318 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3319 if (result != nullptr) { 3320 return result; 3321 } 3322 } 3323 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3324 return nullptr; 3325 } else { 3326 // Lookup failed but need to search dex_caches_. 3327 mirror::Class* result = LookupClassFromImage(descriptor); 3328 if (result != nullptr) { 3329 InsertClass(descriptor, result, hash); 3330 } else { 3331 // Searching the image dex files/caches failed, we don't want to get into this situation 3332 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3333 // classes into the class table. 3334 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3335 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3336 MoveImageClassesToClassTable(); 3337 } 3338 } 3339 return result; 3340 } 3341} 3342 3343mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3344 mirror::ClassLoader* class_loader, 3345 size_t hash) { 3346 auto descriptor_pair = std::make_pair(descriptor, class_loader); 3347 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 3348 if (it == pre_zygote_class_table_.end()) { 3349 it = class_table_.FindWithHash(descriptor_pair, hash); 3350 if (it == class_table_.end()) { 3351 return nullptr; 3352 } 3353 } 3354 return it->Read(); 3355} 3356 3357static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3358 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3359 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3360 CHECK(image != nullptr); 3361 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3362 return root->AsObjectArray<mirror::DexCache>(); 3363} 3364 3365void ClassLinker::MoveImageClassesToClassTable() { 3366 Thread* self = Thread::Current(); 3367 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3368 if (!dex_cache_image_class_lookup_required_) { 3369 return; // All dex cache classes are already in the class table. 3370 } 3371 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3372 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3373 std::string temp; 3374 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3375 mirror::DexCache* dex_cache = dex_caches->Get(i); 3376 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3377 for (int32_t j = 0; j < types->GetLength(); j++) { 3378 mirror::Class* klass = types->Get(j); 3379 if (klass != nullptr) { 3380 DCHECK(klass->GetClassLoader() == nullptr); 3381 const char* descriptor = klass->GetDescriptor(&temp); 3382 size_t hash = ComputeModifiedUtf8Hash(descriptor); 3383 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3384 if (existing != nullptr) { 3385 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 3386 << PrettyClassAndClassLoader(klass); 3387 } else { 3388 class_table_.Insert(GcRoot<mirror::Class>(klass)); 3389 if (log_new_class_table_roots_) { 3390 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3391 } 3392 } 3393 } 3394 } 3395 } 3396 dex_cache_image_class_lookup_required_ = false; 3397} 3398 3399void ClassLinker::MoveClassTableToPreZygote() { 3400 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3401 DCHECK(pre_zygote_class_table_.Empty()); 3402 pre_zygote_class_table_ = std::move(class_table_); 3403 class_table_.Clear(); 3404} 3405 3406mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3407 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3408 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3409 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3410 mirror::DexCache* dex_cache = dex_caches->Get(i); 3411 const DexFile* dex_file = dex_cache->GetDexFile(); 3412 // Try binary searching the string/type index. 3413 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3414 if (string_id != nullptr) { 3415 const DexFile::TypeId* type_id = 3416 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3417 if (type_id != nullptr) { 3418 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3419 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3420 if (klass != nullptr) { 3421 return klass; 3422 } 3423 } 3424 } 3425 } 3426 return nullptr; 3427} 3428 3429void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3430 result.clear(); 3431 if (dex_cache_image_class_lookup_required_) { 3432 MoveImageClassesToClassTable(); 3433 } 3434 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3435 while (true) { 3436 auto it = class_table_.Find(descriptor); 3437 if (it == class_table_.end()) { 3438 break; 3439 } 3440 result.push_back(it->Read()); 3441 class_table_.Erase(it); 3442 } 3443 for (mirror::Class* k : result) { 3444 class_table_.Insert(GcRoot<mirror::Class>(k)); 3445 } 3446 size_t pre_zygote_start = result.size(); 3447 // Now handle the pre zygote table. 3448 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 3449 // called from the debugger. 3450 while (true) { 3451 auto it = pre_zygote_class_table_.Find(descriptor); 3452 if (it == pre_zygote_class_table_.end()) { 3453 break; 3454 } 3455 result.push_back(it->Read()); 3456 pre_zygote_class_table_.Erase(it); 3457 } 3458 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 3459 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 3460 } 3461} 3462 3463void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3464 // TODO: assert that the monitor on the Class is held 3465 ObjectLock<mirror::Class> lock(self, klass); 3466 3467 // Don't attempt to re-verify if already sufficiently verified. 3468 if (klass->IsVerified()) { 3469 EnsurePreverifiedMethods(klass); 3470 return; 3471 } 3472 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3473 return; 3474 } 3475 3476 // The class might already be erroneous, for example at compile time if we attempted to verify 3477 // this class as a parent to another. 3478 if (klass->IsErroneous()) { 3479 ThrowEarlierClassFailure(klass.Get()); 3480 return; 3481 } 3482 3483 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3484 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3485 } else { 3486 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3487 << PrettyClass(klass.Get()); 3488 CHECK(!Runtime::Current()->IsCompiler()); 3489 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3490 } 3491 3492 // Skip verification if disabled. 3493 if (!Runtime::Current()->IsVerificationEnabled()) { 3494 klass->SetStatus(mirror::Class::kStatusVerified, self); 3495 EnsurePreverifiedMethods(klass); 3496 return; 3497 } 3498 3499 // Verify super class. 3500 StackHandleScope<2> hs(self); 3501 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3502 if (super.Get() != nullptr) { 3503 // Acquire lock to prevent races on verifying the super class. 3504 ObjectLock<mirror::Class> super_lock(self, super); 3505 3506 if (!super->IsVerified() && !super->IsErroneous()) { 3507 VerifyClass(self, super); 3508 } 3509 if (!super->IsCompileTimeVerified()) { 3510 std::string error_msg( 3511 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3512 PrettyDescriptor(klass.Get()).c_str(), 3513 PrettyDescriptor(super.Get()).c_str())); 3514 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3515 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3516 if (cause.Get() != nullptr) { 3517 self->ClearException(); 3518 } 3519 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3520 if (cause.Get() != nullptr) { 3521 self->GetException(nullptr)->SetCause(cause.Get()); 3522 } 3523 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3524 if (Runtime::Current()->IsCompiler()) { 3525 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3526 } 3527 klass->SetStatus(mirror::Class::kStatusError, self); 3528 return; 3529 } 3530 } 3531 3532 // Try to use verification information from the oat file, otherwise do runtime verification. 3533 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3534 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3535 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3536 if (oat_file_class_status == mirror::Class::kStatusError) { 3537 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3538 << PrettyDescriptor(klass.Get()) << " in " 3539 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3540 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3541 PrettyDescriptor(klass.Get()).c_str()); 3542 klass->SetStatus(mirror::Class::kStatusError, self); 3543 return; 3544 } 3545 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3546 std::string error_msg; 3547 if (!preverified) { 3548 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3549 Runtime::Current()->IsCompiler(), 3550 &error_msg); 3551 } 3552 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3553 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3554 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3555 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3556 << " because: " << error_msg; 3557 } 3558 self->AssertNoPendingException(); 3559 // Make sure all classes referenced by catch blocks are resolved. 3560 ResolveClassExceptionHandlerTypes(dex_file, klass); 3561 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3562 // Even though there were no verifier failures we need to respect whether the super-class 3563 // was verified or requiring runtime reverification. 3564 if (super.Get() == nullptr || super->IsVerified()) { 3565 klass->SetStatus(mirror::Class::kStatusVerified, self); 3566 } else { 3567 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3568 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3569 // Pretend a soft failure occured so that we don't consider the class verified below. 3570 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3571 } 3572 } else { 3573 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3574 // Soft failures at compile time should be retried at runtime. Soft 3575 // failures at runtime will be handled by slow paths in the generated 3576 // code. Set status accordingly. 3577 if (Runtime::Current()->IsCompiler()) { 3578 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3579 } else { 3580 klass->SetStatus(mirror::Class::kStatusVerified, self); 3581 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3582 // later. 3583 klass->SetPreverified(); 3584 } 3585 } 3586 } else { 3587 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3588 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3589 << " because: " << error_msg; 3590 self->AssertNoPendingException(); 3591 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3592 klass->SetStatus(mirror::Class::kStatusError, self); 3593 } 3594 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3595 // Class is verified so we don't need to do any access check on its methods. 3596 // Let the interpreter know it by setting the kAccPreverified flag onto each 3597 // method. 3598 // Note: we're going here during compilation and at runtime. When we set the 3599 // kAccPreverified flag when compiling image classes, the flag is recorded 3600 // in the image and is set when loading the image. 3601 EnsurePreverifiedMethods(klass); 3602 } 3603} 3604 3605void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3606 if (!klass->IsPreverified()) { 3607 klass->SetPreverifiedFlagOnAllMethods(); 3608 klass->SetPreverified(); 3609 } 3610} 3611 3612bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3613 mirror::Class::Status& oat_file_class_status) { 3614 // If we're compiling, we can only verify the class using the oat file if 3615 // we are not compiling the image or if the class we're verifying is not part of 3616 // the app. In other words, we will only check for preverification of bootclasspath 3617 // classes. 3618 if (Runtime::Current()->IsCompiler()) { 3619 // Are we compiling the bootclasspath? 3620 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3621 return false; 3622 } 3623 // We are compiling an app (not the image). 3624 3625 // Is this an app class? (I.e. not a bootclasspath class) 3626 if (klass->GetClassLoader() != nullptr) { 3627 return false; 3628 } 3629 } 3630 3631 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3632 // In case we run without an image there won't be a backing oat file. 3633 if (oat_dex_file == nullptr) { 3634 return false; 3635 } 3636 3637 // We may be running with a preopted oat file but without image. In this case, 3638 // we don't skip verification of preverified classes to ensure we initialize 3639 // dex caches with all types resolved during verification. 3640 // We need to trust image classes, as these might be coming out of a pre-opted, quickened boot 3641 // image (that we just failed loading), and the verifier can't be run on quickened opcodes when 3642 // the runtime isn't started. On the other hand, app classes can be re-verified even if they are 3643 // already pre-opted, as then the runtime is started. 3644 if (!Runtime::Current()->IsCompiler() && 3645 !Runtime::Current()->GetHeap()->HasImageSpace() && 3646 klass->GetClassLoader() != nullptr) { 3647 return false; 3648 } 3649 3650 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3651 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3652 if (oat_file_class_status == mirror::Class::kStatusVerified || 3653 oat_file_class_status == mirror::Class::kStatusInitialized) { 3654 return true; 3655 } 3656 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3657 // Compile time verification failed with a soft error. Compile time verification can fail 3658 // because we have incomplete type information. Consider the following: 3659 // class ... { 3660 // Foo x; 3661 // .... () { 3662 // if (...) { 3663 // v1 gets assigned a type of resolved class Foo 3664 // } else { 3665 // v1 gets assigned a type of unresolved class Bar 3666 // } 3667 // iput x = v1 3668 // } } 3669 // when we merge v1 following the if-the-else it results in Conflict 3670 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3671 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3672 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3673 // at compile time). 3674 return false; 3675 } 3676 if (oat_file_class_status == mirror::Class::kStatusError) { 3677 // Compile time verification failed with a hard error. This is caused by invalid instructions 3678 // in the class. These errors are unrecoverable. 3679 return false; 3680 } 3681 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3682 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3683 // not loading the class. 3684 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3685 // isn't a problem and this case shouldn't occur 3686 return false; 3687 } 3688 std::string temp; 3689 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3690 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3691 << klass->GetDescriptor(&temp); 3692 UNREACHABLE(); 3693} 3694 3695void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3696 Handle<mirror::Class> klass) { 3697 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3698 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3699 } 3700 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3701 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3702 } 3703} 3704 3705void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3706 mirror::ArtMethod* method) { 3707 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3708 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3709 if (code_item == nullptr) { 3710 return; // native or abstract method 3711 } 3712 if (code_item->tries_size_ == 0) { 3713 return; // nothing to process 3714 } 3715 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3716 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3717 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3718 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3719 CatchHandlerIterator iterator(handlers_ptr); 3720 for (; iterator.HasNext(); iterator.Next()) { 3721 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3722 // unresolved exception types will be ignored by exception delivery 3723 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3724 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3725 if (exception_type == nullptr) { 3726 DCHECK(Thread::Current()->IsExceptionPending()); 3727 Thread::Current()->ClearException(); 3728 } 3729 } 3730 } 3731 handlers_ptr = iterator.EndDataPointer(); 3732 } 3733} 3734 3735static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3736static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3737 Handle<mirror::ArtMethod> prototype); 3738 3739mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3740 jobjectArray interfaces, jobject loader, 3741 jobjectArray methods, jobjectArray throws) { 3742 Thread* self = soa.Self(); 3743 StackHandleScope<8> hs(self); 3744 MutableHandle<mirror::Class> klass(hs.NewHandle( 3745 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3746 if (klass.Get() == nullptr) { 3747 CHECK(self->IsExceptionPending()); // OOME. 3748 return nullptr; 3749 } 3750 DCHECK(klass->GetClass() != nullptr); 3751 klass->SetObjectSize(sizeof(mirror::Proxy)); 3752 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3753 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3754 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3755 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3756 klass->SetName(soa.Decode<mirror::String*>(name)); 3757 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3758 klass->SetDexCache(proxy_class->GetDexCache()); 3759 klass->SetStatus(mirror::Class::kStatusIdx, self); 3760 3761 // Instance fields are inherited, but we add a couple of static fields... 3762 { 3763 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3764 if (UNLIKELY(sfields == nullptr)) { 3765 CHECK(self->IsExceptionPending()); // OOME. 3766 return nullptr; 3767 } 3768 klass->SetSFields(sfields); 3769 } 3770 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3771 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3772 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3773 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3774 CHECK(self->IsExceptionPending()); // OOME. 3775 return nullptr; 3776 } 3777 klass->SetStaticField(0, interfaces_sfield.Get()); 3778 interfaces_sfield->SetDexFieldIndex(0); 3779 interfaces_sfield->SetDeclaringClass(klass.Get()); 3780 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3781 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3782 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3783 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3784 CHECK(self->IsExceptionPending()); // OOME. 3785 return nullptr; 3786 } 3787 klass->SetStaticField(1, throws_sfield.Get()); 3788 throws_sfield->SetDexFieldIndex(1); 3789 throws_sfield->SetDeclaringClass(klass.Get()); 3790 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3791 3792 // Proxies have 1 direct method, the constructor 3793 { 3794 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3795 if (UNLIKELY(directs == nullptr)) { 3796 CHECK(self->IsExceptionPending()); // OOME. 3797 return nullptr; 3798 } 3799 klass->SetDirectMethods(directs); 3800 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3801 if (UNLIKELY(constructor == nullptr)) { 3802 CHECK(self->IsExceptionPending()); // OOME. 3803 return nullptr; 3804 } 3805 klass->SetDirectMethod(0, constructor); 3806 } 3807 3808 // Create virtual method using specified prototypes. 3809 size_t num_virtual_methods = 3810 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3811 { 3812 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3813 num_virtual_methods); 3814 if (UNLIKELY(virtuals == nullptr)) { 3815 CHECK(self->IsExceptionPending()); // OOME. 3816 return nullptr; 3817 } 3818 klass->SetVirtualMethods(virtuals); 3819 } 3820 for (size_t i = 0; i < num_virtual_methods; ++i) { 3821 StackHandleScope<1> hs2(self); 3822 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3823 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3824 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3825 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3826 if (UNLIKELY(clone == nullptr)) { 3827 CHECK(self->IsExceptionPending()); // OOME. 3828 return nullptr; 3829 } 3830 klass->SetVirtualMethod(i, clone); 3831 } 3832 3833 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3834 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3835 self->AssertNoPendingException(); 3836 3837 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3838 mirror::Class* new_class = nullptr; 3839 { 3840 // Must hold lock on object when resolved. 3841 ObjectLock<mirror::Class> resolution_lock(self, klass); 3842 // Link the fields and virtual methods, creating vtable and iftables 3843 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3844 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3845 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3846 klass->SetStatus(mirror::Class::kStatusError, self); 3847 return nullptr; 3848 } 3849 } 3850 3851 CHECK(klass->IsRetired()); 3852 CHECK_NE(klass.Get(), new_class); 3853 klass.Assign(new_class); 3854 3855 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3856 interfaces_sfield->SetObject<false>(klass.Get(), 3857 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3858 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3859 throws_sfield->SetObject<false>(klass.Get(), 3860 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3861 3862 { 3863 // Lock on klass is released. Lock new class object. 3864 ObjectLock<mirror::Class> initialization_lock(self, klass); 3865 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3866 } 3867 3868 // sanity checks 3869 if (kIsDebugBuild) { 3870 CHECK(klass->GetIFields() == nullptr); 3871 CheckProxyConstructor(klass->GetDirectMethod(0)); 3872 for (size_t i = 0; i < num_virtual_methods; ++i) { 3873 StackHandleScope<2> hs2(self); 3874 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3875 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3876 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3877 Handle<mirror::ArtMethod> virtual_method(hs2.NewHandle(klass->GetVirtualMethod(i))); 3878 CheckProxyMethod(virtual_method, prototype); 3879 } 3880 3881 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3882 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3883 decoded_name->ToModifiedUtf8().c_str())); 3884 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3885 3886 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3887 decoded_name->ToModifiedUtf8().c_str())); 3888 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3889 3890 CHECK_EQ(klass.Get()->GetInterfaces(), 3891 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3892 CHECK_EQ(klass.Get()->GetThrows(), 3893 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3894 } 3895 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3896 ComputeModifiedUtf8Hash(descriptor.c_str())); 3897 CHECK(existing == nullptr); 3898 return klass.Get(); 3899} 3900 3901std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3902 DCHECK(proxy_class->IsProxyClass()); 3903 mirror::String* name = proxy_class->GetName(); 3904 DCHECK(name != nullptr); 3905 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3906} 3907 3908mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3909 mirror::ArtMethod* proxy_method) { 3910 DCHECK(proxy_class->IsProxyClass()); 3911 DCHECK(proxy_method->IsProxyMethod()); 3912 // Locate the dex cache of the original interface/Object 3913 mirror::DexCache* dex_cache = nullptr; 3914 { 3915 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3916 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3917 mirror::DexCache* a_dex_cache = GetDexCache(i); 3918 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3919 dex_cache = a_dex_cache; 3920 break; 3921 } 3922 } 3923 } 3924 CHECK(dex_cache != nullptr); 3925 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3926 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3927 CHECK(resolved_method != nullptr); 3928 return resolved_method; 3929} 3930 3931 3932mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3933 Handle<mirror::Class> klass, 3934 mirror::Class* proxy_class) { 3935 // Create constructor for Proxy that must initialize h 3936 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3937 proxy_class->GetDirectMethods(); 3938 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3939 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3940 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3941 // constructor method. 3942 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3943 proxy_constructor); 3944 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3945 // code_ too) 3946 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3947 if (constructor == nullptr) { 3948 CHECK(self->IsExceptionPending()); // OOME. 3949 return nullptr; 3950 } 3951 // Make this constructor public and fix the class to be our Proxy version 3952 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3953 constructor->SetDeclaringClass(klass.Get()); 3954 return constructor; 3955} 3956 3957static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3958 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3959 CHECK(constructor->IsConstructor()); 3960 CHECK_STREQ(constructor->GetName(), "<init>"); 3961 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3962 "(Ljava/lang/reflect/InvocationHandler;)V"); 3963 DCHECK(constructor->IsPublic()); 3964} 3965 3966mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3967 Handle<mirror::Class> klass, 3968 Handle<mirror::ArtMethod> prototype) { 3969 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3970 // prototype method 3971 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3972 prototype.Get()); 3973 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3974 // as necessary 3975 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3976 if (UNLIKELY(method == nullptr)) { 3977 CHECK(self->IsExceptionPending()); // OOME. 3978 return nullptr; 3979 } 3980 3981 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3982 // the intersection of throw exceptions as defined in Proxy 3983 method->SetDeclaringClass(klass.Get()); 3984 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3985 3986 // At runtime the method looks like a reference and argument saving method, clone the code 3987 // related parameters from this method. 3988 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3989 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3990 3991 return method; 3992} 3993 3994static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3995 Handle<mirror::ArtMethod> prototype) 3996 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3997 // Basic sanity 3998 CHECK(!prototype->IsFinal()); 3999 CHECK(method->IsFinal()); 4000 CHECK(!method->IsAbstract()); 4001 4002 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4003 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4004 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4005 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4006 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4007 4008 CHECK_STREQ(method->GetName(), prototype->GetName()); 4009 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4010 // More complex sanity - via dex cache 4011 CHECK_EQ(method->GetInterfaceMethodIfProxy()->GetReturnType(), prototype->GetReturnType()); 4012} 4013 4014static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4015 bool can_init_parents) 4016 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4017 if (can_init_statics && can_init_parents) { 4018 return true; 4019 } 4020 if (!can_init_statics) { 4021 // Check if there's a class initializer. 4022 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4023 if (clinit != nullptr) { 4024 return false; 4025 } 4026 // Check if there are encoded static values needing initialization. 4027 if (klass->NumStaticFields() != 0) { 4028 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4029 DCHECK(dex_class_def != nullptr); 4030 if (dex_class_def->static_values_off_ != 0) { 4031 return false; 4032 } 4033 } 4034 } 4035 if (!klass->IsInterface() && klass->HasSuperClass()) { 4036 mirror::Class* super_class = klass->GetSuperClass(); 4037 if (!can_init_parents && !super_class->IsInitialized()) { 4038 return false; 4039 } else { 4040 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4041 return false; 4042 } 4043 } 4044 } 4045 return true; 4046} 4047 4048bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4049 bool can_init_statics, bool can_init_parents) { 4050 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4051 4052 // Are we already initialized and therefore done? 4053 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4054 // an initialized class will never change its state. 4055 if (klass->IsInitialized()) { 4056 return true; 4057 } 4058 4059 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4060 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4061 return false; 4062 } 4063 4064 self->AllowThreadSuspension(); 4065 uint64_t t0; 4066 { 4067 ObjectLock<mirror::Class> lock(self, klass); 4068 4069 // Re-check under the lock in case another thread initialized ahead of us. 4070 if (klass->IsInitialized()) { 4071 return true; 4072 } 4073 4074 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4075 if (klass->IsErroneous()) { 4076 ThrowEarlierClassFailure(klass.Get()); 4077 VlogClassInitializationFailure(klass); 4078 return false; 4079 } 4080 4081 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4082 4083 if (!klass->IsVerified()) { 4084 VerifyClass(self, klass); 4085 if (!klass->IsVerified()) { 4086 // We failed to verify, expect either the klass to be erroneous or verification failed at 4087 // compile time. 4088 if (klass->IsErroneous()) { 4089 CHECK(self->IsExceptionPending()); 4090 VlogClassInitializationFailure(klass); 4091 } else { 4092 CHECK(Runtime::Current()->IsCompiler()); 4093 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4094 } 4095 return false; 4096 } else { 4097 self->AssertNoPendingException(); 4098 } 4099 } 4100 4101 // If the class is kStatusInitializing, either this thread is 4102 // initializing higher up the stack or another thread has beat us 4103 // to initializing and we need to wait. Either way, this 4104 // invocation of InitializeClass will not be responsible for 4105 // running <clinit> and will return. 4106 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4107 // Could have got an exception during verification. 4108 if (self->IsExceptionPending()) { 4109 VlogClassInitializationFailure(klass); 4110 return false; 4111 } 4112 // We caught somebody else in the act; was it us? 4113 if (klass->GetClinitThreadId() == self->GetTid()) { 4114 // Yes. That's fine. Return so we can continue initializing. 4115 return true; 4116 } 4117 // No. That's fine. Wait for another thread to finish initializing. 4118 return WaitForInitializeClass(klass, self, lock); 4119 } 4120 4121 if (!ValidateSuperClassDescriptors(klass)) { 4122 klass->SetStatus(mirror::Class::kStatusError, self); 4123 return false; 4124 } 4125 self->AllowThreadSuspension(); 4126 4127 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4128 4129 // From here out other threads may observe that we're initializing and so changes of state 4130 // require the a notification. 4131 klass->SetClinitThreadId(self->GetTid()); 4132 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4133 4134 t0 = NanoTime(); 4135 } 4136 4137 // Initialize super classes, must be done while initializing for the JLS. 4138 if (!klass->IsInterface() && klass->HasSuperClass()) { 4139 mirror::Class* super_class = klass->GetSuperClass(); 4140 if (!super_class->IsInitialized()) { 4141 CHECK(!super_class->IsInterface()); 4142 CHECK(can_init_parents); 4143 StackHandleScope<1> hs(self); 4144 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4145 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4146 if (!super_initialized) { 4147 // The super class was verified ahead of entering initializing, we should only be here if 4148 // the super class became erroneous due to initialization. 4149 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4150 << "Super class initialization failed for " 4151 << PrettyDescriptor(handle_scope_super.Get()) 4152 << " that has unexpected status " << handle_scope_super->GetStatus() 4153 << "\nPending exception:\n" 4154 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4155 ObjectLock<mirror::Class> lock(self, klass); 4156 // Initialization failed because the super-class is erroneous. 4157 klass->SetStatus(mirror::Class::kStatusError, self); 4158 return false; 4159 } 4160 } 4161 } 4162 4163 const size_t num_static_fields = klass->NumStaticFields(); 4164 if (num_static_fields > 0) { 4165 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4166 CHECK(dex_class_def != nullptr); 4167 const DexFile& dex_file = klass->GetDexFile(); 4168 StackHandleScope<3> hs(self); 4169 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4170 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4171 4172 // Eagerly fill in static fields so that the we don't have to do as many expensive 4173 // Class::FindStaticField in ResolveField. 4174 for (size_t i = 0; i < num_static_fields; ++i) { 4175 mirror::ArtField* field = klass->GetStaticField(i); 4176 const uint32_t field_idx = field->GetDexFieldIndex(); 4177 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 4178 if (resolved_field == nullptr) { 4179 dex_cache->SetResolvedField(field_idx, field); 4180 } else { 4181 DCHECK_EQ(field, resolved_field); 4182 } 4183 } 4184 4185 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4186 this, *dex_class_def); 4187 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4188 ClassDataItemIterator field_it(dex_file, class_data); 4189 if (value_it.HasNext()) { 4190 DCHECK(field_it.HasNextStaticField()); 4191 CHECK(can_init_statics); 4192 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4193 StackHandleScope<1> hs2(self); 4194 Handle<mirror::ArtField> field(hs2.NewHandle( 4195 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4196 if (Runtime::Current()->IsActiveTransaction()) { 4197 value_it.ReadValueToField<true>(field); 4198 } else { 4199 value_it.ReadValueToField<false>(field); 4200 } 4201 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4202 } 4203 } 4204 } 4205 4206 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4207 if (clinit != nullptr) { 4208 CHECK(can_init_statics); 4209 JValue result; 4210 clinit->Invoke(self, nullptr, 0, &result, "V"); 4211 } 4212 4213 self->AllowThreadSuspension(); 4214 uint64_t t1 = NanoTime(); 4215 4216 bool success = true; 4217 { 4218 ObjectLock<mirror::Class> lock(self, klass); 4219 4220 if (self->IsExceptionPending()) { 4221 WrapExceptionInInitializer(klass); 4222 klass->SetStatus(mirror::Class::kStatusError, self); 4223 success = false; 4224 } else if (Runtime::Current()->IsTransactionAborted()) { 4225 // The exception thrown when the transaction aborted has been caught and cleared 4226 // so we need to throw it again now. 4227 LOG(WARNING) << "Return from class initializer of " << PrettyDescriptor(klass.Get()) 4228 << " without exception while transaction was aborted: re-throw it now."; 4229 Runtime::Current()->ThrowInternalErrorForAbortedTransaction(self); 4230 klass->SetStatus(mirror::Class::kStatusError, self); 4231 success = false; 4232 } else { 4233 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4234 RuntimeStats* thread_stats = self->GetStats(); 4235 ++global_stats->class_init_count; 4236 ++thread_stats->class_init_count; 4237 global_stats->class_init_time_ns += (t1 - t0); 4238 thread_stats->class_init_time_ns += (t1 - t0); 4239 // Set the class as initialized except if failed to initialize static fields. 4240 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4241 if (VLOG_IS_ON(class_linker)) { 4242 std::string temp; 4243 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4244 klass->GetLocation(); 4245 } 4246 // Opportunistically set static method trampolines to their destination. 4247 FixupStaticTrampolines(klass.Get()); 4248 } 4249 } 4250 return success; 4251} 4252 4253bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4254 ObjectLock<mirror::Class>& lock) 4255 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4256 while (true) { 4257 self->AssertNoPendingException(); 4258 CHECK(!klass->IsInitialized()); 4259 lock.WaitIgnoringInterrupts(); 4260 4261 // When we wake up, repeat the test for init-in-progress. If 4262 // there's an exception pending (only possible if 4263 // we were not using WaitIgnoringInterrupts), bail out. 4264 if (self->IsExceptionPending()) { 4265 WrapExceptionInInitializer(klass); 4266 klass->SetStatus(mirror::Class::kStatusError, self); 4267 return false; 4268 } 4269 // Spurious wakeup? Go back to waiting. 4270 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4271 continue; 4272 } 4273 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4274 // Compile time initialization failed. 4275 return false; 4276 } 4277 if (klass->IsErroneous()) { 4278 // The caller wants an exception, but it was thrown in a 4279 // different thread. Synthesize one here. 4280 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4281 PrettyDescriptor(klass.Get()).c_str()); 4282 VlogClassInitializationFailure(klass); 4283 return false; 4284 } 4285 if (klass->IsInitialized()) { 4286 return true; 4287 } 4288 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4289 << klass->GetStatus(); 4290 } 4291 UNREACHABLE(); 4292} 4293 4294static bool HasSameSignatureWithDifferentClassLoaders(Thread* self, 4295 Handle<mirror::ArtMethod> method1, 4296 Handle<mirror::ArtMethod> method2) 4297 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4298 { 4299 StackHandleScope<1> hs(self); 4300 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType())); 4301 if (UNLIKELY(method2->GetReturnType() != return_type.Get())) { 4302 return false; 4303 } 4304 } 4305 const DexFile::TypeList* types1 = method1->GetParameterTypeList(); 4306 const DexFile::TypeList* types2 = method2->GetParameterTypeList(); 4307 if (types1 == nullptr) { 4308 return (types2 == nullptr) || (types2->Size() == 0); 4309 } else if (UNLIKELY(types2 == nullptr)) { 4310 return types1->Size() == 0; 4311 } 4312 uint32_t num_types = types1->Size(); 4313 if (UNLIKELY(num_types != types2->Size())) { 4314 return false; 4315 } 4316 for (uint32_t i = 0; i < num_types; ++i) { 4317 mirror::Class* param_type = 4318 method1->GetClassFromTypeIndex(types1->GetTypeItem(i).type_idx_, true); 4319 mirror::Class* other_param_type = 4320 method2->GetClassFromTypeIndex(types2->GetTypeItem(i).type_idx_, true); 4321 if (UNLIKELY(param_type != other_param_type)) { 4322 return false; 4323 } 4324 } 4325 return true; 4326} 4327 4328 4329bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4330 if (klass->IsInterface()) { 4331 return true; 4332 } 4333 // Begin with the methods local to the superclass. 4334 Thread* self = Thread::Current(); 4335 StackHandleScope<2> hs(self); 4336 MutableHandle<mirror::ArtMethod> h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4337 MutableHandle<mirror::ArtMethod> super_h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4338 if (klass->HasSuperClass() && 4339 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4340 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4341 h_m.Assign(klass->GetVTableEntry(i)); 4342 super_h_m.Assign(klass->GetSuperClass()->GetVTableEntry(i)); 4343 if (h_m.Get() != super_h_m.Get() && 4344 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4345 ThrowLinkageError(klass.Get(), 4346 "Class %s method %s resolves differently in superclass %s", 4347 PrettyDescriptor(klass.Get()).c_str(), 4348 PrettyMethod(h_m.Get()).c_str(), 4349 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4350 return false; 4351 } 4352 } 4353 } 4354 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4355 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4356 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4357 for (uint32_t j = 0; j < num_methods; ++j) { 4358 h_m.Assign(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4359 super_h_m.Assign(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4360 if (h_m.Get() != super_h_m.Get() && 4361 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4362 ThrowLinkageError(klass.Get(), 4363 "Class %s method %s resolves differently in interface %s", 4364 PrettyDescriptor(klass.Get()).c_str(), 4365 PrettyMethod(h_m.Get()).c_str(), 4366 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4367 return false; 4368 } 4369 } 4370 } 4371 } 4372 return true; 4373} 4374 4375bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4376 bool can_init_parents) { 4377 DCHECK(c.Get() != nullptr); 4378 if (c->IsInitialized()) { 4379 EnsurePreverifiedMethods(c); 4380 return true; 4381 } 4382 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4383 if (!success) { 4384 if (can_init_fields && can_init_parents) { 4385 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4386 } 4387 } else { 4388 self->AssertNoPendingException(); 4389 } 4390 return success; 4391} 4392 4393void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4394 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4395 if (fields != nullptr) { 4396 for (int index = 0; index < fields->GetLength(); index ++) { 4397 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4398 fields->Get(index)->SetDeclaringClass(new_class); 4399 } 4400 } 4401 } 4402 4403 fields = new_class->GetSFields(); 4404 if (fields != nullptr) { 4405 for (int index = 0; index < fields->GetLength(); index ++) { 4406 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4407 fields->Get(index)->SetDeclaringClass(new_class); 4408 } 4409 } 4410 } 4411 4412 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4413 if (methods != nullptr) { 4414 for (int index = 0; index < methods->GetLength(); index ++) { 4415 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4416 methods->Get(index)->SetDeclaringClass(new_class); 4417 } 4418 } 4419 } 4420 4421 methods = new_class->GetVirtualMethods(); 4422 if (methods != nullptr) { 4423 for (int index = 0; index < methods->GetLength(); index ++) { 4424 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4425 methods->Get(index)->SetDeclaringClass(new_class); 4426 } 4427 } 4428 } 4429} 4430 4431bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4432 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4433 mirror::Class** new_class) { 4434 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4435 4436 if (!LinkSuperClass(klass)) { 4437 return false; 4438 } 4439 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4440 self, Runtime::Current()->GetImtUnimplementedMethod()); 4441 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4442 return false; 4443 } 4444 if (!LinkInstanceFields(self, klass)) { 4445 return false; 4446 } 4447 size_t class_size; 4448 if (!LinkStaticFields(self, klass, &class_size)) { 4449 return false; 4450 } 4451 CreateReferenceInstanceOffsets(klass); 4452 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4453 4454 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4455 // We don't need to retire this class as it has no embedded tables or it was created the 4456 // correct size during class linker initialization. 4457 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4458 4459 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4460 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4461 } 4462 4463 // This will notify waiters on klass that saw the not yet resolved 4464 // class in the class_table_ during EnsureResolved. 4465 klass->SetStatus(mirror::Class::kStatusResolved, self); 4466 *new_class = klass.Get(); 4467 } else { 4468 CHECK(!klass->IsResolved()); 4469 // Retire the temporary class and create the correctly sized resolved class. 4470 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4471 if (UNLIKELY(*new_class == nullptr)) { 4472 CHECK(self->IsExceptionPending()); // Expect an OOME. 4473 klass->SetStatus(mirror::Class::kStatusError, self); 4474 return false; 4475 } 4476 4477 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4478 StackHandleScope<1> hs(self); 4479 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4480 ObjectLock<mirror::Class> lock(self, new_class_h); 4481 4482 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4483 4484 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 4485 ComputeModifiedUtf8Hash(descriptor)); 4486 CHECK(existing == nullptr || existing == klass.Get()); 4487 4488 // This will notify waiters on temp class that saw the not yet resolved class in the 4489 // class_table_ during EnsureResolved. 4490 klass->SetStatus(mirror::Class::kStatusRetired, self); 4491 4492 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4493 // This will notify waiters on new_class that saw the not yet resolved 4494 // class in the class_table_ during EnsureResolved. 4495 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4496 } 4497 return true; 4498} 4499 4500static void CountMethodsAndFields(ClassDataItemIterator& dex_data, 4501 size_t* virtual_methods, 4502 size_t* direct_methods, 4503 size_t* static_fields, 4504 size_t* instance_fields) { 4505 *virtual_methods = *direct_methods = *static_fields = *instance_fields = 0; 4506 4507 while (dex_data.HasNextStaticField()) { 4508 dex_data.Next(); 4509 (*static_fields)++; 4510 } 4511 while (dex_data.HasNextInstanceField()) { 4512 dex_data.Next(); 4513 (*instance_fields)++; 4514 } 4515 while (dex_data.HasNextDirectMethod()) { 4516 (*direct_methods)++; 4517 dex_data.Next(); 4518 } 4519 while (dex_data.HasNextVirtualMethod()) { 4520 (*virtual_methods)++; 4521 dex_data.Next(); 4522 } 4523 DCHECK(!dex_data.HasNext()); 4524} 4525 4526static void DumpClass(std::ostream& os, 4527 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4528 const char* suffix) { 4529 ClassDataItemIterator dex_data(dex_file, dex_file.GetClassData(dex_class_def)); 4530 os << dex_file.GetClassDescriptor(dex_class_def) << suffix << ":\n"; 4531 os << " Static fields:\n"; 4532 while (dex_data.HasNextStaticField()) { 4533 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4534 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4535 dex_data.Next(); 4536 } 4537 os << " Instance fields:\n"; 4538 while (dex_data.HasNextInstanceField()) { 4539 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4540 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4541 dex_data.Next(); 4542 } 4543 os << " Direct methods:\n"; 4544 while (dex_data.HasNextDirectMethod()) { 4545 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4546 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4547 dex_data.Next(); 4548 } 4549 os << " Virtual methods:\n"; 4550 while (dex_data.HasNextVirtualMethod()) { 4551 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4552 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4553 dex_data.Next(); 4554 } 4555} 4556 4557static std::string DumpClasses(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4558 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2) { 4559 std::ostringstream os; 4560 DumpClass(os, dex_file1, dex_class_def1, " (Compile time)"); 4561 DumpClass(os, dex_file2, dex_class_def2, " (Runtime)"); 4562 return os.str(); 4563} 4564 4565 4566// Very simple structural check on whether the classes match. Only compares the number of 4567// methods and fields. 4568static bool SimpleStructuralCheck(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4569 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2, 4570 std::string* error_msg) { 4571 ClassDataItemIterator dex_data1(dex_file1, dex_file1.GetClassData(dex_class_def1)); 4572 ClassDataItemIterator dex_data2(dex_file2, dex_file2.GetClassData(dex_class_def2)); 4573 4574 // Counters for current dex file. 4575 size_t dex_virtual_methods1, dex_direct_methods1, dex_static_fields1, dex_instance_fields1; 4576 CountMethodsAndFields(dex_data1, &dex_virtual_methods1, &dex_direct_methods1, &dex_static_fields1, 4577 &dex_instance_fields1); 4578 // Counters for compile-time dex file. 4579 size_t dex_virtual_methods2, dex_direct_methods2, dex_static_fields2, dex_instance_fields2; 4580 CountMethodsAndFields(dex_data2, &dex_virtual_methods2, &dex_direct_methods2, &dex_static_fields2, 4581 &dex_instance_fields2); 4582 4583 if (dex_virtual_methods1 != dex_virtual_methods2) { 4584 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4585 *error_msg = StringPrintf("Virtual method count off: %zu vs %zu\n%s", dex_virtual_methods1, 4586 dex_virtual_methods2, class_dump.c_str()); 4587 return false; 4588 } 4589 if (dex_direct_methods1 != dex_direct_methods2) { 4590 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4591 *error_msg = StringPrintf("Direct method count off: %zu vs %zu\n%s", dex_direct_methods1, 4592 dex_direct_methods2, class_dump.c_str()); 4593 return false; 4594 } 4595 if (dex_static_fields1 != dex_static_fields2) { 4596 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4597 *error_msg = StringPrintf("Static field count off: %zu vs %zu\n%s", dex_static_fields1, 4598 dex_static_fields2, class_dump.c_str()); 4599 return false; 4600 } 4601 if (dex_instance_fields1 != dex_instance_fields2) { 4602 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4603 *error_msg = StringPrintf("Instance field count off: %zu vs %zu\n%s", dex_instance_fields1, 4604 dex_instance_fields2, class_dump.c_str()); 4605 return false; 4606 } 4607 4608 return true; 4609} 4610 4611// Checks whether a the super-class changed from what we had at compile-time. This would 4612// invalidate quickening. 4613static bool CheckSuperClassChange(Handle<mirror::Class> klass, 4614 const DexFile& dex_file, 4615 const DexFile::ClassDef& class_def, 4616 mirror::Class* super_class) 4617 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4618 // Check for unexpected changes in the superclass. 4619 // Quick check 1) is the super_class class-loader the boot class loader? This always has 4620 // precedence. 4621 if (super_class->GetClassLoader() != nullptr && 4622 // Quick check 2) different dex cache? Breaks can only occur for different dex files, 4623 // which is implied by different dex cache. 4624 klass->GetDexCache() != super_class->GetDexCache()) { 4625 // Now comes the expensive part: things can be broken if (a) the klass' dex file has a 4626 // definition for the super-class, and (b) the files are in separate oat files. The oat files 4627 // are referenced from the dex file, so do (b) first. Only relevant if we have oat files. 4628 const OatFile* class_oat_file = dex_file.GetOatFile(); 4629 if (class_oat_file != nullptr) { 4630 const OatFile* loaded_super_oat_file = super_class->GetDexFile().GetOatFile(); 4631 if (loaded_super_oat_file != nullptr && class_oat_file != loaded_super_oat_file) { 4632 // Now check (a). 4633 const DexFile::ClassDef* super_class_def = dex_file.FindClassDef(class_def.superclass_idx_); 4634 if (super_class_def != nullptr) { 4635 // Uh-oh, we found something. Do our check. 4636 std::string error_msg; 4637 if (!SimpleStructuralCheck(dex_file, *super_class_def, 4638 super_class->GetDexFile(), *super_class->GetClassDef(), 4639 &error_msg)) { 4640 // Print a warning to the log. This exception might be caught, e.g., as common in test 4641 // drivers. When the class is later tried to be used, we re-throw a new instance, as we 4642 // only save the type of the exception. 4643 LOG(WARNING) << "Incompatible structural change detected: " << 4644 StringPrintf( 4645 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4646 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4647 class_oat_file->GetLocation().c_str(), 4648 loaded_super_oat_file->GetLocation().c_str(), 4649 error_msg.c_str()); 4650 ThrowIncompatibleClassChangeError(klass.Get(), 4651 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4652 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4653 class_oat_file->GetLocation().c_str(), 4654 loaded_super_oat_file->GetLocation().c_str(), 4655 error_msg.c_str()); 4656 return false; 4657 } 4658 } 4659 } 4660 } 4661 } 4662 return true; 4663} 4664 4665bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4666 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4667 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4668 uint16_t super_class_idx = class_def.superclass_idx_; 4669 if (super_class_idx != DexFile::kDexNoIndex16) { 4670 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4671 if (super_class == nullptr) { 4672 DCHECK(Thread::Current()->IsExceptionPending()); 4673 return false; 4674 } 4675 // Verify 4676 if (!klass->CanAccess(super_class)) { 4677 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4678 PrettyDescriptor(super_class).c_str(), 4679 PrettyDescriptor(klass.Get()).c_str()); 4680 return false; 4681 } 4682 CHECK(super_class->IsResolved()); 4683 klass->SetSuperClass(super_class); 4684 4685 if (!CheckSuperClassChange(klass, dex_file, class_def, super_class)) { 4686 DCHECK(Thread::Current()->IsExceptionPending()); 4687 return false; 4688 } 4689 } 4690 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4691 if (interfaces != nullptr) { 4692 for (size_t i = 0; i < interfaces->Size(); i++) { 4693 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4694 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4695 if (interface == nullptr) { 4696 DCHECK(Thread::Current()->IsExceptionPending()); 4697 return false; 4698 } 4699 // Verify 4700 if (!klass->CanAccess(interface)) { 4701 // TODO: the RI seemed to ignore this in my testing. 4702 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4703 PrettyDescriptor(interface).c_str(), 4704 PrettyDescriptor(klass.Get()).c_str()); 4705 return false; 4706 } 4707 } 4708 } 4709 // Mark the class as loaded. 4710 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4711 return true; 4712} 4713 4714bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4715 CHECK(!klass->IsPrimitive()); 4716 mirror::Class* super = klass->GetSuperClass(); 4717 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4718 if (super != nullptr) { 4719 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4720 return false; 4721 } 4722 return true; 4723 } 4724 if (super == nullptr) { 4725 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4726 PrettyDescriptor(klass.Get()).c_str()); 4727 return false; 4728 } 4729 // Verify 4730 if (super->IsFinal() || super->IsInterface()) { 4731 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4732 PrettyDescriptor(super).c_str(), 4733 PrettyDescriptor(klass.Get()).c_str(), 4734 super->IsFinal() ? "declared final" : "an interface"); 4735 return false; 4736 } 4737 if (!klass->CanAccess(super)) { 4738 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4739 PrettyDescriptor(super).c_str(), 4740 PrettyDescriptor(klass.Get()).c_str()); 4741 return false; 4742 } 4743 4744 // Inherit kAccClassIsFinalizable from the superclass in case this 4745 // class doesn't override finalize. 4746 if (super->IsFinalizable()) { 4747 klass->SetFinalizable(); 4748 } 4749 4750 // Inherit reference flags (if any) from the superclass. 4751 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4752 if (reference_flags != 0) { 4753 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4754 } 4755 // Disallow custom direct subclasses of java.lang.ref.Reference. 4756 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4757 ThrowLinkageError(klass.Get(), 4758 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4759 PrettyDescriptor(klass.Get()).c_str()); 4760 return false; 4761 } 4762 4763 if (kIsDebugBuild) { 4764 // Ensure super classes are fully resolved prior to resolving fields.. 4765 while (super != nullptr) { 4766 CHECK(super->IsResolved()); 4767 super = super->GetSuperClass(); 4768 } 4769 } 4770 return true; 4771} 4772 4773// Populate the class vtable and itable. Compute return type indices. 4774bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4775 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4776 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4777 self->AllowThreadSuspension(); 4778 if (klass->IsInterface()) { 4779 // No vtable. 4780 size_t count = klass->NumVirtualMethods(); 4781 if (!IsUint(16, count)) { 4782 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4783 return false; 4784 } 4785 for (size_t i = 0; i < count; ++i) { 4786 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4787 } 4788 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4789 return false; 4790 } 4791 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4792} 4793 4794// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4795// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4796// caches in the implementation below. 4797class MethodNameAndSignatureComparator FINAL : public ValueObject { 4798 public: 4799 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4800 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4801 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4802 name_(nullptr), name_len_(0) { 4803 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4804 } 4805 4806 const char* GetName() { 4807 if (name_ == nullptr) { 4808 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4809 } 4810 return name_; 4811 } 4812 4813 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4814 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4815 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4816 const DexFile* other_dex_file = other->GetDexFile(); 4817 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4818 if (dex_file_ == other_dex_file) { 4819 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4820 } 4821 GetName(); // Only used to make sure its calculated. 4822 uint32_t other_name_len; 4823 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4824 &other_name_len); 4825 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4826 return false; 4827 } 4828 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4829 } 4830 4831 private: 4832 // Dex file for the method to compare against. 4833 const DexFile* const dex_file_; 4834 // MethodId for the method to compare against. 4835 const DexFile::MethodId* const mid_; 4836 // Lazily computed name from the dex file's strings. 4837 const char* name_; 4838 // Lazily computed name length. 4839 uint32_t name_len_; 4840}; 4841 4842class LinkVirtualHashTable { 4843 public: 4844 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4845 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4846 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4847 } 4848 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4849 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4850 const char* name = local_method->GetName(); 4851 uint32_t hash = ComputeModifiedUtf8Hash(name); 4852 uint32_t index = hash % hash_size_; 4853 // Linear probe until we have an empty slot. 4854 while (hash_table_[index] != invalid_index_) { 4855 if (++index == hash_size_) { 4856 index = 0; 4857 } 4858 } 4859 hash_table_[index] = virtual_method_index; 4860 } 4861 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4862 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4863 const char* name = comparator->GetName(); 4864 uint32_t hash = ComputeModifiedUtf8Hash(name); 4865 size_t index = hash % hash_size_; 4866 while (true) { 4867 const uint32_t value = hash_table_[index]; 4868 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4869 // the block and can safely assume not found. 4870 if (value == invalid_index_) { 4871 break; 4872 } 4873 if (value != removed_index_) { // This signifies not already overriden. 4874 mirror::ArtMethod* virtual_method = 4875 klass_->GetVirtualMethodDuringLinking(value); 4876 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4877 hash_table_[index] = removed_index_; 4878 return value; 4879 } 4880 } 4881 if (++index == hash_size_) { 4882 index = 0; 4883 } 4884 } 4885 return GetNotFoundIndex(); 4886 } 4887 static uint32_t GetNotFoundIndex() { 4888 return invalid_index_; 4889 } 4890 4891 private: 4892 static const uint32_t invalid_index_; 4893 static const uint32_t removed_index_; 4894 4895 Handle<mirror::Class> klass_; 4896 const size_t hash_size_; 4897 uint32_t* const hash_table_; 4898}; 4899 4900const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4901const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4902 4903bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4904 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4905 if (klass->HasSuperClass()) { 4906 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4907 const size_t max_count = num_virtual_methods + super_vtable_length; 4908 StackHandleScope<2> hs(self); 4909 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4910 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4911 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4912 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4913 if (UNLIKELY(vtable.Get() == nullptr)) { 4914 CHECK(self->IsExceptionPending()); // OOME. 4915 return false; 4916 } 4917 for (size_t i = 0; i < super_vtable_length; i++) { 4918 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4919 } 4920 if (num_virtual_methods == 0) { 4921 klass->SetVTable(vtable.Get()); 4922 return true; 4923 } 4924 } else { 4925 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4926 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4927 if (num_virtual_methods == 0) { 4928 klass->SetVTable(super_vtable); 4929 return true; 4930 } 4931 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4932 if (UNLIKELY(vtable.Get() == nullptr)) { 4933 CHECK(self->IsExceptionPending()); // OOME. 4934 return false; 4935 } 4936 } 4937 // How the algorithm works: 4938 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4939 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4940 // method which has not been matched to a vtable method, and j if the virtual method at the 4941 // index overrode the super virtual method at index j. 4942 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4943 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4944 // the need for the initial vtable which we later shrink back down). 4945 // 3. Add non overridden methods to the end of the vtable. 4946 static constexpr size_t kMaxStackHash = 250; 4947 const size_t hash_table_size = num_virtual_methods * 3; 4948 uint32_t* hash_table_ptr; 4949 std::unique_ptr<uint32_t[]> hash_heap_storage; 4950 if (hash_table_size <= kMaxStackHash) { 4951 hash_table_ptr = reinterpret_cast<uint32_t*>( 4952 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4953 } else { 4954 hash_heap_storage.reset(new uint32_t[hash_table_size]); 4955 hash_table_ptr = hash_heap_storage.get(); 4956 } 4957 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 4958 // Add virtual methods to the hash table. 4959 for (size_t i = 0; i < num_virtual_methods; ++i) { 4960 hash_table.Add(i); 4961 } 4962 // Loop through each super vtable method and see if they are overriden by a method we added to 4963 // the hash table. 4964 for (size_t j = 0; j < super_vtable_length; ++j) { 4965 // Search the hash table to see if we are overidden by any method. 4966 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4967 MethodNameAndSignatureComparator super_method_name_comparator( 4968 super_method->GetInterfaceMethodIfProxy()); 4969 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 4970 if (hash_index != hash_table.GetNotFoundIndex()) { 4971 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 4972 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4973 super_method->GetAccessFlags())) { 4974 if (super_method->IsFinal()) { 4975 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4976 PrettyMethod(virtual_method).c_str(), 4977 super_method->GetDeclaringClassDescriptor()); 4978 return false; 4979 } 4980 vtable->SetWithoutChecks<false>(j, virtual_method); 4981 virtual_method->SetMethodIndex(j); 4982 } else { 4983 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 4984 << " would have incorrectly overridden the package-private method in " 4985 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4986 } 4987 } 4988 } 4989 // Add the non overridden methods at the end. 4990 size_t actual_count = super_vtable_length; 4991 for (size_t i = 0; i < num_virtual_methods; ++i) { 4992 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4993 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 4994 if (method_idx < super_vtable_length && 4995 local_method == vtable->GetWithoutChecks(method_idx)) { 4996 continue; 4997 } 4998 vtable->SetWithoutChecks<false>(actual_count, local_method); 4999 local_method->SetMethodIndex(actual_count); 5000 ++actual_count; 5001 } 5002 if (!IsUint(16, actual_count)) { 5003 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 5004 return false; 5005 } 5006 // Shrink vtable if possible 5007 CHECK_LE(actual_count, max_count); 5008 if (actual_count < max_count) { 5009 vtable.Assign(vtable->CopyOf(self, actual_count)); 5010 if (UNLIKELY(vtable.Get() == nullptr)) { 5011 CHECK(self->IsExceptionPending()); // OOME. 5012 return false; 5013 } 5014 } 5015 klass->SetVTable(vtable.Get()); 5016 } else { 5017 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 5018 if (!IsUint(16, num_virtual_methods)) { 5019 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 5020 static_cast<int>(num_virtual_methods)); 5021 return false; 5022 } 5023 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 5024 if (UNLIKELY(vtable == nullptr)) { 5025 CHECK(self->IsExceptionPending()); // OOME. 5026 return false; 5027 } 5028 for (size_t i = 0; i < num_virtual_methods; ++i) { 5029 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 5030 vtable->SetWithoutChecks<false>(i, virtual_method); 5031 virtual_method->SetMethodIndex(i & 0xFFFF); 5032 } 5033 klass->SetVTable(vtable); 5034 } 5035 return true; 5036} 5037 5038bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 5039 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 5040 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 5041 StackHandleScope<3> hs(self); 5042 Runtime* const runtime = Runtime::Current(); 5043 const bool has_superclass = klass->HasSuperClass(); 5044 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 5045 const bool have_interfaces = interfaces.Get() != nullptr; 5046 const size_t num_interfaces = 5047 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 5048 if (num_interfaces == 0) { 5049 if (super_ifcount == 0) { 5050 // Class implements no interfaces. 5051 DCHECK_EQ(klass->GetIfTableCount(), 0); 5052 DCHECK(klass->GetIfTable() == nullptr); 5053 return true; 5054 } 5055 // Class implements same interfaces as parent, are any of these not marker interfaces? 5056 bool has_non_marker_interface = false; 5057 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5058 for (size_t i = 0; i < super_ifcount; ++i) { 5059 if (super_iftable->GetMethodArrayCount(i) > 0) { 5060 has_non_marker_interface = true; 5061 break; 5062 } 5063 } 5064 // Class just inherits marker interfaces from parent so recycle parent's iftable. 5065 if (!has_non_marker_interface) { 5066 klass->SetIfTable(super_iftable); 5067 return true; 5068 } 5069 } 5070 size_t ifcount = super_ifcount + num_interfaces; 5071 for (size_t i = 0; i < num_interfaces; i++) { 5072 mirror::Class* interface = have_interfaces ? 5073 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 5074 DCHECK(interface != nullptr); 5075 if (UNLIKELY(!interface->IsInterface())) { 5076 std::string temp; 5077 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 5078 PrettyDescriptor(klass.Get()).c_str(), 5079 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 5080 return false; 5081 } 5082 ifcount += interface->GetIfTableCount(); 5083 } 5084 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 5085 if (UNLIKELY(iftable.Get() == nullptr)) { 5086 CHECK(self->IsExceptionPending()); // OOME. 5087 return false; 5088 } 5089 if (super_ifcount != 0) { 5090 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5091 for (size_t i = 0; i < super_ifcount; i++) { 5092 mirror::Class* super_interface = super_iftable->GetInterface(i); 5093 iftable->SetInterface(i, super_interface); 5094 } 5095 } 5096 self->AllowThreadSuspension(); 5097 // Flatten the interface inheritance hierarchy. 5098 size_t idx = super_ifcount; 5099 for (size_t i = 0; i < num_interfaces; i++) { 5100 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 5101 mirror::Class::GetDirectInterface(self, klass, i); 5102 // Check if interface is already in iftable 5103 bool duplicate = false; 5104 for (size_t j = 0; j < idx; j++) { 5105 mirror::Class* existing_interface = iftable->GetInterface(j); 5106 if (existing_interface == interface) { 5107 duplicate = true; 5108 break; 5109 } 5110 } 5111 if (!duplicate) { 5112 // Add this non-duplicate interface. 5113 iftable->SetInterface(idx++, interface); 5114 // Add this interface's non-duplicate super-interfaces. 5115 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 5116 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 5117 bool super_duplicate = false; 5118 for (size_t k = 0; k < idx; k++) { 5119 mirror::Class* existing_interface = iftable->GetInterface(k); 5120 if (existing_interface == super_interface) { 5121 super_duplicate = true; 5122 break; 5123 } 5124 } 5125 if (!super_duplicate) { 5126 iftable->SetInterface(idx++, super_interface); 5127 } 5128 } 5129 } 5130 } 5131 self->AllowThreadSuspension(); 5132 // Shrink iftable in case duplicates were found 5133 if (idx < ifcount) { 5134 DCHECK_NE(num_interfaces, 0U); 5135 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 5136 if (UNLIKELY(iftable.Get() == nullptr)) { 5137 CHECK(self->IsExceptionPending()); // OOME. 5138 return false; 5139 } 5140 ifcount = idx; 5141 } else { 5142 DCHECK_EQ(idx, ifcount); 5143 } 5144 klass->SetIfTable(iftable.Get()); 5145 // If we're an interface, we don't need the vtable pointers, so we're done. 5146 if (klass->IsInterface()) { 5147 return true; 5148 } 5149 size_t miranda_list_size = 0; 5150 size_t max_miranda_methods = 0; // The max size of miranda_list. 5151 for (size_t i = 0; i < ifcount; ++i) { 5152 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 5153 } 5154 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 5155 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 5156 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 5157 hs.NewHandle(klass->GetVTableDuringLinking())); 5158 // Copy the IMT from the super class if possible. 5159 bool extend_super_iftable = false; 5160 if (has_superclass) { 5161 mirror::Class* super_class = klass->GetSuperClass(); 5162 extend_super_iftable = true; 5163 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 5164 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 5165 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 5166 } 5167 } else { 5168 // No imt in the super class, need to reconstruct from the iftable. 5169 mirror::IfTable* if_table = super_class->GetIfTable(); 5170 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5171 const size_t length = super_class->GetIfTableCount(); 5172 for (size_t i = 0; i < length; ++i) { 5173 mirror::Class* interface = iftable->GetInterface(i); 5174 const size_t num_virtuals = interface->NumVirtualMethods(); 5175 const size_t method_array_count = if_table->GetMethodArrayCount(i); 5176 DCHECK_EQ(num_virtuals, method_array_count); 5177 if (method_array_count == 0) { 5178 continue; 5179 } 5180 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 5181 for (size_t j = 0; j < num_virtuals; ++j) { 5182 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 5183 if (method->IsMiranda()) { 5184 continue; 5185 } 5186 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 5187 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5188 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5189 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5190 out_imt->SetReference(imt_index, method); 5191 } else if (imt_ref != conflict_method) { 5192 out_imt->SetReference(imt_index, conflict_method); 5193 } 5194 } 5195 } 5196 } 5197 } 5198 for (size_t i = 0; i < ifcount; ++i) { 5199 self->AllowThreadSuspension(); 5200 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 5201 if (num_methods > 0) { 5202 StackHandleScope<2> hs2(self); 5203 const bool is_super = i < super_ifcount; 5204 const bool super_interface = is_super && extend_super_iftable; 5205 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 5206 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 5207 if (super_interface) { 5208 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 5209 DCHECK(if_table != nullptr); 5210 DCHECK(if_table->GetMethodArray(i) != nullptr); 5211 // If we are working on a super interface, try extending the existing method array. 5212 method_array = hs2.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 5213 AsObjectArray<mirror::ArtMethod>()); 5214 // We are overwriting a super class interface, try to only virtual methods instead of the 5215 // whole vtable. 5216 input_array = hs2.NewHandle(klass->GetVirtualMethods()); 5217 } else { 5218 method_array = hs2.NewHandle(AllocArtMethodArray(self, num_methods)); 5219 // A new interface, we need the whole vtable incase a new interface method is implemented 5220 // in the whole superclass. 5221 input_array = vtable; 5222 } 5223 if (UNLIKELY(method_array.Get() == nullptr)) { 5224 CHECK(self->IsExceptionPending()); // OOME. 5225 return false; 5226 } 5227 iftable->SetMethodArray(i, method_array.Get()); 5228 if (input_array.Get() == nullptr) { 5229 // If the added virtual methods is empty, do nothing. 5230 DCHECK(super_interface); 5231 continue; 5232 } 5233 for (size_t j = 0; j < num_methods; ++j) { 5234 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 5235 MethodNameAndSignatureComparator interface_name_comparator( 5236 interface_method->GetInterfaceMethodIfProxy()); 5237 int32_t k; 5238 // For each method listed in the interface's method list, find the 5239 // matching method in our class's method list. We want to favor the 5240 // subclass over the superclass, which just requires walking 5241 // back from the end of the vtable. (This only matters if the 5242 // superclass defines a private method and this class redefines 5243 // it -- otherwise it would use the same vtable slot. In .dex files 5244 // those don't end up in the virtual method table, so it shouldn't 5245 // matter which direction we go. We walk it backward anyway.) 5246 for (k = input_array->GetLength() - 1; k >= 0; --k) { 5247 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 5248 mirror::ArtMethod* vtable_method_for_name_comparison = 5249 vtable_method->GetInterfaceMethodIfProxy(); 5250 if (interface_name_comparator.HasSameNameAndSignature( 5251 vtable_method_for_name_comparison)) { 5252 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 5253 ThrowIllegalAccessError( 5254 klass.Get(), 5255 "Method '%s' implementing interface method '%s' is not public", 5256 PrettyMethod(vtable_method).c_str(), 5257 PrettyMethod(interface_method).c_str()); 5258 return false; 5259 } 5260 method_array->SetWithoutChecks<false>(j, vtable_method); 5261 // Place method in imt if entry is empty, place conflict otherwise. 5262 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5263 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5264 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5265 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5266 out_imt->SetReference(imt_index, vtable_method); 5267 } else if (imt_ref != conflict_method) { 5268 // If we are not a conflict and we have the same signature and name as the imt entry, 5269 // it must be that we overwrote a superclass vtable entry. 5270 MethodNameAndSignatureComparator imt_ref_name_comparator( 5271 imt_ref->GetInterfaceMethodIfProxy()); 5272 if (imt_ref_name_comparator.HasSameNameAndSignature( 5273 vtable_method_for_name_comparison)) { 5274 out_imt->SetReference(imt_index, vtable_method); 5275 } else { 5276 out_imt->SetReference(imt_index, conflict_method); 5277 } 5278 } 5279 break; 5280 } 5281 } 5282 if (k < 0 && !super_interface) { 5283 mirror::ArtMethod* miranda_method = nullptr; 5284 for (size_t l = 0; l < miranda_list_size; ++l) { 5285 mirror::ArtMethod* mir_method = miranda_list->Get(l); 5286 if (interface_name_comparator.HasSameNameAndSignature(mir_method)) { 5287 miranda_method = mir_method; 5288 break; 5289 } 5290 } 5291 if (miranda_method == nullptr) { 5292 // Point the interface table at a phantom slot. 5293 miranda_method = interface_method->Clone(self)->AsArtMethod(); 5294 if (UNLIKELY(miranda_method == nullptr)) { 5295 CHECK(self->IsExceptionPending()); // OOME. 5296 return false; 5297 } 5298 DCHECK_LT(miranda_list_size, max_miranda_methods); 5299 miranda_list->Set<false>(miranda_list_size++, miranda_method); 5300 } 5301 method_array->SetWithoutChecks<false>(j, miranda_method); 5302 } 5303 } 5304 } 5305 } 5306 if (miranda_list_size > 0) { 5307 int old_method_count = klass->NumVirtualMethods(); 5308 int new_method_count = old_method_count + miranda_list_size; 5309 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 5310 if (old_method_count == 0) { 5311 virtuals = AllocArtMethodArray(self, new_method_count); 5312 } else { 5313 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 5314 } 5315 if (UNLIKELY(virtuals == nullptr)) { 5316 CHECK(self->IsExceptionPending()); // OOME. 5317 return false; 5318 } 5319 klass->SetVirtualMethods(virtuals); 5320 5321 int old_vtable_count = vtable->GetLength(); 5322 int new_vtable_count = old_vtable_count + miranda_list_size; 5323 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 5324 if (UNLIKELY(vtable.Get() == nullptr)) { 5325 CHECK(self->IsExceptionPending()); // OOME. 5326 return false; 5327 } 5328 for (size_t i = 0; i < miranda_list_size; ++i) { 5329 mirror::ArtMethod* method = miranda_list->Get(i); 5330 // Leave the declaring class alone as type indices are relative to it 5331 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5332 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5333 klass->SetVirtualMethod(old_method_count + i, method); 5334 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5335 } 5336 // TODO: do not assign to the vtable field until it is fully constructed. 5337 klass->SetVTable(vtable.Get()); 5338 } 5339 5340 if (kIsDebugBuild) { 5341 mirror::ObjectArray<mirror::ArtMethod>* check_vtable = klass->GetVTableDuringLinking(); 5342 for (int i = 0; i < check_vtable->GetLength(); ++i) { 5343 CHECK(check_vtable->GetWithoutChecks(i) != nullptr); 5344 } 5345 } 5346 5347 self->AllowThreadSuspension(); 5348 return true; 5349} 5350 5351bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5352 CHECK(klass.Get() != nullptr); 5353 return LinkFields(self, klass, false, nullptr); 5354} 5355 5356bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5357 CHECK(klass.Get() != nullptr); 5358 return LinkFields(self, klass, true, class_size); 5359} 5360 5361struct LinkFieldsComparator { 5362 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5363 } 5364 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5365 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5366 NO_THREAD_SAFETY_ANALYSIS { 5367 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5368 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5369 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5370 if (type1 != type2) { 5371 if (type1 == Primitive::kPrimNot) { 5372 // Reference always goes first. 5373 return true; 5374 } 5375 if (type2 == Primitive::kPrimNot) { 5376 // Reference always goes first. 5377 return false; 5378 } 5379 size_t size1 = Primitive::ComponentSize(type1); 5380 size_t size2 = Primitive::ComponentSize(type2); 5381 if (size1 != size2) { 5382 // Larger primitive types go first. 5383 return size1 > size2; 5384 } 5385 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 5386 return type1 < type2; 5387 } 5388 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 5389 // by name and for equal names by type id index. 5390 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 5391 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 5392 } 5393}; 5394 5395bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5396 size_t* class_size) { 5397 self->AllowThreadSuspension(); 5398 size_t num_fields = 5399 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5400 5401 mirror::ObjectArray<mirror::ArtField>* fields = 5402 is_static ? klass->GetSFields() : klass->GetIFields(); 5403 5404 // Initialize field_offset 5405 MemberOffset field_offset(0); 5406 if (is_static) { 5407 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 5408 } else { 5409 mirror::Class* super_class = klass->GetSuperClass(); 5410 if (super_class != nullptr) { 5411 CHECK(super_class->IsResolved()) 5412 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5413 field_offset = MemberOffset(super_class->GetObjectSize()); 5414 } 5415 } 5416 5417 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5418 5419 // we want a relatively stable order so that adding new fields 5420 // minimizes disruption of C++ version such as Class and Method. 5421 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5422 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5423 "Naked ArtField references in deque"); 5424 for (size_t i = 0; i < num_fields; i++) { 5425 mirror::ArtField* f = fields->Get(i); 5426 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5427 grouped_and_sorted_fields.push_back(f); 5428 } 5429 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5430 LinkFieldsComparator()); 5431 5432 // References should be at the front. 5433 size_t current_field = 0; 5434 size_t num_reference_fields = 0; 5435 FieldGaps gaps; 5436 5437 for (; current_field < num_fields; current_field++) { 5438 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5439 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5440 bool isPrimitive = type != Primitive::kPrimNot; 5441 if (isPrimitive) { 5442 break; // past last reference, move on to the next phase 5443 } 5444 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>( 5445 field_offset.Uint32Value()))) { 5446 MemberOffset old_offset = field_offset; 5447 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5448 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5449 } 5450 DCHECK(IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(field_offset.Uint32Value())); 5451 grouped_and_sorted_fields.pop_front(); 5452 num_reference_fields++; 5453 field->SetOffset(field_offset); 5454 field_offset = MemberOffset(field_offset.Uint32Value() + 5455 sizeof(mirror::HeapReference<mirror::Object>)); 5456 } 5457 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5458 // otherwise we could end up with suboptimal gap fills. 5459 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5460 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5461 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5462 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5463 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5464 " fields."; 5465 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5466 5467 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5468 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5469 // We know there are no non-reference fields in the Reference classes, and we know 5470 // that 'referent' is alphabetically last, so this is easy... 5471 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5472 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5473 --num_reference_fields; 5474 } 5475 5476 size_t size = field_offset.Uint32Value(); 5477 // Update klass 5478 if (is_static) { 5479 klass->SetNumReferenceStaticFields(num_reference_fields); 5480 *class_size = size; 5481 } else { 5482 klass->SetNumReferenceInstanceFields(num_reference_fields); 5483 if (!klass->IsVariableSize()) { 5484 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 5485 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 5486 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 5487 } else { 5488 std::string temp; 5489 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5490 size_t previous_size = klass->GetObjectSize(); 5491 if (previous_size != 0) { 5492 // Make sure that we didn't originally have an incorrect size. 5493 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5494 } 5495 klass->SetObjectSize(size); 5496 } 5497 } 5498 } 5499 5500 if (kIsDebugBuild) { 5501 // Make sure that the fields array is ordered by name but all reference 5502 // offsets are at the beginning as far as alignment allows. 5503 MemberOffset start_ref_offset = is_static 5504 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 5505 : klass->GetFirstReferenceInstanceFieldOffset(); 5506 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 5507 num_reference_fields * 5508 sizeof(mirror::HeapReference<mirror::Object>)); 5509 MemberOffset current_ref_offset = start_ref_offset; 5510 for (size_t i = 0; i < num_fields; i++) { 5511 mirror::ArtField* field = fields->Get(i); 5512 if ((false)) { // enable to debug field layout 5513 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5514 << " class=" << PrettyClass(klass.Get()) 5515 << " field=" << PrettyField(field) 5516 << " offset=" 5517 << field->GetField32(mirror::ArtField::OffsetOffset()); 5518 } 5519 if (i != 0) { 5520 mirror::ArtField* prev_field = fields->Get(i - 1u); 5521 // NOTE: The field names can be the same. This is not possible in the Java language 5522 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 5523 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 5524 } 5525 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5526 bool is_primitive = type != Primitive::kPrimNot; 5527 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5528 strcmp("referent", field->GetName()) == 0) { 5529 is_primitive = true; // We lied above, so we have to expect a lie here. 5530 } 5531 MemberOffset offset = field->GetOffsetDuringLinking(); 5532 if (is_primitive) { 5533 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 5534 // Shuffled before references. 5535 size_t type_size = Primitive::ComponentSize(type); 5536 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 5537 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 5538 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 5539 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 5540 } 5541 } else { 5542 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 5543 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 5544 sizeof(mirror::HeapReference<mirror::Object>)); 5545 } 5546 } 5547 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 5548 } 5549 return true; 5550} 5551 5552// Set the bitmap of reference instance field offsets. 5553void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5554 uint32_t reference_offsets = 0; 5555 mirror::Class* super_class = klass->GetSuperClass(); 5556 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5557 if (super_class != nullptr) { 5558 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5559 // Compute reference offsets unless our superclass overflowed. 5560 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5561 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5562 if (num_reference_fields != 0u) { 5563 // All of the fields that contain object references are guaranteed be grouped in memory 5564 // starting at an appropriately aligned address after super class object data. 5565 uint32_t start_offset = RoundUp(super_class->GetObjectSize(), 5566 sizeof(mirror::HeapReference<mirror::Object>)); 5567 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) / 5568 sizeof(mirror::HeapReference<mirror::Object>); 5569 if (start_bit + num_reference_fields > 32) { 5570 reference_offsets = mirror::Class::kClassWalkSuper; 5571 } else { 5572 reference_offsets |= (0xffffffffu << start_bit) & 5573 (0xffffffffu >> (32 - (start_bit + num_reference_fields))); 5574 } 5575 } 5576 } 5577 } 5578 klass->SetReferenceInstanceOffsets(reference_offsets); 5579} 5580 5581mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5582 Handle<mirror::DexCache> dex_cache) { 5583 DCHECK(dex_cache.Get() != nullptr); 5584 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5585 if (resolved != nullptr) { 5586 return resolved; 5587 } 5588 uint32_t utf16_length; 5589 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5590 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5591 dex_cache->SetResolvedString(string_idx, string); 5592 return string; 5593} 5594 5595mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5596 mirror::Class* referrer) { 5597 StackHandleScope<2> hs(Thread::Current()); 5598 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5599 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5600 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5601} 5602 5603mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5604 Handle<mirror::DexCache> dex_cache, 5605 Handle<mirror::ClassLoader> class_loader) { 5606 DCHECK(dex_cache.Get() != nullptr); 5607 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5608 if (resolved == nullptr) { 5609 Thread* self = Thread::Current(); 5610 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5611 resolved = FindClass(self, descriptor, class_loader); 5612 if (resolved != nullptr) { 5613 // TODO: we used to throw here if resolved's class loader was not the 5614 // boot class loader. This was to permit different classes with the 5615 // same name to be loaded simultaneously by different loaders 5616 dex_cache->SetResolvedType(type_idx, resolved); 5617 } else { 5618 CHECK(self->IsExceptionPending()) 5619 << "Expected pending exception for failed resolution of: " << descriptor; 5620 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5621 StackHandleScope<1> hs(self); 5622 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5623 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5624 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5625 self->ClearException(); 5626 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5627 self->GetException(nullptr)->SetCause(cause.Get()); 5628 } 5629 } 5630 } 5631 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5632 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5633 return resolved; 5634} 5635 5636mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5637 Handle<mirror::DexCache> dex_cache, 5638 Handle<mirror::ClassLoader> class_loader, 5639 Handle<mirror::ArtMethod> referrer, 5640 InvokeType type) { 5641 DCHECK(dex_cache.Get() != nullptr); 5642 // Check for hit in the dex cache. 5643 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5644 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5645 return resolved; 5646 } 5647 // Fail, get the declaring class. 5648 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5649 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5650 if (klass == nullptr) { 5651 DCHECK(Thread::Current()->IsExceptionPending()); 5652 return nullptr; 5653 } 5654 // Scan using method_idx, this saves string compares but will only hit for matching dex 5655 // caches/files. 5656 switch (type) { 5657 case kDirect: // Fall-through. 5658 case kStatic: 5659 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5660 break; 5661 case kInterface: 5662 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5663 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5664 break; 5665 case kSuper: // Fall-through. 5666 case kVirtual: 5667 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5668 break; 5669 default: 5670 LOG(FATAL) << "Unreachable - invocation type: " << type; 5671 UNREACHABLE(); 5672 } 5673 if (resolved == nullptr) { 5674 // Search by name, which works across dex files. 5675 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5676 const Signature signature = dex_file.GetMethodSignature(method_id); 5677 switch (type) { 5678 case kDirect: // Fall-through. 5679 case kStatic: 5680 resolved = klass->FindDirectMethod(name, signature); 5681 break; 5682 case kInterface: 5683 resolved = klass->FindInterfaceMethod(name, signature); 5684 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5685 break; 5686 case kSuper: // Fall-through. 5687 case kVirtual: 5688 resolved = klass->FindVirtualMethod(name, signature); 5689 break; 5690 } 5691 } 5692 // If we found a method, check for incompatible class changes. 5693 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5694 // Be a good citizen and update the dex cache to speed subsequent calls. 5695 dex_cache->SetResolvedMethod(method_idx, resolved); 5696 return resolved; 5697 } else { 5698 // If we had a method, it's an incompatible-class-change error. 5699 if (resolved != nullptr) { 5700 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5701 } else { 5702 // We failed to find the method which means either an access error, an incompatible class 5703 // change, or no such method. First try to find the method among direct and virtual methods. 5704 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5705 const Signature signature = dex_file.GetMethodSignature(method_id); 5706 switch (type) { 5707 case kDirect: 5708 case kStatic: 5709 resolved = klass->FindVirtualMethod(name, signature); 5710 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5711 // have had a resolved method before, which triggers the "true" branch above. 5712 break; 5713 case kInterface: 5714 case kVirtual: 5715 case kSuper: 5716 resolved = klass->FindDirectMethod(name, signature); 5717 break; 5718 } 5719 5720 // If we found something, check that it can be accessed by the referrer. 5721 bool exception_generated = false; 5722 if (resolved != nullptr && referrer.Get() != nullptr) { 5723 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5724 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5725 if (!referring_class->CanAccess(methods_class)) { 5726 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5727 resolved, type); 5728 exception_generated = true; 5729 } else if (!referring_class->CanAccessMember(methods_class, 5730 resolved->GetAccessFlags())) { 5731 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5732 exception_generated = true; 5733 } 5734 } 5735 if (!exception_generated) { 5736 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check 5737 // interface methods and throw if we find the method there. If we find nothing, throw a 5738 // NoSuchMethodError. 5739 switch (type) { 5740 case kDirect: 5741 case kStatic: 5742 if (resolved != nullptr) { 5743 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5744 } else { 5745 resolved = klass->FindInterfaceMethod(name, signature); 5746 if (resolved != nullptr) { 5747 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5748 } else { 5749 ThrowNoSuchMethodError(type, klass, name, signature); 5750 } 5751 } 5752 break; 5753 case kInterface: 5754 if (resolved != nullptr) { 5755 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5756 } else { 5757 resolved = klass->FindVirtualMethod(name, signature); 5758 if (resolved != nullptr) { 5759 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5760 } else { 5761 ThrowNoSuchMethodError(type, klass, name, signature); 5762 } 5763 } 5764 break; 5765 case kSuper: 5766 if (resolved != nullptr) { 5767 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5768 } else { 5769 ThrowNoSuchMethodError(type, klass, name, signature); 5770 } 5771 break; 5772 case kVirtual: 5773 if (resolved != nullptr) { 5774 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5775 } else { 5776 resolved = klass->FindInterfaceMethod(name, signature); 5777 if (resolved != nullptr) { 5778 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5779 } else { 5780 ThrowNoSuchMethodError(type, klass, name, signature); 5781 } 5782 } 5783 break; 5784 } 5785 } 5786 } 5787 Thread::Current()->AssertPendingException(); 5788 return nullptr; 5789 } 5790} 5791 5792mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5793 Handle<mirror::DexCache> dex_cache, 5794 Handle<mirror::ClassLoader> class_loader, 5795 bool is_static) { 5796 DCHECK(dex_cache.Get() != nullptr); 5797 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5798 if (resolved != nullptr) { 5799 return resolved; 5800 } 5801 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5802 Thread* const self = Thread::Current(); 5803 StackHandleScope<1> hs(self); 5804 Handle<mirror::Class> klass( 5805 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5806 if (klass.Get() == nullptr) { 5807 DCHECK(Thread::Current()->IsExceptionPending()); 5808 return nullptr; 5809 } 5810 5811 if (is_static) { 5812 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5813 } else { 5814 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5815 } 5816 5817 if (resolved == nullptr) { 5818 const char* name = dex_file.GetFieldName(field_id); 5819 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5820 if (is_static) { 5821 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5822 } else { 5823 resolved = klass->FindInstanceField(name, type); 5824 } 5825 if (resolved == nullptr) { 5826 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5827 return nullptr; 5828 } 5829 } 5830 dex_cache->SetResolvedField(field_idx, resolved); 5831 return resolved; 5832} 5833 5834mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5835 uint32_t field_idx, 5836 Handle<mirror::DexCache> dex_cache, 5837 Handle<mirror::ClassLoader> class_loader) { 5838 DCHECK(dex_cache.Get() != nullptr); 5839 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5840 if (resolved != nullptr) { 5841 return resolved; 5842 } 5843 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5844 Thread* self = Thread::Current(); 5845 StackHandleScope<1> hs(self); 5846 Handle<mirror::Class> klass( 5847 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5848 if (klass.Get() == nullptr) { 5849 DCHECK(Thread::Current()->IsExceptionPending()); 5850 return nullptr; 5851 } 5852 5853 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5854 StringPiece type(dex_file.StringDataByIdx( 5855 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5856 resolved = mirror::Class::FindField(self, klass, name, type); 5857 if (resolved != nullptr) { 5858 dex_cache->SetResolvedField(field_idx, resolved); 5859 } else { 5860 ThrowNoSuchFieldError("", klass.Get(), type, name); 5861 } 5862 return resolved; 5863} 5864 5865const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5866 uint32_t* length) { 5867 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5868 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5869 const DexFile& dex_file = *dex_cache->GetDexFile(); 5870 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5871 return dex_file.GetMethodShorty(method_id, length); 5872} 5873 5874void ClassLinker::DumpAllClasses(int flags) { 5875 if (dex_cache_image_class_lookup_required_) { 5876 MoveImageClassesToClassTable(); 5877 } 5878 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5879 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5880 std::vector<mirror::Class*> all_classes; 5881 { 5882 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5883 for (GcRoot<mirror::Class>& it : class_table_) { 5884 all_classes.push_back(it.Read()); 5885 } 5886 } 5887 5888 for (size_t i = 0; i < all_classes.size(); ++i) { 5889 all_classes[i]->DumpClass(std::cerr, flags); 5890 } 5891} 5892 5893static OatFile::OatMethod CreateOatMethod(const void* code) { 5894 CHECK(code != nullptr); 5895 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5896 base -= sizeof(void*); // Move backward so that code_offset != 0. 5897 const uint32_t code_offset = sizeof(void*); 5898 return OatFile::OatMethod(base, code_offset); 5899} 5900 5901bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5902 return (entry_point == GetQuickResolutionStub()) || 5903 (quick_resolution_trampoline_ == entry_point); 5904} 5905 5906bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5907 return (entry_point == GetQuickToInterpreterBridge()) || 5908 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5909} 5910 5911bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5912 return (entry_point == GetQuickGenericJniStub()) || 5913 (quick_generic_jni_trampoline_ == entry_point); 5914} 5915 5916const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5917 return GetQuickGenericJniStub(); 5918} 5919 5920void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, 5921 const void* method_code) const { 5922 OatFile::OatMethod oat_method = CreateOatMethod(method_code); 5923 oat_method.LinkMethod(method); 5924 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5925} 5926 5927void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5928 if (!method->IsNative()) { 5929 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5930 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5931 } else { 5932 const void* quick_method_code = GetQuickGenericJniStub(); 5933 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code); 5934 oat_method.LinkMethod(method); 5935 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5936 } 5937} 5938 5939void ClassLinker::DumpForSigQuit(std::ostream& os) { 5940 Thread* self = Thread::Current(); 5941 if (dex_cache_image_class_lookup_required_) { 5942 ScopedObjectAccess soa(self); 5943 MoveImageClassesToClassTable(); 5944 } 5945 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5946 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5947 << class_table_.Size() << "\n"; 5948} 5949 5950size_t ClassLinker::NumLoadedClasses() { 5951 if (dex_cache_image_class_lookup_required_) { 5952 MoveImageClassesToClassTable(); 5953 } 5954 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5955 // Only return non zygote classes since these are the ones which apps which care about. 5956 return class_table_.Size(); 5957} 5958 5959pid_t ClassLinker::GetClassesLockOwner() { 5960 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5961} 5962 5963pid_t ClassLinker::GetDexLockOwner() { 5964 return dex_lock_.GetExclusiveOwnerTid(); 5965} 5966 5967void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5968 DCHECK(!init_done_); 5969 5970 DCHECK(klass != nullptr); 5971 DCHECK(klass->GetClassLoader() == nullptr); 5972 5973 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5974 DCHECK(class_roots != nullptr); 5975 DCHECK(class_roots->Get(class_root) == nullptr); 5976 class_roots->Set<false>(class_root, klass); 5977} 5978 5979const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5980 static const char* class_roots_descriptors[] = { 5981 "Ljava/lang/Class;", 5982 "Ljava/lang/Object;", 5983 "[Ljava/lang/Class;", 5984 "[Ljava/lang/Object;", 5985 "Ljava/lang/String;", 5986 "Ljava/lang/DexCache;", 5987 "Ljava/lang/ref/Reference;", 5988 "Ljava/lang/reflect/ArtField;", 5989 "Ljava/lang/reflect/ArtMethod;", 5990 "Ljava/lang/reflect/Proxy;", 5991 "[Ljava/lang/String;", 5992 "[Ljava/lang/reflect/ArtField;", 5993 "[Ljava/lang/reflect/ArtMethod;", 5994 "Ljava/lang/ClassLoader;", 5995 "Ljava/lang/Throwable;", 5996 "Ljava/lang/ClassNotFoundException;", 5997 "Ljava/lang/StackTraceElement;", 5998 "Z", 5999 "B", 6000 "C", 6001 "D", 6002 "F", 6003 "I", 6004 "J", 6005 "S", 6006 "V", 6007 "[Z", 6008 "[B", 6009 "[C", 6010 "[D", 6011 "[F", 6012 "[I", 6013 "[J", 6014 "[S", 6015 "[Ljava/lang/StackTraceElement;", 6016 }; 6017 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 6018 "Mismatch between class descriptors and class-root enum"); 6019 6020 const char* descriptor = class_roots_descriptors[class_root]; 6021 CHECK(descriptor != nullptr); 6022 return descriptor; 6023} 6024 6025std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 6026 const { 6027 std::string temp; 6028 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 6029} 6030 6031bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 6032 const GcRoot<mirror::Class>& b) { 6033 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 6034 return false; 6035 } 6036 std::string temp; 6037 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 6038} 6039 6040std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 6041 const std::pair<const char*, mirror::ClassLoader*>& element) const { 6042 return ComputeModifiedUtf8Hash(element.first); 6043} 6044 6045bool ClassLinker::ClassDescriptorHashEquals::operator()( 6046 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) { 6047 if (a.Read()->GetClassLoader() != b.second) { 6048 return false; 6049 } 6050 return a.Read()->DescriptorEquals(b.first); 6051} 6052 6053bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 6054 const char* descriptor) { 6055 return a.Read()->DescriptorEquals(descriptor); 6056} 6057 6058std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 6059 return ComputeModifiedUtf8Hash(descriptor); 6060} 6061 6062bool ClassLinker::MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m) { 6063 // Non-image methods don't use direct code pointer. 6064 if (!m->GetDeclaringClass()->IsBootStrapClassLoaded()) { 6065 return false; 6066 } 6067 if (m->IsPrivate()) { 6068 // The method can only be called inside its own oat file. Therefore it won't be called using 6069 // its direct code if the oat file has been compiled in PIC mode. 6070 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 6071 const DexFile& dex_file = m->GetDeclaringClass()->GetDexFile(); 6072 const OatFile::OatDexFile* oat_dex_file = class_linker->FindOpenedOatDexFileForDexFile(dex_file); 6073 if (oat_dex_file == nullptr) { 6074 // No oat file: the method has not been compiled. 6075 return false; 6076 } 6077 const OatFile* oat_file = oat_dex_file->GetOatFile(); 6078 return oat_file != nullptr && !oat_file->IsPic(); 6079 } else { 6080 // The method can be called outside its own oat file. Therefore it won't be called using its 6081 // direct code pointer only if all loaded oat files have been compiled in PIC mode. 6082 ReaderMutexLock mu(Thread::Current(), dex_lock_); 6083 for (const OatFile* oat_file : oat_files_) { 6084 if (!oat_file->IsPic()) { 6085 return true; 6086 } 6087 } 6088 return false; 6089 } 6090} 6091 6092} // namespace art 6093