class_linker.cc revision 956af0f0cb05422e38c1d22cbef309d16b8a1a12
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(const std::vector<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 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 381 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 382 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 383 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 384 385 // Set up array classes for string, field, method 386 Handle<mirror::Class> object_array_string(hs.NewHandle( 387 AllocClass(self, java_lang_Class.Get(), 388 mirror::ObjectArray<mirror::String>::ClassSize()))); 389 object_array_string->SetComponentType(java_lang_String.Get()); 390 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 391 392 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 393 AllocClass(self, java_lang_Class.Get(), 394 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 395 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 396 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 397 398 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 399 AllocClass(self, java_lang_Class.Get(), 400 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 401 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 402 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 403 404 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 405 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 406 // these roots. 407 CHECK_NE(0U, boot_class_path.size()); 408 for (const DexFile* dex_file : boot_class_path) { 409 CHECK(dex_file != nullptr); 410 AppendToBootClassPath(self, *dex_file); 411 } 412 413 // now we can use FindSystemClass 414 415 // run char class through InitializePrimitiveClass to finish init 416 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 417 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 418 419 // Create runtime resolution and imt conflict methods. Also setup the default imt. 420 Runtime* runtime = Runtime::Current(); 421 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 422 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 423 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 424 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 425 426 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 427 // we do not need friend classes or a publicly exposed setter. 428 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 429 if (!runtime->IsCompiler()) { 430 // We need to set up the generic trampolines since we don't have an image. 431 quick_resolution_trampoline_ = GetQuickResolutionStub(); 432 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 433 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 434 } 435 436 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 437 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 438 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 439 CHECK_EQ(java_lang_Object.Get(), Object_class); 440 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 441 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 442 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 443 std::ostringstream os1, os2; 444 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 445 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 446 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 447 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 448 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 449 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 450 CHECK_EQ(java_lang_String.Get(), String_class); 451 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 452 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 453 454 // Setup the primitive array type classes - can't be done until Object has a vtable. 455 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 456 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 457 458 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 459 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 460 461 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 462 CHECK_EQ(char_array_class.Get(), found_char_array_class); 463 464 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 465 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 466 467 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 468 CHECK_EQ(int_array_class.Get(), found_int_array_class); 469 470 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 471 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 472 473 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 474 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 475 476 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 477 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 478 479 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 480 CHECK_EQ(class_array_class.Get(), found_class_array_class); 481 482 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 483 CHECK_EQ(object_array_class.Get(), found_object_array_class); 484 485 // Setup the single, global copy of "iftable". 486 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 487 CHECK(java_lang_Cloneable != nullptr); 488 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 489 CHECK(java_io_Serializable != nullptr); 490 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 491 // crawl up and explicitly list all of the supers as well. 492 { 493 mirror::IfTable* array_iftable = array_iftable_.Read(); 494 array_iftable->SetInterface(0, java_lang_Cloneable); 495 array_iftable->SetInterface(1, java_io_Serializable); 496 } 497 498 // Sanity check Class[] and Object[]'s interfaces. 499 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 500 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 501 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 502 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 503 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 504 // dex_cache_ fields and register them in class_table_. 505 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 506 CHECK_EQ(java_lang_Class.Get(), Class_class); 507 508 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 509 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 510 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 511 512 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 513 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 514 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 515 516 mirror::Class* String_array_class = 517 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 518 CHECK_EQ(object_array_string.Get(), String_array_class); 519 520 mirror::Class* Art_method_array_class = 521 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 522 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 523 524 mirror::Class* Art_field_array_class = 525 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 526 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 527 528 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 529 530 // Create java.lang.reflect.Proxy root. 531 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 532 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 533 534 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 535 // finish initializing Reference class 536 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 537 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 538 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 539 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 540 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 541 mirror::Class* java_lang_ref_FinalizerReference = 542 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 543 java_lang_ref_FinalizerReference->SetAccessFlags( 544 java_lang_ref_FinalizerReference->GetAccessFlags() | 545 kAccClassIsReference | kAccClassIsFinalizerReference); 546 mirror::Class* java_lang_ref_PhantomReference = 547 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 548 java_lang_ref_PhantomReference->SetAccessFlags( 549 java_lang_ref_PhantomReference->GetAccessFlags() | 550 kAccClassIsReference | kAccClassIsPhantomReference); 551 mirror::Class* java_lang_ref_SoftReference = 552 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 553 java_lang_ref_SoftReference->SetAccessFlags( 554 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 555 mirror::Class* java_lang_ref_WeakReference = 556 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 557 java_lang_ref_WeakReference->SetAccessFlags( 558 java_lang_ref_WeakReference->GetAccessFlags() | 559 kAccClassIsReference | kAccClassIsWeakReference); 560 561 // Setup the ClassLoader, verifying the object_size_. 562 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 563 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 564 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 565 566 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 567 // java.lang.StackTraceElement as a convenience. 568 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 569 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 570 SetClassRoot(kJavaLangClassNotFoundException, 571 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 572 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 573 SetClassRoot(kJavaLangStackTraceElementArrayClass, 574 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 575 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 576 577 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly 578 // initialized. 579 { 580 const DexFile& dex_file = java_lang_Object->GetDexFile(); 581 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 582 CHECK(void_string_id != nullptr); 583 uint32_t void_string_index = dex_file.GetIndexForStringId(*void_string_id); 584 const DexFile::TypeId* void_type_id = dex_file.FindTypeId(void_string_index); 585 CHECK(void_type_id != nullptr); 586 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id); 587 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class 588 // as referrer so the used dex cache is core's one. 589 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get()); 590 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid)); 591 self->AssertNoPendingException(); 592 } 593 594 FinishInit(self); 595 596 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 597} 598 599void ClassLinker::FinishInit(Thread* self) { 600 VLOG(startup) << "ClassLinker::FinishInit entering"; 601 602 // Let the heap know some key offsets into java.lang.ref instances 603 // Note: we hard code the field indexes here rather than using FindInstanceField 604 // as the types of the field can't be resolved prior to the runtime being 605 // fully initialized 606 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 607 mirror::Class* java_lang_ref_FinalizerReference = 608 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 609 610 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 611 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 612 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 613 614 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 615 CHECK_STREQ(queue->GetName(), "queue"); 616 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 617 618 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 619 CHECK_STREQ(queueNext->GetName(), "queueNext"); 620 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 621 622 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 623 CHECK_STREQ(referent->GetName(), "referent"); 624 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 625 626 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 627 CHECK_STREQ(zombie->GetName(), "zombie"); 628 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 629 630 // ensure all class_roots_ are initialized 631 for (size_t i = 0; i < kClassRootsMax; i++) { 632 ClassRoot class_root = static_cast<ClassRoot>(i); 633 mirror::Class* klass = GetClassRoot(class_root); 634 CHECK(klass != nullptr); 635 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 636 // note SetClassRoot does additional validation. 637 // if possible add new checks there to catch errors early 638 } 639 640 CHECK(!array_iftable_.IsNull()); 641 642 // disable the slow paths in FindClass and CreatePrimitiveClass now 643 // that Object, Class, and Object[] are setup 644 init_done_ = true; 645 646 VLOG(startup) << "ClassLinker::FinishInit exiting"; 647} 648 649void ClassLinker::RunRootClinits() { 650 Thread* self = Thread::Current(); 651 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 652 mirror::Class* c = GetClassRoot(ClassRoot(i)); 653 if (!c->IsArrayClass() && !c->IsPrimitive()) { 654 StackHandleScope<1> hs(self); 655 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 656 EnsureInitialized(self, h_class, true, true); 657 self->AssertNoPendingException(); 658 } 659 } 660} 661 662bool ClassLinker::GenerateOatFile(const char* dex_filename, 663 int oat_fd, 664 const char* oat_cache_filename, 665 std::string* error_msg) { 666 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 667 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 668 669 gc::Heap* heap = Runtime::Current()->GetHeap(); 670 std::string boot_image_option("--boot-image="); 671 if (heap->GetImageSpace() == nullptr) { 672 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 673 // out of space anyway it might not matter. 674 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 675 "without an image.", dex_filename); 676 return false; 677 } 678 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 679 680 std::string dex_file_option("--dex-file="); 681 dex_file_option += dex_filename; 682 683 std::string oat_fd_option("--oat-fd="); 684 StringAppendF(&oat_fd_option, "%d", oat_fd); 685 686 std::string oat_location_option("--oat-location="); 687 oat_location_option += oat_cache_filename; 688 689 std::vector<std::string> argv; 690 argv.push_back(dex2oat); 691 argv.push_back("--runtime-arg"); 692 argv.push_back("-classpath"); 693 argv.push_back("--runtime-arg"); 694 argv.push_back(Runtime::Current()->GetClassPathString()); 695 696 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 697 698 if (!Runtime::Current()->IsVerificationEnabled()) { 699 argv.push_back("--compiler-filter=verify-none"); 700 } 701 702 if (Runtime::Current()->MustRelocateIfPossible()) { 703 argv.push_back("--runtime-arg"); 704 argv.push_back("-Xrelocate"); 705 } else { 706 argv.push_back("--runtime-arg"); 707 argv.push_back("-Xnorelocate"); 708 } 709 710 if (!kIsTargetBuild) { 711 argv.push_back("--host"); 712 } 713 714 argv.push_back(boot_image_option); 715 argv.push_back(dex_file_option); 716 argv.push_back(oat_fd_option); 717 argv.push_back(oat_location_option); 718 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 719 for (size_t i = 0; i < compiler_options.size(); ++i) { 720 argv.push_back(compiler_options[i].c_str()); 721 } 722 723 if (!Exec(argv, error_msg)) { 724 // Manually delete the file. Ensures there is no garbage left over if the process unexpectedly 725 // died. Ignore unlink failure, propagate the original error. 726 TEMP_FAILURE_RETRY(unlink(oat_cache_filename)); 727 return false; 728 } 729 730 return true; 731} 732 733const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 734 WriterMutexLock mu(Thread::Current(), dex_lock_); 735 if (kIsDebugBuild) { 736 for (size_t i = 0; i < oat_files_.size(); ++i) { 737 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 738 } 739 } 740 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 741 oat_files_.push_back(oat_file); 742 return oat_file; 743} 744 745OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 746 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 747 OatFile* oat_file = space->ReleaseOatFile(); 748 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 749 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 750 return *oat_file; 751} 752 753const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 754 const char* dex_location = dex_file.GetLocation().c_str(); 755 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 756 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 757} 758 759const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 760 const char* dex_location, 761 const uint32_t* dex_location_checksum) { 762 ReaderMutexLock mu(Thread::Current(), dex_lock_); 763 for (const OatFile* oat_file : oat_files_) { 764 DCHECK(oat_file != nullptr); 765 766 if (oat_location != nullptr) { 767 if (oat_file->GetLocation() != oat_location) { 768 continue; 769 } 770 } 771 772 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 773 dex_location_checksum, 774 false); 775 if (oat_dex_file != nullptr) { 776 return oat_dex_file; 777 } 778 } 779 return nullptr; 780} 781 782 783// Loads all multi dex files from the given oat file returning true on success. 784// 785// Parameters: 786// oat_file - the oat file to load from 787// dex_location - the dex location used to generate the oat file 788// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 789// generated - whether or not the oat_file existed before or was just (re)generated 790// error_msgs - any error messages will be appended here 791// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 792static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 793 const char* dex_location, 794 const uint32_t* dex_location_checksum, 795 bool generated, 796 std::vector<std::string>* error_msgs, 797 std::vector<const DexFile*>* dex_files) { 798 if (oat_file == nullptr) { 799 return false; 800 } 801 802 size_t old_size = dex_files->size(); // To rollback on error. 803 804 bool success = true; 805 for (size_t i = 0; success; ++i) { 806 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 807 const char* next_name = next_name_str.c_str(); 808 809 uint32_t next_location_checksum; 810 uint32_t* next_location_checksum_pointer = &next_location_checksum; 811 std::string error_msg; 812 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 813 // When i=0 the multidex name should be the same as the location name. We already have the 814 // checksum it so we don't need to recompute it. 815 if (dex_location_checksum == nullptr) { 816 next_location_checksum_pointer = nullptr; 817 } else { 818 next_location_checksum = *dex_location_checksum; 819 } 820 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 821 DCHECK_EQ(false, i == 0 && generated); 822 next_location_checksum_pointer = nullptr; 823 } 824 825 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 826 827 if (oat_dex_file == nullptr) { 828 if (i == 0 && generated) { 829 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 830 " file'%s'", dex_location, next_location_checksum, 831 oat_file->GetLocation().c_str()); 832 error_msgs->push_back(error_msg); 833 } 834 break; // Not found, done. 835 } 836 837 // Checksum test. Test must succeed when generated. 838 success = !generated; 839 if (next_location_checksum_pointer != nullptr) { 840 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 841 } 842 843 if (success) { 844 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 845 if (dex_file == nullptr) { 846 success = false; 847 error_msgs->push_back(error_msg); 848 } else { 849 dex_files->push_back(dex_file); 850 } 851 } 852 853 // When we generated the file, we expect success, or something is terribly wrong. 854 CHECK_EQ(false, generated && !success) 855 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 856 << std::hex << " dex_location_checksum=" << next_location_checksum 857 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 858 } 859 860 if (dex_files->size() == old_size) { 861 success = false; // We did not even find classes.dex 862 } 863 864 if (success) { 865 return true; 866 } else { 867 // Free all the dex files we have loaded. 868 auto it = dex_files->begin() + old_size; 869 auto it_end = dex_files->end(); 870 for (; it != it_end; it++) { 871 delete *it; 872 } 873 dex_files->erase(dex_files->begin() + old_size, it_end); 874 875 return false; 876 } 877} 878 879// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 880// complicates the loading process, as we should not use an iterative loading process, because that 881// would register the oat file and dex files that come before the broken one. Instead, check all 882// multidex ahead of time. 883bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 884 std::vector<std::string>* error_msgs, 885 std::vector<const DexFile*>* dex_files) { 886 // 1) Check whether we have an open oat file. 887 // This requires a dex checksum, use the "primary" one. 888 uint32_t dex_location_checksum; 889 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 890 bool have_checksum = true; 891 std::string checksum_error_msg; 892 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 893 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 894 dex_location_checksum_pointer = nullptr; 895 have_checksum = false; 896 } 897 898 bool needs_registering = false; 899 900 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 901 dex_location_checksum_pointer); 902 std::unique_ptr<const OatFile> open_oat_file( 903 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 904 905 // 2) If we do not have an open one, maybe there's one on disk already. 906 907 // In case the oat file is not open, we play a locking game here so 908 // that if two different processes race to load and register or generate 909 // (or worse, one tries to open a partial generated file) we will be okay. 910 // This is actually common with apps that use DexClassLoader to work 911 // around the dex method reference limit and that have a background 912 // service running in a separate process. 913 ScopedFlock scoped_flock; 914 915 if (open_oat_file.get() == nullptr) { 916 if (oat_location != nullptr) { 917 // Can only do this if we have a checksum, else error. 918 if (!have_checksum) { 919 error_msgs->push_back(checksum_error_msg); 920 return false; 921 } 922 923 std::string error_msg; 924 925 // We are loading or creating one in the future. Time to set up the file lock. 926 if (!scoped_flock.Init(oat_location, &error_msg)) { 927 error_msgs->push_back(error_msg); 928 return false; 929 } 930 931 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 932 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 933 oat_location, &error_msg)); 934 935 if (open_oat_file.get() == nullptr) { 936 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 937 dex_location, oat_location, error_msg.c_str()); 938 VLOG(class_linker) << compound_msg; 939 error_msgs->push_back(compound_msg); 940 } 941 } else { 942 // TODO: What to lock here? 943 bool obsolete_file_cleanup_failed; 944 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 945 dex_location_checksum_pointer, 946 kRuntimeISA, error_msgs, 947 &obsolete_file_cleanup_failed)); 948 // There's no point in going forward and eventually try to regenerate the 949 // file if we couldn't remove the obsolete one. Mostly likely we will fail 950 // with the same error when trying to write the new file. 951 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 952 if (obsolete_file_cleanup_failed) { 953 return false; 954 } 955 } 956 needs_registering = true; 957 } 958 959 // 3) If we have an oat file, check all contained multidex files for our dex_location. 960 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 961 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 962 dex_location_checksum_pointer, 963 false, error_msgs, dex_files); 964 if (success) { 965 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 966 if (needs_registering) { 967 // We opened the oat file, so we must register it. 968 RegisterOatFile(oat_file); 969 } 970 // If the file isn't executable we failed patchoat but did manage to get the dex files. 971 return oat_file->IsExecutable(); 972 } else { 973 if (needs_registering) { 974 // We opened it, delete it. 975 open_oat_file.reset(); 976 } else { 977 open_oat_file.release(); // Do not delete open oat files. 978 } 979 } 980 981 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 982 983 // Need a checksum, fail else. 984 if (!have_checksum) { 985 error_msgs->push_back(checksum_error_msg); 986 return false; 987 } 988 989 // Look in cache location if no oat_location is given. 990 std::string cache_location; 991 if (oat_location == nullptr) { 992 // Use the dalvik cache. 993 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 994 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 995 oat_location = cache_location.c_str(); 996 } 997 998 bool has_flock = true; 999 // Definitely need to lock now. 1000 if (!scoped_flock.HasFile()) { 1001 std::string error_msg; 1002 if (!scoped_flock.Init(oat_location, &error_msg)) { 1003 error_msgs->push_back(error_msg); 1004 has_flock = false; 1005 } 1006 } 1007 1008 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1009 // Create the oat file. 1010 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1011 oat_location, error_msgs)); 1012 } 1013 1014 // Failed, bail. 1015 if (open_oat_file.get() == nullptr) { 1016 std::string error_msg; 1017 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1018 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1019 error_msgs->push_back(error_msg); 1020 return false; 1021 } 1022 1023 // Try to load again, but stronger checks. 1024 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1025 dex_location_checksum_pointer, 1026 true, error_msgs, dex_files); 1027 if (success) { 1028 RegisterOatFile(open_oat_file.release()); 1029 return true; 1030 } else { 1031 return false; 1032 } 1033} 1034 1035const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1036 uint32_t dex_location_checksum, 1037 const char* oat_location, 1038 std::string* error_msg) { 1039 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1040 !Runtime::Current()->IsCompiler(), 1041 error_msg)); 1042 if (oat_file.get() == nullptr) { 1043 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1044 error_msg->c_str()); 1045 return nullptr; 1046 } 1047 Runtime* runtime = Runtime::Current(); 1048 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1049 if (image_space != nullptr) { 1050 const ImageHeader& image_header = image_space->GetImageHeader(); 1051 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1052 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1053 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1054 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1055 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1056 actual_image_oat_checksum); 1057 return nullptr; 1058 } 1059 1060 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1061 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1062 if (expected_image_oat_offset != actual_image_oat_offset) { 1063 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1064 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1065 actual_image_oat_offset); 1066 return nullptr; 1067 } 1068 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1069 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1070 if (expected_patch_delta != actual_patch_delta) { 1071 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1072 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1073 return nullptr; 1074 } 1075 } 1076 1077 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1078 &dex_location_checksum); 1079 if (oat_dex_file == nullptr) { 1080 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1081 dex_location); 1082 return nullptr; 1083 } 1084 uint32_t expected_dex_checksum = dex_location_checksum; 1085 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1086 if (expected_dex_checksum != actual_dex_checksum) { 1087 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1088 "found 0x%x", oat_location, expected_dex_checksum, 1089 actual_dex_checksum); 1090 return nullptr; 1091 } 1092 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1093 if (dex_file.get() != nullptr) { 1094 return oat_file.release(); 1095 } else { 1096 return nullptr; 1097 } 1098} 1099 1100const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1101 int fd, const char* oat_location, 1102 std::vector<std::string>* error_msgs) { 1103 // Generate the output oat file for the dex file 1104 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1105 std::string error_msg; 1106 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1107 CHECK(!error_msg.empty()); 1108 error_msgs->push_back(error_msg); 1109 return nullptr; 1110 } 1111 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1112 !Runtime::Current()->IsCompiler(), 1113 &error_msg)); 1114 if (oat_file.get() == nullptr) { 1115 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1116 oat_location, error_msg.c_str()); 1117 error_msgs->push_back(compound_msg); 1118 return nullptr; 1119 } 1120 1121 return oat_file.release(); 1122} 1123 1124bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1125 const InstructionSet instruction_set) { 1126 Runtime* runtime = Runtime::Current(); 1127 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1128 if (image_space == nullptr) { 1129 return false; 1130 } 1131 uint32_t image_oat_checksum = 0; 1132 if (instruction_set == kRuntimeISA) { 1133 const ImageHeader& image_header = image_space->GetImageHeader(); 1134 image_oat_checksum = image_header.GetOatChecksum(); 1135 } else { 1136 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1137 image_space->GetImageLocation().c_str(), instruction_set)); 1138 image_oat_checksum = image_header->GetOatChecksum(); 1139 } 1140 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1141} 1142 1143bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1144 const InstructionSet instruction_set, 1145 std::string* error_msg) { 1146 Runtime* runtime = Runtime::Current(); 1147 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1148 if (image_space == nullptr) { 1149 *error_msg = "No image space for verification against"; 1150 return false; 1151 } 1152 1153 // If the requested instruction set is the same as the current runtime, 1154 // we can use the checksums directly. If it isn't, we'll have to read the 1155 // image header from the image for the right instruction set. 1156 uint32_t image_oat_checksum = 0; 1157 uintptr_t image_oat_data_begin = 0; 1158 int32_t image_patch_delta = 0; 1159 if (instruction_set == runtime->GetInstructionSet()) { 1160 const ImageHeader& image_header = image_space->GetImageHeader(); 1161 image_oat_checksum = image_header.GetOatChecksum(); 1162 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1163 image_patch_delta = image_header.GetPatchDelta(); 1164 } else { 1165 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1166 image_space->GetImageLocation().c_str(), instruction_set)); 1167 image_oat_checksum = image_header->GetOatChecksum(); 1168 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1169 image_patch_delta = image_header->GetPatchDelta(); 1170 } 1171 const OatHeader& oat_header = oat_file->GetOatHeader(); 1172 bool ret = (oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum); 1173 1174 // If the oat file is PIC, it doesn't care if/how image was relocated. Ignore these checks. 1175 if (!oat_file->IsPic()) { 1176 ret = ret && (oat_header.GetImagePatchDelta() == image_patch_delta) 1177 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin); 1178 } 1179 if (!ret) { 1180 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1181 oat_file->GetLocation().c_str(), 1182 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1183 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1184 oat_file->GetOatHeader().GetImagePatchDelta(), 1185 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1186 } 1187 return ret; 1188} 1189 1190bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1191 const char* dex_location, 1192 uint32_t dex_location_checksum, 1193 const InstructionSet instruction_set, 1194 std::string* error_msg) { 1195 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1196 return false; 1197 } 1198 1199 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1200 &dex_location_checksum); 1201 if (oat_dex_file == nullptr) { 1202 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1203 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1204 for (const OatFile::OatDexFile* oat_dex_file_in : oat_file->GetOatDexFiles()) { 1205 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1206 oat_file->GetLocation().c_str(), 1207 oat_dex_file_in->GetDexFileLocation().c_str(), 1208 oat_dex_file_in->GetDexFileLocationChecksum()); 1209 } 1210 return false; 1211 } 1212 1213 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1214 return true; 1215} 1216 1217bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1218 const char* dex_location, 1219 const uint32_t* dex_location_checksum, 1220 std::string* error_msg) { 1221 CHECK(oat_file != nullptr); 1222 CHECK(dex_location != nullptr); 1223 std::unique_ptr<const DexFile> dex_file; 1224 if (dex_location_checksum == nullptr) { 1225 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1226 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1227 // directory. 1228 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1229 if (oat_dex_file == nullptr) { 1230 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1231 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1232 error_msg->c_str()); 1233 return false; 1234 } 1235 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1236 } else { 1237 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1238 kRuntimeISA, error_msg); 1239 if (!verified) { 1240 return false; 1241 } 1242 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1243 dex_location_checksum)->OpenDexFile(error_msg)); 1244 } 1245 return dex_file.get() != nullptr; 1246} 1247 1248const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1249 const char* dex_location, 1250 const uint32_t* dex_location_checksum, 1251 InstructionSet isa, 1252 std::vector<std::string>* error_msgs, 1253 bool* obsolete_file_cleanup_failed) { 1254 *obsolete_file_cleanup_failed = false; 1255 bool already_opened = false; 1256 std::string dex_location_str(dex_location); 1257 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1258 &already_opened, 1259 obsolete_file_cleanup_failed, 1260 error_msgs)); 1261 std::string error_msg; 1262 if (oat_file.get() == nullptr) { 1263 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1264 dex_location)); 1265 return nullptr; 1266 } else if (oat_file->IsExecutable() && 1267 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1268 dex_location_checksum, &error_msg)) { 1269 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1270 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1271 error_msg.c_str())); 1272 return nullptr; 1273 } else if (!oat_file->IsExecutable() && 1274 Runtime::Current()->GetHeap()->HasImageSpace() && 1275 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1276 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1277 "dex location '%s'. Image checksum incorrect.", 1278 oat_file->GetLocation().c_str(), dex_location)); 1279 return nullptr; 1280 } else { 1281 return oat_file.release(); 1282 } 1283} 1284 1285const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1286 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1287 for (size_t i = 0; i < oat_files_.size(); i++) { 1288 const OatFile* oat_file = oat_files_[i]; 1289 DCHECK(oat_file != nullptr); 1290 if (oat_file->GetLocation() == oat_location) { 1291 return oat_file; 1292 } 1293 } 1294 return nullptr; 1295} 1296 1297const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1298 InstructionSet isa, 1299 bool *already_opened, 1300 bool *obsolete_file_cleanup_failed, 1301 std::vector<std::string>* error_msgs) { 1302 // Find out if we've already opened the file 1303 const OatFile* ret = nullptr; 1304 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1305 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1306 if (ret != nullptr) { 1307 *already_opened = true; 1308 return ret; 1309 } 1310 1311 std::string dalvik_cache; 1312 bool have_android_data = false; 1313 bool have_dalvik_cache = false; 1314 bool is_global_cache = false; 1315 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1316 &have_android_data, &have_dalvik_cache, &is_global_cache); 1317 std::string cache_filename; 1318 if (have_dalvik_cache) { 1319 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1320 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1321 if (ret != nullptr) { 1322 *already_opened = true; 1323 return ret; 1324 } 1325 } else { 1326 // If we need to relocate we should just place odex back where it started. 1327 cache_filename = odex_filename; 1328 } 1329 1330 ret = nullptr; 1331 1332 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1333 // 1334 // Now we do the following: 1335 // 1) Try and open the odex version 1336 // 2) If present, checksum-verified & relocated correctly return it 1337 // 3) Close the odex version to free up its address space. 1338 // 4) Try and open the cache version 1339 // 5) If present, checksum-verified & relocated correctly return it 1340 // 6) Close the cache version to free up its address space. 1341 // 7) If we should relocate: 1342 // a) If we have opened and checksum-verified the odex version relocate it to 1343 // 'cache_filename' and return it 1344 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1345 // it. This should not happen often (I think only the run-test's will hit this case). 1346 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1347 // this point. 1348 // 9) Return nullptr 1349 1350 *already_opened = false; 1351 const Runtime* runtime = Runtime::Current(); 1352 CHECK(runtime != nullptr); 1353 bool executable = !runtime->IsCompiler(); 1354 1355 std::string odex_error_msg; 1356 bool should_patch_system = false; 1357 bool odex_checksum_verified = false; 1358 bool have_system_odex = false; 1359 { 1360 // There is a high probability that both these oat files map similar/the same address 1361 // spaces so we must scope them like this so they each gets its turn. 1362 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1363 nullptr, 1364 executable, &odex_error_msg)); 1365 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1366 &odex_checksum_verified, 1367 &odex_error_msg)) { 1368 return odex_oat_file.release(); 1369 } else { 1370 if (odex_checksum_verified) { 1371 // We can just relocate 1372 should_patch_system = true; 1373 odex_error_msg = "Image Patches are incorrect"; 1374 } 1375 if (odex_oat_file.get() != nullptr) { 1376 have_system_odex = true; 1377 } 1378 } 1379 } 1380 1381 std::string cache_error_msg; 1382 bool should_patch_cache = false; 1383 bool cache_checksum_verified = false; 1384 if (have_dalvik_cache) { 1385 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1386 nullptr, 1387 executable, &cache_error_msg)); 1388 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1389 &cache_checksum_verified, 1390 &cache_error_msg)) { 1391 return cache_oat_file.release(); 1392 } else if (cache_checksum_verified) { 1393 // We can just relocate 1394 should_patch_cache = true; 1395 cache_error_msg = "Image Patches are incorrect"; 1396 } 1397 } else if (have_android_data) { 1398 // dalvik_cache does not exist but android data does. This means we should be able to create 1399 // it, so we should try. 1400 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1401 } 1402 1403 ret = nullptr; 1404 std::string error_msg; 1405 if (runtime->CanRelocate()) { 1406 // Run relocation 1407 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1408 if (space != nullptr) { 1409 const std::string& image_location = space->GetImageLocation(); 1410 if (odex_checksum_verified && should_patch_system) { 1411 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1412 } else if (cache_checksum_verified && should_patch_cache) { 1413 CHECK(have_dalvik_cache); 1414 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1415 } 1416 } else if (have_system_odex) { 1417 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1418 } 1419 } 1420 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1421 // implicitly: were able to fine where the cached version is but we were unable to use it, 1422 // either as a destination for relocation or to open a file. We should delete it if it is 1423 // there. 1424 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1425 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1426 "searching for dex file %s: %s", 1427 cache_filename.c_str(), dex_location.c_str(), 1428 strerror(errno)); 1429 error_msgs->push_back(rm_error_msg); 1430 VLOG(class_linker) << rm_error_msg; 1431 // Let the caller know that we couldn't remove the obsolete file. 1432 // This is a good indication that further writes may fail as well. 1433 *obsolete_file_cleanup_failed = true; 1434 } 1435 } 1436 if (ret == nullptr) { 1437 VLOG(class_linker) << error_msg; 1438 error_msgs->push_back(error_msg); 1439 std::string relocation_msg; 1440 if (runtime->CanRelocate()) { 1441 relocation_msg = StringPrintf(" and relocation failed"); 1442 } 1443 if (have_dalvik_cache && cache_checksum_verified) { 1444 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1445 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1446 cache_filename.c_str(), cache_error_msg.c_str(), 1447 relocation_msg.c_str()); 1448 } else { 1449 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1450 "dalvik_cache availible)%s.", odex_filename.c_str(), 1451 odex_error_msg.c_str(), relocation_msg.c_str()); 1452 } 1453 VLOG(class_linker) << error_msg; 1454 error_msgs->push_back(error_msg); 1455 } 1456 return ret; 1457} 1458 1459const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1460 InstructionSet isa, 1461 std::string* error_msg) { 1462 // We open it non-executable 1463 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, nullptr, false, error_msg)); 1464 if (output.get() == nullptr) { 1465 return nullptr; 1466 } 1467 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1468 VerifyOatImageChecksum(output.get(), isa)) { 1469 return output.release(); 1470 } else { 1471 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1472 oat_path.c_str()); 1473 return nullptr; 1474 } 1475} 1476 1477const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1478 const std::string& output_oat, 1479 const std::string& image_location, 1480 InstructionSet isa, 1481 std::string* error_msg) { 1482 Runtime* runtime = Runtime::Current(); 1483 DCHECK(runtime != nullptr); 1484 if (!runtime->GetHeap()->HasImageSpace()) { 1485 // We don't have an image space so there is no point in trying to patchoat. 1486 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1487 << "running without an image. Attempting to use oat file for interpretation."; 1488 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1489 } 1490 if (!runtime->IsDex2OatEnabled()) { 1491 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1492 // input_oat but make sure we only do interpretation on it's dex files. 1493 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1494 << "disabled. Attempting to use oat file for interpretation"; 1495 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1496 } 1497 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1498 std::string patchoat(runtime->GetPatchoatExecutable()); 1499 1500 std::string isa_arg("--instruction-set="); 1501 isa_arg += GetInstructionSetString(isa); 1502 std::string input_oat_filename_arg("--input-oat-file="); 1503 input_oat_filename_arg += input_oat; 1504 std::string output_oat_filename_arg("--output-oat-file="); 1505 output_oat_filename_arg += output_oat; 1506 std::string patched_image_arg("--patched-image-location="); 1507 patched_image_arg += image_location; 1508 1509 std::vector<std::string> argv; 1510 argv.push_back(patchoat); 1511 argv.push_back(isa_arg); 1512 argv.push_back(input_oat_filename_arg); 1513 argv.push_back(output_oat_filename_arg); 1514 argv.push_back(patched_image_arg); 1515 1516 std::string command_line(Join(argv, ' ')); 1517 LOG(INFO) << "Relocate Oat File: " << command_line; 1518 bool success = Exec(argv, error_msg); 1519 if (success) { 1520 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr, 1521 !runtime->IsCompiler(), error_msg)); 1522 bool checksum_verified = false; 1523 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1524 error_msg)) { 1525 return output.release(); 1526 } else if (output.get() != nullptr) { 1527 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1528 "but output file '%s' failed verifcation: %s", 1529 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1530 } else { 1531 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1532 "but was unable to open output file '%s': %s", 1533 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1534 } 1535 } else if (!runtime->IsCompiler()) { 1536 // patchoat failed which means we probably don't have enough room to place the output oat file, 1537 // instead of failing we should just run the interpreter from the dex files in the input oat. 1538 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1539 << "for interpretation. patchoat failure was: " << *error_msg; 1540 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1541 } else { 1542 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1543 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1544 error_msg->c_str()); 1545 } 1546 return nullptr; 1547} 1548 1549bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1550 bool* checksum_verified, 1551 std::string* error_msg) { 1552 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1553 if (image_space == nullptr) { 1554 *error_msg = "No image space present"; 1555 return false; 1556 } 1557 uint32_t real_image_checksum; 1558 void* real_image_oat_offset; 1559 int32_t real_patch_delta; 1560 if (isa == runtime->GetInstructionSet()) { 1561 const ImageHeader& image_header = image_space->GetImageHeader(); 1562 real_image_checksum = image_header.GetOatChecksum(); 1563 real_image_oat_offset = image_header.GetOatDataBegin(); 1564 real_patch_delta = image_header.GetPatchDelta(); 1565 } else { 1566 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1567 image_space->GetImageLocation().c_str(), isa)); 1568 real_image_checksum = image_header->GetOatChecksum(); 1569 real_image_oat_offset = image_header->GetOatDataBegin(); 1570 real_patch_delta = image_header->GetPatchDelta(); 1571 } 1572 1573 const OatHeader& oat_header = oat_file->GetOatHeader(); 1574 std::string compound_msg; 1575 1576 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1577 *checksum_verified = oat_image_checksum == real_image_checksum; 1578 if (!*checksum_verified) { 1579 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1580 real_image_checksum, oat_image_checksum); 1581 } 1582 1583 bool offset_verified; 1584 bool patch_delta_verified; 1585 1586 if (!oat_file->IsPic()) { 1587 // If an oat file is not PIC, we need to check that the image is at the expected location and 1588 // patched in the same way. 1589 void* oat_image_oat_offset = 1590 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1591 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1592 if (!offset_verified) { 1593 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1594 real_image_oat_offset, oat_image_oat_offset); 1595 } 1596 1597 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1598 patch_delta_verified = oat_patch_delta == real_patch_delta; 1599 if (!patch_delta_verified) { 1600 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, " 1601 "received 0x%x)", real_patch_delta, oat_patch_delta); 1602 } 1603 } else { 1604 // If an oat file is PIC, we ignore offset and patching delta. 1605 offset_verified = true; 1606 patch_delta_verified = true; 1607 } 1608 1609 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1610 if (!ret) { 1611 *error_msg = "Oat file failed to verify:" + compound_msg; 1612 } 1613 return ret; 1614} 1615 1616const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1617 std::string* error_msg) { 1618 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1619 if (oat_file != nullptr) { 1620 return oat_file; 1621 } 1622 1623 return OatFile::Open(oat_location, oat_location, nullptr, nullptr, !Runtime::Current()->IsCompiler(), 1624 error_msg); 1625} 1626 1627void ClassLinker::InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) { 1628 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1629 DCHECK(obj != nullptr); 1630 DCHECK(class_linker != nullptr); 1631 size_t pointer_size = class_linker->image_pointer_size_; 1632 1633 if (obj->IsArtMethod()) { 1634 mirror::ArtMethod* method = obj->AsArtMethod(); 1635 if (!method->IsNative()) { 1636 method->SetEntryPointFromInterpreterPtrSize(artInterpreterToInterpreterBridge, pointer_size); 1637 if (method != Runtime::Current()->GetResolutionMethod()) { 1638 method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(), 1639 pointer_size); 1640 } 1641 } 1642 } 1643} 1644 1645void ClassLinker::InitFromImage() { 1646 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1647 CHECK(!init_done_); 1648 1649 Thread* self = Thread::Current(); 1650 gc::Heap* heap = Runtime::Current()->GetHeap(); 1651 gc::space::ImageSpace* space = heap->GetImageSpace(); 1652 dex_cache_image_class_lookup_required_ = true; 1653 CHECK(space != nullptr); 1654 OatFile& oat_file = GetImageOatFile(space); 1655 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1656 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1657 const char* image_file_location = oat_file.GetOatHeader(). 1658 GetStoreValueByKey(OatHeader::kImageLocationKey); 1659 CHECK(image_file_location == nullptr || *image_file_location == 0); 1660 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1661 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1662 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1663 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1664 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1665 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1666 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1667 1668 StackHandleScope<1> hs(self); 1669 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1670 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1671 AsObjectArray<mirror::Class>())); 1672 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1673 1674 // Special case of setting up the String class early so that we can test arbitrary objects 1675 // as being Strings or not 1676 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1677 1678 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1679 static_cast<uint32_t>(dex_caches->GetLength())); 1680 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1681 StackHandleScope<1> hs2(self); 1682 Handle<mirror::DexCache> dex_cache(hs2.NewHandle(dex_caches->Get(i))); 1683 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1684 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1685 nullptr); 1686 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1687 std::string error_msg; 1688 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1689 if (dex_file == nullptr) { 1690 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1691 << " from within oat file " << oat_file.GetLocation() 1692 << " error '" << error_msg << "'"; 1693 UNREACHABLE(); 1694 } 1695 1696 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1697 1698 AppendToBootClassPath(*dex_file, dex_cache); 1699 } 1700 1701 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1702 // bitmap walk. 1703 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1704 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 1705 if (!Runtime::Current()->IsCompiler()) { 1706 // Compiler supports having an image with a different pointer size than the runtime. This 1707 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 1708 // also use 32 bit dex2oat on a system with 64 bit apps. 1709 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 1710 << sizeof(void*); 1711 } 1712 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 1713 image_pointer_size_ = 4; 1714 } else { 1715 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 1716 image_pointer_size_ = 8; 1717 } 1718 1719 // Set entry point to interpreter if in InterpretOnly mode. 1720 Runtime* runtime = Runtime::Current(); 1721 if (!runtime->IsCompiler() && runtime->GetInstrumentation()->InterpretOnly()) { 1722 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1723 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1724 } 1725 1726 // reinit class_roots_ 1727 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1728 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1729 1730 // reinit array_iftable_ from any array class instance, they should be == 1731 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1732 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1733 // String class root was set above 1734 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1735 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1736 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1737 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1738 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1739 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1740 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1741 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1742 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1743 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1744 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1745 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1746 1747 FinishInit(self); 1748 1749 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1750} 1751 1752void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1753 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1754 if ((flags & kVisitRootFlagAllRoots) != 0) { 1755 for (GcRoot<mirror::Class>& root : class_table_) { 1756 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1757 } 1758 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1759 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1760 } 1761 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1762 for (auto& root : new_class_roots_) { 1763 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 1764 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1765 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 1766 if (UNLIKELY(new_ref != old_ref)) { 1767 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1768 // corresponding object. This is slow, but luckily for us, this may only happen with a 1769 // concurrent moving GC. 1770 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 1771 class_table_.Erase(it); 1772 class_table_.Insert(GcRoot<mirror::Class>(new_ref)); 1773 } 1774 } 1775 } 1776 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1777 new_class_roots_.clear(); 1778 } 1779 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1780 log_new_class_table_roots_ = true; 1781 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1782 log_new_class_table_roots_ = false; 1783 } 1784 // We deliberately ignore the class roots in the image since we 1785 // handle image roots by using the MS/CMS rescanning of dirty cards. 1786} 1787 1788// Keep in sync with InitCallback. Anything we visit, we need to 1789// reinit references to when reinitializing a ClassLinker from a 1790// mapped image. 1791void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1792 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1793 Thread* self = Thread::Current(); 1794 { 1795 ReaderMutexLock mu(self, dex_lock_); 1796 if ((flags & kVisitRootFlagAllRoots) != 0) { 1797 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1798 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1799 } 1800 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1801 for (size_t index : new_dex_cache_roots_) { 1802 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1803 } 1804 } 1805 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1806 new_dex_cache_roots_.clear(); 1807 } 1808 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1809 log_new_dex_caches_roots_ = true; 1810 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1811 log_new_dex_caches_roots_ = false; 1812 } 1813 } 1814 VisitClassRoots(callback, arg, flags); 1815 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1816 DCHECK(!array_iftable_.IsNull()); 1817 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1818 if (!find_array_class_cache_[i].IsNull()) { 1819 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1820 } 1821 } 1822} 1823 1824void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1825 if (dex_cache_image_class_lookup_required_) { 1826 MoveImageClassesToClassTable(); 1827 } 1828 // TODO: why isn't this a ReaderMutexLock? 1829 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1830 for (GcRoot<mirror::Class>& root : class_table_) { 1831 if (!visitor(root.Read(), arg)) { 1832 return; 1833 } 1834 } 1835 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1836 if (!visitor(root.Read(), arg)) { 1837 return; 1838 } 1839 } 1840} 1841 1842static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1843 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1844 classes->insert(c); 1845 return true; 1846} 1847 1848struct GetClassesVisitorArrayArg { 1849 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1850 int32_t index; 1851 bool success; 1852}; 1853 1854static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1855 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1856 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1857 if (arg->index < (*arg->classes)->GetLength()) { 1858 (*arg->classes)->Set(arg->index, c); 1859 arg->index++; 1860 return true; 1861 } else { 1862 arg->success = false; 1863 return false; 1864 } 1865} 1866 1867void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1868 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1869 // is avoiding duplicates. 1870 if (!kMovingClasses) { 1871 std::set<mirror::Class*> classes; 1872 VisitClasses(GetClassesVisitorSet, &classes); 1873 for (mirror::Class* klass : classes) { 1874 if (!visitor(klass, arg)) { 1875 return; 1876 } 1877 } 1878 } else { 1879 Thread* self = Thread::Current(); 1880 StackHandleScope<1> hs(self); 1881 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1882 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1883 GetClassesVisitorArrayArg local_arg; 1884 local_arg.classes = &classes; 1885 local_arg.success = false; 1886 // We size the array assuming classes won't be added to the class table during the visit. 1887 // If this assumption fails we iterate again. 1888 while (!local_arg.success) { 1889 size_t class_table_size; 1890 { 1891 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1892 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1893 } 1894 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1895 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1896 classes.Assign( 1897 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1898 CHECK(classes.Get() != nullptr); // OOME. 1899 local_arg.index = 0; 1900 local_arg.success = true; 1901 VisitClasses(GetClassesVisitorArray, &local_arg); 1902 } 1903 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1904 // If the class table shrank during creation of the clases array we expect null elements. If 1905 // the class table grew then the loop repeats. If classes are created after the loop has 1906 // finished then we don't visit. 1907 mirror::Class* klass = classes->Get(i); 1908 if (klass != nullptr && !visitor(klass, arg)) { 1909 return; 1910 } 1911 } 1912 } 1913} 1914 1915ClassLinker::~ClassLinker() { 1916 mirror::Class::ResetClass(); 1917 mirror::String::ResetClass(); 1918 mirror::Reference::ResetClass(); 1919 mirror::ArtField::ResetClass(); 1920 mirror::ArtMethod::ResetClass(); 1921 mirror::BooleanArray::ResetArrayClass(); 1922 mirror::ByteArray::ResetArrayClass(); 1923 mirror::CharArray::ResetArrayClass(); 1924 mirror::DoubleArray::ResetArrayClass(); 1925 mirror::FloatArray::ResetArrayClass(); 1926 mirror::IntArray::ResetArrayClass(); 1927 mirror::LongArray::ResetArrayClass(); 1928 mirror::ShortArray::ResetArrayClass(); 1929 mirror::Throwable::ResetClass(); 1930 mirror::StackTraceElement::ResetClass(); 1931 STLDeleteElements(&boot_class_path_); 1932 STLDeleteElements(&oat_files_); 1933} 1934 1935mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1936 gc::Heap* heap = Runtime::Current()->GetHeap(); 1937 StackHandleScope<16> hs(self); 1938 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1939 Handle<mirror::DexCache> dex_cache( 1940 hs.NewHandle(down_cast<mirror::DexCache*>( 1941 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1942 VoidFunctor())))); 1943 if (dex_cache.Get() == nullptr) { 1944 return nullptr; 1945 } 1946 Handle<mirror::String> 1947 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1948 if (location.Get() == nullptr) { 1949 return nullptr; 1950 } 1951 Handle<mirror::ObjectArray<mirror::String>> 1952 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1953 if (strings.Get() == nullptr) { 1954 return nullptr; 1955 } 1956 Handle<mirror::ObjectArray<mirror::Class>> 1957 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1958 if (types.Get() == nullptr) { 1959 return nullptr; 1960 } 1961 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1962 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1963 if (methods.Get() == nullptr) { 1964 return nullptr; 1965 } 1966 Handle<mirror::ObjectArray<mirror::ArtField>> 1967 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1968 if (fields.Get() == nullptr) { 1969 return nullptr; 1970 } 1971 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1972 fields.Get()); 1973 return dex_cache.Get(); 1974} 1975 1976mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1977 uint32_t class_size) { 1978 DCHECK_GE(class_size, sizeof(mirror::Class)); 1979 gc::Heap* heap = Runtime::Current()->GetHeap(); 1980 mirror::Class::InitializeClassVisitor visitor(class_size); 1981 mirror::Object* k = kMovingClasses ? 1982 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1983 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1984 if (UNLIKELY(k == nullptr)) { 1985 CHECK(self->IsExceptionPending()); // OOME. 1986 return nullptr; 1987 } 1988 return k->AsClass(); 1989} 1990 1991mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1992 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1993} 1994 1995mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1996 return down_cast<mirror::ArtField*>( 1997 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1998} 1999 2000mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 2001 return down_cast<mirror::ArtMethod*>( 2002 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 2003} 2004 2005mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 2006 Thread* self, size_t length) { 2007 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 2008 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 2009} 2010 2011mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2012 mirror::Class* klass) { 2013 DCHECK(klass != nullptr); 2014 2015 // For temporary classes we must wait for them to be retired. 2016 if (init_done_ && klass->IsTemp()) { 2017 CHECK(!klass->IsResolved()); 2018 if (klass->IsErroneous()) { 2019 ThrowEarlierClassFailure(klass); 2020 return nullptr; 2021 } 2022 StackHandleScope<1> hs(self); 2023 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2024 ObjectLock<mirror::Class> lock(self, h_class); 2025 // Loop and wait for the resolving thread to retire this class. 2026 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2027 lock.WaitIgnoringInterrupts(); 2028 } 2029 if (h_class->IsErroneous()) { 2030 ThrowEarlierClassFailure(h_class.Get()); 2031 return nullptr; 2032 } 2033 CHECK(h_class->IsRetired()); 2034 // Get the updated class from class table. 2035 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor), 2036 h_class.Get()->GetClassLoader()); 2037 } 2038 2039 // Wait for the class if it has not already been linked. 2040 if (!klass->IsResolved() && !klass->IsErroneous()) { 2041 StackHandleScope<1> hs(self); 2042 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2043 ObjectLock<mirror::Class> lock(self, h_class); 2044 // Check for circular dependencies between classes. 2045 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2046 ThrowClassCircularityError(h_class.Get()); 2047 h_class->SetStatus(mirror::Class::kStatusError, self); 2048 return nullptr; 2049 } 2050 // Wait for the pending initialization to complete. 2051 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2052 lock.WaitIgnoringInterrupts(); 2053 } 2054 } 2055 2056 if (klass->IsErroneous()) { 2057 ThrowEarlierClassFailure(klass); 2058 return nullptr; 2059 } 2060 // Return the loaded class. No exceptions should be pending. 2061 CHECK(klass->IsResolved()) << PrettyClass(klass); 2062 self->AssertNoPendingException(); 2063 return klass; 2064} 2065 2066typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2067 2068// Search a collection of DexFiles for a descriptor 2069ClassPathEntry FindInClassPath(const char* descriptor, 2070 size_t hash, const std::vector<const DexFile*>& class_path) { 2071 for (const DexFile* dex_file : class_path) { 2072 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2073 if (dex_class_def != nullptr) { 2074 return ClassPathEntry(dex_file, dex_class_def); 2075 } 2076 } 2077 return ClassPathEntry(nullptr, nullptr); 2078} 2079 2080mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2081 Thread* self, const char* descriptor, 2082 size_t hash, 2083 Handle<mirror::ClassLoader> class_loader) { 2084 // Can we special case for a well understood PathClassLoader with the BootClassLoader as parent? 2085 if (class_loader->GetClass() != 2086 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2087 class_loader->GetParent()->GetClass() != 2088 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2089 return nullptr; 2090 } 2091 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2092 // Check if this would be found in the parent boot class loader. 2093 if (pair.second != nullptr) { 2094 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr); 2095 if (klass != nullptr) { 2096 // May return null if resolution on another thread fails. 2097 klass = EnsureResolved(self, descriptor, klass); 2098 } else { 2099 // May OOME. 2100 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2101 *pair.second); 2102 } 2103 if (klass == nullptr) { 2104 CHECK(self->IsExceptionPending()) << descriptor; 2105 self->ClearException(); 2106 } 2107 return klass; 2108 } else { 2109 // Handle as if this is the child PathClassLoader. 2110 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension). 2111 StackHandleScope<3> hs(self); 2112 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2113 // We need to get the DexPathList and loop through it. 2114 Handle<mirror::ArtField> cookie_field = 2115 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2116 Handle<mirror::ArtField> dex_file_field = 2117 hs.NewHandle( 2118 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2119 mirror::Object* dex_path_list = 2120 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2121 GetObject(class_loader.Get()); 2122 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2123 cookie_field.Get() != nullptr) { 2124 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2125 mirror::Object* dex_elements_obj = 2126 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2127 GetObject(dex_path_list); 2128 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2129 // at the mCookie which is a DexFile vector. 2130 if (dex_elements_obj != nullptr) { 2131 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2132 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2133 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2134 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2135 if (element == nullptr) { 2136 // Should never happen, fall back to java code to throw a NPE. 2137 break; 2138 } 2139 mirror::Object* dex_file = dex_file_field->GetObject(element); 2140 if (dex_file != nullptr) { 2141 const uint64_t cookie = cookie_field->GetLong(dex_file); 2142 auto* dex_files = 2143 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2144 if (dex_files == nullptr) { 2145 // This should never happen so log a warning. 2146 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2147 break; 2148 } 2149 for (const DexFile* cp_dex_file : *dex_files) { 2150 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash); 2151 if (dex_class_def != nullptr) { 2152 RegisterDexFile(*cp_dex_file); 2153 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, 2154 *cp_dex_file, *dex_class_def); 2155 if (klass == nullptr) { 2156 CHECK(self->IsExceptionPending()) << descriptor; 2157 self->ClearException(); 2158 return nullptr; 2159 } 2160 return klass; 2161 } 2162 } 2163 } 2164 } 2165 } 2166 } 2167 self->AssertNoPendingException(); 2168 return nullptr; 2169 } 2170} 2171 2172mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2173 Handle<mirror::ClassLoader> class_loader) { 2174 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2175 DCHECK(self != nullptr); 2176 self->AssertNoPendingException(); 2177 if (descriptor[1] == '\0') { 2178 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2179 // for primitive classes that aren't backed by dex files. 2180 return FindPrimitiveClass(descriptor[0]); 2181 } 2182 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 2183 // Find the class in the loaded classes table. 2184 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get()); 2185 if (klass != nullptr) { 2186 return EnsureResolved(self, descriptor, klass); 2187 } 2188 // Class is not yet loaded. 2189 if (descriptor[0] == '[') { 2190 return CreateArrayClass(self, descriptor, hash, class_loader); 2191 } else if (class_loader.Get() == nullptr) { 2192 // The boot class loader, search the boot class path. 2193 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2194 if (pair.second != nullptr) { 2195 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2196 *pair.second); 2197 } else { 2198 // The boot class loader is searched ahead of the application class loader, failures are 2199 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2200 // trigger the chaining with a proper stack trace. 2201 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2202 self->SetException(ThrowLocation(), pre_allocated); 2203 return nullptr; 2204 } 2205 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2206 // First try with the bootstrap class loader. 2207 if (class_loader.Get() != nullptr) { 2208 klass = LookupClass(self, descriptor, hash, nullptr); 2209 if (klass != nullptr) { 2210 return EnsureResolved(self, descriptor, klass); 2211 } 2212 } 2213 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2214 // a NoClassDefFoundError being allocated. 2215 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2216 if (pair.second != nullptr) { 2217 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2218 *pair.second); 2219 } 2220 // Next try the compile time class path. 2221 const std::vector<const DexFile*>* class_path; 2222 { 2223 ScopedObjectAccessUnchecked soa(self); 2224 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2225 soa.AddLocalReference<jobject>(class_loader.Get())); 2226 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2227 } 2228 pair = FindInClassPath(descriptor, hash, *class_path); 2229 if (pair.second != nullptr) { 2230 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 2231 } else { 2232 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2233 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2234 self->SetException(ThrowLocation(), pre_allocated); 2235 return nullptr; 2236 } 2237 } else { 2238 ScopedObjectAccessUnchecked soa(self); 2239 mirror::Class* cp_klass = FindClassInPathClassLoader(soa, self, descriptor, hash, 2240 class_loader); 2241 if (cp_klass != nullptr) { 2242 return cp_klass; 2243 } 2244 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2245 soa.AddLocalReference<jobject>(class_loader.Get())); 2246 std::string class_name_string(DescriptorToDot(descriptor)); 2247 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2248 { 2249 ScopedThreadStateChange tsc(self, kNative); 2250 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2251 soa.Env()->NewStringUTF(class_name_string.c_str())); 2252 if (class_name_object.get() == nullptr) { 2253 DCHECK(self->IsExceptionPending()); // OOME. 2254 return nullptr; 2255 } 2256 CHECK(class_loader_object.get() != nullptr); 2257 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2258 WellKnownClasses::java_lang_ClassLoader_loadClass, 2259 class_name_object.get())); 2260 } 2261 if (self->IsExceptionPending()) { 2262 // If the ClassLoader threw, pass that exception up. 2263 return nullptr; 2264 } else if (result.get() == nullptr) { 2265 // broken loader - throw NPE to be compatible with Dalvik 2266 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2267 class_name_string.c_str()).c_str()); 2268 return nullptr; 2269 } else { 2270 // success, return mirror::Class* 2271 return soa.Decode<mirror::Class*>(result.get()); 2272 } 2273 } 2274 UNREACHABLE(); 2275} 2276 2277mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 2278 Handle<mirror::ClassLoader> class_loader, 2279 const DexFile& dex_file, 2280 const DexFile::ClassDef& dex_class_def) { 2281 StackHandleScope<3> hs(self); 2282 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2283 2284 // Load the class from the dex file. 2285 if (UNLIKELY(!init_done_)) { 2286 // finish up init of hand crafted class_roots_ 2287 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2288 klass.Assign(GetClassRoot(kJavaLangObject)); 2289 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2290 klass.Assign(GetClassRoot(kJavaLangClass)); 2291 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2292 klass.Assign(GetClassRoot(kJavaLangString)); 2293 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2294 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2295 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2296 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2297 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2298 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2299 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2300 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2301 } 2302 } 2303 2304 if (klass.Get() == nullptr) { 2305 // Allocate a class with the status of not ready. 2306 // Interface object should get the right size here. Regular class will 2307 // figure out the right size later and be replaced with one of the right 2308 // size when the class becomes resolved. 2309 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2310 } 2311 if (UNLIKELY(klass.Get() == nullptr)) { 2312 CHECK(self->IsExceptionPending()); // Expect an OOME. 2313 return nullptr; 2314 } 2315 klass->SetDexCache(FindDexCache(dex_file)); 2316 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2317 ObjectLock<mirror::Class> lock(self, klass); 2318 if (self->IsExceptionPending()) { 2319 // An exception occured during load, set status to erroneous while holding klass' lock in case 2320 // notification is necessary. 2321 if (!klass->IsErroneous()) { 2322 klass->SetStatus(mirror::Class::kStatusError, self); 2323 } 2324 return nullptr; 2325 } 2326 klass->SetClinitThreadId(self->GetTid()); 2327 2328 // Add the newly loaded class to the loaded classes table. 2329 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 2330 if (existing != nullptr) { 2331 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2332 // this thread to block. 2333 return EnsureResolved(self, descriptor, existing); 2334 } 2335 2336 // Finish loading (if necessary) by finding parents 2337 CHECK(!klass->IsLoaded()); 2338 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2339 // Loading failed. 2340 if (!klass->IsErroneous()) { 2341 klass->SetStatus(mirror::Class::kStatusError, self); 2342 } 2343 return nullptr; 2344 } 2345 CHECK(klass->IsLoaded()); 2346 // Link the class (if necessary) 2347 CHECK(!klass->IsResolved()); 2348 // TODO: Use fast jobjects? 2349 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2350 2351 mirror::Class* new_class = nullptr; 2352 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2353 // Linking failed. 2354 if (!klass->IsErroneous()) { 2355 klass->SetStatus(mirror::Class::kStatusError, self); 2356 } 2357 return nullptr; 2358 } 2359 self->AssertNoPendingException(); 2360 CHECK(new_class != nullptr) << descriptor; 2361 CHECK(new_class->IsResolved()) << descriptor; 2362 2363 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2364 2365 /* 2366 * We send CLASS_PREPARE events to the debugger from here. The 2367 * definition of "preparation" is creating the static fields for a 2368 * class and initializing them to the standard default values, but not 2369 * executing any code (that comes later, during "initialization"). 2370 * 2371 * We did the static preparation in LinkClass. 2372 * 2373 * The class has been prepared and resolved but possibly not yet verified 2374 * at this point. 2375 */ 2376 Dbg::PostClassPrepare(new_class_h.Get()); 2377 2378 return new_class_h.Get(); 2379} 2380 2381uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2382 const DexFile::ClassDef& dex_class_def) { 2383 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2384 size_t num_ref = 0; 2385 size_t num_8 = 0; 2386 size_t num_16 = 0; 2387 size_t num_32 = 0; 2388 size_t num_64 = 0; 2389 if (class_data != nullptr) { 2390 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2391 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2392 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2393 char c = descriptor[0]; 2394 switch (c) { 2395 case 'L': 2396 case '[': 2397 num_ref++; 2398 break; 2399 case 'J': 2400 case 'D': 2401 num_64++; 2402 break; 2403 case 'I': 2404 case 'F': 2405 num_32++; 2406 break; 2407 case 'S': 2408 case 'C': 2409 num_16++; 2410 break; 2411 case 'B': 2412 case 'Z': 2413 num_8++; 2414 break; 2415 default: 2416 LOG(FATAL) << "Unknown descriptor: " << c; 2417 UNREACHABLE(); 2418 } 2419 } 2420 } 2421 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2422} 2423 2424OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2425 bool* found) { 2426 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2427 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2428 if (oat_dex_file == nullptr) { 2429 *found = false; 2430 return OatFile::OatClass::Invalid(); 2431 } 2432 *found = true; 2433 return oat_dex_file->GetOatClass(class_def_idx); 2434} 2435 2436static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2437 uint32_t method_idx) { 2438 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2439 const uint8_t* class_data = dex_file.GetClassData(class_def); 2440 CHECK(class_data != nullptr); 2441 ClassDataItemIterator it(dex_file, class_data); 2442 // Skip fields 2443 while (it.HasNextStaticField()) { 2444 it.Next(); 2445 } 2446 while (it.HasNextInstanceField()) { 2447 it.Next(); 2448 } 2449 // Process methods 2450 size_t class_def_method_index = 0; 2451 while (it.HasNextDirectMethod()) { 2452 if (it.GetMemberIndex() == method_idx) { 2453 return class_def_method_index; 2454 } 2455 class_def_method_index++; 2456 it.Next(); 2457 } 2458 while (it.HasNextVirtualMethod()) { 2459 if (it.GetMemberIndex() == method_idx) { 2460 return class_def_method_index; 2461 } 2462 class_def_method_index++; 2463 it.Next(); 2464 } 2465 DCHECK(!it.HasNext()); 2466 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2467 UNREACHABLE(); 2468} 2469 2470const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2471 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2472 // method for direct methods (or virtual methods made direct). 2473 mirror::Class* declaring_class = method->GetDeclaringClass(); 2474 size_t oat_method_index; 2475 if (method->IsStatic() || method->IsDirect()) { 2476 // Simple case where the oat method index was stashed at load time. 2477 oat_method_index = method->GetMethodIndex(); 2478 } else { 2479 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2480 // by search for its position in the declared virtual methods. 2481 oat_method_index = declaring_class->NumDirectMethods(); 2482 size_t end = declaring_class->NumVirtualMethods(); 2483 bool found_virtual = false; 2484 for (size_t i = 0; i < end; i++) { 2485 // Check method index instead of identity in case of duplicate method definitions. 2486 if (method->GetDexMethodIndex() == 2487 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2488 found_virtual = true; 2489 break; 2490 } 2491 oat_method_index++; 2492 } 2493 CHECK(found_virtual) << "Didn't find oat method index for virtual method: " 2494 << PrettyMethod(method); 2495 } 2496 DCHECK_EQ(oat_method_index, 2497 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2498 method->GetDeclaringClass()->GetDexClassDefIndex(), 2499 method->GetDexMethodIndex())); 2500 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2501 declaring_class->GetDexClassDefIndex(), 2502 found); 2503 if (!(*found)) { 2504 return OatFile::OatMethod::Invalid(); 2505 } 2506 return oat_class.GetOatMethod(oat_method_index); 2507} 2508 2509// Special case to get oat code without overwriting a trampoline. 2510const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2511 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2512 if (method->IsProxyMethod()) { 2513 return GetQuickProxyInvokeHandler(); 2514 } 2515 bool found; 2516 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2517 const void* result = nullptr; 2518 if (found) { 2519 result = oat_method.GetQuickCode(); 2520 } 2521 2522 if (result == nullptr) { 2523 if (method->IsNative()) { 2524 // No code and native? Use generic trampoline. 2525 result = GetQuickGenericJniStub(); 2526 } else { 2527 // No code? You must mean to go into the interpreter. 2528 result = GetQuickToInterpreterBridge(); 2529 } 2530 } 2531 return result; 2532} 2533 2534const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2535 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2536 return nullptr; 2537 } 2538 bool found; 2539 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2540 return found ? oat_method.GetQuickCode() : nullptr; 2541} 2542 2543const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2544 uint32_t method_idx) { 2545 bool found; 2546 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2547 if (!found) { 2548 return nullptr; 2549 } 2550 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2551 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2552} 2553 2554// Returns true if the method must run with interpreter, false otherwise. 2555static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code) 2556 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2557 if (quick_code == nullptr) { 2558 // No code: need interpreter. 2559 // May return true for native code, in the case of generic JNI 2560 // DCHECK(!method->IsNative()); 2561 return true; 2562 } 2563 // If interpreter mode is enabled, every method (except native and proxy) must 2564 // be run with interpreter. 2565 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2566 !method->IsNative() && !method->IsProxyMethod(); 2567} 2568 2569void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2570 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2571 if (klass->NumDirectMethods() == 0) { 2572 return; // No direct methods => no static methods. 2573 } 2574 Runtime* runtime = Runtime::Current(); 2575 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2576 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2577 return; // OAT file unavailable. 2578 } 2579 } 2580 2581 const DexFile& dex_file = klass->GetDexFile(); 2582 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2583 CHECK(dex_class_def != nullptr); 2584 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2585 // There should always be class data if there were direct methods. 2586 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2587 ClassDataItemIterator it(dex_file, class_data); 2588 // Skip fields 2589 while (it.HasNextStaticField()) { 2590 it.Next(); 2591 } 2592 while (it.HasNextInstanceField()) { 2593 it.Next(); 2594 } 2595 bool has_oat_class; 2596 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2597 &has_oat_class); 2598 // Link the code of methods skipped by LinkCode. 2599 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2600 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2601 if (!method->IsStatic()) { 2602 // Only update static methods. 2603 continue; 2604 } 2605 const void* quick_code = nullptr; 2606 if (has_oat_class) { 2607 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2608 quick_code = oat_method.GetQuickCode(); 2609 } 2610 const bool enter_interpreter = NeedsInterpreter(method, quick_code); 2611 if (enter_interpreter) { 2612 // Use interpreter entry point. 2613 // Check whether the method is native, in which case it's generic JNI. 2614 if (quick_code == nullptr && method->IsNative()) { 2615 quick_code = GetQuickGenericJniStub(); 2616 } else { 2617 quick_code = GetQuickToInterpreterBridge(); 2618 } 2619 } 2620 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code); 2621 } 2622 // Ignore virtual methods on the iterator. 2623} 2624 2625void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2626 const OatFile::OatClass* oat_class, 2627 uint32_t class_def_method_index) { 2628 Runtime* runtime = Runtime::Current(); 2629 if (runtime->IsCompiler()) { 2630 // The following code only applies to a non-compiler runtime. 2631 return; 2632 } 2633 // Method shouldn't have already been linked. 2634 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2635 if (oat_class != nullptr) { 2636 // Every kind of method should at least get an invoke stub from the oat_method. 2637 // non-abstract methods also get their code pointers. 2638 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index); 2639 oat_method.LinkMethod(method.Get()); 2640 } 2641 2642 // Install entry point from interpreter. 2643 bool enter_interpreter = NeedsInterpreter(method.Get(), 2644 method->GetEntryPointFromQuickCompiledCode()); 2645 if (enter_interpreter && !method->IsNative()) { 2646 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2647 } else { 2648 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2649 } 2650 2651 if (method->IsAbstract()) { 2652 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2653 return; 2654 } 2655 2656 if (method->IsStatic() && !method->IsConstructor()) { 2657 // For static methods excluding the class initializer, install the trampoline. 2658 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2659 // after initializing class (see ClassLinker::InitializeClass method). 2660 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2661 } else if (enter_interpreter) { 2662 if (!method->IsNative()) { 2663 // Set entry point from compiled code if there's no code or in interpreter only mode. 2664 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2665 } else { 2666 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2667 } 2668 } 2669 2670 if (method->IsNative()) { 2671 // Unregistering restores the dlsym lookup stub. 2672 method->UnregisterNative(); 2673 2674 if (enter_interpreter) { 2675 // We have a native method here without code. Then it should have either the generic JNI 2676 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2677 // TODO: this doesn't handle all the cases where trampolines may be installed. 2678 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2679 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2680 } 2681 } 2682 2683 // Allow instrumentation its chance to hijack code. 2684 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2685 method->GetEntryPointFromQuickCompiledCode()); 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 if (kUseBakerOrBrooksReadBarrier) { 2702 klass->AssertReadBarrierPointer(); 2703 } 2704 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2705 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2706 klass->SetAccessFlags(access_flags); 2707 klass->SetClassLoader(class_loader); 2708 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2709 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2710 2711 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2712 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2713 CHECK(klass->GetDexCacheStrings() != nullptr); 2714 2715 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2716 if (class_data == nullptr) { 2717 return; // no fields or methods - for example a marker interface 2718 } 2719 2720 2721 bool has_oat_class = false; 2722 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2723 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2724 &has_oat_class); 2725 if (has_oat_class) { 2726 LoadClassMembers(self, dex_file, class_data, klass, &oat_class); 2727 } 2728 } 2729 if (!has_oat_class) { 2730 LoadClassMembers(self, dex_file, class_data, klass, nullptr); 2731 } 2732} 2733 2734void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2735 const uint8_t* class_data, 2736 Handle<mirror::Class> klass, 2737 const OatFile::OatClass* oat_class) { 2738 // Load fields. 2739 ClassDataItemIterator it(dex_file, class_data); 2740 if (it.NumStaticFields() != 0) { 2741 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2742 if (UNLIKELY(statics == nullptr)) { 2743 CHECK(self->IsExceptionPending()); // OOME. 2744 return; 2745 } 2746 klass->SetSFields(statics); 2747 } 2748 if (it.NumInstanceFields() != 0) { 2749 mirror::ObjectArray<mirror::ArtField>* fields = 2750 AllocArtFieldArray(self, it.NumInstanceFields()); 2751 if (UNLIKELY(fields == nullptr)) { 2752 CHECK(self->IsExceptionPending()); // OOME. 2753 return; 2754 } 2755 klass->SetIFields(fields); 2756 } 2757 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2758 self->AllowThreadSuspension(); 2759 StackHandleScope<1> hs(self); 2760 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2761 if (UNLIKELY(sfield.Get() == nullptr)) { 2762 CHECK(self->IsExceptionPending()); // OOME. 2763 return; 2764 } 2765 klass->SetStaticField(i, sfield.Get()); 2766 LoadField(dex_file, it, klass, sfield); 2767 } 2768 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2769 self->AllowThreadSuspension(); 2770 StackHandleScope<1> hs(self); 2771 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2772 if (UNLIKELY(ifield.Get() == nullptr)) { 2773 CHECK(self->IsExceptionPending()); // OOME. 2774 return; 2775 } 2776 klass->SetInstanceField(i, ifield.Get()); 2777 LoadField(dex_file, it, klass, ifield); 2778 } 2779 2780 // Load methods. 2781 if (it.NumDirectMethods() != 0) { 2782 // TODO: append direct methods to class object 2783 mirror::ObjectArray<mirror::ArtMethod>* directs = 2784 AllocArtMethodArray(self, it.NumDirectMethods()); 2785 if (UNLIKELY(directs == nullptr)) { 2786 CHECK(self->IsExceptionPending()); // OOME. 2787 return; 2788 } 2789 klass->SetDirectMethods(directs); 2790 } 2791 if (it.NumVirtualMethods() != 0) { 2792 // TODO: append direct methods to class object 2793 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2794 AllocArtMethodArray(self, it.NumVirtualMethods()); 2795 if (UNLIKELY(virtuals == nullptr)) { 2796 CHECK(self->IsExceptionPending()); // OOME. 2797 return; 2798 } 2799 klass->SetVirtualMethods(virtuals); 2800 } 2801 size_t class_def_method_index = 0; 2802 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2803 size_t last_class_def_method_index = 0; 2804 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2805 self->AllowThreadSuspension(); 2806 StackHandleScope<1> hs(self); 2807 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2808 if (UNLIKELY(method.Get() == nullptr)) { 2809 CHECK(self->IsExceptionPending()); // OOME. 2810 return; 2811 } 2812 klass->SetDirectMethod(i, method.Get()); 2813 LinkCode(method, oat_class, class_def_method_index); 2814 uint32_t it_method_index = it.GetMemberIndex(); 2815 if (last_dex_method_index == it_method_index) { 2816 // duplicate case 2817 method->SetMethodIndex(last_class_def_method_index); 2818 } else { 2819 method->SetMethodIndex(class_def_method_index); 2820 last_dex_method_index = it_method_index; 2821 last_class_def_method_index = class_def_method_index; 2822 } 2823 class_def_method_index++; 2824 } 2825 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2826 self->AllowThreadSuspension(); 2827 StackHandleScope<1> hs(self); 2828 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2829 if (UNLIKELY(method.Get() == nullptr)) { 2830 CHECK(self->IsExceptionPending()); // OOME. 2831 return; 2832 } 2833 klass->SetVirtualMethod(i, method.Get()); 2834 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2835 LinkCode(method, oat_class, class_def_method_index); 2836 class_def_method_index++; 2837 } 2838 DCHECK(!it.HasNext()); 2839} 2840 2841void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2842 Handle<mirror::Class> klass, 2843 Handle<mirror::ArtField> dst) { 2844 uint32_t field_idx = it.GetMemberIndex(); 2845 dst->SetDexFieldIndex(field_idx); 2846 dst->SetDeclaringClass(klass.Get()); 2847 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2848} 2849 2850mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2851 const ClassDataItemIterator& it, 2852 Handle<mirror::Class> klass) { 2853 uint32_t dex_method_idx = it.GetMemberIndex(); 2854 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2855 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2856 2857 mirror::ArtMethod* dst = AllocArtMethod(self); 2858 if (UNLIKELY(dst == nullptr)) { 2859 CHECK(self->IsExceptionPending()); // OOME. 2860 return nullptr; 2861 } 2862 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2863 2864 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2865 dst->SetDexMethodIndex(dex_method_idx); 2866 dst->SetDeclaringClass(klass.Get()); 2867 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2868 2869 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2870 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2871 2872 uint32_t access_flags = it.GetMethodAccessFlags(); 2873 2874 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2875 // Set finalizable flag on declaring class. 2876 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2877 // Void return type. 2878 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2879 klass->SetFinalizable(); 2880 } else { 2881 std::string temp; 2882 const char* klass_descriptor = klass->GetDescriptor(&temp); 2883 // The Enum class declares a "final" finalize() method to prevent subclasses from 2884 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2885 // subclasses, so we exclude it here. 2886 // We also want to avoid setting the flag on Object, where we know that finalize() is 2887 // empty. 2888 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2889 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2890 klass->SetFinalizable(); 2891 } 2892 } 2893 } 2894 } else if (method_name[0] == '<') { 2895 // Fix broken access flags for initializers. Bug 11157540. 2896 bool is_init = (strcmp("<init>", method_name) == 0); 2897 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2898 if (UNLIKELY(!is_init && !is_clinit)) { 2899 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2900 } else { 2901 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2902 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2903 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2904 access_flags |= kAccConstructor; 2905 } 2906 } 2907 } 2908 dst->SetAccessFlags(access_flags); 2909 2910 return dst; 2911} 2912 2913void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2914 StackHandleScope<1> hs(self); 2915 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2916 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2917 << dex_file.GetLocation(); 2918 AppendToBootClassPath(dex_file, dex_cache); 2919} 2920 2921void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2922 Handle<mirror::DexCache> dex_cache) { 2923 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2924 boot_class_path_.push_back(&dex_file); 2925 RegisterDexFile(dex_file, dex_cache); 2926} 2927 2928bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2929 dex_lock_.AssertSharedHeld(Thread::Current()); 2930 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2931 mirror::DexCache* dex_cache = GetDexCache(i); 2932 if (dex_cache->GetDexFile() == &dex_file) { 2933 return true; 2934 } 2935 } 2936 return false; 2937} 2938 2939bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2940 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2941 return IsDexFileRegisteredLocked(dex_file); 2942} 2943 2944void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2945 Handle<mirror::DexCache> dex_cache) { 2946 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2947 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2948 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2949 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2950 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2951 dex_cache->SetDexFile(&dex_file); 2952 if (log_new_dex_caches_roots_) { 2953 // TODO: This is not safe if we can remove dex caches. 2954 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2955 } 2956} 2957 2958void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2959 Thread* self = Thread::Current(); 2960 { 2961 ReaderMutexLock mu(self, dex_lock_); 2962 if (IsDexFileRegisteredLocked(dex_file)) { 2963 return; 2964 } 2965 } 2966 // Don't alloc while holding the lock, since allocation may need to 2967 // suspend all threads and another thread may need the dex_lock_ to 2968 // get to a suspend point. 2969 StackHandleScope<1> hs(self); 2970 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2971 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2972 << dex_file.GetLocation(); 2973 { 2974 WriterMutexLock mu(self, dex_lock_); 2975 if (IsDexFileRegisteredLocked(dex_file)) { 2976 return; 2977 } 2978 RegisterDexFileLocked(dex_file, dex_cache); 2979 } 2980} 2981 2982void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2983 Handle<mirror::DexCache> dex_cache) { 2984 WriterMutexLock mu(Thread::Current(), dex_lock_); 2985 RegisterDexFileLocked(dex_file, dex_cache); 2986} 2987 2988mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2989 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2990 // Search assuming unique-ness of dex file. 2991 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2992 mirror::DexCache* dex_cache = GetDexCache(i); 2993 if (dex_cache->GetDexFile() == &dex_file) { 2994 return dex_cache; 2995 } 2996 } 2997 // Search matching by location name. 2998 std::string location(dex_file.GetLocation()); 2999 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3000 mirror::DexCache* dex_cache = GetDexCache(i); 3001 if (dex_cache->GetDexFile()->GetLocation() == location) { 3002 return dex_cache; 3003 } 3004 } 3005 // Failure, dump diagnostic and abort. 3006 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3007 mirror::DexCache* dex_cache = GetDexCache(i); 3008 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3009 } 3010 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3011 UNREACHABLE(); 3012} 3013 3014void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3015 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3016 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3017 mirror::DexCache* dex_cache = GetDexCache(i); 3018 dex_cache->Fixup(resolution_method); 3019 } 3020} 3021 3022mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3023 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3024 if (UNLIKELY(klass == nullptr)) { 3025 return nullptr; 3026 } 3027 return InitializePrimitiveClass(klass, type); 3028} 3029 3030mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3031 Primitive::Type type) { 3032 CHECK(primitive_class != nullptr); 3033 // Must hold lock on object when initializing. 3034 Thread* self = Thread::Current(); 3035 StackHandleScope<1> hs(self); 3036 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3037 ObjectLock<mirror::Class> lock(self, h_class); 3038 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3039 primitive_class->SetPrimitiveType(type); 3040 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3041 const char* descriptor = Primitive::Descriptor(type); 3042 mirror::Class* existing = InsertClass(descriptor, primitive_class, 3043 ComputeModifiedUtf8Hash(descriptor)); 3044 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3045 return primitive_class; 3046} 3047 3048// Create an array class (i.e. the class object for the array, not the 3049// array itself). "descriptor" looks like "[C" or "[[[[B" or 3050// "[Ljava/lang/String;". 3051// 3052// If "descriptor" refers to an array of primitives, look up the 3053// primitive type's internally-generated class object. 3054// 3055// "class_loader" is the class loader of the class that's referring to 3056// us. It's used to ensure that we're looking for the element type in 3057// the right context. It does NOT become the class loader for the 3058// array class; that always comes from the base element class. 3059// 3060// Returns nullptr with an exception raised on failure. 3061mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 3062 Handle<mirror::ClassLoader> class_loader) { 3063 // Identify the underlying component type 3064 CHECK_EQ('[', descriptor[0]); 3065 StackHandleScope<2> hs(self); 3066 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3067 class_loader))); 3068 if (component_type.Get() == nullptr) { 3069 DCHECK(self->IsExceptionPending()); 3070 // We need to accept erroneous classes as component types. 3071 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 3072 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get())); 3073 if (component_type.Get() == nullptr) { 3074 DCHECK(self->IsExceptionPending()); 3075 return nullptr; 3076 } else { 3077 self->ClearException(); 3078 } 3079 } 3080 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3081 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3082 return nullptr; 3083 } 3084 // See if the component type is already loaded. Array classes are 3085 // always associated with the class loader of their underlying 3086 // element type -- an array of Strings goes with the loader for 3087 // java/lang/String -- so we need to look for it there. (The 3088 // caller should have checked for the existence of the class 3089 // before calling here, but they did so with *their* class loader, 3090 // not the component type's loader.) 3091 // 3092 // If we find it, the caller adds "loader" to the class' initiating 3093 // loader list, which should prevent us from going through this again. 3094 // 3095 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3096 // are the same, because our caller (FindClass) just did the 3097 // lookup. (Even if we get this wrong we still have correct behavior, 3098 // because we effectively do this lookup again when we add the new 3099 // class to the hash table --- necessary because of possible races with 3100 // other threads.) 3101 if (class_loader.Get() != component_type->GetClassLoader()) { 3102 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader()); 3103 if (new_class != nullptr) { 3104 return new_class; 3105 } 3106 } 3107 3108 // Fill out the fields in the Class. 3109 // 3110 // It is possible to execute some methods against arrays, because 3111 // all arrays are subclasses of java_lang_Object_, so we need to set 3112 // up a vtable. We can just point at the one in java_lang_Object_. 3113 // 3114 // Array classes are simple enough that we don't need to do a full 3115 // link step. 3116 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3117 if (UNLIKELY(!init_done_)) { 3118 // Classes that were hand created, ie not by FindSystemClass 3119 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3120 new_class.Assign(GetClassRoot(kClassArrayClass)); 3121 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3122 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3123 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3124 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3125 } else if (strcmp(descriptor, 3126 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3127 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3128 } else if (strcmp(descriptor, 3129 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3130 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3131 } else if (strcmp(descriptor, "[C") == 0) { 3132 new_class.Assign(GetClassRoot(kCharArrayClass)); 3133 } else if (strcmp(descriptor, "[I") == 0) { 3134 new_class.Assign(GetClassRoot(kIntArrayClass)); 3135 } 3136 } 3137 if (new_class.Get() == nullptr) { 3138 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3139 if (new_class.Get() == nullptr) { 3140 return nullptr; 3141 } 3142 new_class->SetComponentType(component_type.Get()); 3143 } 3144 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3145 DCHECK(new_class->GetComponentType() != nullptr); 3146 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3147 new_class->SetSuperClass(java_lang_Object); 3148 new_class->SetVTable(java_lang_Object->GetVTable()); 3149 new_class->SetPrimitiveType(Primitive::kPrimNot); 3150 new_class->SetClassLoader(component_type->GetClassLoader()); 3151 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3152 { 3153 StackHandleScope<mirror::Class::kImtSize> hs2(self, 3154 Runtime::Current()->GetImtUnimplementedMethod()); 3155 new_class->PopulateEmbeddedImtAndVTable(&hs2); 3156 } 3157 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3158 // don't need to set new_class->SetObjectSize(..) 3159 // because Object::SizeOf delegates to Array::SizeOf 3160 3161 3162 // All arrays have java/lang/Cloneable and java/io/Serializable as 3163 // interfaces. We need to set that up here, so that stuff like 3164 // "instanceof" works right. 3165 // 3166 // Note: The GC could run during the call to FindSystemClass, 3167 // so we need to make sure the class object is GC-valid while we're in 3168 // there. Do this by clearing the interface list so the GC will just 3169 // think that the entries are null. 3170 3171 3172 // Use the single, global copies of "interfaces" and "iftable" 3173 // (remember not to free them for arrays). 3174 { 3175 mirror::IfTable* array_iftable = array_iftable_.Read(); 3176 CHECK(array_iftable != nullptr); 3177 new_class->SetIfTable(array_iftable); 3178 } 3179 3180 // Inherit access flags from the component type. 3181 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3182 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3183 access_flags &= kAccJavaFlagsMask; 3184 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3185 // and remove "interface". 3186 access_flags |= kAccAbstract | kAccFinal; 3187 access_flags &= ~kAccInterface; 3188 3189 new_class->SetAccessFlags(access_flags); 3190 3191 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 3192 if (existing == nullptr) { 3193 return new_class.Get(); 3194 } 3195 // Another thread must have loaded the class after we 3196 // started but before we finished. Abandon what we've 3197 // done. 3198 // 3199 // (Yes, this happens.) 3200 3201 return existing; 3202} 3203 3204mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3205 switch (type) { 3206 case 'B': 3207 return GetClassRoot(kPrimitiveByte); 3208 case 'C': 3209 return GetClassRoot(kPrimitiveChar); 3210 case 'D': 3211 return GetClassRoot(kPrimitiveDouble); 3212 case 'F': 3213 return GetClassRoot(kPrimitiveFloat); 3214 case 'I': 3215 return GetClassRoot(kPrimitiveInt); 3216 case 'J': 3217 return GetClassRoot(kPrimitiveLong); 3218 case 'S': 3219 return GetClassRoot(kPrimitiveShort); 3220 case 'Z': 3221 return GetClassRoot(kPrimitiveBoolean); 3222 case 'V': 3223 return GetClassRoot(kPrimitiveVoid); 3224 default: 3225 break; 3226 } 3227 std::string printable_type(PrintableChar(type)); 3228 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3229 return nullptr; 3230} 3231 3232mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3233 size_t hash) { 3234 if (VLOG_IS_ON(class_linker)) { 3235 mirror::DexCache* dex_cache = klass->GetDexCache(); 3236 std::string source; 3237 if (dex_cache != nullptr) { 3238 source += " from "; 3239 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3240 } 3241 LOG(INFO) << "Loaded class " << descriptor << source; 3242 } 3243 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3244 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3245 if (existing != nullptr) { 3246 return existing; 3247 } 3248 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3249 dex_cache_image_class_lookup_required_) { 3250 // Check a class loaded with the system class loader matches one in the image if the class 3251 // is in the image. 3252 existing = LookupClassFromImage(descriptor); 3253 if (existing != nullptr) { 3254 CHECK_EQ(klass, existing); 3255 } 3256 } 3257 VerifyObject(klass); 3258 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 3259 if (log_new_class_table_roots_) { 3260 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3261 } 3262 return nullptr; 3263} 3264 3265mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3266 size_t hash) { 3267 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3268 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 3269 hash); 3270 if (existing_it == class_table_.end()) { 3271 CHECK(klass->IsProxyClass()); 3272 return nullptr; 3273 } 3274 3275 mirror::Class* existing = existing_it->Read(); 3276 CHECK_NE(existing, klass) << descriptor; 3277 CHECK(!existing->IsResolved()) << descriptor; 3278 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3279 3280 CHECK(!klass->IsTemp()) << descriptor; 3281 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3282 dex_cache_image_class_lookup_required_) { 3283 // Check a class loaded with the system class loader matches one in the image if the class 3284 // is in the image. 3285 existing = LookupClassFromImage(descriptor); 3286 if (existing != nullptr) { 3287 CHECK_EQ(klass, existing) << descriptor; 3288 } 3289 } 3290 VerifyObject(klass); 3291 3292 // Update the element in the hash set. 3293 *existing_it = GcRoot<mirror::Class>(klass); 3294 if (log_new_class_table_roots_) { 3295 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3296 } 3297 3298 return existing; 3299} 3300 3301bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 3302 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3303 auto pair = std::make_pair(descriptor, class_loader); 3304 auto it = class_table_.Find(pair); 3305 if (it != class_table_.end()) { 3306 class_table_.Erase(it); 3307 return true; 3308 } 3309 it = pre_zygote_class_table_.Find(pair); 3310 if (it != pre_zygote_class_table_.end()) { 3311 pre_zygote_class_table_.Erase(it); 3312 return true; 3313 } 3314 return false; 3315} 3316 3317mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, size_t hash, 3318 mirror::ClassLoader* class_loader) { 3319 { 3320 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3321 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3322 if (result != nullptr) { 3323 return result; 3324 } 3325 } 3326 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3327 return nullptr; 3328 } else { 3329 // Lookup failed but need to search dex_caches_. 3330 mirror::Class* result = LookupClassFromImage(descriptor); 3331 if (result != nullptr) { 3332 InsertClass(descriptor, result, hash); 3333 } else { 3334 // Searching the image dex files/caches failed, we don't want to get into this situation 3335 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3336 // classes into the class table. 3337 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3338 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3339 MoveImageClassesToClassTable(); 3340 } 3341 } 3342 return result; 3343 } 3344} 3345 3346mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3347 mirror::ClassLoader* class_loader, 3348 size_t hash) { 3349 auto descriptor_pair = std::make_pair(descriptor, class_loader); 3350 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 3351 if (it == pre_zygote_class_table_.end()) { 3352 it = class_table_.FindWithHash(descriptor_pair, hash); 3353 if (it == class_table_.end()) { 3354 return nullptr; 3355 } 3356 } 3357 return it->Read(); 3358} 3359 3360static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3361 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3362 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3363 CHECK(image != nullptr); 3364 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3365 return root->AsObjectArray<mirror::DexCache>(); 3366} 3367 3368void ClassLinker::MoveImageClassesToClassTable() { 3369 Thread* self = Thread::Current(); 3370 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3371 if (!dex_cache_image_class_lookup_required_) { 3372 return; // All dex cache classes are already in the class table. 3373 } 3374 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3375 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3376 std::string temp; 3377 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3378 mirror::DexCache* dex_cache = dex_caches->Get(i); 3379 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3380 for (int32_t j = 0; j < types->GetLength(); j++) { 3381 mirror::Class* klass = types->Get(j); 3382 if (klass != nullptr) { 3383 DCHECK(klass->GetClassLoader() == nullptr); 3384 const char* descriptor = klass->GetDescriptor(&temp); 3385 size_t hash = ComputeModifiedUtf8Hash(descriptor); 3386 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3387 if (existing != nullptr) { 3388 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 3389 << PrettyClassAndClassLoader(klass); 3390 } else { 3391 class_table_.Insert(GcRoot<mirror::Class>(klass)); 3392 if (log_new_class_table_roots_) { 3393 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3394 } 3395 } 3396 } 3397 } 3398 } 3399 dex_cache_image_class_lookup_required_ = false; 3400} 3401 3402void ClassLinker::MoveClassTableToPreZygote() { 3403 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3404 DCHECK(pre_zygote_class_table_.Empty()); 3405 pre_zygote_class_table_ = std::move(class_table_); 3406 class_table_.Clear(); 3407} 3408 3409mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3410 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3411 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3412 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3413 mirror::DexCache* dex_cache = dex_caches->Get(i); 3414 const DexFile* dex_file = dex_cache->GetDexFile(); 3415 // Try binary searching the string/type index. 3416 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3417 if (string_id != nullptr) { 3418 const DexFile::TypeId* type_id = 3419 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3420 if (type_id != nullptr) { 3421 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3422 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3423 if (klass != nullptr) { 3424 return klass; 3425 } 3426 } 3427 } 3428 } 3429 return nullptr; 3430} 3431 3432void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3433 result.clear(); 3434 if (dex_cache_image_class_lookup_required_) { 3435 MoveImageClassesToClassTable(); 3436 } 3437 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3438 while (true) { 3439 auto it = class_table_.Find(descriptor); 3440 if (it == class_table_.end()) { 3441 break; 3442 } 3443 result.push_back(it->Read()); 3444 class_table_.Erase(it); 3445 } 3446 for (mirror::Class* k : result) { 3447 class_table_.Insert(GcRoot<mirror::Class>(k)); 3448 } 3449 size_t pre_zygote_start = result.size(); 3450 // Now handle the pre zygote table. 3451 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 3452 // called from the debugger. 3453 while (true) { 3454 auto it = pre_zygote_class_table_.Find(descriptor); 3455 if (it == pre_zygote_class_table_.end()) { 3456 break; 3457 } 3458 result.push_back(it->Read()); 3459 pre_zygote_class_table_.Erase(it); 3460 } 3461 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 3462 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 3463 } 3464} 3465 3466void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3467 // TODO: assert that the monitor on the Class is held 3468 ObjectLock<mirror::Class> lock(self, klass); 3469 3470 // Don't attempt to re-verify if already sufficiently verified. 3471 if (klass->IsVerified()) { 3472 EnsurePreverifiedMethods(klass); 3473 return; 3474 } 3475 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3476 return; 3477 } 3478 3479 // The class might already be erroneous, for example at compile time if we attempted to verify 3480 // this class as a parent to another. 3481 if (klass->IsErroneous()) { 3482 ThrowEarlierClassFailure(klass.Get()); 3483 return; 3484 } 3485 3486 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3487 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3488 } else { 3489 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3490 << PrettyClass(klass.Get()); 3491 CHECK(!Runtime::Current()->IsCompiler()); 3492 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3493 } 3494 3495 // Skip verification if disabled. 3496 if (!Runtime::Current()->IsVerificationEnabled()) { 3497 klass->SetStatus(mirror::Class::kStatusVerified, self); 3498 EnsurePreverifiedMethods(klass); 3499 return; 3500 } 3501 3502 // Verify super class. 3503 StackHandleScope<2> hs(self); 3504 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3505 if (super.Get() != nullptr) { 3506 // Acquire lock to prevent races on verifying the super class. 3507 ObjectLock<mirror::Class> super_lock(self, super); 3508 3509 if (!super->IsVerified() && !super->IsErroneous()) { 3510 VerifyClass(self, super); 3511 } 3512 if (!super->IsCompileTimeVerified()) { 3513 std::string error_msg( 3514 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3515 PrettyDescriptor(klass.Get()).c_str(), 3516 PrettyDescriptor(super.Get()).c_str())); 3517 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3518 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3519 if (cause.Get() != nullptr) { 3520 self->ClearException(); 3521 } 3522 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3523 if (cause.Get() != nullptr) { 3524 self->GetException(nullptr)->SetCause(cause.Get()); 3525 } 3526 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3527 if (Runtime::Current()->IsCompiler()) { 3528 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3529 } 3530 klass->SetStatus(mirror::Class::kStatusError, self); 3531 return; 3532 } 3533 } 3534 3535 // Try to use verification information from the oat file, otherwise do runtime verification. 3536 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3537 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3538 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3539 if (oat_file_class_status == mirror::Class::kStatusError) { 3540 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3541 << PrettyDescriptor(klass.Get()) << " in " 3542 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3543 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3544 PrettyDescriptor(klass.Get()).c_str()); 3545 klass->SetStatus(mirror::Class::kStatusError, self); 3546 return; 3547 } 3548 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3549 std::string error_msg; 3550 if (!preverified) { 3551 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3552 Runtime::Current()->IsCompiler(), 3553 &error_msg); 3554 } 3555 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3556 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3557 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3558 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3559 << " because: " << error_msg; 3560 } 3561 self->AssertNoPendingException(); 3562 // Make sure all classes referenced by catch blocks are resolved. 3563 ResolveClassExceptionHandlerTypes(dex_file, klass); 3564 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3565 // Even though there were no verifier failures we need to respect whether the super-class 3566 // was verified or requiring runtime reverification. 3567 if (super.Get() == nullptr || super->IsVerified()) { 3568 klass->SetStatus(mirror::Class::kStatusVerified, self); 3569 } else { 3570 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3571 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3572 // Pretend a soft failure occured so that we don't consider the class verified below. 3573 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3574 } 3575 } else { 3576 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3577 // Soft failures at compile time should be retried at runtime. Soft 3578 // failures at runtime will be handled by slow paths in the generated 3579 // code. Set status accordingly. 3580 if (Runtime::Current()->IsCompiler()) { 3581 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3582 } else { 3583 klass->SetStatus(mirror::Class::kStatusVerified, self); 3584 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3585 // later. 3586 klass->SetPreverified(); 3587 } 3588 } 3589 } else { 3590 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3591 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3592 << " because: " << error_msg; 3593 self->AssertNoPendingException(); 3594 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3595 klass->SetStatus(mirror::Class::kStatusError, self); 3596 } 3597 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3598 // Class is verified so we don't need to do any access check on its methods. 3599 // Let the interpreter know it by setting the kAccPreverified flag onto each 3600 // method. 3601 // Note: we're going here during compilation and at runtime. When we set the 3602 // kAccPreverified flag when compiling image classes, the flag is recorded 3603 // in the image and is set when loading the image. 3604 EnsurePreverifiedMethods(klass); 3605 } 3606} 3607 3608void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3609 if (!klass->IsPreverified()) { 3610 klass->SetPreverifiedFlagOnAllMethods(); 3611 klass->SetPreverified(); 3612 } 3613} 3614 3615bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3616 mirror::Class::Status& oat_file_class_status) { 3617 // If we're compiling, we can only verify the class using the oat file if 3618 // we are not compiling the image or if the class we're verifying is not part of 3619 // the app. In other words, we will only check for preverification of bootclasspath 3620 // classes. 3621 if (Runtime::Current()->IsCompiler()) { 3622 // Are we compiling the bootclasspath? 3623 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3624 return false; 3625 } 3626 // We are compiling an app (not the image). 3627 3628 // Is this an app class? (I.e. not a bootclasspath class) 3629 if (klass->GetClassLoader() != nullptr) { 3630 return false; 3631 } 3632 } 3633 3634 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3635 // In case we run without an image there won't be a backing oat file. 3636 if (oat_dex_file == nullptr) { 3637 return false; 3638 } 3639 3640 // We may be running with a preopted oat file but without image. In this case, 3641 // we don't skip verification of preverified classes to ensure we initialize 3642 // dex caches with all types resolved during verification. 3643 // We need to trust image classes, as these might be coming out of a pre-opted, quickened boot 3644 // image (that we just failed loading), and the verifier can't be run on quickened opcodes when 3645 // the runtime isn't started. On the other hand, app classes can be re-verified even if they are 3646 // already pre-opted, as then the runtime is started. 3647 if (!Runtime::Current()->IsCompiler() && 3648 !Runtime::Current()->GetHeap()->HasImageSpace() && 3649 klass->GetClassLoader() != nullptr) { 3650 return false; 3651 } 3652 3653 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3654 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3655 if (oat_file_class_status == mirror::Class::kStatusVerified || 3656 oat_file_class_status == mirror::Class::kStatusInitialized) { 3657 return true; 3658 } 3659 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3660 // Compile time verification failed with a soft error. Compile time verification can fail 3661 // because we have incomplete type information. Consider the following: 3662 // class ... { 3663 // Foo x; 3664 // .... () { 3665 // if (...) { 3666 // v1 gets assigned a type of resolved class Foo 3667 // } else { 3668 // v1 gets assigned a type of unresolved class Bar 3669 // } 3670 // iput x = v1 3671 // } } 3672 // when we merge v1 following the if-the-else it results in Conflict 3673 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3674 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3675 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3676 // at compile time). 3677 return false; 3678 } 3679 if (oat_file_class_status == mirror::Class::kStatusError) { 3680 // Compile time verification failed with a hard error. This is caused by invalid instructions 3681 // in the class. These errors are unrecoverable. 3682 return false; 3683 } 3684 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3685 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3686 // not loading the class. 3687 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3688 // isn't a problem and this case shouldn't occur 3689 return false; 3690 } 3691 std::string temp; 3692 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3693 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3694 << klass->GetDescriptor(&temp); 3695 UNREACHABLE(); 3696} 3697 3698void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3699 Handle<mirror::Class> klass) { 3700 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3701 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3702 } 3703 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3704 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3705 } 3706} 3707 3708void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3709 mirror::ArtMethod* method) { 3710 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3711 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3712 if (code_item == nullptr) { 3713 return; // native or abstract method 3714 } 3715 if (code_item->tries_size_ == 0) { 3716 return; // nothing to process 3717 } 3718 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3719 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3720 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3721 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3722 CatchHandlerIterator iterator(handlers_ptr); 3723 for (; iterator.HasNext(); iterator.Next()) { 3724 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3725 // unresolved exception types will be ignored by exception delivery 3726 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3727 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3728 if (exception_type == nullptr) { 3729 DCHECK(Thread::Current()->IsExceptionPending()); 3730 Thread::Current()->ClearException(); 3731 } 3732 } 3733 } 3734 handlers_ptr = iterator.EndDataPointer(); 3735 } 3736} 3737 3738static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3739static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3740 Handle<mirror::ArtMethod> prototype); 3741 3742mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3743 jobjectArray interfaces, jobject loader, 3744 jobjectArray methods, jobjectArray throws) { 3745 Thread* self = soa.Self(); 3746 StackHandleScope<8> hs(self); 3747 MutableHandle<mirror::Class> klass(hs.NewHandle( 3748 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3749 if (klass.Get() == nullptr) { 3750 CHECK(self->IsExceptionPending()); // OOME. 3751 return nullptr; 3752 } 3753 DCHECK(klass->GetClass() != nullptr); 3754 klass->SetObjectSize(sizeof(mirror::Proxy)); 3755 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3756 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3757 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3758 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3759 klass->SetName(soa.Decode<mirror::String*>(name)); 3760 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3761 klass->SetDexCache(proxy_class->GetDexCache()); 3762 klass->SetStatus(mirror::Class::kStatusIdx, self); 3763 3764 // Instance fields are inherited, but we add a couple of static fields... 3765 { 3766 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3767 if (UNLIKELY(sfields == nullptr)) { 3768 CHECK(self->IsExceptionPending()); // OOME. 3769 return nullptr; 3770 } 3771 klass->SetSFields(sfields); 3772 } 3773 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3774 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3775 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3776 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3777 CHECK(self->IsExceptionPending()); // OOME. 3778 return nullptr; 3779 } 3780 klass->SetStaticField(0, interfaces_sfield.Get()); 3781 interfaces_sfield->SetDexFieldIndex(0); 3782 interfaces_sfield->SetDeclaringClass(klass.Get()); 3783 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3784 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3785 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3786 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3787 CHECK(self->IsExceptionPending()); // OOME. 3788 return nullptr; 3789 } 3790 klass->SetStaticField(1, throws_sfield.Get()); 3791 throws_sfield->SetDexFieldIndex(1); 3792 throws_sfield->SetDeclaringClass(klass.Get()); 3793 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3794 3795 // Proxies have 1 direct method, the constructor 3796 { 3797 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3798 if (UNLIKELY(directs == nullptr)) { 3799 CHECK(self->IsExceptionPending()); // OOME. 3800 return nullptr; 3801 } 3802 klass->SetDirectMethods(directs); 3803 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3804 if (UNLIKELY(constructor == nullptr)) { 3805 CHECK(self->IsExceptionPending()); // OOME. 3806 return nullptr; 3807 } 3808 klass->SetDirectMethod(0, constructor); 3809 } 3810 3811 // Create virtual method using specified prototypes. 3812 size_t num_virtual_methods = 3813 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3814 { 3815 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3816 num_virtual_methods); 3817 if (UNLIKELY(virtuals == nullptr)) { 3818 CHECK(self->IsExceptionPending()); // OOME. 3819 return nullptr; 3820 } 3821 klass->SetVirtualMethods(virtuals); 3822 } 3823 for (size_t i = 0; i < num_virtual_methods; ++i) { 3824 StackHandleScope<1> hs2(self); 3825 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3826 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3827 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3828 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3829 if (UNLIKELY(clone == nullptr)) { 3830 CHECK(self->IsExceptionPending()); // OOME. 3831 return nullptr; 3832 } 3833 klass->SetVirtualMethod(i, clone); 3834 } 3835 3836 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3837 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3838 self->AssertNoPendingException(); 3839 3840 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3841 mirror::Class* new_class = nullptr; 3842 { 3843 // Must hold lock on object when resolved. 3844 ObjectLock<mirror::Class> resolution_lock(self, klass); 3845 // Link the fields and virtual methods, creating vtable and iftables 3846 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3847 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3848 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3849 klass->SetStatus(mirror::Class::kStatusError, self); 3850 return nullptr; 3851 } 3852 } 3853 3854 CHECK(klass->IsRetired()); 3855 CHECK_NE(klass.Get(), new_class); 3856 klass.Assign(new_class); 3857 3858 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3859 interfaces_sfield->SetObject<false>(klass.Get(), 3860 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3861 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3862 throws_sfield->SetObject<false>(klass.Get(), 3863 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3864 3865 { 3866 // Lock on klass is released. Lock new class object. 3867 ObjectLock<mirror::Class> initialization_lock(self, klass); 3868 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3869 } 3870 3871 // sanity checks 3872 if (kIsDebugBuild) { 3873 CHECK(klass->GetIFields() == nullptr); 3874 CheckProxyConstructor(klass->GetDirectMethod(0)); 3875 for (size_t i = 0; i < num_virtual_methods; ++i) { 3876 StackHandleScope<2> hs2(self); 3877 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3878 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3879 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3880 Handle<mirror::ArtMethod> virtual_method(hs2.NewHandle(klass->GetVirtualMethod(i))); 3881 CheckProxyMethod(virtual_method, prototype); 3882 } 3883 3884 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3885 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3886 decoded_name->ToModifiedUtf8().c_str())); 3887 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3888 3889 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3890 decoded_name->ToModifiedUtf8().c_str())); 3891 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3892 3893 CHECK_EQ(klass.Get()->GetInterfaces(), 3894 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3895 CHECK_EQ(klass.Get()->GetThrows(), 3896 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3897 } 3898 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3899 ComputeModifiedUtf8Hash(descriptor.c_str())); 3900 CHECK(existing == nullptr); 3901 return klass.Get(); 3902} 3903 3904std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3905 DCHECK(proxy_class->IsProxyClass()); 3906 mirror::String* name = proxy_class->GetName(); 3907 DCHECK(name != nullptr); 3908 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3909} 3910 3911mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3912 mirror::ArtMethod* proxy_method) { 3913 DCHECK(proxy_class->IsProxyClass()); 3914 DCHECK(proxy_method->IsProxyMethod()); 3915 // Locate the dex cache of the original interface/Object 3916 mirror::DexCache* dex_cache = nullptr; 3917 { 3918 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3919 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3920 mirror::DexCache* a_dex_cache = GetDexCache(i); 3921 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3922 dex_cache = a_dex_cache; 3923 break; 3924 } 3925 } 3926 } 3927 CHECK(dex_cache != nullptr); 3928 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3929 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3930 CHECK(resolved_method != nullptr); 3931 return resolved_method; 3932} 3933 3934 3935mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3936 Handle<mirror::Class> klass, 3937 mirror::Class* proxy_class) { 3938 // Create constructor for Proxy that must initialize h 3939 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3940 proxy_class->GetDirectMethods(); 3941 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3942 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3943 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3944 // constructor method. 3945 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3946 proxy_constructor); 3947 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3948 // code_ too) 3949 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3950 if (constructor == nullptr) { 3951 CHECK(self->IsExceptionPending()); // OOME. 3952 return nullptr; 3953 } 3954 // Make this constructor public and fix the class to be our Proxy version 3955 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3956 constructor->SetDeclaringClass(klass.Get()); 3957 return constructor; 3958} 3959 3960static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3961 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3962 CHECK(constructor->IsConstructor()); 3963 CHECK_STREQ(constructor->GetName(), "<init>"); 3964 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3965 "(Ljava/lang/reflect/InvocationHandler;)V"); 3966 DCHECK(constructor->IsPublic()); 3967} 3968 3969mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3970 Handle<mirror::Class> klass, 3971 Handle<mirror::ArtMethod> prototype) { 3972 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3973 // prototype method 3974 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3975 prototype.Get()); 3976 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3977 // as necessary 3978 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3979 if (UNLIKELY(method == nullptr)) { 3980 CHECK(self->IsExceptionPending()); // OOME. 3981 return nullptr; 3982 } 3983 3984 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3985 // the intersection of throw exceptions as defined in Proxy 3986 method->SetDeclaringClass(klass.Get()); 3987 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3988 3989 // At runtime the method looks like a reference and argument saving method, clone the code 3990 // related parameters from this method. 3991 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3992 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3993 3994 return method; 3995} 3996 3997static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3998 Handle<mirror::ArtMethod> prototype) 3999 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4000 // Basic sanity 4001 CHECK(!prototype->IsFinal()); 4002 CHECK(method->IsFinal()); 4003 CHECK(!method->IsAbstract()); 4004 4005 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4006 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4007 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4008 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4009 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4010 4011 CHECK_STREQ(method->GetName(), prototype->GetName()); 4012 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4013 // More complex sanity - via dex cache 4014 CHECK_EQ(method->GetInterfaceMethodIfProxy()->GetReturnType(), prototype->GetReturnType()); 4015} 4016 4017static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4018 bool can_init_parents) 4019 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4020 if (can_init_statics && can_init_parents) { 4021 return true; 4022 } 4023 if (!can_init_statics) { 4024 // Check if there's a class initializer. 4025 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4026 if (clinit != nullptr) { 4027 return false; 4028 } 4029 // Check if there are encoded static values needing initialization. 4030 if (klass->NumStaticFields() != 0) { 4031 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4032 DCHECK(dex_class_def != nullptr); 4033 if (dex_class_def->static_values_off_ != 0) { 4034 return false; 4035 } 4036 } 4037 } 4038 if (!klass->IsInterface() && klass->HasSuperClass()) { 4039 mirror::Class* super_class = klass->GetSuperClass(); 4040 if (!can_init_parents && !super_class->IsInitialized()) { 4041 return false; 4042 } else { 4043 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4044 return false; 4045 } 4046 } 4047 } 4048 return true; 4049} 4050 4051bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4052 bool can_init_statics, bool can_init_parents) { 4053 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4054 4055 // Are we already initialized and therefore done? 4056 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4057 // an initialized class will never change its state. 4058 if (klass->IsInitialized()) { 4059 return true; 4060 } 4061 4062 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4063 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4064 return false; 4065 } 4066 4067 self->AllowThreadSuspension(); 4068 uint64_t t0; 4069 { 4070 ObjectLock<mirror::Class> lock(self, klass); 4071 4072 // Re-check under the lock in case another thread initialized ahead of us. 4073 if (klass->IsInitialized()) { 4074 return true; 4075 } 4076 4077 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4078 if (klass->IsErroneous()) { 4079 ThrowEarlierClassFailure(klass.Get()); 4080 VlogClassInitializationFailure(klass); 4081 return false; 4082 } 4083 4084 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4085 4086 if (!klass->IsVerified()) { 4087 VerifyClass(self, klass); 4088 if (!klass->IsVerified()) { 4089 // We failed to verify, expect either the klass to be erroneous or verification failed at 4090 // compile time. 4091 if (klass->IsErroneous()) { 4092 CHECK(self->IsExceptionPending()); 4093 VlogClassInitializationFailure(klass); 4094 } else { 4095 CHECK(Runtime::Current()->IsCompiler()); 4096 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4097 } 4098 return false; 4099 } else { 4100 self->AssertNoPendingException(); 4101 } 4102 } 4103 4104 // If the class is kStatusInitializing, either this thread is 4105 // initializing higher up the stack or another thread has beat us 4106 // to initializing and we need to wait. Either way, this 4107 // invocation of InitializeClass will not be responsible for 4108 // running <clinit> and will return. 4109 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4110 // Could have got an exception during verification. 4111 if (self->IsExceptionPending()) { 4112 VlogClassInitializationFailure(klass); 4113 return false; 4114 } 4115 // We caught somebody else in the act; was it us? 4116 if (klass->GetClinitThreadId() == self->GetTid()) { 4117 // Yes. That's fine. Return so we can continue initializing. 4118 return true; 4119 } 4120 // No. That's fine. Wait for another thread to finish initializing. 4121 return WaitForInitializeClass(klass, self, lock); 4122 } 4123 4124 if (!ValidateSuperClassDescriptors(klass)) { 4125 klass->SetStatus(mirror::Class::kStatusError, self); 4126 return false; 4127 } 4128 self->AllowThreadSuspension(); 4129 4130 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4131 4132 // From here out other threads may observe that we're initializing and so changes of state 4133 // require the a notification. 4134 klass->SetClinitThreadId(self->GetTid()); 4135 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4136 4137 t0 = NanoTime(); 4138 } 4139 4140 // Initialize super classes, must be done while initializing for the JLS. 4141 if (!klass->IsInterface() && klass->HasSuperClass()) { 4142 mirror::Class* super_class = klass->GetSuperClass(); 4143 if (!super_class->IsInitialized()) { 4144 CHECK(!super_class->IsInterface()); 4145 CHECK(can_init_parents); 4146 StackHandleScope<1> hs(self); 4147 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4148 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4149 if (!super_initialized) { 4150 // The super class was verified ahead of entering initializing, we should only be here if 4151 // the super class became erroneous due to initialization. 4152 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4153 << "Super class initialization failed for " 4154 << PrettyDescriptor(handle_scope_super.Get()) 4155 << " that has unexpected status " << handle_scope_super->GetStatus() 4156 << "\nPending exception:\n" 4157 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4158 ObjectLock<mirror::Class> lock(self, klass); 4159 // Initialization failed because the super-class is erroneous. 4160 klass->SetStatus(mirror::Class::kStatusError, self); 4161 return false; 4162 } 4163 } 4164 } 4165 4166 const size_t num_static_fields = klass->NumStaticFields(); 4167 if (num_static_fields > 0) { 4168 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4169 CHECK(dex_class_def != nullptr); 4170 const DexFile& dex_file = klass->GetDexFile(); 4171 StackHandleScope<3> hs(self); 4172 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4173 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4174 4175 // Eagerly fill in static fields so that the we don't have to do as many expensive 4176 // Class::FindStaticField in ResolveField. 4177 for (size_t i = 0; i < num_static_fields; ++i) { 4178 mirror::ArtField* field = klass->GetStaticField(i); 4179 const uint32_t field_idx = field->GetDexFieldIndex(); 4180 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 4181 if (resolved_field == nullptr) { 4182 dex_cache->SetResolvedField(field_idx, field); 4183 } else { 4184 DCHECK_EQ(field, resolved_field); 4185 } 4186 } 4187 4188 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4189 this, *dex_class_def); 4190 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4191 ClassDataItemIterator field_it(dex_file, class_data); 4192 if (value_it.HasNext()) { 4193 DCHECK(field_it.HasNextStaticField()); 4194 CHECK(can_init_statics); 4195 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4196 StackHandleScope<1> hs2(self); 4197 Handle<mirror::ArtField> field(hs2.NewHandle( 4198 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4199 if (Runtime::Current()->IsActiveTransaction()) { 4200 value_it.ReadValueToField<true>(field); 4201 } else { 4202 value_it.ReadValueToField<false>(field); 4203 } 4204 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4205 } 4206 } 4207 } 4208 4209 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4210 if (clinit != nullptr) { 4211 CHECK(can_init_statics); 4212 JValue result; 4213 clinit->Invoke(self, nullptr, 0, &result, "V"); 4214 } 4215 4216 self->AllowThreadSuspension(); 4217 uint64_t t1 = NanoTime(); 4218 4219 bool success = true; 4220 { 4221 ObjectLock<mirror::Class> lock(self, klass); 4222 4223 if (self->IsExceptionPending()) { 4224 WrapExceptionInInitializer(klass); 4225 klass->SetStatus(mirror::Class::kStatusError, self); 4226 success = false; 4227 } else { 4228 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4229 RuntimeStats* thread_stats = self->GetStats(); 4230 ++global_stats->class_init_count; 4231 ++thread_stats->class_init_count; 4232 global_stats->class_init_time_ns += (t1 - t0); 4233 thread_stats->class_init_time_ns += (t1 - t0); 4234 // Set the class as initialized except if failed to initialize static fields. 4235 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4236 if (VLOG_IS_ON(class_linker)) { 4237 std::string temp; 4238 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4239 klass->GetLocation(); 4240 } 4241 // Opportunistically set static method trampolines to their destination. 4242 FixupStaticTrampolines(klass.Get()); 4243 } 4244 } 4245 return success; 4246} 4247 4248bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4249 ObjectLock<mirror::Class>& lock) 4250 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4251 while (true) { 4252 self->AssertNoPendingException(); 4253 CHECK(!klass->IsInitialized()); 4254 lock.WaitIgnoringInterrupts(); 4255 4256 // When we wake up, repeat the test for init-in-progress. If 4257 // there's an exception pending (only possible if 4258 // we were not using WaitIgnoringInterrupts), bail out. 4259 if (self->IsExceptionPending()) { 4260 WrapExceptionInInitializer(klass); 4261 klass->SetStatus(mirror::Class::kStatusError, self); 4262 return false; 4263 } 4264 // Spurious wakeup? Go back to waiting. 4265 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4266 continue; 4267 } 4268 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4269 // Compile time initialization failed. 4270 return false; 4271 } 4272 if (klass->IsErroneous()) { 4273 // The caller wants an exception, but it was thrown in a 4274 // different thread. Synthesize one here. 4275 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4276 PrettyDescriptor(klass.Get()).c_str()); 4277 VlogClassInitializationFailure(klass); 4278 return false; 4279 } 4280 if (klass->IsInitialized()) { 4281 return true; 4282 } 4283 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4284 << klass->GetStatus(); 4285 } 4286 UNREACHABLE(); 4287} 4288 4289static bool HasSameSignatureWithDifferentClassLoaders(Thread* self, 4290 Handle<mirror::ArtMethod> method1, 4291 Handle<mirror::ArtMethod> method2) 4292 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4293 { 4294 StackHandleScope<1> hs(self); 4295 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType())); 4296 if (UNLIKELY(method2->GetReturnType() != return_type.Get())) { 4297 return false; 4298 } 4299 } 4300 const DexFile::TypeList* types1 = method1->GetParameterTypeList(); 4301 const DexFile::TypeList* types2 = method2->GetParameterTypeList(); 4302 if (types1 == nullptr) { 4303 return (types2 == nullptr) || (types2->Size() == 0); 4304 } else if (UNLIKELY(types2 == nullptr)) { 4305 return types1->Size() == 0; 4306 } 4307 uint32_t num_types = types1->Size(); 4308 if (UNLIKELY(num_types != types2->Size())) { 4309 return false; 4310 } 4311 for (uint32_t i = 0; i < num_types; ++i) { 4312 mirror::Class* param_type = 4313 method1->GetClassFromTypeIndex(types1->GetTypeItem(i).type_idx_, true); 4314 mirror::Class* other_param_type = 4315 method2->GetClassFromTypeIndex(types2->GetTypeItem(i).type_idx_, true); 4316 if (UNLIKELY(param_type != other_param_type)) { 4317 return false; 4318 } 4319 } 4320 return true; 4321} 4322 4323 4324bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4325 if (klass->IsInterface()) { 4326 return true; 4327 } 4328 // Begin with the methods local to the superclass. 4329 Thread* self = Thread::Current(); 4330 StackHandleScope<2> hs(self); 4331 MutableHandle<mirror::ArtMethod> h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4332 MutableHandle<mirror::ArtMethod> super_h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4333 if (klass->HasSuperClass() && 4334 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4335 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4336 h_m.Assign(klass->GetVTableEntry(i)); 4337 super_h_m.Assign(klass->GetSuperClass()->GetVTableEntry(i)); 4338 if (h_m.Get() != super_h_m.Get() && 4339 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4340 ThrowLinkageError(klass.Get(), 4341 "Class %s method %s resolves differently in superclass %s", 4342 PrettyDescriptor(klass.Get()).c_str(), 4343 PrettyMethod(h_m.Get()).c_str(), 4344 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4345 return false; 4346 } 4347 } 4348 } 4349 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4350 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4351 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4352 for (uint32_t j = 0; j < num_methods; ++j) { 4353 h_m.Assign(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4354 super_h_m.Assign(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4355 if (h_m.Get() != super_h_m.Get() && 4356 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4357 ThrowLinkageError(klass.Get(), 4358 "Class %s method %s resolves differently in interface %s", 4359 PrettyDescriptor(klass.Get()).c_str(), 4360 PrettyMethod(h_m.Get()).c_str(), 4361 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4362 return false; 4363 } 4364 } 4365 } 4366 } 4367 return true; 4368} 4369 4370bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4371 bool can_init_parents) { 4372 DCHECK(c.Get() != nullptr); 4373 if (c->IsInitialized()) { 4374 EnsurePreverifiedMethods(c); 4375 return true; 4376 } 4377 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4378 if (!success) { 4379 if (can_init_fields && can_init_parents) { 4380 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4381 } 4382 } else { 4383 self->AssertNoPendingException(); 4384 } 4385 return success; 4386} 4387 4388void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4389 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4390 if (fields != nullptr) { 4391 for (int index = 0; index < fields->GetLength(); index ++) { 4392 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4393 fields->Get(index)->SetDeclaringClass(new_class); 4394 } 4395 } 4396 } 4397 4398 fields = new_class->GetSFields(); 4399 if (fields != nullptr) { 4400 for (int index = 0; index < fields->GetLength(); index ++) { 4401 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4402 fields->Get(index)->SetDeclaringClass(new_class); 4403 } 4404 } 4405 } 4406 4407 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4408 if (methods != nullptr) { 4409 for (int index = 0; index < methods->GetLength(); index ++) { 4410 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4411 methods->Get(index)->SetDeclaringClass(new_class); 4412 } 4413 } 4414 } 4415 4416 methods = new_class->GetVirtualMethods(); 4417 if (methods != nullptr) { 4418 for (int index = 0; index < methods->GetLength(); index ++) { 4419 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4420 methods->Get(index)->SetDeclaringClass(new_class); 4421 } 4422 } 4423 } 4424} 4425 4426bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4427 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4428 mirror::Class** new_class) { 4429 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4430 4431 if (!LinkSuperClass(klass)) { 4432 return false; 4433 } 4434 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4435 self, Runtime::Current()->GetImtUnimplementedMethod()); 4436 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4437 return false; 4438 } 4439 if (!LinkInstanceFields(self, klass)) { 4440 return false; 4441 } 4442 size_t class_size; 4443 if (!LinkStaticFields(self, klass, &class_size)) { 4444 return false; 4445 } 4446 CreateReferenceInstanceOffsets(klass); 4447 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4448 4449 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4450 // We don't need to retire this class as it has no embedded tables or it was created the 4451 // correct size during class linker initialization. 4452 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4453 4454 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4455 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4456 } 4457 4458 // This will notify waiters on klass that saw the not yet resolved 4459 // class in the class_table_ during EnsureResolved. 4460 klass->SetStatus(mirror::Class::kStatusResolved, self); 4461 *new_class = klass.Get(); 4462 } else { 4463 CHECK(!klass->IsResolved()); 4464 // Retire the temporary class and create the correctly sized resolved class. 4465 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4466 if (UNLIKELY(*new_class == nullptr)) { 4467 CHECK(self->IsExceptionPending()); // Expect an OOME. 4468 klass->SetStatus(mirror::Class::kStatusError, self); 4469 return false; 4470 } 4471 4472 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4473 StackHandleScope<1> hs(self); 4474 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4475 ObjectLock<mirror::Class> lock(self, new_class_h); 4476 4477 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4478 4479 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 4480 ComputeModifiedUtf8Hash(descriptor)); 4481 CHECK(existing == nullptr || existing == klass.Get()); 4482 4483 // This will notify waiters on temp class that saw the not yet resolved class in the 4484 // class_table_ during EnsureResolved. 4485 klass->SetStatus(mirror::Class::kStatusRetired, self); 4486 4487 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4488 // This will notify waiters on new_class that saw the not yet resolved 4489 // class in the class_table_ during EnsureResolved. 4490 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4491 } 4492 return true; 4493} 4494 4495bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4496 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4497 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4498 uint16_t super_class_idx = class_def.superclass_idx_; 4499 if (super_class_idx != DexFile::kDexNoIndex16) { 4500 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4501 if (super_class == nullptr) { 4502 DCHECK(Thread::Current()->IsExceptionPending()); 4503 return false; 4504 } 4505 // Verify 4506 if (!klass->CanAccess(super_class)) { 4507 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4508 PrettyDescriptor(super_class).c_str(), 4509 PrettyDescriptor(klass.Get()).c_str()); 4510 return false; 4511 } 4512 CHECK(super_class->IsResolved()); 4513 klass->SetSuperClass(super_class); 4514 } 4515 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4516 if (interfaces != nullptr) { 4517 for (size_t i = 0; i < interfaces->Size(); i++) { 4518 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4519 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4520 if (interface == nullptr) { 4521 DCHECK(Thread::Current()->IsExceptionPending()); 4522 return false; 4523 } 4524 // Verify 4525 if (!klass->CanAccess(interface)) { 4526 // TODO: the RI seemed to ignore this in my testing. 4527 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4528 PrettyDescriptor(interface).c_str(), 4529 PrettyDescriptor(klass.Get()).c_str()); 4530 return false; 4531 } 4532 } 4533 } 4534 // Mark the class as loaded. 4535 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4536 return true; 4537} 4538 4539bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4540 CHECK(!klass->IsPrimitive()); 4541 mirror::Class* super = klass->GetSuperClass(); 4542 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4543 if (super != nullptr) { 4544 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4545 return false; 4546 } 4547 return true; 4548 } 4549 if (super == nullptr) { 4550 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4551 PrettyDescriptor(klass.Get()).c_str()); 4552 return false; 4553 } 4554 // Verify 4555 if (super->IsFinal() || super->IsInterface()) { 4556 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4557 PrettyDescriptor(super).c_str(), 4558 PrettyDescriptor(klass.Get()).c_str(), 4559 super->IsFinal() ? "declared final" : "an interface"); 4560 return false; 4561 } 4562 if (!klass->CanAccess(super)) { 4563 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4564 PrettyDescriptor(super).c_str(), 4565 PrettyDescriptor(klass.Get()).c_str()); 4566 return false; 4567 } 4568 4569 // Inherit kAccClassIsFinalizable from the superclass in case this 4570 // class doesn't override finalize. 4571 if (super->IsFinalizable()) { 4572 klass->SetFinalizable(); 4573 } 4574 4575 // Inherit reference flags (if any) from the superclass. 4576 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4577 if (reference_flags != 0) { 4578 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4579 } 4580 // Disallow custom direct subclasses of java.lang.ref.Reference. 4581 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4582 ThrowLinkageError(klass.Get(), 4583 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4584 PrettyDescriptor(klass.Get()).c_str()); 4585 return false; 4586 } 4587 4588 if (kIsDebugBuild) { 4589 // Ensure super classes are fully resolved prior to resolving fields.. 4590 while (super != nullptr) { 4591 CHECK(super->IsResolved()); 4592 super = super->GetSuperClass(); 4593 } 4594 } 4595 return true; 4596} 4597 4598// Populate the class vtable and itable. Compute return type indices. 4599bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4600 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4601 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4602 self->AllowThreadSuspension(); 4603 if (klass->IsInterface()) { 4604 // No vtable. 4605 size_t count = klass->NumVirtualMethods(); 4606 if (!IsUint(16, count)) { 4607 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4608 return false; 4609 } 4610 for (size_t i = 0; i < count; ++i) { 4611 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4612 } 4613 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4614 return false; 4615 } 4616 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4617} 4618 4619// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4620// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4621// caches in the implementation below. 4622class MethodNameAndSignatureComparator FINAL : public ValueObject { 4623 public: 4624 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4625 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4626 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4627 name_(nullptr), name_len_(0) { 4628 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4629 } 4630 4631 const char* GetName() { 4632 if (name_ == nullptr) { 4633 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4634 } 4635 return name_; 4636 } 4637 4638 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4639 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4640 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4641 const DexFile* other_dex_file = other->GetDexFile(); 4642 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4643 if (dex_file_ == other_dex_file) { 4644 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4645 } 4646 GetName(); // Only used to make sure its calculated. 4647 uint32_t other_name_len; 4648 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4649 &other_name_len); 4650 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4651 return false; 4652 } 4653 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4654 } 4655 4656 private: 4657 // Dex file for the method to compare against. 4658 const DexFile* const dex_file_; 4659 // MethodId for the method to compare against. 4660 const DexFile::MethodId* const mid_; 4661 // Lazily computed name from the dex file's strings. 4662 const char* name_; 4663 // Lazily computed name length. 4664 uint32_t name_len_; 4665}; 4666 4667class LinkVirtualHashTable { 4668 public: 4669 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4670 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4671 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4672 } 4673 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4674 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4675 const char* name = local_method->GetName(); 4676 uint32_t hash = ComputeModifiedUtf8Hash(name); 4677 uint32_t index = hash % hash_size_; 4678 // Linear probe until we have an empty slot. 4679 while (hash_table_[index] != invalid_index_) { 4680 if (++index == hash_size_) { 4681 index = 0; 4682 } 4683 } 4684 hash_table_[index] = virtual_method_index; 4685 } 4686 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4687 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4688 const char* name = comparator->GetName(); 4689 uint32_t hash = ComputeModifiedUtf8Hash(name); 4690 size_t index = hash % hash_size_; 4691 while (true) { 4692 const uint32_t value = hash_table_[index]; 4693 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4694 // the block and can safely assume not found. 4695 if (value == invalid_index_) { 4696 break; 4697 } 4698 if (value != removed_index_) { // This signifies not already overriden. 4699 mirror::ArtMethod* virtual_method = 4700 klass_->GetVirtualMethodDuringLinking(value); 4701 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4702 hash_table_[index] = removed_index_; 4703 return value; 4704 } 4705 } 4706 if (++index == hash_size_) { 4707 index = 0; 4708 } 4709 } 4710 return GetNotFoundIndex(); 4711 } 4712 static uint32_t GetNotFoundIndex() { 4713 return invalid_index_; 4714 } 4715 4716 private: 4717 static const uint32_t invalid_index_; 4718 static const uint32_t removed_index_; 4719 4720 Handle<mirror::Class> klass_; 4721 const size_t hash_size_; 4722 uint32_t* const hash_table_; 4723}; 4724 4725const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4726const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4727 4728bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4729 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4730 if (klass->HasSuperClass()) { 4731 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4732 const size_t max_count = num_virtual_methods + super_vtable_length; 4733 StackHandleScope<2> hs(self); 4734 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4735 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4736 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4737 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4738 if (UNLIKELY(vtable.Get() == nullptr)) { 4739 CHECK(self->IsExceptionPending()); // OOME. 4740 return false; 4741 } 4742 for (size_t i = 0; i < super_vtable_length; i++) { 4743 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4744 } 4745 if (num_virtual_methods == 0) { 4746 klass->SetVTable(vtable.Get()); 4747 return true; 4748 } 4749 } else { 4750 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4751 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4752 if (num_virtual_methods == 0) { 4753 klass->SetVTable(super_vtable); 4754 return true; 4755 } 4756 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4757 if (UNLIKELY(vtable.Get() == nullptr)) { 4758 CHECK(self->IsExceptionPending()); // OOME. 4759 return false; 4760 } 4761 } 4762 // How the algorithm works: 4763 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4764 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4765 // method which has not been matched to a vtable method, and j if the virtual method at the 4766 // index overrode the super virtual method at index j. 4767 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4768 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4769 // the need for the initial vtable which we later shrink back down). 4770 // 3. Add non overridden methods to the end of the vtable. 4771 static constexpr size_t kMaxStackHash = 250; 4772 const size_t hash_table_size = num_virtual_methods * 3; 4773 uint32_t* hash_table_ptr; 4774 std::unique_ptr<uint32_t[]> hash_heap_storage; 4775 if (hash_table_size <= kMaxStackHash) { 4776 hash_table_ptr = reinterpret_cast<uint32_t*>( 4777 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4778 } else { 4779 hash_heap_storage.reset(new uint32_t[hash_table_size]); 4780 hash_table_ptr = hash_heap_storage.get(); 4781 } 4782 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 4783 // Add virtual methods to the hash table. 4784 for (size_t i = 0; i < num_virtual_methods; ++i) { 4785 hash_table.Add(i); 4786 } 4787 // Loop through each super vtable method and see if they are overriden by a method we added to 4788 // the hash table. 4789 for (size_t j = 0; j < super_vtable_length; ++j) { 4790 // Search the hash table to see if we are overidden by any method. 4791 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4792 MethodNameAndSignatureComparator super_method_name_comparator( 4793 super_method->GetInterfaceMethodIfProxy()); 4794 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 4795 if (hash_index != hash_table.GetNotFoundIndex()) { 4796 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 4797 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4798 super_method->GetAccessFlags())) { 4799 if (super_method->IsFinal()) { 4800 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4801 PrettyMethod(virtual_method).c_str(), 4802 super_method->GetDeclaringClassDescriptor()); 4803 return false; 4804 } 4805 vtable->SetWithoutChecks<false>(j, virtual_method); 4806 virtual_method->SetMethodIndex(j); 4807 } else { 4808 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 4809 << " would have incorrectly overridden the package-private method in " 4810 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4811 } 4812 } 4813 } 4814 // Add the non overridden methods at the end. 4815 size_t actual_count = super_vtable_length; 4816 for (size_t i = 0; i < num_virtual_methods; ++i) { 4817 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4818 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 4819 if (method_idx < super_vtable_length && 4820 local_method == vtable->GetWithoutChecks(method_idx)) { 4821 continue; 4822 } 4823 vtable->SetWithoutChecks<false>(actual_count, local_method); 4824 local_method->SetMethodIndex(actual_count); 4825 ++actual_count; 4826 } 4827 if (!IsUint(16, actual_count)) { 4828 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4829 return false; 4830 } 4831 // Shrink vtable if possible 4832 CHECK_LE(actual_count, max_count); 4833 if (actual_count < max_count) { 4834 vtable.Assign(vtable->CopyOf(self, actual_count)); 4835 if (UNLIKELY(vtable.Get() == nullptr)) { 4836 CHECK(self->IsExceptionPending()); // OOME. 4837 return false; 4838 } 4839 } 4840 klass->SetVTable(vtable.Get()); 4841 } else { 4842 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4843 if (!IsUint(16, num_virtual_methods)) { 4844 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 4845 static_cast<int>(num_virtual_methods)); 4846 return false; 4847 } 4848 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 4849 if (UNLIKELY(vtable == nullptr)) { 4850 CHECK(self->IsExceptionPending()); // OOME. 4851 return false; 4852 } 4853 for (size_t i = 0; i < num_virtual_methods; ++i) { 4854 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4855 vtable->SetWithoutChecks<false>(i, virtual_method); 4856 virtual_method->SetMethodIndex(i & 0xFFFF); 4857 } 4858 klass->SetVTable(vtable); 4859 } 4860 return true; 4861} 4862 4863bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 4864 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4865 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4866 StackHandleScope<3> hs(self); 4867 Runtime* const runtime = Runtime::Current(); 4868 const bool has_superclass = klass->HasSuperClass(); 4869 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 4870 const bool have_interfaces = interfaces.Get() != nullptr; 4871 const size_t num_interfaces = 4872 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 4873 if (num_interfaces == 0) { 4874 if (super_ifcount == 0) { 4875 // Class implements no interfaces. 4876 DCHECK_EQ(klass->GetIfTableCount(), 0); 4877 DCHECK(klass->GetIfTable() == nullptr); 4878 return true; 4879 } 4880 // Class implements same interfaces as parent, are any of these not marker interfaces? 4881 bool has_non_marker_interface = false; 4882 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4883 for (size_t i = 0; i < super_ifcount; ++i) { 4884 if (super_iftable->GetMethodArrayCount(i) > 0) { 4885 has_non_marker_interface = true; 4886 break; 4887 } 4888 } 4889 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4890 if (!has_non_marker_interface) { 4891 klass->SetIfTable(super_iftable); 4892 return true; 4893 } 4894 } 4895 size_t ifcount = super_ifcount + num_interfaces; 4896 for (size_t i = 0; i < num_interfaces; i++) { 4897 mirror::Class* interface = have_interfaces ? 4898 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 4899 DCHECK(interface != nullptr); 4900 if (UNLIKELY(!interface->IsInterface())) { 4901 std::string temp; 4902 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4903 PrettyDescriptor(klass.Get()).c_str(), 4904 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4905 return false; 4906 } 4907 ifcount += interface->GetIfTableCount(); 4908 } 4909 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4910 if (UNLIKELY(iftable.Get() == nullptr)) { 4911 CHECK(self->IsExceptionPending()); // OOME. 4912 return false; 4913 } 4914 if (super_ifcount != 0) { 4915 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4916 for (size_t i = 0; i < super_ifcount; i++) { 4917 mirror::Class* super_interface = super_iftable->GetInterface(i); 4918 iftable->SetInterface(i, super_interface); 4919 } 4920 } 4921 self->AllowThreadSuspension(); 4922 // Flatten the interface inheritance hierarchy. 4923 size_t idx = super_ifcount; 4924 for (size_t i = 0; i < num_interfaces; i++) { 4925 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 4926 mirror::Class::GetDirectInterface(self, klass, i); 4927 // Check if interface is already in iftable 4928 bool duplicate = false; 4929 for (size_t j = 0; j < idx; j++) { 4930 mirror::Class* existing_interface = iftable->GetInterface(j); 4931 if (existing_interface == interface) { 4932 duplicate = true; 4933 break; 4934 } 4935 } 4936 if (!duplicate) { 4937 // Add this non-duplicate interface. 4938 iftable->SetInterface(idx++, interface); 4939 // Add this interface's non-duplicate super-interfaces. 4940 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4941 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4942 bool super_duplicate = false; 4943 for (size_t k = 0; k < idx; k++) { 4944 mirror::Class* existing_interface = iftable->GetInterface(k); 4945 if (existing_interface == super_interface) { 4946 super_duplicate = true; 4947 break; 4948 } 4949 } 4950 if (!super_duplicate) { 4951 iftable->SetInterface(idx++, super_interface); 4952 } 4953 } 4954 } 4955 } 4956 self->AllowThreadSuspension(); 4957 // Shrink iftable in case duplicates were found 4958 if (idx < ifcount) { 4959 DCHECK_NE(num_interfaces, 0U); 4960 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4961 if (UNLIKELY(iftable.Get() == nullptr)) { 4962 CHECK(self->IsExceptionPending()); // OOME. 4963 return false; 4964 } 4965 ifcount = idx; 4966 } else { 4967 DCHECK_EQ(idx, ifcount); 4968 } 4969 klass->SetIfTable(iftable.Get()); 4970 // If we're an interface, we don't need the vtable pointers, so we're done. 4971 if (klass->IsInterface()) { 4972 return true; 4973 } 4974 size_t miranda_list_size = 0; 4975 size_t max_miranda_methods = 0; // The max size of miranda_list. 4976 for (size_t i = 0; i < ifcount; ++i) { 4977 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4978 } 4979 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 4980 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4981 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4982 hs.NewHandle(klass->GetVTableDuringLinking())); 4983 // Copy the IMT from the super class if possible. 4984 bool extend_super_iftable = false; 4985 if (has_superclass) { 4986 mirror::Class* super_class = klass->GetSuperClass(); 4987 extend_super_iftable = true; 4988 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4989 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 4990 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 4991 } 4992 } else { 4993 // No imt in the super class, need to reconstruct from the iftable. 4994 mirror::IfTable* if_table = super_class->GetIfTable(); 4995 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4996 const size_t length = super_class->GetIfTableCount(); 4997 for (size_t i = 0; i < length; ++i) { 4998 mirror::Class* interface = iftable->GetInterface(i); 4999 const size_t num_virtuals = interface->NumVirtualMethods(); 5000 const size_t method_array_count = if_table->GetMethodArrayCount(i); 5001 DCHECK_EQ(num_virtuals, method_array_count); 5002 if (method_array_count == 0) { 5003 continue; 5004 } 5005 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 5006 for (size_t j = 0; j < num_virtuals; ++j) { 5007 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 5008 if (method->IsMiranda()) { 5009 continue; 5010 } 5011 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 5012 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5013 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5014 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5015 out_imt->SetReference(imt_index, method); 5016 } else if (imt_ref != conflict_method) { 5017 out_imt->SetReference(imt_index, conflict_method); 5018 } 5019 } 5020 } 5021 } 5022 } 5023 for (size_t i = 0; i < ifcount; ++i) { 5024 self->AllowThreadSuspension(); 5025 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 5026 if (num_methods > 0) { 5027 StackHandleScope<2> hs2(self); 5028 const bool is_super = i < super_ifcount; 5029 const bool super_interface = is_super && extend_super_iftable; 5030 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 5031 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 5032 if (super_interface) { 5033 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 5034 DCHECK(if_table != nullptr); 5035 DCHECK(if_table->GetMethodArray(i) != nullptr); 5036 // If we are working on a super interface, try extending the existing method array. 5037 method_array = hs2.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 5038 AsObjectArray<mirror::ArtMethod>()); 5039 // We are overwriting a super class interface, try to only virtual methods instead of the 5040 // whole vtable. 5041 input_array = hs2.NewHandle(klass->GetVirtualMethods()); 5042 } else { 5043 method_array = hs2.NewHandle(AllocArtMethodArray(self, num_methods)); 5044 // A new interface, we need the whole vtable incase a new interface method is implemented 5045 // in the whole superclass. 5046 input_array = vtable; 5047 } 5048 if (UNLIKELY(method_array.Get() == nullptr)) { 5049 CHECK(self->IsExceptionPending()); // OOME. 5050 return false; 5051 } 5052 iftable->SetMethodArray(i, method_array.Get()); 5053 if (input_array.Get() == nullptr) { 5054 // If the added virtual methods is empty, do nothing. 5055 DCHECK(super_interface); 5056 continue; 5057 } 5058 for (size_t j = 0; j < num_methods; ++j) { 5059 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 5060 MethodNameAndSignatureComparator interface_name_comparator( 5061 interface_method->GetInterfaceMethodIfProxy()); 5062 int32_t k; 5063 // For each method listed in the interface's method list, find the 5064 // matching method in our class's method list. We want to favor the 5065 // subclass over the superclass, which just requires walking 5066 // back from the end of the vtable. (This only matters if the 5067 // superclass defines a private method and this class redefines 5068 // it -- otherwise it would use the same vtable slot. In .dex files 5069 // those don't end up in the virtual method table, so it shouldn't 5070 // matter which direction we go. We walk it backward anyway.) 5071 for (k = input_array->GetLength() - 1; k >= 0; --k) { 5072 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 5073 mirror::ArtMethod* vtable_method_for_name_comparison = 5074 vtable_method->GetInterfaceMethodIfProxy(); 5075 if (interface_name_comparator.HasSameNameAndSignature( 5076 vtable_method_for_name_comparison)) { 5077 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 5078 ThrowIllegalAccessError( 5079 klass.Get(), 5080 "Method '%s' implementing interface method '%s' is not public", 5081 PrettyMethod(vtable_method).c_str(), 5082 PrettyMethod(interface_method).c_str()); 5083 return false; 5084 } 5085 method_array->SetWithoutChecks<false>(j, vtable_method); 5086 // Place method in imt if entry is empty, place conflict otherwise. 5087 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5088 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5089 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5090 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5091 out_imt->SetReference(imt_index, vtable_method); 5092 } else if (imt_ref != conflict_method) { 5093 // If we are not a conflict and we have the same signature and name as the imt entry, 5094 // it must be that we overwrote a superclass vtable entry. 5095 MethodNameAndSignatureComparator imt_ref_name_comparator( 5096 imt_ref->GetInterfaceMethodIfProxy()); 5097 if (imt_ref_name_comparator.HasSameNameAndSignature( 5098 vtable_method_for_name_comparison)) { 5099 out_imt->SetReference(imt_index, vtable_method); 5100 } else { 5101 out_imt->SetReference(imt_index, conflict_method); 5102 } 5103 } 5104 break; 5105 } 5106 } 5107 if (k < 0 && !super_interface) { 5108 mirror::ArtMethod* miranda_method = nullptr; 5109 for (size_t l = 0; l < miranda_list_size; ++l) { 5110 mirror::ArtMethod* mir_method = miranda_list->Get(l); 5111 if (interface_name_comparator.HasSameNameAndSignature(mir_method)) { 5112 miranda_method = mir_method; 5113 break; 5114 } 5115 } 5116 if (miranda_method == nullptr) { 5117 // Point the interface table at a phantom slot. 5118 miranda_method = interface_method->Clone(self)->AsArtMethod(); 5119 if (UNLIKELY(miranda_method == nullptr)) { 5120 CHECK(self->IsExceptionPending()); // OOME. 5121 return false; 5122 } 5123 DCHECK_LT(miranda_list_size, max_miranda_methods); 5124 miranda_list->Set<false>(miranda_list_size++, miranda_method); 5125 } 5126 method_array->SetWithoutChecks<false>(j, miranda_method); 5127 } 5128 } 5129 } 5130 } 5131 if (miranda_list_size > 0) { 5132 int old_method_count = klass->NumVirtualMethods(); 5133 int new_method_count = old_method_count + miranda_list_size; 5134 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 5135 if (old_method_count == 0) { 5136 virtuals = AllocArtMethodArray(self, new_method_count); 5137 } else { 5138 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 5139 } 5140 if (UNLIKELY(virtuals == nullptr)) { 5141 CHECK(self->IsExceptionPending()); // OOME. 5142 return false; 5143 } 5144 klass->SetVirtualMethods(virtuals); 5145 5146 int old_vtable_count = vtable->GetLength(); 5147 int new_vtable_count = old_vtable_count + miranda_list_size; 5148 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 5149 if (UNLIKELY(vtable.Get() == nullptr)) { 5150 CHECK(self->IsExceptionPending()); // OOME. 5151 return false; 5152 } 5153 for (size_t i = 0; i < miranda_list_size; ++i) { 5154 mirror::ArtMethod* method = miranda_list->Get(i); 5155 // Leave the declaring class alone as type indices are relative to it 5156 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5157 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5158 klass->SetVirtualMethod(old_method_count + i, method); 5159 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5160 } 5161 // TODO: do not assign to the vtable field until it is fully constructed. 5162 klass->SetVTable(vtable.Get()); 5163 } 5164 5165 if (kIsDebugBuild) { 5166 mirror::ObjectArray<mirror::ArtMethod>* check_vtable = klass->GetVTableDuringLinking(); 5167 for (int i = 0; i < check_vtable->GetLength(); ++i) { 5168 CHECK(check_vtable->GetWithoutChecks(i) != nullptr); 5169 } 5170 } 5171 5172 self->AllowThreadSuspension(); 5173 return true; 5174} 5175 5176bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5177 CHECK(klass.Get() != nullptr); 5178 return LinkFields(self, klass, false, nullptr); 5179} 5180 5181bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5182 CHECK(klass.Get() != nullptr); 5183 return LinkFields(self, klass, true, class_size); 5184} 5185 5186struct LinkFieldsComparator { 5187 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5188 } 5189 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5190 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5191 NO_THREAD_SAFETY_ANALYSIS { 5192 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5193 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5194 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5195 if (type1 != type2) { 5196 if (type1 == Primitive::kPrimNot) { 5197 // Reference always goes first. 5198 return true; 5199 } 5200 if (type2 == Primitive::kPrimNot) { 5201 // Reference always goes first. 5202 return false; 5203 } 5204 size_t size1 = Primitive::ComponentSize(type1); 5205 size_t size2 = Primitive::ComponentSize(type2); 5206 if (size1 != size2) { 5207 // Larger primitive types go first. 5208 return size1 > size2; 5209 } 5210 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 5211 return type1 < type2; 5212 } 5213 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 5214 // by name and for equal names by type id index. 5215 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 5216 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 5217 } 5218}; 5219 5220bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5221 size_t* class_size) { 5222 self->AllowThreadSuspension(); 5223 size_t num_fields = 5224 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5225 5226 mirror::ObjectArray<mirror::ArtField>* fields = 5227 is_static ? klass->GetSFields() : klass->GetIFields(); 5228 5229 // Initialize field_offset 5230 MemberOffset field_offset(0); 5231 if (is_static) { 5232 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 5233 } else { 5234 mirror::Class* super_class = klass->GetSuperClass(); 5235 if (super_class != nullptr) { 5236 CHECK(super_class->IsResolved()) 5237 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5238 field_offset = MemberOffset(super_class->GetObjectSize()); 5239 } 5240 } 5241 5242 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5243 5244 // we want a relatively stable order so that adding new fields 5245 // minimizes disruption of C++ version such as Class and Method. 5246 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5247 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5248 "Naked ArtField references in deque"); 5249 for (size_t i = 0; i < num_fields; i++) { 5250 mirror::ArtField* f = fields->Get(i); 5251 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5252 grouped_and_sorted_fields.push_back(f); 5253 } 5254 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5255 LinkFieldsComparator()); 5256 5257 // References should be at the front. 5258 size_t current_field = 0; 5259 size_t num_reference_fields = 0; 5260 FieldGaps gaps; 5261 5262 for (; current_field < num_fields; current_field++) { 5263 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5264 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5265 bool isPrimitive = type != Primitive::kPrimNot; 5266 if (isPrimitive) { 5267 break; // past last reference, move on to the next phase 5268 } 5269 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>( 5270 field_offset.Uint32Value()))) { 5271 MemberOffset old_offset = field_offset; 5272 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5273 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5274 } 5275 DCHECK(IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(field_offset.Uint32Value())); 5276 grouped_and_sorted_fields.pop_front(); 5277 num_reference_fields++; 5278 field->SetOffset(field_offset); 5279 field_offset = MemberOffset(field_offset.Uint32Value() + 5280 sizeof(mirror::HeapReference<mirror::Object>)); 5281 } 5282 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5283 // otherwise we could end up with suboptimal gap fills. 5284 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5285 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5286 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5287 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5288 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5289 " fields."; 5290 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5291 5292 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5293 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5294 // We know there are no non-reference fields in the Reference classes, and we know 5295 // that 'referent' is alphabetically last, so this is easy... 5296 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5297 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5298 --num_reference_fields; 5299 } 5300 5301 size_t size = field_offset.Uint32Value(); 5302 // Update klass 5303 if (is_static) { 5304 klass->SetNumReferenceStaticFields(num_reference_fields); 5305 *class_size = size; 5306 } else { 5307 klass->SetNumReferenceInstanceFields(num_reference_fields); 5308 if (!klass->IsVariableSize()) { 5309 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 5310 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 5311 } else { 5312 std::string temp; 5313 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5314 size_t previous_size = klass->GetObjectSize(); 5315 if (previous_size != 0) { 5316 // Make sure that we didn't originally have an incorrect size. 5317 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5318 } 5319 klass->SetObjectSize(size); 5320 } 5321 } 5322 } 5323 5324 if (kIsDebugBuild) { 5325 // Make sure that the fields array is ordered by name but all reference 5326 // offsets are at the beginning as far as alignment allows. 5327 MemberOffset start_ref_offset = is_static 5328 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 5329 : klass->GetFirstReferenceInstanceFieldOffset(); 5330 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 5331 num_reference_fields * 5332 sizeof(mirror::HeapReference<mirror::Object>)); 5333 MemberOffset current_ref_offset = start_ref_offset; 5334 for (size_t i = 0; i < num_fields; i++) { 5335 mirror::ArtField* field = fields->Get(i); 5336 if ((false)) { // enable to debug field layout 5337 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5338 << " class=" << PrettyClass(klass.Get()) 5339 << " field=" << PrettyField(field) 5340 << " offset=" 5341 << field->GetField32(mirror::ArtField::OffsetOffset()); 5342 } 5343 if (i != 0) { 5344 mirror::ArtField* prev_field = fields->Get(i - 1u); 5345 // NOTE: The field names can be the same. This is not possible in the Java language 5346 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 5347 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 5348 } 5349 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5350 bool is_primitive = type != Primitive::kPrimNot; 5351 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5352 strcmp("referent", field->GetName()) == 0) { 5353 is_primitive = true; // We lied above, so we have to expect a lie here. 5354 } 5355 MemberOffset offset = field->GetOffsetDuringLinking(); 5356 if (is_primitive) { 5357 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 5358 // Shuffled before references. 5359 size_t type_size = Primitive::ComponentSize(type); 5360 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 5361 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 5362 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 5363 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 5364 } 5365 } else { 5366 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 5367 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 5368 sizeof(mirror::HeapReference<mirror::Object>)); 5369 } 5370 } 5371 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 5372 } 5373 return true; 5374} 5375 5376// Set the bitmap of reference instance field offsets. 5377void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5378 uint32_t reference_offsets = 0; 5379 mirror::Class* super_class = klass->GetSuperClass(); 5380 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5381 if (super_class != nullptr) { 5382 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5383 // Compute reference offsets unless our superclass overflowed. 5384 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5385 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5386 if (num_reference_fields != 0u) { 5387 // All of the fields that contain object references are guaranteed be grouped in memory 5388 // starting at an appropriately aligned address after super class object data. 5389 uint32_t start_offset = RoundUp(super_class->GetObjectSize(), 5390 sizeof(mirror::HeapReference<mirror::Object>)); 5391 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) / 5392 sizeof(mirror::HeapReference<mirror::Object>); 5393 if (start_bit + num_reference_fields > 32) { 5394 reference_offsets = mirror::Class::kClassWalkSuper; 5395 } else { 5396 reference_offsets |= (0xffffffffu << start_bit) & 5397 (0xffffffffu >> (32 - (start_bit + num_reference_fields))); 5398 } 5399 } 5400 } 5401 } 5402 klass->SetReferenceInstanceOffsets(reference_offsets); 5403} 5404 5405mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5406 Handle<mirror::DexCache> dex_cache) { 5407 DCHECK(dex_cache.Get() != nullptr); 5408 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5409 if (resolved != nullptr) { 5410 return resolved; 5411 } 5412 uint32_t utf16_length; 5413 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5414 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5415 dex_cache->SetResolvedString(string_idx, string); 5416 return string; 5417} 5418 5419mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5420 mirror::Class* referrer) { 5421 StackHandleScope<2> hs(Thread::Current()); 5422 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5423 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5424 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5425} 5426 5427mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5428 Handle<mirror::DexCache> dex_cache, 5429 Handle<mirror::ClassLoader> class_loader) { 5430 DCHECK(dex_cache.Get() != nullptr); 5431 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5432 if (resolved == nullptr) { 5433 Thread* self = Thread::Current(); 5434 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5435 resolved = FindClass(self, descriptor, class_loader); 5436 if (resolved != nullptr) { 5437 // TODO: we used to throw here if resolved's class loader was not the 5438 // boot class loader. This was to permit different classes with the 5439 // same name to be loaded simultaneously by different loaders 5440 dex_cache->SetResolvedType(type_idx, resolved); 5441 } else { 5442 CHECK(self->IsExceptionPending()) 5443 << "Expected pending exception for failed resolution of: " << descriptor; 5444 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5445 StackHandleScope<1> hs(self); 5446 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5447 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5448 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5449 self->ClearException(); 5450 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5451 self->GetException(nullptr)->SetCause(cause.Get()); 5452 } 5453 } 5454 } 5455 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5456 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5457 return resolved; 5458} 5459 5460mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5461 Handle<mirror::DexCache> dex_cache, 5462 Handle<mirror::ClassLoader> class_loader, 5463 Handle<mirror::ArtMethod> referrer, 5464 InvokeType type) { 5465 DCHECK(dex_cache.Get() != nullptr); 5466 // Check for hit in the dex cache. 5467 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5468 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5469 return resolved; 5470 } 5471 // Fail, get the declaring class. 5472 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5473 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5474 if (klass == nullptr) { 5475 DCHECK(Thread::Current()->IsExceptionPending()); 5476 return nullptr; 5477 } 5478 // Scan using method_idx, this saves string compares but will only hit for matching dex 5479 // caches/files. 5480 switch (type) { 5481 case kDirect: // Fall-through. 5482 case kStatic: 5483 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5484 break; 5485 case kInterface: 5486 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5487 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5488 break; 5489 case kSuper: // Fall-through. 5490 case kVirtual: 5491 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5492 break; 5493 default: 5494 LOG(FATAL) << "Unreachable - invocation type: " << type; 5495 UNREACHABLE(); 5496 } 5497 if (resolved == nullptr) { 5498 // Search by name, which works across dex files. 5499 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5500 const Signature signature = dex_file.GetMethodSignature(method_id); 5501 switch (type) { 5502 case kDirect: // Fall-through. 5503 case kStatic: 5504 resolved = klass->FindDirectMethod(name, signature); 5505 break; 5506 case kInterface: 5507 resolved = klass->FindInterfaceMethod(name, signature); 5508 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5509 break; 5510 case kSuper: // Fall-through. 5511 case kVirtual: 5512 resolved = klass->FindVirtualMethod(name, signature); 5513 break; 5514 } 5515 } 5516 // If we found a method, check for incompatible class changes. 5517 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5518 // Be a good citizen and update the dex cache to speed subsequent calls. 5519 dex_cache->SetResolvedMethod(method_idx, resolved); 5520 return resolved; 5521 } else { 5522 // If we had a method, it's an incompatible-class-change error. 5523 if (resolved != nullptr) { 5524 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5525 } else { 5526 // We failed to find the method which means either an access error, an incompatible class 5527 // change, or no such method. First try to find the method among direct and virtual methods. 5528 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5529 const Signature signature = dex_file.GetMethodSignature(method_id); 5530 switch (type) { 5531 case kDirect: 5532 case kStatic: 5533 resolved = klass->FindVirtualMethod(name, signature); 5534 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5535 // have had a resolved method before, which triggers the "true" branch above. 5536 break; 5537 case kInterface: 5538 case kVirtual: 5539 case kSuper: 5540 resolved = klass->FindDirectMethod(name, signature); 5541 break; 5542 } 5543 5544 // If we found something, check that it can be accessed by the referrer. 5545 bool exception_generated = false; 5546 if (resolved != nullptr && referrer.Get() != nullptr) { 5547 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5548 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5549 if (!referring_class->CanAccess(methods_class)) { 5550 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5551 resolved, type); 5552 exception_generated = true; 5553 } else if (!referring_class->CanAccessMember(methods_class, 5554 resolved->GetAccessFlags())) { 5555 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5556 exception_generated = true; 5557 } 5558 } 5559 if (!exception_generated) { 5560 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check 5561 // interface methods and throw if we find the method there. If we find nothing, throw a 5562 // NoSuchMethodError. 5563 switch (type) { 5564 case kDirect: 5565 case kStatic: 5566 if (resolved != nullptr) { 5567 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5568 } else { 5569 resolved = klass->FindInterfaceMethod(name, signature); 5570 if (resolved != nullptr) { 5571 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5572 } else { 5573 ThrowNoSuchMethodError(type, klass, name, signature); 5574 } 5575 } 5576 break; 5577 case kInterface: 5578 if (resolved != nullptr) { 5579 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5580 } else { 5581 resolved = klass->FindVirtualMethod(name, signature); 5582 if (resolved != nullptr) { 5583 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5584 } else { 5585 ThrowNoSuchMethodError(type, klass, name, signature); 5586 } 5587 } 5588 break; 5589 case kSuper: 5590 if (resolved != nullptr) { 5591 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5592 } else { 5593 ThrowNoSuchMethodError(type, klass, name, signature); 5594 } 5595 break; 5596 case kVirtual: 5597 if (resolved != nullptr) { 5598 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5599 } else { 5600 resolved = klass->FindInterfaceMethod(name, signature); 5601 if (resolved != nullptr) { 5602 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5603 } else { 5604 ThrowNoSuchMethodError(type, klass, name, signature); 5605 } 5606 } 5607 break; 5608 } 5609 } 5610 } 5611 Thread::Current()->AssertPendingException(); 5612 return nullptr; 5613 } 5614} 5615 5616mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5617 Handle<mirror::DexCache> dex_cache, 5618 Handle<mirror::ClassLoader> class_loader, 5619 bool is_static) { 5620 DCHECK(dex_cache.Get() != nullptr); 5621 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5622 if (resolved != nullptr) { 5623 return resolved; 5624 } 5625 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5626 Thread* const self = Thread::Current(); 5627 StackHandleScope<1> hs(self); 5628 Handle<mirror::Class> klass( 5629 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5630 if (klass.Get() == nullptr) { 5631 DCHECK(Thread::Current()->IsExceptionPending()); 5632 return nullptr; 5633 } 5634 5635 if (is_static) { 5636 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5637 } else { 5638 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5639 } 5640 5641 if (resolved == nullptr) { 5642 const char* name = dex_file.GetFieldName(field_id); 5643 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5644 if (is_static) { 5645 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5646 } else { 5647 resolved = klass->FindInstanceField(name, type); 5648 } 5649 if (resolved == nullptr) { 5650 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5651 return nullptr; 5652 } 5653 } 5654 dex_cache->SetResolvedField(field_idx, resolved); 5655 return resolved; 5656} 5657 5658mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5659 uint32_t field_idx, 5660 Handle<mirror::DexCache> dex_cache, 5661 Handle<mirror::ClassLoader> class_loader) { 5662 DCHECK(dex_cache.Get() != nullptr); 5663 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5664 if (resolved != nullptr) { 5665 return resolved; 5666 } 5667 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5668 Thread* self = Thread::Current(); 5669 StackHandleScope<1> hs(self); 5670 Handle<mirror::Class> klass( 5671 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5672 if (klass.Get() == nullptr) { 5673 DCHECK(Thread::Current()->IsExceptionPending()); 5674 return nullptr; 5675 } 5676 5677 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5678 StringPiece type(dex_file.StringDataByIdx( 5679 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5680 resolved = mirror::Class::FindField(self, klass, name, type); 5681 if (resolved != nullptr) { 5682 dex_cache->SetResolvedField(field_idx, resolved); 5683 } else { 5684 ThrowNoSuchFieldError("", klass.Get(), type, name); 5685 } 5686 return resolved; 5687} 5688 5689const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5690 uint32_t* length) { 5691 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5692 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5693 const DexFile& dex_file = *dex_cache->GetDexFile(); 5694 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5695 return dex_file.GetMethodShorty(method_id, length); 5696} 5697 5698void ClassLinker::DumpAllClasses(int flags) { 5699 if (dex_cache_image_class_lookup_required_) { 5700 MoveImageClassesToClassTable(); 5701 } 5702 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5703 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5704 std::vector<mirror::Class*> all_classes; 5705 { 5706 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5707 for (GcRoot<mirror::Class>& it : class_table_) { 5708 all_classes.push_back(it.Read()); 5709 } 5710 } 5711 5712 for (size_t i = 0; i < all_classes.size(); ++i) { 5713 all_classes[i]->DumpClass(std::cerr, flags); 5714 } 5715} 5716 5717static OatFile::OatMethod CreateOatMethod(const void* code) { 5718 CHECK(code != nullptr); 5719 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5720 base -= sizeof(void*); // Move backward so that code_offset != 0. 5721 const uint32_t code_offset = sizeof(void*); 5722 return OatFile::OatMethod(base, code_offset); 5723} 5724 5725bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5726 return (entry_point == GetQuickResolutionStub()) || 5727 (quick_resolution_trampoline_ == entry_point); 5728} 5729 5730bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5731 return (entry_point == GetQuickToInterpreterBridge()) || 5732 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5733} 5734 5735bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5736 return (entry_point == GetQuickGenericJniStub()) || 5737 (quick_generic_jni_trampoline_ == entry_point); 5738} 5739 5740const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5741 return GetQuickGenericJniStub(); 5742} 5743 5744void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, 5745 const void* method_code) const { 5746 OatFile::OatMethod oat_method = CreateOatMethod(method_code); 5747 oat_method.LinkMethod(method); 5748 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5749} 5750 5751void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5752 if (!method->IsNative()) { 5753 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5754 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5755 } else { 5756 const void* quick_method_code = GetQuickGenericJniStub(); 5757 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code); 5758 oat_method.LinkMethod(method); 5759 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5760 } 5761} 5762 5763void ClassLinker::DumpForSigQuit(std::ostream& os) { 5764 Thread* self = Thread::Current(); 5765 if (dex_cache_image_class_lookup_required_) { 5766 ScopedObjectAccess soa(self); 5767 MoveImageClassesToClassTable(); 5768 } 5769 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5770 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5771 << class_table_.Size() << "\n"; 5772} 5773 5774size_t ClassLinker::NumLoadedClasses() { 5775 if (dex_cache_image_class_lookup_required_) { 5776 MoveImageClassesToClassTable(); 5777 } 5778 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5779 // Only return non zygote classes since these are the ones which apps which care about. 5780 return class_table_.Size(); 5781} 5782 5783pid_t ClassLinker::GetClassesLockOwner() { 5784 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5785} 5786 5787pid_t ClassLinker::GetDexLockOwner() { 5788 return dex_lock_.GetExclusiveOwnerTid(); 5789} 5790 5791void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5792 DCHECK(!init_done_); 5793 5794 DCHECK(klass != nullptr); 5795 DCHECK(klass->GetClassLoader() == nullptr); 5796 5797 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5798 DCHECK(class_roots != nullptr); 5799 DCHECK(class_roots->Get(class_root) == nullptr); 5800 class_roots->Set<false>(class_root, klass); 5801} 5802 5803const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5804 static const char* class_roots_descriptors[] = { 5805 "Ljava/lang/Class;", 5806 "Ljava/lang/Object;", 5807 "[Ljava/lang/Class;", 5808 "[Ljava/lang/Object;", 5809 "Ljava/lang/String;", 5810 "Ljava/lang/DexCache;", 5811 "Ljava/lang/ref/Reference;", 5812 "Ljava/lang/reflect/ArtField;", 5813 "Ljava/lang/reflect/ArtMethod;", 5814 "Ljava/lang/reflect/Proxy;", 5815 "[Ljava/lang/String;", 5816 "[Ljava/lang/reflect/ArtField;", 5817 "[Ljava/lang/reflect/ArtMethod;", 5818 "Ljava/lang/ClassLoader;", 5819 "Ljava/lang/Throwable;", 5820 "Ljava/lang/ClassNotFoundException;", 5821 "Ljava/lang/StackTraceElement;", 5822 "Z", 5823 "B", 5824 "C", 5825 "D", 5826 "F", 5827 "I", 5828 "J", 5829 "S", 5830 "V", 5831 "[Z", 5832 "[B", 5833 "[C", 5834 "[D", 5835 "[F", 5836 "[I", 5837 "[J", 5838 "[S", 5839 "[Ljava/lang/StackTraceElement;", 5840 }; 5841 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5842 "Mismatch between class descriptors and class-root enum"); 5843 5844 const char* descriptor = class_roots_descriptors[class_root]; 5845 CHECK(descriptor != nullptr); 5846 return descriptor; 5847} 5848 5849std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 5850 const { 5851 std::string temp; 5852 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 5853} 5854 5855bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5856 const GcRoot<mirror::Class>& b) { 5857 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 5858 return false; 5859 } 5860 std::string temp; 5861 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 5862} 5863 5864std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 5865 const std::pair<const char*, mirror::ClassLoader*>& element) const { 5866 return ComputeModifiedUtf8Hash(element.first); 5867} 5868 5869bool ClassLinker::ClassDescriptorHashEquals::operator()( 5870 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) { 5871 if (a.Read()->GetClassLoader() != b.second) { 5872 return false; 5873 } 5874 return a.Read()->DescriptorEquals(b.first); 5875} 5876 5877bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5878 const char* descriptor) { 5879 return a.Read()->DescriptorEquals(descriptor); 5880} 5881 5882std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 5883 return ComputeModifiedUtf8Hash(descriptor); 5884} 5885 5886bool ClassLinker::MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m) { 5887 // Non-image methods don't use direct code pointer. 5888 if (!m->GetDeclaringClass()->IsBootStrapClassLoaded()) { 5889 return false; 5890 } 5891 if (m->IsPrivate()) { 5892 // The method can only be called inside its own oat file. Therefore it won't be called using 5893 // its direct code if the oat file has been compiled in PIC mode. 5894 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 5895 const DexFile& dex_file = m->GetDeclaringClass()->GetDexFile(); 5896 const OatFile::OatDexFile* oat_dex_file = class_linker->FindOpenedOatDexFileForDexFile(dex_file); 5897 if (oat_dex_file == nullptr) { 5898 // No oat file: the method has not been compiled. 5899 return false; 5900 } 5901 const OatFile* oat_file = oat_dex_file->GetOatFile(); 5902 return oat_file != nullptr && !oat_file->IsPic(); 5903 } else { 5904 // The method can be called outside its own oat file. Therefore it won't be called using its 5905 // direct code pointer only if all loaded oat files have been compiled in PIC mode. 5906 ReaderMutexLock mu(Thread::Current(), dex_lock_); 5907 for (const OatFile* oat_file : oat_files_) { 5908 if (!oat_file->IsPic()) { 5909 return true; 5910 } 5911 } 5912 return false; 5913 } 5914} 5915 5916} // namespace art 5917