class_linker.cc revision 2535abe7d1fcdd0e6aca782b1f1932a703ed50a4
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <iostream> 21#include <memory> 22#include <queue> 23#include <string> 24#include <unistd.h> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "entrypoints/runtime_asm_entrypoints.h" 38#include "gc_root-inl.h" 39#include "gc/accounting/card_table-inl.h" 40#include "gc/accounting/heap_bitmap.h" 41#include "gc/heap.h" 42#include "gc/space/image_space.h" 43#include "handle_scope.h" 44#include "intern_table.h" 45#include "interpreter/interpreter.h" 46#include "jit/jit.h" 47#include "jit/jit_code_cache.h" 48#include "leb128.h" 49#include "oat.h" 50#include "oat_file.h" 51#include "object_lock.h" 52#include "mirror/art_field-inl.h" 53#include "mirror/art_method-inl.h" 54#include "mirror/class.h" 55#include "mirror/class-inl.h" 56#include "mirror/class_loader.h" 57#include "mirror/dex_cache-inl.h" 58#include "mirror/iftable-inl.h" 59#include "mirror/object-inl.h" 60#include "mirror/object_array-inl.h" 61#include "mirror/proxy.h" 62#include "mirror/reference-inl.h" 63#include "mirror/stack_trace_element.h" 64#include "mirror/string-inl.h" 65#include "os.h" 66#include "runtime.h" 67#include "entrypoints/entrypoint_utils.h" 68#include "ScopedLocalRef.h" 69#include "scoped_thread_state_change.h" 70#include "handle_scope-inl.h" 71#include "thread-inl.h" 72#include "utils.h" 73#include "verifier/method_verifier.h" 74#include "well_known_classes.h" 75 76namespace art { 77 78static void ThrowNoClassDefFoundError(const char* fmt, ...) 79 __attribute__((__format__(__printf__, 1, 2))) 80 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 81static void ThrowNoClassDefFoundError(const char* fmt, ...) { 82 va_list args; 83 va_start(args, fmt); 84 Thread* self = Thread::Current(); 85 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 86 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 87 va_end(args); 88} 89 90static void ThrowEarlierClassFailure(mirror::Class* c) 91 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 92 // The class failed to initialize on a previous attempt, so we want to throw 93 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 94 // failed in verification, in which case v2 5.4.1 says we need to re-throw 95 // the previous error. 96 Runtime* const runtime = Runtime::Current(); 97 if (!runtime->IsAotCompiler()) { // Give info if this occurs at runtime. 98 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 99 } 100 101 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 102 Thread* self = Thread::Current(); 103 if (runtime->IsAotCompiler()) { 104 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 105 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 106 self->SetException(ThrowLocation(), pre_allocated); 107 } else { 108 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 109 if (c->GetVerifyErrorClass() != NULL) { 110 // TODO: change the verifier to store an _instance_, with a useful detail message? 111 std::string temp; 112 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 113 PrettyDescriptor(c).c_str()); 114 } else { 115 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 116 PrettyDescriptor(c).c_str()); 117 } 118 } 119} 120 121static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 122 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 123 if (VLOG_IS_ON(class_linker)) { 124 std::string temp; 125 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 126 << klass->GetLocation() << "\n" << Thread::Current()->GetException(nullptr)->Dump(); 127 } 128} 129 130static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 131 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 132 Thread* self = Thread::Current(); 133 JNIEnv* env = self->GetJniEnv(); 134 135 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 136 CHECK(cause.get() != nullptr); 137 138 env->ExceptionClear(); 139 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 140 env->Throw(cause.get()); 141 142 // We only wrap non-Error exceptions; an Error can just be used as-is. 143 if (!is_error) { 144 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 145 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 146 nullptr); 147 } 148 VlogClassInitializationFailure(klass); 149} 150 151// Gap between two fields in object layout. 152struct FieldGap { 153 uint32_t start_offset; // The offset from the start of the object. 154 uint32_t size; // The gap size of 1, 2, or 4 bytes. 155}; 156struct FieldGapsComparator { 157 explicit FieldGapsComparator() { 158 } 159 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 160 NO_THREAD_SAFETY_ANALYSIS { 161 // Sort by gap size, largest first. Secondary sort by starting offset. 162 return lhs.size > rhs.size || (lhs.size == rhs.size && lhs.start_offset < rhs.start_offset); 163 } 164}; 165typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 166 167// Adds largest aligned gaps to queue of gaps. 168static void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 169 DCHECK(gaps != nullptr); 170 171 uint32_t current_offset = gap_start; 172 while (current_offset != gap_end) { 173 size_t remaining = gap_end - current_offset; 174 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 175 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 176 current_offset += sizeof(uint32_t); 177 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 178 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 179 current_offset += sizeof(uint16_t); 180 } else { 181 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 182 current_offset += sizeof(uint8_t); 183 } 184 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 185 } 186} 187// Shuffle fields forward, making use of gaps whenever possible. 188template<int n> 189static void ShuffleForward(size_t* current_field_idx, 190 MemberOffset* field_offset, 191 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 192 FieldGaps* gaps) 193 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 194 DCHECK(current_field_idx != nullptr); 195 DCHECK(grouped_and_sorted_fields != nullptr); 196 DCHECK(gaps != nullptr); 197 DCHECK(field_offset != nullptr); 198 199 DCHECK(IsPowerOfTwo(n)); 200 while (!grouped_and_sorted_fields->empty()) { 201 mirror::ArtField* field = grouped_and_sorted_fields->front(); 202 Primitive::Type type = field->GetTypeAsPrimitiveType(); 203 if (Primitive::ComponentSize(type) < n) { 204 break; 205 } 206 if (!IsAligned<n>(field_offset->Uint32Value())) { 207 MemberOffset old_offset = *field_offset; 208 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 209 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 210 } 211 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 212 grouped_and_sorted_fields->pop_front(); 213 if (!gaps->empty() && gaps->top().size >= n) { 214 FieldGap gap = gaps->top(); 215 gaps->pop(); 216 DCHECK(IsAligned<n>(gap.start_offset)); 217 field->SetOffset(MemberOffset(gap.start_offset)); 218 if (gap.size > n) { 219 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 220 } 221 } else { 222 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 223 field->SetOffset(*field_offset); 224 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 225 } 226 ++(*current_field_idx); 227 } 228} 229 230ClassLinker::ClassLinker(InternTable* intern_table) 231 // dex_lock_ is recursive as it may be used in stack dumping. 232 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 233 dex_cache_image_class_lookup_required_(false), 234 failed_dex_cache_class_lookups_(0), 235 class_roots_(nullptr), 236 array_iftable_(nullptr), 237 find_array_class_cache_next_victim_(0), 238 init_done_(false), 239 log_new_dex_caches_roots_(false), 240 log_new_class_table_roots_(false), 241 intern_table_(intern_table), 242 quick_resolution_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(std::vector<std::unique_ptr<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 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 382 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 383 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 384 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 385 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 386 387 // Set up array classes for string, field, method 388 Handle<mirror::Class> object_array_string(hs.NewHandle( 389 AllocClass(self, java_lang_Class.Get(), 390 mirror::ObjectArray<mirror::String>::ClassSize()))); 391 object_array_string->SetComponentType(java_lang_String.Get()); 392 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 393 394 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 395 AllocClass(self, java_lang_Class.Get(), 396 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 397 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 398 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 399 400 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 401 AllocClass(self, java_lang_Class.Get(), 402 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 403 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 404 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 405 406 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 407 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 408 // these roots. 409 CHECK_NE(0U, boot_class_path.size()); 410 for (auto& dex_file : boot_class_path) { 411 CHECK(dex_file.get() != nullptr); 412 AppendToBootClassPath(self, *dex_file); 413 opened_dex_files_.push_back(std::move(dex_file)); 414 } 415 416 // now we can use FindSystemClass 417 418 // run char class through InitializePrimitiveClass to finish init 419 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 420 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 421 422 // Create runtime resolution and imt conflict methods. Also setup the default imt. 423 Runtime* runtime = Runtime::Current(); 424 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 425 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 426 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 427 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 428 429 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 430 // we do not need friend classes or a publicly exposed setter. 431 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 432 if (!runtime->IsAotCompiler()) { 433 // We need to set up the generic trampolines since we don't have an image. 434 quick_resolution_trampoline_ = GetQuickResolutionStub(); 435 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 436 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 437 } 438 439 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 440 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 441 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 442 CHECK_EQ(java_lang_Object.Get(), Object_class); 443 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 444 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 445 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 446 std::ostringstream os1, os2; 447 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 448 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 449 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 450 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 451 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 452 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 453 CHECK_EQ(java_lang_String.Get(), String_class); 454 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 455 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 456 457 // Setup the primitive array type classes - can't be done until Object has a vtable. 458 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 459 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 460 461 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 462 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 463 464 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 465 CHECK_EQ(char_array_class.Get(), found_char_array_class); 466 467 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 468 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 469 470 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 471 CHECK_EQ(int_array_class.Get(), found_int_array_class); 472 473 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 474 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 475 476 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 477 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 478 479 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 480 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 481 482 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 483 CHECK_EQ(class_array_class.Get(), found_class_array_class); 484 485 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 486 CHECK_EQ(object_array_class.Get(), found_object_array_class); 487 488 // Setup the single, global copy of "iftable". 489 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 490 CHECK(java_lang_Cloneable != nullptr); 491 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 492 CHECK(java_io_Serializable != nullptr); 493 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 494 // crawl up and explicitly list all of the supers as well. 495 { 496 mirror::IfTable* array_iftable = array_iftable_.Read(); 497 array_iftable->SetInterface(0, java_lang_Cloneable); 498 array_iftable->SetInterface(1, java_io_Serializable); 499 } 500 501 // Sanity check Class[] and Object[]'s interfaces. 502 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 503 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 504 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 505 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 506 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 507 // dex_cache_ fields and register them in class_table_. 508 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 509 CHECK_EQ(java_lang_Class.Get(), Class_class); 510 511 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 512 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 513 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 514 515 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 516 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 517 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 518 519 mirror::Class* String_array_class = 520 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 521 CHECK_EQ(object_array_string.Get(), String_array_class); 522 523 mirror::Class* Art_method_array_class = 524 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 525 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 526 527 mirror::Class* Art_field_array_class = 528 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 529 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 530 531 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 532 533 // Create java.lang.reflect.Proxy root. 534 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 535 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 536 537 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 538 // finish initializing Reference class 539 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 540 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 541 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 542 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 543 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 544 mirror::Class* java_lang_ref_FinalizerReference = 545 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 546 java_lang_ref_FinalizerReference->SetAccessFlags( 547 java_lang_ref_FinalizerReference->GetAccessFlags() | 548 kAccClassIsReference | kAccClassIsFinalizerReference); 549 mirror::Class* java_lang_ref_PhantomReference = 550 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 551 java_lang_ref_PhantomReference->SetAccessFlags( 552 java_lang_ref_PhantomReference->GetAccessFlags() | 553 kAccClassIsReference | kAccClassIsPhantomReference); 554 mirror::Class* java_lang_ref_SoftReference = 555 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 556 java_lang_ref_SoftReference->SetAccessFlags( 557 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 558 mirror::Class* java_lang_ref_WeakReference = 559 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 560 java_lang_ref_WeakReference->SetAccessFlags( 561 java_lang_ref_WeakReference->GetAccessFlags() | 562 kAccClassIsReference | kAccClassIsWeakReference); 563 564 // Setup the ClassLoader, verifying the object_size_. 565 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 566 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 567 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 568 569 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 570 // java.lang.StackTraceElement as a convenience. 571 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 572 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 573 SetClassRoot(kJavaLangClassNotFoundException, 574 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 575 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 576 SetClassRoot(kJavaLangStackTraceElementArrayClass, 577 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 578 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 579 580 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly 581 // initialized. 582 { 583 const DexFile& dex_file = java_lang_Object->GetDexFile(); 584 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 585 CHECK(void_string_id != nullptr); 586 uint32_t void_string_index = dex_file.GetIndexForStringId(*void_string_id); 587 const DexFile::TypeId* void_type_id = dex_file.FindTypeId(void_string_index); 588 CHECK(void_type_id != nullptr); 589 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id); 590 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class 591 // as referrer so the used dex cache is core's one. 592 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get()); 593 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid)); 594 self->AssertNoPendingException(); 595 } 596 597 FinishInit(self); 598 599 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 600} 601 602void ClassLinker::FinishInit(Thread* self) { 603 VLOG(startup) << "ClassLinker::FinishInit entering"; 604 605 // Let the heap know some key offsets into java.lang.ref instances 606 // Note: we hard code the field indexes here rather than using FindInstanceField 607 // as the types of the field can't be resolved prior to the runtime being 608 // fully initialized 609 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 610 mirror::Class* java_lang_ref_FinalizerReference = 611 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 612 613 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 614 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 615 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 616 617 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 618 CHECK_STREQ(queue->GetName(), "queue"); 619 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 620 621 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 622 CHECK_STREQ(queueNext->GetName(), "queueNext"); 623 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 624 625 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 626 CHECK_STREQ(referent->GetName(), "referent"); 627 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 628 629 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 630 CHECK_STREQ(zombie->GetName(), "zombie"); 631 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 632 633 // ensure all class_roots_ are initialized 634 for (size_t i = 0; i < kClassRootsMax; i++) { 635 ClassRoot class_root = static_cast<ClassRoot>(i); 636 mirror::Class* klass = GetClassRoot(class_root); 637 CHECK(klass != nullptr); 638 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 639 // note SetClassRoot does additional validation. 640 // if possible add new checks there to catch errors early 641 } 642 643 CHECK(!array_iftable_.IsNull()); 644 645 // disable the slow paths in FindClass and CreatePrimitiveClass now 646 // that Object, Class, and Object[] are setup 647 init_done_ = true; 648 649 VLOG(startup) << "ClassLinker::FinishInit exiting"; 650} 651 652void ClassLinker::RunRootClinits() { 653 Thread* self = Thread::Current(); 654 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 655 mirror::Class* c = GetClassRoot(ClassRoot(i)); 656 if (!c->IsArrayClass() && !c->IsPrimitive()) { 657 StackHandleScope<1> hs(self); 658 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 659 EnsureInitialized(self, h_class, true, true); 660 self->AssertNoPendingException(); 661 } 662 } 663} 664 665bool ClassLinker::GenerateOatFile(const char* dex_filename, 666 int oat_fd, 667 const char* oat_cache_filename, 668 std::string* error_msg) { 669 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 670 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 671 672 gc::Heap* heap = Runtime::Current()->GetHeap(); 673 std::string boot_image_option("--boot-image="); 674 if (heap->GetImageSpace() == nullptr) { 675 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 676 // out of space anyway it might not matter. 677 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 678 "without an image.", dex_filename); 679 return false; 680 } 681 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 682 683 std::string dex_file_option("--dex-file="); 684 dex_file_option += dex_filename; 685 686 std::string oat_fd_option("--oat-fd="); 687 StringAppendF(&oat_fd_option, "%d", oat_fd); 688 689 std::string oat_location_option("--oat-location="); 690 oat_location_option += oat_cache_filename; 691 692 std::vector<std::string> argv; 693 argv.push_back(dex2oat); 694 argv.push_back("--runtime-arg"); 695 argv.push_back("-classpath"); 696 argv.push_back("--runtime-arg"); 697 argv.push_back(Runtime::Current()->GetClassPathString()); 698 699 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 700 701 if (!Runtime::Current()->IsVerificationEnabled()) { 702 argv.push_back("--compiler-filter=verify-none"); 703 } 704 705 if (Runtime::Current()->MustRelocateIfPossible()) { 706 argv.push_back("--runtime-arg"); 707 argv.push_back("-Xrelocate"); 708 } else { 709 argv.push_back("--runtime-arg"); 710 argv.push_back("-Xnorelocate"); 711 } 712 713 if (!kIsTargetBuild) { 714 argv.push_back("--host"); 715 } 716 717 argv.push_back(boot_image_option); 718 argv.push_back(dex_file_option); 719 argv.push_back(oat_fd_option); 720 argv.push_back(oat_location_option); 721 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 722 for (size_t i = 0; i < compiler_options.size(); ++i) { 723 argv.push_back(compiler_options[i].c_str()); 724 } 725 726 if (!Exec(argv, error_msg)) { 727 // Manually delete the file. Ensures there is no garbage left over if the process unexpectedly 728 // died. Ignore unlink failure, propagate the original error. 729 TEMP_FAILURE_RETRY(unlink(oat_cache_filename)); 730 return false; 731 } 732 733 return true; 734} 735 736const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 737 WriterMutexLock mu(Thread::Current(), dex_lock_); 738 if (kIsDebugBuild) { 739 for (size_t i = 0; i < oat_files_.size(); ++i) { 740 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 741 } 742 } 743 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 744 oat_files_.push_back(oat_file); 745 return oat_file; 746} 747 748OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 749 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 750 OatFile* oat_file = space->ReleaseOatFile(); 751 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 752 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 753 return *oat_file; 754} 755 756const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 757 const char* dex_location = dex_file.GetLocation().c_str(); 758 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 759 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 760} 761 762const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 763 const char* dex_location, 764 const uint32_t* dex_location_checksum) { 765 ReaderMutexLock mu(Thread::Current(), dex_lock_); 766 for (const OatFile* oat_file : oat_files_) { 767 DCHECK(oat_file != nullptr); 768 769 if (oat_location != nullptr) { 770 if (oat_file->GetLocation() != oat_location) { 771 continue; 772 } 773 } 774 775 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 776 dex_location_checksum, 777 false); 778 if (oat_dex_file != nullptr) { 779 return oat_dex_file; 780 } 781 } 782 return nullptr; 783} 784 785 786// Loads all multi dex files from the given oat file returning true on success. 787// 788// Parameters: 789// oat_file - the oat file to load from 790// dex_location - the dex location used to generate the oat file 791// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 792// generated - whether or not the oat_file existed before or was just (re)generated 793// error_msgs - any error messages will be appended here 794// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 795static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 796 const char* dex_location, 797 const uint32_t* dex_location_checksum, 798 bool generated, 799 std::vector<std::string>* error_msgs, 800 std::vector<std::unique_ptr<const DexFile>>* dex_files) { 801 if (oat_file == nullptr) { 802 return false; 803 } 804 805 size_t old_size = dex_files->size(); // To rollback on error. 806 807 bool success = true; 808 for (size_t i = 0; success; ++i) { 809 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 810 const char* next_name = next_name_str.c_str(); 811 812 uint32_t next_location_checksum; 813 uint32_t* next_location_checksum_pointer = &next_location_checksum; 814 std::string error_msg; 815 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 816 // When i=0 the multidex name should be the same as the location name. We already have the 817 // checksum it so we don't need to recompute it. 818 if (dex_location_checksum == nullptr) { 819 next_location_checksum_pointer = nullptr; 820 } else { 821 next_location_checksum = *dex_location_checksum; 822 } 823 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 824 DCHECK_EQ(false, i == 0 && generated); 825 next_location_checksum_pointer = nullptr; 826 } 827 828 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 829 830 if (oat_dex_file == nullptr) { 831 if (i == 0 && generated) { 832 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 833 " file'%s'", dex_location, next_location_checksum, 834 oat_file->GetLocation().c_str()); 835 error_msgs->push_back(error_msg); 836 } 837 break; // Not found, done. 838 } 839 840 // Checksum test. Test must succeed when generated. 841 success = !generated; 842 if (next_location_checksum_pointer != nullptr) { 843 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 844 } 845 846 if (success) { 847 std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg); 848 if (dex_file.get() == nullptr) { 849 success = false; 850 error_msgs->push_back(error_msg); 851 } else { 852 dex_files->push_back(std::move(dex_file)); 853 } 854 } 855 856 // When we generated the file, we expect success, or something is terribly wrong. 857 CHECK_EQ(false, generated && !success) 858 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 859 << std::hex << " dex_location_checksum=" << next_location_checksum 860 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 861 } 862 863 if (dex_files->size() == old_size) { 864 success = false; // We did not even find classes.dex 865 } 866 867 if (success) { 868 return true; 869 } else { 870 dex_files->erase(dex_files->begin() + old_size, dex_files->end()); 871 return false; 872 } 873} 874 875// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 876// complicates the loading process, as we should not use an iterative loading process, because that 877// would register the oat file and dex files that come before the broken one. Instead, check all 878// multidex ahead of time. 879bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 880 std::vector<std::string>* error_msgs, 881 std::vector<std::unique_ptr<const DexFile>>* dex_files) { 882 // 1) Check whether we have an open oat file. 883 // This requires a dex checksum, use the "primary" one. 884 uint32_t dex_location_checksum; 885 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 886 bool have_checksum = true; 887 std::string checksum_error_msg; 888 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 889 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 890 dex_location_checksum_pointer = nullptr; 891 have_checksum = false; 892 } 893 894 bool needs_registering = false; 895 896 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 897 dex_location_checksum_pointer); 898 std::unique_ptr<const OatFile> open_oat_file( 899 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 900 901 // 2) If we do not have an open one, maybe there's one on disk already. 902 903 // In case the oat file is not open, we play a locking game here so 904 // that if two different processes race to load and register or generate 905 // (or worse, one tries to open a partial generated file) we will be okay. 906 // This is actually common with apps that use DexClassLoader to work 907 // around the dex method reference limit and that have a background 908 // service running in a separate process. 909 ScopedFlock scoped_flock; 910 911 if (open_oat_file.get() == nullptr) { 912 if (oat_location != nullptr) { 913 // Can only do this if we have a checksum, else error. 914 if (!have_checksum) { 915 error_msgs->push_back(checksum_error_msg); 916 return false; 917 } 918 919 std::string error_msg; 920 921 // We are loading or creating one in the future. Time to set up the file lock. 922 if (!scoped_flock.Init(oat_location, &error_msg)) { 923 error_msgs->push_back(error_msg); 924 return false; 925 } 926 927 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 928 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 929 oat_location, &error_msg)); 930 931 if (open_oat_file.get() == nullptr) { 932 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 933 dex_location, oat_location, error_msg.c_str()); 934 VLOG(class_linker) << compound_msg; 935 error_msgs->push_back(compound_msg); 936 } 937 } else { 938 // TODO: What to lock here? 939 bool obsolete_file_cleanup_failed; 940 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 941 dex_location_checksum_pointer, 942 kRuntimeISA, error_msgs, 943 &obsolete_file_cleanup_failed)); 944 // There's no point in going forward and eventually try to regenerate the 945 // file if we couldn't remove the obsolete one. Mostly likely we will fail 946 // with the same error when trying to write the new file. 947 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 948 if (obsolete_file_cleanup_failed) { 949 return false; 950 } 951 } 952 needs_registering = true; 953 } 954 955 // 3) If we have an oat file, check all contained multidex files for our dex_location. 956 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 957 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 958 dex_location_checksum_pointer, 959 false, error_msgs, dex_files); 960 if (success) { 961 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 962 if (needs_registering) { 963 // We opened the oat file, so we must register it. 964 RegisterOatFile(oat_file); 965 } 966 // If the file isn't executable we failed patchoat but did manage to get the dex files. 967 return oat_file->IsExecutable(); 968 } else { 969 if (needs_registering) { 970 // We opened it, delete it. 971 open_oat_file.reset(); 972 } else { 973 open_oat_file.release(); // Do not delete open oat files. 974 } 975 } 976 977 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 978 979 // Need a checksum, fail else. 980 if (!have_checksum) { 981 error_msgs->push_back(checksum_error_msg); 982 return false; 983 } 984 985 // Look in cache location if no oat_location is given. 986 std::string cache_location; 987 if (oat_location == nullptr) { 988 // Use the dalvik cache. 989 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 990 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 991 oat_location = cache_location.c_str(); 992 } 993 994 bool has_flock = true; 995 // Definitely need to lock now. 996 if (!scoped_flock.HasFile()) { 997 std::string error_msg; 998 if (!scoped_flock.Init(oat_location, &error_msg)) { 999 error_msgs->push_back(error_msg); 1000 has_flock = false; 1001 } 1002 } 1003 1004 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1005 // Create the oat file. 1006 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1007 oat_location, error_msgs)); 1008 } 1009 1010 // Failed, bail. 1011 if (open_oat_file.get() == nullptr) { 1012 std::string error_msg; 1013 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1014 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1015 error_msgs->push_back(error_msg); 1016 return false; 1017 } 1018 1019 // Try to load again, but stronger checks. 1020 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1021 dex_location_checksum_pointer, 1022 true, error_msgs, dex_files); 1023 if (success) { 1024 RegisterOatFile(open_oat_file.release()); 1025 return true; 1026 } else { 1027 return false; 1028 } 1029} 1030 1031const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1032 uint32_t dex_location_checksum, 1033 const char* oat_location, 1034 std::string* error_msg) { 1035 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1036 !Runtime::Current()->IsAotCompiler(), error_msg)); 1037 if (oat_file.get() == nullptr) { 1038 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1039 error_msg->c_str()); 1040 return nullptr; 1041 } 1042 Runtime* runtime = Runtime::Current(); 1043 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1044 if (image_space != nullptr) { 1045 const ImageHeader& image_header = image_space->GetImageHeader(); 1046 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1047 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1048 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1049 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1050 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1051 actual_image_oat_checksum); 1052 return nullptr; 1053 } 1054 1055 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1056 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1057 if (expected_image_oat_offset != actual_image_oat_offset) { 1058 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1059 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1060 actual_image_oat_offset); 1061 return nullptr; 1062 } 1063 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1064 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1065 if (expected_patch_delta != actual_patch_delta) { 1066 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1067 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1068 return nullptr; 1069 } 1070 } 1071 1072 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1073 &dex_location_checksum); 1074 if (oat_dex_file == nullptr) { 1075 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1076 dex_location); 1077 return nullptr; 1078 } 1079 uint32_t expected_dex_checksum = dex_location_checksum; 1080 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1081 if (expected_dex_checksum != actual_dex_checksum) { 1082 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1083 "found 0x%x", oat_location, expected_dex_checksum, 1084 actual_dex_checksum); 1085 return nullptr; 1086 } 1087 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1088 if (dex_file.get() != nullptr) { 1089 return oat_file.release(); 1090 } else { 1091 return nullptr; 1092 } 1093} 1094 1095const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1096 int fd, const char* oat_location, 1097 std::vector<std::string>* error_msgs) { 1098 // Generate the output oat file for the dex file 1099 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1100 std::string error_msg; 1101 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1102 CHECK(!error_msg.empty()); 1103 error_msgs->push_back(error_msg); 1104 return nullptr; 1105 } 1106 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1107 !Runtime::Current()->IsAotCompiler(), 1108 &error_msg)); 1109 if (oat_file.get() == nullptr) { 1110 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1111 oat_location, error_msg.c_str()); 1112 error_msgs->push_back(compound_msg); 1113 return nullptr; 1114 } 1115 1116 return oat_file.release(); 1117} 1118 1119bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1120 const InstructionSet instruction_set) { 1121 Runtime* runtime = Runtime::Current(); 1122 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1123 if (image_space == nullptr) { 1124 return false; 1125 } 1126 uint32_t image_oat_checksum = 0; 1127 if (instruction_set == kRuntimeISA) { 1128 const ImageHeader& image_header = image_space->GetImageHeader(); 1129 image_oat_checksum = image_header.GetOatChecksum(); 1130 } else { 1131 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1132 image_space->GetImageLocation().c_str(), instruction_set)); 1133 image_oat_checksum = image_header->GetOatChecksum(); 1134 } 1135 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1136} 1137 1138bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1139 const InstructionSet instruction_set, 1140 std::string* error_msg) { 1141 Runtime* runtime = Runtime::Current(); 1142 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1143 if (image_space == nullptr) { 1144 *error_msg = "No image space for verification against"; 1145 return false; 1146 } 1147 1148 // If the requested instruction set is the same as the current runtime, 1149 // we can use the checksums directly. If it isn't, we'll have to read the 1150 // image header from the image for the right instruction set. 1151 uint32_t image_oat_checksum = 0; 1152 uintptr_t image_oat_data_begin = 0; 1153 int32_t image_patch_delta = 0; 1154 if (instruction_set == runtime->GetInstructionSet()) { 1155 const ImageHeader& image_header = image_space->GetImageHeader(); 1156 image_oat_checksum = image_header.GetOatChecksum(); 1157 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1158 image_patch_delta = image_header.GetPatchDelta(); 1159 } else { 1160 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1161 image_space->GetImageLocation().c_str(), instruction_set)); 1162 image_oat_checksum = image_header->GetOatChecksum(); 1163 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1164 image_patch_delta = image_header->GetPatchDelta(); 1165 } 1166 const OatHeader& oat_header = oat_file->GetOatHeader(); 1167 bool ret = (oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum); 1168 1169 // If the oat file is PIC, it doesn't care if/how image was relocated. Ignore these checks. 1170 if (!oat_file->IsPic()) { 1171 ret = ret && (oat_header.GetImagePatchDelta() == image_patch_delta) 1172 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin); 1173 } 1174 if (!ret) { 1175 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1176 oat_file->GetLocation().c_str(), 1177 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1178 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1179 oat_file->GetOatHeader().GetImagePatchDelta(), 1180 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1181 } 1182 return ret; 1183} 1184 1185bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1186 const char* dex_location, 1187 uint32_t dex_location_checksum, 1188 const InstructionSet instruction_set, 1189 std::string* error_msg) { 1190 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1191 return false; 1192 } 1193 1194 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1195 &dex_location_checksum); 1196 if (oat_dex_file == nullptr) { 1197 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1198 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1199 for (const OatFile::OatDexFile* oat_dex_file_in : oat_file->GetOatDexFiles()) { 1200 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1201 oat_file->GetLocation().c_str(), 1202 oat_dex_file_in->GetDexFileLocation().c_str(), 1203 oat_dex_file_in->GetDexFileLocationChecksum()); 1204 } 1205 return false; 1206 } 1207 1208 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1209 return true; 1210} 1211 1212bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1213 const char* dex_location, 1214 const uint32_t* dex_location_checksum, 1215 std::string* error_msg) { 1216 CHECK(oat_file != nullptr); 1217 CHECK(dex_location != nullptr); 1218 std::unique_ptr<const DexFile> dex_file; 1219 if (dex_location_checksum == nullptr) { 1220 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1221 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1222 // directory. 1223 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1224 if (oat_dex_file == nullptr) { 1225 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1226 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1227 error_msg->c_str()); 1228 return false; 1229 } 1230 dex_file = oat_dex_file->OpenDexFile(error_msg); 1231 } else { 1232 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1233 kRuntimeISA, error_msg); 1234 if (!verified) { 1235 return false; 1236 } 1237 dex_file = oat_file->GetOatDexFile(dex_location, 1238 dex_location_checksum)->OpenDexFile(error_msg); 1239 } 1240 return dex_file.get() != nullptr; 1241} 1242 1243const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1244 const char* dex_location, 1245 const uint32_t* dex_location_checksum, 1246 InstructionSet isa, 1247 std::vector<std::string>* error_msgs, 1248 bool* obsolete_file_cleanup_failed) { 1249 *obsolete_file_cleanup_failed = false; 1250 bool already_opened = false; 1251 std::string dex_location_str(dex_location); 1252 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1253 &already_opened, 1254 obsolete_file_cleanup_failed, 1255 error_msgs)); 1256 std::string error_msg; 1257 if (oat_file.get() == nullptr) { 1258 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1259 dex_location)); 1260 return nullptr; 1261 } else if (oat_file->IsExecutable() && 1262 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1263 dex_location_checksum, &error_msg)) { 1264 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1265 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1266 error_msg.c_str())); 1267 return nullptr; 1268 } else if (!oat_file->IsExecutable() && 1269 Runtime::Current()->GetHeap()->HasImageSpace() && 1270 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1271 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1272 "dex location '%s'. Image checksum incorrect.", 1273 oat_file->GetLocation().c_str(), dex_location)); 1274 return nullptr; 1275 } else { 1276 return oat_file.release(); 1277 } 1278} 1279 1280const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1281 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1282 for (size_t i = 0; i < oat_files_.size(); i++) { 1283 const OatFile* oat_file = oat_files_[i]; 1284 DCHECK(oat_file != nullptr); 1285 if (oat_file->GetLocation() == oat_location) { 1286 return oat_file; 1287 } 1288 } 1289 return nullptr; 1290} 1291 1292const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1293 InstructionSet isa, 1294 bool *already_opened, 1295 bool *obsolete_file_cleanup_failed, 1296 std::vector<std::string>* error_msgs) { 1297 // Find out if we've already opened the file 1298 const OatFile* ret = nullptr; 1299 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1300 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1301 if (ret != nullptr) { 1302 *already_opened = true; 1303 return ret; 1304 } 1305 1306 std::string dalvik_cache; 1307 bool have_android_data = false; 1308 bool have_dalvik_cache = false; 1309 bool is_global_cache = false; 1310 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1311 &have_android_data, &have_dalvik_cache, &is_global_cache); 1312 std::string cache_filename; 1313 if (have_dalvik_cache) { 1314 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1315 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1316 if (ret != nullptr) { 1317 *already_opened = true; 1318 return ret; 1319 } 1320 } else { 1321 // If we need to relocate we should just place odex back where it started. 1322 cache_filename = odex_filename; 1323 } 1324 1325 ret = nullptr; 1326 1327 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1328 // 1329 // Now we do the following: 1330 // 1) Try and open the odex version 1331 // 2) If present, checksum-verified & relocated correctly return it 1332 // 3) Close the odex version to free up its address space. 1333 // 4) Try and open the cache version 1334 // 5) If present, checksum-verified & relocated correctly return it 1335 // 6) Close the cache version to free up its address space. 1336 // 7) If we should relocate: 1337 // a) If we have opened and checksum-verified the odex version relocate it to 1338 // 'cache_filename' and return it 1339 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1340 // it. This should not happen often (I think only the run-test's will hit this case). 1341 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1342 // this point. 1343 // 9) Return nullptr 1344 1345 *already_opened = false; 1346 const Runtime* runtime = Runtime::Current(); 1347 CHECK(runtime != nullptr); 1348 bool executable = !runtime->IsAotCompiler(); 1349 1350 std::string odex_error_msg; 1351 bool should_patch_system = false; 1352 bool odex_checksum_verified = false; 1353 bool have_system_odex = false; 1354 { 1355 // There is a high probability that both these oat files map similar/the same address 1356 // spaces so we must scope them like this so they each gets its turn. 1357 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1358 nullptr, 1359 executable, &odex_error_msg)); 1360 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1361 &odex_checksum_verified, 1362 &odex_error_msg)) { 1363 return odex_oat_file.release(); 1364 } else { 1365 if (odex_checksum_verified) { 1366 // We can just relocate 1367 should_patch_system = true; 1368 odex_error_msg = "Image Patches are incorrect"; 1369 } 1370 if (odex_oat_file.get() != nullptr) { 1371 have_system_odex = true; 1372 } 1373 } 1374 } 1375 1376 std::string cache_error_msg; 1377 bool should_patch_cache = false; 1378 bool cache_checksum_verified = false; 1379 if (have_dalvik_cache) { 1380 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1381 nullptr, 1382 executable, &cache_error_msg)); 1383 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1384 &cache_checksum_verified, 1385 &cache_error_msg)) { 1386 return cache_oat_file.release(); 1387 } else if (cache_checksum_verified) { 1388 // We can just relocate 1389 should_patch_cache = true; 1390 cache_error_msg = "Image Patches are incorrect"; 1391 } 1392 } else if (have_android_data) { 1393 // dalvik_cache does not exist but android data does. This means we should be able to create 1394 // it, so we should try. 1395 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1396 } 1397 1398 ret = nullptr; 1399 std::string error_msg; 1400 if (runtime->CanRelocate()) { 1401 // Run relocation 1402 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1403 if (space != nullptr) { 1404 const std::string& image_location = space->GetImageLocation(); 1405 if (odex_checksum_verified && should_patch_system) { 1406 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1407 } else if (cache_checksum_verified && should_patch_cache) { 1408 CHECK(have_dalvik_cache); 1409 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1410 } 1411 } else if (have_system_odex) { 1412 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1413 } 1414 } 1415 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1416 // implicitly: were able to fine where the cached version is but we were unable to use it, 1417 // either as a destination for relocation or to open a file. We should delete it if it is 1418 // there. 1419 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1420 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1421 "searching for dex file %s: %s", 1422 cache_filename.c_str(), dex_location.c_str(), 1423 strerror(errno)); 1424 error_msgs->push_back(rm_error_msg); 1425 VLOG(class_linker) << rm_error_msg; 1426 // Let the caller know that we couldn't remove the obsolete file. 1427 // This is a good indication that further writes may fail as well. 1428 *obsolete_file_cleanup_failed = true; 1429 } 1430 } 1431 if (ret == nullptr) { 1432 VLOG(class_linker) << error_msg; 1433 error_msgs->push_back(error_msg); 1434 std::string relocation_msg; 1435 if (runtime->CanRelocate()) { 1436 relocation_msg = StringPrintf(" and relocation failed"); 1437 } 1438 if (have_dalvik_cache && cache_checksum_verified) { 1439 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1440 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1441 cache_filename.c_str(), cache_error_msg.c_str(), 1442 relocation_msg.c_str()); 1443 } else { 1444 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1445 "dalvik_cache availible)%s.", odex_filename.c_str(), 1446 odex_error_msg.c_str(), relocation_msg.c_str()); 1447 } 1448 VLOG(class_linker) << error_msg; 1449 error_msgs->push_back(error_msg); 1450 } 1451 return ret; 1452} 1453 1454const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1455 InstructionSet isa, 1456 std::string* error_msg) { 1457 // We open it non-executable 1458 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, nullptr, false, error_msg)); 1459 if (output.get() == nullptr) { 1460 return nullptr; 1461 } 1462 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1463 VerifyOatImageChecksum(output.get(), isa)) { 1464 return output.release(); 1465 } else { 1466 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1467 oat_path.c_str()); 1468 return nullptr; 1469 } 1470} 1471 1472const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1473 const std::string& output_oat, 1474 const std::string& image_location, 1475 InstructionSet isa, 1476 std::string* error_msg) { 1477 Runtime* runtime = Runtime::Current(); 1478 DCHECK(runtime != nullptr); 1479 if (!runtime->GetHeap()->HasImageSpace()) { 1480 // We don't have an image space so there is no point in trying to patchoat. 1481 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1482 << "running without an image. Attempting to use oat file for interpretation."; 1483 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1484 } 1485 if (!runtime->IsDex2OatEnabled()) { 1486 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1487 // input_oat but make sure we only do interpretation on it's dex files. 1488 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1489 << "disabled. Attempting to use oat file for interpretation"; 1490 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1491 } 1492 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1493 std::string patchoat(runtime->GetPatchoatExecutable()); 1494 1495 std::string isa_arg("--instruction-set="); 1496 isa_arg += GetInstructionSetString(isa); 1497 std::string input_oat_filename_arg("--input-oat-file="); 1498 input_oat_filename_arg += input_oat; 1499 std::string output_oat_filename_arg("--output-oat-file="); 1500 output_oat_filename_arg += output_oat; 1501 std::string patched_image_arg("--patched-image-location="); 1502 patched_image_arg += image_location; 1503 1504 std::vector<std::string> argv; 1505 argv.push_back(patchoat); 1506 argv.push_back(isa_arg); 1507 argv.push_back(input_oat_filename_arg); 1508 argv.push_back(output_oat_filename_arg); 1509 argv.push_back(patched_image_arg); 1510 1511 std::string command_line(Join(argv, ' ')); 1512 LOG(INFO) << "Relocate Oat File: " << command_line; 1513 bool success = Exec(argv, error_msg); 1514 if (success) { 1515 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr, 1516 !runtime->IsAotCompiler(), error_msg)); 1517 bool checksum_verified = false; 1518 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1519 error_msg)) { 1520 return output.release(); 1521 } else if (output.get() != nullptr) { 1522 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1523 "but output file '%s' failed verifcation: %s", 1524 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1525 } else { 1526 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1527 "but was unable to open output file '%s': %s", 1528 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1529 } 1530 } else if (!runtime->IsAotCompiler()) { 1531 // patchoat failed which means we probably don't have enough room to place the output oat file, 1532 // instead of failing we should just run the interpreter from the dex files in the input oat. 1533 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1534 << "for interpretation. patchoat failure was: " << *error_msg; 1535 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1536 } else { 1537 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1538 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1539 error_msg->c_str()); 1540 } 1541 return nullptr; 1542} 1543 1544bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1545 bool* checksum_verified, 1546 std::string* error_msg) { 1547 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1548 if (image_space == nullptr) { 1549 *error_msg = "No image space present"; 1550 return false; 1551 } 1552 uint32_t real_image_checksum; 1553 void* real_image_oat_offset; 1554 int32_t real_patch_delta; 1555 if (isa == runtime->GetInstructionSet()) { 1556 const ImageHeader& image_header = image_space->GetImageHeader(); 1557 real_image_checksum = image_header.GetOatChecksum(); 1558 real_image_oat_offset = image_header.GetOatDataBegin(); 1559 real_patch_delta = image_header.GetPatchDelta(); 1560 } else { 1561 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1562 image_space->GetImageLocation().c_str(), isa)); 1563 real_image_checksum = image_header->GetOatChecksum(); 1564 real_image_oat_offset = image_header->GetOatDataBegin(); 1565 real_patch_delta = image_header->GetPatchDelta(); 1566 } 1567 1568 const OatHeader& oat_header = oat_file->GetOatHeader(); 1569 std::string compound_msg; 1570 1571 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1572 *checksum_verified = oat_image_checksum == real_image_checksum; 1573 if (!*checksum_verified) { 1574 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1575 real_image_checksum, oat_image_checksum); 1576 } 1577 1578 bool offset_verified; 1579 bool patch_delta_verified; 1580 1581 if (!oat_file->IsPic()) { 1582 // If an oat file is not PIC, we need to check that the image is at the expected location and 1583 // patched in the same way. 1584 void* oat_image_oat_offset = 1585 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1586 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1587 if (!offset_verified) { 1588 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1589 real_image_oat_offset, oat_image_oat_offset); 1590 } 1591 1592 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1593 patch_delta_verified = oat_patch_delta == real_patch_delta; 1594 if (!patch_delta_verified) { 1595 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, " 1596 "received 0x%x)", real_patch_delta, oat_patch_delta); 1597 } 1598 } else { 1599 // If an oat file is PIC, we ignore offset and patching delta. 1600 offset_verified = true; 1601 patch_delta_verified = true; 1602 } 1603 1604 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1605 if (!ret) { 1606 *error_msg = "Oat file failed to verify:" + compound_msg; 1607 } 1608 return ret; 1609} 1610 1611const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1612 std::string* error_msg) { 1613 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1614 if (oat_file != nullptr) { 1615 return oat_file; 1616 } 1617 return OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1618 !Runtime::Current()->IsAotCompiler(), error_msg); 1619} 1620 1621void ClassLinker::InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) { 1622 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1623 DCHECK(obj != nullptr); 1624 DCHECK(class_linker != nullptr); 1625 if (obj->IsArtMethod()) { 1626 mirror::ArtMethod* method = obj->AsArtMethod(); 1627 if (!method->IsNative()) { 1628 const size_t pointer_size = class_linker->image_pointer_size_; 1629 method->SetEntryPointFromInterpreterPtrSize(artInterpreterToInterpreterBridge, pointer_size); 1630 if (!method->IsRuntimeMethod() && method != Runtime::Current()->GetResolutionMethod()) { 1631 method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(), 1632 pointer_size); 1633 } 1634 } 1635 } 1636} 1637 1638void ClassLinker::InitFromImage() { 1639 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1640 CHECK(!init_done_); 1641 1642 Thread* self = Thread::Current(); 1643 gc::Heap* heap = Runtime::Current()->GetHeap(); 1644 gc::space::ImageSpace* space = heap->GetImageSpace(); 1645 dex_cache_image_class_lookup_required_ = true; 1646 CHECK(space != nullptr); 1647 OatFile& oat_file = GetImageOatFile(space); 1648 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1649 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1650 const char* image_file_location = oat_file.GetOatHeader(). 1651 GetStoreValueByKey(OatHeader::kImageLocationKey); 1652 CHECK(image_file_location == nullptr || *image_file_location == 0); 1653 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1654 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1655 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1656 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1657 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1658 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1659 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1660 1661 StackHandleScope<1> hs(self); 1662 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1663 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1664 AsObjectArray<mirror::Class>())); 1665 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1666 1667 // Special case of setting up the String class early so that we can test arbitrary objects 1668 // as being Strings or not 1669 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1670 1671 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1672 static_cast<uint32_t>(dex_caches->GetLength())); 1673 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1674 StackHandleScope<1> hs2(self); 1675 Handle<mirror::DexCache> dex_cache(hs2.NewHandle(dex_caches->Get(i))); 1676 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1677 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1678 nullptr); 1679 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1680 std::string error_msg; 1681 std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg); 1682 if (dex_file.get() == nullptr) { 1683 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1684 << " from within oat file " << oat_file.GetLocation() 1685 << " error '" << error_msg << "'"; 1686 UNREACHABLE(); 1687 } 1688 1689 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1690 1691 AppendToBootClassPath(*dex_file.get(), dex_cache); 1692 opened_dex_files_.push_back(std::move(dex_file)); 1693 } 1694 1695 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1696 // bitmap walk. 1697 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1698 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 1699 if (!Runtime::Current()->IsAotCompiler()) { 1700 // Aot compiler supports having an image with a different pointer size than the runtime. This 1701 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 1702 // also use 32 bit dex2oat on a system with 64 bit apps. 1703 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 1704 << sizeof(void*); 1705 } 1706 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 1707 image_pointer_size_ = 4; 1708 } else { 1709 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 1710 image_pointer_size_ = 8; 1711 } 1712 1713 // Set entry point to interpreter if in InterpretOnly mode. 1714 Runtime* runtime = Runtime::Current(); 1715 if (!runtime->IsAotCompiler() && runtime->GetInstrumentation()->InterpretOnly()) { 1716 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1717 } 1718 1719 // reinit class_roots_ 1720 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1721 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1722 1723 // reinit array_iftable_ from any array class instance, they should be == 1724 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1725 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1726 // String class root was set above 1727 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1728 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1729 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1730 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1731 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1732 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1733 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1734 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1735 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1736 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1737 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1738 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1739 1740 FinishInit(self); 1741 1742 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1743} 1744 1745void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1746 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1747 if ((flags & kVisitRootFlagAllRoots) != 0) { 1748 for (GcRoot<mirror::Class>& root : class_table_) { 1749 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1750 } 1751 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1752 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1753 } 1754 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1755 for (auto& root : new_class_roots_) { 1756 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 1757 root.VisitRoot(callback, arg, RootInfo(kRootStickyClass)); 1758 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 1759 if (UNLIKELY(new_ref != old_ref)) { 1760 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1761 // corresponding object. This is slow, but luckily for us, this may only happen with a 1762 // concurrent moving GC. 1763 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 1764 DCHECK(it != class_table_.end()); 1765 *it = GcRoot<mirror::Class>(new_ref); 1766 } 1767 } 1768 } 1769 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1770 new_class_roots_.clear(); 1771 } 1772 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1773 log_new_class_table_roots_ = true; 1774 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1775 log_new_class_table_roots_ = false; 1776 } 1777 // We deliberately ignore the class roots in the image since we 1778 // handle image roots by using the MS/CMS rescanning of dirty cards. 1779} 1780 1781// Keep in sync with InitCallback. Anything we visit, we need to 1782// reinit references to when reinitializing a ClassLinker from a 1783// mapped image. 1784void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1785 class_roots_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1786 Thread* self = Thread::Current(); 1787 { 1788 ReaderMutexLock mu(self, dex_lock_); 1789 if ((flags & kVisitRootFlagAllRoots) != 0) { 1790 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1791 dex_cache.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1792 } 1793 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1794 for (size_t index : new_dex_cache_roots_) { 1795 dex_caches_[index].VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1796 } 1797 } 1798 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1799 new_dex_cache_roots_.clear(); 1800 } 1801 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1802 log_new_dex_caches_roots_ = true; 1803 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1804 log_new_dex_caches_roots_ = false; 1805 } 1806 } 1807 VisitClassRoots(callback, arg, flags); 1808 array_iftable_.VisitRoot(callback, arg, RootInfo(kRootVMInternal)); 1809 DCHECK(!array_iftable_.IsNull()); 1810 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1811 find_array_class_cache_[i].VisitRootIfNonNull(callback, arg, RootInfo(kRootVMInternal)); 1812 } 1813} 1814 1815void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1816 if (dex_cache_image_class_lookup_required_) { 1817 MoveImageClassesToClassTable(); 1818 } 1819 // TODO: why isn't this a ReaderMutexLock? 1820 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1821 for (GcRoot<mirror::Class>& root : class_table_) { 1822 if (!visitor(root.Read(), arg)) { 1823 return; 1824 } 1825 } 1826 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1827 if (!visitor(root.Read(), arg)) { 1828 return; 1829 } 1830 } 1831} 1832 1833static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1834 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1835 classes->insert(c); 1836 return true; 1837} 1838 1839struct GetClassesVisitorArrayArg { 1840 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1841 int32_t index; 1842 bool success; 1843}; 1844 1845static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1846 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1847 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1848 if (arg->index < (*arg->classes)->GetLength()) { 1849 (*arg->classes)->Set(arg->index, c); 1850 arg->index++; 1851 return true; 1852 } else { 1853 arg->success = false; 1854 return false; 1855 } 1856} 1857 1858void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1859 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1860 // is avoiding duplicates. 1861 if (!kMovingClasses) { 1862 std::set<mirror::Class*> classes; 1863 VisitClasses(GetClassesVisitorSet, &classes); 1864 for (mirror::Class* klass : classes) { 1865 if (!visitor(klass, arg)) { 1866 return; 1867 } 1868 } 1869 } else { 1870 Thread* self = Thread::Current(); 1871 StackHandleScope<1> hs(self); 1872 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1873 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1874 GetClassesVisitorArrayArg local_arg; 1875 local_arg.classes = &classes; 1876 local_arg.success = false; 1877 // We size the array assuming classes won't be added to the class table during the visit. 1878 // If this assumption fails we iterate again. 1879 while (!local_arg.success) { 1880 size_t class_table_size; 1881 { 1882 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1883 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1884 } 1885 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1886 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1887 classes.Assign( 1888 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1889 CHECK(classes.Get() != nullptr); // OOME. 1890 local_arg.index = 0; 1891 local_arg.success = true; 1892 VisitClasses(GetClassesVisitorArray, &local_arg); 1893 } 1894 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1895 // If the class table shrank during creation of the clases array we expect null elements. If 1896 // the class table grew then the loop repeats. If classes are created after the loop has 1897 // finished then we don't visit. 1898 mirror::Class* klass = classes->Get(i); 1899 if (klass != nullptr && !visitor(klass, arg)) { 1900 return; 1901 } 1902 } 1903 } 1904} 1905 1906ClassLinker::~ClassLinker() { 1907 mirror::Class::ResetClass(); 1908 mirror::String::ResetClass(); 1909 mirror::Reference::ResetClass(); 1910 mirror::ArtField::ResetClass(); 1911 mirror::ArtMethod::ResetClass(); 1912 mirror::BooleanArray::ResetArrayClass(); 1913 mirror::ByteArray::ResetArrayClass(); 1914 mirror::CharArray::ResetArrayClass(); 1915 mirror::DoubleArray::ResetArrayClass(); 1916 mirror::FloatArray::ResetArrayClass(); 1917 mirror::IntArray::ResetArrayClass(); 1918 mirror::LongArray::ResetArrayClass(); 1919 mirror::ShortArray::ResetArrayClass(); 1920 mirror::Throwable::ResetClass(); 1921 mirror::StackTraceElement::ResetClass(); 1922 STLDeleteElements(&oat_files_); 1923} 1924 1925mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1926 gc::Heap* heap = Runtime::Current()->GetHeap(); 1927 StackHandleScope<16> hs(self); 1928 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1929 Handle<mirror::DexCache> dex_cache( 1930 hs.NewHandle(down_cast<mirror::DexCache*>( 1931 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1932 VoidFunctor())))); 1933 if (dex_cache.Get() == nullptr) { 1934 return nullptr; 1935 } 1936 Handle<mirror::String> 1937 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1938 if (location.Get() == nullptr) { 1939 return nullptr; 1940 } 1941 Handle<mirror::ObjectArray<mirror::String>> 1942 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1943 if (strings.Get() == nullptr) { 1944 return nullptr; 1945 } 1946 Handle<mirror::ObjectArray<mirror::Class>> 1947 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1948 if (types.Get() == nullptr) { 1949 return nullptr; 1950 } 1951 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1952 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1953 if (methods.Get() == nullptr) { 1954 return nullptr; 1955 } 1956 Handle<mirror::ObjectArray<mirror::ArtField>> 1957 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1958 if (fields.Get() == nullptr) { 1959 return nullptr; 1960 } 1961 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1962 fields.Get()); 1963 return dex_cache.Get(); 1964} 1965 1966mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1967 uint32_t class_size) { 1968 DCHECK_GE(class_size, sizeof(mirror::Class)); 1969 gc::Heap* heap = Runtime::Current()->GetHeap(); 1970 mirror::Class::InitializeClassVisitor visitor(class_size); 1971 mirror::Object* k = kMovingClasses ? 1972 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1973 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1974 if (UNLIKELY(k == nullptr)) { 1975 CHECK(self->IsExceptionPending()); // OOME. 1976 return nullptr; 1977 } 1978 return k->AsClass(); 1979} 1980 1981mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1982 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1983} 1984 1985mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1986 return down_cast<mirror::ArtField*>( 1987 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1988} 1989 1990mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1991 return down_cast<mirror::ArtMethod*>( 1992 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1993} 1994 1995mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1996 Thread* self, size_t length) { 1997 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1998 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1999} 2000 2001mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2002 mirror::Class* klass) { 2003 DCHECK(klass != nullptr); 2004 2005 // For temporary classes we must wait for them to be retired. 2006 if (init_done_ && klass->IsTemp()) { 2007 CHECK(!klass->IsResolved()); 2008 if (klass->IsErroneous()) { 2009 ThrowEarlierClassFailure(klass); 2010 return nullptr; 2011 } 2012 StackHandleScope<1> hs(self); 2013 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2014 ObjectLock<mirror::Class> lock(self, h_class); 2015 // Loop and wait for the resolving thread to retire this class. 2016 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2017 lock.WaitIgnoringInterrupts(); 2018 } 2019 if (h_class->IsErroneous()) { 2020 ThrowEarlierClassFailure(h_class.Get()); 2021 return nullptr; 2022 } 2023 CHECK(h_class->IsRetired()); 2024 // Get the updated class from class table. 2025 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor), 2026 h_class.Get()->GetClassLoader()); 2027 } 2028 2029 // Wait for the class if it has not already been linked. 2030 if (!klass->IsResolved() && !klass->IsErroneous()) { 2031 StackHandleScope<1> hs(self); 2032 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2033 ObjectLock<mirror::Class> lock(self, h_class); 2034 // Check for circular dependencies between classes. 2035 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2036 ThrowClassCircularityError(h_class.Get()); 2037 h_class->SetStatus(mirror::Class::kStatusError, self); 2038 return nullptr; 2039 } 2040 // Wait for the pending initialization to complete. 2041 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2042 lock.WaitIgnoringInterrupts(); 2043 } 2044 } 2045 2046 if (klass->IsErroneous()) { 2047 ThrowEarlierClassFailure(klass); 2048 return nullptr; 2049 } 2050 // Return the loaded class. No exceptions should be pending. 2051 CHECK(klass->IsResolved()) << PrettyClass(klass); 2052 self->AssertNoPendingException(); 2053 return klass; 2054} 2055 2056typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2057 2058// Search a collection of DexFiles for a descriptor 2059ClassPathEntry FindInClassPath(const char* descriptor, 2060 size_t hash, const std::vector<const DexFile*>& class_path) { 2061 for (const DexFile* dex_file : class_path) { 2062 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2063 if (dex_class_def != nullptr) { 2064 return ClassPathEntry(dex_file, dex_class_def); 2065 } 2066 } 2067 return ClassPathEntry(nullptr, nullptr); 2068} 2069 2070mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2071 Thread* self, const char* descriptor, 2072 size_t hash, 2073 Handle<mirror::ClassLoader> class_loader) { 2074 // Can we special case for a well understood PathClassLoader with the BootClassLoader as parent? 2075 if (class_loader->GetClass() != 2076 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2077 class_loader->GetParent()->GetClass() != 2078 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2079 return nullptr; 2080 } 2081 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2082 // Check if this would be found in the parent boot class loader. 2083 if (pair.second != nullptr) { 2084 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr); 2085 if (klass != nullptr) { 2086 // May return null if resolution on another thread fails. 2087 klass = EnsureResolved(self, descriptor, klass); 2088 } else { 2089 // May OOME. 2090 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2091 *pair.second); 2092 } 2093 if (klass == nullptr) { 2094 CHECK(self->IsExceptionPending()) << descriptor; 2095 self->ClearException(); 2096 } 2097 return klass; 2098 } else { 2099 // Handle as if this is the child PathClassLoader. 2100 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension). 2101 StackHandleScope<3> hs(self); 2102 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2103 // We need to get the DexPathList and loop through it. 2104 Handle<mirror::ArtField> cookie_field = 2105 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2106 Handle<mirror::ArtField> dex_file_field = 2107 hs.NewHandle( 2108 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2109 mirror::Object* dex_path_list = 2110 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2111 GetObject(class_loader.Get()); 2112 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2113 cookie_field.Get() != nullptr) { 2114 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2115 mirror::Object* dex_elements_obj = 2116 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2117 GetObject(dex_path_list); 2118 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2119 // at the mCookie which is a DexFile vector. 2120 if (dex_elements_obj != nullptr) { 2121 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2122 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2123 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2124 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2125 if (element == nullptr) { 2126 // Should never happen, fall back to java code to throw a NPE. 2127 break; 2128 } 2129 mirror::Object* dex_file = dex_file_field->GetObject(element); 2130 if (dex_file != nullptr) { 2131 const uint64_t cookie = cookie_field->GetLong(dex_file); 2132 auto* dex_files = 2133 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2134 if (dex_files == nullptr) { 2135 // This should never happen so log a warning. 2136 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2137 break; 2138 } 2139 for (const DexFile* cp_dex_file : *dex_files) { 2140 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash); 2141 if (dex_class_def != nullptr) { 2142 RegisterDexFile(*cp_dex_file); 2143 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, 2144 *cp_dex_file, *dex_class_def); 2145 if (klass == nullptr) { 2146 CHECK(self->IsExceptionPending()) << descriptor; 2147 self->ClearException(); 2148 return nullptr; 2149 } 2150 return klass; 2151 } 2152 } 2153 } 2154 } 2155 } 2156 } 2157 self->AssertNoPendingException(); 2158 return nullptr; 2159 } 2160} 2161 2162mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2163 Handle<mirror::ClassLoader> class_loader) { 2164 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2165 DCHECK(self != nullptr); 2166 self->AssertNoPendingException(); 2167 if (descriptor[1] == '\0') { 2168 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2169 // for primitive classes that aren't backed by dex files. 2170 return FindPrimitiveClass(descriptor[0]); 2171 } 2172 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 2173 // Find the class in the loaded classes table. 2174 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get()); 2175 if (klass != nullptr) { 2176 return EnsureResolved(self, descriptor, klass); 2177 } 2178 // Class is not yet loaded. 2179 if (descriptor[0] == '[') { 2180 return CreateArrayClass(self, descriptor, hash, class_loader); 2181 } else if (class_loader.Get() == nullptr) { 2182 // The boot class loader, search the boot class path. 2183 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2184 if (pair.second != nullptr) { 2185 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2186 *pair.second); 2187 } else { 2188 // The boot class loader is searched ahead of the application class loader, failures are 2189 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2190 // trigger the chaining with a proper stack trace. 2191 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2192 self->SetException(ThrowLocation(), pre_allocated); 2193 return nullptr; 2194 } 2195 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2196 // First try with the bootstrap class loader. 2197 if (class_loader.Get() != nullptr) { 2198 klass = LookupClass(self, descriptor, hash, nullptr); 2199 if (klass != nullptr) { 2200 return EnsureResolved(self, descriptor, klass); 2201 } 2202 } 2203 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2204 // a NoClassDefFoundError being allocated. 2205 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2206 if (pair.second != nullptr) { 2207 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2208 *pair.second); 2209 } 2210 // Next try the compile time class path. 2211 const std::vector<const DexFile*>* class_path; 2212 { 2213 ScopedObjectAccessUnchecked soa(self); 2214 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2215 soa.AddLocalReference<jobject>(class_loader.Get())); 2216 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2217 } 2218 pair = FindInClassPath(descriptor, hash, *class_path); 2219 if (pair.second != nullptr) { 2220 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 2221 } else { 2222 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2223 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2224 self->SetException(ThrowLocation(), pre_allocated); 2225 return nullptr; 2226 } 2227 } else { 2228 ScopedObjectAccessUnchecked soa(self); 2229 mirror::Class* cp_klass = FindClassInPathClassLoader(soa, self, descriptor, hash, 2230 class_loader); 2231 if (cp_klass != nullptr) { 2232 return cp_klass; 2233 } 2234 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2235 soa.AddLocalReference<jobject>(class_loader.Get())); 2236 std::string class_name_string(DescriptorToDot(descriptor)); 2237 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2238 { 2239 ScopedThreadStateChange tsc(self, kNative); 2240 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2241 soa.Env()->NewStringUTF(class_name_string.c_str())); 2242 if (class_name_object.get() == nullptr) { 2243 DCHECK(self->IsExceptionPending()); // OOME. 2244 return nullptr; 2245 } 2246 CHECK(class_loader_object.get() != nullptr); 2247 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2248 WellKnownClasses::java_lang_ClassLoader_loadClass, 2249 class_name_object.get())); 2250 } 2251 if (self->IsExceptionPending()) { 2252 // If the ClassLoader threw, pass that exception up. 2253 return nullptr; 2254 } else if (result.get() == nullptr) { 2255 // broken loader - throw NPE to be compatible with Dalvik 2256 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2257 class_name_string.c_str()).c_str()); 2258 return nullptr; 2259 } else { 2260 // success, return mirror::Class* 2261 return soa.Decode<mirror::Class*>(result.get()); 2262 } 2263 } 2264 UNREACHABLE(); 2265} 2266 2267mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 2268 Handle<mirror::ClassLoader> class_loader, 2269 const DexFile& dex_file, 2270 const DexFile::ClassDef& dex_class_def) { 2271 StackHandleScope<3> hs(self); 2272 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2273 2274 // Load the class from the dex file. 2275 if (UNLIKELY(!init_done_)) { 2276 // finish up init of hand crafted class_roots_ 2277 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2278 klass.Assign(GetClassRoot(kJavaLangObject)); 2279 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2280 klass.Assign(GetClassRoot(kJavaLangClass)); 2281 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2282 klass.Assign(GetClassRoot(kJavaLangString)); 2283 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2284 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2285 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2286 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2287 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2288 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2289 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2290 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2291 } 2292 } 2293 2294 if (klass.Get() == nullptr) { 2295 // Allocate a class with the status of not ready. 2296 // Interface object should get the right size here. Regular class will 2297 // figure out the right size later and be replaced with one of the right 2298 // size when the class becomes resolved. 2299 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2300 } 2301 if (UNLIKELY(klass.Get() == nullptr)) { 2302 CHECK(self->IsExceptionPending()); // Expect an OOME. 2303 return nullptr; 2304 } 2305 klass->SetDexCache(FindDexCache(dex_file)); 2306 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2307 ObjectLock<mirror::Class> lock(self, klass); 2308 if (self->IsExceptionPending()) { 2309 // An exception occured during load, set status to erroneous while holding klass' lock in case 2310 // notification is necessary. 2311 if (!klass->IsErroneous()) { 2312 klass->SetStatus(mirror::Class::kStatusError, self); 2313 } 2314 return nullptr; 2315 } 2316 klass->SetClinitThreadId(self->GetTid()); 2317 2318 // Add the newly loaded class to the loaded classes table. 2319 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 2320 if (existing != nullptr) { 2321 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2322 // this thread to block. 2323 return EnsureResolved(self, descriptor, existing); 2324 } 2325 2326 // Finish loading (if necessary) by finding parents 2327 CHECK(!klass->IsLoaded()); 2328 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2329 // Loading failed. 2330 if (!klass->IsErroneous()) { 2331 klass->SetStatus(mirror::Class::kStatusError, self); 2332 } 2333 return nullptr; 2334 } 2335 CHECK(klass->IsLoaded()); 2336 // Link the class (if necessary) 2337 CHECK(!klass->IsResolved()); 2338 // TODO: Use fast jobjects? 2339 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2340 2341 mirror::Class* new_class = nullptr; 2342 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2343 // Linking failed. 2344 if (!klass->IsErroneous()) { 2345 klass->SetStatus(mirror::Class::kStatusError, self); 2346 } 2347 return nullptr; 2348 } 2349 self->AssertNoPendingException(); 2350 CHECK(new_class != nullptr) << descriptor; 2351 CHECK(new_class->IsResolved()) << descriptor; 2352 2353 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2354 2355 // Instrumentation may have updated entrypoints for all methods of all 2356 // classes. However it could not update methods of this class while we 2357 // were loading it. Now the class is resolved, we can update entrypoints 2358 // as required by instrumentation. 2359 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 2360 // We must be in the kRunnable state to prevent instrumentation from 2361 // suspending all threads to update entrypoints while we are doing it 2362 // for this class. 2363 DCHECK_EQ(self->GetState(), kRunnable); 2364 Runtime::Current()->GetInstrumentation()->InstallStubsForClass(new_class_h.Get()); 2365 } 2366 2367 /* 2368 * We send CLASS_PREPARE events to the debugger from here. The 2369 * definition of "preparation" is creating the static fields for a 2370 * class and initializing them to the standard default values, but not 2371 * executing any code (that comes later, during "initialization"). 2372 * 2373 * We did the static preparation in LinkClass. 2374 * 2375 * The class has been prepared and resolved but possibly not yet verified 2376 * at this point. 2377 */ 2378 Dbg::PostClassPrepare(new_class_h.Get()); 2379 2380 return new_class_h.Get(); 2381} 2382 2383uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2384 const DexFile::ClassDef& dex_class_def) { 2385 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2386 size_t num_ref = 0; 2387 size_t num_8 = 0; 2388 size_t num_16 = 0; 2389 size_t num_32 = 0; 2390 size_t num_64 = 0; 2391 if (class_data != nullptr) { 2392 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2393 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2394 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2395 char c = descriptor[0]; 2396 switch (c) { 2397 case 'L': 2398 case '[': 2399 num_ref++; 2400 break; 2401 case 'J': 2402 case 'D': 2403 num_64++; 2404 break; 2405 case 'I': 2406 case 'F': 2407 num_32++; 2408 break; 2409 case 'S': 2410 case 'C': 2411 num_16++; 2412 break; 2413 case 'B': 2414 case 'Z': 2415 num_8++; 2416 break; 2417 default: 2418 LOG(FATAL) << "Unknown descriptor: " << c; 2419 UNREACHABLE(); 2420 } 2421 } 2422 } 2423 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2424} 2425 2426OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2427 bool* found) { 2428 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2429 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2430 if (oat_dex_file == nullptr) { 2431 *found = false; 2432 return OatFile::OatClass::Invalid(); 2433 } 2434 *found = true; 2435 return oat_dex_file->GetOatClass(class_def_idx); 2436} 2437 2438static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2439 uint32_t method_idx) { 2440 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2441 const uint8_t* class_data = dex_file.GetClassData(class_def); 2442 CHECK(class_data != nullptr); 2443 ClassDataItemIterator it(dex_file, class_data); 2444 // Skip fields 2445 while (it.HasNextStaticField()) { 2446 it.Next(); 2447 } 2448 while (it.HasNextInstanceField()) { 2449 it.Next(); 2450 } 2451 // Process methods 2452 size_t class_def_method_index = 0; 2453 while (it.HasNextDirectMethod()) { 2454 if (it.GetMemberIndex() == method_idx) { 2455 return class_def_method_index; 2456 } 2457 class_def_method_index++; 2458 it.Next(); 2459 } 2460 while (it.HasNextVirtualMethod()) { 2461 if (it.GetMemberIndex() == method_idx) { 2462 return class_def_method_index; 2463 } 2464 class_def_method_index++; 2465 it.Next(); 2466 } 2467 DCHECK(!it.HasNext()); 2468 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2469 UNREACHABLE(); 2470} 2471 2472const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2473 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2474 // method for direct methods (or virtual methods made direct). 2475 mirror::Class* declaring_class = method->GetDeclaringClass(); 2476 size_t oat_method_index; 2477 if (method->IsStatic() || method->IsDirect()) { 2478 // Simple case where the oat method index was stashed at load time. 2479 oat_method_index = method->GetMethodIndex(); 2480 } else { 2481 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2482 // by search for its position in the declared virtual methods. 2483 oat_method_index = declaring_class->NumDirectMethods(); 2484 size_t end = declaring_class->NumVirtualMethods(); 2485 bool found_virtual = false; 2486 for (size_t i = 0; i < end; i++) { 2487 // Check method index instead of identity in case of duplicate method definitions. 2488 if (method->GetDexMethodIndex() == 2489 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2490 found_virtual = true; 2491 break; 2492 } 2493 oat_method_index++; 2494 } 2495 CHECK(found_virtual) << "Didn't find oat method index for virtual method: " 2496 << PrettyMethod(method); 2497 } 2498 DCHECK_EQ(oat_method_index, 2499 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2500 method->GetDeclaringClass()->GetDexClassDefIndex(), 2501 method->GetDexMethodIndex())); 2502 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2503 declaring_class->GetDexClassDefIndex(), 2504 found); 2505 if (!(*found)) { 2506 return OatFile::OatMethod::Invalid(); 2507 } 2508 return oat_class.GetOatMethod(oat_method_index); 2509} 2510 2511// Special case to get oat code without overwriting a trampoline. 2512const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2513 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2514 if (method->IsProxyMethod()) { 2515 return GetQuickProxyInvokeHandler(); 2516 } 2517 bool found; 2518 jit::Jit* const jit = Runtime::Current()->GetJit(); 2519 if (jit != nullptr) { 2520 auto* code = jit->GetCodeCache()->GetCodeFor(method); 2521 if (code != nullptr) { 2522 return code; 2523 } 2524 } 2525 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2526 if (found) { 2527 auto* code = oat_method.GetQuickCode(); 2528 if (code != nullptr) { 2529 return code; 2530 } 2531 } 2532 if (method->IsNative()) { 2533 // No code and native? Use generic trampoline. 2534 return GetQuickGenericJniStub(); 2535 } 2536 return GetQuickToInterpreterBridge(); 2537} 2538 2539const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2540 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2541 return nullptr; 2542 } 2543 jit::Jit* jit = Runtime::Current()->GetJit(); 2544 if (jit != nullptr) { 2545 auto* code = jit->GetCodeCache()->GetCodeFor(method); 2546 if (code != nullptr) { 2547 return code; 2548 } 2549 } 2550 bool found; 2551 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2552 if (found) { 2553 return oat_method.GetQuickCode(); 2554 } 2555 return nullptr; 2556} 2557 2558const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2559 uint32_t method_idx) { 2560 bool found; 2561 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2562 if (!found) { 2563 return nullptr; 2564 } 2565 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2566 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2567} 2568 2569// Returns true if the method must run with interpreter, false otherwise. 2570static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code) 2571 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2572 if (quick_code == nullptr) { 2573 // No code: need interpreter. 2574 // May return true for native code, in the case of generic JNI 2575 // DCHECK(!method->IsNative()); 2576 return true; 2577 } 2578 // If interpreter mode is enabled, every method (except native and proxy) must 2579 // be run with interpreter. 2580 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2581 !method->IsNative() && !method->IsProxyMethod(); 2582} 2583 2584void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2585 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2586 if (klass->NumDirectMethods() == 0) { 2587 return; // No direct methods => no static methods. 2588 } 2589 Runtime* runtime = Runtime::Current(); 2590 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2591 if (runtime->IsAotCompiler() || runtime->GetHeap()->HasImageSpace()) { 2592 return; // OAT file unavailable. 2593 } 2594 } 2595 2596 const DexFile& dex_file = klass->GetDexFile(); 2597 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2598 CHECK(dex_class_def != nullptr); 2599 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2600 // There should always be class data if there were direct methods. 2601 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2602 ClassDataItemIterator it(dex_file, class_data); 2603 // Skip fields 2604 while (it.HasNextStaticField()) { 2605 it.Next(); 2606 } 2607 while (it.HasNextInstanceField()) { 2608 it.Next(); 2609 } 2610 bool has_oat_class; 2611 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2612 &has_oat_class); 2613 // Link the code of methods skipped by LinkCode. 2614 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2615 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2616 if (!method->IsStatic()) { 2617 // Only update static methods. 2618 continue; 2619 } 2620 const void* quick_code = nullptr; 2621 if (has_oat_class) { 2622 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2623 quick_code = oat_method.GetQuickCode(); 2624 } 2625 const bool enter_interpreter = NeedsInterpreter(method, quick_code); 2626 if (enter_interpreter) { 2627 // Use interpreter entry point. 2628 // Check whether the method is native, in which case it's generic JNI. 2629 if (quick_code == nullptr && method->IsNative()) { 2630 quick_code = GetQuickGenericJniStub(); 2631 } else { 2632 quick_code = GetQuickToInterpreterBridge(); 2633 } 2634 } 2635 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code); 2636 } 2637 // Ignore virtual methods on the iterator. 2638} 2639 2640void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2641 const OatFile::OatClass* oat_class, 2642 uint32_t class_def_method_index) { 2643 Runtime* runtime = Runtime::Current(); 2644 if (runtime->IsAotCompiler()) { 2645 // The following code only applies to a non-compiler runtime. 2646 return; 2647 } 2648 // Method shouldn't have already been linked. 2649 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2650 if (oat_class != nullptr) { 2651 // Every kind of method should at least get an invoke stub from the oat_method. 2652 // non-abstract methods also get their code pointers. 2653 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index); 2654 oat_method.LinkMethod(method.Get()); 2655 } 2656 2657 // Install entry point from interpreter. 2658 bool enter_interpreter = NeedsInterpreter(method.Get(), 2659 method->GetEntryPointFromQuickCompiledCode()); 2660 if (enter_interpreter && !method->IsNative()) { 2661 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2662 } else { 2663 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2664 } 2665 2666 if (method->IsAbstract()) { 2667 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2668 return; 2669 } 2670 2671 if (method->IsStatic() && !method->IsConstructor()) { 2672 // For static methods excluding the class initializer, install the trampoline. 2673 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2674 // after initializing class (see ClassLinker::InitializeClass method). 2675 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2676 } else if (enter_interpreter) { 2677 if (!method->IsNative()) { 2678 // Set entry point from compiled code if there's no code or in interpreter only mode. 2679 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2680 } else { 2681 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2682 } 2683 } 2684 2685 if (method->IsNative()) { 2686 // Unregistering restores the dlsym lookup stub. 2687 method->UnregisterNative(); 2688 2689 if (enter_interpreter) { 2690 // We have a native method here without code. Then it should have either the generic JNI 2691 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2692 // TODO: this doesn't handle all the cases where trampolines may be installed. 2693 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2694 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2695 } 2696 } 2697} 2698 2699 2700 2701void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2702 const DexFile::ClassDef& dex_class_def, 2703 Handle<mirror::Class> klass, 2704 mirror::ClassLoader* class_loader) { 2705 CHECK(klass.Get() != nullptr); 2706 CHECK(klass->GetDexCache() != nullptr); 2707 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2708 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2709 CHECK(descriptor != nullptr); 2710 2711 klass->SetClass(GetClassRoot(kJavaLangClass)); 2712 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2713 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2714 klass->SetAccessFlags(access_flags); 2715 klass->SetClassLoader(class_loader); 2716 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2717 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2718 2719 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2720 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2721 CHECK(klass->GetDexCacheStrings() != nullptr); 2722 2723 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2724 if (class_data == nullptr) { 2725 return; // no fields or methods - for example a marker interface 2726 } 2727 2728 2729 bool has_oat_class = false; 2730 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2731 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2732 &has_oat_class); 2733 if (has_oat_class) { 2734 LoadClassMembers(self, dex_file, class_data, klass, &oat_class); 2735 } 2736 } 2737 if (!has_oat_class) { 2738 LoadClassMembers(self, dex_file, class_data, klass, nullptr); 2739 } 2740} 2741 2742void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2743 const uint8_t* class_data, 2744 Handle<mirror::Class> klass, 2745 const OatFile::OatClass* oat_class) { 2746 // Load fields. 2747 ClassDataItemIterator it(dex_file, class_data); 2748 if (it.NumStaticFields() != 0) { 2749 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2750 if (UNLIKELY(statics == nullptr)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return; 2753 } 2754 klass->SetSFields(statics); 2755 } 2756 if (it.NumInstanceFields() != 0) { 2757 mirror::ObjectArray<mirror::ArtField>* fields = 2758 AllocArtFieldArray(self, it.NumInstanceFields()); 2759 if (UNLIKELY(fields == nullptr)) { 2760 CHECK(self->IsExceptionPending()); // OOME. 2761 return; 2762 } 2763 klass->SetIFields(fields); 2764 } 2765 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2766 self->AllowThreadSuspension(); 2767 StackHandleScope<1> hs(self); 2768 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2769 if (UNLIKELY(sfield.Get() == nullptr)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return; 2772 } 2773 klass->SetStaticField(i, sfield.Get()); 2774 LoadField(dex_file, it, klass, sfield); 2775 } 2776 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2777 self->AllowThreadSuspension(); 2778 StackHandleScope<1> hs(self); 2779 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2780 if (UNLIKELY(ifield.Get() == nullptr)) { 2781 CHECK(self->IsExceptionPending()); // OOME. 2782 return; 2783 } 2784 klass->SetInstanceField(i, ifield.Get()); 2785 LoadField(dex_file, it, klass, ifield); 2786 } 2787 2788 // Load methods. 2789 if (it.NumDirectMethods() != 0) { 2790 // TODO: append direct methods to class object 2791 mirror::ObjectArray<mirror::ArtMethod>* directs = 2792 AllocArtMethodArray(self, it.NumDirectMethods()); 2793 if (UNLIKELY(directs == nullptr)) { 2794 CHECK(self->IsExceptionPending()); // OOME. 2795 return; 2796 } 2797 klass->SetDirectMethods(directs); 2798 } 2799 if (it.NumVirtualMethods() != 0) { 2800 // TODO: append direct methods to class object 2801 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2802 AllocArtMethodArray(self, it.NumVirtualMethods()); 2803 if (UNLIKELY(virtuals == nullptr)) { 2804 CHECK(self->IsExceptionPending()); // OOME. 2805 return; 2806 } 2807 klass->SetVirtualMethods(virtuals); 2808 } 2809 size_t class_def_method_index = 0; 2810 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2811 size_t last_class_def_method_index = 0; 2812 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2813 self->AllowThreadSuspension(); 2814 StackHandleScope<1> hs(self); 2815 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2816 if (UNLIKELY(method.Get() == nullptr)) { 2817 CHECK(self->IsExceptionPending()); // OOME. 2818 return; 2819 } 2820 klass->SetDirectMethod(i, method.Get()); 2821 LinkCode(method, oat_class, class_def_method_index); 2822 uint32_t it_method_index = it.GetMemberIndex(); 2823 if (last_dex_method_index == it_method_index) { 2824 // duplicate case 2825 method->SetMethodIndex(last_class_def_method_index); 2826 } else { 2827 method->SetMethodIndex(class_def_method_index); 2828 last_dex_method_index = it_method_index; 2829 last_class_def_method_index = class_def_method_index; 2830 } 2831 class_def_method_index++; 2832 } 2833 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2834 self->AllowThreadSuspension(); 2835 StackHandleScope<1> hs(self); 2836 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2837 if (UNLIKELY(method.Get() == nullptr)) { 2838 CHECK(self->IsExceptionPending()); // OOME. 2839 return; 2840 } 2841 klass->SetVirtualMethod(i, method.Get()); 2842 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2843 LinkCode(method, oat_class, class_def_method_index); 2844 class_def_method_index++; 2845 } 2846 DCHECK(!it.HasNext()); 2847} 2848 2849void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2850 Handle<mirror::Class> klass, 2851 Handle<mirror::ArtField> dst) { 2852 uint32_t field_idx = it.GetMemberIndex(); 2853 dst->SetDexFieldIndex(field_idx); 2854 dst->SetDeclaringClass(klass.Get()); 2855 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2856} 2857 2858mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2859 const ClassDataItemIterator& it, 2860 Handle<mirror::Class> klass) { 2861 uint32_t dex_method_idx = it.GetMemberIndex(); 2862 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2863 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2864 2865 mirror::ArtMethod* dst = AllocArtMethod(self); 2866 if (UNLIKELY(dst == nullptr)) { 2867 CHECK(self->IsExceptionPending()); // OOME. 2868 return nullptr; 2869 } 2870 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2871 2872 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2873 dst->SetDexMethodIndex(dex_method_idx); 2874 dst->SetDeclaringClass(klass.Get()); 2875 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2876 2877 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2878 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2879 2880 uint32_t access_flags = it.GetMethodAccessFlags(); 2881 2882 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2883 // Set finalizable flag on declaring class. 2884 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2885 // Void return type. 2886 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2887 klass->SetFinalizable(); 2888 } else { 2889 std::string temp; 2890 const char* klass_descriptor = klass->GetDescriptor(&temp); 2891 // The Enum class declares a "final" finalize() method to prevent subclasses from 2892 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2893 // subclasses, so we exclude it here. 2894 // We also want to avoid setting the flag on Object, where we know that finalize() is 2895 // empty. 2896 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2897 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2898 klass->SetFinalizable(); 2899 } 2900 } 2901 } 2902 } else if (method_name[0] == '<') { 2903 // Fix broken access flags for initializers. Bug 11157540. 2904 bool is_init = (strcmp("<init>", method_name) == 0); 2905 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2906 if (UNLIKELY(!is_init && !is_clinit)) { 2907 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2908 } else { 2909 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2910 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2911 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2912 access_flags |= kAccConstructor; 2913 } 2914 } 2915 } 2916 dst->SetAccessFlags(access_flags); 2917 2918 return dst; 2919} 2920 2921void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2922 StackHandleScope<1> hs(self); 2923 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2924 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2925 << dex_file.GetLocation(); 2926 AppendToBootClassPath(dex_file, dex_cache); 2927} 2928 2929void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2930 Handle<mirror::DexCache> dex_cache) { 2931 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2932 boot_class_path_.push_back(&dex_file); 2933 RegisterDexFile(dex_file, dex_cache); 2934} 2935 2936bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2937 dex_lock_.AssertSharedHeld(Thread::Current()); 2938 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2939 mirror::DexCache* dex_cache = GetDexCache(i); 2940 if (dex_cache->GetDexFile() == &dex_file) { 2941 return true; 2942 } 2943 } 2944 return false; 2945} 2946 2947bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2948 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2949 return IsDexFileRegisteredLocked(dex_file); 2950} 2951 2952void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2953 Handle<mirror::DexCache> dex_cache) { 2954 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2955 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2956 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2957 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2958 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2959 dex_cache->SetDexFile(&dex_file); 2960 if (log_new_dex_caches_roots_) { 2961 // TODO: This is not safe if we can remove dex caches. 2962 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2963 } 2964} 2965 2966void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2967 Thread* self = Thread::Current(); 2968 { 2969 ReaderMutexLock mu(self, dex_lock_); 2970 if (IsDexFileRegisteredLocked(dex_file)) { 2971 return; 2972 } 2973 } 2974 // Don't alloc while holding the lock, since allocation may need to 2975 // suspend all threads and another thread may need the dex_lock_ to 2976 // get to a suspend point. 2977 StackHandleScope<1> hs(self); 2978 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2979 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2980 << dex_file.GetLocation(); 2981 { 2982 WriterMutexLock mu(self, dex_lock_); 2983 if (IsDexFileRegisteredLocked(dex_file)) { 2984 return; 2985 } 2986 RegisterDexFileLocked(dex_file, dex_cache); 2987 } 2988} 2989 2990void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2991 Handle<mirror::DexCache> dex_cache) { 2992 WriterMutexLock mu(Thread::Current(), dex_lock_); 2993 RegisterDexFileLocked(dex_file, dex_cache); 2994} 2995 2996mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2997 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2998 // Search assuming unique-ness of dex file. 2999 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3000 mirror::DexCache* dex_cache = GetDexCache(i); 3001 if (dex_cache->GetDexFile() == &dex_file) { 3002 return dex_cache; 3003 } 3004 } 3005 // Search matching by location name. 3006 std::string location(dex_file.GetLocation()); 3007 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3008 mirror::DexCache* dex_cache = GetDexCache(i); 3009 if (dex_cache->GetDexFile()->GetLocation() == location) { 3010 return dex_cache; 3011 } 3012 } 3013 // Failure, dump diagnostic and abort. 3014 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3015 mirror::DexCache* dex_cache = GetDexCache(i); 3016 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3017 } 3018 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3019 UNREACHABLE(); 3020} 3021 3022void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3023 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3024 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3025 mirror::DexCache* dex_cache = GetDexCache(i); 3026 dex_cache->Fixup(resolution_method); 3027 } 3028} 3029 3030mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3031 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3032 if (UNLIKELY(klass == nullptr)) { 3033 return nullptr; 3034 } 3035 return InitializePrimitiveClass(klass, type); 3036} 3037 3038mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3039 Primitive::Type type) { 3040 CHECK(primitive_class != nullptr); 3041 // Must hold lock on object when initializing. 3042 Thread* self = Thread::Current(); 3043 StackHandleScope<1> hs(self); 3044 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3045 ObjectLock<mirror::Class> lock(self, h_class); 3046 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3047 primitive_class->SetPrimitiveType(type); 3048 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3049 const char* descriptor = Primitive::Descriptor(type); 3050 mirror::Class* existing = InsertClass(descriptor, primitive_class, 3051 ComputeModifiedUtf8Hash(descriptor)); 3052 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3053 return primitive_class; 3054} 3055 3056// Create an array class (i.e. the class object for the array, not the 3057// array itself). "descriptor" looks like "[C" or "[[[[B" or 3058// "[Ljava/lang/String;". 3059// 3060// If "descriptor" refers to an array of primitives, look up the 3061// primitive type's internally-generated class object. 3062// 3063// "class_loader" is the class loader of the class that's referring to 3064// us. It's used to ensure that we're looking for the element type in 3065// the right context. It does NOT become the class loader for the 3066// array class; that always comes from the base element class. 3067// 3068// Returns nullptr with an exception raised on failure. 3069mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 3070 Handle<mirror::ClassLoader> class_loader) { 3071 // Identify the underlying component type 3072 CHECK_EQ('[', descriptor[0]); 3073 StackHandleScope<2> hs(self); 3074 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3075 class_loader))); 3076 if (component_type.Get() == nullptr) { 3077 DCHECK(self->IsExceptionPending()); 3078 // We need to accept erroneous classes as component types. 3079 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 3080 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get())); 3081 if (component_type.Get() == nullptr) { 3082 DCHECK(self->IsExceptionPending()); 3083 return nullptr; 3084 } else { 3085 self->ClearException(); 3086 } 3087 } 3088 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3089 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3090 return nullptr; 3091 } 3092 // See if the component type is already loaded. Array classes are 3093 // always associated with the class loader of their underlying 3094 // element type -- an array of Strings goes with the loader for 3095 // java/lang/String -- so we need to look for it there. (The 3096 // caller should have checked for the existence of the class 3097 // before calling here, but they did so with *their* class loader, 3098 // not the component type's loader.) 3099 // 3100 // If we find it, the caller adds "loader" to the class' initiating 3101 // loader list, which should prevent us from going through this again. 3102 // 3103 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3104 // are the same, because our caller (FindClass) just did the 3105 // lookup. (Even if we get this wrong we still have correct behavior, 3106 // because we effectively do this lookup again when we add the new 3107 // class to the hash table --- necessary because of possible races with 3108 // other threads.) 3109 if (class_loader.Get() != component_type->GetClassLoader()) { 3110 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader()); 3111 if (new_class != nullptr) { 3112 return new_class; 3113 } 3114 } 3115 3116 // Fill out the fields in the Class. 3117 // 3118 // It is possible to execute some methods against arrays, because 3119 // all arrays are subclasses of java_lang_Object_, so we need to set 3120 // up a vtable. We can just point at the one in java_lang_Object_. 3121 // 3122 // Array classes are simple enough that we don't need to do a full 3123 // link step. 3124 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3125 if (UNLIKELY(!init_done_)) { 3126 // Classes that were hand created, ie not by FindSystemClass 3127 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3128 new_class.Assign(GetClassRoot(kClassArrayClass)); 3129 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3130 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3131 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3132 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3133 } else if (strcmp(descriptor, 3134 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3135 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3136 } else if (strcmp(descriptor, 3137 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3138 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3139 } else if (strcmp(descriptor, "[C") == 0) { 3140 new_class.Assign(GetClassRoot(kCharArrayClass)); 3141 } else if (strcmp(descriptor, "[I") == 0) { 3142 new_class.Assign(GetClassRoot(kIntArrayClass)); 3143 } 3144 } 3145 if (new_class.Get() == nullptr) { 3146 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3147 if (new_class.Get() == nullptr) { 3148 return nullptr; 3149 } 3150 new_class->SetComponentType(component_type.Get()); 3151 } 3152 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3153 DCHECK(new_class->GetComponentType() != nullptr); 3154 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3155 new_class->SetSuperClass(java_lang_Object); 3156 new_class->SetVTable(java_lang_Object->GetVTable()); 3157 new_class->SetPrimitiveType(Primitive::kPrimNot); 3158 new_class->SetClassLoader(component_type->GetClassLoader()); 3159 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3160 { 3161 StackHandleScope<mirror::Class::kImtSize> hs2(self, 3162 Runtime::Current()->GetImtUnimplementedMethod()); 3163 new_class->PopulateEmbeddedImtAndVTable(&hs2); 3164 } 3165 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3166 // don't need to set new_class->SetObjectSize(..) 3167 // because Object::SizeOf delegates to Array::SizeOf 3168 3169 3170 // All arrays have java/lang/Cloneable and java/io/Serializable as 3171 // interfaces. We need to set that up here, so that stuff like 3172 // "instanceof" works right. 3173 // 3174 // Note: The GC could run during the call to FindSystemClass, 3175 // so we need to make sure the class object is GC-valid while we're in 3176 // there. Do this by clearing the interface list so the GC will just 3177 // think that the entries are null. 3178 3179 3180 // Use the single, global copies of "interfaces" and "iftable" 3181 // (remember not to free them for arrays). 3182 { 3183 mirror::IfTable* array_iftable = array_iftable_.Read(); 3184 CHECK(array_iftable != nullptr); 3185 new_class->SetIfTable(array_iftable); 3186 } 3187 3188 // Inherit access flags from the component type. 3189 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3190 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3191 access_flags &= kAccJavaFlagsMask; 3192 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3193 // and remove "interface". 3194 access_flags |= kAccAbstract | kAccFinal; 3195 access_flags &= ~kAccInterface; 3196 3197 new_class->SetAccessFlags(access_flags); 3198 3199 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 3200 if (existing == nullptr) { 3201 return new_class.Get(); 3202 } 3203 // Another thread must have loaded the class after we 3204 // started but before we finished. Abandon what we've 3205 // done. 3206 // 3207 // (Yes, this happens.) 3208 3209 return existing; 3210} 3211 3212mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3213 switch (type) { 3214 case 'B': 3215 return GetClassRoot(kPrimitiveByte); 3216 case 'C': 3217 return GetClassRoot(kPrimitiveChar); 3218 case 'D': 3219 return GetClassRoot(kPrimitiveDouble); 3220 case 'F': 3221 return GetClassRoot(kPrimitiveFloat); 3222 case 'I': 3223 return GetClassRoot(kPrimitiveInt); 3224 case 'J': 3225 return GetClassRoot(kPrimitiveLong); 3226 case 'S': 3227 return GetClassRoot(kPrimitiveShort); 3228 case 'Z': 3229 return GetClassRoot(kPrimitiveBoolean); 3230 case 'V': 3231 return GetClassRoot(kPrimitiveVoid); 3232 default: 3233 break; 3234 } 3235 std::string printable_type(PrintableChar(type)); 3236 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3237 return nullptr; 3238} 3239 3240mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3241 size_t hash) { 3242 if (VLOG_IS_ON(class_linker)) { 3243 mirror::DexCache* dex_cache = klass->GetDexCache(); 3244 std::string source; 3245 if (dex_cache != nullptr) { 3246 source += " from "; 3247 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3248 } 3249 LOG(INFO) << "Loaded class " << descriptor << source; 3250 } 3251 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3252 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3253 if (existing != nullptr) { 3254 return existing; 3255 } 3256 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3257 dex_cache_image_class_lookup_required_) { 3258 // Check a class loaded with the system class loader matches one in the image if the class 3259 // is in the image. 3260 existing = LookupClassFromImage(descriptor); 3261 if (existing != nullptr) { 3262 CHECK_EQ(klass, existing); 3263 } 3264 } 3265 VerifyObject(klass); 3266 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 3267 if (log_new_class_table_roots_) { 3268 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3269 } 3270 return nullptr; 3271} 3272 3273mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3274 size_t hash) { 3275 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3276 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 3277 hash); 3278 if (existing_it == class_table_.end()) { 3279 CHECK(klass->IsProxyClass()); 3280 return nullptr; 3281 } 3282 3283 mirror::Class* existing = existing_it->Read(); 3284 CHECK_NE(existing, klass) << descriptor; 3285 CHECK(!existing->IsResolved()) << descriptor; 3286 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3287 3288 CHECK(!klass->IsTemp()) << descriptor; 3289 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3290 dex_cache_image_class_lookup_required_) { 3291 // Check a class loaded with the system class loader matches one in the image if the class 3292 // is in the image. 3293 existing = LookupClassFromImage(descriptor); 3294 if (existing != nullptr) { 3295 CHECK_EQ(klass, existing) << descriptor; 3296 } 3297 } 3298 VerifyObject(klass); 3299 3300 // Update the element in the hash set. 3301 *existing_it = GcRoot<mirror::Class>(klass); 3302 if (log_new_class_table_roots_) { 3303 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3304 } 3305 3306 return existing; 3307} 3308 3309bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 3310 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3311 auto pair = std::make_pair(descriptor, class_loader); 3312 auto it = class_table_.Find(pair); 3313 if (it != class_table_.end()) { 3314 class_table_.Erase(it); 3315 return true; 3316 } 3317 it = pre_zygote_class_table_.Find(pair); 3318 if (it != pre_zygote_class_table_.end()) { 3319 pre_zygote_class_table_.Erase(it); 3320 return true; 3321 } 3322 return false; 3323} 3324 3325mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, size_t hash, 3326 mirror::ClassLoader* class_loader) { 3327 { 3328 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3329 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3330 if (result != nullptr) { 3331 return result; 3332 } 3333 } 3334 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3335 return nullptr; 3336 } else { 3337 // Lookup failed but need to search dex_caches_. 3338 mirror::Class* result = LookupClassFromImage(descriptor); 3339 if (result != nullptr) { 3340 InsertClass(descriptor, result, hash); 3341 } else { 3342 // Searching the image dex files/caches failed, we don't want to get into this situation 3343 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3344 // classes into the class table. 3345 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3346 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3347 MoveImageClassesToClassTable(); 3348 } 3349 } 3350 return result; 3351 } 3352} 3353 3354mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3355 mirror::ClassLoader* class_loader, 3356 size_t hash) { 3357 auto descriptor_pair = std::make_pair(descriptor, class_loader); 3358 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 3359 if (it == pre_zygote_class_table_.end()) { 3360 it = class_table_.FindWithHash(descriptor_pair, hash); 3361 if (it == class_table_.end()) { 3362 return nullptr; 3363 } 3364 } 3365 return it->Read(); 3366} 3367 3368static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3369 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3370 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3371 CHECK(image != nullptr); 3372 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3373 return root->AsObjectArray<mirror::DexCache>(); 3374} 3375 3376void ClassLinker::MoveImageClassesToClassTable() { 3377 Thread* self = Thread::Current(); 3378 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3379 if (!dex_cache_image_class_lookup_required_) { 3380 return; // All dex cache classes are already in the class table. 3381 } 3382 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3383 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3384 std::string temp; 3385 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3386 mirror::DexCache* dex_cache = dex_caches->Get(i); 3387 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3388 for (int32_t j = 0; j < types->GetLength(); j++) { 3389 mirror::Class* klass = types->Get(j); 3390 if (klass != nullptr) { 3391 DCHECK(klass->GetClassLoader() == nullptr); 3392 const char* descriptor = klass->GetDescriptor(&temp); 3393 size_t hash = ComputeModifiedUtf8Hash(descriptor); 3394 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3395 if (existing != nullptr) { 3396 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 3397 << PrettyClassAndClassLoader(klass); 3398 } else { 3399 class_table_.Insert(GcRoot<mirror::Class>(klass)); 3400 if (log_new_class_table_roots_) { 3401 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3402 } 3403 } 3404 } 3405 } 3406 } 3407 dex_cache_image_class_lookup_required_ = false; 3408} 3409 3410void ClassLinker::MoveClassTableToPreZygote() { 3411 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3412 DCHECK(pre_zygote_class_table_.Empty()); 3413 pre_zygote_class_table_ = std::move(class_table_); 3414 class_table_.Clear(); 3415} 3416 3417mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3418 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3419 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3420 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3421 mirror::DexCache* dex_cache = dex_caches->Get(i); 3422 const DexFile* dex_file = dex_cache->GetDexFile(); 3423 // Try binary searching the string/type index. 3424 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3425 if (string_id != nullptr) { 3426 const DexFile::TypeId* type_id = 3427 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3428 if (type_id != nullptr) { 3429 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3430 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3431 if (klass != nullptr) { 3432 return klass; 3433 } 3434 } 3435 } 3436 } 3437 return nullptr; 3438} 3439 3440void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3441 result.clear(); 3442 if (dex_cache_image_class_lookup_required_) { 3443 MoveImageClassesToClassTable(); 3444 } 3445 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3446 while (true) { 3447 auto it = class_table_.Find(descriptor); 3448 if (it == class_table_.end()) { 3449 break; 3450 } 3451 result.push_back(it->Read()); 3452 class_table_.Erase(it); 3453 } 3454 for (mirror::Class* k : result) { 3455 class_table_.Insert(GcRoot<mirror::Class>(k)); 3456 } 3457 size_t pre_zygote_start = result.size(); 3458 // Now handle the pre zygote table. 3459 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 3460 // called from the debugger. 3461 while (true) { 3462 auto it = pre_zygote_class_table_.Find(descriptor); 3463 if (it == pre_zygote_class_table_.end()) { 3464 break; 3465 } 3466 result.push_back(it->Read()); 3467 pre_zygote_class_table_.Erase(it); 3468 } 3469 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 3470 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 3471 } 3472} 3473 3474void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3475 // TODO: assert that the monitor on the Class is held 3476 ObjectLock<mirror::Class> lock(self, klass); 3477 3478 // Don't attempt to re-verify if already sufficiently verified. 3479 if (klass->IsVerified()) { 3480 EnsurePreverifiedMethods(klass); 3481 return; 3482 } 3483 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsAotCompiler()) { 3484 return; 3485 } 3486 3487 // The class might already be erroneous, for example at compile time if we attempted to verify 3488 // this class as a parent to another. 3489 if (klass->IsErroneous()) { 3490 ThrowEarlierClassFailure(klass.Get()); 3491 return; 3492 } 3493 3494 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3495 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3496 } else { 3497 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3498 << PrettyClass(klass.Get()); 3499 CHECK(!Runtime::Current()->IsAotCompiler()); 3500 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3501 } 3502 3503 // Skip verification if disabled. 3504 if (!Runtime::Current()->IsVerificationEnabled()) { 3505 klass->SetStatus(mirror::Class::kStatusVerified, self); 3506 EnsurePreverifiedMethods(klass); 3507 return; 3508 } 3509 3510 // Verify super class. 3511 StackHandleScope<2> hs(self); 3512 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3513 if (super.Get() != nullptr) { 3514 // Acquire lock to prevent races on verifying the super class. 3515 ObjectLock<mirror::Class> super_lock(self, super); 3516 3517 if (!super->IsVerified() && !super->IsErroneous()) { 3518 VerifyClass(self, super); 3519 } 3520 if (!super->IsCompileTimeVerified()) { 3521 std::string error_msg( 3522 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3523 PrettyDescriptor(klass.Get()).c_str(), 3524 PrettyDescriptor(super.Get()).c_str())); 3525 LOG(WARNING) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3526 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3527 if (cause.Get() != nullptr) { 3528 self->ClearException(); 3529 } 3530 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3531 if (cause.Get() != nullptr) { 3532 self->GetException(nullptr)->SetCause(cause.Get()); 3533 } 3534 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3535 if (Runtime::Current()->IsAotCompiler()) { 3536 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3537 } 3538 klass->SetStatus(mirror::Class::kStatusError, self); 3539 return; 3540 } 3541 } 3542 3543 // Try to use verification information from the oat file, otherwise do runtime verification. 3544 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3545 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3546 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3547 if (oat_file_class_status == mirror::Class::kStatusError) { 3548 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3549 << PrettyDescriptor(klass.Get()) << " in " 3550 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3551 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3552 PrettyDescriptor(klass.Get()).c_str()); 3553 klass->SetStatus(mirror::Class::kStatusError, self); 3554 return; 3555 } 3556 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3557 std::string error_msg; 3558 if (!preverified) { 3559 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3560 Runtime::Current()->IsAotCompiler(), 3561 &error_msg); 3562 } 3563 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3564 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3565 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3566 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3567 << " because: " << error_msg; 3568 } 3569 self->AssertNoPendingException(); 3570 // Make sure all classes referenced by catch blocks are resolved. 3571 ResolveClassExceptionHandlerTypes(dex_file, klass); 3572 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3573 // Even though there were no verifier failures we need to respect whether the super-class 3574 // was verified or requiring runtime reverification. 3575 if (super.Get() == nullptr || super->IsVerified()) { 3576 klass->SetStatus(mirror::Class::kStatusVerified, self); 3577 } else { 3578 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3579 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3580 // Pretend a soft failure occured so that we don't consider the class verified below. 3581 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3582 } 3583 } else { 3584 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3585 // Soft failures at compile time should be retried at runtime. Soft 3586 // failures at runtime will be handled by slow paths in the generated 3587 // code. Set status accordingly. 3588 if (Runtime::Current()->IsAotCompiler()) { 3589 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3590 } else { 3591 klass->SetStatus(mirror::Class::kStatusVerified, self); 3592 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3593 // later. 3594 klass->SetPreverified(); 3595 } 3596 } 3597 } else { 3598 LOG(WARNING) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3599 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3600 << " because: " << error_msg; 3601 self->AssertNoPendingException(); 3602 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3603 klass->SetStatus(mirror::Class::kStatusError, self); 3604 } 3605 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3606 // Class is verified so we don't need to do any access check on its methods. 3607 // Let the interpreter know it by setting the kAccPreverified flag onto each 3608 // method. 3609 // Note: we're going here during compilation and at runtime. When we set the 3610 // kAccPreverified flag when compiling image classes, the flag is recorded 3611 // in the image and is set when loading the image. 3612 EnsurePreverifiedMethods(klass); 3613 } 3614} 3615 3616void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3617 if (!klass->IsPreverified()) { 3618 klass->SetPreverifiedFlagOnAllMethods(); 3619 klass->SetPreverified(); 3620 } 3621} 3622 3623bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3624 mirror::Class::Status& oat_file_class_status) { 3625 // If we're compiling, we can only verify the class using the oat file if 3626 // we are not compiling the image or if the class we're verifying is not part of 3627 // the app. In other words, we will only check for preverification of bootclasspath 3628 // classes. 3629 if (Runtime::Current()->IsAotCompiler()) { 3630 // Are we compiling the bootclasspath? 3631 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3632 return false; 3633 } 3634 // We are compiling an app (not the image). 3635 3636 // Is this an app class? (I.e. not a bootclasspath class) 3637 if (klass->GetClassLoader() != nullptr) { 3638 return false; 3639 } 3640 } 3641 3642 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3643 // In case we run without an image there won't be a backing oat file. 3644 if (oat_dex_file == nullptr) { 3645 return false; 3646 } 3647 3648 // We may be running with a preopted oat file but without image. In this case, 3649 // we don't skip verification of preverified classes to ensure we initialize 3650 // dex caches with all types resolved during verification. 3651 // We need to trust image classes, as these might be coming out of a pre-opted, quickened boot 3652 // image (that we just failed loading), and the verifier can't be run on quickened opcodes when 3653 // the runtime isn't started. On the other hand, app classes can be re-verified even if they are 3654 // already pre-opted, as then the runtime is started. 3655 if (!Runtime::Current()->IsAotCompiler() && 3656 !Runtime::Current()->GetHeap()->HasImageSpace() && 3657 klass->GetClassLoader() != nullptr) { 3658 return false; 3659 } 3660 3661 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3662 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3663 if (oat_file_class_status == mirror::Class::kStatusVerified || 3664 oat_file_class_status == mirror::Class::kStatusInitialized) { 3665 return true; 3666 } 3667 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3668 // Compile time verification failed with a soft error. Compile time verification can fail 3669 // because we have incomplete type information. Consider the following: 3670 // class ... { 3671 // Foo x; 3672 // .... () { 3673 // if (...) { 3674 // v1 gets assigned a type of resolved class Foo 3675 // } else { 3676 // v1 gets assigned a type of unresolved class Bar 3677 // } 3678 // iput x = v1 3679 // } } 3680 // when we merge v1 following the if-the-else it results in Conflict 3681 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3682 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3683 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3684 // at compile time). 3685 return false; 3686 } 3687 if (oat_file_class_status == mirror::Class::kStatusError) { 3688 // Compile time verification failed with a hard error. This is caused by invalid instructions 3689 // in the class. These errors are unrecoverable. 3690 return false; 3691 } 3692 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3693 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3694 // not loading the class. 3695 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3696 // isn't a problem and this case shouldn't occur 3697 return false; 3698 } 3699 std::string temp; 3700 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3701 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3702 << klass->GetDescriptor(&temp); 3703 UNREACHABLE(); 3704} 3705 3706void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3707 Handle<mirror::Class> klass) { 3708 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3709 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3710 } 3711 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3712 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3713 } 3714} 3715 3716void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3717 mirror::ArtMethod* method) { 3718 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3719 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3720 if (code_item == nullptr) { 3721 return; // native or abstract method 3722 } 3723 if (code_item->tries_size_ == 0) { 3724 return; // nothing to process 3725 } 3726 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3727 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3728 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3729 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3730 CatchHandlerIterator iterator(handlers_ptr); 3731 for (; iterator.HasNext(); iterator.Next()) { 3732 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3733 // unresolved exception types will be ignored by exception delivery 3734 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3735 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3736 if (exception_type == nullptr) { 3737 DCHECK(Thread::Current()->IsExceptionPending()); 3738 Thread::Current()->ClearException(); 3739 } 3740 } 3741 } 3742 handlers_ptr = iterator.EndDataPointer(); 3743 } 3744} 3745 3746static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3747static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3748 Handle<mirror::ArtMethod> prototype); 3749 3750mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3751 jobjectArray interfaces, jobject loader, 3752 jobjectArray methods, jobjectArray throws) { 3753 Thread* self = soa.Self(); 3754 StackHandleScope<8> hs(self); 3755 MutableHandle<mirror::Class> klass(hs.NewHandle( 3756 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3757 if (klass.Get() == nullptr) { 3758 CHECK(self->IsExceptionPending()); // OOME. 3759 return nullptr; 3760 } 3761 DCHECK(klass->GetClass() != nullptr); 3762 klass->SetObjectSize(sizeof(mirror::Proxy)); 3763 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3764 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3765 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3766 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3767 klass->SetName(soa.Decode<mirror::String*>(name)); 3768 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3769 klass->SetDexCache(proxy_class->GetDexCache()); 3770 klass->SetStatus(mirror::Class::kStatusIdx, self); 3771 3772 // Instance fields are inherited, but we add a couple of static fields... 3773 { 3774 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3775 if (UNLIKELY(sfields == nullptr)) { 3776 CHECK(self->IsExceptionPending()); // OOME. 3777 return nullptr; 3778 } 3779 klass->SetSFields(sfields); 3780 } 3781 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3782 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3783 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3784 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3785 CHECK(self->IsExceptionPending()); // OOME. 3786 return nullptr; 3787 } 3788 klass->SetStaticField(0, interfaces_sfield.Get()); 3789 interfaces_sfield->SetDexFieldIndex(0); 3790 interfaces_sfield->SetDeclaringClass(klass.Get()); 3791 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3792 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3793 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3794 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3795 CHECK(self->IsExceptionPending()); // OOME. 3796 return nullptr; 3797 } 3798 klass->SetStaticField(1, throws_sfield.Get()); 3799 throws_sfield->SetDexFieldIndex(1); 3800 throws_sfield->SetDeclaringClass(klass.Get()); 3801 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3802 3803 // Proxies have 1 direct method, the constructor 3804 { 3805 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3806 if (UNLIKELY(directs == nullptr)) { 3807 CHECK(self->IsExceptionPending()); // OOME. 3808 return nullptr; 3809 } 3810 klass->SetDirectMethods(directs); 3811 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3812 if (UNLIKELY(constructor == nullptr)) { 3813 CHECK(self->IsExceptionPending()); // OOME. 3814 return nullptr; 3815 } 3816 klass->SetDirectMethod(0, constructor); 3817 } 3818 3819 // Create virtual method using specified prototypes. 3820 size_t num_virtual_methods = 3821 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3822 { 3823 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3824 num_virtual_methods); 3825 if (UNLIKELY(virtuals == nullptr)) { 3826 CHECK(self->IsExceptionPending()); // OOME. 3827 return nullptr; 3828 } 3829 klass->SetVirtualMethods(virtuals); 3830 } 3831 for (size_t i = 0; i < num_virtual_methods; ++i) { 3832 StackHandleScope<1> hs2(self); 3833 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3834 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3835 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3836 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3837 if (UNLIKELY(clone == nullptr)) { 3838 CHECK(self->IsExceptionPending()); // OOME. 3839 return nullptr; 3840 } 3841 klass->SetVirtualMethod(i, clone); 3842 } 3843 3844 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3845 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3846 self->AssertNoPendingException(); 3847 3848 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3849 mirror::Class* new_class = nullptr; 3850 { 3851 // Must hold lock on object when resolved. 3852 ObjectLock<mirror::Class> resolution_lock(self, klass); 3853 // Link the fields and virtual methods, creating vtable and iftables 3854 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3855 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3856 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3857 klass->SetStatus(mirror::Class::kStatusError, self); 3858 return nullptr; 3859 } 3860 } 3861 3862 CHECK(klass->IsRetired()); 3863 CHECK_NE(klass.Get(), new_class); 3864 klass.Assign(new_class); 3865 3866 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3867 interfaces_sfield->SetObject<false>(klass.Get(), 3868 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3869 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3870 throws_sfield->SetObject<false>(klass.Get(), 3871 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3872 3873 { 3874 // Lock on klass is released. Lock new class object. 3875 ObjectLock<mirror::Class> initialization_lock(self, klass); 3876 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3877 } 3878 3879 // sanity checks 3880 if (kIsDebugBuild) { 3881 CHECK(klass->GetIFields() == nullptr); 3882 CheckProxyConstructor(klass->GetDirectMethod(0)); 3883 for (size_t i = 0; i < num_virtual_methods; ++i) { 3884 StackHandleScope<2> hs2(self); 3885 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3886 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3887 Handle<mirror::ArtMethod> prototype(hs2.NewHandle(decoded_methods->Get(i))); 3888 Handle<mirror::ArtMethod> virtual_method(hs2.NewHandle(klass->GetVirtualMethod(i))); 3889 CheckProxyMethod(virtual_method, prototype); 3890 } 3891 3892 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3893 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3894 decoded_name->ToModifiedUtf8().c_str())); 3895 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3896 3897 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3898 decoded_name->ToModifiedUtf8().c_str())); 3899 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3900 3901 CHECK_EQ(klass.Get()->GetInterfaces(), 3902 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3903 CHECK_EQ(klass.Get()->GetThrows(), 3904 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3905 } 3906 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3907 ComputeModifiedUtf8Hash(descriptor.c_str())); 3908 CHECK(existing == nullptr); 3909 return klass.Get(); 3910} 3911 3912std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3913 DCHECK(proxy_class->IsProxyClass()); 3914 mirror::String* name = proxy_class->GetName(); 3915 DCHECK(name != nullptr); 3916 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3917} 3918 3919mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3920 mirror::ArtMethod* proxy_method) { 3921 DCHECK(proxy_class->IsProxyClass()); 3922 DCHECK(proxy_method->IsProxyMethod()); 3923 // Locate the dex cache of the original interface/Object 3924 mirror::DexCache* dex_cache = nullptr; 3925 { 3926 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3927 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3928 mirror::DexCache* a_dex_cache = GetDexCache(i); 3929 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3930 dex_cache = a_dex_cache; 3931 break; 3932 } 3933 } 3934 } 3935 CHECK(dex_cache != nullptr); 3936 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3937 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3938 CHECK(resolved_method != nullptr); 3939 return resolved_method; 3940} 3941 3942 3943mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3944 Handle<mirror::Class> klass, 3945 mirror::Class* proxy_class) { 3946 // Create constructor for Proxy that must initialize h 3947 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3948 proxy_class->GetDirectMethods(); 3949 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3950 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3951 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3952 // constructor method. 3953 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3954 proxy_constructor); 3955 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3956 // code_ too) 3957 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3958 if (constructor == nullptr) { 3959 CHECK(self->IsExceptionPending()); // OOME. 3960 return nullptr; 3961 } 3962 // Make this constructor public and fix the class to be our Proxy version 3963 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3964 constructor->SetDeclaringClass(klass.Get()); 3965 return constructor; 3966} 3967 3968static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3969 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3970 CHECK(constructor->IsConstructor()); 3971 CHECK_STREQ(constructor->GetName(), "<init>"); 3972 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3973 "(Ljava/lang/reflect/InvocationHandler;)V"); 3974 DCHECK(constructor->IsPublic()); 3975} 3976 3977mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3978 Handle<mirror::Class> klass, 3979 Handle<mirror::ArtMethod> prototype) { 3980 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3981 // prototype method 3982 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3983 prototype.Get()); 3984 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3985 // as necessary 3986 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3987 if (UNLIKELY(method == nullptr)) { 3988 CHECK(self->IsExceptionPending()); // OOME. 3989 return nullptr; 3990 } 3991 3992 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3993 // the intersection of throw exceptions as defined in Proxy 3994 method->SetDeclaringClass(klass.Get()); 3995 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3996 3997 // At runtime the method looks like a reference and argument saving method, clone the code 3998 // related parameters from this method. 3999 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4000 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4001 4002 return method; 4003} 4004 4005static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4006 Handle<mirror::ArtMethod> prototype) 4007 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4008 // Basic sanity 4009 CHECK(!prototype->IsFinal()); 4010 CHECK(method->IsFinal()); 4011 CHECK(!method->IsAbstract()); 4012 4013 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4014 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4015 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4016 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4017 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4018 4019 CHECK_STREQ(method->GetName(), prototype->GetName()); 4020 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4021 // More complex sanity - via dex cache 4022 CHECK_EQ(method->GetInterfaceMethodIfProxy()->GetReturnType(), prototype->GetReturnType()); 4023} 4024 4025static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4026 bool can_init_parents) 4027 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4028 if (can_init_statics && can_init_parents) { 4029 return true; 4030 } 4031 if (!can_init_statics) { 4032 // Check if there's a class initializer. 4033 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4034 if (clinit != nullptr) { 4035 return false; 4036 } 4037 // Check if there are encoded static values needing initialization. 4038 if (klass->NumStaticFields() != 0) { 4039 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4040 DCHECK(dex_class_def != nullptr); 4041 if (dex_class_def->static_values_off_ != 0) { 4042 return false; 4043 } 4044 } 4045 } 4046 if (!klass->IsInterface() && klass->HasSuperClass()) { 4047 mirror::Class* super_class = klass->GetSuperClass(); 4048 if (!can_init_parents && !super_class->IsInitialized()) { 4049 return false; 4050 } else { 4051 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4052 return false; 4053 } 4054 } 4055 } 4056 return true; 4057} 4058 4059bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4060 bool can_init_statics, bool can_init_parents) { 4061 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4062 4063 // Are we already initialized and therefore done? 4064 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4065 // an initialized class will never change its state. 4066 if (klass->IsInitialized()) { 4067 return true; 4068 } 4069 4070 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4071 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4072 return false; 4073 } 4074 4075 self->AllowThreadSuspension(); 4076 uint64_t t0; 4077 { 4078 ObjectLock<mirror::Class> lock(self, klass); 4079 4080 // Re-check under the lock in case another thread initialized ahead of us. 4081 if (klass->IsInitialized()) { 4082 return true; 4083 } 4084 4085 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4086 if (klass->IsErroneous()) { 4087 ThrowEarlierClassFailure(klass.Get()); 4088 VlogClassInitializationFailure(klass); 4089 return false; 4090 } 4091 4092 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4093 4094 if (!klass->IsVerified()) { 4095 VerifyClass(self, klass); 4096 if (!klass->IsVerified()) { 4097 // We failed to verify, expect either the klass to be erroneous or verification failed at 4098 // compile time. 4099 if (klass->IsErroneous()) { 4100 CHECK(self->IsExceptionPending()); 4101 VlogClassInitializationFailure(klass); 4102 } else { 4103 CHECK(Runtime::Current()->IsAotCompiler()); 4104 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4105 } 4106 return false; 4107 } else { 4108 self->AssertNoPendingException(); 4109 } 4110 } 4111 4112 // If the class is kStatusInitializing, either this thread is 4113 // initializing higher up the stack or another thread has beat us 4114 // to initializing and we need to wait. Either way, this 4115 // invocation of InitializeClass will not be responsible for 4116 // running <clinit> and will return. 4117 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4118 // Could have got an exception during verification. 4119 if (self->IsExceptionPending()) { 4120 VlogClassInitializationFailure(klass); 4121 return false; 4122 } 4123 // We caught somebody else in the act; was it us? 4124 if (klass->GetClinitThreadId() == self->GetTid()) { 4125 // Yes. That's fine. Return so we can continue initializing. 4126 return true; 4127 } 4128 // No. That's fine. Wait for another thread to finish initializing. 4129 return WaitForInitializeClass(klass, self, lock); 4130 } 4131 4132 if (!ValidateSuperClassDescriptors(klass)) { 4133 klass->SetStatus(mirror::Class::kStatusError, self); 4134 return false; 4135 } 4136 self->AllowThreadSuspension(); 4137 4138 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4139 4140 // From here out other threads may observe that we're initializing and so changes of state 4141 // require the a notification. 4142 klass->SetClinitThreadId(self->GetTid()); 4143 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4144 4145 t0 = NanoTime(); 4146 } 4147 4148 // Initialize super classes, must be done while initializing for the JLS. 4149 if (!klass->IsInterface() && klass->HasSuperClass()) { 4150 mirror::Class* super_class = klass->GetSuperClass(); 4151 if (!super_class->IsInitialized()) { 4152 CHECK(!super_class->IsInterface()); 4153 CHECK(can_init_parents); 4154 StackHandleScope<1> hs(self); 4155 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4156 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4157 if (!super_initialized) { 4158 // The super class was verified ahead of entering initializing, we should only be here if 4159 // the super class became erroneous due to initialization. 4160 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4161 << "Super class initialization failed for " 4162 << PrettyDescriptor(handle_scope_super.Get()) 4163 << " that has unexpected status " << handle_scope_super->GetStatus() 4164 << "\nPending exception:\n" 4165 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4166 ObjectLock<mirror::Class> lock(self, klass); 4167 // Initialization failed because the super-class is erroneous. 4168 klass->SetStatus(mirror::Class::kStatusError, self); 4169 return false; 4170 } 4171 } 4172 } 4173 4174 const size_t num_static_fields = klass->NumStaticFields(); 4175 if (num_static_fields > 0) { 4176 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4177 CHECK(dex_class_def != nullptr); 4178 const DexFile& dex_file = klass->GetDexFile(); 4179 StackHandleScope<3> hs(self); 4180 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4181 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4182 4183 // Eagerly fill in static fields so that the we don't have to do as many expensive 4184 // Class::FindStaticField in ResolveField. 4185 for (size_t i = 0; i < num_static_fields; ++i) { 4186 mirror::ArtField* field = klass->GetStaticField(i); 4187 const uint32_t field_idx = field->GetDexFieldIndex(); 4188 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 4189 if (resolved_field == nullptr) { 4190 dex_cache->SetResolvedField(field_idx, field); 4191 } else { 4192 DCHECK_EQ(field, resolved_field); 4193 } 4194 } 4195 4196 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4197 this, *dex_class_def); 4198 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4199 ClassDataItemIterator field_it(dex_file, class_data); 4200 if (value_it.HasNext()) { 4201 DCHECK(field_it.HasNextStaticField()); 4202 CHECK(can_init_statics); 4203 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4204 StackHandleScope<1> hs2(self); 4205 Handle<mirror::ArtField> field(hs2.NewHandle( 4206 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4207 if (Runtime::Current()->IsActiveTransaction()) { 4208 value_it.ReadValueToField<true>(field); 4209 } else { 4210 value_it.ReadValueToField<false>(field); 4211 } 4212 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4213 } 4214 } 4215 } 4216 4217 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4218 if (clinit != nullptr) { 4219 CHECK(can_init_statics); 4220 JValue result; 4221 clinit->Invoke(self, nullptr, 0, &result, "V"); 4222 } 4223 4224 self->AllowThreadSuspension(); 4225 uint64_t t1 = NanoTime(); 4226 4227 bool success = true; 4228 { 4229 ObjectLock<mirror::Class> lock(self, klass); 4230 4231 if (self->IsExceptionPending()) { 4232 WrapExceptionInInitializer(klass); 4233 klass->SetStatus(mirror::Class::kStatusError, self); 4234 success = false; 4235 } else if (Runtime::Current()->IsTransactionAborted()) { 4236 // The exception thrown when the transaction aborted has been caught and cleared 4237 // so we need to throw it again now. 4238 LOG(WARNING) << "Return from class initializer of " << PrettyDescriptor(klass.Get()) 4239 << " without exception while transaction was aborted: re-throw it now."; 4240 Runtime::Current()->ThrowInternalErrorForAbortedTransaction(self); 4241 klass->SetStatus(mirror::Class::kStatusError, self); 4242 success = false; 4243 } else { 4244 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4245 RuntimeStats* thread_stats = self->GetStats(); 4246 ++global_stats->class_init_count; 4247 ++thread_stats->class_init_count; 4248 global_stats->class_init_time_ns += (t1 - t0); 4249 thread_stats->class_init_time_ns += (t1 - t0); 4250 // Set the class as initialized except if failed to initialize static fields. 4251 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4252 if (VLOG_IS_ON(class_linker)) { 4253 std::string temp; 4254 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4255 klass->GetLocation(); 4256 } 4257 // Opportunistically set static method trampolines to their destination. 4258 FixupStaticTrampolines(klass.Get()); 4259 } 4260 } 4261 return success; 4262} 4263 4264bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4265 ObjectLock<mirror::Class>& lock) 4266 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4267 while (true) { 4268 self->AssertNoPendingException(); 4269 CHECK(!klass->IsInitialized()); 4270 lock.WaitIgnoringInterrupts(); 4271 4272 // When we wake up, repeat the test for init-in-progress. If 4273 // there's an exception pending (only possible if 4274 // we were not using WaitIgnoringInterrupts), bail out. 4275 if (self->IsExceptionPending()) { 4276 WrapExceptionInInitializer(klass); 4277 klass->SetStatus(mirror::Class::kStatusError, self); 4278 return false; 4279 } 4280 // Spurious wakeup? Go back to waiting. 4281 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4282 continue; 4283 } 4284 if (klass->GetStatus() == mirror::Class::kStatusVerified && 4285 Runtime::Current()->IsAotCompiler()) { 4286 // Compile time initialization failed. 4287 return false; 4288 } 4289 if (klass->IsErroneous()) { 4290 // The caller wants an exception, but it was thrown in a 4291 // different thread. Synthesize one here. 4292 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4293 PrettyDescriptor(klass.Get()).c_str()); 4294 VlogClassInitializationFailure(klass); 4295 return false; 4296 } 4297 if (klass->IsInitialized()) { 4298 return true; 4299 } 4300 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4301 << klass->GetStatus(); 4302 } 4303 UNREACHABLE(); 4304} 4305 4306static bool HasSameSignatureWithDifferentClassLoaders(Thread* self, 4307 Handle<mirror::ArtMethod> method1, 4308 Handle<mirror::ArtMethod> method2, 4309 std::string* error_msg) 4310 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4311 { 4312 StackHandleScope<1> hs(self); 4313 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType())); 4314 mirror::Class* other_return_type = method2->GetReturnType(); 4315 // NOTE: return_type.Get() must be sequenced after method2->GetReturnType(). 4316 if (UNLIKELY(other_return_type != return_type.Get())) { 4317 *error_msg = StringPrintf("Return types mismatch: %s(%p) vs %s(%p)", 4318 PrettyClassAndClassLoader(return_type.Get()).c_str(), 4319 return_type.Get(), 4320 PrettyClassAndClassLoader(other_return_type).c_str(), 4321 other_return_type); 4322 return false; 4323 } 4324 } 4325 const DexFile::TypeList* types1 = method1->GetParameterTypeList(); 4326 const DexFile::TypeList* types2 = method2->GetParameterTypeList(); 4327 if (types1 == nullptr) { 4328 if (types2 != nullptr && types2->Size() != 0) { 4329 *error_msg = StringPrintf("Type list mismatch with %s", 4330 PrettyMethod(method2.Get(), true).c_str()); 4331 return false; 4332 } 4333 return true; 4334 } else if (UNLIKELY(types2 == nullptr)) { 4335 if (types1->Size() != 0) { 4336 *error_msg = StringPrintf("Type list mismatch with %s", 4337 PrettyMethod(method2.Get(), true).c_str()); 4338 return false; 4339 } 4340 return true; 4341 } 4342 uint32_t num_types = types1->Size(); 4343 if (UNLIKELY(num_types != types2->Size())) { 4344 *error_msg = StringPrintf("Type list mismatch with %s", 4345 PrettyMethod(method2.Get(), true).c_str()); 4346 return false; 4347 } 4348 for (uint32_t i = 0; i < num_types; ++i) { 4349 StackHandleScope<1> hs(self); 4350 Handle<mirror::Class> param_type(hs.NewHandle( 4351 method1->GetClassFromTypeIndex(types1->GetTypeItem(i).type_idx_, true))); 4352 mirror::Class* other_param_type = 4353 method2->GetClassFromTypeIndex(types2->GetTypeItem(i).type_idx_, true); 4354 // NOTE: param_type.Get() must be sequenced after method2->GetClassFromTypeIndex(...). 4355 if (UNLIKELY(param_type.Get() != other_param_type)) { 4356 *error_msg = StringPrintf("Parameter %u type mismatch: %s(%p) vs %s(%p)", 4357 i, 4358 PrettyClassAndClassLoader(param_type.Get()).c_str(), 4359 param_type.Get(), 4360 PrettyClassAndClassLoader(other_param_type).c_str(), 4361 other_param_type); 4362 return false; 4363 } 4364 } 4365 return true; 4366} 4367 4368 4369bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4370 if (klass->IsInterface()) { 4371 return true; 4372 } 4373 // Begin with the methods local to the superclass. 4374 Thread* self = Thread::Current(); 4375 StackHandleScope<2> hs(self); 4376 MutableHandle<mirror::ArtMethod> h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4377 MutableHandle<mirror::ArtMethod> super_h_m(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4378 if (klass->HasSuperClass() && 4379 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4380 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4381 h_m.Assign(klass->GetVTableEntry(i)); 4382 super_h_m.Assign(klass->GetSuperClass()->GetVTableEntry(i)); 4383 if (h_m.Get() != super_h_m.Get()) { 4384 std::string error_msg; 4385 if (!HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m, &error_msg)) { 4386 ThrowLinkageError(klass.Get(), 4387 "Class %s method %s resolves differently in superclass %s: %s", 4388 PrettyDescriptor(klass.Get()).c_str(), 4389 PrettyMethod(h_m.Get()).c_str(), 4390 PrettyDescriptor(klass->GetSuperClass()).c_str(), 4391 error_msg.c_str()); 4392 return false; 4393 } 4394 } 4395 } 4396 } 4397 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4398 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4399 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4400 for (uint32_t j = 0; j < num_methods; ++j) { 4401 h_m.Assign(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4402 super_h_m.Assign(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4403 if (h_m.Get() != super_h_m.Get()) { 4404 std::string error_msg; 4405 if (!HasSameSignatureWithDifferentClassLoaders(self, h_m, super_h_m, &error_msg)) { 4406 ThrowLinkageError(klass.Get(), 4407 "Class %s method %s resolves differently in interface %s: %s", 4408 PrettyDescriptor(klass.Get()).c_str(), 4409 PrettyMethod(h_m.Get()).c_str(), 4410 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str(), 4411 error_msg.c_str()); 4412 return false; 4413 } 4414 } 4415 } 4416 } 4417 } 4418 return true; 4419} 4420 4421bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4422 bool can_init_parents) { 4423 DCHECK(c.Get() != nullptr); 4424 if (c->IsInitialized()) { 4425 EnsurePreverifiedMethods(c); 4426 return true; 4427 } 4428 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4429 if (!success) { 4430 if (can_init_fields && can_init_parents) { 4431 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4432 } 4433 } else { 4434 self->AssertNoPendingException(); 4435 } 4436 return success; 4437} 4438 4439void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4440 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4441 if (fields != nullptr) { 4442 for (int index = 0; index < fields->GetLength(); index ++) { 4443 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4444 fields->Get(index)->SetDeclaringClass(new_class); 4445 } 4446 } 4447 } 4448 4449 fields = new_class->GetSFields(); 4450 if (fields != nullptr) { 4451 for (int index = 0; index < fields->GetLength(); index ++) { 4452 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4453 fields->Get(index)->SetDeclaringClass(new_class); 4454 } 4455 } 4456 } 4457 4458 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4459 if (methods != nullptr) { 4460 for (int index = 0; index < methods->GetLength(); index ++) { 4461 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4462 methods->Get(index)->SetDeclaringClass(new_class); 4463 } 4464 } 4465 } 4466 4467 methods = new_class->GetVirtualMethods(); 4468 if (methods != nullptr) { 4469 for (int index = 0; index < methods->GetLength(); index ++) { 4470 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4471 methods->Get(index)->SetDeclaringClass(new_class); 4472 } 4473 } 4474 } 4475} 4476 4477bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4478 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4479 mirror::Class** new_class) { 4480 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4481 4482 if (!LinkSuperClass(klass)) { 4483 return false; 4484 } 4485 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4486 self, Runtime::Current()->GetImtUnimplementedMethod()); 4487 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4488 return false; 4489 } 4490 if (!LinkInstanceFields(self, klass)) { 4491 return false; 4492 } 4493 size_t class_size; 4494 if (!LinkStaticFields(self, klass, &class_size)) { 4495 return false; 4496 } 4497 CreateReferenceInstanceOffsets(klass); 4498 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4499 4500 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4501 // We don't need to retire this class as it has no embedded tables or it was created the 4502 // correct size during class linker initialization. 4503 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4504 4505 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4506 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4507 } 4508 4509 // This will notify waiters on klass that saw the not yet resolved 4510 // class in the class_table_ during EnsureResolved. 4511 klass->SetStatus(mirror::Class::kStatusResolved, self); 4512 *new_class = klass.Get(); 4513 } else { 4514 CHECK(!klass->IsResolved()); 4515 // Retire the temporary class and create the correctly sized resolved class. 4516 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4517 if (UNLIKELY(*new_class == nullptr)) { 4518 CHECK(self->IsExceptionPending()); // Expect an OOME. 4519 klass->SetStatus(mirror::Class::kStatusError, self); 4520 return false; 4521 } 4522 4523 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4524 StackHandleScope<1> hs(self); 4525 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4526 ObjectLock<mirror::Class> lock(self, new_class_h); 4527 4528 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4529 4530 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 4531 ComputeModifiedUtf8Hash(descriptor)); 4532 CHECK(existing == nullptr || existing == klass.Get()); 4533 4534 // This will notify waiters on temp class that saw the not yet resolved class in the 4535 // class_table_ during EnsureResolved. 4536 klass->SetStatus(mirror::Class::kStatusRetired, self); 4537 4538 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4539 // This will notify waiters on new_class that saw the not yet resolved 4540 // class in the class_table_ during EnsureResolved. 4541 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4542 } 4543 return true; 4544} 4545 4546static void CountMethodsAndFields(ClassDataItemIterator& dex_data, 4547 size_t* virtual_methods, 4548 size_t* direct_methods, 4549 size_t* static_fields, 4550 size_t* instance_fields) { 4551 *virtual_methods = *direct_methods = *static_fields = *instance_fields = 0; 4552 4553 while (dex_data.HasNextStaticField()) { 4554 dex_data.Next(); 4555 (*static_fields)++; 4556 } 4557 while (dex_data.HasNextInstanceField()) { 4558 dex_data.Next(); 4559 (*instance_fields)++; 4560 } 4561 while (dex_data.HasNextDirectMethod()) { 4562 (*direct_methods)++; 4563 dex_data.Next(); 4564 } 4565 while (dex_data.HasNextVirtualMethod()) { 4566 (*virtual_methods)++; 4567 dex_data.Next(); 4568 } 4569 DCHECK(!dex_data.HasNext()); 4570} 4571 4572static void DumpClass(std::ostream& os, 4573 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4574 const char* suffix) { 4575 ClassDataItemIterator dex_data(dex_file, dex_file.GetClassData(dex_class_def)); 4576 os << dex_file.GetClassDescriptor(dex_class_def) << suffix << ":\n"; 4577 os << " Static fields:\n"; 4578 while (dex_data.HasNextStaticField()) { 4579 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4580 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4581 dex_data.Next(); 4582 } 4583 os << " Instance fields:\n"; 4584 while (dex_data.HasNextInstanceField()) { 4585 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4586 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4587 dex_data.Next(); 4588 } 4589 os << " Direct methods:\n"; 4590 while (dex_data.HasNextDirectMethod()) { 4591 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4592 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4593 dex_data.Next(); 4594 } 4595 os << " Virtual methods:\n"; 4596 while (dex_data.HasNextVirtualMethod()) { 4597 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4598 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4599 dex_data.Next(); 4600 } 4601} 4602 4603static std::string DumpClasses(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4604 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2) { 4605 std::ostringstream os; 4606 DumpClass(os, dex_file1, dex_class_def1, " (Compile time)"); 4607 DumpClass(os, dex_file2, dex_class_def2, " (Runtime)"); 4608 return os.str(); 4609} 4610 4611 4612// Very simple structural check on whether the classes match. Only compares the number of 4613// methods and fields. 4614static bool SimpleStructuralCheck(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4615 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2, 4616 std::string* error_msg) { 4617 ClassDataItemIterator dex_data1(dex_file1, dex_file1.GetClassData(dex_class_def1)); 4618 ClassDataItemIterator dex_data2(dex_file2, dex_file2.GetClassData(dex_class_def2)); 4619 4620 // Counters for current dex file. 4621 size_t dex_virtual_methods1, dex_direct_methods1, dex_static_fields1, dex_instance_fields1; 4622 CountMethodsAndFields(dex_data1, &dex_virtual_methods1, &dex_direct_methods1, &dex_static_fields1, 4623 &dex_instance_fields1); 4624 // Counters for compile-time dex file. 4625 size_t dex_virtual_methods2, dex_direct_methods2, dex_static_fields2, dex_instance_fields2; 4626 CountMethodsAndFields(dex_data2, &dex_virtual_methods2, &dex_direct_methods2, &dex_static_fields2, 4627 &dex_instance_fields2); 4628 4629 if (dex_virtual_methods1 != dex_virtual_methods2) { 4630 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4631 *error_msg = StringPrintf("Virtual method count off: %zu vs %zu\n%s", dex_virtual_methods1, 4632 dex_virtual_methods2, class_dump.c_str()); 4633 return false; 4634 } 4635 if (dex_direct_methods1 != dex_direct_methods2) { 4636 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4637 *error_msg = StringPrintf("Direct method count off: %zu vs %zu\n%s", dex_direct_methods1, 4638 dex_direct_methods2, class_dump.c_str()); 4639 return false; 4640 } 4641 if (dex_static_fields1 != dex_static_fields2) { 4642 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4643 *error_msg = StringPrintf("Static field count off: %zu vs %zu\n%s", dex_static_fields1, 4644 dex_static_fields2, class_dump.c_str()); 4645 return false; 4646 } 4647 if (dex_instance_fields1 != dex_instance_fields2) { 4648 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4649 *error_msg = StringPrintf("Instance field count off: %zu vs %zu\n%s", dex_instance_fields1, 4650 dex_instance_fields2, class_dump.c_str()); 4651 return false; 4652 } 4653 4654 return true; 4655} 4656 4657// Checks whether a the super-class changed from what we had at compile-time. This would 4658// invalidate quickening. 4659static bool CheckSuperClassChange(Handle<mirror::Class> klass, 4660 const DexFile& dex_file, 4661 const DexFile::ClassDef& class_def, 4662 mirror::Class* super_class) 4663 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4664 // Check for unexpected changes in the superclass. 4665 // Quick check 1) is the super_class class-loader the boot class loader? This always has 4666 // precedence. 4667 if (super_class->GetClassLoader() != nullptr && 4668 // Quick check 2) different dex cache? Breaks can only occur for different dex files, 4669 // which is implied by different dex cache. 4670 klass->GetDexCache() != super_class->GetDexCache()) { 4671 // Now comes the expensive part: things can be broken if (a) the klass' dex file has a 4672 // definition for the super-class, and (b) the files are in separate oat files. The oat files 4673 // are referenced from the dex file, so do (b) first. Only relevant if we have oat files. 4674 const OatFile* class_oat_file = dex_file.GetOatFile(); 4675 if (class_oat_file != nullptr) { 4676 const OatFile* loaded_super_oat_file = super_class->GetDexFile().GetOatFile(); 4677 if (loaded_super_oat_file != nullptr && class_oat_file != loaded_super_oat_file) { 4678 // Now check (a). 4679 const DexFile::ClassDef* super_class_def = dex_file.FindClassDef(class_def.superclass_idx_); 4680 if (super_class_def != nullptr) { 4681 // Uh-oh, we found something. Do our check. 4682 std::string error_msg; 4683 if (!SimpleStructuralCheck(dex_file, *super_class_def, 4684 super_class->GetDexFile(), *super_class->GetClassDef(), 4685 &error_msg)) { 4686 // Print a warning to the log. This exception might be caught, e.g., as common in test 4687 // drivers. When the class is later tried to be used, we re-throw a new instance, as we 4688 // only save the type of the exception. 4689 LOG(WARNING) << "Incompatible structural change detected: " << 4690 StringPrintf( 4691 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4692 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4693 class_oat_file->GetLocation().c_str(), 4694 loaded_super_oat_file->GetLocation().c_str(), 4695 error_msg.c_str()); 4696 ThrowIncompatibleClassChangeError(klass.Get(), 4697 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4698 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4699 class_oat_file->GetLocation().c_str(), 4700 loaded_super_oat_file->GetLocation().c_str(), 4701 error_msg.c_str()); 4702 return false; 4703 } 4704 } 4705 } 4706 } 4707 } 4708 return true; 4709} 4710 4711bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4712 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4713 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4714 uint16_t super_class_idx = class_def.superclass_idx_; 4715 if (super_class_idx != DexFile::kDexNoIndex16) { 4716 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4717 if (super_class == nullptr) { 4718 DCHECK(Thread::Current()->IsExceptionPending()); 4719 return false; 4720 } 4721 // Verify 4722 if (!klass->CanAccess(super_class)) { 4723 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4724 PrettyDescriptor(super_class).c_str(), 4725 PrettyDescriptor(klass.Get()).c_str()); 4726 return false; 4727 } 4728 CHECK(super_class->IsResolved()); 4729 klass->SetSuperClass(super_class); 4730 4731 if (!CheckSuperClassChange(klass, dex_file, class_def, super_class)) { 4732 DCHECK(Thread::Current()->IsExceptionPending()); 4733 return false; 4734 } 4735 } 4736 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4737 if (interfaces != nullptr) { 4738 for (size_t i = 0; i < interfaces->Size(); i++) { 4739 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4740 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4741 if (interface == nullptr) { 4742 DCHECK(Thread::Current()->IsExceptionPending()); 4743 return false; 4744 } 4745 // Verify 4746 if (!klass->CanAccess(interface)) { 4747 // TODO: the RI seemed to ignore this in my testing. 4748 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4749 PrettyDescriptor(interface).c_str(), 4750 PrettyDescriptor(klass.Get()).c_str()); 4751 return false; 4752 } 4753 } 4754 } 4755 // Mark the class as loaded. 4756 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4757 return true; 4758} 4759 4760bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4761 CHECK(!klass->IsPrimitive()); 4762 mirror::Class* super = klass->GetSuperClass(); 4763 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4764 if (super != nullptr) { 4765 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4766 return false; 4767 } 4768 return true; 4769 } 4770 if (super == nullptr) { 4771 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4772 PrettyDescriptor(klass.Get()).c_str()); 4773 return false; 4774 } 4775 // Verify 4776 if (super->IsFinal() || super->IsInterface()) { 4777 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4778 PrettyDescriptor(super).c_str(), 4779 PrettyDescriptor(klass.Get()).c_str(), 4780 super->IsFinal() ? "declared final" : "an interface"); 4781 return false; 4782 } 4783 if (!klass->CanAccess(super)) { 4784 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4785 PrettyDescriptor(super).c_str(), 4786 PrettyDescriptor(klass.Get()).c_str()); 4787 return false; 4788 } 4789 4790 // Inherit kAccClassIsFinalizable from the superclass in case this 4791 // class doesn't override finalize. 4792 if (super->IsFinalizable()) { 4793 klass->SetFinalizable(); 4794 } 4795 4796 // Inherit reference flags (if any) from the superclass. 4797 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4798 if (reference_flags != 0) { 4799 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4800 } 4801 // Disallow custom direct subclasses of java.lang.ref.Reference. 4802 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4803 ThrowLinkageError(klass.Get(), 4804 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4805 PrettyDescriptor(klass.Get()).c_str()); 4806 return false; 4807 } 4808 4809 if (kIsDebugBuild) { 4810 // Ensure super classes are fully resolved prior to resolving fields.. 4811 while (super != nullptr) { 4812 CHECK(super->IsResolved()); 4813 super = super->GetSuperClass(); 4814 } 4815 } 4816 return true; 4817} 4818 4819// Populate the class vtable and itable. Compute return type indices. 4820bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4821 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4822 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4823 self->AllowThreadSuspension(); 4824 if (klass->IsInterface()) { 4825 // No vtable. 4826 size_t count = klass->NumVirtualMethods(); 4827 if (!IsUint<16>(count)) { 4828 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4829 return false; 4830 } 4831 for (size_t i = 0; i < count; ++i) { 4832 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4833 } 4834 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4835 return false; 4836 } 4837 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4838} 4839 4840// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4841// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4842// caches in the implementation below. 4843class MethodNameAndSignatureComparator FINAL : public ValueObject { 4844 public: 4845 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4846 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4847 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4848 name_(nullptr), name_len_(0) { 4849 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4850 } 4851 4852 const char* GetName() { 4853 if (name_ == nullptr) { 4854 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4855 } 4856 return name_; 4857 } 4858 4859 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4860 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4861 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4862 const DexFile* other_dex_file = other->GetDexFile(); 4863 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4864 if (dex_file_ == other_dex_file) { 4865 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4866 } 4867 GetName(); // Only used to make sure its calculated. 4868 uint32_t other_name_len; 4869 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4870 &other_name_len); 4871 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4872 return false; 4873 } 4874 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4875 } 4876 4877 private: 4878 // Dex file for the method to compare against. 4879 const DexFile* const dex_file_; 4880 // MethodId for the method to compare against. 4881 const DexFile::MethodId* const mid_; 4882 // Lazily computed name from the dex file's strings. 4883 const char* name_; 4884 // Lazily computed name length. 4885 uint32_t name_len_; 4886}; 4887 4888class LinkVirtualHashTable { 4889 public: 4890 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4891 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4892 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4893 } 4894 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4895 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4896 const char* name = local_method->GetName(); 4897 uint32_t hash = ComputeModifiedUtf8Hash(name); 4898 uint32_t index = hash % hash_size_; 4899 // Linear probe until we have an empty slot. 4900 while (hash_table_[index] != invalid_index_) { 4901 if (++index == hash_size_) { 4902 index = 0; 4903 } 4904 } 4905 hash_table_[index] = virtual_method_index; 4906 } 4907 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4908 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4909 const char* name = comparator->GetName(); 4910 uint32_t hash = ComputeModifiedUtf8Hash(name); 4911 size_t index = hash % hash_size_; 4912 while (true) { 4913 const uint32_t value = hash_table_[index]; 4914 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4915 // the block and can safely assume not found. 4916 if (value == invalid_index_) { 4917 break; 4918 } 4919 if (value != removed_index_) { // This signifies not already overriden. 4920 mirror::ArtMethod* virtual_method = 4921 klass_->GetVirtualMethodDuringLinking(value); 4922 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4923 hash_table_[index] = removed_index_; 4924 return value; 4925 } 4926 } 4927 if (++index == hash_size_) { 4928 index = 0; 4929 } 4930 } 4931 return GetNotFoundIndex(); 4932 } 4933 static uint32_t GetNotFoundIndex() { 4934 return invalid_index_; 4935 } 4936 4937 private: 4938 static const uint32_t invalid_index_; 4939 static const uint32_t removed_index_; 4940 4941 Handle<mirror::Class> klass_; 4942 const size_t hash_size_; 4943 uint32_t* const hash_table_; 4944}; 4945 4946const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4947const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4948 4949bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4950 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4951 if (klass->HasSuperClass()) { 4952 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4953 const size_t max_count = num_virtual_methods + super_vtable_length; 4954 StackHandleScope<2> hs(self); 4955 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4956 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4957 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4958 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4959 if (UNLIKELY(vtable.Get() == nullptr)) { 4960 CHECK(self->IsExceptionPending()); // OOME. 4961 return false; 4962 } 4963 for (size_t i = 0; i < super_vtable_length; i++) { 4964 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4965 } 4966 if (num_virtual_methods == 0) { 4967 klass->SetVTable(vtable.Get()); 4968 return true; 4969 } 4970 } else { 4971 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4972 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4973 if (num_virtual_methods == 0) { 4974 klass->SetVTable(super_vtable); 4975 return true; 4976 } 4977 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4978 if (UNLIKELY(vtable.Get() == nullptr)) { 4979 CHECK(self->IsExceptionPending()); // OOME. 4980 return false; 4981 } 4982 } 4983 // How the algorithm works: 4984 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4985 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4986 // method which has not been matched to a vtable method, and j if the virtual method at the 4987 // index overrode the super virtual method at index j. 4988 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4989 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4990 // the need for the initial vtable which we later shrink back down). 4991 // 3. Add non overridden methods to the end of the vtable. 4992 static constexpr size_t kMaxStackHash = 250; 4993 const size_t hash_table_size = num_virtual_methods * 3; 4994 uint32_t* hash_table_ptr; 4995 std::unique_ptr<uint32_t[]> hash_heap_storage; 4996 if (hash_table_size <= kMaxStackHash) { 4997 hash_table_ptr = reinterpret_cast<uint32_t*>( 4998 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4999 } else { 5000 hash_heap_storage.reset(new uint32_t[hash_table_size]); 5001 hash_table_ptr = hash_heap_storage.get(); 5002 } 5003 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 5004 // Add virtual methods to the hash table. 5005 for (size_t i = 0; i < num_virtual_methods; ++i) { 5006 hash_table.Add(i); 5007 } 5008 // Loop through each super vtable method and see if they are overriden by a method we added to 5009 // the hash table. 5010 for (size_t j = 0; j < super_vtable_length; ++j) { 5011 // Search the hash table to see if we are overidden by any method. 5012 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 5013 MethodNameAndSignatureComparator super_method_name_comparator( 5014 super_method->GetInterfaceMethodIfProxy()); 5015 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 5016 if (hash_index != hash_table.GetNotFoundIndex()) { 5017 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 5018 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 5019 super_method->GetAccessFlags())) { 5020 if (super_method->IsFinal()) { 5021 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 5022 PrettyMethod(virtual_method).c_str(), 5023 super_method->GetDeclaringClassDescriptor()); 5024 return false; 5025 } 5026 vtable->SetWithoutChecks<false>(j, virtual_method); 5027 virtual_method->SetMethodIndex(j); 5028 } else { 5029 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 5030 << " would have incorrectly overridden the package-private method in " 5031 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 5032 } 5033 } 5034 } 5035 // Add the non overridden methods at the end. 5036 size_t actual_count = super_vtable_length; 5037 for (size_t i = 0; i < num_virtual_methods; ++i) { 5038 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 5039 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 5040 if (method_idx < super_vtable_length && 5041 local_method == vtable->GetWithoutChecks(method_idx)) { 5042 continue; 5043 } 5044 vtable->SetWithoutChecks<false>(actual_count, local_method); 5045 local_method->SetMethodIndex(actual_count); 5046 ++actual_count; 5047 } 5048 if (!IsUint<16>(actual_count)) { 5049 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 5050 return false; 5051 } 5052 // Shrink vtable if possible 5053 CHECK_LE(actual_count, max_count); 5054 if (actual_count < max_count) { 5055 vtable.Assign(vtable->CopyOf(self, actual_count)); 5056 if (UNLIKELY(vtable.Get() == nullptr)) { 5057 CHECK(self->IsExceptionPending()); // OOME. 5058 return false; 5059 } 5060 } 5061 klass->SetVTable(vtable.Get()); 5062 } else { 5063 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 5064 if (!IsUint<16>(num_virtual_methods)) { 5065 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 5066 static_cast<int>(num_virtual_methods)); 5067 return false; 5068 } 5069 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 5070 if (UNLIKELY(vtable == nullptr)) { 5071 CHECK(self->IsExceptionPending()); // OOME. 5072 return false; 5073 } 5074 for (size_t i = 0; i < num_virtual_methods; ++i) { 5075 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 5076 vtable->SetWithoutChecks<false>(i, virtual_method); 5077 virtual_method->SetMethodIndex(i & 0xFFFF); 5078 } 5079 klass->SetVTable(vtable); 5080 } 5081 return true; 5082} 5083 5084bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 5085 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 5086 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 5087 StackHandleScope<3> hs(self); 5088 Runtime* const runtime = Runtime::Current(); 5089 const bool has_superclass = klass->HasSuperClass(); 5090 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 5091 const bool have_interfaces = interfaces.Get() != nullptr; 5092 const size_t num_interfaces = 5093 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 5094 if (num_interfaces == 0) { 5095 if (super_ifcount == 0) { 5096 // Class implements no interfaces. 5097 DCHECK_EQ(klass->GetIfTableCount(), 0); 5098 DCHECK(klass->GetIfTable() == nullptr); 5099 return true; 5100 } 5101 // Class implements same interfaces as parent, are any of these not marker interfaces? 5102 bool has_non_marker_interface = false; 5103 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5104 for (size_t i = 0; i < super_ifcount; ++i) { 5105 if (super_iftable->GetMethodArrayCount(i) > 0) { 5106 has_non_marker_interface = true; 5107 break; 5108 } 5109 } 5110 // Class just inherits marker interfaces from parent so recycle parent's iftable. 5111 if (!has_non_marker_interface) { 5112 klass->SetIfTable(super_iftable); 5113 return true; 5114 } 5115 } 5116 size_t ifcount = super_ifcount + num_interfaces; 5117 for (size_t i = 0; i < num_interfaces; i++) { 5118 mirror::Class* interface = have_interfaces ? 5119 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 5120 DCHECK(interface != nullptr); 5121 if (UNLIKELY(!interface->IsInterface())) { 5122 std::string temp; 5123 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 5124 PrettyDescriptor(klass.Get()).c_str(), 5125 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 5126 return false; 5127 } 5128 ifcount += interface->GetIfTableCount(); 5129 } 5130 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 5131 if (UNLIKELY(iftable.Get() == nullptr)) { 5132 CHECK(self->IsExceptionPending()); // OOME. 5133 return false; 5134 } 5135 if (super_ifcount != 0) { 5136 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5137 for (size_t i = 0; i < super_ifcount; i++) { 5138 mirror::Class* super_interface = super_iftable->GetInterface(i); 5139 iftable->SetInterface(i, super_interface); 5140 } 5141 } 5142 self->AllowThreadSuspension(); 5143 // Flatten the interface inheritance hierarchy. 5144 size_t idx = super_ifcount; 5145 for (size_t i = 0; i < num_interfaces; i++) { 5146 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 5147 mirror::Class::GetDirectInterface(self, klass, i); 5148 // Check if interface is already in iftable 5149 bool duplicate = false; 5150 for (size_t j = 0; j < idx; j++) { 5151 mirror::Class* existing_interface = iftable->GetInterface(j); 5152 if (existing_interface == interface) { 5153 duplicate = true; 5154 break; 5155 } 5156 } 5157 if (!duplicate) { 5158 // Add this non-duplicate interface. 5159 iftable->SetInterface(idx++, interface); 5160 // Add this interface's non-duplicate super-interfaces. 5161 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 5162 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 5163 bool super_duplicate = false; 5164 for (size_t k = 0; k < idx; k++) { 5165 mirror::Class* existing_interface = iftable->GetInterface(k); 5166 if (existing_interface == super_interface) { 5167 super_duplicate = true; 5168 break; 5169 } 5170 } 5171 if (!super_duplicate) { 5172 iftable->SetInterface(idx++, super_interface); 5173 } 5174 } 5175 } 5176 } 5177 self->AllowThreadSuspension(); 5178 // Shrink iftable in case duplicates were found 5179 if (idx < ifcount) { 5180 DCHECK_NE(num_interfaces, 0U); 5181 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 5182 if (UNLIKELY(iftable.Get() == nullptr)) { 5183 CHECK(self->IsExceptionPending()); // OOME. 5184 return false; 5185 } 5186 ifcount = idx; 5187 } else { 5188 DCHECK_EQ(idx, ifcount); 5189 } 5190 klass->SetIfTable(iftable.Get()); 5191 // If we're an interface, we don't need the vtable pointers, so we're done. 5192 if (klass->IsInterface()) { 5193 return true; 5194 } 5195 size_t miranda_list_size = 0; 5196 size_t max_miranda_methods = 0; // The max size of miranda_list. 5197 for (size_t i = 0; i < ifcount; ++i) { 5198 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 5199 } 5200 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 5201 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 5202 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 5203 hs.NewHandle(klass->GetVTableDuringLinking())); 5204 // Copy the IMT from the super class if possible. 5205 bool extend_super_iftable = false; 5206 if (has_superclass) { 5207 mirror::Class* super_class = klass->GetSuperClass(); 5208 extend_super_iftable = true; 5209 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 5210 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 5211 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 5212 } 5213 } else { 5214 // No imt in the super class, need to reconstruct from the iftable. 5215 mirror::IfTable* if_table = super_class->GetIfTable(); 5216 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5217 const size_t length = super_class->GetIfTableCount(); 5218 for (size_t i = 0; i < length; ++i) { 5219 mirror::Class* interface = iftable->GetInterface(i); 5220 const size_t num_virtuals = interface->NumVirtualMethods(); 5221 const size_t method_array_count = if_table->GetMethodArrayCount(i); 5222 DCHECK_EQ(num_virtuals, method_array_count); 5223 if (method_array_count == 0) { 5224 continue; 5225 } 5226 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 5227 for (size_t j = 0; j < num_virtuals; ++j) { 5228 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 5229 if (method->IsMiranda()) { 5230 continue; 5231 } 5232 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 5233 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5234 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5235 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5236 out_imt->SetReference(imt_index, method); 5237 } else if (imt_ref != conflict_method) { 5238 out_imt->SetReference(imt_index, conflict_method); 5239 } 5240 } 5241 } 5242 } 5243 } 5244 for (size_t i = 0; i < ifcount; ++i) { 5245 self->AllowThreadSuspension(); 5246 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 5247 if (num_methods > 0) { 5248 StackHandleScope<2> hs2(self); 5249 const bool is_super = i < super_ifcount; 5250 const bool super_interface = is_super && extend_super_iftable; 5251 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 5252 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 5253 if (super_interface) { 5254 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 5255 DCHECK(if_table != nullptr); 5256 DCHECK(if_table->GetMethodArray(i) != nullptr); 5257 // If we are working on a super interface, try extending the existing method array. 5258 method_array = hs2.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 5259 AsObjectArray<mirror::ArtMethod>()); 5260 // We are overwriting a super class interface, try to only virtual methods instead of the 5261 // whole vtable. 5262 input_array = hs2.NewHandle(klass->GetVirtualMethods()); 5263 } else { 5264 method_array = hs2.NewHandle(AllocArtMethodArray(self, num_methods)); 5265 // A new interface, we need the whole vtable incase a new interface method is implemented 5266 // in the whole superclass. 5267 input_array = vtable; 5268 } 5269 if (UNLIKELY(method_array.Get() == nullptr)) { 5270 CHECK(self->IsExceptionPending()); // OOME. 5271 return false; 5272 } 5273 iftable->SetMethodArray(i, method_array.Get()); 5274 if (input_array.Get() == nullptr) { 5275 // If the added virtual methods is empty, do nothing. 5276 DCHECK(super_interface); 5277 continue; 5278 } 5279 for (size_t j = 0; j < num_methods; ++j) { 5280 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 5281 MethodNameAndSignatureComparator interface_name_comparator( 5282 interface_method->GetInterfaceMethodIfProxy()); 5283 int32_t k; 5284 // For each method listed in the interface's method list, find the 5285 // matching method in our class's method list. We want to favor the 5286 // subclass over the superclass, which just requires walking 5287 // back from the end of the vtable. (This only matters if the 5288 // superclass defines a private method and this class redefines 5289 // it -- otherwise it would use the same vtable slot. In .dex files 5290 // those don't end up in the virtual method table, so it shouldn't 5291 // matter which direction we go. We walk it backward anyway.) 5292 for (k = input_array->GetLength() - 1; k >= 0; --k) { 5293 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 5294 mirror::ArtMethod* vtable_method_for_name_comparison = 5295 vtable_method->GetInterfaceMethodIfProxy(); 5296 if (interface_name_comparator.HasSameNameAndSignature( 5297 vtable_method_for_name_comparison)) { 5298 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 5299 ThrowIllegalAccessError( 5300 klass.Get(), 5301 "Method '%s' implementing interface method '%s' is not public", 5302 PrettyMethod(vtable_method).c_str(), 5303 PrettyMethod(interface_method).c_str()); 5304 return false; 5305 } 5306 method_array->SetWithoutChecks<false>(j, vtable_method); 5307 // Place method in imt if entry is empty, place conflict otherwise. 5308 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5309 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5310 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5311 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5312 out_imt->SetReference(imt_index, vtable_method); 5313 } else if (imt_ref != conflict_method) { 5314 // If we are not a conflict and we have the same signature and name as the imt entry, 5315 // it must be that we overwrote a superclass vtable entry. 5316 MethodNameAndSignatureComparator imt_ref_name_comparator( 5317 imt_ref->GetInterfaceMethodIfProxy()); 5318 if (imt_ref_name_comparator.HasSameNameAndSignature( 5319 vtable_method_for_name_comparison)) { 5320 out_imt->SetReference(imt_index, vtable_method); 5321 } else { 5322 out_imt->SetReference(imt_index, conflict_method); 5323 } 5324 } 5325 break; 5326 } 5327 } 5328 if (k < 0 && !super_interface) { 5329 mirror::ArtMethod* miranda_method = nullptr; 5330 for (size_t l = 0; l < miranda_list_size; ++l) { 5331 mirror::ArtMethod* mir_method = miranda_list->Get(l); 5332 if (interface_name_comparator.HasSameNameAndSignature(mir_method)) { 5333 miranda_method = mir_method; 5334 break; 5335 } 5336 } 5337 if (miranda_method == nullptr) { 5338 // Point the interface table at a phantom slot. 5339 miranda_method = interface_method->Clone(self)->AsArtMethod(); 5340 if (UNLIKELY(miranda_method == nullptr)) { 5341 CHECK(self->IsExceptionPending()); // OOME. 5342 return false; 5343 } 5344 DCHECK_LT(miranda_list_size, max_miranda_methods); 5345 miranda_list->Set<false>(miranda_list_size++, miranda_method); 5346 } 5347 method_array->SetWithoutChecks<false>(j, miranda_method); 5348 } 5349 } 5350 } 5351 } 5352 if (miranda_list_size > 0) { 5353 int old_method_count = klass->NumVirtualMethods(); 5354 int new_method_count = old_method_count + miranda_list_size; 5355 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 5356 if (old_method_count == 0) { 5357 virtuals = AllocArtMethodArray(self, new_method_count); 5358 } else { 5359 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 5360 } 5361 if (UNLIKELY(virtuals == nullptr)) { 5362 CHECK(self->IsExceptionPending()); // OOME. 5363 return false; 5364 } 5365 klass->SetVirtualMethods(virtuals); 5366 5367 int old_vtable_count = vtable->GetLength(); 5368 int new_vtable_count = old_vtable_count + miranda_list_size; 5369 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 5370 if (UNLIKELY(vtable.Get() == nullptr)) { 5371 CHECK(self->IsExceptionPending()); // OOME. 5372 return false; 5373 } 5374 for (size_t i = 0; i < miranda_list_size; ++i) { 5375 mirror::ArtMethod* method = miranda_list->Get(i); 5376 // Leave the declaring class alone as type indices are relative to it 5377 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5378 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5379 klass->SetVirtualMethod(old_method_count + i, method); 5380 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5381 } 5382 // TODO: do not assign to the vtable field until it is fully constructed. 5383 klass->SetVTable(vtable.Get()); 5384 } 5385 5386 if (kIsDebugBuild) { 5387 mirror::ObjectArray<mirror::ArtMethod>* check_vtable = klass->GetVTableDuringLinking(); 5388 for (int i = 0; i < check_vtable->GetLength(); ++i) { 5389 CHECK(check_vtable->GetWithoutChecks(i) != nullptr); 5390 } 5391 } 5392 5393 self->AllowThreadSuspension(); 5394 return true; 5395} 5396 5397bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5398 CHECK(klass.Get() != nullptr); 5399 return LinkFields(self, klass, false, nullptr); 5400} 5401 5402bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5403 CHECK(klass.Get() != nullptr); 5404 return LinkFields(self, klass, true, class_size); 5405} 5406 5407struct LinkFieldsComparator { 5408 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5409 } 5410 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5411 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5412 NO_THREAD_SAFETY_ANALYSIS { 5413 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5414 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5415 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5416 if (type1 != type2) { 5417 if (type1 == Primitive::kPrimNot) { 5418 // Reference always goes first. 5419 return true; 5420 } 5421 if (type2 == Primitive::kPrimNot) { 5422 // Reference always goes first. 5423 return false; 5424 } 5425 size_t size1 = Primitive::ComponentSize(type1); 5426 size_t size2 = Primitive::ComponentSize(type2); 5427 if (size1 != size2) { 5428 // Larger primitive types go first. 5429 return size1 > size2; 5430 } 5431 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 5432 return type1 < type2; 5433 } 5434 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 5435 // by name and for equal names by type id index. 5436 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 5437 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 5438 } 5439}; 5440 5441bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5442 size_t* class_size) { 5443 self->AllowThreadSuspension(); 5444 size_t num_fields = 5445 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5446 5447 mirror::ObjectArray<mirror::ArtField>* fields = 5448 is_static ? klass->GetSFields() : klass->GetIFields(); 5449 5450 // Initialize field_offset 5451 MemberOffset field_offset(0); 5452 if (is_static) { 5453 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 5454 } else { 5455 mirror::Class* super_class = klass->GetSuperClass(); 5456 if (super_class != nullptr) { 5457 CHECK(super_class->IsResolved()) 5458 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5459 field_offset = MemberOffset(super_class->GetObjectSize()); 5460 } 5461 } 5462 5463 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5464 5465 // we want a relatively stable order so that adding new fields 5466 // minimizes disruption of C++ version such as Class and Method. 5467 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5468 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5469 "Naked ArtField references in deque"); 5470 for (size_t i = 0; i < num_fields; i++) { 5471 mirror::ArtField* f = fields->Get(i); 5472 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5473 grouped_and_sorted_fields.push_back(f); 5474 } 5475 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5476 LinkFieldsComparator()); 5477 5478 // References should be at the front. 5479 size_t current_field = 0; 5480 size_t num_reference_fields = 0; 5481 FieldGaps gaps; 5482 5483 for (; current_field < num_fields; current_field++) { 5484 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5485 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5486 bool isPrimitive = type != Primitive::kPrimNot; 5487 if (isPrimitive) { 5488 break; // past last reference, move on to the next phase 5489 } 5490 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>( 5491 field_offset.Uint32Value()))) { 5492 MemberOffset old_offset = field_offset; 5493 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5494 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5495 } 5496 DCHECK(IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(field_offset.Uint32Value())); 5497 grouped_and_sorted_fields.pop_front(); 5498 num_reference_fields++; 5499 field->SetOffset(field_offset); 5500 field_offset = MemberOffset(field_offset.Uint32Value() + 5501 sizeof(mirror::HeapReference<mirror::Object>)); 5502 } 5503 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5504 // otherwise we could end up with suboptimal gap fills. 5505 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5506 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5507 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5508 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps); 5509 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5510 " fields."; 5511 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5512 5513 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5514 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5515 // We know there are no non-reference fields in the Reference classes, and we know 5516 // that 'referent' is alphabetically last, so this is easy... 5517 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5518 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5519 --num_reference_fields; 5520 } 5521 5522 size_t size = field_offset.Uint32Value(); 5523 // Update klass 5524 if (is_static) { 5525 klass->SetNumReferenceStaticFields(num_reference_fields); 5526 *class_size = size; 5527 } else { 5528 klass->SetNumReferenceInstanceFields(num_reference_fields); 5529 if (!klass->IsVariableSize()) { 5530 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 5531 size_t pointer_size = GetInstructionSetPointerSize(Runtime::Current()->GetInstructionSet()); 5532 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(pointer_size)); 5533 } else { 5534 std::string temp; 5535 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5536 size_t previous_size = klass->GetObjectSize(); 5537 if (previous_size != 0) { 5538 // Make sure that we didn't originally have an incorrect size. 5539 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5540 } 5541 klass->SetObjectSize(size); 5542 } 5543 } 5544 } 5545 5546 if (kIsDebugBuild) { 5547 // Make sure that the fields array is ordered by name but all reference 5548 // offsets are at the beginning as far as alignment allows. 5549 MemberOffset start_ref_offset = is_static 5550 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 5551 : klass->GetFirstReferenceInstanceFieldOffset(); 5552 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 5553 num_reference_fields * 5554 sizeof(mirror::HeapReference<mirror::Object>)); 5555 MemberOffset current_ref_offset = start_ref_offset; 5556 for (size_t i = 0; i < num_fields; i++) { 5557 mirror::ArtField* field = fields->Get(i); 5558 if ((false)) { // enable to debug field layout 5559 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5560 << " class=" << PrettyClass(klass.Get()) 5561 << " field=" << PrettyField(field) 5562 << " offset=" 5563 << field->GetField32(mirror::ArtField::OffsetOffset()); 5564 } 5565 if (i != 0) { 5566 mirror::ArtField* prev_field = fields->Get(i - 1u); 5567 // NOTE: The field names can be the same. This is not possible in the Java language 5568 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 5569 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 5570 } 5571 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5572 bool is_primitive = type != Primitive::kPrimNot; 5573 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5574 strcmp("referent", field->GetName()) == 0) { 5575 is_primitive = true; // We lied above, so we have to expect a lie here. 5576 } 5577 MemberOffset offset = field->GetOffsetDuringLinking(); 5578 if (is_primitive) { 5579 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 5580 // Shuffled before references. 5581 size_t type_size = Primitive::ComponentSize(type); 5582 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 5583 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 5584 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 5585 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 5586 } 5587 } else { 5588 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 5589 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 5590 sizeof(mirror::HeapReference<mirror::Object>)); 5591 } 5592 } 5593 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 5594 } 5595 return true; 5596} 5597 5598// Set the bitmap of reference instance field offsets. 5599void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5600 uint32_t reference_offsets = 0; 5601 mirror::Class* super_class = klass->GetSuperClass(); 5602 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5603 if (super_class != nullptr) { 5604 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5605 // Compute reference offsets unless our superclass overflowed. 5606 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5607 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5608 if (num_reference_fields != 0u) { 5609 // All of the fields that contain object references are guaranteed be grouped in memory 5610 // starting at an appropriately aligned address after super class object data. 5611 uint32_t start_offset = RoundUp(super_class->GetObjectSize(), 5612 sizeof(mirror::HeapReference<mirror::Object>)); 5613 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) / 5614 sizeof(mirror::HeapReference<mirror::Object>); 5615 if (start_bit + num_reference_fields > 32) { 5616 reference_offsets = mirror::Class::kClassWalkSuper; 5617 } else { 5618 reference_offsets |= (0xffffffffu << start_bit) & 5619 (0xffffffffu >> (32 - (start_bit + num_reference_fields))); 5620 } 5621 } 5622 } 5623 } 5624 klass->SetReferenceInstanceOffsets(reference_offsets); 5625} 5626 5627mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5628 Handle<mirror::DexCache> dex_cache) { 5629 DCHECK(dex_cache.Get() != nullptr); 5630 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5631 if (resolved != nullptr) { 5632 return resolved; 5633 } 5634 uint32_t utf16_length; 5635 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5636 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5637 dex_cache->SetResolvedString(string_idx, string); 5638 return string; 5639} 5640 5641mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5642 mirror::Class* referrer) { 5643 StackHandleScope<2> hs(Thread::Current()); 5644 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5645 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5646 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5647} 5648 5649mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5650 Handle<mirror::DexCache> dex_cache, 5651 Handle<mirror::ClassLoader> class_loader) { 5652 DCHECK(dex_cache.Get() != nullptr); 5653 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5654 if (resolved == nullptr) { 5655 Thread* self = Thread::Current(); 5656 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5657 resolved = FindClass(self, descriptor, class_loader); 5658 if (resolved != nullptr) { 5659 // TODO: we used to throw here if resolved's class loader was not the 5660 // boot class loader. This was to permit different classes with the 5661 // same name to be loaded simultaneously by different loaders 5662 dex_cache->SetResolvedType(type_idx, resolved); 5663 } else { 5664 CHECK(self->IsExceptionPending()) 5665 << "Expected pending exception for failed resolution of: " << descriptor; 5666 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5667 StackHandleScope<1> hs(self); 5668 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5669 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5670 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5671 self->ClearException(); 5672 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5673 self->GetException(nullptr)->SetCause(cause.Get()); 5674 } 5675 } 5676 } 5677 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5678 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5679 return resolved; 5680} 5681 5682mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5683 Handle<mirror::DexCache> dex_cache, 5684 Handle<mirror::ClassLoader> class_loader, 5685 Handle<mirror::ArtMethod> referrer, 5686 InvokeType type) { 5687 DCHECK(dex_cache.Get() != nullptr); 5688 // Check for hit in the dex cache. 5689 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5690 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5691 return resolved; 5692 } 5693 // Fail, get the declaring class. 5694 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5695 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5696 if (klass == nullptr) { 5697 DCHECK(Thread::Current()->IsExceptionPending()); 5698 return nullptr; 5699 } 5700 // Scan using method_idx, this saves string compares but will only hit for matching dex 5701 // caches/files. 5702 switch (type) { 5703 case kDirect: // Fall-through. 5704 case kStatic: 5705 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5706 break; 5707 case kInterface: 5708 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5709 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5710 break; 5711 case kSuper: // Fall-through. 5712 case kVirtual: 5713 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5714 break; 5715 default: 5716 LOG(FATAL) << "Unreachable - invocation type: " << type; 5717 UNREACHABLE(); 5718 } 5719 if (resolved == nullptr) { 5720 // Search by name, which works across dex files. 5721 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5722 const Signature signature = dex_file.GetMethodSignature(method_id); 5723 switch (type) { 5724 case kDirect: // Fall-through. 5725 case kStatic: 5726 resolved = klass->FindDirectMethod(name, signature); 5727 break; 5728 case kInterface: 5729 resolved = klass->FindInterfaceMethod(name, signature); 5730 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5731 break; 5732 case kSuper: // Fall-through. 5733 case kVirtual: 5734 resolved = klass->FindVirtualMethod(name, signature); 5735 break; 5736 } 5737 } 5738 // If we found a method, check for incompatible class changes. 5739 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5740 // Be a good citizen and update the dex cache to speed subsequent calls. 5741 dex_cache->SetResolvedMethod(method_idx, resolved); 5742 return resolved; 5743 } else { 5744 // If we had a method, it's an incompatible-class-change error. 5745 if (resolved != nullptr) { 5746 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5747 } else { 5748 // We failed to find the method which means either an access error, an incompatible class 5749 // change, or no such method. First try to find the method among direct and virtual methods. 5750 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5751 const Signature signature = dex_file.GetMethodSignature(method_id); 5752 switch (type) { 5753 case kDirect: 5754 case kStatic: 5755 resolved = klass->FindVirtualMethod(name, signature); 5756 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5757 // have had a resolved method before, which triggers the "true" branch above. 5758 break; 5759 case kInterface: 5760 case kVirtual: 5761 case kSuper: 5762 resolved = klass->FindDirectMethod(name, signature); 5763 break; 5764 } 5765 5766 // If we found something, check that it can be accessed by the referrer. 5767 bool exception_generated = false; 5768 if (resolved != nullptr && referrer.Get() != nullptr) { 5769 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5770 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5771 if (!referring_class->CanAccess(methods_class)) { 5772 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5773 resolved, type); 5774 exception_generated = true; 5775 } else if (!referring_class->CanAccessMember(methods_class, 5776 resolved->GetAccessFlags())) { 5777 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5778 exception_generated = true; 5779 } 5780 } 5781 if (!exception_generated) { 5782 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check 5783 // interface methods and throw if we find the method there. If we find nothing, throw a 5784 // NoSuchMethodError. 5785 switch (type) { 5786 case kDirect: 5787 case kStatic: 5788 if (resolved != nullptr) { 5789 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5790 } else { 5791 resolved = klass->FindInterfaceMethod(name, signature); 5792 if (resolved != nullptr) { 5793 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5794 } else { 5795 ThrowNoSuchMethodError(type, klass, name, signature); 5796 } 5797 } 5798 break; 5799 case kInterface: 5800 if (resolved != nullptr) { 5801 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5802 } else { 5803 resolved = klass->FindVirtualMethod(name, signature); 5804 if (resolved != nullptr) { 5805 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5806 } else { 5807 ThrowNoSuchMethodError(type, klass, name, signature); 5808 } 5809 } 5810 break; 5811 case kSuper: 5812 if (resolved != nullptr) { 5813 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5814 } else { 5815 ThrowNoSuchMethodError(type, klass, name, signature); 5816 } 5817 break; 5818 case kVirtual: 5819 if (resolved != nullptr) { 5820 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5821 } else { 5822 resolved = klass->FindInterfaceMethod(name, signature); 5823 if (resolved != nullptr) { 5824 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5825 } else { 5826 ThrowNoSuchMethodError(type, klass, name, signature); 5827 } 5828 } 5829 break; 5830 } 5831 } 5832 } 5833 Thread::Current()->AssertPendingException(); 5834 return nullptr; 5835 } 5836} 5837 5838mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5839 Handle<mirror::DexCache> dex_cache, 5840 Handle<mirror::ClassLoader> class_loader, 5841 bool is_static) { 5842 DCHECK(dex_cache.Get() != nullptr); 5843 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5844 if (resolved != nullptr) { 5845 return resolved; 5846 } 5847 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5848 Thread* const self = Thread::Current(); 5849 StackHandleScope<1> hs(self); 5850 Handle<mirror::Class> klass( 5851 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5852 if (klass.Get() == nullptr) { 5853 DCHECK(Thread::Current()->IsExceptionPending()); 5854 return nullptr; 5855 } 5856 5857 if (is_static) { 5858 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5859 } else { 5860 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5861 } 5862 5863 if (resolved == nullptr) { 5864 const char* name = dex_file.GetFieldName(field_id); 5865 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5866 if (is_static) { 5867 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5868 } else { 5869 resolved = klass->FindInstanceField(name, type); 5870 } 5871 if (resolved == nullptr) { 5872 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5873 return nullptr; 5874 } 5875 } 5876 dex_cache->SetResolvedField(field_idx, resolved); 5877 return resolved; 5878} 5879 5880mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5881 uint32_t field_idx, 5882 Handle<mirror::DexCache> dex_cache, 5883 Handle<mirror::ClassLoader> class_loader) { 5884 DCHECK(dex_cache.Get() != nullptr); 5885 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5886 if (resolved != nullptr) { 5887 return resolved; 5888 } 5889 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5890 Thread* self = Thread::Current(); 5891 StackHandleScope<1> hs(self); 5892 Handle<mirror::Class> klass( 5893 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5894 if (klass.Get() == nullptr) { 5895 DCHECK(Thread::Current()->IsExceptionPending()); 5896 return nullptr; 5897 } 5898 5899 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5900 StringPiece type(dex_file.StringDataByIdx( 5901 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5902 resolved = mirror::Class::FindField(self, klass, name, type); 5903 if (resolved != nullptr) { 5904 dex_cache->SetResolvedField(field_idx, resolved); 5905 } else { 5906 ThrowNoSuchFieldError("", klass.Get(), type, name); 5907 } 5908 return resolved; 5909} 5910 5911const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5912 uint32_t* length) { 5913 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5914 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5915 const DexFile& dex_file = *dex_cache->GetDexFile(); 5916 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5917 return dex_file.GetMethodShorty(method_id, length); 5918} 5919 5920void ClassLinker::DumpAllClasses(int flags) { 5921 if (dex_cache_image_class_lookup_required_) { 5922 MoveImageClassesToClassTable(); 5923 } 5924 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5925 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5926 std::vector<mirror::Class*> all_classes; 5927 { 5928 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5929 for (GcRoot<mirror::Class>& it : class_table_) { 5930 all_classes.push_back(it.Read()); 5931 } 5932 } 5933 5934 for (size_t i = 0; i < all_classes.size(); ++i) { 5935 all_classes[i]->DumpClass(std::cerr, flags); 5936 } 5937} 5938 5939static OatFile::OatMethod CreateOatMethod(const void* code) { 5940 CHECK(code != nullptr); 5941 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5942 base -= sizeof(void*); // Move backward so that code_offset != 0. 5943 const uint32_t code_offset = sizeof(void*); 5944 return OatFile::OatMethod(base, code_offset); 5945} 5946 5947bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5948 return (entry_point == GetQuickResolutionStub()) || 5949 (quick_resolution_trampoline_ == entry_point); 5950} 5951 5952bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5953 return (entry_point == GetQuickToInterpreterBridge()) || 5954 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5955} 5956 5957bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5958 return (entry_point == GetQuickGenericJniStub()) || 5959 (quick_generic_jni_trampoline_ == entry_point); 5960} 5961 5962const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5963 return GetQuickGenericJniStub(); 5964} 5965 5966void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, 5967 const void* method_code) const { 5968 OatFile::OatMethod oat_method = CreateOatMethod(method_code); 5969 oat_method.LinkMethod(method); 5970 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5971} 5972 5973void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5974 if (!method->IsNative()) { 5975 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5976 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5977 } else { 5978 const void* quick_method_code = GetQuickGenericJniStub(); 5979 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code); 5980 oat_method.LinkMethod(method); 5981 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5982 } 5983} 5984 5985void ClassLinker::DumpForSigQuit(std::ostream& os) { 5986 Thread* self = Thread::Current(); 5987 if (dex_cache_image_class_lookup_required_) { 5988 ScopedObjectAccess soa(self); 5989 MoveImageClassesToClassTable(); 5990 } 5991 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5992 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5993 << class_table_.Size() << "\n"; 5994} 5995 5996size_t ClassLinker::NumLoadedClasses() { 5997 if (dex_cache_image_class_lookup_required_) { 5998 MoveImageClassesToClassTable(); 5999 } 6000 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 6001 // Only return non zygote classes since these are the ones which apps which care about. 6002 return class_table_.Size(); 6003} 6004 6005pid_t ClassLinker::GetClassesLockOwner() { 6006 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 6007} 6008 6009pid_t ClassLinker::GetDexLockOwner() { 6010 return dex_lock_.GetExclusiveOwnerTid(); 6011} 6012 6013void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 6014 DCHECK(!init_done_); 6015 6016 DCHECK(klass != nullptr); 6017 DCHECK(klass->GetClassLoader() == nullptr); 6018 6019 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 6020 DCHECK(class_roots != nullptr); 6021 DCHECK(class_roots->Get(class_root) == nullptr); 6022 class_roots->Set<false>(class_root, klass); 6023} 6024 6025const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 6026 static const char* class_roots_descriptors[] = { 6027 "Ljava/lang/Class;", 6028 "Ljava/lang/Object;", 6029 "[Ljava/lang/Class;", 6030 "[Ljava/lang/Object;", 6031 "Ljava/lang/String;", 6032 "Ljava/lang/DexCache;", 6033 "Ljava/lang/ref/Reference;", 6034 "Ljava/lang/reflect/ArtField;", 6035 "Ljava/lang/reflect/ArtMethod;", 6036 "Ljava/lang/reflect/Proxy;", 6037 "[Ljava/lang/String;", 6038 "[Ljava/lang/reflect/ArtField;", 6039 "[Ljava/lang/reflect/ArtMethod;", 6040 "Ljava/lang/ClassLoader;", 6041 "Ljava/lang/Throwable;", 6042 "Ljava/lang/ClassNotFoundException;", 6043 "Ljava/lang/StackTraceElement;", 6044 "Z", 6045 "B", 6046 "C", 6047 "D", 6048 "F", 6049 "I", 6050 "J", 6051 "S", 6052 "V", 6053 "[Z", 6054 "[B", 6055 "[C", 6056 "[D", 6057 "[F", 6058 "[I", 6059 "[J", 6060 "[S", 6061 "[Ljava/lang/StackTraceElement;", 6062 }; 6063 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 6064 "Mismatch between class descriptors and class-root enum"); 6065 6066 const char* descriptor = class_roots_descriptors[class_root]; 6067 CHECK(descriptor != nullptr); 6068 return descriptor; 6069} 6070 6071std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 6072 const { 6073 std::string temp; 6074 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 6075} 6076 6077bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 6078 const GcRoot<mirror::Class>& b) { 6079 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 6080 return false; 6081 } 6082 std::string temp; 6083 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 6084} 6085 6086std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 6087 const std::pair<const char*, mirror::ClassLoader*>& element) const { 6088 return ComputeModifiedUtf8Hash(element.first); 6089} 6090 6091bool ClassLinker::ClassDescriptorHashEquals::operator()( 6092 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) { 6093 if (a.Read()->GetClassLoader() != b.second) { 6094 return false; 6095 } 6096 return a.Read()->DescriptorEquals(b.first); 6097} 6098 6099bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 6100 const char* descriptor) { 6101 return a.Read()->DescriptorEquals(descriptor); 6102} 6103 6104std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 6105 return ComputeModifiedUtf8Hash(descriptor); 6106} 6107 6108bool ClassLinker::MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m) { 6109 // Non-image methods don't use direct code pointer. 6110 if (!m->GetDeclaringClass()->IsBootStrapClassLoaded()) { 6111 return false; 6112 } 6113 if (m->IsPrivate()) { 6114 // The method can only be called inside its own oat file. Therefore it won't be called using 6115 // its direct code if the oat file has been compiled in PIC mode. 6116 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 6117 const DexFile& dex_file = m->GetDeclaringClass()->GetDexFile(); 6118 const OatFile::OatDexFile* oat_dex_file = class_linker->FindOpenedOatDexFileForDexFile(dex_file); 6119 if (oat_dex_file == nullptr) { 6120 // No oat file: the method has not been compiled. 6121 return false; 6122 } 6123 const OatFile* oat_file = oat_dex_file->GetOatFile(); 6124 return oat_file != nullptr && !oat_file->IsPic(); 6125 } else { 6126 // The method can be called outside its own oat file. Therefore it won't be called using its 6127 // direct code pointer only if all loaded oat files have been compiled in PIC mode. 6128 ReaderMutexLock mu(Thread::Current(), dex_lock_); 6129 for (const OatFile* oat_file : oat_files_) { 6130 if (!oat_file->IsPic()) { 6131 return true; 6132 } 6133 } 6134 return false; 6135 } 6136} 6137 6138} // namespace art 6139