class_linker.cc revision b5fb207ed5e3570ec14e18811b3fa066168fe493
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 <utility> 25#include <vector> 26 27#include "base/casts.h" 28#include "base/logging.h" 29#include "base/scoped_flock.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "entrypoints/runtime_asm_entrypoints.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "oat.h" 47#include "oat_file.h" 48#include "object_lock.h" 49#include "mirror/art_field-inl.h" 50#include "mirror/art_method-inl.h" 51#include "mirror/class.h" 52#include "mirror/class-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/dex_cache-inl.h" 55#include "mirror/iftable-inl.h" 56#include "mirror/object-inl.h" 57#include "mirror/object_array-inl.h" 58#include "mirror/proxy.h" 59#include "mirror/reference-inl.h" 60#include "mirror/stack_trace_element.h" 61#include "mirror/string-inl.h" 62#include "os.h" 63#include "runtime.h" 64#include "entrypoints/entrypoint_utils.h" 65#include "ScopedLocalRef.h" 66#include "scoped_thread_state_change.h" 67#include "handle_scope-inl.h" 68#include "thread-inl.h" 69#include "utils.h" 70#include "verifier/method_verifier.h" 71#include "well_known_classes.h" 72 73namespace art { 74 75static void ThrowNoClassDefFoundError(const char* fmt, ...) 76 __attribute__((__format__(__printf__, 1, 2))) 77 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 78static void ThrowNoClassDefFoundError(const char* fmt, ...) { 79 va_list args; 80 va_start(args, fmt); 81 Thread* self = Thread::Current(); 82 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 83 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 84 va_end(args); 85} 86 87static void ThrowEarlierClassFailure(mirror::Class* c) 88 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 89 // The class failed to initialize on a previous attempt, so we want to throw 90 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 91 // failed in verification, in which case v2 5.4.1 says we need to re-throw 92 // the previous error. 93 Runtime* runtime = Runtime::Current(); 94 bool is_compiler = runtime->IsCompiler(); 95 if (!is_compiler) { // Give info if this occurs at runtime. 96 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 97 } 98 99 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 100 Thread* self = Thread::Current(); 101 if (is_compiler) { 102 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 103 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 104 self->SetException(ThrowLocation(), pre_allocated); 105 } else { 106 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 107 if (c->GetVerifyErrorClass() != NULL) { 108 // TODO: change the verifier to store an _instance_, with a useful detail message? 109 std::string temp; 110 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 111 PrettyDescriptor(c).c_str()); 112 } else { 113 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 114 PrettyDescriptor(c).c_str()); 115 } 116 } 117} 118 119static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 120 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 121 if (VLOG_IS_ON(class_linker)) { 122 std::string temp; 123 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 124 << klass->GetLocation() << "\n" << Thread::Current()->GetException(nullptr)->Dump(); 125 } 126} 127 128static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 129 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 130 Thread* self = Thread::Current(); 131 JNIEnv* env = self->GetJniEnv(); 132 133 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 134 CHECK(cause.get() != nullptr); 135 136 env->ExceptionClear(); 137 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 138 env->Throw(cause.get()); 139 140 // We only wrap non-Error exceptions; an Error can just be used as-is. 141 if (!is_error) { 142 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 143 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 144 nullptr); 145 } 146 VlogClassInitializationFailure(klass); 147} 148 149// Gap between two fields in object layout. 150struct FieldGap { 151 uint32_t start_offset; // The offset from the start of the object. 152 uint32_t size; // The gap size of 1, 2, or 4 bytes. 153}; 154struct FieldGapsComparator { 155 explicit FieldGapsComparator() { 156 } 157 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 158 NO_THREAD_SAFETY_ANALYSIS { 159 // Sort by gap size, largest first. 160 return lhs.size > rhs.size; 161 } 162}; 163typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 164 165// Adds largest aligned gaps to queue of gaps. 166static void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 167 DCHECK(gaps != nullptr); 168 169 uint32_t current_offset = gap_start; 170 while (current_offset != gap_end) { 171 size_t remaining = gap_end - current_offset; 172 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 173 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 174 current_offset += sizeof(uint32_t); 175 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 176 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 177 current_offset += sizeof(uint16_t); 178 } else { 179 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 180 current_offset += sizeof(uint8_t); 181 } 182 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 183 } 184} 185// Shuffle fields forward, making use of gaps whenever possible. 186template<int n> 187static void ShuffleForward(size_t* current_field_idx, 188 MemberOffset* field_offset, 189 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 190 FieldGaps* gaps) 191 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 192 DCHECK(current_field_idx != nullptr); 193 DCHECK(grouped_and_sorted_fields != nullptr); 194 DCHECK(gaps != nullptr); 195 DCHECK(field_offset != nullptr); 196 197 DCHECK(IsPowerOfTwo(n)); 198 while (!grouped_and_sorted_fields->empty()) { 199 mirror::ArtField* field = grouped_and_sorted_fields->front(); 200 Primitive::Type type = field->GetTypeAsPrimitiveType(); 201 if (Primitive::ComponentSize(type) < n) { 202 break; 203 } 204 if (!IsAligned<n>(field_offset->Uint32Value())) { 205 MemberOffset old_offset = *field_offset; 206 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 207 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 208 } 209 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 210 grouped_and_sorted_fields->pop_front(); 211 if (!gaps->empty() && gaps->top().size >= n) { 212 FieldGap gap = gaps->top(); 213 gaps->pop(); 214 DCHECK(IsAligned<n>(gap.start_offset)); 215 field->SetOffset(MemberOffset(gap.start_offset)); 216 if (gap.size > n) { 217 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 218 } 219 } else { 220 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 221 field->SetOffset(*field_offset); 222 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 223 } 224 ++(*current_field_idx); 225 } 226} 227 228ClassLinker::ClassLinker(InternTable* intern_table) 229 // dex_lock_ is recursive as it may be used in stack dumping. 230 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 231 dex_cache_image_class_lookup_required_(false), 232 failed_dex_cache_class_lookups_(0), 233 class_roots_(nullptr), 234 array_iftable_(nullptr), 235 find_array_class_cache_next_victim_(0), 236 init_done_(false), 237 log_new_dex_caches_roots_(false), 238 log_new_class_table_roots_(false), 239 intern_table_(intern_table), 240 portable_resolution_trampoline_(nullptr), 241 quick_resolution_trampoline_(nullptr), 242 portable_imt_conflict_trampoline_(nullptr), 243 quick_imt_conflict_trampoline_(nullptr), 244 quick_generic_jni_trampoline_(nullptr), 245 quick_to_interpreter_bridge_trampoline_(nullptr), 246 image_pointer_size_(sizeof(void*)) { 247 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 248} 249 250void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 251 VLOG(startup) << "ClassLinker::Init"; 252 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 253 254 CHECK(!init_done_); 255 256 // java_lang_Class comes first, it's needed for AllocClass 257 Thread* self = Thread::Current(); 258 gc::Heap* heap = Runtime::Current()->GetHeap(); 259 // The GC can't handle an object with a null class since we can't get the size of this object. 260 heap->IncrementDisableMovingGC(self); 261 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 262 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 263 heap->AllocNonMovableObject<true>(self, nullptr, 264 mirror::Class::ClassClassSize(), 265 VoidFunctor())))); 266 CHECK(java_lang_Class.Get() != nullptr); 267 mirror::Class::SetClassClass(java_lang_Class.Get()); 268 java_lang_Class->SetClass(java_lang_Class.Get()); 269 if (kUseBakerOrBrooksReadBarrier) { 270 java_lang_Class->AssertReadBarrierPointer(); 271 } 272 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 273 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 274 heap->DecrementDisableMovingGC(self); 275 // AllocClass(mirror::Class*) can now be used 276 277 // Class[] is used for reflection support. 278 Handle<mirror::Class> class_array_class(hs.NewHandle( 279 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 280 class_array_class->SetComponentType(java_lang_Class.Get()); 281 282 // java_lang_Object comes next so that object_array_class can be created. 283 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 284 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 285 CHECK(java_lang_Object.Get() != nullptr); 286 // backfill Object as the super class of Class. 287 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 288 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 289 290 // Object[] next to hold class roots. 291 Handle<mirror::Class> object_array_class(hs.NewHandle( 292 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 293 object_array_class->SetComponentType(java_lang_Object.Get()); 294 295 // Setup the char (primitive) class to be used for char[]. 296 Handle<mirror::Class> char_class(hs.NewHandle( 297 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 298 // The primitive char class won't be initialized by 299 // InitializePrimitiveClass until line 459, but strings (and 300 // internal char arrays) will be allocated before that and the 301 // component size, which is computed from the primitive type, needs 302 // to be set here. 303 char_class->SetPrimitiveType(Primitive::kPrimChar); 304 305 // Setup the char[] class to be used for String. 306 Handle<mirror::Class> char_array_class(hs.NewHandle( 307 AllocClass(self, java_lang_Class.Get(), 308 mirror::Array::ClassSize()))); 309 char_array_class->SetComponentType(char_class.Get()); 310 mirror::CharArray::SetArrayClass(char_array_class.Get()); 311 312 // Setup String. 313 Handle<mirror::Class> java_lang_String(hs.NewHandle( 314 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 315 mirror::String::SetClass(java_lang_String.Get()); 316 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 317 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 318 319 // Setup Reference. 320 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 322 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 323 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 324 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 325 326 // Create storage for root classes, save away our work so far (requires descriptors). 327 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 328 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 329 kClassRootsMax)); 330 CHECK(!class_roots_.IsNull()); 331 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 332 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 333 SetClassRoot(kClassArrayClass, class_array_class.Get()); 334 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 335 SetClassRoot(kCharArrayClass, char_array_class.Get()); 336 SetClassRoot(kJavaLangString, java_lang_String.Get()); 337 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 338 339 // Setup the primitive type classes. 340 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 341 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 342 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 343 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 344 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 345 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 346 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 347 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 348 349 // Create array interface entries to populate once we can load system classes. 350 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 351 352 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 353 Handle<mirror::Class> int_array_class(hs.NewHandle( 354 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 355 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 356 mirror::IntArray::SetArrayClass(int_array_class.Get()); 357 SetClassRoot(kIntArrayClass, int_array_class.Get()); 358 359 // now that these are registered, we can use AllocClass() and AllocObjectArray 360 361 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 362 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 363 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 364 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 365 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 366 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 367 368 // Constructor, Field, Method, and AbstractMethod are necessary so 369 // that FindClass can link members. 370 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 371 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 372 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 373 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 374 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 375 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 376 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 377 378 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 379 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 380 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 381 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 382 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 383 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 384 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 385 386 // Set up array classes for string, field, method 387 Handle<mirror::Class> object_array_string(hs.NewHandle( 388 AllocClass(self, java_lang_Class.Get(), 389 mirror::ObjectArray<mirror::String>::ClassSize()))); 390 object_array_string->SetComponentType(java_lang_String.Get()); 391 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 392 393 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 394 AllocClass(self, java_lang_Class.Get(), 395 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 396 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 397 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 398 399 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 400 AllocClass(self, java_lang_Class.Get(), 401 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 402 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 403 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 404 405 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 406 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 407 // these roots. 408 CHECK_NE(0U, boot_class_path.size()); 409 for (const DexFile* dex_file : boot_class_path) { 410 CHECK(dex_file != nullptr); 411 AppendToBootClassPath(self, *dex_file); 412 } 413 414 // now we can use FindSystemClass 415 416 // run char class through InitializePrimitiveClass to finish init 417 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 418 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 419 420 // Create runtime resolution and imt conflict methods. Also setup the default imt. 421 Runtime* runtime = Runtime::Current(); 422 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 423 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 424 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 425 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 426 427 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 428 // we do not need friend classes or a publicly exposed setter. 429 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 430 if (!runtime->IsCompiler()) { 431 // We need to set up the generic trampolines since we don't have an image. 432 quick_resolution_trampoline_ = GetQuickResolutionStub(); 433 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 434 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 435 } 436 437 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 438 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 439 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 440 CHECK_EQ(java_lang_Object.Get(), Object_class); 441 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 442 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 443 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 444 std::ostringstream os1, os2; 445 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 446 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 447 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 448 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 449 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 450 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 451 CHECK_EQ(java_lang_String.Get(), String_class); 452 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 453 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 454 455 // Setup the primitive array type classes - can't be done until Object has a vtable. 456 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 457 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 458 459 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 460 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 461 462 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 463 CHECK_EQ(char_array_class.Get(), found_char_array_class); 464 465 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 466 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 467 468 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 469 CHECK_EQ(int_array_class.Get(), found_int_array_class); 470 471 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 472 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 473 474 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 475 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 476 477 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 478 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 479 480 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 481 CHECK_EQ(class_array_class.Get(), found_class_array_class); 482 483 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 484 CHECK_EQ(object_array_class.Get(), found_object_array_class); 485 486 // Setup the single, global copy of "iftable". 487 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 488 CHECK(java_lang_Cloneable != nullptr); 489 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 490 CHECK(java_io_Serializable != nullptr); 491 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 492 // crawl up and explicitly list all of the supers as well. 493 { 494 mirror::IfTable* array_iftable = array_iftable_.Read(); 495 array_iftable->SetInterface(0, java_lang_Cloneable); 496 array_iftable->SetInterface(1, java_io_Serializable); 497 } 498 499 // Sanity check Class[] and Object[]'s interfaces. 500 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 501 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 502 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 503 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 504 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 505 // dex_cache_ fields and register them in class_table_. 506 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 507 CHECK_EQ(java_lang_Class.Get(), Class_class); 508 509 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 510 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 511 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 512 513 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 514 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 515 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 516 517 mirror::Class* String_array_class = 518 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 519 CHECK_EQ(object_array_string.Get(), String_array_class); 520 521 mirror::Class* Art_method_array_class = 522 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 523 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 524 525 mirror::Class* Art_field_array_class = 526 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 527 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 528 529 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 530 531 // Create java.lang.reflect.Proxy root. 532 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 533 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 534 535 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 536 // finish initializing Reference class 537 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 538 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 539 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 540 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 541 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 542 mirror::Class* java_lang_ref_FinalizerReference = 543 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 544 java_lang_ref_FinalizerReference->SetAccessFlags( 545 java_lang_ref_FinalizerReference->GetAccessFlags() | 546 kAccClassIsReference | kAccClassIsFinalizerReference); 547 mirror::Class* java_lang_ref_PhantomReference = 548 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 549 java_lang_ref_PhantomReference->SetAccessFlags( 550 java_lang_ref_PhantomReference->GetAccessFlags() | 551 kAccClassIsReference | kAccClassIsPhantomReference); 552 mirror::Class* java_lang_ref_SoftReference = 553 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 554 java_lang_ref_SoftReference->SetAccessFlags( 555 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 556 mirror::Class* java_lang_ref_WeakReference = 557 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 558 java_lang_ref_WeakReference->SetAccessFlags( 559 java_lang_ref_WeakReference->GetAccessFlags() | 560 kAccClassIsReference | kAccClassIsWeakReference); 561 562 // Setup the ClassLoader, verifying the object_size_. 563 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 564 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 565 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 566 567 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 568 // java.lang.StackTraceElement as a convenience. 569 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 570 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 571 SetClassRoot(kJavaLangClassNotFoundException, 572 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 573 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 574 SetClassRoot(kJavaLangStackTraceElementArrayClass, 575 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 576 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 577 578 FinishInit(self); 579 580 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 581} 582 583void ClassLinker::FinishInit(Thread* self) { 584 VLOG(startup) << "ClassLinker::FinishInit entering"; 585 586 // Let the heap know some key offsets into java.lang.ref instances 587 // Note: we hard code the field indexes here rather than using FindInstanceField 588 // as the types of the field can't be resolved prior to the runtime being 589 // fully initialized 590 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 591 mirror::Class* java_lang_ref_FinalizerReference = 592 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 593 594 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 595 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 596 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 597 598 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 599 CHECK_STREQ(queue->GetName(), "queue"); 600 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 601 602 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 603 CHECK_STREQ(queueNext->GetName(), "queueNext"); 604 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 605 606 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 607 CHECK_STREQ(referent->GetName(), "referent"); 608 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 609 610 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 611 CHECK_STREQ(zombie->GetName(), "zombie"); 612 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 613 614 // ensure all class_roots_ are initialized 615 for (size_t i = 0; i < kClassRootsMax; i++) { 616 ClassRoot class_root = static_cast<ClassRoot>(i); 617 mirror::Class* klass = GetClassRoot(class_root); 618 CHECK(klass != nullptr); 619 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 620 // note SetClassRoot does additional validation. 621 // if possible add new checks there to catch errors early 622 } 623 624 CHECK(!array_iftable_.IsNull()); 625 626 // disable the slow paths in FindClass and CreatePrimitiveClass now 627 // that Object, Class, and Object[] are setup 628 init_done_ = true; 629 630 VLOG(startup) << "ClassLinker::FinishInit exiting"; 631} 632 633void ClassLinker::RunRootClinits() { 634 Thread* self = Thread::Current(); 635 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 636 mirror::Class* c = GetClassRoot(ClassRoot(i)); 637 if (!c->IsArrayClass() && !c->IsPrimitive()) { 638 StackHandleScope<1> hs(self); 639 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 640 EnsureInitialized(self, h_class, true, true); 641 self->AssertNoPendingException(); 642 } 643 } 644} 645 646bool ClassLinker::GenerateOatFile(const char* dex_filename, 647 int oat_fd, 648 const char* oat_cache_filename, 649 std::string* error_msg) { 650 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 651 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 652 653 gc::Heap* heap = Runtime::Current()->GetHeap(); 654 std::string boot_image_option("--boot-image="); 655 if (heap->GetImageSpace() == nullptr) { 656 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 657 // out of space anyway it might not matter. 658 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 659 "without an image.", dex_filename); 660 return false; 661 } 662 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 663 664 std::string dex_file_option("--dex-file="); 665 dex_file_option += dex_filename; 666 667 std::string oat_fd_option("--oat-fd="); 668 StringAppendF(&oat_fd_option, "%d", oat_fd); 669 670 std::string oat_location_option("--oat-location="); 671 oat_location_option += oat_cache_filename; 672 673 std::vector<std::string> argv; 674 argv.push_back(dex2oat); 675 argv.push_back("--runtime-arg"); 676 argv.push_back("-classpath"); 677 argv.push_back("--runtime-arg"); 678 argv.push_back(Runtime::Current()->GetClassPathString()); 679 680 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 681 682 if (!Runtime::Current()->IsVerificationEnabled()) { 683 argv.push_back("--compiler-filter=verify-none"); 684 } 685 686 if (Runtime::Current()->MustRelocateIfPossible()) { 687 argv.push_back("--runtime-arg"); 688 argv.push_back("-Xrelocate"); 689 } else { 690 argv.push_back("--runtime-arg"); 691 argv.push_back("-Xnorelocate"); 692 } 693 694 if (!kIsTargetBuild) { 695 argv.push_back("--host"); 696 } 697 698 argv.push_back(boot_image_option); 699 argv.push_back(dex_file_option); 700 argv.push_back(oat_fd_option); 701 argv.push_back(oat_location_option); 702 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 703 for (size_t i = 0; i < compiler_options.size(); ++i) { 704 argv.push_back(compiler_options[i].c_str()); 705 } 706 707 return Exec(argv, error_msg); 708} 709 710const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 711 WriterMutexLock mu(Thread::Current(), dex_lock_); 712 if (kIsDebugBuild) { 713 for (size_t i = 0; i < oat_files_.size(); ++i) { 714 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 715 } 716 } 717 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 718 oat_files_.push_back(oat_file); 719 return oat_file; 720} 721 722OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 723 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 724 OatFile* oat_file = space->ReleaseOatFile(); 725 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 726 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 727 return *oat_file; 728} 729 730const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 731 const char* dex_location = dex_file.GetLocation().c_str(); 732 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 733 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 734} 735 736const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 737 const char* dex_location, 738 const uint32_t* dex_location_checksum) { 739 ReaderMutexLock mu(Thread::Current(), dex_lock_); 740 for (const OatFile* oat_file : oat_files_) { 741 DCHECK(oat_file != nullptr); 742 743 if (oat_location != nullptr) { 744 if (oat_file->GetLocation() != oat_location) { 745 continue; 746 } 747 } 748 749 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 750 dex_location_checksum, 751 false); 752 if (oat_dex_file != nullptr) { 753 return oat_dex_file; 754 } 755 } 756 return nullptr; 757} 758 759 760// Loads all multi dex files from the given oat file returning true on success. 761// 762// Parameters: 763// oat_file - the oat file to load from 764// dex_location - the dex location used to generate the oat file 765// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 766// generated - whether or not the oat_file existed before or was just (re)generated 767// error_msgs - any error messages will be appended here 768// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 769static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 770 const char* dex_location, 771 const uint32_t* dex_location_checksum, 772 bool generated, 773 std::vector<std::string>* error_msgs, 774 std::vector<const DexFile*>* dex_files) { 775 if (oat_file == nullptr) { 776 return false; 777 } 778 779 size_t old_size = dex_files->size(); // To rollback on error. 780 781 bool success = true; 782 for (size_t i = 0; success; ++i) { 783 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 784 const char* next_name = next_name_str.c_str(); 785 786 uint32_t next_location_checksum; 787 uint32_t* next_location_checksum_pointer = &next_location_checksum; 788 std::string error_msg; 789 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 790 // When i=0 the multidex name should be the same as the location name. We already have the 791 // checksum it so we don't need to recompute it. 792 if (dex_location_checksum == nullptr) { 793 next_location_checksum_pointer = nullptr; 794 } else { 795 next_location_checksum = *dex_location_checksum; 796 } 797 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 798 DCHECK_EQ(false, i == 0 && generated); 799 next_location_checksum_pointer = nullptr; 800 } 801 802 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 803 804 if (oat_dex_file == nullptr) { 805 if (i == 0 && generated) { 806 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 807 " file'%s'", dex_location, next_location_checksum, 808 oat_file->GetLocation().c_str()); 809 error_msgs->push_back(error_msg); 810 } 811 break; // Not found, done. 812 } 813 814 // Checksum test. Test must succeed when generated. 815 success = !generated; 816 if (next_location_checksum_pointer != nullptr) { 817 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 818 } 819 820 if (success) { 821 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 822 if (dex_file == nullptr) { 823 success = false; 824 error_msgs->push_back(error_msg); 825 } else { 826 dex_files->push_back(dex_file); 827 } 828 } 829 830 // When we generated the file, we expect success, or something is terribly wrong. 831 CHECK_EQ(false, generated && !success) 832 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 833 << std::hex << " dex_location_checksum=" << next_location_checksum 834 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 835 } 836 837 if (dex_files->size() == old_size) { 838 success = false; // We did not even find classes.dex 839 } 840 841 if (success) { 842 return true; 843 } else { 844 // Free all the dex files we have loaded. 845 auto it = dex_files->begin() + old_size; 846 auto it_end = dex_files->end(); 847 for (; it != it_end; it++) { 848 delete *it; 849 } 850 dex_files->erase(dex_files->begin() + old_size, it_end); 851 852 return false; 853 } 854} 855 856// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 857// complicates the loading process, as we should not use an iterative loading process, because that 858// would register the oat file and dex files that come before the broken one. Instead, check all 859// multidex ahead of time. 860bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 861 std::vector<std::string>* error_msgs, 862 std::vector<const DexFile*>* dex_files) { 863 // 1) Check whether we have an open oat file. 864 // This requires a dex checksum, use the "primary" one. 865 uint32_t dex_location_checksum; 866 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 867 bool have_checksum = true; 868 std::string checksum_error_msg; 869 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 870 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 871 dex_location_checksum_pointer = nullptr; 872 have_checksum = false; 873 } 874 875 bool needs_registering = false; 876 877 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 878 dex_location_checksum_pointer); 879 std::unique_ptr<const OatFile> open_oat_file( 880 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 881 882 // 2) If we do not have an open one, maybe there's one on disk already. 883 884 // In case the oat file is not open, we play a locking game here so 885 // that if two different processes race to load and register or generate 886 // (or worse, one tries to open a partial generated file) we will be okay. 887 // This is actually common with apps that use DexClassLoader to work 888 // around the dex method reference limit and that have a background 889 // service running in a separate process. 890 ScopedFlock scoped_flock; 891 892 if (open_oat_file.get() == nullptr) { 893 if (oat_location != nullptr) { 894 // Can only do this if we have a checksum, else error. 895 if (!have_checksum) { 896 error_msgs->push_back(checksum_error_msg); 897 return false; 898 } 899 900 std::string error_msg; 901 902 // We are loading or creating one in the future. Time to set up the file lock. 903 if (!scoped_flock.Init(oat_location, &error_msg)) { 904 error_msgs->push_back(error_msg); 905 return false; 906 } 907 908 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 909 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 910 oat_location, &error_msg)); 911 912 if (open_oat_file.get() == nullptr) { 913 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 914 dex_location, oat_location, error_msg.c_str()); 915 VLOG(class_linker) << compound_msg; 916 error_msgs->push_back(compound_msg); 917 } 918 } else { 919 // TODO: What to lock here? 920 bool obsolete_file_cleanup_failed; 921 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 922 dex_location_checksum_pointer, 923 kRuntimeISA, error_msgs, 924 &obsolete_file_cleanup_failed)); 925 // There's no point in going forward and eventually try to regenerate the 926 // file if we couldn't remove the obsolete one. Mostly likely we will fail 927 // with the same error when trying to write the new file. 928 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 929 if (obsolete_file_cleanup_failed) { 930 return false; 931 } 932 } 933 needs_registering = true; 934 } 935 936 // 3) If we have an oat file, check all contained multidex files for our dex_location. 937 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 938 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 939 dex_location_checksum_pointer, 940 false, error_msgs, dex_files); 941 if (success) { 942 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 943 if (needs_registering) { 944 // We opened the oat file, so we must register it. 945 RegisterOatFile(oat_file); 946 } 947 // If the file isn't executable we failed patchoat but did manage to get the dex files. 948 return oat_file->IsExecutable(); 949 } else { 950 if (needs_registering) { 951 // We opened it, delete it. 952 open_oat_file.reset(); 953 } else { 954 open_oat_file.release(); // Do not delete open oat files. 955 } 956 } 957 958 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 959 960 // Need a checksum, fail else. 961 if (!have_checksum) { 962 error_msgs->push_back(checksum_error_msg); 963 return false; 964 } 965 966 // Look in cache location if no oat_location is given. 967 std::string cache_location; 968 if (oat_location == nullptr) { 969 // Use the dalvik cache. 970 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 971 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 972 oat_location = cache_location.c_str(); 973 } 974 975 bool has_flock = true; 976 // Definitely need to lock now. 977 if (!scoped_flock.HasFile()) { 978 std::string error_msg; 979 if (!scoped_flock.Init(oat_location, &error_msg)) { 980 error_msgs->push_back(error_msg); 981 has_flock = false; 982 } 983 } 984 985 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 986 // Create the oat file. 987 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 988 oat_location, error_msgs)); 989 } 990 991 // Failed, bail. 992 if (open_oat_file.get() == nullptr) { 993 std::string error_msg; 994 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 995 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 996 error_msgs->push_back(error_msg); 997 return false; 998 } 999 1000 // Try to load again, but stronger checks. 1001 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1002 dex_location_checksum_pointer, 1003 true, error_msgs, dex_files); 1004 if (success) { 1005 RegisterOatFile(open_oat_file.release()); 1006 return true; 1007 } else { 1008 return false; 1009 } 1010} 1011 1012const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1013 uint32_t dex_location_checksum, 1014 const char* oat_location, 1015 std::string* error_msg) { 1016 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1017 !Runtime::Current()->IsCompiler(), 1018 error_msg)); 1019 if (oat_file.get() == nullptr) { 1020 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1021 error_msg->c_str()); 1022 return nullptr; 1023 } 1024 Runtime* runtime = Runtime::Current(); 1025 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1026 if (image_space != nullptr) { 1027 const ImageHeader& image_header = image_space->GetImageHeader(); 1028 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1029 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1030 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1031 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1032 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1033 actual_image_oat_checksum); 1034 return nullptr; 1035 } 1036 1037 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1038 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1039 if (expected_image_oat_offset != actual_image_oat_offset) { 1040 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1041 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1042 actual_image_oat_offset); 1043 return nullptr; 1044 } 1045 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1046 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1047 if (expected_patch_delta != actual_patch_delta) { 1048 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1049 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1050 return nullptr; 1051 } 1052 } 1053 1054 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1055 &dex_location_checksum); 1056 if (oat_dex_file == nullptr) { 1057 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1058 dex_location); 1059 return nullptr; 1060 } 1061 uint32_t expected_dex_checksum = dex_location_checksum; 1062 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1063 if (expected_dex_checksum != actual_dex_checksum) { 1064 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1065 "found 0x%x", oat_location, expected_dex_checksum, 1066 actual_dex_checksum); 1067 return nullptr; 1068 } 1069 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1070 if (dex_file.get() != nullptr) { 1071 return oat_file.release(); 1072 } else { 1073 return nullptr; 1074 } 1075} 1076 1077const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1078 int fd, const char* oat_location, 1079 std::vector<std::string>* error_msgs) { 1080 // Generate the output oat file for the dex file 1081 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1082 std::string error_msg; 1083 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1084 CHECK(!error_msg.empty()); 1085 error_msgs->push_back(error_msg); 1086 return nullptr; 1087 } 1088 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1089 !Runtime::Current()->IsCompiler(), 1090 &error_msg)); 1091 if (oat_file.get() == nullptr) { 1092 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1093 oat_location, error_msg.c_str()); 1094 error_msgs->push_back(compound_msg); 1095 return nullptr; 1096 } 1097 1098 return oat_file.release(); 1099} 1100 1101bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1102 const InstructionSet instruction_set) { 1103 Runtime* runtime = Runtime::Current(); 1104 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1105 if (image_space == nullptr) { 1106 return false; 1107 } 1108 uint32_t image_oat_checksum = 0; 1109 if (instruction_set == kRuntimeISA) { 1110 const ImageHeader& image_header = image_space->GetImageHeader(); 1111 image_oat_checksum = image_header.GetOatChecksum(); 1112 } else { 1113 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1114 image_space->GetImageLocation().c_str(), instruction_set)); 1115 image_oat_checksum = image_header->GetOatChecksum(); 1116 } 1117 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1118} 1119 1120bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1121 const InstructionSet instruction_set, 1122 std::string* error_msg) { 1123 Runtime* runtime = Runtime::Current(); 1124 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1125 if (image_space == nullptr) { 1126 *error_msg = "No image space for verification against"; 1127 return false; 1128 } 1129 1130 // If the requested instruction set is the same as the current runtime, 1131 // we can use the checksums directly. If it isn't, we'll have to read the 1132 // image header from the image for the right instruction set. 1133 uint32_t image_oat_checksum = 0; 1134 uintptr_t image_oat_data_begin = 0; 1135 int32_t image_patch_delta = 0; 1136 if (instruction_set == runtime->GetInstructionSet()) { 1137 const ImageHeader& image_header = image_space->GetImageHeader(); 1138 image_oat_checksum = image_header.GetOatChecksum(); 1139 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1140 image_patch_delta = image_header.GetPatchDelta(); 1141 } else { 1142 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1143 image_space->GetImageLocation().c_str(), instruction_set)); 1144 image_oat_checksum = image_header->GetOatChecksum(); 1145 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1146 image_patch_delta = image_header->GetPatchDelta(); 1147 } 1148 const OatHeader& oat_header = oat_file->GetOatHeader(); 1149 bool ret = (oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum); 1150 1151 // If the oat file is PIC, it doesn't care if/how image was relocated. Ignore these checks. 1152 if (!oat_file->IsPic()) { 1153 ret = ret && (oat_header.GetImagePatchDelta() == image_patch_delta) 1154 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin); 1155 } 1156 if (!ret) { 1157 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1158 oat_file->GetLocation().c_str(), 1159 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1160 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1161 oat_file->GetOatHeader().GetImagePatchDelta(), 1162 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1163 } 1164 return ret; 1165} 1166 1167bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1168 const char* dex_location, 1169 uint32_t dex_location_checksum, 1170 const InstructionSet instruction_set, 1171 std::string* error_msg) { 1172 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1173 return false; 1174 } 1175 1176 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1177 &dex_location_checksum); 1178 if (oat_dex_file == nullptr) { 1179 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1180 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1181 for (const OatFile::OatDexFile* oat_dex_file_in : oat_file->GetOatDexFiles()) { 1182 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1183 oat_file->GetLocation().c_str(), 1184 oat_dex_file_in->GetDexFileLocation().c_str(), 1185 oat_dex_file_in->GetDexFileLocationChecksum()); 1186 } 1187 return false; 1188 } 1189 1190 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1191 return true; 1192} 1193 1194bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1195 const char* dex_location, 1196 const uint32_t* dex_location_checksum, 1197 std::string* error_msg) { 1198 CHECK(oat_file != nullptr); 1199 CHECK(dex_location != nullptr); 1200 std::unique_ptr<const DexFile> dex_file; 1201 if (dex_location_checksum == nullptr) { 1202 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1203 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1204 // directory. 1205 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1206 if (oat_dex_file == nullptr) { 1207 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1208 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1209 error_msg->c_str()); 1210 return false; 1211 } 1212 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1213 } else { 1214 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1215 kRuntimeISA, error_msg); 1216 if (!verified) { 1217 return false; 1218 } 1219 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1220 dex_location_checksum)->OpenDexFile(error_msg)); 1221 } 1222 return dex_file.get() != nullptr; 1223} 1224 1225const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1226 const char* dex_location, 1227 const uint32_t* dex_location_checksum, 1228 InstructionSet isa, 1229 std::vector<std::string>* error_msgs, 1230 bool* obsolete_file_cleanup_failed) { 1231 *obsolete_file_cleanup_failed = false; 1232 bool already_opened = false; 1233 std::string dex_location_str(dex_location); 1234 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1235 &already_opened, 1236 obsolete_file_cleanup_failed, 1237 error_msgs)); 1238 std::string error_msg; 1239 if (oat_file.get() == nullptr) { 1240 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1241 dex_location)); 1242 return nullptr; 1243 } else if (oat_file->IsExecutable() && 1244 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1245 dex_location_checksum, &error_msg)) { 1246 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1247 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1248 error_msg.c_str())); 1249 return nullptr; 1250 } else if (!oat_file->IsExecutable() && 1251 Runtime::Current()->GetHeap()->HasImageSpace() && 1252 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1253 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1254 "dex location '%s'. Image checksum incorrect.", 1255 oat_file->GetLocation().c_str(), dex_location)); 1256 return nullptr; 1257 } else { 1258 return oat_file.release(); 1259 } 1260} 1261 1262const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1263 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1264 for (size_t i = 0; i < oat_files_.size(); i++) { 1265 const OatFile* oat_file = oat_files_[i]; 1266 DCHECK(oat_file != nullptr); 1267 if (oat_file->GetLocation() == oat_location) { 1268 return oat_file; 1269 } 1270 } 1271 return nullptr; 1272} 1273 1274const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1275 InstructionSet isa, 1276 bool *already_opened, 1277 bool *obsolete_file_cleanup_failed, 1278 std::vector<std::string>* error_msgs) { 1279 // Find out if we've already opened the file 1280 const OatFile* ret = nullptr; 1281 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1282 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1283 if (ret != nullptr) { 1284 *already_opened = true; 1285 return ret; 1286 } 1287 1288 std::string dalvik_cache; 1289 bool have_android_data = false; 1290 bool have_dalvik_cache = false; 1291 bool is_global_cache = false; 1292 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1293 &have_android_data, &have_dalvik_cache, &is_global_cache); 1294 std::string cache_filename; 1295 if (have_dalvik_cache) { 1296 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1297 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1298 if (ret != nullptr) { 1299 *already_opened = true; 1300 return ret; 1301 } 1302 } else { 1303 // If we need to relocate we should just place odex back where it started. 1304 cache_filename = odex_filename; 1305 } 1306 1307 ret = nullptr; 1308 1309 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1310 // 1311 // Now we do the following: 1312 // 1) Try and open the odex version 1313 // 2) If present, checksum-verified & relocated correctly return it 1314 // 3) Close the odex version to free up its address space. 1315 // 4) Try and open the cache version 1316 // 5) If present, checksum-verified & relocated correctly return it 1317 // 6) Close the cache version to free up its address space. 1318 // 7) If we should relocate: 1319 // a) If we have opened and checksum-verified the odex version relocate it to 1320 // 'cache_filename' and return it 1321 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1322 // it. This should not happen often (I think only the run-test's will hit this case). 1323 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1324 // this point. 1325 // 9) Return nullptr 1326 1327 *already_opened = false; 1328 const Runtime* runtime = Runtime::Current(); 1329 CHECK(runtime != nullptr); 1330 bool executable = !runtime->IsCompiler(); 1331 1332 std::string odex_error_msg; 1333 bool should_patch_system = false; 1334 bool odex_checksum_verified = false; 1335 bool have_system_odex = false; 1336 { 1337 // There is a high probability that both these oat files map similar/the same address 1338 // spaces so we must scope them like this so they each gets its turn. 1339 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1340 nullptr, 1341 executable, &odex_error_msg)); 1342 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1343 &odex_checksum_verified, 1344 &odex_error_msg)) { 1345 return odex_oat_file.release(); 1346 } else { 1347 if (odex_checksum_verified) { 1348 // We can just relocate 1349 should_patch_system = true; 1350 odex_error_msg = "Image Patches are incorrect"; 1351 } 1352 if (odex_oat_file.get() != nullptr) { 1353 have_system_odex = true; 1354 } 1355 } 1356 } 1357 1358 std::string cache_error_msg; 1359 bool should_patch_cache = false; 1360 bool cache_checksum_verified = false; 1361 if (have_dalvik_cache) { 1362 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1363 nullptr, 1364 executable, &cache_error_msg)); 1365 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1366 &cache_checksum_verified, 1367 &cache_error_msg)) { 1368 return cache_oat_file.release(); 1369 } else if (cache_checksum_verified) { 1370 // We can just relocate 1371 should_patch_cache = true; 1372 cache_error_msg = "Image Patches are incorrect"; 1373 } 1374 } else if (have_android_data) { 1375 // dalvik_cache does not exist but android data does. This means we should be able to create 1376 // it, so we should try. 1377 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1378 } 1379 1380 ret = nullptr; 1381 std::string error_msg; 1382 if (runtime->CanRelocate()) { 1383 // Run relocation 1384 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1385 if (space != nullptr) { 1386 const std::string& image_location = space->GetImageLocation(); 1387 if (odex_checksum_verified && should_patch_system) { 1388 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1389 } else if (cache_checksum_verified && should_patch_cache) { 1390 CHECK(have_dalvik_cache); 1391 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1392 } 1393 } else if (have_system_odex) { 1394 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1395 } 1396 } 1397 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1398 // implicitly: were able to fine where the cached version is but we were unable to use it, 1399 // either as a destination for relocation or to open a file. We should delete it if it is 1400 // there. 1401 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1402 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1403 "searching for dex file %s: %s", 1404 cache_filename.c_str(), dex_location.c_str(), 1405 strerror(errno)); 1406 error_msgs->push_back(rm_error_msg); 1407 VLOG(class_linker) << rm_error_msg; 1408 // Let the caller know that we couldn't remove the obsolete file. 1409 // This is a good indication that further writes may fail as well. 1410 *obsolete_file_cleanup_failed = true; 1411 } 1412 } 1413 if (ret == nullptr) { 1414 VLOG(class_linker) << error_msg; 1415 error_msgs->push_back(error_msg); 1416 std::string relocation_msg; 1417 if (runtime->CanRelocate()) { 1418 relocation_msg = StringPrintf(" and relocation failed"); 1419 } 1420 if (have_dalvik_cache && cache_checksum_verified) { 1421 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1422 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1423 cache_filename.c_str(), cache_error_msg.c_str(), 1424 relocation_msg.c_str()); 1425 } else { 1426 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1427 "dalvik_cache availible)%s.", odex_filename.c_str(), 1428 odex_error_msg.c_str(), relocation_msg.c_str()); 1429 } 1430 VLOG(class_linker) << error_msg; 1431 error_msgs->push_back(error_msg); 1432 } 1433 return ret; 1434} 1435 1436const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1437 InstructionSet isa, 1438 std::string* error_msg) { 1439 // We open it non-executable 1440 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, nullptr, false, error_msg)); 1441 if (output.get() == nullptr) { 1442 return nullptr; 1443 } 1444 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1445 VerifyOatImageChecksum(output.get(), isa)) { 1446 return output.release(); 1447 } else { 1448 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1449 oat_path.c_str()); 1450 return nullptr; 1451 } 1452} 1453 1454const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1455 const std::string& output_oat, 1456 const std::string& image_location, 1457 InstructionSet isa, 1458 std::string* error_msg) { 1459 Runtime* runtime = Runtime::Current(); 1460 DCHECK(runtime != nullptr); 1461 if (!runtime->GetHeap()->HasImageSpace()) { 1462 // We don't have an image space so there is no point in trying to patchoat. 1463 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1464 << "running without an image. Attempting to use oat file for interpretation."; 1465 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1466 } 1467 if (!runtime->IsDex2OatEnabled()) { 1468 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1469 // input_oat but make sure we only do interpretation on it's dex files. 1470 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1471 << "disabled. Attempting to use oat file for interpretation"; 1472 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1473 } 1474 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1475 std::string patchoat(runtime->GetPatchoatExecutable()); 1476 1477 std::string isa_arg("--instruction-set="); 1478 isa_arg += GetInstructionSetString(isa); 1479 std::string input_oat_filename_arg("--input-oat-file="); 1480 input_oat_filename_arg += input_oat; 1481 std::string output_oat_filename_arg("--output-oat-file="); 1482 output_oat_filename_arg += output_oat; 1483 std::string patched_image_arg("--patched-image-location="); 1484 patched_image_arg += image_location; 1485 1486 std::vector<std::string> argv; 1487 argv.push_back(patchoat); 1488 argv.push_back(isa_arg); 1489 argv.push_back(input_oat_filename_arg); 1490 argv.push_back(output_oat_filename_arg); 1491 argv.push_back(patched_image_arg); 1492 1493 std::string command_line(Join(argv, ' ')); 1494 LOG(INFO) << "Relocate Oat File: " << command_line; 1495 bool success = Exec(argv, error_msg); 1496 if (success) { 1497 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr, 1498 !runtime->IsCompiler(), error_msg)); 1499 bool checksum_verified = false; 1500 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1501 error_msg)) { 1502 return output.release(); 1503 } else if (output.get() != nullptr) { 1504 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1505 "but output file '%s' failed verifcation: %s", 1506 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1507 } else { 1508 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1509 "but was unable to open output file '%s': %s", 1510 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1511 } 1512 } else if (!runtime->IsCompiler()) { 1513 // patchoat failed which means we probably don't have enough room to place the output oat file, 1514 // instead of failing we should just run the interpreter from the dex files in the input oat. 1515 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1516 << "for interpretation. patchoat failure was: " << *error_msg; 1517 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1518 } else { 1519 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1520 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1521 error_msg->c_str()); 1522 } 1523 return nullptr; 1524} 1525 1526bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1527 bool* checksum_verified, 1528 std::string* error_msg) { 1529 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1530 if (image_space == nullptr) { 1531 *error_msg = "No image space present"; 1532 return false; 1533 } 1534 uint32_t real_image_checksum; 1535 void* real_image_oat_offset; 1536 int32_t real_patch_delta; 1537 if (isa == runtime->GetInstructionSet()) { 1538 const ImageHeader& image_header = image_space->GetImageHeader(); 1539 real_image_checksum = image_header.GetOatChecksum(); 1540 real_image_oat_offset = image_header.GetOatDataBegin(); 1541 real_patch_delta = image_header.GetPatchDelta(); 1542 } else { 1543 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1544 image_space->GetImageLocation().c_str(), isa)); 1545 real_image_checksum = image_header->GetOatChecksum(); 1546 real_image_oat_offset = image_header->GetOatDataBegin(); 1547 real_patch_delta = image_header->GetPatchDelta(); 1548 } 1549 1550 const OatHeader& oat_header = oat_file->GetOatHeader(); 1551 std::string compound_msg; 1552 1553 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1554 *checksum_verified = oat_image_checksum == real_image_checksum; 1555 if (!*checksum_verified) { 1556 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1557 real_image_checksum, oat_image_checksum); 1558 } 1559 1560 bool offset_verified; 1561 bool patch_delta_verified; 1562 1563 if (!oat_file->IsPic()) { 1564 // If an oat file is not PIC, we need to check that the image is at the expected location and 1565 // patched in the same way. 1566 void* oat_image_oat_offset = 1567 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1568 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1569 if (!offset_verified) { 1570 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1571 real_image_oat_offset, oat_image_oat_offset); 1572 } 1573 1574 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1575 patch_delta_verified = oat_patch_delta == real_patch_delta; 1576 if (!patch_delta_verified) { 1577 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, " 1578 "received 0x%x)", real_patch_delta, oat_patch_delta); 1579 } 1580 } else { 1581 // If an oat file is PIC, we ignore offset and patching delta. 1582 offset_verified = true; 1583 patch_delta_verified = true; 1584 } 1585 1586 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1587 if (!ret) { 1588 *error_msg = "Oat file failed to verify:" + compound_msg; 1589 } 1590 return ret; 1591} 1592 1593const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1594 std::string* error_msg) { 1595 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1596 if (oat_file != nullptr) { 1597 return oat_file; 1598 } 1599 1600 return OatFile::Open(oat_location, oat_location, nullptr, nullptr, !Runtime::Current()->IsCompiler(), 1601 error_msg); 1602} 1603 1604static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1605 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1606 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1607 1608 DCHECK(obj != nullptr); 1609 DCHECK(class_linker != nullptr); 1610 1611 if (obj->IsArtMethod()) { 1612 mirror::ArtMethod* method = obj->AsArtMethod(); 1613 if (!method->IsNative()) { 1614 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 1615 if (method != Runtime::Current()->GetResolutionMethod()) { 1616 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1617 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1618 } 1619 } 1620 } 1621} 1622 1623void ClassLinker::InitFromImage() { 1624 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1625 CHECK(!init_done_); 1626 1627 Thread* self = Thread::Current(); 1628 gc::Heap* heap = Runtime::Current()->GetHeap(); 1629 gc::space::ImageSpace* space = heap->GetImageSpace(); 1630 dex_cache_image_class_lookup_required_ = true; 1631 CHECK(space != nullptr); 1632 OatFile& oat_file = GetImageOatFile(space); 1633 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1634 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1635 const char* image_file_location = oat_file.GetOatHeader(). 1636 GetStoreValueByKey(OatHeader::kImageLocationKey); 1637 CHECK(image_file_location == nullptr || *image_file_location == 0); 1638 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1639 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1640 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1641 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1642 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1643 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1644 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1645 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1646 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1647 1648 StackHandleScope<1> hs(self); 1649 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1650 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1651 AsObjectArray<mirror::Class>())); 1652 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1653 1654 // Special case of setting up the String class early so that we can test arbitrary objects 1655 // as being Strings or not 1656 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1657 1658 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1659 static_cast<uint32_t>(dex_caches->GetLength())); 1660 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1661 StackHandleScope<1> hs2(self); 1662 Handle<mirror::DexCache> dex_cache(hs2.NewHandle(dex_caches->Get(i))); 1663 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1664 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1665 nullptr); 1666 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1667 std::string error_msg; 1668 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1669 if (dex_file == nullptr) { 1670 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1671 << " from within oat file " << oat_file.GetLocation() 1672 << " error '" << error_msg << "'"; 1673 UNREACHABLE(); 1674 } 1675 1676 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1677 1678 AppendToBootClassPath(*dex_file, dex_cache); 1679 } 1680 1681 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1682 // bitmap walk. 1683 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1684 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 1685 if (!Runtime::Current()->IsCompiler()) { 1686 // Compiler supports having an image with a different pointer size than the runtime. This 1687 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 1688 // also use 32 bit dex2oat on a system with 64 bit apps. 1689 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 1690 << sizeof(void*); 1691 } 1692 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 1693 image_pointer_size_ = 4; 1694 } else { 1695 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 1696 image_pointer_size_ = 8; 1697 } 1698 1699 // Set entry point to interpreter if in InterpretOnly mode. 1700 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1701 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1702 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1703 } 1704 1705 // reinit class_roots_ 1706 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1707 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1708 1709 // reinit array_iftable_ from any array class instance, they should be == 1710 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1711 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1712 // String class root was set above 1713 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1714 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1715 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1716 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1717 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1718 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1719 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1720 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1721 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1722 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1723 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1724 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1725 1726 FinishInit(self); 1727 1728 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1729} 1730 1731void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1732 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1733 if ((flags & kVisitRootFlagAllRoots) != 0) { 1734 for (GcRoot<mirror::Class>& root : class_table_) { 1735 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1736 } 1737 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1738 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1739 } 1740 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1741 for (auto& root : new_class_roots_) { 1742 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 1743 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1744 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 1745 if (UNLIKELY(new_ref != old_ref)) { 1746 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1747 // corresponding object. This is slow, but luckily for us, this may only happen with a 1748 // concurrent moving GC. 1749 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 1750 class_table_.Erase(it); 1751 class_table_.Insert(GcRoot<mirror::Class>(new_ref)); 1752 } 1753 } 1754 } 1755 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1756 new_class_roots_.clear(); 1757 } 1758 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1759 log_new_class_table_roots_ = true; 1760 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1761 log_new_class_table_roots_ = false; 1762 } 1763 // We deliberately ignore the class roots in the image since we 1764 // handle image roots by using the MS/CMS rescanning of dirty cards. 1765} 1766 1767// Keep in sync with InitCallback. Anything we visit, we need to 1768// reinit references to when reinitializing a ClassLinker from a 1769// mapped image. 1770void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1771 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1772 Thread* self = Thread::Current(); 1773 { 1774 ReaderMutexLock mu(self, dex_lock_); 1775 if ((flags & kVisitRootFlagAllRoots) != 0) { 1776 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1777 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1778 } 1779 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1780 for (size_t index : new_dex_cache_roots_) { 1781 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1782 } 1783 } 1784 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1785 new_dex_cache_roots_.clear(); 1786 } 1787 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1788 log_new_dex_caches_roots_ = true; 1789 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1790 log_new_dex_caches_roots_ = false; 1791 } 1792 } 1793 VisitClassRoots(callback, arg, flags); 1794 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1795 DCHECK(!array_iftable_.IsNull()); 1796 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1797 if (!find_array_class_cache_[i].IsNull()) { 1798 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1799 } 1800 } 1801} 1802 1803void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1804 if (dex_cache_image_class_lookup_required_) { 1805 MoveImageClassesToClassTable(); 1806 } 1807 // TODO: why isn't this a ReaderMutexLock? 1808 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1809 for (GcRoot<mirror::Class>& root : class_table_) { 1810 if (!visitor(root.Read(), arg)) { 1811 return; 1812 } 1813 } 1814 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1815 if (!visitor(root.Read(), arg)) { 1816 return; 1817 } 1818 } 1819} 1820 1821static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1822 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1823 classes->insert(c); 1824 return true; 1825} 1826 1827struct GetClassesVisitorArrayArg { 1828 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1829 int32_t index; 1830 bool success; 1831}; 1832 1833static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1834 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1835 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1836 if (arg->index < (*arg->classes)->GetLength()) { 1837 (*arg->classes)->Set(arg->index, c); 1838 arg->index++; 1839 return true; 1840 } else { 1841 arg->success = false; 1842 return false; 1843 } 1844} 1845 1846void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1847 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1848 // is avoiding duplicates. 1849 if (!kMovingClasses) { 1850 std::set<mirror::Class*> classes; 1851 VisitClasses(GetClassesVisitorSet, &classes); 1852 for (mirror::Class* klass : classes) { 1853 if (!visitor(klass, arg)) { 1854 return; 1855 } 1856 } 1857 } else { 1858 Thread* self = Thread::Current(); 1859 StackHandleScope<1> hs(self); 1860 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1861 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1862 GetClassesVisitorArrayArg local_arg; 1863 local_arg.classes = &classes; 1864 local_arg.success = false; 1865 // We size the array assuming classes won't be added to the class table during the visit. 1866 // If this assumption fails we iterate again. 1867 while (!local_arg.success) { 1868 size_t class_table_size; 1869 { 1870 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1871 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1872 } 1873 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1874 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1875 classes.Assign( 1876 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1877 CHECK(classes.Get() != nullptr); // OOME. 1878 local_arg.index = 0; 1879 local_arg.success = true; 1880 VisitClasses(GetClassesVisitorArray, &local_arg); 1881 } 1882 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1883 // If the class table shrank during creation of the clases array we expect null elements. If 1884 // the class table grew then the loop repeats. If classes are created after the loop has 1885 // finished then we don't visit. 1886 mirror::Class* klass = classes->Get(i); 1887 if (klass != nullptr && !visitor(klass, arg)) { 1888 return; 1889 } 1890 } 1891 } 1892} 1893 1894ClassLinker::~ClassLinker() { 1895 mirror::Class::ResetClass(); 1896 mirror::String::ResetClass(); 1897 mirror::Reference::ResetClass(); 1898 mirror::ArtField::ResetClass(); 1899 mirror::ArtMethod::ResetClass(); 1900 mirror::BooleanArray::ResetArrayClass(); 1901 mirror::ByteArray::ResetArrayClass(); 1902 mirror::CharArray::ResetArrayClass(); 1903 mirror::DoubleArray::ResetArrayClass(); 1904 mirror::FloatArray::ResetArrayClass(); 1905 mirror::IntArray::ResetArrayClass(); 1906 mirror::LongArray::ResetArrayClass(); 1907 mirror::ShortArray::ResetArrayClass(); 1908 mirror::Throwable::ResetClass(); 1909 mirror::StackTraceElement::ResetClass(); 1910 STLDeleteElements(&boot_class_path_); 1911 STLDeleteElements(&oat_files_); 1912} 1913 1914mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1915 gc::Heap* heap = Runtime::Current()->GetHeap(); 1916 StackHandleScope<16> hs(self); 1917 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1918 Handle<mirror::DexCache> dex_cache( 1919 hs.NewHandle(down_cast<mirror::DexCache*>( 1920 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1921 VoidFunctor())))); 1922 if (dex_cache.Get() == nullptr) { 1923 return nullptr; 1924 } 1925 Handle<mirror::String> 1926 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1927 if (location.Get() == nullptr) { 1928 return nullptr; 1929 } 1930 Handle<mirror::ObjectArray<mirror::String>> 1931 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1932 if (strings.Get() == nullptr) { 1933 return nullptr; 1934 } 1935 Handle<mirror::ObjectArray<mirror::Class>> 1936 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1937 if (types.Get() == nullptr) { 1938 return nullptr; 1939 } 1940 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1941 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1942 if (methods.Get() == nullptr) { 1943 return nullptr; 1944 } 1945 Handle<mirror::ObjectArray<mirror::ArtField>> 1946 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1947 if (fields.Get() == nullptr) { 1948 return nullptr; 1949 } 1950 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1951 fields.Get()); 1952 return dex_cache.Get(); 1953} 1954 1955mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1956 uint32_t class_size) { 1957 DCHECK_GE(class_size, sizeof(mirror::Class)); 1958 gc::Heap* heap = Runtime::Current()->GetHeap(); 1959 mirror::Class::InitializeClassVisitor visitor(class_size); 1960 mirror::Object* k = kMovingClasses ? 1961 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1962 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1963 if (UNLIKELY(k == nullptr)) { 1964 CHECK(self->IsExceptionPending()); // OOME. 1965 return nullptr; 1966 } 1967 return k->AsClass(); 1968} 1969 1970mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1971 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1972} 1973 1974mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1975 return down_cast<mirror::ArtField*>( 1976 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1977} 1978 1979mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1980 return down_cast<mirror::ArtMethod*>( 1981 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1982} 1983 1984mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1985 Thread* self, size_t length) { 1986 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1987 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1988} 1989 1990mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1991 mirror::Class* klass) { 1992 DCHECK(klass != nullptr); 1993 1994 // For temporary classes we must wait for them to be retired. 1995 if (init_done_ && klass->IsTemp()) { 1996 CHECK(!klass->IsResolved()); 1997 if (klass->IsErroneous()) { 1998 ThrowEarlierClassFailure(klass); 1999 return nullptr; 2000 } 2001 StackHandleScope<1> hs(self); 2002 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2003 ObjectLock<mirror::Class> lock(self, h_class); 2004 // Loop and wait for the resolving thread to retire this class. 2005 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2006 lock.WaitIgnoringInterrupts(); 2007 } 2008 if (h_class->IsErroneous()) { 2009 ThrowEarlierClassFailure(h_class.Get()); 2010 return nullptr; 2011 } 2012 CHECK(h_class->IsRetired()); 2013 // Get the updated class from class table. 2014 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor), 2015 h_class.Get()->GetClassLoader()); 2016 } 2017 2018 // Wait for the class if it has not already been linked. 2019 if (!klass->IsResolved() && !klass->IsErroneous()) { 2020 StackHandleScope<1> hs(self); 2021 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2022 ObjectLock<mirror::Class> lock(self, h_class); 2023 // Check for circular dependencies between classes. 2024 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2025 ThrowClassCircularityError(h_class.Get()); 2026 h_class->SetStatus(mirror::Class::kStatusError, self); 2027 return nullptr; 2028 } 2029 // Wait for the pending initialization to complete. 2030 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2031 lock.WaitIgnoringInterrupts(); 2032 } 2033 } 2034 2035 if (klass->IsErroneous()) { 2036 ThrowEarlierClassFailure(klass); 2037 return nullptr; 2038 } 2039 // Return the loaded class. No exceptions should be pending. 2040 CHECK(klass->IsResolved()) << PrettyClass(klass); 2041 self->AssertNoPendingException(); 2042 return klass; 2043} 2044 2045typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2046 2047// Search a collection of DexFiles for a descriptor 2048ClassPathEntry FindInClassPath(const char* descriptor, 2049 size_t hash, const std::vector<const DexFile*>& class_path) { 2050 for (const DexFile* dex_file : class_path) { 2051 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2052 if (dex_class_def != nullptr) { 2053 return ClassPathEntry(dex_file, dex_class_def); 2054 } 2055 } 2056 return ClassPathEntry(nullptr, nullptr); 2057} 2058 2059mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2060 Thread* self, const char* descriptor, 2061 size_t hash, 2062 Handle<mirror::ClassLoader> class_loader) { 2063 // Can we special case for a well understood PathClassLoader with the BootClassLoader as parent? 2064 if (class_loader->GetClass() != 2065 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2066 class_loader->GetParent()->GetClass() != 2067 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2068 return nullptr; 2069 } 2070 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2071 // Check if this would be found in the parent boot class loader. 2072 if (pair.second != nullptr) { 2073 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr); 2074 if (klass != nullptr) { 2075 // May return null if resolution on another thread fails. 2076 klass = EnsureResolved(self, descriptor, klass); 2077 } else { 2078 // May OOME. 2079 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2080 *pair.second); 2081 } 2082 if (klass == nullptr) { 2083 CHECK(self->IsExceptionPending()) << descriptor; 2084 self->ClearException(); 2085 } 2086 return klass; 2087 } else { 2088 // Handle as if this is the child PathClassLoader. 2089 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension). 2090 StackHandleScope<3> hs(self); 2091 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2092 // We need to get the DexPathList and loop through it. 2093 Handle<mirror::ArtField> cookie_field = 2094 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2095 Handle<mirror::ArtField> dex_file_field = 2096 hs.NewHandle( 2097 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2098 mirror::Object* dex_path_list = 2099 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2100 GetObject(class_loader.Get()); 2101 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2102 cookie_field.Get() != nullptr) { 2103 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2104 mirror::Object* dex_elements_obj = 2105 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2106 GetObject(dex_path_list); 2107 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2108 // at the mCookie which is a DexFile vector. 2109 if (dex_elements_obj != nullptr) { 2110 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2111 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2112 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2113 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2114 if (element == nullptr) { 2115 // Should never happen, fall back to java code to throw a NPE. 2116 break; 2117 } 2118 mirror::Object* dex_file = dex_file_field->GetObject(element); 2119 if (dex_file != nullptr) { 2120 const uint64_t cookie = cookie_field->GetLong(dex_file); 2121 auto* dex_files = 2122 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2123 if (dex_files == nullptr) { 2124 // This should never happen so log a warning. 2125 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2126 break; 2127 } 2128 for (const DexFile* cp_dex_file : *dex_files) { 2129 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash); 2130 if (dex_class_def != nullptr) { 2131 RegisterDexFile(*cp_dex_file); 2132 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, 2133 *cp_dex_file, *dex_class_def); 2134 if (klass == nullptr) { 2135 CHECK(self->IsExceptionPending()) << descriptor; 2136 self->ClearException(); 2137 return nullptr; 2138 } 2139 return klass; 2140 } 2141 } 2142 } 2143 } 2144 } 2145 } 2146 self->AssertNoPendingException(); 2147 return nullptr; 2148 } 2149} 2150 2151mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2152 Handle<mirror::ClassLoader> class_loader) { 2153 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2154 DCHECK(self != nullptr); 2155 self->AssertNoPendingException(); 2156 if (descriptor[1] == '\0') { 2157 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2158 // for primitive classes that aren't backed by dex files. 2159 return FindPrimitiveClass(descriptor[0]); 2160 } 2161 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 2162 // Find the class in the loaded classes table. 2163 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get()); 2164 if (klass != nullptr) { 2165 return EnsureResolved(self, descriptor, klass); 2166 } 2167 // Class is not yet loaded. 2168 if (descriptor[0] == '[') { 2169 return CreateArrayClass(self, descriptor, hash, class_loader); 2170 } else if (class_loader.Get() == nullptr) { 2171 // The boot class loader, search the boot class path. 2172 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2173 if (pair.second != nullptr) { 2174 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2175 *pair.second); 2176 } else { 2177 // The boot class loader is searched ahead of the application class loader, failures are 2178 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2179 // trigger the chaining with a proper stack trace. 2180 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2181 self->SetException(ThrowLocation(), pre_allocated); 2182 return nullptr; 2183 } 2184 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2185 // First try with the bootstrap class loader. 2186 if (class_loader.Get() != nullptr) { 2187 klass = LookupClass(self, descriptor, hash, nullptr); 2188 if (klass != nullptr) { 2189 return EnsureResolved(self, descriptor, klass); 2190 } 2191 } 2192 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2193 // a NoClassDefFoundError being allocated. 2194 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2195 if (pair.second != nullptr) { 2196 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2197 *pair.second); 2198 } 2199 // Next try the compile time class path. 2200 const std::vector<const DexFile*>* class_path; 2201 { 2202 ScopedObjectAccessUnchecked soa(self); 2203 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2204 soa.AddLocalReference<jobject>(class_loader.Get())); 2205 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2206 } 2207 pair = FindInClassPath(descriptor, hash, *class_path); 2208 if (pair.second != nullptr) { 2209 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 2210 } else { 2211 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2212 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2213 self->SetException(ThrowLocation(), pre_allocated); 2214 return nullptr; 2215 } 2216 } else { 2217 ScopedObjectAccessUnchecked soa(self); 2218 mirror::Class* cp_klass = FindClassInPathClassLoader(soa, self, descriptor, hash, 2219 class_loader); 2220 if (cp_klass != nullptr) { 2221 return cp_klass; 2222 } 2223 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2224 soa.AddLocalReference<jobject>(class_loader.Get())); 2225 std::string class_name_string(DescriptorToDot(descriptor)); 2226 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2227 { 2228 ScopedThreadStateChange tsc(self, kNative); 2229 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2230 soa.Env()->NewStringUTF(class_name_string.c_str())); 2231 if (class_name_object.get() == nullptr) { 2232 DCHECK(self->IsExceptionPending()); // OOME. 2233 return nullptr; 2234 } 2235 CHECK(class_loader_object.get() != nullptr); 2236 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2237 WellKnownClasses::java_lang_ClassLoader_loadClass, 2238 class_name_object.get())); 2239 } 2240 if (self->IsExceptionPending()) { 2241 // If the ClassLoader threw, pass that exception up. 2242 return nullptr; 2243 } else if (result.get() == nullptr) { 2244 // broken loader - throw NPE to be compatible with Dalvik 2245 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2246 class_name_string.c_str()).c_str()); 2247 return nullptr; 2248 } else { 2249 // success, return mirror::Class* 2250 return soa.Decode<mirror::Class*>(result.get()); 2251 } 2252 } 2253 UNREACHABLE(); 2254} 2255 2256mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 2257 Handle<mirror::ClassLoader> class_loader, 2258 const DexFile& dex_file, 2259 const DexFile::ClassDef& dex_class_def) { 2260 StackHandleScope<3> hs(self); 2261 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2262 2263 // Load the class from the dex file. 2264 if (UNLIKELY(!init_done_)) { 2265 // finish up init of hand crafted class_roots_ 2266 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2267 klass.Assign(GetClassRoot(kJavaLangObject)); 2268 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2269 klass.Assign(GetClassRoot(kJavaLangClass)); 2270 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2271 klass.Assign(GetClassRoot(kJavaLangString)); 2272 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2273 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2274 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2275 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2276 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2277 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2278 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2279 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2280 } 2281 } 2282 2283 if (klass.Get() == nullptr) { 2284 // Allocate a class with the status of not ready. 2285 // Interface object should get the right size here. Regular class will 2286 // figure out the right size later and be replaced with one of the right 2287 // size when the class becomes resolved. 2288 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2289 } 2290 if (UNLIKELY(klass.Get() == nullptr)) { 2291 CHECK(self->IsExceptionPending()); // Expect an OOME. 2292 return nullptr; 2293 } 2294 klass->SetDexCache(FindDexCache(dex_file)); 2295 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2296 ObjectLock<mirror::Class> lock(self, klass); 2297 if (self->IsExceptionPending()) { 2298 // An exception occured during load, set status to erroneous while holding klass' lock in case 2299 // notification is necessary. 2300 if (!klass->IsErroneous()) { 2301 klass->SetStatus(mirror::Class::kStatusError, self); 2302 } 2303 return nullptr; 2304 } 2305 klass->SetClinitThreadId(self->GetTid()); 2306 2307 // Add the newly loaded class to the loaded classes table. 2308 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 2309 if (existing != nullptr) { 2310 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2311 // this thread to block. 2312 return EnsureResolved(self, descriptor, existing); 2313 } 2314 2315 // Finish loading (if necessary) by finding parents 2316 CHECK(!klass->IsLoaded()); 2317 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2318 // Loading failed. 2319 if (!klass->IsErroneous()) { 2320 klass->SetStatus(mirror::Class::kStatusError, self); 2321 } 2322 return nullptr; 2323 } 2324 CHECK(klass->IsLoaded()); 2325 // Link the class (if necessary) 2326 CHECK(!klass->IsResolved()); 2327 // TODO: Use fast jobjects? 2328 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2329 2330 mirror::Class* new_class = nullptr; 2331 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2332 // Linking failed. 2333 if (!klass->IsErroneous()) { 2334 klass->SetStatus(mirror::Class::kStatusError, self); 2335 } 2336 return nullptr; 2337 } 2338 self->AssertNoPendingException(); 2339 CHECK(new_class != nullptr) << descriptor; 2340 CHECK(new_class->IsResolved()) << descriptor; 2341 2342 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2343 2344 /* 2345 * We send CLASS_PREPARE events to the debugger from here. The 2346 * definition of "preparation" is creating the static fields for a 2347 * class and initializing them to the standard default values, but not 2348 * executing any code (that comes later, during "initialization"). 2349 * 2350 * We did the static preparation in LinkClass. 2351 * 2352 * The class has been prepared and resolved but possibly not yet verified 2353 * at this point. 2354 */ 2355 Dbg::PostClassPrepare(new_class_h.Get()); 2356 2357 return new_class_h.Get(); 2358} 2359 2360uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2361 const DexFile::ClassDef& dex_class_def) { 2362 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2363 size_t num_ref = 0; 2364 size_t num_8 = 0; 2365 size_t num_16 = 0; 2366 size_t num_32 = 0; 2367 size_t num_64 = 0; 2368 if (class_data != nullptr) { 2369 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2370 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2371 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2372 char c = descriptor[0]; 2373 switch (c) { 2374 case 'L': 2375 case '[': 2376 num_ref++; 2377 break; 2378 case 'J': 2379 case 'D': 2380 num_64++; 2381 break; 2382 case 'I': 2383 case 'F': 2384 num_32++; 2385 break; 2386 case 'S': 2387 case 'C': 2388 num_16++; 2389 break; 2390 case 'B': 2391 case 'Z': 2392 num_8++; 2393 break; 2394 default: 2395 LOG(FATAL) << "Unknown descriptor: " << c; 2396 UNREACHABLE(); 2397 } 2398 } 2399 } 2400 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2401} 2402 2403OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2404 bool* found) { 2405 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2406 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2407 if (oat_dex_file == nullptr) { 2408 *found = false; 2409 return OatFile::OatClass::Invalid(); 2410 } 2411 *found = true; 2412 return oat_dex_file->GetOatClass(class_def_idx); 2413} 2414 2415static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2416 uint32_t method_idx) { 2417 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2418 const uint8_t* class_data = dex_file.GetClassData(class_def); 2419 CHECK(class_data != nullptr); 2420 ClassDataItemIterator it(dex_file, class_data); 2421 // Skip fields 2422 while (it.HasNextStaticField()) { 2423 it.Next(); 2424 } 2425 while (it.HasNextInstanceField()) { 2426 it.Next(); 2427 } 2428 // Process methods 2429 size_t class_def_method_index = 0; 2430 while (it.HasNextDirectMethod()) { 2431 if (it.GetMemberIndex() == method_idx) { 2432 return class_def_method_index; 2433 } 2434 class_def_method_index++; 2435 it.Next(); 2436 } 2437 while (it.HasNextVirtualMethod()) { 2438 if (it.GetMemberIndex() == method_idx) { 2439 return class_def_method_index; 2440 } 2441 class_def_method_index++; 2442 it.Next(); 2443 } 2444 DCHECK(!it.HasNext()); 2445 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2446 UNREACHABLE(); 2447} 2448 2449const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2450 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2451 // method for direct methods (or virtual methods made direct). 2452 mirror::Class* declaring_class = method->GetDeclaringClass(); 2453 size_t oat_method_index; 2454 if (method->IsStatic() || method->IsDirect()) { 2455 // Simple case where the oat method index was stashed at load time. 2456 oat_method_index = method->GetMethodIndex(); 2457 } else { 2458 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2459 // by search for its position in the declared virtual methods. 2460 oat_method_index = declaring_class->NumDirectMethods(); 2461 size_t end = declaring_class->NumVirtualMethods(); 2462 bool found_virtual = false; 2463 for (size_t i = 0; i < end; i++) { 2464 // Check method index instead of identity in case of duplicate method definitions. 2465 if (method->GetDexMethodIndex() == 2466 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2467 found_virtual = true; 2468 break; 2469 } 2470 oat_method_index++; 2471 } 2472 CHECK(found_virtual) << "Didn't find oat method index for virtual method: " 2473 << PrettyMethod(method); 2474 } 2475 DCHECK_EQ(oat_method_index, 2476 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2477 method->GetDeclaringClass()->GetDexClassDefIndex(), 2478 method->GetDexMethodIndex())); 2479 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2480 declaring_class->GetDexClassDefIndex(), 2481 found); 2482 if (!(*found)) { 2483 return OatFile::OatMethod::Invalid(); 2484 } 2485 return oat_class.GetOatMethod(oat_method_index); 2486} 2487 2488// Special case to get oat code without overwriting a trampoline. 2489const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2490 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2491 if (method->IsProxyMethod()) { 2492 return GetQuickProxyInvokeHandler(); 2493 } 2494 bool found; 2495 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2496 const void* result = nullptr; 2497 if (found) { 2498 result = oat_method.GetQuickCode(); 2499 } 2500 2501 if (result == nullptr) { 2502 if (method->IsNative()) { 2503 // No code and native? Use generic trampoline. 2504 result = GetQuickGenericJniStub(); 2505 } else if (method->IsPortableCompiled()) { 2506 // No code? Do we expect portable code? 2507 result = GetQuickToPortableBridge(); 2508 } else { 2509 // No code? You must mean to go into the interpreter. 2510 result = GetQuickToInterpreterBridge(); 2511 } 2512 } 2513 return result; 2514} 2515 2516const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2517 bool* have_portable_code) { 2518 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2519 *have_portable_code = false; 2520 if (method->IsProxyMethod()) { 2521 return GetPortableProxyInvokeHandler(); 2522 } 2523 bool found; 2524 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2525 const void* result = nullptr; 2526 const void* quick_code = nullptr; 2527 if (found) { 2528 result = oat_method.GetPortableCode(); 2529 quick_code = oat_method.GetQuickCode(); 2530 } 2531 2532 if (result == nullptr) { 2533 if (quick_code == nullptr) { 2534 // No code? You must mean to go into the interpreter. 2535 result = GetPortableToInterpreterBridge(); 2536 } else { 2537 // No code? But there's quick code, so use a bridge. 2538 result = GetPortableToQuickBridge(); 2539 } 2540 } else { 2541 *have_portable_code = true; 2542 } 2543 return result; 2544} 2545 2546const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2547 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2548 return nullptr; 2549 } 2550 bool found; 2551 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2552 return found ? oat_method.GetQuickCode() : nullptr; 2553} 2554 2555const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2556 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2557 return nullptr; 2558 } 2559 bool found; 2560 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2561 return found ? oat_method.GetPortableCode() : nullptr; 2562} 2563 2564const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2565 uint32_t method_idx) { 2566 bool found; 2567 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2568 if (!found) { 2569 return nullptr; 2570 } 2571 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2572 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2573} 2574 2575const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2576 uint32_t method_idx) { 2577 bool found; 2578 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2579 if (!found) { 2580 return nullptr; 2581 } 2582 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2583 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2584} 2585 2586// Returns true if the method must run with interpreter, false otherwise. 2587static bool NeedsInterpreter( 2588 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2589 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2590 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2591 // No code: need interpreter. 2592 // May return true for native code, in the case of generic JNI 2593 // DCHECK(!method->IsNative()); 2594 return true; 2595 } 2596#ifdef ART_SEA_IR_MODE 2597 ScopedObjectAccess soa(Thread::Current()); 2598 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2599 LOG(INFO) << "Found " << PrettyMethod(method); 2600 return false; 2601 } 2602#endif 2603 // If interpreter mode is enabled, every method (except native and proxy) must 2604 // be run with interpreter. 2605 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2606 !method->IsNative() && !method->IsProxyMethod(); 2607} 2608 2609void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2610 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2611 if (klass->NumDirectMethods() == 0) { 2612 return; // No direct methods => no static methods. 2613 } 2614 Runtime* runtime = Runtime::Current(); 2615 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2616 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2617 return; // OAT file unavailable. 2618 } 2619 } 2620 2621 const DexFile& dex_file = klass->GetDexFile(); 2622 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2623 CHECK(dex_class_def != nullptr); 2624 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2625 // There should always be class data if there were direct methods. 2626 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2627 ClassDataItemIterator it(dex_file, class_data); 2628 // Skip fields 2629 while (it.HasNextStaticField()) { 2630 it.Next(); 2631 } 2632 while (it.HasNextInstanceField()) { 2633 it.Next(); 2634 } 2635 bool has_oat_class; 2636 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2637 &has_oat_class); 2638 // Link the code of methods skipped by LinkCode. 2639 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2640 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2641 if (!method->IsStatic()) { 2642 // Only update static methods. 2643 continue; 2644 } 2645 const void* portable_code = nullptr; 2646 const void* quick_code = nullptr; 2647 if (has_oat_class) { 2648 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2649 portable_code = oat_method.GetPortableCode(); 2650 quick_code = oat_method.GetQuickCode(); 2651 } 2652 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2653 bool have_portable_code = false; 2654 if (enter_interpreter) { 2655 // Use interpreter entry point. 2656 // Check whether the method is native, in which case it's generic JNI. 2657 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2658 quick_code = GetQuickGenericJniStub(); 2659 portable_code = GetPortableToQuickBridge(); 2660 } else { 2661 portable_code = GetPortableToInterpreterBridge(); 2662 quick_code = GetQuickToInterpreterBridge(); 2663 } 2664 } else { 2665 if (portable_code == nullptr) { 2666 portable_code = GetPortableToQuickBridge(); 2667 } else { 2668 have_portable_code = true; 2669 } 2670 if (quick_code == nullptr) { 2671 quick_code = GetQuickToPortableBridge(); 2672 } 2673 } 2674 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2675 have_portable_code); 2676 } 2677 // Ignore virtual methods on the iterator. 2678} 2679 2680void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2681 const OatFile::OatClass* oat_class, 2682 uint32_t class_def_method_index) { 2683 Runtime* runtime = Runtime::Current(); 2684 if (runtime->IsCompiler()) { 2685 // The following code only applies to a non-compiler runtime. 2686 return; 2687 } 2688 // Method shouldn't have already been linked. 2689 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2690 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2691 if (oat_class != nullptr) { 2692 // Every kind of method should at least get an invoke stub from the oat_method. 2693 // non-abstract methods also get their code pointers. 2694 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index); 2695 oat_method.LinkMethod(method.Get()); 2696 } 2697 2698 // Install entry point from interpreter. 2699 bool enter_interpreter = NeedsInterpreter(method.Get(), 2700 method->GetEntryPointFromQuickCompiledCode(), 2701 method->GetEntryPointFromPortableCompiledCode()); 2702 if (enter_interpreter && !method->IsNative()) { 2703 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2704 } else { 2705 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2706 } 2707 2708 if (method->IsAbstract()) { 2709 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2710 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2711 return; 2712 } 2713 2714 bool have_portable_code = false; 2715 if (method->IsStatic() && !method->IsConstructor()) { 2716 // For static methods excluding the class initializer, install the trampoline. 2717 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2718 // after initializing class (see ClassLinker::InitializeClass method). 2719 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2720 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionStub()); 2721 } else if (enter_interpreter) { 2722 if (!method->IsNative()) { 2723 // Set entry point from compiled code if there's no code or in interpreter only mode. 2724 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2725 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2726 } else { 2727 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2728 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2729 } 2730 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2731 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2732 have_portable_code = true; 2733 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2734 } else { 2735 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2736 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2737 } 2738 2739 if (method->IsNative()) { 2740 // Unregistering restores the dlsym lookup stub. 2741 method->UnregisterNative(); 2742 2743 if (enter_interpreter) { 2744 // We have a native method here without code. Then it should have either the generic JNI 2745 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2746 // TODO: this doesn't handle all the cases where trampolines may be installed. 2747 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2748 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2749 } 2750 } 2751 2752 // Allow instrumentation its chance to hijack code. 2753 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2754 method->GetEntryPointFromQuickCompiledCode(), 2755 method->GetEntryPointFromPortableCompiledCode(), 2756 have_portable_code); 2757} 2758 2759 2760 2761void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2762 const DexFile::ClassDef& dex_class_def, 2763 Handle<mirror::Class> klass, 2764 mirror::ClassLoader* class_loader) { 2765 CHECK(klass.Get() != nullptr); 2766 CHECK(klass->GetDexCache() != nullptr); 2767 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2768 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2769 CHECK(descriptor != nullptr); 2770 2771 klass->SetClass(GetClassRoot(kJavaLangClass)); 2772 if (kUseBakerOrBrooksReadBarrier) { 2773 klass->AssertReadBarrierPointer(); 2774 } 2775 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2776 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2777 klass->SetAccessFlags(access_flags); 2778 klass->SetClassLoader(class_loader); 2779 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2780 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2781 2782 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2783 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2784 CHECK(klass->GetDexCacheStrings() != nullptr); 2785 2786 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2787 if (class_data == nullptr) { 2788 return; // no fields or methods - for example a marker interface 2789 } 2790 2791 2792 bool has_oat_class = false; 2793 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2794 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2795 &has_oat_class); 2796 if (has_oat_class) { 2797 LoadClassMembers(self, dex_file, class_data, klass, &oat_class); 2798 } 2799 } 2800 if (!has_oat_class) { 2801 LoadClassMembers(self, dex_file, class_data, klass, nullptr); 2802 } 2803} 2804 2805void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2806 const uint8_t* class_data, 2807 Handle<mirror::Class> klass, 2808 const OatFile::OatClass* oat_class) { 2809 // Load fields. 2810 ClassDataItemIterator it(dex_file, class_data); 2811 if (it.NumStaticFields() != 0) { 2812 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2813 if (UNLIKELY(statics == nullptr)) { 2814 CHECK(self->IsExceptionPending()); // OOME. 2815 return; 2816 } 2817 klass->SetSFields(statics); 2818 } 2819 if (it.NumInstanceFields() != 0) { 2820 mirror::ObjectArray<mirror::ArtField>* fields = 2821 AllocArtFieldArray(self, it.NumInstanceFields()); 2822 if (UNLIKELY(fields == nullptr)) { 2823 CHECK(self->IsExceptionPending()); // OOME. 2824 return; 2825 } 2826 klass->SetIFields(fields); 2827 } 2828 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2829 self->AllowThreadSuspension(); 2830 StackHandleScope<1> hs(self); 2831 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2832 if (UNLIKELY(sfield.Get() == nullptr)) { 2833 CHECK(self->IsExceptionPending()); // OOME. 2834 return; 2835 } 2836 klass->SetStaticField(i, sfield.Get()); 2837 LoadField(dex_file, it, klass, sfield); 2838 } 2839 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2840 self->AllowThreadSuspension(); 2841 StackHandleScope<1> hs(self); 2842 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2843 if (UNLIKELY(ifield.Get() == nullptr)) { 2844 CHECK(self->IsExceptionPending()); // OOME. 2845 return; 2846 } 2847 klass->SetInstanceField(i, ifield.Get()); 2848 LoadField(dex_file, it, klass, ifield); 2849 } 2850 2851 // Load methods. 2852 if (it.NumDirectMethods() != 0) { 2853 // TODO: append direct methods to class object 2854 mirror::ObjectArray<mirror::ArtMethod>* directs = 2855 AllocArtMethodArray(self, it.NumDirectMethods()); 2856 if (UNLIKELY(directs == nullptr)) { 2857 CHECK(self->IsExceptionPending()); // OOME. 2858 return; 2859 } 2860 klass->SetDirectMethods(directs); 2861 } 2862 if (it.NumVirtualMethods() != 0) { 2863 // TODO: append direct methods to class object 2864 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2865 AllocArtMethodArray(self, it.NumVirtualMethods()); 2866 if (UNLIKELY(virtuals == nullptr)) { 2867 CHECK(self->IsExceptionPending()); // OOME. 2868 return; 2869 } 2870 klass->SetVirtualMethods(virtuals); 2871 } 2872 size_t class_def_method_index = 0; 2873 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2874 size_t last_class_def_method_index = 0; 2875 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2876 self->AllowThreadSuspension(); 2877 StackHandleScope<1> hs(self); 2878 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2879 if (UNLIKELY(method.Get() == nullptr)) { 2880 CHECK(self->IsExceptionPending()); // OOME. 2881 return; 2882 } 2883 klass->SetDirectMethod(i, method.Get()); 2884 LinkCode(method, oat_class, class_def_method_index); 2885 uint32_t it_method_index = it.GetMemberIndex(); 2886 if (last_dex_method_index == it_method_index) { 2887 // duplicate case 2888 method->SetMethodIndex(last_class_def_method_index); 2889 } else { 2890 method->SetMethodIndex(class_def_method_index); 2891 last_dex_method_index = it_method_index; 2892 last_class_def_method_index = class_def_method_index; 2893 } 2894 class_def_method_index++; 2895 } 2896 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2897 self->AllowThreadSuspension(); 2898 StackHandleScope<1> hs(self); 2899 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2900 if (UNLIKELY(method.Get() == nullptr)) { 2901 CHECK(self->IsExceptionPending()); // OOME. 2902 return; 2903 } 2904 klass->SetVirtualMethod(i, method.Get()); 2905 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2906 LinkCode(method, oat_class, class_def_method_index); 2907 class_def_method_index++; 2908 } 2909 DCHECK(!it.HasNext()); 2910} 2911 2912void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2913 Handle<mirror::Class> klass, 2914 Handle<mirror::ArtField> dst) { 2915 uint32_t field_idx = it.GetMemberIndex(); 2916 dst->SetDexFieldIndex(field_idx); 2917 dst->SetDeclaringClass(klass.Get()); 2918 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2919} 2920 2921mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2922 const ClassDataItemIterator& it, 2923 Handle<mirror::Class> klass) { 2924 uint32_t dex_method_idx = it.GetMemberIndex(); 2925 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2926 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2927 2928 mirror::ArtMethod* dst = AllocArtMethod(self); 2929 if (UNLIKELY(dst == nullptr)) { 2930 CHECK(self->IsExceptionPending()); // OOME. 2931 return nullptr; 2932 } 2933 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2934 2935 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2936 dst->SetDexMethodIndex(dex_method_idx); 2937 dst->SetDeclaringClass(klass.Get()); 2938 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2939 2940 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2941 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2942 2943 uint32_t access_flags = it.GetMethodAccessFlags(); 2944 2945 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2946 // Set finalizable flag on declaring class. 2947 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2948 // Void return type. 2949 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2950 klass->SetFinalizable(); 2951 } else { 2952 std::string temp; 2953 const char* klass_descriptor = klass->GetDescriptor(&temp); 2954 // The Enum class declares a "final" finalize() method to prevent subclasses from 2955 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2956 // subclasses, so we exclude it here. 2957 // We also want to avoid setting the flag on Object, where we know that finalize() is 2958 // empty. 2959 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2960 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2961 klass->SetFinalizable(); 2962 } 2963 } 2964 } 2965 } else if (method_name[0] == '<') { 2966 // Fix broken access flags for initializers. Bug 11157540. 2967 bool is_init = (strcmp("<init>", method_name) == 0); 2968 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2969 if (UNLIKELY(!is_init && !is_clinit)) { 2970 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2971 } else { 2972 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2973 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2974 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2975 access_flags |= kAccConstructor; 2976 } 2977 } 2978 } 2979 dst->SetAccessFlags(access_flags); 2980 2981 return dst; 2982} 2983 2984void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2985 StackHandleScope<1> hs(self); 2986 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2987 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2988 << dex_file.GetLocation(); 2989 AppendToBootClassPath(dex_file, dex_cache); 2990} 2991 2992void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2993 Handle<mirror::DexCache> dex_cache) { 2994 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2995 boot_class_path_.push_back(&dex_file); 2996 RegisterDexFile(dex_file, dex_cache); 2997} 2998 2999bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 3000 dex_lock_.AssertSharedHeld(Thread::Current()); 3001 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3002 mirror::DexCache* dex_cache = GetDexCache(i); 3003 if (dex_cache->GetDexFile() == &dex_file) { 3004 return true; 3005 } 3006 } 3007 return false; 3008} 3009 3010bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3011 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3012 return IsDexFileRegisteredLocked(dex_file); 3013} 3014 3015void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3016 Handle<mirror::DexCache> dex_cache) { 3017 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3018 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3019 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3020 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3021 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3022 dex_cache->SetDexFile(&dex_file); 3023 if (log_new_dex_caches_roots_) { 3024 // TODO: This is not safe if we can remove dex caches. 3025 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3026 } 3027} 3028 3029void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3030 Thread* self = Thread::Current(); 3031 { 3032 ReaderMutexLock mu(self, dex_lock_); 3033 if (IsDexFileRegisteredLocked(dex_file)) { 3034 return; 3035 } 3036 } 3037 // Don't alloc while holding the lock, since allocation may need to 3038 // suspend all threads and another thread may need the dex_lock_ to 3039 // get to a suspend point. 3040 StackHandleScope<1> hs(self); 3041 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3042 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3043 << dex_file.GetLocation(); 3044 { 3045 WriterMutexLock mu(self, dex_lock_); 3046 if (IsDexFileRegisteredLocked(dex_file)) { 3047 return; 3048 } 3049 RegisterDexFileLocked(dex_file, dex_cache); 3050 } 3051} 3052 3053void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3054 Handle<mirror::DexCache> dex_cache) { 3055 WriterMutexLock mu(Thread::Current(), dex_lock_); 3056 RegisterDexFileLocked(dex_file, dex_cache); 3057} 3058 3059mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3060 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3061 // Search assuming unique-ness of dex file. 3062 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3063 mirror::DexCache* dex_cache = GetDexCache(i); 3064 if (dex_cache->GetDexFile() == &dex_file) { 3065 return dex_cache; 3066 } 3067 } 3068 // Search matching by location name. 3069 std::string location(dex_file.GetLocation()); 3070 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3071 mirror::DexCache* dex_cache = GetDexCache(i); 3072 if (dex_cache->GetDexFile()->GetLocation() == location) { 3073 return dex_cache; 3074 } 3075 } 3076 // Failure, dump diagnostic and abort. 3077 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3078 mirror::DexCache* dex_cache = GetDexCache(i); 3079 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3080 } 3081 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3082 UNREACHABLE(); 3083} 3084 3085void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3086 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3087 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3088 mirror::DexCache* dex_cache = GetDexCache(i); 3089 dex_cache->Fixup(resolution_method); 3090 } 3091} 3092 3093mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3094 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3095 if (UNLIKELY(klass == nullptr)) { 3096 return nullptr; 3097 } 3098 return InitializePrimitiveClass(klass, type); 3099} 3100 3101mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3102 Primitive::Type type) { 3103 CHECK(primitive_class != nullptr); 3104 // Must hold lock on object when initializing. 3105 Thread* self = Thread::Current(); 3106 StackHandleScope<1> hs(self); 3107 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3108 ObjectLock<mirror::Class> lock(self, h_class); 3109 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3110 primitive_class->SetPrimitiveType(type); 3111 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3112 const char* descriptor = Primitive::Descriptor(type); 3113 mirror::Class* existing = InsertClass(descriptor, primitive_class, 3114 ComputeModifiedUtf8Hash(descriptor)); 3115 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3116 return primitive_class; 3117} 3118 3119// Create an array class (i.e. the class object for the array, not the 3120// array itself). "descriptor" looks like "[C" or "[[[[B" or 3121// "[Ljava/lang/String;". 3122// 3123// If "descriptor" refers to an array of primitives, look up the 3124// primitive type's internally-generated class object. 3125// 3126// "class_loader" is the class loader of the class that's referring to 3127// us. It's used to ensure that we're looking for the element type in 3128// the right context. It does NOT become the class loader for the 3129// array class; that always comes from the base element class. 3130// 3131// Returns nullptr with an exception raised on failure. 3132mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 3133 Handle<mirror::ClassLoader> class_loader) { 3134 // Identify the underlying component type 3135 CHECK_EQ('[', descriptor[0]); 3136 StackHandleScope<2> hs(self); 3137 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3138 class_loader))); 3139 if (component_type.Get() == nullptr) { 3140 DCHECK(self->IsExceptionPending()); 3141 // We need to accept erroneous classes as component types. 3142 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 3143 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get())); 3144 if (component_type.Get() == nullptr) { 3145 DCHECK(self->IsExceptionPending()); 3146 return nullptr; 3147 } else { 3148 self->ClearException(); 3149 } 3150 } 3151 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3152 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3153 return nullptr; 3154 } 3155 // See if the component type is already loaded. Array classes are 3156 // always associated with the class loader of their underlying 3157 // element type -- an array of Strings goes with the loader for 3158 // java/lang/String -- so we need to look for it there. (The 3159 // caller should have checked for the existence of the class 3160 // before calling here, but they did so with *their* class loader, 3161 // not the component type's loader.) 3162 // 3163 // If we find it, the caller adds "loader" to the class' initiating 3164 // loader list, which should prevent us from going through this again. 3165 // 3166 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3167 // are the same, because our caller (FindClass) just did the 3168 // lookup. (Even if we get this wrong we still have correct behavior, 3169 // because we effectively do this lookup again when we add the new 3170 // class to the hash table --- necessary because of possible races with 3171 // other threads.) 3172 if (class_loader.Get() != component_type->GetClassLoader()) { 3173 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader()); 3174 if (new_class != nullptr) { 3175 return new_class; 3176 } 3177 } 3178 3179 // Fill out the fields in the Class. 3180 // 3181 // It is possible to execute some methods against arrays, because 3182 // all arrays are subclasses of java_lang_Object_, so we need to set 3183 // up a vtable. We can just point at the one in java_lang_Object_. 3184 // 3185 // Array classes are simple enough that we don't need to do a full 3186 // link step. 3187 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3188 if (UNLIKELY(!init_done_)) { 3189 // Classes that were hand created, ie not by FindSystemClass 3190 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3191 new_class.Assign(GetClassRoot(kClassArrayClass)); 3192 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3193 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3194 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3195 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3196 } else if (strcmp(descriptor, 3197 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3198 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3199 } else if (strcmp(descriptor, 3200 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3201 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3202 } else if (strcmp(descriptor, "[C") == 0) { 3203 new_class.Assign(GetClassRoot(kCharArrayClass)); 3204 } else if (strcmp(descriptor, "[I") == 0) { 3205 new_class.Assign(GetClassRoot(kIntArrayClass)); 3206 } 3207 } 3208 if (new_class.Get() == nullptr) { 3209 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3210 if (new_class.Get() == nullptr) { 3211 return nullptr; 3212 } 3213 new_class->SetComponentType(component_type.Get()); 3214 } 3215 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3216 DCHECK(new_class->GetComponentType() != nullptr); 3217 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3218 new_class->SetSuperClass(java_lang_Object); 3219 new_class->SetVTable(java_lang_Object->GetVTable()); 3220 new_class->SetPrimitiveType(Primitive::kPrimNot); 3221 new_class->SetClassLoader(component_type->GetClassLoader()); 3222 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3223 { 3224 StackHandleScope<mirror::Class::kImtSize> hs2(self, 3225 Runtime::Current()->GetImtUnimplementedMethod()); 3226 new_class->PopulateEmbeddedImtAndVTable(&hs2); 3227 } 3228 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3229 // don't need to set new_class->SetObjectSize(..) 3230 // because Object::SizeOf delegates to Array::SizeOf 3231 3232 3233 // All arrays have java/lang/Cloneable and java/io/Serializable as 3234 // interfaces. We need to set that up here, so that stuff like 3235 // "instanceof" works right. 3236 // 3237 // Note: The GC could run during the call to FindSystemClass, 3238 // so we need to make sure the class object is GC-valid while we're in 3239 // there. Do this by clearing the interface list so the GC will just 3240 // think that the entries are null. 3241 3242 3243 // Use the single, global copies of "interfaces" and "iftable" 3244 // (remember not to free them for arrays). 3245 { 3246 mirror::IfTable* array_iftable = array_iftable_.Read(); 3247 CHECK(array_iftable != nullptr); 3248 new_class->SetIfTable(array_iftable); 3249 } 3250 3251 // Inherit access flags from the component type. 3252 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3253 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3254 access_flags &= kAccJavaFlagsMask; 3255 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3256 // and remove "interface". 3257 access_flags |= kAccAbstract | kAccFinal; 3258 access_flags &= ~kAccInterface; 3259 3260 new_class->SetAccessFlags(access_flags); 3261 3262 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 3263 if (existing == nullptr) { 3264 return new_class.Get(); 3265 } 3266 // Another thread must have loaded the class after we 3267 // started but before we finished. Abandon what we've 3268 // done. 3269 // 3270 // (Yes, this happens.) 3271 3272 return existing; 3273} 3274 3275mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3276 switch (type) { 3277 case 'B': 3278 return GetClassRoot(kPrimitiveByte); 3279 case 'C': 3280 return GetClassRoot(kPrimitiveChar); 3281 case 'D': 3282 return GetClassRoot(kPrimitiveDouble); 3283 case 'F': 3284 return GetClassRoot(kPrimitiveFloat); 3285 case 'I': 3286 return GetClassRoot(kPrimitiveInt); 3287 case 'J': 3288 return GetClassRoot(kPrimitiveLong); 3289 case 'S': 3290 return GetClassRoot(kPrimitiveShort); 3291 case 'Z': 3292 return GetClassRoot(kPrimitiveBoolean); 3293 case 'V': 3294 return GetClassRoot(kPrimitiveVoid); 3295 default: 3296 break; 3297 } 3298 std::string printable_type(PrintableChar(type)); 3299 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3300 return nullptr; 3301} 3302 3303mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3304 size_t hash) { 3305 if (VLOG_IS_ON(class_linker)) { 3306 mirror::DexCache* dex_cache = klass->GetDexCache(); 3307 std::string source; 3308 if (dex_cache != nullptr) { 3309 source += " from "; 3310 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3311 } 3312 LOG(INFO) << "Loaded class " << descriptor << source; 3313 } 3314 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3315 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3316 if (existing != nullptr) { 3317 return existing; 3318 } 3319 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3320 dex_cache_image_class_lookup_required_) { 3321 // Check a class loaded with the system class loader matches one in the image if the class 3322 // is in the image. 3323 existing = LookupClassFromImage(descriptor); 3324 if (existing != nullptr) { 3325 CHECK_EQ(klass, existing); 3326 } 3327 } 3328 VerifyObject(klass); 3329 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 3330 if (log_new_class_table_roots_) { 3331 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3332 } 3333 return nullptr; 3334} 3335 3336mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3337 size_t hash) { 3338 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3339 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 3340 hash); 3341 if (existing_it == class_table_.end()) { 3342 CHECK(klass->IsProxyClass()); 3343 return nullptr; 3344 } 3345 3346 mirror::Class* existing = existing_it->Read(); 3347 CHECK_NE(existing, klass) << descriptor; 3348 CHECK(!existing->IsResolved()) << descriptor; 3349 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3350 3351 CHECK(!klass->IsTemp()) << descriptor; 3352 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3353 dex_cache_image_class_lookup_required_) { 3354 // Check a class loaded with the system class loader matches one in the image if the class 3355 // is in the image. 3356 existing = LookupClassFromImage(descriptor); 3357 if (existing != nullptr) { 3358 CHECK_EQ(klass, existing) << descriptor; 3359 } 3360 } 3361 VerifyObject(klass); 3362 3363 // Update the element in the hash set. 3364 *existing_it = GcRoot<mirror::Class>(klass); 3365 if (log_new_class_table_roots_) { 3366 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3367 } 3368 3369 return existing; 3370} 3371 3372bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 3373 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3374 auto pair = std::make_pair(descriptor, class_loader); 3375 auto it = class_table_.Find(pair); 3376 if (it != class_table_.end()) { 3377 class_table_.Erase(it); 3378 return true; 3379 } 3380 it = pre_zygote_class_table_.Find(pair); 3381 if (it != pre_zygote_class_table_.end()) { 3382 pre_zygote_class_table_.Erase(it); 3383 return true; 3384 } 3385 return false; 3386} 3387 3388mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, size_t hash, 3389 mirror::ClassLoader* class_loader) { 3390 { 3391 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3392 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3393 if (result != nullptr) { 3394 return result; 3395 } 3396 } 3397 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3398 return nullptr; 3399 } else { 3400 // Lookup failed but need to search dex_caches_. 3401 mirror::Class* result = LookupClassFromImage(descriptor); 3402 if (result != nullptr) { 3403 InsertClass(descriptor, result, hash); 3404 } else { 3405 // Searching the image dex files/caches failed, we don't want to get into this situation 3406 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3407 // classes into the class table. 3408 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3409 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3410 MoveImageClassesToClassTable(); 3411 } 3412 } 3413 return result; 3414 } 3415} 3416 3417mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3418 mirror::ClassLoader* class_loader, 3419 size_t hash) { 3420 auto descriptor_pair = std::make_pair(descriptor, class_loader); 3421 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 3422 if (it == pre_zygote_class_table_.end()) { 3423 it = class_table_.FindWithHash(descriptor_pair, hash); 3424 if (it == class_table_.end()) { 3425 return nullptr; 3426 } 3427 } 3428 return it->Read(); 3429} 3430 3431static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3432 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3433 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3434 CHECK(image != nullptr); 3435 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3436 return root->AsObjectArray<mirror::DexCache>(); 3437} 3438 3439void ClassLinker::MoveImageClassesToClassTable() { 3440 Thread* self = Thread::Current(); 3441 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3442 if (!dex_cache_image_class_lookup_required_) { 3443 return; // All dex cache classes are already in the class table. 3444 } 3445 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3446 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3447 std::string temp; 3448 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3449 mirror::DexCache* dex_cache = dex_caches->Get(i); 3450 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3451 for (int32_t j = 0; j < types->GetLength(); j++) { 3452 mirror::Class* klass = types->Get(j); 3453 if (klass != nullptr) { 3454 DCHECK(klass->GetClassLoader() == nullptr); 3455 const char* descriptor = klass->GetDescriptor(&temp); 3456 size_t hash = ComputeModifiedUtf8Hash(descriptor); 3457 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3458 if (existing != nullptr) { 3459 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 3460 << PrettyClassAndClassLoader(klass); 3461 } else { 3462 class_table_.Insert(GcRoot<mirror::Class>(klass)); 3463 if (log_new_class_table_roots_) { 3464 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3465 } 3466 } 3467 } 3468 } 3469 } 3470 dex_cache_image_class_lookup_required_ = false; 3471} 3472 3473void ClassLinker::MoveClassTableToPreZygote() { 3474 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3475 DCHECK(pre_zygote_class_table_.Empty()); 3476 pre_zygote_class_table_ = std::move(class_table_); 3477 class_table_.Clear(); 3478} 3479 3480mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3481 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3482 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3483 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3484 mirror::DexCache* dex_cache = dex_caches->Get(i); 3485 const DexFile* dex_file = dex_cache->GetDexFile(); 3486 // Try binary searching the string/type index. 3487 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3488 if (string_id != nullptr) { 3489 const DexFile::TypeId* type_id = 3490 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3491 if (type_id != nullptr) { 3492 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3493 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3494 if (klass != nullptr) { 3495 return klass; 3496 } 3497 } 3498 } 3499 } 3500 return nullptr; 3501} 3502 3503void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3504 result.clear(); 3505 if (dex_cache_image_class_lookup_required_) { 3506 MoveImageClassesToClassTable(); 3507 } 3508 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3509 while (true) { 3510 auto it = class_table_.Find(descriptor); 3511 if (it == class_table_.end()) { 3512 break; 3513 } 3514 result.push_back(it->Read()); 3515 class_table_.Erase(it); 3516 } 3517 for (mirror::Class* k : result) { 3518 class_table_.Insert(GcRoot<mirror::Class>(k)); 3519 } 3520 size_t pre_zygote_start = result.size(); 3521 // Now handle the pre zygote table. 3522 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 3523 // called from the debugger. 3524 while (true) { 3525 auto it = pre_zygote_class_table_.Find(descriptor); 3526 if (it == pre_zygote_class_table_.end()) { 3527 break; 3528 } 3529 result.push_back(it->Read()); 3530 pre_zygote_class_table_.Erase(it); 3531 } 3532 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 3533 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 3534 } 3535} 3536 3537void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3538 // TODO: assert that the monitor on the Class is held 3539 ObjectLock<mirror::Class> lock(self, klass); 3540 3541 // Don't attempt to re-verify if already sufficiently verified. 3542 if (klass->IsVerified()) { 3543 EnsurePreverifiedMethods(klass); 3544 return; 3545 } 3546 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3547 return; 3548 } 3549 3550 // The class might already be erroneous, for example at compile time if we attempted to verify 3551 // this class as a parent to another. 3552 if (klass->IsErroneous()) { 3553 ThrowEarlierClassFailure(klass.Get()); 3554 return; 3555 } 3556 3557 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3558 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3559 } else { 3560 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3561 << PrettyClass(klass.Get()); 3562 CHECK(!Runtime::Current()->IsCompiler()); 3563 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3564 } 3565 3566 // Skip verification if disabled. 3567 if (!Runtime::Current()->IsVerificationEnabled()) { 3568 klass->SetStatus(mirror::Class::kStatusVerified, self); 3569 EnsurePreverifiedMethods(klass); 3570 return; 3571 } 3572 3573 // Verify super class. 3574 StackHandleScope<2> hs(self); 3575 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3576 if (super.Get() != nullptr) { 3577 // Acquire lock to prevent races on verifying the super class. 3578 ObjectLock<mirror::Class> super_lock(self, super); 3579 3580 if (!super->IsVerified() && !super->IsErroneous()) { 3581 VerifyClass(self, super); 3582 } 3583 if (!super->IsCompileTimeVerified()) { 3584 std::string error_msg( 3585 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3586 PrettyDescriptor(klass.Get()).c_str(), 3587 PrettyDescriptor(super.Get()).c_str())); 3588 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3589 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3590 if (cause.Get() != nullptr) { 3591 self->ClearException(); 3592 } 3593 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3594 if (cause.Get() != nullptr) { 3595 self->GetException(nullptr)->SetCause(cause.Get()); 3596 } 3597 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3598 if (Runtime::Current()->IsCompiler()) { 3599 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3600 } 3601 klass->SetStatus(mirror::Class::kStatusError, self); 3602 return; 3603 } 3604 } 3605 3606 // Try to use verification information from the oat file, otherwise do runtime verification. 3607 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3608 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3609 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3610 if (oat_file_class_status == mirror::Class::kStatusError) { 3611 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3612 << PrettyDescriptor(klass.Get()) << " in " 3613 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3614 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3615 PrettyDescriptor(klass.Get()).c_str()); 3616 klass->SetStatus(mirror::Class::kStatusError, self); 3617 return; 3618 } 3619 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3620 std::string error_msg; 3621 if (!preverified) { 3622 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3623 Runtime::Current()->IsCompiler(), 3624 &error_msg); 3625 } 3626 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3627 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3628 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3629 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3630 << " because: " << error_msg; 3631 } 3632 self->AssertNoPendingException(); 3633 // Make sure all classes referenced by catch blocks are resolved. 3634 ResolveClassExceptionHandlerTypes(dex_file, klass); 3635 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3636 // Even though there were no verifier failures we need to respect whether the super-class 3637 // was verified or requiring runtime reverification. 3638 if (super.Get() == nullptr || super->IsVerified()) { 3639 klass->SetStatus(mirror::Class::kStatusVerified, self); 3640 } else { 3641 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3642 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3643 // Pretend a soft failure occured so that we don't consider the class verified below. 3644 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3645 } 3646 } else { 3647 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3648 // Soft failures at compile time should be retried at runtime. Soft 3649 // failures at runtime will be handled by slow paths in the generated 3650 // code. Set status accordingly. 3651 if (Runtime::Current()->IsCompiler()) { 3652 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3653 } else { 3654 klass->SetStatus(mirror::Class::kStatusVerified, self); 3655 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3656 // later. 3657 klass->SetPreverified(); 3658 } 3659 } 3660 } else { 3661 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3662 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3663 << " because: " << error_msg; 3664 self->AssertNoPendingException(); 3665 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3666 klass->SetStatus(mirror::Class::kStatusError, self); 3667 } 3668 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3669 // Class is verified so we don't need to do any access check on its methods. 3670 // Let the interpreter know it by setting the kAccPreverified flag onto each 3671 // method. 3672 // Note: we're going here during compilation and at runtime. When we set the 3673 // kAccPreverified flag when compiling image classes, the flag is recorded 3674 // in the image and is set when loading the image. 3675 EnsurePreverifiedMethods(klass); 3676 } 3677} 3678 3679void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3680 if (!klass->IsPreverified()) { 3681 klass->SetPreverifiedFlagOnAllMethods(); 3682 klass->SetPreverified(); 3683 } 3684} 3685 3686bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3687 mirror::Class::Status& oat_file_class_status) { 3688 // If we're compiling, we can only verify the class using the oat file if 3689 // we are not compiling the image or if the class we're verifying is not part of 3690 // the app. In other words, we will only check for preverification of bootclasspath 3691 // classes. 3692 if (Runtime::Current()->IsCompiler()) { 3693 // Are we compiling the bootclasspath? 3694 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3695 return false; 3696 } 3697 // We are compiling an app (not the image). 3698 3699 // Is this an app class? (I.e. not a bootclasspath class) 3700 if (klass->GetClassLoader() != nullptr) { 3701 return false; 3702 } 3703 } 3704 3705 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3706 // In case we run without an image there won't be a backing oat file. 3707 if (oat_dex_file == nullptr) { 3708 return false; 3709 } 3710 3711 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3712 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3713 if (oat_file_class_status == mirror::Class::kStatusVerified || 3714 oat_file_class_status == mirror::Class::kStatusInitialized) { 3715 return true; 3716 } 3717 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3718 // Compile time verification failed with a soft error. Compile time verification can fail 3719 // because we have incomplete type information. Consider the following: 3720 // class ... { 3721 // Foo x; 3722 // .... () { 3723 // if (...) { 3724 // v1 gets assigned a type of resolved class Foo 3725 // } else { 3726 // v1 gets assigned a type of unresolved class Bar 3727 // } 3728 // iput x = v1 3729 // } } 3730 // when we merge v1 following the if-the-else it results in Conflict 3731 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3732 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3733 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3734 // at compile time). 3735 return false; 3736 } 3737 if (oat_file_class_status == mirror::Class::kStatusError) { 3738 // Compile time verification failed with a hard error. This is caused by invalid instructions 3739 // in the class. These errors are unrecoverable. 3740 return false; 3741 } 3742 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3743 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3744 // not loading the class. 3745 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3746 // isn't a problem and this case shouldn't occur 3747 return false; 3748 } 3749 std::string temp; 3750 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3751 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3752 << klass->GetDescriptor(&temp); 3753 UNREACHABLE(); 3754} 3755 3756void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3757 Handle<mirror::Class> klass) { 3758 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3759 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3760 } 3761 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3762 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3763 } 3764} 3765 3766void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3767 mirror::ArtMethod* method) { 3768 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3769 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3770 if (code_item == nullptr) { 3771 return; // native or abstract method 3772 } 3773 if (code_item->tries_size_ == 0) { 3774 return; // nothing to process 3775 } 3776 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3777 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3778 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3779 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3780 CatchHandlerIterator iterator(handlers_ptr); 3781 for (; iterator.HasNext(); iterator.Next()) { 3782 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3783 // unresolved exception types will be ignored by exception delivery 3784 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3785 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3786 if (exception_type == nullptr) { 3787 DCHECK(Thread::Current()->IsExceptionPending()); 3788 Thread::Current()->ClearException(); 3789 } 3790 } 3791 } 3792 handlers_ptr = iterator.EndDataPointer(); 3793 } 3794} 3795 3796static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3797static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3798 Handle<mirror::ArtMethod> prototype); 3799 3800mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3801 jobjectArray interfaces, jobject loader, 3802 jobjectArray methods, jobjectArray throws) { 3803 Thread* self = soa.Self(); 3804 StackHandleScope<8> hs(self); 3805 MutableHandle<mirror::Class> klass(hs.NewHandle( 3806 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3807 if (klass.Get() == nullptr) { 3808 CHECK(self->IsExceptionPending()); // OOME. 3809 return nullptr; 3810 } 3811 DCHECK(klass->GetClass() != nullptr); 3812 klass->SetObjectSize(sizeof(mirror::Proxy)); 3813 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3814 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3815 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3816 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3817 klass->SetName(soa.Decode<mirror::String*>(name)); 3818 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3819 klass->SetDexCache(proxy_class->GetDexCache()); 3820 klass->SetStatus(mirror::Class::kStatusIdx, self); 3821 3822 // Instance fields are inherited, but we add a couple of static fields... 3823 { 3824 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3825 if (UNLIKELY(sfields == nullptr)) { 3826 CHECK(self->IsExceptionPending()); // OOME. 3827 return nullptr; 3828 } 3829 klass->SetSFields(sfields); 3830 } 3831 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3832 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3833 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3834 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3835 CHECK(self->IsExceptionPending()); // OOME. 3836 return nullptr; 3837 } 3838 klass->SetStaticField(0, interfaces_sfield.Get()); 3839 interfaces_sfield->SetDexFieldIndex(0); 3840 interfaces_sfield->SetDeclaringClass(klass.Get()); 3841 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3842 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3843 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3844 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3845 CHECK(self->IsExceptionPending()); // OOME. 3846 return nullptr; 3847 } 3848 klass->SetStaticField(1, throws_sfield.Get()); 3849 throws_sfield->SetDexFieldIndex(1); 3850 throws_sfield->SetDeclaringClass(klass.Get()); 3851 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3852 3853 // Proxies have 1 direct method, the constructor 3854 { 3855 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3856 if (UNLIKELY(directs == nullptr)) { 3857 CHECK(self->IsExceptionPending()); // OOME. 3858 return nullptr; 3859 } 3860 klass->SetDirectMethods(directs); 3861 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3862 if (UNLIKELY(constructor == nullptr)) { 3863 CHECK(self->IsExceptionPending()); // OOME. 3864 return nullptr; 3865 } 3866 klass->SetDirectMethod(0, constructor); 3867 } 3868 3869 // Create virtual method using specified prototypes. 3870 size_t num_virtual_methods = 3871 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3872 { 3873 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3874 num_virtual_methods); 3875 if (UNLIKELY(virtuals == nullptr)) { 3876 CHECK(self->IsExceptionPending()); // OOME. 3877 return nullptr; 3878 } 3879 klass->SetVirtualMethods(virtuals); 3880 } 3881 for (size_t i = 0; i < num_virtual_methods; ++i) { 3882 StackHandleScope<1> hs2(self); 3883 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3884 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3885 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3886 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3887 if (UNLIKELY(clone == nullptr)) { 3888 CHECK(self->IsExceptionPending()); // OOME. 3889 return nullptr; 3890 } 3891 klass->SetVirtualMethod(i, clone); 3892 } 3893 3894 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3895 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3896 self->AssertNoPendingException(); 3897 3898 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3899 mirror::Class* new_class = nullptr; 3900 { 3901 // Must hold lock on object when resolved. 3902 ObjectLock<mirror::Class> resolution_lock(self, klass); 3903 // Link the fields and virtual methods, creating vtable and iftables 3904 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3905 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3906 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3907 klass->SetStatus(mirror::Class::kStatusError, self); 3908 return nullptr; 3909 } 3910 } 3911 3912 CHECK(klass->IsRetired()); 3913 CHECK_NE(klass.Get(), new_class); 3914 klass.Assign(new_class); 3915 3916 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3917 interfaces_sfield->SetObject<false>(klass.Get(), 3918 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3919 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3920 throws_sfield->SetObject<false>(klass.Get(), 3921 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3922 3923 { 3924 // Lock on klass is released. Lock new class object. 3925 ObjectLock<mirror::Class> initialization_lock(self, klass); 3926 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3927 } 3928 3929 // sanity checks 3930 if (kIsDebugBuild) { 3931 CHECK(klass->GetIFields() == nullptr); 3932 CheckProxyConstructor(klass->GetDirectMethod(0)); 3933 for (size_t i = 0; i < num_virtual_methods; ++i) { 3934 StackHandleScope<2> hs2(self); 3935 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3936 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3937 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3938 Handle<mirror::ArtMethod> virtual_method(hs2.NewHandle(klass->GetVirtualMethod(i))); 3939 CheckProxyMethod(virtual_method, prototype); 3940 } 3941 3942 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3943 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3944 decoded_name->ToModifiedUtf8().c_str())); 3945 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3946 3947 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3948 decoded_name->ToModifiedUtf8().c_str())); 3949 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3950 3951 CHECK_EQ(klass.Get()->GetInterfaces(), 3952 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3953 CHECK_EQ(klass.Get()->GetThrows(), 3954 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3955 } 3956 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3957 ComputeModifiedUtf8Hash(descriptor.c_str())); 3958 CHECK(existing == nullptr); 3959 return klass.Get(); 3960} 3961 3962std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3963 DCHECK(proxy_class->IsProxyClass()); 3964 mirror::String* name = proxy_class->GetName(); 3965 DCHECK(name != nullptr); 3966 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3967} 3968 3969mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3970 mirror::ArtMethod* proxy_method) { 3971 DCHECK(proxy_class->IsProxyClass()); 3972 DCHECK(proxy_method->IsProxyMethod()); 3973 // Locate the dex cache of the original interface/Object 3974 mirror::DexCache* dex_cache = nullptr; 3975 { 3976 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3977 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3978 mirror::DexCache* a_dex_cache = GetDexCache(i); 3979 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3980 dex_cache = a_dex_cache; 3981 break; 3982 } 3983 } 3984 } 3985 CHECK(dex_cache != nullptr); 3986 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3987 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3988 CHECK(resolved_method != nullptr); 3989 return resolved_method; 3990} 3991 3992 3993mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3994 Handle<mirror::Class> klass, 3995 mirror::Class* proxy_class) { 3996 // Create constructor for Proxy that must initialize h 3997 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3998 proxy_class->GetDirectMethods(); 3999 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 4000 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 4001 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 4002 // constructor method. 4003 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 4004 proxy_constructor); 4005 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 4006 // code_ too) 4007 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 4008 if (constructor == nullptr) { 4009 CHECK(self->IsExceptionPending()); // OOME. 4010 return nullptr; 4011 } 4012 // Make this constructor public and fix the class to be our Proxy version 4013 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 4014 constructor->SetDeclaringClass(klass.Get()); 4015 return constructor; 4016} 4017 4018static void CheckProxyConstructor(mirror::ArtMethod* constructor) 4019 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4020 CHECK(constructor->IsConstructor()); 4021 CHECK_STREQ(constructor->GetName(), "<init>"); 4022 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4023 "(Ljava/lang/reflect/InvocationHandler;)V"); 4024 DCHECK(constructor->IsPublic()); 4025} 4026 4027mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4028 Handle<mirror::Class> klass, 4029 Handle<mirror::ArtMethod> prototype) { 4030 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4031 // prototype method 4032 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4033 prototype.Get()); 4034 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4035 // as necessary 4036 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4037 if (UNLIKELY(method == nullptr)) { 4038 CHECK(self->IsExceptionPending()); // OOME. 4039 return nullptr; 4040 } 4041 4042 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4043 // the intersection of throw exceptions as defined in Proxy 4044 method->SetDeclaringClass(klass.Get()); 4045 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4046 4047 // At runtime the method looks like a reference and argument saving method, clone the code 4048 // related parameters from this method. 4049 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4050 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4051 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4052 4053 return method; 4054} 4055 4056static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4057 Handle<mirror::ArtMethod> prototype) 4058 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4059 // Basic sanity 4060 CHECK(!prototype->IsFinal()); 4061 CHECK(method->IsFinal()); 4062 CHECK(!method->IsAbstract()); 4063 4064 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4065 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4066 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4067 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4068 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4069 4070 CHECK_STREQ(method->GetName(), prototype->GetName()); 4071 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4072 // More complex sanity - via dex cache 4073 CHECK_EQ(method->GetInterfaceMethodIfProxy()->GetReturnType(), prototype->GetReturnType()); 4074} 4075 4076static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4077 bool can_init_parents) 4078 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4079 if (can_init_statics && can_init_parents) { 4080 return true; 4081 } 4082 if (!can_init_statics) { 4083 // Check if there's a class initializer. 4084 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4085 if (clinit != nullptr) { 4086 return false; 4087 } 4088 // Check if there are encoded static values needing initialization. 4089 if (klass->NumStaticFields() != 0) { 4090 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4091 DCHECK(dex_class_def != nullptr); 4092 if (dex_class_def->static_values_off_ != 0) { 4093 return false; 4094 } 4095 } 4096 } 4097 if (!klass->IsInterface() && klass->HasSuperClass()) { 4098 mirror::Class* super_class = klass->GetSuperClass(); 4099 if (!can_init_parents && !super_class->IsInitialized()) { 4100 return false; 4101 } else { 4102 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4103 return false; 4104 } 4105 } 4106 } 4107 return true; 4108} 4109 4110bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4111 bool can_init_statics, bool can_init_parents) { 4112 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4113 4114 // Are we already initialized and therefore done? 4115 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4116 // an initialized class will never change its state. 4117 if (klass->IsInitialized()) { 4118 return true; 4119 } 4120 4121 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4122 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4123 return false; 4124 } 4125 4126 self->AllowThreadSuspension(); 4127 uint64_t t0; 4128 { 4129 ObjectLock<mirror::Class> lock(self, klass); 4130 4131 // Re-check under the lock in case another thread initialized ahead of us. 4132 if (klass->IsInitialized()) { 4133 return true; 4134 } 4135 4136 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4137 if (klass->IsErroneous()) { 4138 ThrowEarlierClassFailure(klass.Get()); 4139 VlogClassInitializationFailure(klass); 4140 return false; 4141 } 4142 4143 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4144 4145 if (!klass->IsVerified()) { 4146 VerifyClass(self, klass); 4147 if (!klass->IsVerified()) { 4148 // We failed to verify, expect either the klass to be erroneous or verification failed at 4149 // compile time. 4150 if (klass->IsErroneous()) { 4151 CHECK(self->IsExceptionPending()); 4152 VlogClassInitializationFailure(klass); 4153 } else { 4154 CHECK(Runtime::Current()->IsCompiler()); 4155 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4156 } 4157 return false; 4158 } else { 4159 self->AssertNoPendingException(); 4160 } 4161 } 4162 4163 // If the class is kStatusInitializing, either this thread is 4164 // initializing higher up the stack or another thread has beat us 4165 // to initializing and we need to wait. Either way, this 4166 // invocation of InitializeClass will not be responsible for 4167 // running <clinit> and will return. 4168 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4169 // Could have got an exception during verification. 4170 if (self->IsExceptionPending()) { 4171 VlogClassInitializationFailure(klass); 4172 return false; 4173 } 4174 // We caught somebody else in the act; was it us? 4175 if (klass->GetClinitThreadId() == self->GetTid()) { 4176 // Yes. That's fine. Return so we can continue initializing. 4177 return true; 4178 } 4179 // No. That's fine. Wait for another thread to finish initializing. 4180 return WaitForInitializeClass(klass, self, lock); 4181 } 4182 4183 if (!ValidateSuperClassDescriptors(klass)) { 4184 klass->SetStatus(mirror::Class::kStatusError, self); 4185 return false; 4186 } 4187 self->AllowThreadSuspension(); 4188 4189 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4190 4191 // From here out other threads may observe that we're initializing and so changes of state 4192 // require the a notification. 4193 klass->SetClinitThreadId(self->GetTid()); 4194 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4195 4196 t0 = NanoTime(); 4197 } 4198 4199 // Initialize super classes, must be done while initializing for the JLS. 4200 if (!klass->IsInterface() && klass->HasSuperClass()) { 4201 mirror::Class* super_class = klass->GetSuperClass(); 4202 if (!super_class->IsInitialized()) { 4203 CHECK(!super_class->IsInterface()); 4204 CHECK(can_init_parents); 4205 StackHandleScope<1> hs(self); 4206 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4207 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4208 if (!super_initialized) { 4209 // The super class was verified ahead of entering initializing, we should only be here if 4210 // the super class became erroneous due to initialization. 4211 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4212 << "Super class initialization failed for " 4213 << PrettyDescriptor(handle_scope_super.Get()) 4214 << " that has unexpected status " << handle_scope_super->GetStatus() 4215 << "\nPending exception:\n" 4216 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4217 ObjectLock<mirror::Class> lock(self, klass); 4218 // Initialization failed because the super-class is erroneous. 4219 klass->SetStatus(mirror::Class::kStatusError, self); 4220 return false; 4221 } 4222 } 4223 } 4224 4225 const size_t num_static_fields = klass->NumStaticFields(); 4226 if (num_static_fields > 0) { 4227 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4228 CHECK(dex_class_def != nullptr); 4229 const DexFile& dex_file = klass->GetDexFile(); 4230 StackHandleScope<3> hs(self); 4231 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4232 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4233 4234 // Eagerly fill in static fields so that the we don't have to do as many expensive 4235 // Class::FindStaticField in ResolveField. 4236 for (size_t i = 0; i < num_static_fields; ++i) { 4237 mirror::ArtField* field = klass->GetStaticField(i); 4238 const uint32_t field_idx = field->GetDexFieldIndex(); 4239 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 4240 if (resolved_field == nullptr) { 4241 dex_cache->SetResolvedField(field_idx, field); 4242 } else { 4243 DCHECK_EQ(field, resolved_field); 4244 } 4245 } 4246 4247 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4248 this, *dex_class_def); 4249 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4250 ClassDataItemIterator field_it(dex_file, class_data); 4251 if (value_it.HasNext()) { 4252 DCHECK(field_it.HasNextStaticField()); 4253 CHECK(can_init_statics); 4254 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4255 StackHandleScope<1> hs2(self); 4256 Handle<mirror::ArtField> field(hs2.NewHandle( 4257 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4258 if (Runtime::Current()->IsActiveTransaction()) { 4259 value_it.ReadValueToField<true>(field); 4260 } else { 4261 value_it.ReadValueToField<false>(field); 4262 } 4263 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4264 } 4265 } 4266 } 4267 4268 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4269 if (clinit != nullptr) { 4270 CHECK(can_init_statics); 4271 JValue result; 4272 clinit->Invoke(self, nullptr, 0, &result, "V"); 4273 } 4274 4275 self->AllowThreadSuspension(); 4276 uint64_t t1 = NanoTime(); 4277 4278 bool success = true; 4279 { 4280 ObjectLock<mirror::Class> lock(self, klass); 4281 4282 if (self->IsExceptionPending()) { 4283 WrapExceptionInInitializer(klass); 4284 klass->SetStatus(mirror::Class::kStatusError, self); 4285 success = false; 4286 } else { 4287 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4288 RuntimeStats* thread_stats = self->GetStats(); 4289 ++global_stats->class_init_count; 4290 ++thread_stats->class_init_count; 4291 global_stats->class_init_time_ns += (t1 - t0); 4292 thread_stats->class_init_time_ns += (t1 - t0); 4293 // Set the class as initialized except if failed to initialize static fields. 4294 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4295 if (VLOG_IS_ON(class_linker)) { 4296 std::string temp; 4297 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4298 klass->GetLocation(); 4299 } 4300 // Opportunistically set static method trampolines to their destination. 4301 FixupStaticTrampolines(klass.Get()); 4302 } 4303 } 4304 return success; 4305} 4306 4307bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4308 ObjectLock<mirror::Class>& lock) 4309 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4310 while (true) { 4311 self->AssertNoPendingException(); 4312 CHECK(!klass->IsInitialized()); 4313 lock.WaitIgnoringInterrupts(); 4314 4315 // When we wake up, repeat the test for init-in-progress. If 4316 // there's an exception pending (only possible if 4317 // we were not using WaitIgnoringInterrupts), bail out. 4318 if (self->IsExceptionPending()) { 4319 WrapExceptionInInitializer(klass); 4320 klass->SetStatus(mirror::Class::kStatusError, self); 4321 return false; 4322 } 4323 // Spurious wakeup? Go back to waiting. 4324 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4325 continue; 4326 } 4327 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4328 // Compile time initialization failed. 4329 return false; 4330 } 4331 if (klass->IsErroneous()) { 4332 // The caller wants an exception, but it was thrown in a 4333 // different thread. Synthesize one here. 4334 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4335 PrettyDescriptor(klass.Get()).c_str()); 4336 VlogClassInitializationFailure(klass); 4337 return false; 4338 } 4339 if (klass->IsInitialized()) { 4340 return true; 4341 } 4342 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4343 << klass->GetStatus(); 4344 } 4345 UNREACHABLE(); 4346} 4347 4348static bool HasSameSignatureWithDifferentClassLoaders(Thread* self, 4349 Handle<mirror::ArtMethod> method1, 4350 Handle<mirror::ArtMethod> method2) 4351 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4352 { 4353 StackHandleScope<1> hs(self); 4354 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType())); 4355 if (UNLIKELY(method2->GetReturnType() != return_type.Get())) { 4356 return false; 4357 } 4358 } 4359 const DexFile::TypeList* types1 = method1->GetParameterTypeList(); 4360 const DexFile::TypeList* types2 = method2->GetParameterTypeList(); 4361 if (types1 == nullptr) { 4362 return (types2 == nullptr) || (types2->Size() == 0); 4363 } else if (UNLIKELY(types2 == nullptr)) { 4364 return types1->Size() == 0; 4365 } 4366 uint32_t num_types = types1->Size(); 4367 if (UNLIKELY(num_types != types2->Size())) { 4368 return false; 4369 } 4370 for (uint32_t i = 0; i < num_types; ++i) { 4371 mirror::Class* param_type = 4372 method1->GetClassFromTypeIndex(types1->GetTypeItem(i).type_idx_, true); 4373 mirror::Class* other_param_type = 4374 method2->GetClassFromTypeIndex(types2->GetTypeItem(i).type_idx_, true); 4375 if (UNLIKELY(param_type != other_param_type)) { 4376 return false; 4377 } 4378 } 4379 return true; 4380} 4381 4382 4383bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4384 if (klass->IsInterface()) { 4385 return true; 4386 } 4387 // Begin with the methods local to the superclass. 4388 Thread* self = Thread::Current(); 4389 StackHandleScope<2> hs(self); 4390 MutableHandle<mirror::ArtMethod> h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4391 MutableHandle<mirror::ArtMethod> super_h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4392 if (klass->HasSuperClass() && 4393 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4394 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4395 h_m.Assign(klass->GetVTableEntry(i)); 4396 super_h_m.Assign(klass->GetSuperClass()->GetVTableEntry(i)); 4397 if (h_m.Get() != super_h_m.Get() && 4398 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4399 ThrowLinkageError(klass.Get(), 4400 "Class %s method %s resolves differently in superclass %s", 4401 PrettyDescriptor(klass.Get()).c_str(), 4402 PrettyMethod(h_m.Get()).c_str(), 4403 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4404 return false; 4405 } 4406 } 4407 } 4408 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4409 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4410 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4411 for (uint32_t j = 0; j < num_methods; ++j) { 4412 h_m.Assign(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4413 super_h_m.Assign(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4414 if (h_m.Get() != super_h_m.Get() && 4415 !HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m)) { 4416 ThrowLinkageError(klass.Get(), 4417 "Class %s method %s resolves differently in interface %s", 4418 PrettyDescriptor(klass.Get()).c_str(), 4419 PrettyMethod(h_m.Get()).c_str(), 4420 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4421 return false; 4422 } 4423 } 4424 } 4425 } 4426 return true; 4427} 4428 4429bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4430 bool can_init_parents) { 4431 DCHECK(c.Get() != nullptr); 4432 if (c->IsInitialized()) { 4433 EnsurePreverifiedMethods(c); 4434 return true; 4435 } 4436 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4437 if (!success) { 4438 if (can_init_fields && can_init_parents) { 4439 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4440 } 4441 } else { 4442 self->AssertNoPendingException(); 4443 } 4444 return success; 4445} 4446 4447void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4448 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4449 if (fields != nullptr) { 4450 for (int index = 0; index < fields->GetLength(); index ++) { 4451 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4452 fields->Get(index)->SetDeclaringClass(new_class); 4453 } 4454 } 4455 } 4456 4457 fields = new_class->GetSFields(); 4458 if (fields != nullptr) { 4459 for (int index = 0; index < fields->GetLength(); index ++) { 4460 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4461 fields->Get(index)->SetDeclaringClass(new_class); 4462 } 4463 } 4464 } 4465 4466 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4467 if (methods != nullptr) { 4468 for (int index = 0; index < methods->GetLength(); index ++) { 4469 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4470 methods->Get(index)->SetDeclaringClass(new_class); 4471 } 4472 } 4473 } 4474 4475 methods = new_class->GetVirtualMethods(); 4476 if (methods != nullptr) { 4477 for (int index = 0; index < methods->GetLength(); index ++) { 4478 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4479 methods->Get(index)->SetDeclaringClass(new_class); 4480 } 4481 } 4482 } 4483} 4484 4485bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4486 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4487 mirror::Class** new_class) { 4488 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4489 4490 if (!LinkSuperClass(klass)) { 4491 return false; 4492 } 4493 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4494 self, Runtime::Current()->GetImtUnimplementedMethod()); 4495 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4496 return false; 4497 } 4498 if (!LinkInstanceFields(self, klass)) { 4499 return false; 4500 } 4501 size_t class_size; 4502 if (!LinkStaticFields(self, klass, &class_size)) { 4503 return false; 4504 } 4505 CreateReferenceInstanceOffsets(klass); 4506 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4507 4508 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4509 // We don't need to retire this class as it has no embedded tables or it was created the 4510 // correct size during class linker initialization. 4511 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4512 4513 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4514 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4515 } 4516 4517 // This will notify waiters on klass that saw the not yet resolved 4518 // class in the class_table_ during EnsureResolved. 4519 klass->SetStatus(mirror::Class::kStatusResolved, self); 4520 *new_class = klass.Get(); 4521 } else { 4522 CHECK(!klass->IsResolved()); 4523 // Retire the temporary class and create the correctly sized resolved class. 4524 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4525 if (UNLIKELY(*new_class == nullptr)) { 4526 CHECK(self->IsExceptionPending()); // Expect an OOME. 4527 klass->SetStatus(mirror::Class::kStatusError, self); 4528 return false; 4529 } 4530 4531 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4532 StackHandleScope<1> hs(self); 4533 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4534 ObjectLock<mirror::Class> lock(self, new_class_h); 4535 4536 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4537 4538 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 4539 ComputeModifiedUtf8Hash(descriptor)); 4540 CHECK(existing == nullptr || existing == klass.Get()); 4541 4542 // This will notify waiters on temp class that saw the not yet resolved class in the 4543 // class_table_ during EnsureResolved. 4544 klass->SetStatus(mirror::Class::kStatusRetired, self); 4545 4546 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4547 // This will notify waiters on new_class that saw the not yet resolved 4548 // class in the class_table_ during EnsureResolved. 4549 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4550 } 4551 return true; 4552} 4553 4554bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4555 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4556 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4557 uint16_t super_class_idx = class_def.superclass_idx_; 4558 if (super_class_idx != DexFile::kDexNoIndex16) { 4559 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4560 if (super_class == nullptr) { 4561 DCHECK(Thread::Current()->IsExceptionPending()); 4562 return false; 4563 } 4564 // Verify 4565 if (!klass->CanAccess(super_class)) { 4566 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4567 PrettyDescriptor(super_class).c_str(), 4568 PrettyDescriptor(klass.Get()).c_str()); 4569 return false; 4570 } 4571 CHECK(super_class->IsResolved()); 4572 klass->SetSuperClass(super_class); 4573 } 4574 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4575 if (interfaces != nullptr) { 4576 for (size_t i = 0; i < interfaces->Size(); i++) { 4577 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4578 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4579 if (interface == nullptr) { 4580 DCHECK(Thread::Current()->IsExceptionPending()); 4581 return false; 4582 } 4583 // Verify 4584 if (!klass->CanAccess(interface)) { 4585 // TODO: the RI seemed to ignore this in my testing. 4586 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4587 PrettyDescriptor(interface).c_str(), 4588 PrettyDescriptor(klass.Get()).c_str()); 4589 return false; 4590 } 4591 } 4592 } 4593 // Mark the class as loaded. 4594 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4595 return true; 4596} 4597 4598bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4599 CHECK(!klass->IsPrimitive()); 4600 mirror::Class* super = klass->GetSuperClass(); 4601 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4602 if (super != nullptr) { 4603 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4604 return false; 4605 } 4606 return true; 4607 } 4608 if (super == nullptr) { 4609 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4610 PrettyDescriptor(klass.Get()).c_str()); 4611 return false; 4612 } 4613 // Verify 4614 if (super->IsFinal() || super->IsInterface()) { 4615 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4616 PrettyDescriptor(super).c_str(), 4617 PrettyDescriptor(klass.Get()).c_str(), 4618 super->IsFinal() ? "declared final" : "an interface"); 4619 return false; 4620 } 4621 if (!klass->CanAccess(super)) { 4622 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4623 PrettyDescriptor(super).c_str(), 4624 PrettyDescriptor(klass.Get()).c_str()); 4625 return false; 4626 } 4627 4628 // Inherit kAccClassIsFinalizable from the superclass in case this 4629 // class doesn't override finalize. 4630 if (super->IsFinalizable()) { 4631 klass->SetFinalizable(); 4632 } 4633 4634 // Inherit reference flags (if any) from the superclass. 4635 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4636 if (reference_flags != 0) { 4637 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4638 } 4639 // Disallow custom direct subclasses of java.lang.ref.Reference. 4640 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4641 ThrowLinkageError(klass.Get(), 4642 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4643 PrettyDescriptor(klass.Get()).c_str()); 4644 return false; 4645 } 4646 4647 if (kIsDebugBuild) { 4648 // Ensure super classes are fully resolved prior to resolving fields.. 4649 while (super != nullptr) { 4650 CHECK(super->IsResolved()); 4651 super = super->GetSuperClass(); 4652 } 4653 } 4654 return true; 4655} 4656 4657// Populate the class vtable and itable. Compute return type indices. 4658bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4659 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4660 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4661 self->AllowThreadSuspension(); 4662 if (klass->IsInterface()) { 4663 // No vtable. 4664 size_t count = klass->NumVirtualMethods(); 4665 if (!IsUint(16, count)) { 4666 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4667 return false; 4668 } 4669 for (size_t i = 0; i < count; ++i) { 4670 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4671 } 4672 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4673 return false; 4674 } 4675 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4676} 4677 4678// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4679// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4680// caches in the implementation below. 4681class MethodNameAndSignatureComparator FINAL : public ValueObject { 4682 public: 4683 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4684 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4685 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4686 name_(nullptr), name_len_(0) { 4687 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4688 } 4689 4690 const char* GetName() { 4691 if (name_ == nullptr) { 4692 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4693 } 4694 return name_; 4695 } 4696 4697 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4698 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4699 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4700 const DexFile* other_dex_file = other->GetDexFile(); 4701 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4702 if (dex_file_ == other_dex_file) { 4703 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4704 } 4705 GetName(); // Only used to make sure its calculated. 4706 uint32_t other_name_len; 4707 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4708 &other_name_len); 4709 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4710 return false; 4711 } 4712 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4713 } 4714 4715 private: 4716 // Dex file for the method to compare against. 4717 const DexFile* const dex_file_; 4718 // MethodId for the method to compare against. 4719 const DexFile::MethodId* const mid_; 4720 // Lazily computed name from the dex file's strings. 4721 const char* name_; 4722 // Lazily computed name length. 4723 uint32_t name_len_; 4724}; 4725 4726class LinkVirtualHashTable { 4727 public: 4728 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4729 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4730 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4731 } 4732 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4733 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4734 const char* name = local_method->GetName(); 4735 uint32_t hash = ComputeModifiedUtf8Hash(name); 4736 uint32_t index = hash % hash_size_; 4737 // Linear probe until we have an empty slot. 4738 while (hash_table_[index] != invalid_index_) { 4739 if (++index == hash_size_) { 4740 index = 0; 4741 } 4742 } 4743 hash_table_[index] = virtual_method_index; 4744 } 4745 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4746 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4747 const char* name = comparator->GetName(); 4748 uint32_t hash = ComputeModifiedUtf8Hash(name); 4749 size_t index = hash % hash_size_; 4750 while (true) { 4751 const uint32_t value = hash_table_[index]; 4752 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4753 // the block and can safely assume not found. 4754 if (value == invalid_index_) { 4755 break; 4756 } 4757 if (value != removed_index_) { // This signifies not already overriden. 4758 mirror::ArtMethod* virtual_method = 4759 klass_->GetVirtualMethodDuringLinking(value); 4760 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4761 hash_table_[index] = removed_index_; 4762 return value; 4763 } 4764 } 4765 if (++index == hash_size_) { 4766 index = 0; 4767 } 4768 } 4769 return GetNotFoundIndex(); 4770 } 4771 static uint32_t GetNotFoundIndex() { 4772 return invalid_index_; 4773 } 4774 4775 private: 4776 static const uint32_t invalid_index_; 4777 static const uint32_t removed_index_; 4778 4779 Handle<mirror::Class> klass_; 4780 const size_t hash_size_; 4781 uint32_t* const hash_table_; 4782}; 4783 4784const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4785const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4786 4787bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4788 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4789 if (klass->HasSuperClass()) { 4790 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4791 const size_t max_count = num_virtual_methods + super_vtable_length; 4792 StackHandleScope<2> hs(self); 4793 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4794 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4795 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4796 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4797 if (UNLIKELY(vtable.Get() == nullptr)) { 4798 CHECK(self->IsExceptionPending()); // OOME. 4799 return false; 4800 } 4801 for (size_t i = 0; i < super_vtable_length; i++) { 4802 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4803 } 4804 if (num_virtual_methods == 0) { 4805 klass->SetVTable(vtable.Get()); 4806 return true; 4807 } 4808 } else { 4809 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4810 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4811 if (num_virtual_methods == 0) { 4812 klass->SetVTable(super_vtable); 4813 return true; 4814 } 4815 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4816 if (UNLIKELY(vtable.Get() == nullptr)) { 4817 CHECK(self->IsExceptionPending()); // OOME. 4818 return false; 4819 } 4820 } 4821 // How the algorithm works: 4822 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4823 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4824 // method which has not been matched to a vtable method, and j if the virtual method at the 4825 // index overrode the super virtual method at index j. 4826 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4827 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4828 // the need for the initial vtable which we later shrink back down). 4829 // 3. Add non overridden methods to the end of the vtable. 4830 static constexpr size_t kMaxStackHash = 250; 4831 const size_t hash_table_size = num_virtual_methods * 3; 4832 uint32_t* hash_table_ptr; 4833 std::unique_ptr<uint32_t[]> hash_heap_storage; 4834 if (hash_table_size <= kMaxStackHash) { 4835 hash_table_ptr = reinterpret_cast<uint32_t*>( 4836 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4837 } else { 4838 hash_heap_storage.reset(new uint32_t[hash_table_size]); 4839 hash_table_ptr = hash_heap_storage.get(); 4840 } 4841 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 4842 // Add virtual methods to the hash table. 4843 for (size_t i = 0; i < num_virtual_methods; ++i) { 4844 hash_table.Add(i); 4845 } 4846 // Loop through each super vtable method and see if they are overriden by a method we added to 4847 // the hash table. 4848 for (size_t j = 0; j < super_vtable_length; ++j) { 4849 // Search the hash table to see if we are overidden by any method. 4850 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4851 MethodNameAndSignatureComparator super_method_name_comparator( 4852 super_method->GetInterfaceMethodIfProxy()); 4853 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 4854 if (hash_index != hash_table.GetNotFoundIndex()) { 4855 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 4856 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4857 super_method->GetAccessFlags())) { 4858 if (super_method->IsFinal()) { 4859 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4860 PrettyMethod(virtual_method).c_str(), 4861 super_method->GetDeclaringClassDescriptor()); 4862 return false; 4863 } 4864 vtable->SetWithoutChecks<false>(j, virtual_method); 4865 virtual_method->SetMethodIndex(j); 4866 } else { 4867 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 4868 << " would have incorrectly overridden the package-private method in " 4869 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4870 } 4871 } 4872 } 4873 // Add the non overridden methods at the end. 4874 size_t actual_count = super_vtable_length; 4875 for (size_t i = 0; i < num_virtual_methods; ++i) { 4876 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4877 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 4878 if (method_idx < super_vtable_length && 4879 local_method == vtable->GetWithoutChecks(method_idx)) { 4880 continue; 4881 } 4882 vtable->SetWithoutChecks<false>(actual_count, local_method); 4883 local_method->SetMethodIndex(actual_count); 4884 ++actual_count; 4885 } 4886 if (!IsUint(16, actual_count)) { 4887 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4888 return false; 4889 } 4890 // Shrink vtable if possible 4891 CHECK_LE(actual_count, max_count); 4892 if (actual_count < max_count) { 4893 vtable.Assign(vtable->CopyOf(self, actual_count)); 4894 if (UNLIKELY(vtable.Get() == nullptr)) { 4895 CHECK(self->IsExceptionPending()); // OOME. 4896 return false; 4897 } 4898 } 4899 klass->SetVTable(vtable.Get()); 4900 } else { 4901 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4902 if (!IsUint(16, num_virtual_methods)) { 4903 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 4904 static_cast<int>(num_virtual_methods)); 4905 return false; 4906 } 4907 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 4908 if (UNLIKELY(vtable == nullptr)) { 4909 CHECK(self->IsExceptionPending()); // OOME. 4910 return false; 4911 } 4912 for (size_t i = 0; i < num_virtual_methods; ++i) { 4913 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4914 vtable->SetWithoutChecks<false>(i, virtual_method); 4915 virtual_method->SetMethodIndex(i & 0xFFFF); 4916 } 4917 klass->SetVTable(vtable); 4918 } 4919 return true; 4920} 4921 4922bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 4923 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4924 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4925 StackHandleScope<3> hs(self); 4926 Runtime* const runtime = Runtime::Current(); 4927 const bool has_superclass = klass->HasSuperClass(); 4928 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 4929 const bool have_interfaces = interfaces.Get() != nullptr; 4930 const size_t num_interfaces = 4931 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 4932 if (num_interfaces == 0) { 4933 if (super_ifcount == 0) { 4934 // Class implements no interfaces. 4935 DCHECK_EQ(klass->GetIfTableCount(), 0); 4936 DCHECK(klass->GetIfTable() == nullptr); 4937 return true; 4938 } 4939 // Class implements same interfaces as parent, are any of these not marker interfaces? 4940 bool has_non_marker_interface = false; 4941 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4942 for (size_t i = 0; i < super_ifcount; ++i) { 4943 if (super_iftable->GetMethodArrayCount(i) > 0) { 4944 has_non_marker_interface = true; 4945 break; 4946 } 4947 } 4948 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4949 if (!has_non_marker_interface) { 4950 klass->SetIfTable(super_iftable); 4951 return true; 4952 } 4953 } 4954 size_t ifcount = super_ifcount + num_interfaces; 4955 for (size_t i = 0; i < num_interfaces; i++) { 4956 mirror::Class* interface = have_interfaces ? 4957 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 4958 DCHECK(interface != nullptr); 4959 if (UNLIKELY(!interface->IsInterface())) { 4960 std::string temp; 4961 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4962 PrettyDescriptor(klass.Get()).c_str(), 4963 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4964 return false; 4965 } 4966 ifcount += interface->GetIfTableCount(); 4967 } 4968 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4969 if (UNLIKELY(iftable.Get() == nullptr)) { 4970 CHECK(self->IsExceptionPending()); // OOME. 4971 return false; 4972 } 4973 if (super_ifcount != 0) { 4974 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4975 for (size_t i = 0; i < super_ifcount; i++) { 4976 mirror::Class* super_interface = super_iftable->GetInterface(i); 4977 iftable->SetInterface(i, super_interface); 4978 } 4979 } 4980 self->AllowThreadSuspension(); 4981 // Flatten the interface inheritance hierarchy. 4982 size_t idx = super_ifcount; 4983 for (size_t i = 0; i < num_interfaces; i++) { 4984 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 4985 mirror::Class::GetDirectInterface(self, klass, i); 4986 // Check if interface is already in iftable 4987 bool duplicate = false; 4988 for (size_t j = 0; j < idx; j++) { 4989 mirror::Class* existing_interface = iftable->GetInterface(j); 4990 if (existing_interface == interface) { 4991 duplicate = true; 4992 break; 4993 } 4994 } 4995 if (!duplicate) { 4996 // Add this non-duplicate interface. 4997 iftable->SetInterface(idx++, interface); 4998 // Add this interface's non-duplicate super-interfaces. 4999 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 5000 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 5001 bool super_duplicate = false; 5002 for (size_t k = 0; k < idx; k++) { 5003 mirror::Class* existing_interface = iftable->GetInterface(k); 5004 if (existing_interface == super_interface) { 5005 super_duplicate = true; 5006 break; 5007 } 5008 } 5009 if (!super_duplicate) { 5010 iftable->SetInterface(idx++, super_interface); 5011 } 5012 } 5013 } 5014 } 5015 self->AllowThreadSuspension(); 5016 // Shrink iftable in case duplicates were found 5017 if (idx < ifcount) { 5018 DCHECK_NE(num_interfaces, 0U); 5019 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 5020 if (UNLIKELY(iftable.Get() == nullptr)) { 5021 CHECK(self->IsExceptionPending()); // OOME. 5022 return false; 5023 } 5024 ifcount = idx; 5025 } else { 5026 DCHECK_EQ(idx, ifcount); 5027 } 5028 klass->SetIfTable(iftable.Get()); 5029 // If we're an interface, we don't need the vtable pointers, so we're done. 5030 if (klass->IsInterface()) { 5031 return true; 5032 } 5033 size_t miranda_list_size = 0; 5034 size_t max_miranda_methods = 0; // The max size of miranda_list. 5035 for (size_t i = 0; i < ifcount; ++i) { 5036 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 5037 } 5038 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 5039 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 5040 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 5041 hs.NewHandle(klass->GetVTableDuringLinking())); 5042 // Copy the IMT from the super class if possible. 5043 bool extend_super_iftable = false; 5044 if (has_superclass) { 5045 mirror::Class* super_class = klass->GetSuperClass(); 5046 extend_super_iftable = true; 5047 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 5048 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 5049 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 5050 } 5051 } else { 5052 // No imt in the super class, need to reconstruct from the iftable. 5053 mirror::IfTable* if_table = super_class->GetIfTable(); 5054 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5055 const size_t length = super_class->GetIfTableCount(); 5056 for (size_t i = 0; i < length; ++i) { 5057 mirror::Class* interface = iftable->GetInterface(i); 5058 const size_t num_virtuals = interface->NumVirtualMethods(); 5059 const size_t method_array_count = if_table->GetMethodArrayCount(i); 5060 DCHECK_EQ(num_virtuals, method_array_count); 5061 if (method_array_count == 0) { 5062 continue; 5063 } 5064 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 5065 for (size_t j = 0; j < num_virtuals; ++j) { 5066 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 5067 if (method->IsMiranda()) { 5068 continue; 5069 } 5070 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 5071 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5072 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5073 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5074 out_imt->SetReference(imt_index, method); 5075 } else if (imt_ref != conflict_method) { 5076 out_imt->SetReference(imt_index, conflict_method); 5077 } 5078 } 5079 } 5080 } 5081 } 5082 for (size_t i = 0; i < ifcount; ++i) { 5083 self->AllowThreadSuspension(); 5084 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 5085 if (num_methods > 0) { 5086 StackHandleScope<2> hs2(self); 5087 const bool is_super = i < super_ifcount; 5088 const bool super_interface = is_super && extend_super_iftable; 5089 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 5090 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 5091 if (super_interface) { 5092 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 5093 DCHECK(if_table != nullptr); 5094 DCHECK(if_table->GetMethodArray(i) != nullptr); 5095 // If we are working on a super interface, try extending the existing method array. 5096 method_array = hs2.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 5097 AsObjectArray<mirror::ArtMethod>()); 5098 // We are overwriting a super class interface, try to only virtual methods instead of the 5099 // whole vtable. 5100 input_array = hs2.NewHandle(klass->GetVirtualMethods()); 5101 } else { 5102 method_array = hs2.NewHandle(AllocArtMethodArray(self, num_methods)); 5103 // A new interface, we need the whole vtable incase a new interface method is implemented 5104 // in the whole superclass. 5105 input_array = vtable; 5106 } 5107 if (UNLIKELY(method_array.Get() == nullptr)) { 5108 CHECK(self->IsExceptionPending()); // OOME. 5109 return false; 5110 } 5111 iftable->SetMethodArray(i, method_array.Get()); 5112 if (input_array.Get() == nullptr) { 5113 // If the added virtual methods is empty, do nothing. 5114 DCHECK(super_interface); 5115 continue; 5116 } 5117 for (size_t j = 0; j < num_methods; ++j) { 5118 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 5119 MethodNameAndSignatureComparator interface_name_comparator( 5120 interface_method->GetInterfaceMethodIfProxy()); 5121 int32_t k; 5122 // For each method listed in the interface's method list, find the 5123 // matching method in our class's method list. We want to favor the 5124 // subclass over the superclass, which just requires walking 5125 // back from the end of the vtable. (This only matters if the 5126 // superclass defines a private method and this class redefines 5127 // it -- otherwise it would use the same vtable slot. In .dex files 5128 // those don't end up in the virtual method table, so it shouldn't 5129 // matter which direction we go. We walk it backward anyway.) 5130 for (k = input_array->GetLength() - 1; k >= 0; --k) { 5131 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 5132 mirror::ArtMethod* vtable_method_for_name_comparison = 5133 vtable_method->GetInterfaceMethodIfProxy(); 5134 if (interface_name_comparator.HasSameNameAndSignature( 5135 vtable_method_for_name_comparison)) { 5136 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 5137 ThrowIllegalAccessError( 5138 klass.Get(), 5139 "Method '%s' implementing interface method '%s' is not public", 5140 PrettyMethod(vtable_method).c_str(), 5141 PrettyMethod(interface_method).c_str()); 5142 return false; 5143 } 5144 method_array->SetWithoutChecks<false>(j, vtable_method); 5145 // Place method in imt if entry is empty, place conflict otherwise. 5146 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5147 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5148 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5149 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5150 out_imt->SetReference(imt_index, vtable_method); 5151 } else if (imt_ref != conflict_method) { 5152 // If we are not a conflict and we have the same signature and name as the imt entry, 5153 // it must be that we overwrote a superclass vtable entry. 5154 MethodNameAndSignatureComparator imt_ref_name_comparator( 5155 imt_ref->GetInterfaceMethodIfProxy()); 5156 if (imt_ref_name_comparator.HasSameNameAndSignature( 5157 vtable_method_for_name_comparison)) { 5158 out_imt->SetReference(imt_index, vtable_method); 5159 } else { 5160 out_imt->SetReference(imt_index, conflict_method); 5161 } 5162 } 5163 break; 5164 } 5165 } 5166 if (k < 0 && !super_interface) { 5167 mirror::ArtMethod* miranda_method = nullptr; 5168 for (size_t l = 0; l < miranda_list_size; ++l) { 5169 mirror::ArtMethod* mir_method = miranda_list->Get(l); 5170 if (interface_name_comparator.HasSameNameAndSignature(mir_method)) { 5171 miranda_method = mir_method; 5172 break; 5173 } 5174 } 5175 if (miranda_method == nullptr) { 5176 // Point the interface table at a phantom slot. 5177 miranda_method = interface_method->Clone(self)->AsArtMethod(); 5178 if (UNLIKELY(miranda_method == nullptr)) { 5179 CHECK(self->IsExceptionPending()); // OOME. 5180 return false; 5181 } 5182 DCHECK_LT(miranda_list_size, max_miranda_methods); 5183 miranda_list->Set<false>(miranda_list_size++, miranda_method); 5184 } 5185 method_array->SetWithoutChecks<false>(j, miranda_method); 5186 } 5187 } 5188 } 5189 } 5190 if (miranda_list_size > 0) { 5191 int old_method_count = klass->NumVirtualMethods(); 5192 int new_method_count = old_method_count + miranda_list_size; 5193 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 5194 if (old_method_count == 0) { 5195 virtuals = AllocArtMethodArray(self, new_method_count); 5196 } else { 5197 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 5198 } 5199 if (UNLIKELY(virtuals == nullptr)) { 5200 CHECK(self->IsExceptionPending()); // OOME. 5201 return false; 5202 } 5203 klass->SetVirtualMethods(virtuals); 5204 5205 int old_vtable_count = vtable->GetLength(); 5206 int new_vtable_count = old_vtable_count + miranda_list_size; 5207 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 5208 if (UNLIKELY(vtable.Get() == nullptr)) { 5209 CHECK(self->IsExceptionPending()); // OOME. 5210 return false; 5211 } 5212 for (size_t i = 0; i < miranda_list_size; ++i) { 5213 mirror::ArtMethod* method = miranda_list->Get(i); 5214 // Leave the declaring class alone as type indices are relative to it 5215 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5216 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5217 klass->SetVirtualMethod(old_method_count + i, method); 5218 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5219 } 5220 // TODO: do not assign to the vtable field until it is fully constructed. 5221 klass->SetVTable(vtable.Get()); 5222 } 5223 5224 if (kIsDebugBuild) { 5225 mirror::ObjectArray<mirror::ArtMethod>* check_vtable = klass->GetVTableDuringLinking(); 5226 for (int i = 0; i < check_vtable->GetLength(); ++i) { 5227 CHECK(check_vtable->GetWithoutChecks(i) != nullptr); 5228 } 5229 } 5230 5231 self->AllowThreadSuspension(); 5232 return true; 5233} 5234 5235bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5236 CHECK(klass.Get() != nullptr); 5237 return LinkFields(self, klass, false, nullptr); 5238} 5239 5240bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5241 CHECK(klass.Get() != nullptr); 5242 return LinkFields(self, klass, true, class_size); 5243} 5244 5245struct LinkFieldsComparator { 5246 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5247 } 5248 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5249 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5250 NO_THREAD_SAFETY_ANALYSIS { 5251 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5252 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5253 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5254 if (type1 != type2) { 5255 if (type1 == Primitive::kPrimNot) { 5256 // Reference always goes first. 5257 return true; 5258 } 5259 if (type2 == Primitive::kPrimNot) { 5260 // Reference always goes first. 5261 return false; 5262 } 5263 size_t size1 = Primitive::ComponentSize(type1); 5264 size_t size2 = Primitive::ComponentSize(type2); 5265 if (size1 != size2) { 5266 // Larger primitive types go first. 5267 return size1 > size2; 5268 } 5269 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 5270 return type1 < type2; 5271 } 5272 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 5273 // by name and for equal names by type id index. 5274 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 5275 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 5276 } 5277}; 5278 5279bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5280 size_t* class_size) { 5281 self->AllowThreadSuspension(); 5282 size_t num_fields = 5283 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5284 5285 mirror::ObjectArray<mirror::ArtField>* fields = 5286 is_static ? klass->GetSFields() : klass->GetIFields(); 5287 5288 // Initialize field_offset 5289 MemberOffset field_offset(0); 5290 if (is_static) { 5291 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 5292 } else { 5293 mirror::Class* super_class = klass->GetSuperClass(); 5294 if (super_class != nullptr) { 5295 CHECK(super_class->IsResolved()) 5296 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5297 field_offset = MemberOffset(super_class->GetObjectSize()); 5298 } 5299 } 5300 5301 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5302 5303 // we want a relatively stable order so that adding new fields 5304 // minimizes disruption of C++ version such as Class and Method. 5305 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5306 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5307 "Naked ArtField references in deque"); 5308 for (size_t i = 0; i < num_fields; i++) { 5309 mirror::ArtField* f = fields->Get(i); 5310 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5311 grouped_and_sorted_fields.push_back(f); 5312 } 5313 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5314 LinkFieldsComparator()); 5315 5316 // References should be at the front. 5317 size_t current_field = 0; 5318 size_t num_reference_fields = 0; 5319 FieldGaps gaps; 5320 5321 for (; current_field < num_fields; current_field++) { 5322 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5323 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5324 bool isPrimitive = type != Primitive::kPrimNot; 5325 if (isPrimitive) { 5326 break; // past last reference, move on to the next phase 5327 } 5328 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>( 5329 field_offset.Uint32Value()))) { 5330 MemberOffset old_offset = field_offset; 5331 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5332 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5333 } 5334 DCHECK(IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(field_offset.Uint32Value())); 5335 grouped_and_sorted_fields.pop_front(); 5336 num_reference_fields++; 5337 field->SetOffset(field_offset); 5338 field_offset = MemberOffset(field_offset.Uint32Value() + 5339 sizeof(mirror::HeapReference<mirror::Object>)); 5340 } 5341 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5342 // otherwise we could end up with suboptimal gap fills. 5343 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5344 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5345 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5346 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5347 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5348 " fields."; 5349 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5350 5351 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5352 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5353 // We know there are no non-reference fields in the Reference classes, and we know 5354 // that 'referent' is alphabetically last, so this is easy... 5355 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5356 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5357 --num_reference_fields; 5358 } 5359 5360 size_t size = field_offset.Uint32Value(); 5361 // Update klass 5362 if (is_static) { 5363 klass->SetNumReferenceStaticFields(num_reference_fields); 5364 *class_size = size; 5365 } else { 5366 klass->SetNumReferenceInstanceFields(num_reference_fields); 5367 if (!klass->IsVariableSize()) { 5368 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 5369 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 5370 } else { 5371 std::string temp; 5372 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5373 size_t previous_size = klass->GetObjectSize(); 5374 if (previous_size != 0) { 5375 // Make sure that we didn't originally have an incorrect size. 5376 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5377 } 5378 klass->SetObjectSize(size); 5379 } 5380 } 5381 } 5382 5383 if (kIsDebugBuild) { 5384 // Make sure that the fields array is ordered by name but all reference 5385 // offsets are at the beginning as far as alignment allows. 5386 MemberOffset start_ref_offset = is_static 5387 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 5388 : klass->GetFirstReferenceInstanceFieldOffset(); 5389 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 5390 num_reference_fields * 5391 sizeof(mirror::HeapReference<mirror::Object>)); 5392 MemberOffset current_ref_offset = start_ref_offset; 5393 for (size_t i = 0; i < num_fields; i++) { 5394 mirror::ArtField* field = fields->Get(i); 5395 if ((false)) { // enable to debug field layout 5396 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5397 << " class=" << PrettyClass(klass.Get()) 5398 << " field=" << PrettyField(field) 5399 << " offset=" 5400 << field->GetField32(mirror::ArtField::OffsetOffset()); 5401 } 5402 if (i != 0) { 5403 mirror::ArtField* prev_field = fields->Get(i - 1u); 5404 // NOTE: The field names can be the same. This is not possible in the Java language 5405 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 5406 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 5407 } 5408 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5409 bool is_primitive = type != Primitive::kPrimNot; 5410 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5411 strcmp("referent", field->GetName()) == 0) { 5412 is_primitive = true; // We lied above, so we have to expect a lie here. 5413 } 5414 MemberOffset offset = field->GetOffsetDuringLinking(); 5415 if (is_primitive) { 5416 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 5417 // Shuffled before references. 5418 size_t type_size = Primitive::ComponentSize(type); 5419 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 5420 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 5421 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 5422 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 5423 } 5424 } else { 5425 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 5426 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 5427 sizeof(mirror::HeapReference<mirror::Object>)); 5428 } 5429 } 5430 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 5431 } 5432 return true; 5433} 5434 5435// Set the bitmap of reference instance field offsets. 5436void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5437 uint32_t reference_offsets = 0; 5438 mirror::Class* super_class = klass->GetSuperClass(); 5439 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5440 if (super_class != nullptr) { 5441 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5442 // Compute reference offsets unless our superclass overflowed. 5443 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5444 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5445 if (num_reference_fields != 0u) { 5446 // All of the fields that contain object references are guaranteed be grouped in memory 5447 // starting at an appropriately aligned address after super class object data. 5448 uint32_t start_offset = RoundUp(super_class->GetObjectSize(), 5449 sizeof(mirror::HeapReference<mirror::Object>)); 5450 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) / 5451 sizeof(mirror::HeapReference<mirror::Object>); 5452 if (start_bit + num_reference_fields > 32) { 5453 reference_offsets = mirror::Class::kClassWalkSuper; 5454 } else { 5455 reference_offsets |= (0xffffffffu << start_bit) & 5456 (0xffffffffu >> (32 - (start_bit + num_reference_fields))); 5457 } 5458 } 5459 } 5460 } 5461 klass->SetReferenceInstanceOffsets(reference_offsets); 5462} 5463 5464mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5465 Handle<mirror::DexCache> dex_cache) { 5466 DCHECK(dex_cache.Get() != nullptr); 5467 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5468 if (resolved != nullptr) { 5469 return resolved; 5470 } 5471 uint32_t utf16_length; 5472 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5473 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5474 dex_cache->SetResolvedString(string_idx, string); 5475 return string; 5476} 5477 5478mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5479 mirror::Class* referrer) { 5480 StackHandleScope<2> hs(Thread::Current()); 5481 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5482 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5483 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5484} 5485 5486mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5487 Handle<mirror::DexCache> dex_cache, 5488 Handle<mirror::ClassLoader> class_loader) { 5489 DCHECK(dex_cache.Get() != nullptr); 5490 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5491 if (resolved == nullptr) { 5492 Thread* self = Thread::Current(); 5493 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5494 resolved = FindClass(self, descriptor, class_loader); 5495 if (resolved != nullptr) { 5496 // TODO: we used to throw here if resolved's class loader was not the 5497 // boot class loader. This was to permit different classes with the 5498 // same name to be loaded simultaneously by different loaders 5499 dex_cache->SetResolvedType(type_idx, resolved); 5500 } else { 5501 CHECK(self->IsExceptionPending()) 5502 << "Expected pending exception for failed resolution of: " << descriptor; 5503 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5504 StackHandleScope<1> hs(self); 5505 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5506 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5507 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5508 self->ClearException(); 5509 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5510 self->GetException(nullptr)->SetCause(cause.Get()); 5511 } 5512 } 5513 } 5514 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5515 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5516 return resolved; 5517} 5518 5519mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5520 Handle<mirror::DexCache> dex_cache, 5521 Handle<mirror::ClassLoader> class_loader, 5522 Handle<mirror::ArtMethod> referrer, 5523 InvokeType type) { 5524 DCHECK(dex_cache.Get() != nullptr); 5525 // Check for hit in the dex cache. 5526 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5527 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5528 return resolved; 5529 } 5530 // Fail, get the declaring class. 5531 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5532 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5533 if (klass == nullptr) { 5534 DCHECK(Thread::Current()->IsExceptionPending()); 5535 return nullptr; 5536 } 5537 // Scan using method_idx, this saves string compares but will only hit for matching dex 5538 // caches/files. 5539 switch (type) { 5540 case kDirect: // Fall-through. 5541 case kStatic: 5542 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5543 break; 5544 case kInterface: 5545 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5546 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5547 break; 5548 case kSuper: // Fall-through. 5549 case kVirtual: 5550 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5551 break; 5552 default: 5553 LOG(FATAL) << "Unreachable - invocation type: " << type; 5554 UNREACHABLE(); 5555 } 5556 if (resolved == nullptr) { 5557 // Search by name, which works across dex files. 5558 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5559 const Signature signature = dex_file.GetMethodSignature(method_id); 5560 switch (type) { 5561 case kDirect: // Fall-through. 5562 case kStatic: 5563 resolved = klass->FindDirectMethod(name, signature); 5564 break; 5565 case kInterface: 5566 resolved = klass->FindInterfaceMethod(name, signature); 5567 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5568 break; 5569 case kSuper: // Fall-through. 5570 case kVirtual: 5571 resolved = klass->FindVirtualMethod(name, signature); 5572 break; 5573 } 5574 } 5575 // If we found a method, check for incompatible class changes. 5576 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5577 // Be a good citizen and update the dex cache to speed subsequent calls. 5578 dex_cache->SetResolvedMethod(method_idx, resolved); 5579 return resolved; 5580 } else { 5581 // If we had a method, it's an incompatible-class-change error. 5582 if (resolved != nullptr) { 5583 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5584 } else { 5585 // We failed to find the method which means either an access error, an incompatible class 5586 // change, or no such method. First try to find the method among direct and virtual methods. 5587 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5588 const Signature signature = dex_file.GetMethodSignature(method_id); 5589 switch (type) { 5590 case kDirect: 5591 case kStatic: 5592 resolved = klass->FindVirtualMethod(name, signature); 5593 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5594 // have had a resolved method before, which triggers the "true" branch above. 5595 break; 5596 case kInterface: 5597 case kVirtual: 5598 case kSuper: 5599 resolved = klass->FindDirectMethod(name, signature); 5600 break; 5601 } 5602 5603 // If we found something, check that it can be accessed by the referrer. 5604 bool exception_generated = false; 5605 if (resolved != nullptr && referrer.Get() != nullptr) { 5606 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5607 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5608 if (!referring_class->CanAccess(methods_class)) { 5609 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5610 resolved, type); 5611 exception_generated = true; 5612 } else if (!referring_class->CanAccessMember(methods_class, 5613 resolved->GetAccessFlags())) { 5614 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5615 exception_generated = true; 5616 } 5617 } 5618 if (!exception_generated) { 5619 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check 5620 // interface methods and throw if we find the method there. If we find nothing, throw a 5621 // NoSuchMethodError. 5622 switch (type) { 5623 case kDirect: 5624 case kStatic: 5625 if (resolved != nullptr) { 5626 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5627 } else { 5628 resolved = klass->FindInterfaceMethod(name, signature); 5629 if (resolved != nullptr) { 5630 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5631 } else { 5632 ThrowNoSuchMethodError(type, klass, name, signature); 5633 } 5634 } 5635 break; 5636 case kInterface: 5637 if (resolved != nullptr) { 5638 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5639 } else { 5640 resolved = klass->FindVirtualMethod(name, signature); 5641 if (resolved != nullptr) { 5642 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5643 } else { 5644 ThrowNoSuchMethodError(type, klass, name, signature); 5645 } 5646 } 5647 break; 5648 case kSuper: 5649 if (resolved != nullptr) { 5650 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5651 } else { 5652 ThrowNoSuchMethodError(type, klass, name, signature); 5653 } 5654 break; 5655 case kVirtual: 5656 if (resolved != nullptr) { 5657 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5658 } else { 5659 resolved = klass->FindInterfaceMethod(name, signature); 5660 if (resolved != nullptr) { 5661 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5662 } else { 5663 ThrowNoSuchMethodError(type, klass, name, signature); 5664 } 5665 } 5666 break; 5667 } 5668 } 5669 } 5670 Thread::Current()->AssertPendingException(); 5671 return nullptr; 5672 } 5673} 5674 5675mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5676 Handle<mirror::DexCache> dex_cache, 5677 Handle<mirror::ClassLoader> class_loader, 5678 bool is_static) { 5679 DCHECK(dex_cache.Get() != nullptr); 5680 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5681 if (resolved != nullptr) { 5682 return resolved; 5683 } 5684 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5685 Thread* const self = Thread::Current(); 5686 StackHandleScope<1> hs(self); 5687 Handle<mirror::Class> klass( 5688 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5689 if (klass.Get() == nullptr) { 5690 DCHECK(Thread::Current()->IsExceptionPending()); 5691 return nullptr; 5692 } 5693 5694 if (is_static) { 5695 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5696 } else { 5697 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5698 } 5699 5700 if (resolved == nullptr) { 5701 const char* name = dex_file.GetFieldName(field_id); 5702 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5703 if (is_static) { 5704 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5705 } else { 5706 resolved = klass->FindInstanceField(name, type); 5707 } 5708 if (resolved == nullptr) { 5709 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5710 return nullptr; 5711 } 5712 } 5713 dex_cache->SetResolvedField(field_idx, resolved); 5714 return resolved; 5715} 5716 5717mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5718 uint32_t field_idx, 5719 Handle<mirror::DexCache> dex_cache, 5720 Handle<mirror::ClassLoader> class_loader) { 5721 DCHECK(dex_cache.Get() != nullptr); 5722 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5723 if (resolved != nullptr) { 5724 return resolved; 5725 } 5726 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5727 Thread* self = Thread::Current(); 5728 StackHandleScope<1> hs(self); 5729 Handle<mirror::Class> klass( 5730 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5731 if (klass.Get() == nullptr) { 5732 DCHECK(Thread::Current()->IsExceptionPending()); 5733 return nullptr; 5734 } 5735 5736 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5737 StringPiece type(dex_file.StringDataByIdx( 5738 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5739 resolved = mirror::Class::FindField(self, klass, name, type); 5740 if (resolved != nullptr) { 5741 dex_cache->SetResolvedField(field_idx, resolved); 5742 } else { 5743 ThrowNoSuchFieldError("", klass.Get(), type, name); 5744 } 5745 return resolved; 5746} 5747 5748const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5749 uint32_t* length) { 5750 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5751 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5752 const DexFile& dex_file = *dex_cache->GetDexFile(); 5753 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5754 return dex_file.GetMethodShorty(method_id, length); 5755} 5756 5757void ClassLinker::DumpAllClasses(int flags) { 5758 if (dex_cache_image_class_lookup_required_) { 5759 MoveImageClassesToClassTable(); 5760 } 5761 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5762 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5763 std::vector<mirror::Class*> all_classes; 5764 { 5765 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5766 for (GcRoot<mirror::Class>& it : class_table_) { 5767 all_classes.push_back(it.Read()); 5768 } 5769 } 5770 5771 for (size_t i = 0; i < all_classes.size(); ++i) { 5772 all_classes[i]->DumpClass(std::cerr, flags); 5773 } 5774} 5775 5776static OatFile::OatMethod CreateOatMethod(const void* code, bool is_portable) { 5777 CHECK_EQ(kUsePortableCompiler, is_portable); 5778 CHECK(code != nullptr); 5779 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5780 base -= sizeof(void*); // Move backward so that code_offset != 0. 5781 const uint32_t code_offset = sizeof(void*); 5782 return OatFile::OatMethod(base, code_offset); 5783} 5784 5785bool ClassLinker::IsPortableResolutionStub(const void* entry_point) const { 5786 return (entry_point == GetPortableResolutionStub()) || 5787 (portable_resolution_trampoline_ == entry_point); 5788} 5789 5790bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5791 return (entry_point == GetQuickResolutionStub()) || 5792 (quick_resolution_trampoline_ == entry_point); 5793} 5794 5795bool ClassLinker::IsPortableToInterpreterBridge(const void* entry_point) const { 5796 return (entry_point == GetPortableToInterpreterBridge()); 5797 // TODO: portable_to_interpreter_bridge_trampoline_ == entry_point; 5798} 5799 5800bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5801 return (entry_point == GetQuickToInterpreterBridge()) || 5802 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5803} 5804 5805bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5806 return (entry_point == GetQuickGenericJniStub()) || 5807 (quick_generic_jni_trampoline_ == entry_point); 5808} 5809 5810const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5811 return GetQuickGenericJniStub(); 5812} 5813 5814void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code, 5815 bool is_portable) const { 5816 OatFile::OatMethod oat_method = CreateOatMethod(method_code, is_portable); 5817 oat_method.LinkMethod(method); 5818 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5819 // Create bridges to transition between different kinds of compiled bridge. 5820 if (method->GetEntryPointFromPortableCompiledCode() == nullptr) { 5821 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5822 } else { 5823 CHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 5824 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 5825 method->SetIsPortableCompiled(); 5826 } 5827} 5828 5829void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5830 if (!method->IsNative()) { 5831 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5832 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 5833 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5834 } else { 5835 const void* quick_method_code = GetQuickGenericJniStub(); 5836 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code, false); 5837 oat_method.LinkMethod(method); 5838 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5839 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5840 } 5841} 5842 5843void ClassLinker::DumpForSigQuit(std::ostream& os) { 5844 Thread* self = Thread::Current(); 5845 if (dex_cache_image_class_lookup_required_) { 5846 ScopedObjectAccess soa(self); 5847 MoveImageClassesToClassTable(); 5848 } 5849 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5850 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5851 << class_table_.Size() << "\n"; 5852} 5853 5854size_t ClassLinker::NumLoadedClasses() { 5855 if (dex_cache_image_class_lookup_required_) { 5856 MoveImageClassesToClassTable(); 5857 } 5858 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5859 // Only return non zygote classes since these are the ones which apps which care about. 5860 return class_table_.Size(); 5861} 5862 5863pid_t ClassLinker::GetClassesLockOwner() { 5864 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5865} 5866 5867pid_t ClassLinker::GetDexLockOwner() { 5868 return dex_lock_.GetExclusiveOwnerTid(); 5869} 5870 5871void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5872 DCHECK(!init_done_); 5873 5874 DCHECK(klass != nullptr); 5875 DCHECK(klass->GetClassLoader() == nullptr); 5876 5877 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5878 DCHECK(class_roots != nullptr); 5879 DCHECK(class_roots->Get(class_root) == nullptr); 5880 class_roots->Set<false>(class_root, klass); 5881} 5882 5883const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5884 static const char* class_roots_descriptors[] = { 5885 "Ljava/lang/Class;", 5886 "Ljava/lang/Object;", 5887 "[Ljava/lang/Class;", 5888 "[Ljava/lang/Object;", 5889 "Ljava/lang/String;", 5890 "Ljava/lang/DexCache;", 5891 "Ljava/lang/ref/Reference;", 5892 "Ljava/lang/reflect/ArtField;", 5893 "Ljava/lang/reflect/ArtMethod;", 5894 "Ljava/lang/reflect/Proxy;", 5895 "[Ljava/lang/String;", 5896 "[Ljava/lang/reflect/ArtField;", 5897 "[Ljava/lang/reflect/ArtMethod;", 5898 "Ljava/lang/ClassLoader;", 5899 "Ljava/lang/Throwable;", 5900 "Ljava/lang/ClassNotFoundException;", 5901 "Ljava/lang/StackTraceElement;", 5902 "Z", 5903 "B", 5904 "C", 5905 "D", 5906 "F", 5907 "I", 5908 "J", 5909 "S", 5910 "V", 5911 "[Z", 5912 "[B", 5913 "[C", 5914 "[D", 5915 "[F", 5916 "[I", 5917 "[J", 5918 "[S", 5919 "[Ljava/lang/StackTraceElement;", 5920 }; 5921 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5922 "Mismatch between class descriptors and class-root enum"); 5923 5924 const char* descriptor = class_roots_descriptors[class_root]; 5925 CHECK(descriptor != nullptr); 5926 return descriptor; 5927} 5928 5929std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 5930 const { 5931 std::string temp; 5932 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 5933} 5934 5935bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5936 const GcRoot<mirror::Class>& b) { 5937 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 5938 return false; 5939 } 5940 std::string temp; 5941 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 5942} 5943 5944std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 5945 const std::pair<const char*, mirror::ClassLoader*>& element) const { 5946 return ComputeModifiedUtf8Hash(element.first); 5947} 5948 5949bool ClassLinker::ClassDescriptorHashEquals::operator()( 5950 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) { 5951 if (a.Read()->GetClassLoader() != b.second) { 5952 return false; 5953 } 5954 return a.Read()->DescriptorEquals(b.first); 5955} 5956 5957bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5958 const char* descriptor) { 5959 return a.Read()->DescriptorEquals(descriptor); 5960} 5961 5962std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 5963 return ComputeModifiedUtf8Hash(descriptor); 5964} 5965 5966} // namespace art 5967