class_linker.cc revision 381e4ca3cc9fc6405ff20e1de873a56d78d51923
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 <memory> 21#include <queue> 22#include <string> 23#include <utility> 24#include <vector> 25 26#include "base/casts.h" 27#include "base/logging.h" 28#include "base/scoped_flock.h" 29#include "base/stl_util.h" 30#include "base/unix_file/fd_file.h" 31#include "class_linker-inl.h" 32#include "compiler_callbacks.h" 33#include "debugger.h" 34#include "dex_file-inl.h" 35#include "gc_root-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "method_helper-inl.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "object_lock.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/dex_cache-inl.h" 54#include "mirror/iftable-inl.h" 55#include "mirror/object-inl.h" 56#include "mirror/object_array-inl.h" 57#include "mirror/proxy.h" 58#include "mirror/reference-inl.h" 59#include "mirror/stack_trace_element.h" 60#include "mirror/string-inl.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 std::string temp; 102 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 103 PrettyDescriptor(c).c_str()); 104 } else { 105 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 106 PrettyDescriptor(c).c_str()); 107 } 108} 109 110static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 111 Thread* self = Thread::Current(); 112 JNIEnv* env = self->GetJniEnv(); 113 114 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 115 CHECK(cause.get() != NULL); 116 117 env->ExceptionClear(); 118 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 119 env->Throw(cause.get()); 120 121 // We only wrap non-Error exceptions; an Error can just be used as-is. 122 if (!is_error) { 123 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 124 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 125 } 126} 127 128static size_t Hash(const char* s) { 129 // This is the java.lang.String hashcode for convenience, not interoperability. 130 size_t hash = 0; 131 for (; *s != '\0'; ++s) { 132 hash = hash * 31 + *s; 133 } 134 return hash; 135} 136 137// Gap between two fields in object layout. 138struct FieldGap { 139 uint32_t start_offset; // The offset from the start of the object. 140 uint32_t size; // The gap size of 1, 2, or 4 bytes. 141}; 142struct FieldGapsComparator { 143 explicit FieldGapsComparator() { 144 } 145 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 146 NO_THREAD_SAFETY_ANALYSIS { 147 // Sort by gap size, largest first. 148 return lhs.size > rhs.size; 149 } 150}; 151typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 152 153// Adds largest aligned gaps to queue of gaps. 154void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 155 DCHECK(gaps != nullptr); 156 157 uint32_t current_offset = gap_start; 158 while (current_offset != gap_end) { 159 size_t remaining = gap_end - current_offset; 160 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 161 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 162 current_offset += sizeof(uint32_t); 163 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 164 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 165 current_offset += sizeof(uint16_t); 166 } else { 167 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 168 current_offset += sizeof(uint8_t); 169 } 170 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 171 } 172} 173// Shuffle fields forward, making use of gaps whenever possible. 174template<int n> 175static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 176 MemberOffset* field_offset, 177 mirror::ObjectArray<mirror::ArtField>* fields, 178 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 179 FieldGaps* gaps) 180 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 181 DCHECK(current_field_idx != nullptr); 182 DCHECK(grouped_and_sorted_fields != nullptr); 183 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 184 DCHECK(gaps != nullptr); 185 DCHECK(field_offset != nullptr); 186 187 DCHECK(IsPowerOfTwo(n)); 188 while (!grouped_and_sorted_fields->empty()) { 189 mirror::ArtField* field = grouped_and_sorted_fields->front(); 190 Primitive::Type type = field->GetTypeAsPrimitiveType(); 191 if (Primitive::ComponentSize(type) < n) { 192 break; 193 } 194 if (!IsAligned<n>(field_offset->Uint32Value())) { 195 MemberOffset old_offset = *field_offset; 196 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 197 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 198 } 199 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 200 grouped_and_sorted_fields->pop_front(); 201 fields->Set<false>(*current_field_idx, field); 202 if (!gaps->empty() && gaps->top().size >= n) { 203 FieldGap gap = gaps->top(); 204 gaps->pop(); 205 DCHECK(IsAligned<n>(gap.start_offset)); 206 field->SetOffset(MemberOffset(gap.start_offset)); 207 if (gap.size > n) { 208 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 209 } 210 } else { 211 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 212 field->SetOffset(*field_offset); 213 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 214 } 215 ++(*current_field_idx); 216 } 217} 218 219const char* ClassLinker::class_roots_descriptors_[] = { 220 "Ljava/lang/Class;", 221 "Ljava/lang/Object;", 222 "[Ljava/lang/Class;", 223 "[Ljava/lang/Object;", 224 "Ljava/lang/String;", 225 "Ljava/lang/DexCache;", 226 "Ljava/lang/ref/Reference;", 227 "Ljava/lang/reflect/ArtField;", 228 "Ljava/lang/reflect/ArtMethod;", 229 "Ljava/lang/reflect/Proxy;", 230 "[Ljava/lang/String;", 231 "[Ljava/lang/reflect/ArtField;", 232 "[Ljava/lang/reflect/ArtMethod;", 233 "Ljava/lang/ClassLoader;", 234 "Ljava/lang/Throwable;", 235 "Ljava/lang/ClassNotFoundException;", 236 "Ljava/lang/StackTraceElement;", 237 "Z", 238 "B", 239 "C", 240 "D", 241 "F", 242 "I", 243 "J", 244 "S", 245 "V", 246 "[Z", 247 "[B", 248 "[C", 249 "[D", 250 "[F", 251 "[I", 252 "[J", 253 "[S", 254 "[Ljava/lang/StackTraceElement;", 255}; 256 257ClassLinker::ClassLinker(InternTable* intern_table) 258 // dex_lock_ is recursive as it may be used in stack dumping. 259 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 260 dex_cache_image_class_lookup_required_(false), 261 failed_dex_cache_class_lookups_(0), 262 class_roots_(nullptr), 263 array_iftable_(nullptr), 264 find_array_class_cache_next_victim_(0), 265 init_done_(false), 266 log_new_dex_caches_roots_(false), 267 log_new_class_table_roots_(false), 268 intern_table_(intern_table), 269 portable_resolution_trampoline_(nullptr), 270 quick_resolution_trampoline_(nullptr), 271 portable_imt_conflict_trampoline_(nullptr), 272 quick_imt_conflict_trampoline_(nullptr), 273 quick_generic_jni_trampoline_(nullptr), 274 quick_to_interpreter_bridge_trampoline_(nullptr) { 275 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 276 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 277} 278 279// To set a value for generic JNI. May be necessary in compiler tests. 280extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 281extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 282extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 283extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 284 285void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 286 VLOG(startup) << "ClassLinker::Init"; 287 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 288 289 CHECK(!init_done_); 290 291 // java_lang_Class comes first, it's needed for AllocClass 292 Thread* self = Thread::Current(); 293 gc::Heap* heap = Runtime::Current()->GetHeap(); 294 // The GC can't handle an object with a null class since we can't get the size of this object. 295 heap->IncrementDisableMovingGC(self); 296 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 297 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 298 heap->AllocNonMovableObject<true>(self, nullptr, 299 mirror::Class::ClassClassSize(), 300 VoidFunctor())))); 301 CHECK(java_lang_Class.Get() != NULL); 302 mirror::Class::SetClassClass(java_lang_Class.Get()); 303 java_lang_Class->SetClass(java_lang_Class.Get()); 304 if (kUseBakerOrBrooksReadBarrier) { 305 java_lang_Class->AssertReadBarrierPointer(); 306 } 307 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 308 heap->DecrementDisableMovingGC(self); 309 // AllocClass(mirror::Class*) can now be used 310 311 // Class[] is used for reflection support. 312 Handle<mirror::Class> class_array_class(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 314 class_array_class->SetComponentType(java_lang_Class.Get()); 315 316 // java_lang_Object comes next so that object_array_class can be created. 317 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 318 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 319 CHECK(java_lang_Object.Get() != NULL); 320 // backfill Object as the super class of Class. 321 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 322 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 323 324 // Object[] next to hold class roots. 325 Handle<mirror::Class> object_array_class(hs.NewHandle( 326 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 327 object_array_class->SetComponentType(java_lang_Object.Get()); 328 329 // Setup the char (primitive) class to be used for char[]. 330 Handle<mirror::Class> char_class(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 332 333 // Setup the char[] class to be used for String. 334 Handle<mirror::Class> char_array_class(hs.NewHandle( 335 AllocClass(self, java_lang_Class.Get(), 336 mirror::Array::ClassSize()))); 337 char_array_class->SetComponentType(char_class.Get()); 338 mirror::CharArray::SetArrayClass(char_array_class.Get()); 339 340 // Setup String. 341 Handle<mirror::Class> java_lang_String(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 343 mirror::String::SetClass(java_lang_String.Get()); 344 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 345 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 346 347 // Setup Reference. 348 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 350 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 351 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 352 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 353 354 // Create storage for root classes, save away our work so far (requires descriptors). 355 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 356 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 357 kClassRootsMax)); 358 CHECK(!class_roots_.IsNull()); 359 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 360 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 361 SetClassRoot(kClassArrayClass, class_array_class.Get()); 362 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 363 SetClassRoot(kCharArrayClass, char_array_class.Get()); 364 SetClassRoot(kJavaLangString, java_lang_String.Get()); 365 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 366 367 // Setup the primitive type classes. 368 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 369 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 370 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 371 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 372 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 373 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 374 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 375 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 376 377 // Create array interface entries to populate once we can load system classes. 378 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 379 380 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 381 Handle<mirror::Class> int_array_class(hs.NewHandle( 382 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 383 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 384 mirror::IntArray::SetArrayClass(int_array_class.Get()); 385 SetClassRoot(kIntArrayClass, int_array_class.Get()); 386 387 // now that these are registered, we can use AllocClass() and AllocObjectArray 388 389 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 390 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 392 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 393 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 394 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 395 396 // Constructor, Field, Method, and AbstractMethod are necessary so 397 // that FindClass can link members. 398 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 399 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 400 CHECK(java_lang_reflect_ArtField.Get() != NULL); 401 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 402 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 403 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 404 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 405 406 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 408 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 409 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 410 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 411 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 412 413 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 414 415 // Set up array classes for string, field, method 416 Handle<mirror::Class> object_array_string(hs.NewHandle( 417 AllocClass(self, java_lang_Class.Get(), 418 mirror::ObjectArray<mirror::String>::ClassSize()))); 419 object_array_string->SetComponentType(java_lang_String.Get()); 420 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 421 422 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 423 AllocClass(self, java_lang_Class.Get(), 424 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 425 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 426 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 427 428 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 429 AllocClass(self, java_lang_Class.Get(), 430 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 431 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 432 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 433 434 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 435 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 436 // these roots. 437 CHECK_NE(0U, boot_class_path.size()); 438 for (size_t i = 0; i != boot_class_path.size(); ++i) { 439 const DexFile* dex_file = boot_class_path[i]; 440 CHECK(dex_file != NULL); 441 AppendToBootClassPath(*dex_file); 442 } 443 444 // now we can use FindSystemClass 445 446 // run char class through InitializePrimitiveClass to finish init 447 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 448 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 449 450 // Create runtime resolution and imt conflict methods. Also setup the default imt. 451 Runtime* runtime = Runtime::Current(); 452 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 453 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 454 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 455 456 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 457 // we do not need friend classes or a publicly exposed setter. 458 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 459 if (!runtime->IsCompiler()) { 460 // We need to set up the generic trampolines since we don't have an image. 461 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 462 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 463 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 464 } 465 466 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 467 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 468 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 469 CHECK_EQ(java_lang_Object.Get(), Object_class); 470 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 471 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 472 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 473 std::ostringstream os1, os2; 474 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 475 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 476 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 477 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 478 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 479 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 480 CHECK_EQ(java_lang_String.Get(), String_class); 481 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 482 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 483 484 // Setup the primitive array type classes - can't be done until Object has a vtable. 485 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 486 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 487 488 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 489 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 490 491 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 492 CHECK_EQ(char_array_class.Get(), found_char_array_class); 493 494 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 495 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 496 497 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 498 CHECK_EQ(int_array_class.Get(), found_int_array_class); 499 500 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 501 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 502 503 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 504 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 505 506 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 507 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 508 509 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 510 CHECK_EQ(class_array_class.Get(), found_class_array_class); 511 512 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 513 CHECK_EQ(object_array_class.Get(), found_object_array_class); 514 515 // Setup the single, global copy of "iftable". 516 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 517 CHECK(java_lang_Cloneable != NULL); 518 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 519 CHECK(java_io_Serializable != NULL); 520 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 521 // crawl up and explicitly list all of the supers as well. 522 { 523 mirror::IfTable* array_iftable = array_iftable_.Read(); 524 array_iftable->SetInterface(0, java_lang_Cloneable); 525 array_iftable->SetInterface(1, java_io_Serializable); 526 } 527 528 // Sanity check Class[] and Object[]'s interfaces. 529 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 530 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 531 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 532 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 533 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 534 // dex_cache_ fields and register them in class_table_. 535 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 536 CHECK_EQ(java_lang_Class.Get(), Class_class); 537 538 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 539 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 540 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 541 542 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 543 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 544 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 545 546 mirror::Class* String_array_class = 547 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 548 CHECK_EQ(object_array_string.Get(), String_array_class); 549 550 mirror::Class* Art_method_array_class = 551 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 552 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 553 554 mirror::Class* Art_field_array_class = 555 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 556 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 557 558 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 559 560 // Create java.lang.reflect.Proxy root. 561 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 562 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 563 564 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 565 // finish initializing Reference class 566 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 567 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 568 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 569 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 570 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 571 mirror::Class* java_lang_ref_FinalizerReference = 572 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 573 java_lang_ref_FinalizerReference->SetAccessFlags( 574 java_lang_ref_FinalizerReference->GetAccessFlags() | 575 kAccClassIsReference | kAccClassIsFinalizerReference); 576 mirror::Class* java_lang_ref_PhantomReference = 577 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 578 java_lang_ref_PhantomReference->SetAccessFlags( 579 java_lang_ref_PhantomReference->GetAccessFlags() | 580 kAccClassIsReference | kAccClassIsPhantomReference); 581 mirror::Class* java_lang_ref_SoftReference = 582 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 583 java_lang_ref_SoftReference->SetAccessFlags( 584 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 585 mirror::Class* java_lang_ref_WeakReference = 586 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 587 java_lang_ref_WeakReference->SetAccessFlags( 588 java_lang_ref_WeakReference->GetAccessFlags() | 589 kAccClassIsReference | kAccClassIsWeakReference); 590 591 // Setup the ClassLoader, verifying the object_size_. 592 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 593 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 594 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 595 596 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 597 // java.lang.StackTraceElement as a convenience. 598 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 599 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 600 SetClassRoot(kJavaLangClassNotFoundException, 601 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 602 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 603 SetClassRoot(kJavaLangStackTraceElementArrayClass, 604 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 605 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 606 607 FinishInit(self); 608 609 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 610} 611 612void ClassLinker::FinishInit(Thread* self) { 613 VLOG(startup) << "ClassLinker::FinishInit entering"; 614 615 // Let the heap know some key offsets into java.lang.ref instances 616 // Note: we hard code the field indexes here rather than using FindInstanceField 617 // as the types of the field can't be resolved prior to the runtime being 618 // fully initialized 619 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 620 mirror::Class* java_lang_ref_FinalizerReference = 621 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 622 623 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 624 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 625 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 626 627 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 628 CHECK_STREQ(queue->GetName(), "queue"); 629 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 630 631 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 632 CHECK_STREQ(queueNext->GetName(), "queueNext"); 633 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 634 635 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 636 CHECK_STREQ(referent->GetName(), "referent"); 637 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 638 639 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 640 CHECK_STREQ(zombie->GetName(), "zombie"); 641 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 642 643 // ensure all class_roots_ are initialized 644 for (size_t i = 0; i < kClassRootsMax; i++) { 645 ClassRoot class_root = static_cast<ClassRoot>(i); 646 mirror::Class* klass = GetClassRoot(class_root); 647 CHECK(klass != NULL); 648 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 649 // note SetClassRoot does additional validation. 650 // if possible add new checks there to catch errors early 651 } 652 653 CHECK(!array_iftable_.IsNull()); 654 655 // disable the slow paths in FindClass and CreatePrimitiveClass now 656 // that Object, Class, and Object[] are setup 657 init_done_ = true; 658 659 VLOG(startup) << "ClassLinker::FinishInit exiting"; 660} 661 662void ClassLinker::RunRootClinits() { 663 Thread* self = Thread::Current(); 664 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 665 mirror::Class* c = GetClassRoot(ClassRoot(i)); 666 if (!c->IsArrayClass() && !c->IsPrimitive()) { 667 StackHandleScope<1> hs(self); 668 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 669 EnsureInitialized(h_class, true, true); 670 self->AssertNoPendingException(); 671 } 672 } 673} 674 675bool ClassLinker::GenerateOatFile(const char* dex_filename, 676 int oat_fd, 677 const char* oat_cache_filename, 678 std::string* error_msg) { 679 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 680 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 681 682 gc::Heap* heap = Runtime::Current()->GetHeap(); 683 std::string boot_image_option("--boot-image="); 684 if (heap->GetImageSpace() == nullptr) { 685 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 686 // out of space anyway it might not matter. 687 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 688 "without an image.", dex_filename); 689 return false; 690 } 691 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 692 693 std::string dex_file_option("--dex-file="); 694 dex_file_option += dex_filename; 695 696 std::string oat_fd_option("--oat-fd="); 697 StringAppendF(&oat_fd_option, "%d", oat_fd); 698 699 std::string oat_location_option("--oat-location="); 700 oat_location_option += oat_cache_filename; 701 702 std::vector<std::string> argv; 703 argv.push_back(dex2oat); 704 argv.push_back("--runtime-arg"); 705 argv.push_back("-classpath"); 706 argv.push_back("--runtime-arg"); 707 argv.push_back(Runtime::Current()->GetClassPathString()); 708 709 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 710 711 if (!Runtime::Current()->IsVerificationEnabled()) { 712 argv.push_back("--compiler-filter=verify-none"); 713 } 714 715 if (Runtime::Current()->MustRelocateIfPossible()) { 716 argv.push_back("--runtime-arg"); 717 argv.push_back("-Xrelocate"); 718 } else { 719 argv.push_back("--runtime-arg"); 720 argv.push_back("-Xnorelocate"); 721 } 722 723 if (!kIsTargetBuild) { 724 argv.push_back("--host"); 725 } 726 727 argv.push_back(boot_image_option); 728 argv.push_back(dex_file_option); 729 argv.push_back(oat_fd_option); 730 argv.push_back(oat_location_option); 731 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 732 for (size_t i = 0; i < compiler_options.size(); ++i) { 733 argv.push_back(compiler_options[i].c_str()); 734 } 735 736 return Exec(argv, error_msg); 737} 738 739const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 740 WriterMutexLock mu(Thread::Current(), dex_lock_); 741 if (kIsDebugBuild) { 742 for (size_t i = 0; i < oat_files_.size(); ++i) { 743 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 744 } 745 } 746 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 747 oat_files_.push_back(oat_file); 748 return oat_file; 749} 750 751OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 752 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 753 OatFile* oat_file = space->ReleaseOatFile(); 754 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 755 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 756 return *oat_file; 757} 758 759const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 760 const char* dex_location = dex_file.GetLocation().c_str(); 761 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 762 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 763} 764 765const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 766 const uint32_t* const dex_location_checksum) { 767 ReaderMutexLock mu(Thread::Current(), dex_lock_); 768 for (size_t i = 0; i < oat_files_.size(); i++) { 769 const OatFile* oat_file = oat_files_[i]; 770 DCHECK(oat_file != NULL); 771 772 if (oat_location != nullptr) { 773 if (oat_file->GetLocation() != oat_location) { 774 continue; 775 } 776 } 777 778 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 779 dex_location_checksum, 780 false); 781 if (oat_dex_file != NULL) { 782 return oat_file; 783 } 784 } 785 return NULL; 786} 787 788static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 789 bool generated, 790 std::vector<std::string>* error_msgs, 791 std::vector<const DexFile*>* dex_files) { 792 if (oat_file == nullptr) { 793 return false; 794 } 795 796 size_t old_size = dex_files->size(); // To rollback on error. 797 798 bool success = true; 799 for (size_t i = 0; success; ++i) { 800 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 801 const char* next_name = next_name_str.c_str(); 802 803 uint32_t dex_location_checksum; 804 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 805 std::string error_msg; 806 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 807 DCHECK_EQ(false, i == 0 && generated); 808 dex_location_checksum_pointer = nullptr; 809 } 810 811 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 812 813 if (oat_dex_file == nullptr) { 814 if (i == 0 && generated) { 815 std::string error_msg; 816 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 817 " file'%s'", dex_location, dex_location_checksum, 818 oat_file->GetLocation().c_str()); 819 error_msgs->push_back(error_msg); 820 } 821 break; // Not found, done. 822 } 823 824 // Checksum test. Test must succeed when generated. 825 success = !generated; 826 if (dex_location_checksum_pointer != nullptr) { 827 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 828 } 829 830 if (success) { 831 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 832 if (dex_file == nullptr) { 833 success = false; 834 error_msgs->push_back(error_msg); 835 } else { 836 dex_files->push_back(dex_file); 837 } 838 } 839 840 // When we generated the file, we expect success, or something is terribly wrong. 841 CHECK_EQ(false, generated && !success) 842 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 843 << std::hex << " dex_location_checksum=" << dex_location_checksum 844 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 845 } 846 847 if (dex_files->size() == old_size) { 848 success = false; // We did not even find classes.dex 849 } 850 851 if (success) { 852 return true; 853 } else { 854 // Free all the dex files we have loaded. 855 auto it = dex_files->begin() + old_size; 856 auto it_end = dex_files->end(); 857 for (; it != it_end; it++) { 858 delete *it; 859 } 860 dex_files->erase(dex_files->begin() + old_size, it_end); 861 862 return false; 863 } 864} 865 866// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 867// complicates the loading process, as we should not use an iterative loading process, because that 868// would register the oat file and dex files that come before the broken one. Instead, check all 869// multidex ahead of time. 870bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 871 std::vector<std::string>* error_msgs, 872 std::vector<const DexFile*>* dex_files) { 873 // 1) Check whether we have an open oat file. 874 // This requires a dex checksum, use the "primary" one. 875 uint32_t dex_location_checksum; 876 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 877 bool have_checksum = true; 878 std::string checksum_error_msg; 879 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 880 dex_location_checksum_pointer = nullptr; 881 have_checksum = false; 882 } 883 884 bool needs_registering = false; 885 886 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 887 dex_location_checksum_pointer)); 888 889 // 2) If we do not have an open one, maybe there's one on disk already. 890 891 // In case the oat file is not open, we play a locking game here so 892 // that if two different processes race to load and register or generate 893 // (or worse, one tries to open a partial generated file) we will be okay. 894 // This is actually common with apps that use DexClassLoader to work 895 // around the dex method reference limit and that have a background 896 // service running in a separate process. 897 ScopedFlock scoped_flock; 898 899 if (open_oat_file.get() == nullptr) { 900 if (oat_location != nullptr) { 901 // Can only do this if we have a checksum, else error. 902 if (!have_checksum) { 903 error_msgs->push_back(checksum_error_msg); 904 return false; 905 } 906 907 std::string error_msg; 908 909 // We are loading or creating one in the future. Time to set up the file lock. 910 if (!scoped_flock.Init(oat_location, &error_msg)) { 911 error_msgs->push_back(error_msg); 912 return false; 913 } 914 915 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 916 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 917 oat_location, &error_msg)); 918 919 if (open_oat_file.get() == nullptr) { 920 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 921 dex_location, oat_location, error_msg.c_str()); 922 VLOG(class_linker) << compound_msg; 923 error_msgs->push_back(compound_msg); 924 } 925 } else { 926 // TODO: What to lock here? 927 bool obsolete_file_cleanup_failed; 928 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 929 dex_location_checksum_pointer, 930 kRuntimeISA, error_msgs, 931 &obsolete_file_cleanup_failed)); 932 // There's no point in going forward and eventually try to regenerate the 933 // file if we couldn't remove the obsolete one. Mostly likely we will fail 934 // with the same error when trying to write the new file. 935 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 936 if (obsolete_file_cleanup_failed) { 937 return false; 938 } 939 } 940 needs_registering = true; 941 } 942 943 // 3) If we have an oat file, check all contained multidex files for our dex_location. 944 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 945 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 946 dex_files); 947 if (success) { 948 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 949 if (needs_registering) { 950 // We opened the oat file, so we must register it. 951 RegisterOatFile(oat_file); 952 } 953 // If the file isn't executable we failed patchoat but did manage to get the dex files. 954 return oat_file->IsExecutable(); 955 } else { 956 if (needs_registering) { 957 // We opened it, delete it. 958 open_oat_file.reset(); 959 } else { 960 open_oat_file.release(); // Do not delete open oat files. 961 } 962 } 963 964 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 965 966 // Need a checksum, fail else. 967 if (!have_checksum) { 968 error_msgs->push_back(checksum_error_msg); 969 return false; 970 } 971 972 // Look in cache location if no oat_location is given. 973 std::string cache_location; 974 if (oat_location == nullptr) { 975 // Use the dalvik cache. 976 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 977 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 978 oat_location = cache_location.c_str(); 979 } 980 981 bool has_flock = true; 982 // Definitely need to lock now. 983 if (!scoped_flock.HasFile()) { 984 std::string error_msg; 985 if (!scoped_flock.Init(oat_location, &error_msg)) { 986 error_msgs->push_back(error_msg); 987 has_flock = false; 988 } 989 } 990 991 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 992 // Create the oat file. 993 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 994 oat_location, error_msgs)); 995 } 996 997 // Failed, bail. 998 if (open_oat_file.get() == nullptr) { 999 std::string error_msg; 1000 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1001 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1002 error_msgs->push_back(error_msg); 1003 return false; 1004 } 1005 1006 // Try to load again, but stronger checks. 1007 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 1008 dex_files); 1009 if (success) { 1010 RegisterOatFile(open_oat_file.release()); 1011 return true; 1012 } else { 1013 return false; 1014 } 1015} 1016 1017const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1018 uint32_t dex_location_checksum, 1019 const char* oat_location, 1020 std::string* error_msg) { 1021 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1022 !Runtime::Current()->IsCompiler(), 1023 error_msg)); 1024 if (oat_file.get() == nullptr) { 1025 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1026 error_msg->c_str()); 1027 return nullptr; 1028 } 1029 Runtime* runtime = Runtime::Current(); 1030 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 1031 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1032 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1033 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1034 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1035 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1036 actual_image_oat_checksum); 1037 return nullptr; 1038 } 1039 1040 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1041 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1042 if (expected_image_oat_offset != actual_image_oat_offset) { 1043 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1044 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1045 actual_image_oat_offset); 1046 return nullptr; 1047 } 1048 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1049 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1050 if (expected_patch_delta != actual_patch_delta) { 1051 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1052 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1053 return nullptr; 1054 } 1055 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1056 &dex_location_checksum); 1057 if (oat_dex_file == nullptr) { 1058 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1059 dex_location); 1060 return nullptr; 1061 } 1062 uint32_t expected_dex_checksum = dex_location_checksum; 1063 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1064 if (expected_dex_checksum != actual_dex_checksum) { 1065 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1066 "found 0x%x", oat_location, expected_dex_checksum, 1067 actual_dex_checksum); 1068 return nullptr; 1069 } 1070 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1071 if (dex_file.get() != nullptr) { 1072 return oat_file.release(); 1073 } else { 1074 return nullptr; 1075 } 1076} 1077 1078const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1079 int fd, const char* oat_location, 1080 std::vector<std::string>* error_msgs) { 1081 // Generate the output oat file for the dex file 1082 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1083 std::string error_msg; 1084 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1085 CHECK(!error_msg.empty()); 1086 error_msgs->push_back(error_msg); 1087 return nullptr; 1088 } 1089 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1090 !Runtime::Current()->IsCompiler(), 1091 &error_msg)); 1092 if (oat_file.get() == nullptr) { 1093 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1094 oat_location, error_msg.c_str()); 1095 error_msgs->push_back(compound_msg); 1096 return nullptr; 1097 } 1098 1099 return oat_file.release(); 1100} 1101 1102bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1103 const InstructionSet instruction_set) { 1104 Runtime* runtime = Runtime::Current(); 1105 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1106 if (image_space == nullptr) { 1107 return false; 1108 } 1109 uint32_t image_oat_checksum = 0; 1110 if (instruction_set == kRuntimeISA) { 1111 const ImageHeader& image_header = image_space->GetImageHeader(); 1112 image_oat_checksum = image_header.GetOatChecksum(); 1113 } else { 1114 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1115 image_space->GetImageLocation().c_str(), instruction_set)); 1116 image_oat_checksum = image_header->GetOatChecksum(); 1117 } 1118 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1119} 1120 1121bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1122 const InstructionSet instruction_set, 1123 std::string* error_msg) { 1124 Runtime* runtime = Runtime::Current(); 1125 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1126 if (image_space == nullptr) { 1127 *error_msg = "No image space for verification against"; 1128 return false; 1129 } 1130 1131 // If the requested instruction set is the same as the current runtime, 1132 // we can use the checksums directly. If it isn't, we'll have to read the 1133 // image header from the image for the right instruction set. 1134 uint32_t image_oat_checksum = 0; 1135 uintptr_t image_oat_data_begin = 0; 1136 int32_t image_patch_delta = 0; 1137 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1138 const ImageHeader& image_header = image_space->GetImageHeader(); 1139 image_oat_checksum = image_header.GetOatChecksum(); 1140 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1141 image_patch_delta = image_header.GetPatchDelta(); 1142 } else { 1143 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1144 image_space->GetImageLocation().c_str(), instruction_set)); 1145 image_oat_checksum = image_header->GetOatChecksum(); 1146 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1147 image_patch_delta = image_header->GetPatchDelta(); 1148 } 1149 const OatHeader& oat_header = oat_file->GetOatHeader(); 1150 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1151 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1152 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1153 if (!ret) { 1154 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1155 oat_file->GetLocation().c_str(), 1156 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1157 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1158 oat_file->GetOatHeader().GetImagePatchDelta(), 1159 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1160 } 1161 return ret; 1162} 1163 1164bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1165 const char* dex_location, 1166 uint32_t dex_location_checksum, 1167 const InstructionSet instruction_set, 1168 std::string* error_msg) { 1169 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1170 return false; 1171 } 1172 1173 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1174 &dex_location_checksum); 1175 if (oat_dex_file == NULL) { 1176 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1177 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1178 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1179 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1180 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1181 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1182 oat_file->GetLocation().c_str(), 1183 oat_dex_file->GetDexFileLocation().c_str()); 1184 } 1185 return false; 1186 } 1187 1188 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1189 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1190 oat_file->GetLocation().c_str(), 1191 oat_dex_file->GetDexFileLocationChecksum(), 1192 dex_location, dex_location_checksum); 1193 return false; 1194 } 1195 return true; 1196} 1197 1198bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1199 const char* dex_location, 1200 std::string* error_msg) { 1201 CHECK(oat_file != nullptr); 1202 CHECK(dex_location != nullptr); 1203 std::unique_ptr<const DexFile> dex_file; 1204 uint32_t dex_location_checksum; 1205 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1206 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1207 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1208 // directory. 1209 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1210 if (oat_dex_file == nullptr) { 1211 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1212 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1213 error_msg->c_str()); 1214 return false; 1215 } 1216 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1217 } else { 1218 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1219 kRuntimeISA, error_msg); 1220 if (!verified) { 1221 return false; 1222 } 1223 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1224 &dex_location_checksum)->OpenDexFile(error_msg)); 1225 } 1226 return dex_file.get() != nullptr; 1227} 1228 1229const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1230 const char* dex_location, 1231 const uint32_t* const dex_location_checksum, 1232 InstructionSet isa, 1233 std::vector<std::string>* error_msgs, 1234 bool* obsolete_file_cleanup_failed) { 1235 *obsolete_file_cleanup_failed = false; 1236 bool already_opened = false; 1237 std::string dex_location_str(dex_location); 1238 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1239 &already_opened, 1240 obsolete_file_cleanup_failed, 1241 error_msgs)); 1242 std::string error_msg; 1243 if (oat_file.get() == nullptr) { 1244 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1245 dex_location)); 1246 return nullptr; 1247 } else if (oat_file->IsExecutable() && 1248 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1249 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1250 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1251 error_msg.c_str())); 1252 return nullptr; 1253 } else if (!oat_file->IsExecutable() && 1254 Runtime::Current()->GetHeap()->HasImageSpace() && 1255 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1256 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1257 "dex location '%s'. Image checksum incorrect.", 1258 oat_file->GetLocation().c_str(), dex_location)); 1259 return nullptr; 1260 } else { 1261 return oat_file.release(); 1262 } 1263} 1264 1265const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1266 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1267 for (size_t i = 0; i < oat_files_.size(); i++) { 1268 const OatFile* oat_file = oat_files_[i]; 1269 DCHECK(oat_file != nullptr); 1270 if (oat_file->GetLocation() == oat_location) { 1271 return oat_file; 1272 } 1273 } 1274 return nullptr; 1275} 1276 1277const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1278 InstructionSet isa, 1279 bool *already_opened, 1280 bool *obsolete_file_cleanup_failed, 1281 std::vector<std::string>* error_msgs) { 1282 // Find out if we've already opened the file 1283 const OatFile* ret = nullptr; 1284 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1285 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1286 if (ret != nullptr) { 1287 *already_opened = true; 1288 return ret; 1289 } 1290 1291 std::string dalvik_cache; 1292 bool have_android_data = false; 1293 bool have_dalvik_cache = false; 1294 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1295 &have_android_data, &have_dalvik_cache); 1296 std::string cache_filename; 1297 if (have_dalvik_cache) { 1298 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1299 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1300 if (ret != nullptr) { 1301 *already_opened = true; 1302 return ret; 1303 } 1304 } else { 1305 // If we need to relocate we should just place odex back where it started. 1306 cache_filename = odex_filename; 1307 } 1308 1309 ret = nullptr; 1310 1311 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1312 // 1313 // Now we do the following: 1314 // 1) Try and open the odex version 1315 // 2) If present, checksum-verified & relocated correctly return it 1316 // 3) Close the odex version to free up its address space. 1317 // 4) Try and open the cache version 1318 // 5) If present, checksum-verified & relocated correctly return it 1319 // 6) Close the cache version to free up its address space. 1320 // 7) If we should relocate: 1321 // a) If we have opened and checksum-verified the odex version relocate it to 1322 // 'cache_filename' and return it 1323 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1324 // it. This should not happen often (I think only the run-test's will hit this case). 1325 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1326 // this point. 1327 // 9) Return nullptr 1328 1329 *already_opened = false; 1330 const Runtime* runtime = Runtime::Current(); 1331 CHECK(runtime != nullptr); 1332 bool executable = !runtime->IsCompiler(); 1333 1334 std::string odex_error_msg; 1335 bool should_patch_system = false; 1336 bool odex_checksum_verified = false; 1337 bool have_system_odex = false; 1338 { 1339 // There is a high probability that these both these oat files map similar/the same address 1340 // spaces so we must scope them like this so they each gets its turn. 1341 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1342 executable, &odex_error_msg)); 1343 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1344 &odex_checksum_verified, 1345 &odex_error_msg)) { 1346 error_msgs->push_back(odex_error_msg); 1347 return odex_oat_file.release(); 1348 } else { 1349 if (odex_checksum_verified) { 1350 // We can just relocate 1351 should_patch_system = true; 1352 odex_error_msg = "Image Patches are incorrect"; 1353 } 1354 if (odex_oat_file.get() != nullptr) { 1355 have_system_odex = true; 1356 } 1357 } 1358 } 1359 1360 std::string cache_error_msg; 1361 bool should_patch_cache = false; 1362 bool cache_checksum_verified = false; 1363 if (have_dalvik_cache) { 1364 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1365 executable, &cache_error_msg)); 1366 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1367 &cache_checksum_verified, 1368 &cache_error_msg)) { 1369 error_msgs->push_back(cache_error_msg); 1370 return cache_oat_file.release(); 1371 } else if (cache_checksum_verified) { 1372 // We can just relocate 1373 should_patch_cache = true; 1374 cache_error_msg = "Image Patches are incorrect"; 1375 } 1376 } else if (have_android_data) { 1377 // dalvik_cache does not exist but android data does. This means we should be able to create 1378 // it, so we should try. 1379 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1380 } 1381 1382 ret = nullptr; 1383 std::string error_msg; 1384 if (runtime->CanRelocate()) { 1385 // Run relocation 1386 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1387 if (space != nullptr) { 1388 const std::string& image_location = space->GetImageLocation(); 1389 if (odex_checksum_verified && should_patch_system) { 1390 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1391 } else if (cache_checksum_verified && should_patch_cache) { 1392 CHECK(have_dalvik_cache); 1393 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1394 } 1395 } else if (have_system_odex) { 1396 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1397 } 1398 } 1399 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1400 // implicitly: were able to fine where the cached version is but we were unable to use it, 1401 // either as a destination for relocation or to open a file. We should delete it if it is 1402 // there. 1403 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1404 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1405 "searching for dex file %s: %s", 1406 cache_filename.c_str(), dex_location.c_str(), 1407 strerror(errno)); 1408 error_msgs->push_back(rm_error_msg); 1409 VLOG(class_linker) << rm_error_msg; 1410 // Let the caller know that we couldn't remove the obsolete file. 1411 // This is a good indication that further writes may fail as well. 1412 *obsolete_file_cleanup_failed = true; 1413 } 1414 } 1415 if (ret == nullptr) { 1416 VLOG(class_linker) << error_msg; 1417 error_msgs->push_back(error_msg); 1418 std::string relocation_msg; 1419 if (runtime->CanRelocate()) { 1420 relocation_msg = StringPrintf(" and relocation failed"); 1421 } 1422 if (have_dalvik_cache && cache_checksum_verified) { 1423 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1424 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1425 cache_filename.c_str(), cache_error_msg.c_str(), 1426 relocation_msg.c_str()); 1427 } else { 1428 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1429 "dalvik_cache availible)%s.", odex_filename.c_str(), 1430 odex_error_msg.c_str(), relocation_msg.c_str()); 1431 } 1432 VLOG(class_linker) << error_msg; 1433 error_msgs->push_back(error_msg); 1434 } 1435 return ret; 1436} 1437 1438const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1439 InstructionSet isa, 1440 std::string* error_msg) { 1441 // We open it non-executable 1442 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1443 if (output.get() == nullptr) { 1444 return nullptr; 1445 } 1446 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1447 VerifyOatImageChecksum(output.get(), isa)) { 1448 return output.release(); 1449 } else { 1450 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1451 oat_path.c_str()); 1452 return nullptr; 1453 } 1454} 1455 1456const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1457 const std::string& output_oat, 1458 const std::string& image_location, 1459 InstructionSet isa, 1460 std::string* error_msg) { 1461 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1462 // We don't have an image space so there is no point in trying to patchoat. 1463 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1464 << "running without an image. Attempting to use oat file for interpretation."; 1465 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1466 } 1467 if (!Runtime::Current()->IsDex2OatEnabled()) { 1468 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1469 // input_oat but make sure we only do interpretation on it's dex files. 1470 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1471 << "disabled. Attempting to use oat file for interpretation"; 1472 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1473 } 1474 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1475 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1476 1477 std::string isa_arg("--instruction-set="); 1478 isa_arg += GetInstructionSetString(isa); 1479 std::string input_oat_filename_arg("--input-oat-file="); 1480 input_oat_filename_arg += input_oat; 1481 std::string output_oat_filename_arg("--output-oat-file="); 1482 output_oat_filename_arg += output_oat; 1483 std::string patched_image_arg("--patched-image-location="); 1484 patched_image_arg += image_location; 1485 1486 std::vector<std::string> argv; 1487 argv.push_back(patchoat); 1488 argv.push_back(isa_arg); 1489 argv.push_back(input_oat_filename_arg); 1490 argv.push_back(output_oat_filename_arg); 1491 argv.push_back(patched_image_arg); 1492 1493 std::string command_line(Join(argv, ' ')); 1494 LOG(INFO) << "Relocate Oat File: " << command_line; 1495 bool success = Exec(argv, error_msg); 1496 if (success) { 1497 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1498 !Runtime::Current()->IsCompiler(), error_msg)); 1499 bool checksum_verified = false; 1500 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1501 return output.release(); 1502 } else if (output.get() != nullptr) { 1503 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1504 "but output file '%s' failed verifcation: %s", 1505 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1506 } else { 1507 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1508 "but was unable to open output file '%s': %s", 1509 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1510 } 1511 } else if (!Runtime::Current()->IsCompiler()) { 1512 // patchoat failed which means we probably don't have enough room to place the output oat file, 1513 // instead of failing we should just run the interpreter from the dex files in the input oat. 1514 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1515 << "for interpretation. patchoat failure was: " << *error_msg; 1516 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1517 } else { 1518 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1519 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1520 error_msg->c_str()); 1521 } 1522 return nullptr; 1523} 1524 1525int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1526 Runtime* runtime = Runtime::Current(); 1527 int32_t real_patch_delta; 1528 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1529 CHECK(image_space != nullptr); 1530 if (isa == Runtime::Current()->GetInstructionSet()) { 1531 const ImageHeader& image_header = image_space->GetImageHeader(); 1532 real_patch_delta = image_header.GetPatchDelta(); 1533 } else { 1534 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1535 image_space->GetImageLocation().c_str(), isa)); 1536 real_patch_delta = image_header->GetPatchDelta(); 1537 } 1538 const OatHeader& oat_header = oat_file->GetOatHeader(); 1539 return real_patch_delta - oat_header.GetImagePatchDelta(); 1540} 1541 1542bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1543 bool* checksum_verified, 1544 std::string* error_msg) { 1545 std::string compound_msg("Oat file failed to verify: "); 1546 Runtime* runtime = Runtime::Current(); 1547 uint32_t real_image_checksum; 1548 void* real_image_oat_offset; 1549 int32_t real_patch_delta; 1550 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1551 if (image_space == nullptr) { 1552 *error_msg = "No image space present"; 1553 return false; 1554 } 1555 if (isa == Runtime::Current()->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 1570 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1571 *checksum_verified = oat_image_checksum == real_image_checksum; 1572 if (!*checksum_verified) { 1573 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1574 real_image_checksum, oat_image_checksum); 1575 } 1576 1577 void* oat_image_oat_offset = 1578 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1579 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1580 if (!offset_verified) { 1581 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1582 real_image_oat_offset, oat_image_oat_offset); 1583 } 1584 1585 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1586 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1587 if (!patch_delta_verified) { 1588 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1589 real_patch_delta, oat_patch_delta); 1590 } 1591 1592 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1593 if (ret) { 1594 *error_msg = compound_msg; 1595 } 1596 return ret; 1597} 1598 1599const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1600 std::string* error_msg) { 1601 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1602 if (oat_file != nullptr) { 1603 return oat_file; 1604 } 1605 1606 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1607 error_msg); 1608 if (oat_file == NULL) { 1609 return NULL; 1610 } 1611 return oat_file; 1612} 1613 1614static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1615 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1616 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1617 1618 DCHECK(obj != NULL); 1619 DCHECK(class_linker != NULL); 1620 1621 if (obj->IsArtMethod()) { 1622 mirror::ArtMethod* method = obj->AsArtMethod(); 1623 if (!method->IsNative()) { 1624 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1625 if (method != Runtime::Current()->GetResolutionMethod()) { 1626 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1627 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1628 } 1629 } 1630 } 1631} 1632 1633void ClassLinker::InitFromImage() { 1634 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1635 CHECK(!init_done_); 1636 1637 Thread* self = Thread::Current(); 1638 gc::Heap* heap = Runtime::Current()->GetHeap(); 1639 gc::space::ImageSpace* space = heap->GetImageSpace(); 1640 dex_cache_image_class_lookup_required_ = true; 1641 CHECK(space != NULL); 1642 OatFile& oat_file = GetImageOatFile(space); 1643 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1644 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1645 const char* image_file_location = oat_file.GetOatHeader(). 1646 GetStoreValueByKey(OatHeader::kImageLocationKey); 1647 CHECK(image_file_location == nullptr || *image_file_location == 0); 1648 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1649 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1650 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1651 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1652 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1653 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1654 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1655 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1656 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1657 1658 StackHandleScope<1> hs(self); 1659 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1660 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1661 AsObjectArray<mirror::Class>())); 1662 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1663 1664 // Special case of setting up the String class early so that we can test arbitrary objects 1665 // as being Strings or not 1666 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1667 1668 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1669 static_cast<uint32_t>(dex_caches->GetLength())); 1670 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1671 StackHandleScope<1> hs(self); 1672 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1673 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1674 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1675 nullptr); 1676 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1677 std::string error_msg; 1678 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1679 if (dex_file == NULL) { 1680 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1681 << " from within oat file " << oat_file.GetLocation() 1682 << " error '" << error_msg << "'"; 1683 } 1684 1685 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1686 1687 AppendToBootClassPath(*dex_file, dex_cache); 1688 } 1689 1690 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1691 // bitmap walk. 1692 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1693 1694 // Set entry point to interpreter if in InterpretOnly mode. 1695 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1696 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1697 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1698 } 1699 1700 // reinit class_roots_ 1701 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1702 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1703 1704 // reinit array_iftable_ from any array class instance, they should be == 1705 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1706 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1707 // String class root was set above 1708 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1709 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1710 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1711 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1712 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1713 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1714 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1715 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1716 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1717 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1718 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1719 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1720 1721 FinishInit(self); 1722 1723 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1724} 1725 1726void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1727 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1728 if ((flags & kVisitRootFlagAllRoots) != 0) { 1729 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1730 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1731 } 1732 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1733 for (auto& pair : new_class_roots_) { 1734 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1735 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1736 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1737 if (UNLIKELY(new_ref != old_ref)) { 1738 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1739 // corresponding object. This is slow, but luckily for us, this may only happen with a 1740 // concurrent moving GC. 1741 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1742 it != end && it->first == pair.first; ++it) { 1743 // If the class stored matches the old class, update it to the new value. 1744 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1745 it->second = GcRoot<mirror::Class>(new_ref); 1746 } 1747 } 1748 } 1749 } 1750 } 1751 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1752 new_class_roots_.clear(); 1753 } 1754 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1755 log_new_class_table_roots_ = true; 1756 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1757 log_new_class_table_roots_ = false; 1758 } 1759 // We deliberately ignore the class roots in the image since we 1760 // handle image roots by using the MS/CMS rescanning of dirty cards. 1761} 1762 1763// Keep in sync with InitCallback. Anything we visit, we need to 1764// reinit references to when reinitializing a ClassLinker from a 1765// mapped image. 1766void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1767 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1768 Thread* self = Thread::Current(); 1769 { 1770 ReaderMutexLock mu(self, dex_lock_); 1771 if ((flags & kVisitRootFlagAllRoots) != 0) { 1772 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1773 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1774 } 1775 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1776 for (size_t index : new_dex_cache_roots_) { 1777 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1778 } 1779 } 1780 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1781 new_dex_cache_roots_.clear(); 1782 } 1783 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1784 log_new_dex_caches_roots_ = true; 1785 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1786 log_new_dex_caches_roots_ = false; 1787 } 1788 } 1789 VisitClassRoots(callback, arg, flags); 1790 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1791 DCHECK(!array_iftable_.IsNull()); 1792 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1793 if (!find_array_class_cache_[i].IsNull()) { 1794 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1795 } 1796 } 1797} 1798 1799void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1800 if (dex_cache_image_class_lookup_required_) { 1801 MoveImageClassesToClassTable(); 1802 } 1803 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1804 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1805 mirror::Class* c = it.second.Read(); 1806 if (!visitor(c, arg)) { 1807 return; 1808 } 1809 } 1810} 1811 1812static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1813 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1814 classes->insert(c); 1815 return true; 1816} 1817 1818void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1819 std::set<mirror::Class*> classes; 1820 VisitClasses(GetClassesVisitor, &classes); 1821 for (mirror::Class* klass : classes) { 1822 if (!visitor(klass, arg)) { 1823 return; 1824 } 1825 } 1826} 1827 1828ClassLinker::~ClassLinker() { 1829 mirror::Class::ResetClass(); 1830 mirror::String::ResetClass(); 1831 mirror::Reference::ResetClass(); 1832 mirror::ArtField::ResetClass(); 1833 mirror::ArtMethod::ResetClass(); 1834 mirror::BooleanArray::ResetArrayClass(); 1835 mirror::ByteArray::ResetArrayClass(); 1836 mirror::CharArray::ResetArrayClass(); 1837 mirror::DoubleArray::ResetArrayClass(); 1838 mirror::FloatArray::ResetArrayClass(); 1839 mirror::IntArray::ResetArrayClass(); 1840 mirror::LongArray::ResetArrayClass(); 1841 mirror::ShortArray::ResetArrayClass(); 1842 mirror::Throwable::ResetClass(); 1843 mirror::StackTraceElement::ResetClass(); 1844 STLDeleteElements(&boot_class_path_); 1845 STLDeleteElements(&oat_files_); 1846} 1847 1848mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1849 gc::Heap* heap = Runtime::Current()->GetHeap(); 1850 StackHandleScope<16> hs(self); 1851 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1852 Handle<mirror::DexCache> dex_cache( 1853 hs.NewHandle(down_cast<mirror::DexCache*>( 1854 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1855 VoidFunctor())))); 1856 if (dex_cache.Get() == NULL) { 1857 return NULL; 1858 } 1859 Handle<mirror::String> 1860 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1861 if (location.Get() == NULL) { 1862 return NULL; 1863 } 1864 Handle<mirror::ObjectArray<mirror::String>> 1865 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1866 if (strings.Get() == NULL) { 1867 return NULL; 1868 } 1869 Handle<mirror::ObjectArray<mirror::Class>> 1870 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1871 if (types.Get() == NULL) { 1872 return NULL; 1873 } 1874 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1875 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1876 if (methods.Get() == NULL) { 1877 return NULL; 1878 } 1879 Handle<mirror::ObjectArray<mirror::ArtField>> 1880 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1881 if (fields.Get() == NULL) { 1882 return NULL; 1883 } 1884 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1885 fields.Get()); 1886 return dex_cache.Get(); 1887} 1888 1889mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1890 uint32_t class_size) { 1891 DCHECK_GE(class_size, sizeof(mirror::Class)); 1892 gc::Heap* heap = Runtime::Current()->GetHeap(); 1893 mirror::Class::InitializeClassVisitor visitor(class_size); 1894 mirror::Object* k = kMovingClasses ? 1895 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1896 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1897 if (UNLIKELY(k == nullptr)) { 1898 CHECK(self->IsExceptionPending()); // OOME. 1899 return nullptr; 1900 } 1901 return k->AsClass(); 1902} 1903 1904mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1905 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1906} 1907 1908mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1909 return down_cast<mirror::ArtField*>( 1910 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1911} 1912 1913mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1914 return down_cast<mirror::ArtMethod*>( 1915 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1916} 1917 1918mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1919 Thread* self, size_t length) { 1920 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1921 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1922} 1923 1924mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1925 mirror::Class* klass) { 1926 DCHECK(klass != NULL); 1927 1928 // For temporary classes we must wait for them to be retired. 1929 if (init_done_ && klass->IsTemp()) { 1930 CHECK(!klass->IsResolved()); 1931 if (klass->IsErroneous()) { 1932 ThrowEarlierClassFailure(klass); 1933 return nullptr; 1934 } 1935 StackHandleScope<1> hs(self); 1936 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1937 ObjectLock<mirror::Class> lock(self, h_class); 1938 // Loop and wait for the resolving thread to retire this class. 1939 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1940 lock.WaitIgnoringInterrupts(); 1941 } 1942 if (h_class->IsErroneous()) { 1943 ThrowEarlierClassFailure(h_class.Get()); 1944 return nullptr; 1945 } 1946 CHECK(h_class->IsRetired()); 1947 // Get the updated class from class table. 1948 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1949 } 1950 1951 // Wait for the class if it has not already been linked. 1952 if (!klass->IsResolved() && !klass->IsErroneous()) { 1953 StackHandleScope<1> hs(self); 1954 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1955 ObjectLock<mirror::Class> lock(self, h_class); 1956 // Check for circular dependencies between classes. 1957 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1958 ThrowClassCircularityError(h_class.Get()); 1959 h_class->SetStatus(mirror::Class::kStatusError, self); 1960 return nullptr; 1961 } 1962 // Wait for the pending initialization to complete. 1963 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1964 lock.WaitIgnoringInterrupts(); 1965 } 1966 } 1967 1968 if (klass->IsErroneous()) { 1969 ThrowEarlierClassFailure(klass); 1970 return nullptr; 1971 } 1972 // Return the loaded class. No exceptions should be pending. 1973 CHECK(klass->IsResolved()) << PrettyClass(klass); 1974 self->AssertNoPendingException(); 1975 return klass; 1976} 1977 1978mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1979 ConstHandle<mirror::ClassLoader> class_loader) { 1980 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1981 DCHECK(self != nullptr); 1982 self->AssertNoPendingException(); 1983 if (descriptor[1] == '\0') { 1984 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1985 // for primitive classes that aren't backed by dex files. 1986 return FindPrimitiveClass(descriptor[0]); 1987 } 1988 // Find the class in the loaded classes table. 1989 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1990 if (klass != NULL) { 1991 return EnsureResolved(self, descriptor, klass); 1992 } 1993 // Class is not yet loaded. 1994 if (descriptor[0] == '[') { 1995 return CreateArrayClass(self, descriptor, class_loader); 1996 } else if (class_loader.Get() == nullptr) { 1997 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1998 if (pair.second != NULL) { 1999 StackHandleScope<1> hs(self); 2000 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2001 } 2002 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2003 // First try the boot class path, we check the descriptor first to avoid an unnecessary 2004 // throw of a NoClassDefFoundError. 2005 if (IsInBootClassPath(descriptor)) { 2006 mirror::Class* system_class = FindSystemClass(self, descriptor); 2007 CHECK(system_class != NULL); 2008 return system_class; 2009 } 2010 // Next try the compile time class path. 2011 const std::vector<const DexFile*>* class_path; 2012 { 2013 ScopedObjectAccessUnchecked soa(self); 2014 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2015 soa.AddLocalReference<jobject>(class_loader.Get())); 2016 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2017 } 2018 2019 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 2020 if (pair.second != NULL) { 2021 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2022 } 2023 2024 } else { 2025 ScopedObjectAccessUnchecked soa(self); 2026 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2027 soa.AddLocalReference<jobject>(class_loader.Get())); 2028 std::string class_name_string(DescriptorToDot(descriptor)); 2029 ScopedLocalRef<jobject> result(soa.Env(), NULL); 2030 { 2031 ScopedThreadStateChange tsc(self, kNative); 2032 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2033 soa.Env()->NewStringUTF(class_name_string.c_str())); 2034 if (class_name_object.get() == NULL) { 2035 return NULL; 2036 } 2037 CHECK(class_loader_object.get() != NULL); 2038 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2039 WellKnownClasses::java_lang_ClassLoader_loadClass, 2040 class_name_object.get())); 2041 } 2042 if (self->IsExceptionPending()) { 2043 // If the ClassLoader threw, pass that exception up. 2044 return NULL; 2045 } else if (result.get() == NULL) { 2046 // broken loader - throw NPE to be compatible with Dalvik 2047 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 2048 class_name_string.c_str()).c_str()); 2049 return NULL; 2050 } else { 2051 // success, return mirror::Class* 2052 return soa.Decode<mirror::Class*>(result.get()); 2053 } 2054 } 2055 2056 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2057 return NULL; 2058} 2059 2060mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2061 ConstHandle<mirror::ClassLoader> class_loader, 2062 const DexFile& dex_file, 2063 const DexFile::ClassDef& dex_class_def) { 2064 Thread* self = Thread::Current(); 2065 StackHandleScope<3> hs(self); 2066 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2067 bool should_allocate = false; 2068 2069 // Load the class from the dex file. 2070 if (UNLIKELY(!init_done_)) { 2071 // finish up init of hand crafted class_roots_ 2072 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2073 klass.Assign(GetClassRoot(kJavaLangObject)); 2074 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2075 klass.Assign(GetClassRoot(kJavaLangClass)); 2076 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2077 klass.Assign(GetClassRoot(kJavaLangString)); 2078 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2079 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2080 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2081 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2082 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2083 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2084 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2085 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2086 } else { 2087 should_allocate = true; 2088 } 2089 } else { 2090 should_allocate = true; 2091 } 2092 2093 if (should_allocate) { 2094 // Allocate a class with the status of not ready. 2095 // Interface object should get the right size here. Regular class will 2096 // figure out the right size later and be replaced with one of the right 2097 // size when the class becomes resolved. 2098 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2099 } 2100 if (UNLIKELY(klass.Get() == nullptr)) { 2101 CHECK(self->IsExceptionPending()); // Expect an OOME. 2102 return nullptr; 2103 } 2104 klass->SetDexCache(FindDexCache(dex_file)); 2105 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2106 ObjectLock<mirror::Class> lock(self, klass); 2107 if (self->IsExceptionPending()) { 2108 // An exception occured during load, set status to erroneous while holding klass' lock in case 2109 // notification is necessary. 2110 if (!klass->IsErroneous()) { 2111 klass->SetStatus(mirror::Class::kStatusError, self); 2112 } 2113 return nullptr; 2114 } 2115 klass->SetClinitThreadId(self->GetTid()); 2116 2117 // Add the newly loaded class to the loaded classes table. 2118 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2119 if (existing != nullptr) { 2120 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2121 // this thread to block. 2122 return EnsureResolved(self, descriptor, existing); 2123 } 2124 2125 // Finish loading (if necessary) by finding parents 2126 CHECK(!klass->IsLoaded()); 2127 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2128 // Loading failed. 2129 if (!klass->IsErroneous()) { 2130 klass->SetStatus(mirror::Class::kStatusError, self); 2131 } 2132 return nullptr; 2133 } 2134 CHECK(klass->IsLoaded()); 2135 // Link the class (if necessary) 2136 CHECK(!klass->IsResolved()); 2137 // TODO: Use fast jobjects? 2138 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2139 2140 mirror::Class* new_class = nullptr; 2141 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2142 // Linking failed. 2143 if (!klass->IsErroneous()) { 2144 klass->SetStatus(mirror::Class::kStatusError, self); 2145 } 2146 return nullptr; 2147 } 2148 CHECK(new_class != nullptr) << descriptor; 2149 CHECK(new_class->IsResolved()) << descriptor; 2150 2151 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2152 2153 /* 2154 * We send CLASS_PREPARE events to the debugger from here. The 2155 * definition of "preparation" is creating the static fields for a 2156 * class and initializing them to the standard default values, but not 2157 * executing any code (that comes later, during "initialization"). 2158 * 2159 * We did the static preparation in LinkClass. 2160 * 2161 * The class has been prepared and resolved but possibly not yet verified 2162 * at this point. 2163 */ 2164 Dbg::PostClassPrepare(new_class_h.Get()); 2165 2166 return new_class_h.Get(); 2167} 2168 2169uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2170 const DexFile::ClassDef& dex_class_def) { 2171 const byte* class_data = dex_file.GetClassData(dex_class_def); 2172 size_t num_ref = 0; 2173 size_t num_8 = 0; 2174 size_t num_16 = 0; 2175 size_t num_32 = 0; 2176 size_t num_64 = 0; 2177 if (class_data != NULL) { 2178 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2179 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2180 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2181 char c = descriptor[0]; 2182 switch (c) { 2183 case 'L': 2184 case '[': 2185 num_ref++; 2186 break; 2187 case 'J': 2188 case 'D': 2189 num_64++; 2190 break; 2191 case 'I': 2192 case 'F': 2193 num_32++; 2194 break; 2195 case 'S': 2196 case 'C': 2197 num_16++; 2198 break; 2199 case 'B': 2200 case 'Z': 2201 num_8++; 2202 break; 2203 default: 2204 LOG(FATAL) << "Unknown descriptor: " << c; 2205 } 2206 } 2207 } 2208 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2209} 2210 2211OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2212 bool* found) { 2213 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2214 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2215 if (oat_file == nullptr) { 2216 *found = false; 2217 return OatFile::OatClass::Invalid(); 2218 } 2219 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2220 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2221 &dex_location_checksum); 2222 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2223 *found = true; 2224 return oat_dex_file->GetOatClass(class_def_idx); 2225} 2226 2227static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2228 uint32_t method_idx) { 2229 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2230 const byte* class_data = dex_file.GetClassData(class_def); 2231 CHECK(class_data != NULL); 2232 ClassDataItemIterator it(dex_file, class_data); 2233 // Skip fields 2234 while (it.HasNextStaticField()) { 2235 it.Next(); 2236 } 2237 while (it.HasNextInstanceField()) { 2238 it.Next(); 2239 } 2240 // Process methods 2241 size_t class_def_method_index = 0; 2242 while (it.HasNextDirectMethod()) { 2243 if (it.GetMemberIndex() == method_idx) { 2244 return class_def_method_index; 2245 } 2246 class_def_method_index++; 2247 it.Next(); 2248 } 2249 while (it.HasNextVirtualMethod()) { 2250 if (it.GetMemberIndex() == method_idx) { 2251 return class_def_method_index; 2252 } 2253 class_def_method_index++; 2254 it.Next(); 2255 } 2256 DCHECK(!it.HasNext()); 2257 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2258 return 0; 2259} 2260 2261const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2262 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2263 // method for direct methods (or virtual methods made direct). 2264 mirror::Class* declaring_class = method->GetDeclaringClass(); 2265 size_t oat_method_index; 2266 if (method->IsStatic() || method->IsDirect()) { 2267 // Simple case where the oat method index was stashed at load time. 2268 oat_method_index = method->GetMethodIndex(); 2269 } else { 2270 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2271 // by search for its position in the declared virtual methods. 2272 oat_method_index = declaring_class->NumDirectMethods(); 2273 size_t end = declaring_class->NumVirtualMethods(); 2274 bool found = false; 2275 for (size_t i = 0; i < end; i++) { 2276 if (declaring_class->GetVirtualMethod(i) == method) { 2277 found = true; 2278 break; 2279 } 2280 oat_method_index++; 2281 } 2282 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2283 } 2284 DCHECK_EQ(oat_method_index, 2285 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2286 method->GetDeclaringClass()->GetDexClassDefIndex(), 2287 method->GetDexMethodIndex())); 2288 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2289 declaring_class->GetDexClassDefIndex(), 2290 found); 2291 if (!found) { 2292 return OatFile::OatMethod::Invalid(); 2293 } 2294 *found = true; 2295 return oat_class.GetOatMethod(oat_method_index); 2296} 2297 2298// Special case to get oat code without overwriting a trampoline. 2299const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2300 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2301 if (method->IsProxyMethod()) { 2302 return GetQuickProxyInvokeHandler(); 2303 } 2304 bool found; 2305 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2306 const void* result = nullptr; 2307 if (found) { 2308 result = oat_method.GetQuickCode(); 2309 } 2310 2311 if (result == nullptr) { 2312 if (method->IsNative()) { 2313 // No code and native? Use generic trampoline. 2314 result = GetQuickGenericJniTrampoline(); 2315 } else if (method->IsPortableCompiled()) { 2316 // No code? Do we expect portable code? 2317 result = GetQuickToPortableBridge(); 2318 } else { 2319 // No code? You must mean to go into the interpreter. 2320 result = GetQuickToInterpreterBridge(); 2321 } 2322 } 2323 return result; 2324} 2325 2326const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2327 bool* have_portable_code) { 2328 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2329 *have_portable_code = false; 2330 if (method->IsProxyMethod()) { 2331 return GetPortableProxyInvokeHandler(); 2332 } 2333 bool found; 2334 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2335 const void* result = nullptr; 2336 const void* quick_code = nullptr; 2337 if (found) { 2338 result = oat_method.GetPortableCode(); 2339 quick_code = oat_method.GetQuickCode(); 2340 } 2341 2342 if (result == nullptr) { 2343 if (quick_code == nullptr) { 2344 // No code? You must mean to go into the interpreter. 2345 result = GetPortableToInterpreterBridge(); 2346 } else { 2347 // No code? But there's quick code, so use a bridge. 2348 result = GetPortableToQuickBridge(); 2349 } 2350 } else { 2351 *have_portable_code = true; 2352 } 2353 return result; 2354} 2355 2356const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2357 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2358 return nullptr; 2359 } 2360 bool found; 2361 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2362 return found ? oat_method.GetQuickCode() : nullptr; 2363} 2364 2365const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2366 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2367 return nullptr; 2368 } 2369 bool found; 2370 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2371 return found ? oat_method.GetPortableCode() : nullptr; 2372} 2373 2374const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2375 uint32_t method_idx) { 2376 bool found; 2377 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2378 if (!found) { 2379 return nullptr; 2380 } 2381 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2382 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2383} 2384 2385const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2386 uint32_t method_idx) { 2387 bool found; 2388 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2389 if (!found) { 2390 return nullptr; 2391 } 2392 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2393 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2394} 2395 2396// Returns true if the method must run with interpreter, false otherwise. 2397static bool NeedsInterpreter( 2398 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2399 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2400 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2401 // No code: need interpreter. 2402 // May return true for native code, in the case of generic JNI 2403 // DCHECK(!method->IsNative()); 2404 return true; 2405 } 2406#ifdef ART_SEA_IR_MODE 2407 ScopedObjectAccess soa(Thread::Current()); 2408 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2409 LOG(INFO) << "Found " << PrettyMethod(method); 2410 return false; 2411 } 2412#endif 2413 // If interpreter mode is enabled, every method (except native and proxy) must 2414 // be run with interpreter. 2415 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2416 !method->IsNative() && !method->IsProxyMethod(); 2417} 2418 2419void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2420 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2421 if (klass->NumDirectMethods() == 0) { 2422 return; // No direct methods => no static methods. 2423 } 2424 Runtime* runtime = Runtime::Current(); 2425 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2426 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2427 return; // OAT file unavailable. 2428 } 2429 } 2430 2431 const DexFile& dex_file = klass->GetDexFile(); 2432 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2433 CHECK(dex_class_def != nullptr); 2434 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2435 // There should always be class data if there were direct methods. 2436 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2437 ClassDataItemIterator it(dex_file, class_data); 2438 // Skip fields 2439 while (it.HasNextStaticField()) { 2440 it.Next(); 2441 } 2442 while (it.HasNextInstanceField()) { 2443 it.Next(); 2444 } 2445 bool has_oat_class; 2446 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2447 &has_oat_class); 2448 // Link the code of methods skipped by LinkCode. 2449 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2450 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2451 if (!method->IsStatic()) { 2452 // Only update static methods. 2453 continue; 2454 } 2455 const void* portable_code = nullptr; 2456 const void* quick_code = nullptr; 2457 if (has_oat_class) { 2458 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2459 portable_code = oat_method.GetPortableCode(); 2460 quick_code = oat_method.GetQuickCode(); 2461 } 2462 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2463 bool have_portable_code = false; 2464 if (enter_interpreter) { 2465 // Use interpreter entry point. 2466 // Check whether the method is native, in which case it's generic JNI. 2467 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2468 quick_code = GetQuickGenericJniTrampoline(); 2469 portable_code = GetPortableToQuickBridge(); 2470 } else { 2471 portable_code = GetPortableToInterpreterBridge(); 2472 quick_code = GetQuickToInterpreterBridge(); 2473 } 2474 } else { 2475 if (portable_code == nullptr) { 2476 portable_code = GetPortableToQuickBridge(); 2477 } else { 2478 have_portable_code = true; 2479 } 2480 if (quick_code == nullptr) { 2481 quick_code = GetQuickToPortableBridge(); 2482 } 2483 } 2484 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2485 have_portable_code); 2486 } 2487 // Ignore virtual methods on the iterator. 2488} 2489 2490void ClassLinker::LinkCode(ConstHandle<mirror::ArtMethod> method, 2491 const OatFile::OatClass* oat_class, 2492 const DexFile& dex_file, uint32_t dex_method_index, 2493 uint32_t method_index) { 2494 if (Runtime::Current()->IsCompiler()) { 2495 // The following code only applies to a non-compiler runtime. 2496 return; 2497 } 2498 // Method shouldn't have already been linked. 2499 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2500 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2501 if (oat_class != nullptr) { 2502 // Every kind of method should at least get an invoke stub from the oat_method. 2503 // non-abstract methods also get their code pointers. 2504 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2505 oat_method.LinkMethod(method.Get()); 2506 } 2507 2508 // Install entry point from interpreter. 2509 bool enter_interpreter = NeedsInterpreter(method.Get(), 2510 method->GetEntryPointFromQuickCompiledCode(), 2511 method->GetEntryPointFromPortableCompiledCode()); 2512 if (enter_interpreter && !method->IsNative()) { 2513 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2514 } else { 2515 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2516 } 2517 2518 if (method->IsAbstract()) { 2519 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2520 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2521 return; 2522 } 2523 2524 bool have_portable_code = false; 2525 if (method->IsStatic() && !method->IsConstructor()) { 2526 // For static methods excluding the class initializer, install the trampoline. 2527 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2528 // after initializing class (see ClassLinker::InitializeClass method). 2529 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2530 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2531 } else if (enter_interpreter) { 2532 if (!method->IsNative()) { 2533 // Set entry point from compiled code if there's no code or in interpreter only mode. 2534 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2535 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2536 } else { 2537 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2538 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2539 } 2540 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2541 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2542 have_portable_code = true; 2543 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2544 } else { 2545 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2546 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2547 } 2548 2549 if (method->IsNative()) { 2550 // Unregistering restores the dlsym lookup stub. 2551 method->UnregisterNative(Thread::Current()); 2552 2553 if (enter_interpreter) { 2554 // We have a native method here without code. Then it should have either the GenericJni 2555 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2556 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2557 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2558 } 2559 } 2560 2561 // Allow instrumentation its chance to hijack code. 2562 Runtime* runtime = Runtime::Current(); 2563 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2564 method->GetEntryPointFromQuickCompiledCode(), 2565 method->GetEntryPointFromPortableCompiledCode(), 2566 have_portable_code); 2567} 2568 2569 2570 2571void ClassLinker::LoadClass(const DexFile& dex_file, 2572 const DexFile::ClassDef& dex_class_def, 2573 ConstHandle<mirror::Class> klass, 2574 mirror::ClassLoader* class_loader) { 2575 CHECK(klass.Get() != NULL); 2576 CHECK(klass->GetDexCache() != NULL); 2577 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2578 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2579 CHECK(descriptor != NULL); 2580 2581 klass->SetClass(GetClassRoot(kJavaLangClass)); 2582 if (kUseBakerOrBrooksReadBarrier) { 2583 klass->AssertReadBarrierPointer(); 2584 } 2585 uint32_t access_flags = dex_class_def.access_flags_; 2586 // Make sure that none of our runtime-only flags are set. 2587 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2588 klass->SetAccessFlags(access_flags); 2589 klass->SetClassLoader(class_loader); 2590 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2591 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2592 2593 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2594 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2595 2596 const byte* class_data = dex_file.GetClassData(dex_class_def); 2597 if (class_data == NULL) { 2598 return; // no fields or methods - for example a marker interface 2599 } 2600 2601 2602 bool has_oat_class = false; 2603 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2604 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2605 &has_oat_class); 2606 if (has_oat_class) { 2607 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2608 } 2609 } 2610 if (!has_oat_class) { 2611 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2612 } 2613} 2614 2615void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2616 const byte* class_data, 2617 ConstHandle<mirror::Class> klass, 2618 mirror::ClassLoader* class_loader, 2619 const OatFile::OatClass* oat_class) { 2620 // Load fields. 2621 ClassDataItemIterator it(dex_file, class_data); 2622 Thread* self = Thread::Current(); 2623 if (it.NumStaticFields() != 0) { 2624 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2625 if (UNLIKELY(statics == NULL)) { 2626 CHECK(self->IsExceptionPending()); // OOME. 2627 return; 2628 } 2629 klass->SetSFields(statics); 2630 } 2631 if (it.NumInstanceFields() != 0) { 2632 mirror::ObjectArray<mirror::ArtField>* fields = 2633 AllocArtFieldArray(self, it.NumInstanceFields()); 2634 if (UNLIKELY(fields == NULL)) { 2635 CHECK(self->IsExceptionPending()); // OOME. 2636 return; 2637 } 2638 klass->SetIFields(fields); 2639 } 2640 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2641 StackHandleScope<1> hs(self); 2642 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2643 if (UNLIKELY(sfield.Get() == NULL)) { 2644 CHECK(self->IsExceptionPending()); // OOME. 2645 return; 2646 } 2647 klass->SetStaticField(i, sfield.Get()); 2648 LoadField(dex_file, it, klass, sfield); 2649 } 2650 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2651 StackHandleScope<1> hs(self); 2652 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2653 if (UNLIKELY(ifield.Get() == NULL)) { 2654 CHECK(self->IsExceptionPending()); // OOME. 2655 return; 2656 } 2657 klass->SetInstanceField(i, ifield.Get()); 2658 LoadField(dex_file, it, klass, ifield); 2659 } 2660 2661 // Load methods. 2662 if (it.NumDirectMethods() != 0) { 2663 // TODO: append direct methods to class object 2664 mirror::ObjectArray<mirror::ArtMethod>* directs = 2665 AllocArtMethodArray(self, it.NumDirectMethods()); 2666 if (UNLIKELY(directs == NULL)) { 2667 CHECK(self->IsExceptionPending()); // OOME. 2668 return; 2669 } 2670 klass->SetDirectMethods(directs); 2671 } 2672 if (it.NumVirtualMethods() != 0) { 2673 // TODO: append direct methods to class object 2674 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2675 AllocArtMethodArray(self, it.NumVirtualMethods()); 2676 if (UNLIKELY(virtuals == NULL)) { 2677 CHECK(self->IsExceptionPending()); // OOME. 2678 return; 2679 } 2680 klass->SetVirtualMethods(virtuals); 2681 } 2682 size_t class_def_method_index = 0; 2683 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2684 StackHandleScope<1> hs(self); 2685 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2686 if (UNLIKELY(method.Get() == NULL)) { 2687 CHECK(self->IsExceptionPending()); // OOME. 2688 return; 2689 } 2690 klass->SetDirectMethod(i, method.Get()); 2691 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2692 method->SetMethodIndex(class_def_method_index); 2693 class_def_method_index++; 2694 } 2695 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2696 StackHandleScope<1> hs(self); 2697 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2698 if (UNLIKELY(method.Get() == NULL)) { 2699 CHECK(self->IsExceptionPending()); // OOME. 2700 return; 2701 } 2702 klass->SetVirtualMethod(i, method.Get()); 2703 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2704 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2705 class_def_method_index++; 2706 } 2707 DCHECK(!it.HasNext()); 2708} 2709 2710void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2711 ConstHandle<mirror::Class> klass, 2712 ConstHandle<mirror::ArtField> dst) { 2713 uint32_t field_idx = it.GetMemberIndex(); 2714 dst->SetDexFieldIndex(field_idx); 2715 dst->SetDeclaringClass(klass.Get()); 2716 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2717} 2718 2719mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2720 const ClassDataItemIterator& it, 2721 ConstHandle<mirror::Class> klass) { 2722 uint32_t dex_method_idx = it.GetMemberIndex(); 2723 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2724 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2725 2726 mirror::ArtMethod* dst = AllocArtMethod(self); 2727 if (UNLIKELY(dst == NULL)) { 2728 CHECK(self->IsExceptionPending()); // OOME. 2729 return NULL; 2730 } 2731 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2732 2733 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2734 dst->SetDexMethodIndex(dex_method_idx); 2735 dst->SetDeclaringClass(klass.Get()); 2736 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2737 2738 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2739 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2740 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2741 2742 uint32_t access_flags = it.GetMemberAccessFlags(); 2743 2744 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2745 // Set finalizable flag on declaring class. 2746 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2747 // Void return type. 2748 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2749 klass->SetFinalizable(); 2750 } else { 2751 std::string temp; 2752 const char* klass_descriptor = klass->GetDescriptor(&temp); 2753 // The Enum class declares a "final" finalize() method to prevent subclasses from 2754 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2755 // subclasses, so we exclude it here. 2756 // We also want to avoid setting the flag on Object, where we know that finalize() is 2757 // empty. 2758 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2759 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2760 klass->SetFinalizable(); 2761 } 2762 } 2763 } 2764 } else if (method_name[0] == '<') { 2765 // Fix broken access flags for initializers. Bug 11157540. 2766 bool is_init = (strcmp("<init>", method_name) == 0); 2767 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2768 if (UNLIKELY(!is_init && !is_clinit)) { 2769 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2770 } else { 2771 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2772 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2773 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2774 access_flags |= kAccConstructor; 2775 } 2776 } 2777 } 2778 dst->SetAccessFlags(access_flags); 2779 2780 self->EndAssertNoThreadSuspension(old_cause); 2781 return dst; 2782} 2783 2784void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2785 Thread* self = Thread::Current(); 2786 StackHandleScope<1> hs(self); 2787 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2788 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2789 AppendToBootClassPath(dex_file, dex_cache); 2790} 2791 2792void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2793 ConstHandle<mirror::DexCache> dex_cache) { 2794 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2795 boot_class_path_.push_back(&dex_file); 2796 RegisterDexFile(dex_file, dex_cache); 2797} 2798 2799bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2800 dex_lock_.AssertSharedHeld(Thread::Current()); 2801 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2802 mirror::DexCache* dex_cache = GetDexCache(i); 2803 if (dex_cache->GetDexFile() == &dex_file) { 2804 return true; 2805 } 2806 } 2807 return false; 2808} 2809 2810bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2811 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2812 return IsDexFileRegisteredLocked(dex_file); 2813} 2814 2815void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2816 ConstHandle<mirror::DexCache> dex_cache) { 2817 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2818 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2819 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2820 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2821 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2822 dex_cache->SetDexFile(&dex_file); 2823 if (log_new_dex_caches_roots_) { 2824 // TODO: This is not safe if we can remove dex caches. 2825 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2826 } 2827} 2828 2829void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2830 Thread* self = Thread::Current(); 2831 { 2832 ReaderMutexLock mu(self, dex_lock_); 2833 if (IsDexFileRegisteredLocked(dex_file)) { 2834 return; 2835 } 2836 } 2837 // Don't alloc while holding the lock, since allocation may need to 2838 // suspend all threads and another thread may need the dex_lock_ to 2839 // get to a suspend point. 2840 StackHandleScope<1> hs(self); 2841 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2842 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2843 { 2844 WriterMutexLock mu(self, dex_lock_); 2845 if (IsDexFileRegisteredLocked(dex_file)) { 2846 return; 2847 } 2848 RegisterDexFileLocked(dex_file, dex_cache); 2849 } 2850} 2851 2852void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2853 ConstHandle<mirror::DexCache> dex_cache) { 2854 WriterMutexLock mu(Thread::Current(), dex_lock_); 2855 RegisterDexFileLocked(dex_file, dex_cache); 2856} 2857 2858mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2859 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2860 // Search assuming unique-ness of dex file. 2861 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2862 mirror::DexCache* dex_cache = GetDexCache(i); 2863 if (dex_cache->GetDexFile() == &dex_file) { 2864 return dex_cache; 2865 } 2866 } 2867 // Search matching by location name. 2868 std::string location(dex_file.GetLocation()); 2869 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2870 mirror::DexCache* dex_cache = GetDexCache(i); 2871 if (dex_cache->GetDexFile()->GetLocation() == location) { 2872 return dex_cache; 2873 } 2874 } 2875 // Failure, dump diagnostic and abort. 2876 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2877 mirror::DexCache* dex_cache = GetDexCache(i); 2878 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2879 } 2880 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2881 return NULL; 2882} 2883 2884void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2885 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2886 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2887 mirror::DexCache* dex_cache = GetDexCache(i); 2888 dex_cache->Fixup(resolution_method); 2889 } 2890} 2891 2892mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2893 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2894 if (UNLIKELY(klass == NULL)) { 2895 return NULL; 2896 } 2897 return InitializePrimitiveClass(klass, type); 2898} 2899 2900mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2901 Primitive::Type type) { 2902 CHECK(primitive_class != NULL); 2903 // Must hold lock on object when initializing. 2904 Thread* self = Thread::Current(); 2905 StackHandleScope<1> hs(self); 2906 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2907 ObjectLock<mirror::Class> lock(self, h_class); 2908 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2909 primitive_class->SetPrimitiveType(type); 2910 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2911 const char* descriptor = Primitive::Descriptor(type); 2912 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2913 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2914 return primitive_class; 2915} 2916 2917// Create an array class (i.e. the class object for the array, not the 2918// array itself). "descriptor" looks like "[C" or "[[[[B" or 2919// "[Ljava/lang/String;". 2920// 2921// If "descriptor" refers to an array of primitives, look up the 2922// primitive type's internally-generated class object. 2923// 2924// "class_loader" is the class loader of the class that's referring to 2925// us. It's used to ensure that we're looking for the element type in 2926// the right context. It does NOT become the class loader for the 2927// array class; that always comes from the base element class. 2928// 2929// Returns NULL with an exception raised on failure. 2930mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2931 ConstHandle<mirror::ClassLoader> class_loader) { 2932 // Identify the underlying component type 2933 CHECK_EQ('[', descriptor[0]); 2934 StackHandleScope<2> hs(self); 2935 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2936 if (component_type.Get() == nullptr) { 2937 DCHECK(self->IsExceptionPending()); 2938 // We need to accept erroneous classes as component types. 2939 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2940 if (component_type.Get() == nullptr) { 2941 DCHECK(self->IsExceptionPending()); 2942 return nullptr; 2943 } else { 2944 self->ClearException(); 2945 } 2946 } 2947 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2948 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2949 return nullptr; 2950 } 2951 // See if the component type is already loaded. Array classes are 2952 // always associated with the class loader of their underlying 2953 // element type -- an array of Strings goes with the loader for 2954 // java/lang/String -- so we need to look for it there. (The 2955 // caller should have checked for the existence of the class 2956 // before calling here, but they did so with *their* class loader, 2957 // not the component type's loader.) 2958 // 2959 // If we find it, the caller adds "loader" to the class' initiating 2960 // loader list, which should prevent us from going through this again. 2961 // 2962 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2963 // are the same, because our caller (FindClass) just did the 2964 // lookup. (Even if we get this wrong we still have correct behavior, 2965 // because we effectively do this lookup again when we add the new 2966 // class to the hash table --- necessary because of possible races with 2967 // other threads.) 2968 if (class_loader.Get() != component_type->GetClassLoader()) { 2969 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2970 if (new_class != NULL) { 2971 return new_class; 2972 } 2973 } 2974 2975 // Fill out the fields in the Class. 2976 // 2977 // It is possible to execute some methods against arrays, because 2978 // all arrays are subclasses of java_lang_Object_, so we need to set 2979 // up a vtable. We can just point at the one in java_lang_Object_. 2980 // 2981 // Array classes are simple enough that we don't need to do a full 2982 // link step. 2983 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2984 if (UNLIKELY(!init_done_)) { 2985 // Classes that were hand created, ie not by FindSystemClass 2986 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2987 new_class.Assign(GetClassRoot(kClassArrayClass)); 2988 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2989 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2990 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2991 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2992 } else if (strcmp(descriptor, 2993 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2994 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2995 } else if (strcmp(descriptor, 2996 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2997 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2998 } else if (strcmp(descriptor, "[C") == 0) { 2999 new_class.Assign(GetClassRoot(kCharArrayClass)); 3000 } else if (strcmp(descriptor, "[I") == 0) { 3001 new_class.Assign(GetClassRoot(kIntArrayClass)); 3002 } 3003 } 3004 if (new_class.Get() == nullptr) { 3005 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3006 if (new_class.Get() == nullptr) { 3007 return nullptr; 3008 } 3009 new_class->SetComponentType(component_type.Get()); 3010 } 3011 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3012 DCHECK(new_class->GetComponentType() != NULL); 3013 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3014 new_class->SetSuperClass(java_lang_Object); 3015 new_class->SetVTable(java_lang_Object->GetVTable()); 3016 new_class->SetPrimitiveType(Primitive::kPrimNot); 3017 new_class->SetClassLoader(component_type->GetClassLoader()); 3018 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3019 new_class->PopulateEmbeddedImtAndVTable(); 3020 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3021 // don't need to set new_class->SetObjectSize(..) 3022 // because Object::SizeOf delegates to Array::SizeOf 3023 3024 3025 // All arrays have java/lang/Cloneable and java/io/Serializable as 3026 // interfaces. We need to set that up here, so that stuff like 3027 // "instanceof" works right. 3028 // 3029 // Note: The GC could run during the call to FindSystemClass, 3030 // so we need to make sure the class object is GC-valid while we're in 3031 // there. Do this by clearing the interface list so the GC will just 3032 // think that the entries are null. 3033 3034 3035 // Use the single, global copies of "interfaces" and "iftable" 3036 // (remember not to free them for arrays). 3037 { 3038 mirror::IfTable* array_iftable = array_iftable_.Read(); 3039 CHECK(array_iftable != nullptr); 3040 new_class->SetIfTable(array_iftable); 3041 } 3042 3043 // Inherit access flags from the component type. 3044 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3045 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3046 access_flags &= kAccJavaFlagsMask; 3047 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3048 // and remove "interface". 3049 access_flags |= kAccAbstract | kAccFinal; 3050 access_flags &= ~kAccInterface; 3051 3052 new_class->SetAccessFlags(access_flags); 3053 3054 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3055 if (existing == nullptr) { 3056 return new_class.Get(); 3057 } 3058 // Another thread must have loaded the class after we 3059 // started but before we finished. Abandon what we've 3060 // done. 3061 // 3062 // (Yes, this happens.) 3063 3064 return existing; 3065} 3066 3067mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3068 switch (type) { 3069 case 'B': 3070 return GetClassRoot(kPrimitiveByte); 3071 case 'C': 3072 return GetClassRoot(kPrimitiveChar); 3073 case 'D': 3074 return GetClassRoot(kPrimitiveDouble); 3075 case 'F': 3076 return GetClassRoot(kPrimitiveFloat); 3077 case 'I': 3078 return GetClassRoot(kPrimitiveInt); 3079 case 'J': 3080 return GetClassRoot(kPrimitiveLong); 3081 case 'S': 3082 return GetClassRoot(kPrimitiveShort); 3083 case 'Z': 3084 return GetClassRoot(kPrimitiveBoolean); 3085 case 'V': 3086 return GetClassRoot(kPrimitiveVoid); 3087 default: 3088 break; 3089 } 3090 std::string printable_type(PrintableChar(type)); 3091 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3092 return NULL; 3093} 3094 3095mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3096 size_t hash) { 3097 if (VLOG_IS_ON(class_linker)) { 3098 mirror::DexCache* dex_cache = klass->GetDexCache(); 3099 std::string source; 3100 if (dex_cache != NULL) { 3101 source += " from "; 3102 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3103 } 3104 LOG(INFO) << "Loaded class " << descriptor << source; 3105 } 3106 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3107 mirror::Class* existing = 3108 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3109 if (existing != NULL) { 3110 return existing; 3111 } 3112 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3113 dex_cache_image_class_lookup_required_) { 3114 // Check a class loaded with the system class loader matches one in the image if the class 3115 // is in the image. 3116 existing = LookupClassFromImage(descriptor); 3117 if (existing != NULL) { 3118 CHECK(klass == existing); 3119 } 3120 } 3121 VerifyObject(klass); 3122 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3123 if (log_new_class_table_roots_) { 3124 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3125 } 3126 return NULL; 3127} 3128 3129mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3130 size_t hash) { 3131 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3132 mirror::Class* existing = 3133 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3134 3135 if (existing == nullptr) { 3136 CHECK(klass->IsProxyClass()); 3137 return nullptr; 3138 } 3139 3140 CHECK_NE(existing, klass) << descriptor; 3141 CHECK(!existing->IsResolved()) << descriptor; 3142 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3143 3144 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3145 ++it) { 3146 mirror::Class* klass = it->second.Read(); 3147 if (klass == existing) { 3148 class_table_.erase(it); 3149 break; 3150 } 3151 } 3152 3153 CHECK(!klass->IsTemp()) << descriptor; 3154 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3155 dex_cache_image_class_lookup_required_) { 3156 // Check a class loaded with the system class loader matches one in the image if the class 3157 // is in the image. 3158 existing = LookupClassFromImage(descriptor); 3159 if (existing != nullptr) { 3160 CHECK(klass == existing) << descriptor; 3161 } 3162 } 3163 VerifyObject(klass); 3164 3165 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3166 if (log_new_class_table_roots_) { 3167 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3168 } 3169 3170 return existing; 3171} 3172 3173bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3174 size_t hash = Hash(descriptor); 3175 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3176 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3177 it != end && it->first == hash; 3178 ++it) { 3179 mirror::Class* klass = it->second.Read(); 3180 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3181 class_table_.erase(it); 3182 return true; 3183 } 3184 } 3185 return false; 3186} 3187 3188mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3189 const mirror::ClassLoader* class_loader) { 3190 size_t hash = Hash(descriptor); 3191 { 3192 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3193 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3194 if (result != NULL) { 3195 return result; 3196 } 3197 } 3198 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3199 return NULL; 3200 } else { 3201 // Lookup failed but need to search dex_caches_. 3202 mirror::Class* result = LookupClassFromImage(descriptor); 3203 if (result != NULL) { 3204 InsertClass(descriptor, result, hash); 3205 } else { 3206 // Searching the image dex files/caches failed, we don't want to get into this situation 3207 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3208 // classes into the class table. 3209 const int32_t kMaxFailedDexCacheLookups = 1000; 3210 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3211 MoveImageClassesToClassTable(); 3212 } 3213 } 3214 return result; 3215 } 3216} 3217 3218mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3219 const mirror::ClassLoader* class_loader, 3220 size_t hash) { 3221 auto end = class_table_.end(); 3222 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3223 mirror::Class* klass = it->second.Read(); 3224 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3225 if (kIsDebugBuild) { 3226 // Check for duplicates in the table. 3227 for (++it; it != end && it->first == hash; ++it) { 3228 mirror::Class* klass2 = it->second.Read(); 3229 CHECK(!(klass2->GetClassLoader() == class_loader && 3230 klass2->DescriptorEquals(descriptor))) 3231 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3232 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3233 } 3234 } 3235 return klass; 3236 } 3237 } 3238 return NULL; 3239} 3240 3241static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3242 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3243 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3244 CHECK(image != NULL); 3245 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3246 return root->AsObjectArray<mirror::DexCache>(); 3247} 3248 3249void ClassLinker::MoveImageClassesToClassTable() { 3250 Thread* self = Thread::Current(); 3251 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3252 if (!dex_cache_image_class_lookup_required_) { 3253 return; // All dex cache classes are already in the class table. 3254 } 3255 const char* old_no_suspend_cause = 3256 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3257 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3258 std::string temp; 3259 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3260 mirror::DexCache* dex_cache = dex_caches->Get(i); 3261 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3262 for (int32_t j = 0; j < types->GetLength(); j++) { 3263 mirror::Class* klass = types->Get(j); 3264 if (klass != NULL) { 3265 DCHECK(klass->GetClassLoader() == NULL); 3266 const char* descriptor = klass->GetDescriptor(&temp); 3267 size_t hash = Hash(descriptor); 3268 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3269 if (existing != NULL) { 3270 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3271 << PrettyClassAndClassLoader(klass); 3272 } else { 3273 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3274 if (log_new_class_table_roots_) { 3275 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3276 } 3277 } 3278 } 3279 } 3280 } 3281 dex_cache_image_class_lookup_required_ = false; 3282 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3283} 3284 3285mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3286 Thread* self = Thread::Current(); 3287 const char* old_no_suspend_cause = 3288 self->StartAssertNoThreadSuspension("Image class lookup"); 3289 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3290 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3291 mirror::DexCache* dex_cache = dex_caches->Get(i); 3292 const DexFile* dex_file = dex_cache->GetDexFile(); 3293 // Try binary searching the string/type index. 3294 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3295 if (string_id != NULL) { 3296 const DexFile::TypeId* type_id = 3297 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3298 if (type_id != NULL) { 3299 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3300 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3301 if (klass != NULL) { 3302 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3303 return klass; 3304 } 3305 } 3306 } 3307 } 3308 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3309 return NULL; 3310} 3311 3312void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3313 result.clear(); 3314 if (dex_cache_image_class_lookup_required_) { 3315 MoveImageClassesToClassTable(); 3316 } 3317 size_t hash = Hash(descriptor); 3318 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3319 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3320 it != end && it->first == hash; ++it) { 3321 mirror::Class* klass = it->second.Read(); 3322 if (klass->DescriptorEquals(descriptor)) { 3323 result.push_back(klass); 3324 } 3325 } 3326} 3327 3328void ClassLinker::VerifyClass(ConstHandle<mirror::Class> klass) { 3329 // TODO: assert that the monitor on the Class is held 3330 Thread* self = Thread::Current(); 3331 ObjectLock<mirror::Class> lock(self, klass); 3332 3333 // Don't attempt to re-verify if already sufficiently verified. 3334 if (klass->IsVerified() || 3335 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3336 return; 3337 } 3338 3339 // The class might already be erroneous, for example at compile time if we attempted to verify 3340 // this class as a parent to another. 3341 if (klass->IsErroneous()) { 3342 ThrowEarlierClassFailure(klass.Get()); 3343 return; 3344 } 3345 3346 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3347 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3348 } else { 3349 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3350 << PrettyClass(klass.Get()); 3351 CHECK(!Runtime::Current()->IsCompiler()); 3352 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3353 } 3354 3355 // Skip verification if disabled. 3356 if (!Runtime::Current()->IsVerificationEnabled()) { 3357 klass->SetStatus(mirror::Class::kStatusVerified, self); 3358 return; 3359 } 3360 3361 // Verify super class. 3362 StackHandleScope<2> hs(self); 3363 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3364 if (super.Get() != NULL) { 3365 // Acquire lock to prevent races on verifying the super class. 3366 ObjectLock<mirror::Class> lock(self, super); 3367 3368 if (!super->IsVerified() && !super->IsErroneous()) { 3369 VerifyClass(super); 3370 } 3371 if (!super->IsCompileTimeVerified()) { 3372 std::string error_msg( 3373 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3374 PrettyDescriptor(klass.Get()).c_str(), 3375 PrettyDescriptor(super.Get()).c_str())); 3376 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3377 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3378 if (cause.Get() != nullptr) { 3379 self->ClearException(); 3380 } 3381 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3382 if (cause.Get() != nullptr) { 3383 self->GetException(nullptr)->SetCause(cause.Get()); 3384 } 3385 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3386 if (Runtime::Current()->IsCompiler()) { 3387 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3388 } 3389 klass->SetStatus(mirror::Class::kStatusError, self); 3390 return; 3391 } 3392 } 3393 3394 // Try to use verification information from the oat file, otherwise do runtime verification. 3395 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3396 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3397 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3398 if (oat_file_class_status == mirror::Class::kStatusError) { 3399 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3400 << PrettyDescriptor(klass.Get()) << " in " 3401 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3402 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3403 PrettyDescriptor(klass.Get()).c_str()); 3404 klass->SetStatus(mirror::Class::kStatusError, self); 3405 return; 3406 } 3407 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3408 std::string error_msg; 3409 if (!preverified) { 3410 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3411 Runtime::Current()->IsCompiler(), 3412 &error_msg); 3413 } 3414 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3415 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3416 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3417 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3418 << " because: " << error_msg; 3419 } 3420 self->AssertNoPendingException(); 3421 // Make sure all classes referenced by catch blocks are resolved. 3422 ResolveClassExceptionHandlerTypes(dex_file, klass); 3423 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3424 // Even though there were no verifier failures we need to respect whether the super-class 3425 // was verified or requiring runtime reverification. 3426 if (super.Get() == NULL || super->IsVerified()) { 3427 klass->SetStatus(mirror::Class::kStatusVerified, self); 3428 } else { 3429 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3430 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3431 // Pretend a soft failure occured so that we don't consider the class verified below. 3432 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3433 } 3434 } else { 3435 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3436 // Soft failures at compile time should be retried at runtime. Soft 3437 // failures at runtime will be handled by slow paths in the generated 3438 // code. Set status accordingly. 3439 if (Runtime::Current()->IsCompiler()) { 3440 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3441 } else { 3442 klass->SetStatus(mirror::Class::kStatusVerified, self); 3443 } 3444 } 3445 } else { 3446 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3447 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3448 << " because: " << error_msg; 3449 self->AssertNoPendingException(); 3450 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3451 klass->SetStatus(mirror::Class::kStatusError, self); 3452 } 3453 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3454 // Class is verified so we don't need to do any access check on its methods. 3455 // Let the interpreter know it by setting the kAccPreverified flag onto each 3456 // method. 3457 // Note: we're going here during compilation and at runtime. When we set the 3458 // kAccPreverified flag when compiling image classes, the flag is recorded 3459 // in the image and is set when loading the image. 3460 klass->SetPreverifiedFlagOnAllMethods(); 3461 } 3462} 3463 3464bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3465 mirror::Class::Status& oat_file_class_status) { 3466 // If we're compiling, we can only verify the class using the oat file if 3467 // we are not compiling the image or if the class we're verifying is not part of 3468 // the app. In other words, we will only check for preverification of bootclasspath 3469 // classes. 3470 if (Runtime::Current()->IsCompiler()) { 3471 // Are we compiling the bootclasspath? 3472 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3473 return false; 3474 } 3475 // We are compiling an app (not the image). 3476 3477 // Is this an app class? (I.e. not a bootclasspath class) 3478 if (klass->GetClassLoader() != NULL) { 3479 return false; 3480 } 3481 } 3482 3483 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3484 // Make this work with gtests, which do not set up the image properly. 3485 // TODO: we should clean up gtests to set up the image path properly. 3486 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3487 return false; 3488 } 3489 3490 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3491 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3492 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3493 &dex_location_checksum); 3494 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3495 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3496 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3497 if (oat_file_class_status == mirror::Class::kStatusVerified || 3498 oat_file_class_status == mirror::Class::kStatusInitialized) { 3499 return true; 3500 } 3501 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3502 // Compile time verification failed with a soft error. Compile time verification can fail 3503 // because we have incomplete type information. Consider the following: 3504 // class ... { 3505 // Foo x; 3506 // .... () { 3507 // if (...) { 3508 // v1 gets assigned a type of resolved class Foo 3509 // } else { 3510 // v1 gets assigned a type of unresolved class Bar 3511 // } 3512 // iput x = v1 3513 // } } 3514 // when we merge v1 following the if-the-else it results in Conflict 3515 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3516 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3517 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3518 // at compile time). 3519 return false; 3520 } 3521 if (oat_file_class_status == mirror::Class::kStatusError) { 3522 // Compile time verification failed with a hard error. This is caused by invalid instructions 3523 // in the class. These errors are unrecoverable. 3524 return false; 3525 } 3526 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3527 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3528 // not loading the class. 3529 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3530 // isn't a problem and this case shouldn't occur 3531 return false; 3532 } 3533 std::string temp; 3534 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3535 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3536 << klass->GetDescriptor(&temp); 3537 3538 return false; 3539} 3540 3541void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3542 ConstHandle<mirror::Class> klass) { 3543 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3544 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3545 } 3546 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3547 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3548 } 3549} 3550 3551void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3552 mirror::ArtMethod* method) { 3553 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3554 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3555 if (code_item == NULL) { 3556 return; // native or abstract method 3557 } 3558 if (code_item->tries_size_ == 0) { 3559 return; // nothing to process 3560 } 3561 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3562 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3563 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3564 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3565 CatchHandlerIterator iterator(handlers_ptr); 3566 for (; iterator.HasNext(); iterator.Next()) { 3567 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3568 // unresolved exception types will be ignored by exception delivery 3569 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3570 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3571 if (exception_type == NULL) { 3572 DCHECK(Thread::Current()->IsExceptionPending()); 3573 Thread::Current()->ClearException(); 3574 } 3575 } 3576 } 3577 handlers_ptr = iterator.EndDataPointer(); 3578 } 3579} 3580 3581static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3582static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3583 ConstHandle<mirror::ArtMethod> prototype); 3584 3585mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3586 jobjectArray interfaces, jobject loader, 3587 jobjectArray methods, jobjectArray throws) { 3588 Thread* self = soa.Self(); 3589 StackHandleScope<8> hs(self); 3590 Handle<mirror::Class> klass(hs.NewHandle( 3591 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3592 if (klass.Get() == NULL) { 3593 CHECK(self->IsExceptionPending()); // OOME. 3594 return NULL; 3595 } 3596 DCHECK(klass->GetClass() != NULL); 3597 klass->SetObjectSize(sizeof(mirror::Proxy)); 3598 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3599 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3600 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3601 klass->SetName(soa.Decode<mirror::String*>(name)); 3602 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3603 klass->SetDexCache(proxy_class->GetDexCache()); 3604 klass->SetStatus(mirror::Class::kStatusIdx, self); 3605 3606 // Instance fields are inherited, but we add a couple of static fields... 3607 { 3608 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3609 if (UNLIKELY(sfields == NULL)) { 3610 CHECK(self->IsExceptionPending()); // OOME. 3611 return NULL; 3612 } 3613 klass->SetSFields(sfields); 3614 } 3615 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3616 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3617 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3618 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3619 CHECK(self->IsExceptionPending()); // OOME. 3620 return nullptr; 3621 } 3622 klass->SetStaticField(0, interfaces_sfield.Get()); 3623 interfaces_sfield->SetDexFieldIndex(0); 3624 interfaces_sfield->SetDeclaringClass(klass.Get()); 3625 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3626 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3627 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3628 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3629 CHECK(self->IsExceptionPending()); // OOME. 3630 return nullptr; 3631 } 3632 klass->SetStaticField(1, throws_sfield.Get()); 3633 throws_sfield->SetDexFieldIndex(1); 3634 throws_sfield->SetDeclaringClass(klass.Get()); 3635 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3636 3637 // Proxies have 1 direct method, the constructor 3638 { 3639 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3640 if (UNLIKELY(directs == nullptr)) { 3641 CHECK(self->IsExceptionPending()); // OOME. 3642 return nullptr; 3643 } 3644 klass->SetDirectMethods(directs); 3645 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3646 if (UNLIKELY(constructor == nullptr)) { 3647 CHECK(self->IsExceptionPending()); // OOME. 3648 return nullptr; 3649 } 3650 klass->SetDirectMethod(0, constructor); 3651 } 3652 3653 // Create virtual method using specified prototypes. 3654 size_t num_virtual_methods = 3655 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3656 { 3657 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3658 num_virtual_methods); 3659 if (UNLIKELY(virtuals == NULL)) { 3660 CHECK(self->IsExceptionPending()); // OOME. 3661 return NULL; 3662 } 3663 klass->SetVirtualMethods(virtuals); 3664 } 3665 for (size_t i = 0; i < num_virtual_methods; ++i) { 3666 StackHandleScope<1> hs(self); 3667 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3668 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3669 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3670 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3671 if (UNLIKELY(clone == nullptr)) { 3672 CHECK(self->IsExceptionPending()); // OOME. 3673 return nullptr; 3674 } 3675 klass->SetVirtualMethod(i, clone); 3676 } 3677 3678 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3679 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3680 self->AssertNoPendingException(); 3681 3682 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3683 mirror::Class* new_class = nullptr; 3684 { 3685 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3686 // Link the fields and virtual methods, creating vtable and iftables 3687 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3688 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3689 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3690 klass->SetStatus(mirror::Class::kStatusError, self); 3691 return nullptr; 3692 } 3693 } 3694 3695 CHECK(klass->IsRetired()); 3696 CHECK_NE(klass.Get(), new_class); 3697 klass.Assign(new_class); 3698 3699 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3700 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3701 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3702 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3703 3704 { 3705 // Lock on klass is released. Lock new class object. 3706 ObjectLock<mirror::Class> initialization_lock(self, klass); 3707 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3708 } 3709 3710 // sanity checks 3711 if (kIsDebugBuild) { 3712 CHECK(klass->GetIFields() == nullptr); 3713 CheckProxyConstructor(klass->GetDirectMethod(0)); 3714 for (size_t i = 0; i < num_virtual_methods; ++i) { 3715 StackHandleScope<2> hs(self); 3716 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3717 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3718 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3719 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3720 CheckProxyMethod(virtual_method, prototype); 3721 } 3722 3723 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3724 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3725 decoded_name->ToModifiedUtf8().c_str())); 3726 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3727 3728 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3729 decoded_name->ToModifiedUtf8().c_str())); 3730 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3731 3732 CHECK_EQ(klass.Get()->GetInterfaces(), 3733 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3734 CHECK_EQ(klass.Get()->GetThrows(), 3735 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3736 } 3737 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3738 CHECK(existing == nullptr); 3739 return klass.Get(); 3740} 3741 3742std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3743 DCHECK(proxy_class->IsProxyClass()); 3744 mirror::String* name = proxy_class->GetName(); 3745 DCHECK(name != NULL); 3746 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3747} 3748 3749mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3750 mirror::ArtMethod* proxy_method) { 3751 DCHECK(proxy_class->IsProxyClass()); 3752 DCHECK(proxy_method->IsProxyMethod()); 3753 // Locate the dex cache of the original interface/Object 3754 mirror::DexCache* dex_cache = nullptr; 3755 { 3756 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3757 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3758 mirror::DexCache* a_dex_cache = GetDexCache(i); 3759 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3760 dex_cache = a_dex_cache; 3761 break; 3762 } 3763 } 3764 } 3765 CHECK(dex_cache != nullptr); 3766 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3767 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3768 CHECK(resolved_method != nullptr); 3769 return resolved_method; 3770} 3771 3772 3773mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3774 ConstHandle<mirror::Class> klass, 3775 mirror::Class* proxy_class) { 3776 // Create constructor for Proxy that must initialize h 3777 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3778 proxy_class->GetDirectMethods(); 3779 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3780 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3781 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3782 // code_ too) 3783 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3784 if (constructor == nullptr) { 3785 CHECK(self->IsExceptionPending()); // OOME. 3786 return nullptr; 3787 } 3788 // Make this constructor public and fix the class to be our Proxy version 3789 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3790 constructor->SetDeclaringClass(klass.Get()); 3791 return constructor; 3792} 3793 3794static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3795 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3796 CHECK(constructor->IsConstructor()); 3797 CHECK_STREQ(constructor->GetName(), "<init>"); 3798 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3799 "(Ljava/lang/reflect/InvocationHandler;)V"); 3800 DCHECK(constructor->IsPublic()); 3801} 3802 3803mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3804 ConstHandle<mirror::Class> klass, 3805 ConstHandle<mirror::ArtMethod> prototype) { 3806 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3807 // prototype method 3808 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3809 prototype.Get()); 3810 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3811 // as necessary 3812 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3813 if (UNLIKELY(method == NULL)) { 3814 CHECK(self->IsExceptionPending()); // OOME. 3815 return NULL; 3816 } 3817 3818 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3819 // the intersection of throw exceptions as defined in Proxy 3820 method->SetDeclaringClass(klass.Get()); 3821 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3822 3823 // At runtime the method looks like a reference and argument saving method, clone the code 3824 // related parameters from this method. 3825 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3826 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3827 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3828 3829 return method; 3830} 3831 3832static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3833 ConstHandle<mirror::ArtMethod> prototype) 3834 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3835 // Basic sanity 3836 CHECK(!prototype->IsFinal()); 3837 CHECK(method->IsFinal()); 3838 CHECK(!method->IsAbstract()); 3839 3840 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3841 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3842 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3843 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3844 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3845 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3846 3847 StackHandleScope<2> hs(Thread::Current()); 3848 MethodHelper mh(hs.NewHandle(method.Get())); 3849 MethodHelper mh2(hs.NewHandle(prototype.Get())); 3850 CHECK_STREQ(method->GetName(), prototype->GetName()); 3851 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3852 // More complex sanity - via dex cache 3853 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3854} 3855 3856static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3857 bool can_init_parents) 3858 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3859 if (can_init_statics && can_init_parents) { 3860 return true; 3861 } 3862 if (!can_init_statics) { 3863 // Check if there's a class initializer. 3864 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3865 if (clinit != NULL) { 3866 return false; 3867 } 3868 // Check if there are encoded static values needing initialization. 3869 if (klass->NumStaticFields() != 0) { 3870 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3871 DCHECK(dex_class_def != NULL); 3872 if (dex_class_def->static_values_off_ != 0) { 3873 return false; 3874 } 3875 } 3876 } 3877 if (!klass->IsInterface() && klass->HasSuperClass()) { 3878 mirror::Class* super_class = klass->GetSuperClass(); 3879 if (!can_init_parents && !super_class->IsInitialized()) { 3880 return false; 3881 } else { 3882 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3883 return false; 3884 } 3885 } 3886 } 3887 return true; 3888} 3889 3890bool ClassLinker::IsInitialized() const { 3891 return init_done_; 3892} 3893 3894bool ClassLinker::InitializeClass(ConstHandle<mirror::Class> klass, bool can_init_statics, 3895 bool can_init_parents) { 3896 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3897 3898 // Are we already initialized and therefore done? 3899 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3900 // an initialized class will never change its state. 3901 if (klass->IsInitialized()) { 3902 return true; 3903 } 3904 3905 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3906 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3907 return false; 3908 } 3909 3910 Thread* self = Thread::Current(); 3911 uint64_t t0; 3912 { 3913 ObjectLock<mirror::Class> lock(self, klass); 3914 3915 // Re-check under the lock in case another thread initialized ahead of us. 3916 if (klass->IsInitialized()) { 3917 return true; 3918 } 3919 3920 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3921 if (klass->IsErroneous()) { 3922 ThrowEarlierClassFailure(klass.Get()); 3923 return false; 3924 } 3925 3926 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3927 3928 if (!klass->IsVerified()) { 3929 VerifyClass(klass); 3930 if (!klass->IsVerified()) { 3931 // We failed to verify, expect either the klass to be erroneous or verification failed at 3932 // compile time. 3933 if (klass->IsErroneous()) { 3934 CHECK(self->IsExceptionPending()); 3935 } else { 3936 CHECK(Runtime::Current()->IsCompiler()); 3937 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3938 } 3939 return false; 3940 } 3941 } 3942 3943 // If the class is kStatusInitializing, either this thread is 3944 // initializing higher up the stack or another thread has beat us 3945 // to initializing and we need to wait. Either way, this 3946 // invocation of InitializeClass will not be responsible for 3947 // running <clinit> and will return. 3948 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3949 // We caught somebody else in the act; was it us? 3950 if (klass->GetClinitThreadId() == self->GetTid()) { 3951 // Yes. That's fine. Return so we can continue initializing. 3952 return true; 3953 } 3954 // No. That's fine. Wait for another thread to finish initializing. 3955 return WaitForInitializeClass(klass, self, lock); 3956 } 3957 3958 if (!ValidateSuperClassDescriptors(klass)) { 3959 klass->SetStatus(mirror::Class::kStatusError, self); 3960 return false; 3961 } 3962 3963 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3964 3965 // From here out other threads may observe that we're initializing and so changes of state 3966 // require the a notification. 3967 klass->SetClinitThreadId(self->GetTid()); 3968 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3969 3970 t0 = NanoTime(); 3971 } 3972 3973 // Initialize super classes, must be done while initializing for the JLS. 3974 if (!klass->IsInterface() && klass->HasSuperClass()) { 3975 mirror::Class* super_class = klass->GetSuperClass(); 3976 if (!super_class->IsInitialized()) { 3977 CHECK(!super_class->IsInterface()); 3978 CHECK(can_init_parents); 3979 StackHandleScope<1> hs(self); 3980 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3981 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3982 if (!super_initialized) { 3983 // The super class was verified ahead of entering initializing, we should only be here if 3984 // the super class became erroneous due to initialization. 3985 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3986 << "Super class initialization failed for " 3987 << PrettyDescriptor(handle_scope_super.Get()) 3988 << " that has unexpected status " << handle_scope_super->GetStatus() 3989 << "\nPending exception:\n" 3990 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3991 ObjectLock<mirror::Class> lock(self, klass); 3992 // Initialization failed because the super-class is erroneous. 3993 klass->SetStatus(mirror::Class::kStatusError, self); 3994 return false; 3995 } 3996 } 3997 } 3998 3999 if (klass->NumStaticFields() > 0) { 4000 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4001 CHECK(dex_class_def != NULL); 4002 const DexFile& dex_file = klass->GetDexFile(); 4003 StackHandleScope<3> hs(self); 4004 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4005 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4006 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4007 this, *dex_class_def); 4008 const byte* class_data = dex_file.GetClassData(*dex_class_def); 4009 ClassDataItemIterator field_it(dex_file, class_data); 4010 if (value_it.HasNext()) { 4011 DCHECK(field_it.HasNextStaticField()); 4012 CHECK(can_init_statics); 4013 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4014 StackHandleScope<1> hs(self); 4015 Handle<mirror::ArtField> field(hs.NewHandle( 4016 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4017 if (Runtime::Current()->IsActiveTransaction()) { 4018 value_it.ReadValueToField<true>(field); 4019 } else { 4020 value_it.ReadValueToField<false>(field); 4021 } 4022 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4023 } 4024 } 4025 } 4026 4027 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4028 if (clinit != NULL) { 4029 CHECK(can_init_statics); 4030 JValue result; 4031 clinit->Invoke(self, NULL, 0, &result, "V"); 4032 } 4033 4034 uint64_t t1 = NanoTime(); 4035 4036 bool success = true; 4037 { 4038 ObjectLock<mirror::Class> lock(self, klass); 4039 4040 if (self->IsExceptionPending()) { 4041 WrapExceptionInInitializer(); 4042 klass->SetStatus(mirror::Class::kStatusError, self); 4043 success = false; 4044 } else { 4045 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4046 RuntimeStats* thread_stats = self->GetStats(); 4047 ++global_stats->class_init_count; 4048 ++thread_stats->class_init_count; 4049 global_stats->class_init_time_ns += (t1 - t0); 4050 thread_stats->class_init_time_ns += (t1 - t0); 4051 // Set the class as initialized except if failed to initialize static fields. 4052 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4053 if (VLOG_IS_ON(class_linker)) { 4054 std::string temp; 4055 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4056 klass->GetLocation(); 4057 } 4058 // Opportunistically set static method trampolines to their destination. 4059 FixupStaticTrampolines(klass.Get()); 4060 } 4061 } 4062 return success; 4063} 4064 4065bool ClassLinker::WaitForInitializeClass(ConstHandle<mirror::Class> klass, Thread* self, 4066 ObjectLock<mirror::Class>& lock) 4067 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4068 while (true) { 4069 self->AssertNoPendingException(); 4070 CHECK(!klass->IsInitialized()); 4071 lock.WaitIgnoringInterrupts(); 4072 4073 // When we wake up, repeat the test for init-in-progress. If 4074 // there's an exception pending (only possible if 4075 // "interruptShouldThrow" was set), bail out. 4076 if (self->IsExceptionPending()) { 4077 WrapExceptionInInitializer(); 4078 klass->SetStatus(mirror::Class::kStatusError, self); 4079 return false; 4080 } 4081 // Spurious wakeup? Go back to waiting. 4082 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4083 continue; 4084 } 4085 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4086 // Compile time initialization failed. 4087 return false; 4088 } 4089 if (klass->IsErroneous()) { 4090 // The caller wants an exception, but it was thrown in a 4091 // different thread. Synthesize one here. 4092 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4093 PrettyDescriptor(klass.Get()).c_str()); 4094 return false; 4095 } 4096 if (klass->IsInitialized()) { 4097 return true; 4098 } 4099 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4100 << klass->GetStatus(); 4101 } 4102 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4103} 4104 4105bool ClassLinker::ValidateSuperClassDescriptors(ConstHandle<mirror::Class> klass) { 4106 if (klass->IsInterface()) { 4107 return true; 4108 } 4109 // Begin with the methods local to the superclass. 4110 StackHandleScope<2> hs(Thread::Current()); 4111 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4112 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4113 if (klass->HasSuperClass() && 4114 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4115 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4116 mh.ChangeMethod(klass->GetVTableEntry(i)); 4117 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4118 if (mh.GetMethod() != super_mh.GetMethod() && 4119 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4120 ThrowLinkageError(klass.Get(), 4121 "Class %s method %s resolves differently in superclass %s", 4122 PrettyDescriptor(klass.Get()).c_str(), 4123 PrettyMethod(mh.GetMethod()).c_str(), 4124 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4125 return false; 4126 } 4127 } 4128 } 4129 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4130 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4131 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4132 for (uint32_t j = 0; j < num_methods; ++j) { 4133 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4134 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4135 if (mh.GetMethod() != super_mh.GetMethod() && 4136 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4137 ThrowLinkageError(klass.Get(), 4138 "Class %s method %s resolves differently in interface %s", 4139 PrettyDescriptor(klass.Get()).c_str(), 4140 PrettyMethod(mh.GetMethod()).c_str(), 4141 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4142 return false; 4143 } 4144 } 4145 } 4146 } 4147 return true; 4148} 4149 4150bool ClassLinker::EnsureInitialized(ConstHandle<mirror::Class> c, bool can_init_fields, 4151 bool can_init_parents) { 4152 DCHECK(c.Get() != nullptr); 4153 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 4154 if (!success && can_init_fields && can_init_parents) { 4155 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 4156 } 4157 return success; 4158} 4159 4160void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4161 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4162 if (fields != nullptr) { 4163 for (int index = 0; index < fields->GetLength(); index ++) { 4164 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4165 fields->Get(index)->SetDeclaringClass(new_class); 4166 } 4167 } 4168 } 4169 4170 fields = new_class->GetSFields(); 4171 if (fields != nullptr) { 4172 for (int index = 0; index < fields->GetLength(); index ++) { 4173 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4174 fields->Get(index)->SetDeclaringClass(new_class); 4175 } 4176 } 4177 } 4178 4179 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4180 if (methods != nullptr) { 4181 for (int index = 0; index < methods->GetLength(); index ++) { 4182 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4183 methods->Get(index)->SetDeclaringClass(new_class); 4184 } 4185 } 4186 } 4187 4188 methods = new_class->GetVirtualMethods(); 4189 if (methods != nullptr) { 4190 for (int index = 0; index < methods->GetLength(); index ++) { 4191 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4192 methods->Get(index)->SetDeclaringClass(new_class); 4193 } 4194 } 4195 } 4196} 4197 4198bool ClassLinker::LinkClass(Thread* self, const char* descriptor, ConstHandle<mirror::Class> klass, 4199 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces, 4200 mirror::Class** new_class) { 4201 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4202 4203 if (!LinkSuperClass(klass)) { 4204 return false; 4205 } 4206 if (!LinkMethods(self, klass, interfaces)) { 4207 return false; 4208 } 4209 if (!LinkInstanceFields(klass)) { 4210 return false; 4211 } 4212 size_t class_size; 4213 if (!LinkStaticFields(klass, &class_size)) { 4214 return false; 4215 } 4216 CreateReferenceInstanceOffsets(klass); 4217 CreateReferenceStaticOffsets(klass); 4218 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4219 4220 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4221 // We don't need to retire this class as it has no embedded tables or it was created the 4222 // correct size during class linker initialization. 4223 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4224 4225 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4226 klass->PopulateEmbeddedImtAndVTable(); 4227 } 4228 4229 // This will notify waiters on klass that saw the not yet resolved 4230 // class in the class_table_ during EnsureResolved. 4231 klass->SetStatus(mirror::Class::kStatusResolved, self); 4232 *new_class = klass.Get(); 4233 } else { 4234 CHECK(!klass->IsResolved()); 4235 // Retire the temporary class and create the correctly sized resolved class. 4236 *new_class = klass->CopyOf(self, class_size); 4237 if (UNLIKELY(*new_class == NULL)) { 4238 CHECK(self->IsExceptionPending()); // Expect an OOME. 4239 klass->SetStatus(mirror::Class::kStatusError, self); 4240 return false; 4241 } 4242 4243 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4244 StackHandleScope<1> hs(self); 4245 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4246 ObjectLock<mirror::Class> lock(self, new_class_h); 4247 4248 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4249 4250 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4251 CHECK(existing == NULL || existing == klass.Get()); 4252 4253 // This will notify waiters on temp class that saw the not yet resolved class in the 4254 // class_table_ during EnsureResolved. 4255 klass->SetStatus(mirror::Class::kStatusRetired, self); 4256 4257 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4258 // This will notify waiters on new_class that saw the not yet resolved 4259 // class in the class_table_ during EnsureResolved. 4260 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4261 } 4262 return true; 4263} 4264 4265bool ClassLinker::LoadSuperAndInterfaces(ConstHandle<mirror::Class> klass, const DexFile& dex_file) { 4266 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4267 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4268 uint16_t super_class_idx = class_def.superclass_idx_; 4269 if (super_class_idx != DexFile::kDexNoIndex16) { 4270 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4271 if (super_class == NULL) { 4272 DCHECK(Thread::Current()->IsExceptionPending()); 4273 return false; 4274 } 4275 // Verify 4276 if (!klass->CanAccess(super_class)) { 4277 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4278 PrettyDescriptor(super_class).c_str(), 4279 PrettyDescriptor(klass.Get()).c_str()); 4280 return false; 4281 } 4282 CHECK(super_class->IsResolved()); 4283 klass->SetSuperClass(super_class); 4284 } 4285 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4286 if (interfaces != NULL) { 4287 for (size_t i = 0; i < interfaces->Size(); i++) { 4288 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4289 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4290 if (interface == NULL) { 4291 DCHECK(Thread::Current()->IsExceptionPending()); 4292 return false; 4293 } 4294 // Verify 4295 if (!klass->CanAccess(interface)) { 4296 // TODO: the RI seemed to ignore this in my testing. 4297 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4298 PrettyDescriptor(interface).c_str(), 4299 PrettyDescriptor(klass.Get()).c_str()); 4300 return false; 4301 } 4302 } 4303 } 4304 // Mark the class as loaded. 4305 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4306 return true; 4307} 4308 4309bool ClassLinker::LinkSuperClass(ConstHandle<mirror::Class> klass) { 4310 CHECK(!klass->IsPrimitive()); 4311 mirror::Class* super = klass->GetSuperClass(); 4312 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4313 if (super != NULL) { 4314 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4315 return false; 4316 } 4317 return true; 4318 } 4319 if (super == NULL) { 4320 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4321 PrettyDescriptor(klass.Get()).c_str()); 4322 return false; 4323 } 4324 // Verify 4325 if (super->IsFinal() || super->IsInterface()) { 4326 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4327 PrettyDescriptor(super).c_str(), 4328 PrettyDescriptor(klass.Get()).c_str(), 4329 super->IsFinal() ? "declared final" : "an interface"); 4330 return false; 4331 } 4332 if (!klass->CanAccess(super)) { 4333 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4334 PrettyDescriptor(super).c_str(), 4335 PrettyDescriptor(klass.Get()).c_str()); 4336 return false; 4337 } 4338 4339 // Inherit kAccClassIsFinalizable from the superclass in case this 4340 // class doesn't override finalize. 4341 if (super->IsFinalizable()) { 4342 klass->SetFinalizable(); 4343 } 4344 4345 // Inherit reference flags (if any) from the superclass. 4346 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4347 if (reference_flags != 0) { 4348 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4349 } 4350 // Disallow custom direct subclasses of java.lang.ref.Reference. 4351 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4352 ThrowLinkageError(klass.Get(), 4353 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4354 PrettyDescriptor(klass.Get()).c_str()); 4355 return false; 4356 } 4357 4358 if (kIsDebugBuild) { 4359 // Ensure super classes are fully resolved prior to resolving fields.. 4360 while (super != NULL) { 4361 CHECK(super->IsResolved()); 4362 super = super->GetSuperClass(); 4363 } 4364 } 4365 return true; 4366} 4367 4368// Populate the class vtable and itable. Compute return type indices. 4369bool ClassLinker::LinkMethods(Thread* self, ConstHandle<mirror::Class> klass, 4370 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4371 if (klass->IsInterface()) { 4372 // No vtable. 4373 size_t count = klass->NumVirtualMethods(); 4374 if (!IsUint(16, count)) { 4375 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4376 return false; 4377 } 4378 for (size_t i = 0; i < count; ++i) { 4379 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4380 } 4381 // Link interface method tables 4382 return LinkInterfaceMethods(klass, interfaces); 4383 } else { 4384 // Link virtual and interface method tables 4385 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4386 } 4387 return true; 4388} 4389 4390bool ClassLinker::LinkVirtualMethods(Thread* self, ConstHandle<mirror::Class> klass) { 4391 if (klass->HasSuperClass()) { 4392 uint32_t max_count = klass->NumVirtualMethods() + 4393 klass->GetSuperClass()->GetVTableLength(); 4394 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4395 CHECK_LE(actual_count, max_count); 4396 StackHandleScope<4> hs(self); 4397 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4398 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4399 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4400 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4401 if (UNLIKELY(vtable.Get() == nullptr)) { 4402 CHECK(self->IsExceptionPending()); // OOME. 4403 return false; 4404 } 4405 int len = super_class->GetVTableLength(); 4406 for (int i = 0; i < len; i++) { 4407 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4408 } 4409 } else { 4410 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4411 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4412 if (UNLIKELY(vtable.Get() == nullptr)) { 4413 CHECK(self->IsExceptionPending()); // OOME. 4414 return false; 4415 } 4416 } 4417 4418 // See if any of our virtual methods override the superclass. 4419 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4420 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4421 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4422 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4423 local_mh.ChangeMethod(local_method); 4424 size_t j = 0; 4425 for (; j < actual_count; ++j) { 4426 mirror::ArtMethod* super_method = vtable->Get(j); 4427 super_mh.ChangeMethod(super_method); 4428 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4429 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4430 super_method->GetAccessFlags())) { 4431 if (super_method->IsFinal()) { 4432 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4433 PrettyMethod(local_method).c_str(), 4434 super_method->GetDeclaringClassDescriptor()); 4435 return false; 4436 } 4437 vtable->Set<false>(j, local_method); 4438 local_method->SetMethodIndex(j); 4439 break; 4440 } else { 4441 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4442 << " would have incorrectly overridden the package-private method in " 4443 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4444 } 4445 } 4446 } 4447 if (j == actual_count) { 4448 // Not overriding, append. 4449 vtable->Set<false>(actual_count, local_method); 4450 local_method->SetMethodIndex(actual_count); 4451 actual_count += 1; 4452 } 4453 } 4454 if (!IsUint(16, actual_count)) { 4455 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4456 return false; 4457 } 4458 // Shrink vtable if possible 4459 CHECK_LE(actual_count, max_count); 4460 if (actual_count < max_count) { 4461 vtable.Assign(vtable->CopyOf(self, actual_count)); 4462 if (UNLIKELY(vtable.Get() == NULL)) { 4463 CHECK(self->IsExceptionPending()); // OOME. 4464 return false; 4465 } 4466 } 4467 klass->SetVTable(vtable.Get()); 4468 } else { 4469 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4470 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4471 if (!IsUint(16, num_virtual_methods)) { 4472 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4473 return false; 4474 } 4475 StackHandleScope<1> hs(self); 4476 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4477 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4478 if (UNLIKELY(vtable.Get() == NULL)) { 4479 CHECK(self->IsExceptionPending()); // OOME. 4480 return false; 4481 } 4482 for (size_t i = 0; i < num_virtual_methods; ++i) { 4483 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4484 vtable->Set<false>(i, virtual_method); 4485 virtual_method->SetMethodIndex(i & 0xFFFF); 4486 } 4487 klass->SetVTable(vtable.Get()); 4488 } 4489 return true; 4490} 4491 4492bool ClassLinker::LinkInterfaceMethods(ConstHandle<mirror::Class> klass, 4493 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4494 Thread* const self = Thread::Current(); 4495 Runtime* const runtime = Runtime::Current(); 4496 // Set the imt table to be all conflicts by default. 4497 klass->SetImTable(runtime->GetDefaultImt()); 4498 size_t super_ifcount; 4499 if (klass->HasSuperClass()) { 4500 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4501 } else { 4502 super_ifcount = 0; 4503 } 4504 uint32_t num_interfaces = 4505 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4506 size_t ifcount = super_ifcount + num_interfaces; 4507 for (size_t i = 0; i < num_interfaces; i++) { 4508 mirror::Class* interface = 4509 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4510 interfaces->Get(i); 4511 ifcount += interface->GetIfTableCount(); 4512 } 4513 if (ifcount == 0) { 4514 // Class implements no interfaces. 4515 DCHECK_EQ(klass->GetIfTableCount(), 0); 4516 DCHECK(klass->GetIfTable() == NULL); 4517 return true; 4518 } 4519 if (ifcount == super_ifcount) { 4520 // Class implements same interfaces as parent, are any of these not marker interfaces? 4521 bool has_non_marker_interface = false; 4522 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4523 for (size_t i = 0; i < ifcount; ++i) { 4524 if (super_iftable->GetMethodArrayCount(i) > 0) { 4525 has_non_marker_interface = true; 4526 break; 4527 } 4528 } 4529 if (!has_non_marker_interface) { 4530 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4531 klass->SetIfTable(super_iftable); 4532 return true; 4533 } 4534 } 4535 StackHandleScope<5> hs(self); 4536 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4537 if (UNLIKELY(iftable.Get() == NULL)) { 4538 CHECK(self->IsExceptionPending()); // OOME. 4539 return false; 4540 } 4541 if (super_ifcount != 0) { 4542 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4543 for (size_t i = 0; i < super_ifcount; i++) { 4544 mirror::Class* super_interface = super_iftable->GetInterface(i); 4545 iftable->SetInterface(i, super_interface); 4546 } 4547 } 4548 // Flatten the interface inheritance hierarchy. 4549 size_t idx = super_ifcount; 4550 for (size_t i = 0; i < num_interfaces; i++) { 4551 mirror::Class* interface = 4552 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4553 interfaces->Get(i); 4554 DCHECK(interface != NULL); 4555 if (!interface->IsInterface()) { 4556 std::string temp; 4557 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4558 PrettyDescriptor(klass.Get()).c_str(), 4559 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4560 return false; 4561 } 4562 // Check if interface is already in iftable 4563 bool duplicate = false; 4564 for (size_t j = 0; j < idx; j++) { 4565 mirror::Class* existing_interface = iftable->GetInterface(j); 4566 if (existing_interface == interface) { 4567 duplicate = true; 4568 break; 4569 } 4570 } 4571 if (!duplicate) { 4572 // Add this non-duplicate interface. 4573 iftable->SetInterface(idx++, interface); 4574 // Add this interface's non-duplicate super-interfaces. 4575 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4576 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4577 bool super_duplicate = false; 4578 for (size_t k = 0; k < idx; k++) { 4579 mirror::Class* existing_interface = iftable->GetInterface(k); 4580 if (existing_interface == super_interface) { 4581 super_duplicate = true; 4582 break; 4583 } 4584 } 4585 if (!super_duplicate) { 4586 iftable->SetInterface(idx++, super_interface); 4587 } 4588 } 4589 } 4590 } 4591 // Shrink iftable in case duplicates were found 4592 if (idx < ifcount) { 4593 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4594 if (UNLIKELY(iftable.Get() == NULL)) { 4595 CHECK(self->IsExceptionPending()); // OOME. 4596 return false; 4597 } 4598 ifcount = idx; 4599 } else { 4600 CHECK_EQ(idx, ifcount); 4601 } 4602 klass->SetIfTable(iftable.Get()); 4603 4604 // If we're an interface, we don't need the vtable pointers, so we're done. 4605 if (klass->IsInterface()) { 4606 return true; 4607 } 4608 // Allocate imtable 4609 bool imtable_changed = false; 4610 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4611 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4612 if (UNLIKELY(imtable.Get() == NULL)) { 4613 CHECK(self->IsExceptionPending()); // OOME. 4614 return false; 4615 } 4616 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4617 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4618 size_t max_miranda_methods = 0; // The max size of miranda_list. 4619 for (size_t i = 0; i < ifcount; ++i) { 4620 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4621 } 4622 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4623 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4624 size_t miranda_list_size = 0; // The current size of miranda_list. 4625 for (size_t i = 0; i < ifcount; ++i) { 4626 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4627 if (num_methods > 0) { 4628 StackHandleScope<2> hs(self); 4629 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4630 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4631 if (UNLIKELY(method_array.Get() == nullptr)) { 4632 CHECK(self->IsExceptionPending()); // OOME. 4633 return false; 4634 } 4635 iftable->SetMethodArray(i, method_array.Get()); 4636 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4637 hs.NewHandle(klass->GetVTableDuringLinking())); 4638 for (size_t j = 0; j < num_methods; ++j) { 4639 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4640 int32_t k; 4641 // For each method listed in the interface's method list, find the 4642 // matching method in our class's method list. We want to favor the 4643 // subclass over the superclass, which just requires walking 4644 // back from the end of the vtable. (This only matters if the 4645 // superclass defines a private method and this class redefines 4646 // it -- otherwise it would use the same vtable slot. In .dex files 4647 // those don't end up in the virtual method table, so it shouldn't 4648 // matter which direction we go. We walk it backward anyway.) 4649 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4650 vtable_mh.ChangeMethod(vtable->Get(k)); 4651 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4652 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4653 ThrowIllegalAccessError( 4654 klass.Get(), 4655 "Method '%s' implementing interface method '%s' is not public", 4656 PrettyMethod(vtable_mh.Get()).c_str(), 4657 PrettyMethod(interface_mh.Get()).c_str()); 4658 return false; 4659 } 4660 method_array->Set<false>(j, vtable_mh.Get()); 4661 // Place method in imt if entry is empty, place conflict otherwise. 4662 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4663 if (imtable->Get(imt_index) == NULL) { 4664 imtable->Set<false>(imt_index, vtable_mh.Get()); 4665 imtable_changed = true; 4666 } else { 4667 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4668 } 4669 break; 4670 } 4671 } 4672 if (k < 0) { 4673 StackHandleScope<1> hs(self); 4674 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4675 for (size_t l = 0; l < miranda_list_size; ++l) { 4676 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4677 DCHECK(mir_method != nullptr); 4678 vtable_mh.ChangeMethod(mir_method); 4679 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4680 miranda_method.Assign(mir_method); 4681 break; 4682 } 4683 } 4684 if (miranda_method.Get() == NULL) { 4685 // Point the interface table at a phantom slot. 4686 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4687 if (UNLIKELY(miranda_method.Get() == NULL)) { 4688 CHECK(self->IsExceptionPending()); // OOME. 4689 return false; 4690 } 4691 DCHECK_LT(miranda_list_size, max_miranda_methods); 4692 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4693 } 4694 method_array->Set<false>(j, miranda_method.Get()); 4695 } 4696 } 4697 } 4698 } 4699 if (imtable_changed) { 4700 // Fill in empty entries in interface method table with conflict. 4701 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4702 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4703 if (imtable->Get(i) == NULL) { 4704 imtable->Set<false>(i, imt_conflict_method); 4705 } 4706 } 4707 klass->SetImTable(imtable.Get()); 4708 } 4709 if (miranda_list_size > 0) { 4710 int old_method_count = klass->NumVirtualMethods(); 4711 int new_method_count = old_method_count + miranda_list_size; 4712 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4713 if (old_method_count == 0) { 4714 virtuals = AllocArtMethodArray(self, new_method_count); 4715 } else { 4716 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4717 } 4718 if (UNLIKELY(virtuals == NULL)) { 4719 CHECK(self->IsExceptionPending()); // OOME. 4720 return false; 4721 } 4722 klass->SetVirtualMethods(virtuals); 4723 4724 StackHandleScope<1> hs(self); 4725 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4726 hs.NewHandle(klass->GetVTableDuringLinking())); 4727 CHECK(vtable.Get() != NULL); 4728 int old_vtable_count = vtable->GetLength(); 4729 int new_vtable_count = old_vtable_count + miranda_list_size; 4730 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4731 if (UNLIKELY(vtable.Get() == NULL)) { 4732 CHECK(self->IsExceptionPending()); // OOME. 4733 return false; 4734 } 4735 for (size_t i = 0; i < miranda_list_size; ++i) { 4736 mirror::ArtMethod* method = miranda_list->Get(i); 4737 // Leave the declaring class alone as type indices are relative to it 4738 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4739 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4740 klass->SetVirtualMethod(old_method_count + i, method); 4741 vtable->Set<false>(old_vtable_count + i, method); 4742 } 4743 // TODO: do not assign to the vtable field until it is fully constructed. 4744 klass->SetVTable(vtable.Get()); 4745 } 4746 4747 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4748 for (int i = 0; i < vtable->GetLength(); ++i) { 4749 CHECK(vtable->Get(i) != NULL); 4750 } 4751 4752// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4753 4754 return true; 4755} 4756 4757bool ClassLinker::LinkInstanceFields(ConstHandle<mirror::Class> klass) { 4758 CHECK(klass.Get() != NULL); 4759 return LinkFields(klass, false, nullptr); 4760} 4761 4762bool ClassLinker::LinkStaticFields(ConstHandle<mirror::Class> klass, size_t* class_size) { 4763 CHECK(klass.Get() != NULL); 4764 return LinkFields(klass, true, class_size); 4765} 4766 4767struct LinkFieldsComparator { 4768 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4769 } 4770 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4771 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4772 NO_THREAD_SAFETY_ANALYSIS { 4773 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4774 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4775 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4776 if (type1 != type2) { 4777 bool is_primitive1 = type1 != Primitive::kPrimNot; 4778 bool is_primitive2 = type2 != Primitive::kPrimNot; 4779 if (type1 != type2) { 4780 if (is_primitive1 && is_primitive2) { 4781 // Larger primitive types go first. 4782 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 4783 } else { 4784 // Reference always goes first. 4785 return !is_primitive1; 4786 } 4787 } 4788 } 4789 // same basic group? then sort by string. 4790 return strcmp(field1->GetName(), field2->GetName()) < 0; 4791 } 4792}; 4793 4794bool ClassLinker::LinkFields(ConstHandle<mirror::Class> klass, bool is_static, size_t* class_size) { 4795 size_t num_fields = 4796 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4797 4798 mirror::ObjectArray<mirror::ArtField>* fields = 4799 is_static ? klass->GetSFields() : klass->GetIFields(); 4800 4801 // Initialize field_offset 4802 MemberOffset field_offset(0); 4803 if (is_static) { 4804 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4805 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4806 // Static fields come after the embedded tables. 4807 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4808 0, 0, 0, 0, 0); 4809 } 4810 field_offset = MemberOffset(base); 4811 } else { 4812 mirror::Class* super_class = klass->GetSuperClass(); 4813 if (super_class != NULL) { 4814 CHECK(super_class->IsResolved()) 4815 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4816 field_offset = MemberOffset(super_class->GetObjectSize()); 4817 } 4818 } 4819 4820 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4821 4822 // we want a relatively stable order so that adding new fields 4823 // minimizes disruption of C++ version such as Class and Method. 4824 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4825 const char* old_no_suspend_cause = Thread::Current()->StartAssertNoThreadSuspension( 4826 "Naked ArtField references in deque"); 4827 for (size_t i = 0; i < num_fields; i++) { 4828 mirror::ArtField* f = fields->Get(i); 4829 CHECK(f != NULL) << PrettyClass(klass.Get()); 4830 grouped_and_sorted_fields.push_back(f); 4831 } 4832 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4833 LinkFieldsComparator()); 4834 4835 // References should be at the front. 4836 size_t current_field = 0; 4837 size_t num_reference_fields = 0; 4838 FieldGaps gaps; 4839 4840 for (; current_field < num_fields; current_field++) { 4841 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4842 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4843 bool isPrimitive = type != Primitive::kPrimNot; 4844 if (isPrimitive) { 4845 break; // past last reference, move on to the next phase 4846 } 4847 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 4848 MemberOffset old_offset = field_offset; 4849 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 4850 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 4851 } 4852 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 4853 grouped_and_sorted_fields.pop_front(); 4854 num_reference_fields++; 4855 fields->Set<false>(current_field, field); 4856 field->SetOffset(field_offset); 4857 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4858 } 4859 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 4860 // otherwise we could end up with suboptimal gap fills. 4861 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 4862 fields, &grouped_and_sorted_fields, &gaps); 4863 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 4864 fields, &grouped_and_sorted_fields, &gaps); 4865 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 4866 fields, &grouped_and_sorted_fields, &gaps); 4867 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 4868 fields, &grouped_and_sorted_fields, &gaps); 4869 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 4870 " fields."; 4871 4872 Thread::Current()->EndAssertNoThreadSuspension(old_no_suspend_cause); 4873 4874 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4875 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4876 // We know there are no non-reference fields in the Reference classes, and we know 4877 // that 'referent' is alphabetically last, so this is easy... 4878 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4879 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4880 --num_reference_fields; 4881 } 4882 4883 if (kIsDebugBuild) { 4884 // Make sure that all reference fields appear before 4885 // non-reference fields, and all double-wide fields are aligned. 4886 bool seen_non_ref = false; 4887 for (size_t i = 0; i < num_fields; i++) { 4888 mirror::ArtField* field = fields->Get(i); 4889 if (false) { // enable to debug field layout 4890 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4891 << " class=" << PrettyClass(klass.Get()) 4892 << " field=" << PrettyField(field) 4893 << " offset=" 4894 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4895 } 4896 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4897 bool is_primitive = type != Primitive::kPrimNot; 4898 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4899 strcmp("referent", field->GetName()) == 0) { 4900 is_primitive = true; // We lied above, so we have to expect a lie here. 4901 } 4902 if (is_primitive) { 4903 if (!seen_non_ref) { 4904 seen_non_ref = true; 4905 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4906 } 4907 } else { 4908 DCHECK(!seen_non_ref) << PrettyField(field); 4909 } 4910 } 4911 if (!seen_non_ref) { 4912 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4913 } 4914 } 4915 4916 size_t size = field_offset.Uint32Value(); 4917 // Update klass 4918 if (is_static) { 4919 klass->SetNumReferenceStaticFields(num_reference_fields); 4920 *class_size = size; 4921 } else { 4922 klass->SetNumReferenceInstanceFields(num_reference_fields); 4923 if (!klass->IsVariableSize()) { 4924 std::string temp; 4925 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4926 size_t previous_size = klass->GetObjectSize(); 4927 if (previous_size != 0) { 4928 // Make sure that we didn't originally have an incorrect size. 4929 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4930 } 4931 klass->SetObjectSize(size); 4932 } 4933 } 4934 return true; 4935} 4936 4937// Set the bitmap of reference offsets, refOffsets, from the ifields 4938// list. 4939void ClassLinker::CreateReferenceInstanceOffsets(ConstHandle<mirror::Class> klass) { 4940 uint32_t reference_offsets = 0; 4941 mirror::Class* super_class = klass->GetSuperClass(); 4942 if (super_class != NULL) { 4943 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4944 // If our superclass overflowed, we don't stand a chance. 4945 if (reference_offsets == CLASS_WALK_SUPER) { 4946 klass->SetReferenceInstanceOffsets(reference_offsets); 4947 return; 4948 } 4949 } 4950 CreateReferenceOffsets(klass, false, reference_offsets); 4951} 4952 4953void ClassLinker::CreateReferenceStaticOffsets(ConstHandle<mirror::Class> klass) { 4954 CreateReferenceOffsets(klass, true, 0); 4955} 4956 4957void ClassLinker::CreateReferenceOffsets(ConstHandle<mirror::Class> klass, bool is_static, 4958 uint32_t reference_offsets) { 4959 size_t num_reference_fields = 4960 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4961 : klass->NumReferenceInstanceFieldsDuringLinking(); 4962 mirror::ObjectArray<mirror::ArtField>* fields = 4963 is_static ? klass->GetSFields() : klass->GetIFields(); 4964 // All of the fields that contain object references are guaranteed 4965 // to be at the beginning of the fields list. 4966 for (size_t i = 0; i < num_reference_fields; ++i) { 4967 // Note that byte_offset is the offset from the beginning of 4968 // object, not the offset into instance data 4969 mirror::ArtField* field = fields->Get(i); 4970 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4971 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4972 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4973 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4974 CHECK_NE(new_bit, 0U); 4975 reference_offsets |= new_bit; 4976 } else { 4977 reference_offsets = CLASS_WALK_SUPER; 4978 break; 4979 } 4980 } 4981 // Update fields in klass 4982 if (is_static) { 4983 klass->SetReferenceStaticOffsets(reference_offsets); 4984 } else { 4985 klass->SetReferenceInstanceOffsets(reference_offsets); 4986 } 4987} 4988 4989mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4990 ConstHandle<mirror::DexCache> dex_cache) { 4991 DCHECK(dex_cache.Get() != nullptr); 4992 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4993 if (resolved != NULL) { 4994 return resolved; 4995 } 4996 uint32_t utf16_length; 4997 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4998 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4999 dex_cache->SetResolvedString(string_idx, string); 5000 return string; 5001} 5002 5003mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5004 mirror::Class* referrer) { 5005 StackHandleScope<2> hs(Thread::Current()); 5006 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5007 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5008 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5009} 5010 5011mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5012 ConstHandle<mirror::DexCache> dex_cache, 5013 ConstHandle<mirror::ClassLoader> class_loader) { 5014 DCHECK(dex_cache.Get() != NULL); 5015 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5016 if (resolved == NULL) { 5017 Thread* self = Thread::Current(); 5018 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5019 resolved = FindClass(self, descriptor, class_loader); 5020 if (resolved != NULL) { 5021 // TODO: we used to throw here if resolved's class loader was not the 5022 // boot class loader. This was to permit different classes with the 5023 // same name to be loaded simultaneously by different loaders 5024 dex_cache->SetResolvedType(type_idx, resolved); 5025 } else { 5026 CHECK(self->IsExceptionPending()) 5027 << "Expected pending exception for failed resolution of: " << descriptor; 5028 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5029 StackHandleScope<1> hs(self); 5030 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5031 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5032 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5033 self->ClearException(); 5034 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5035 self->GetException(NULL)->SetCause(cause.Get()); 5036 } 5037 } 5038 } 5039 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5040 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5041 return resolved; 5042} 5043 5044mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5045 ConstHandle<mirror::DexCache> dex_cache, 5046 ConstHandle<mirror::ClassLoader> class_loader, 5047 ConstHandle<mirror::ArtMethod> referrer, 5048 InvokeType type) { 5049 DCHECK(dex_cache.Get() != nullptr); 5050 // Check for hit in the dex cache. 5051 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5052 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5053 return resolved; 5054 } 5055 // Fail, get the declaring class. 5056 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5057 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5058 if (klass == nullptr) { 5059 DCHECK(Thread::Current()->IsExceptionPending()); 5060 return nullptr; 5061 } 5062 // Scan using method_idx, this saves string compares but will only hit for matching dex 5063 // caches/files. 5064 switch (type) { 5065 case kDirect: // Fall-through. 5066 case kStatic: 5067 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5068 break; 5069 case kInterface: 5070 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5071 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5072 break; 5073 case kSuper: // Fall-through. 5074 case kVirtual: 5075 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5076 break; 5077 default: 5078 LOG(FATAL) << "Unreachable - invocation type: " << type; 5079 } 5080 if (resolved == nullptr) { 5081 // Search by name, which works across dex files. 5082 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5083 const Signature signature = dex_file.GetMethodSignature(method_id); 5084 switch (type) { 5085 case kDirect: // Fall-through. 5086 case kStatic: 5087 resolved = klass->FindDirectMethod(name, signature); 5088 break; 5089 case kInterface: 5090 resolved = klass->FindInterfaceMethod(name, signature); 5091 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5092 break; 5093 case kSuper: // Fall-through. 5094 case kVirtual: 5095 resolved = klass->FindVirtualMethod(name, signature); 5096 break; 5097 } 5098 } 5099 // If we found a method, check for incompatible class changes. 5100 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5101 // Be a good citizen and update the dex cache to speed subsequent calls. 5102 dex_cache->SetResolvedMethod(method_idx, resolved); 5103 return resolved; 5104 } else { 5105 // If we had a method, it's an incompatible-class-change error. 5106 if (resolved != nullptr) { 5107 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5108 } else { 5109 // We failed to find the method which means either an access error, an incompatible class 5110 // change, or no such method. First try to find the method among direct and virtual methods. 5111 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5112 const Signature signature = dex_file.GetMethodSignature(method_id); 5113 switch (type) { 5114 case kDirect: 5115 case kStatic: 5116 resolved = klass->FindVirtualMethod(name, signature); 5117 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5118 // have had a resolved method before, which triggers the "true" branch above. 5119 break; 5120 case kInterface: 5121 case kVirtual: 5122 case kSuper: 5123 resolved = klass->FindDirectMethod(name, signature); 5124 break; 5125 } 5126 5127 // If we found something, check that it can be accessed by the referrer. 5128 if (resolved != nullptr && referrer.Get() != nullptr) { 5129 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5130 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5131 if (!referring_class->CanAccess(methods_class)) { 5132 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5133 resolved, type); 5134 return nullptr; 5135 } else if (!referring_class->CanAccessMember(methods_class, 5136 resolved->GetAccessFlags())) { 5137 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5138 return nullptr; 5139 } 5140 } 5141 5142 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5143 // methods and throw if we find the method there. If we find nothing, throw a 5144 // NoSuchMethodError. 5145 switch (type) { 5146 case kDirect: 5147 case kStatic: 5148 if (resolved != nullptr) { 5149 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5150 } else { 5151 resolved = klass->FindInterfaceMethod(name, signature); 5152 if (resolved != nullptr) { 5153 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5154 } else { 5155 ThrowNoSuchMethodError(type, klass, name, signature); 5156 } 5157 } 5158 break; 5159 case kInterface: 5160 if (resolved != nullptr) { 5161 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5162 } else { 5163 resolved = klass->FindVirtualMethod(name, signature); 5164 if (resolved != nullptr) { 5165 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5166 } else { 5167 ThrowNoSuchMethodError(type, klass, name, signature); 5168 } 5169 } 5170 break; 5171 case kSuper: 5172 if (resolved != nullptr) { 5173 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5174 } else { 5175 ThrowNoSuchMethodError(type, klass, name, signature); 5176 } 5177 break; 5178 case kVirtual: 5179 if (resolved != nullptr) { 5180 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5181 } else { 5182 resolved = klass->FindInterfaceMethod(name, signature); 5183 if (resolved != nullptr) { 5184 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5185 } else { 5186 ThrowNoSuchMethodError(type, klass, name, signature); 5187 } 5188 } 5189 break; 5190 } 5191 } 5192 DCHECK(Thread::Current()->IsExceptionPending()); 5193 return nullptr; 5194 } 5195} 5196 5197mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5198 ConstHandle<mirror::DexCache> dex_cache, 5199 ConstHandle<mirror::ClassLoader> class_loader, 5200 bool is_static) { 5201 DCHECK(dex_cache.Get() != nullptr); 5202 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5203 if (resolved != nullptr) { 5204 return resolved; 5205 } 5206 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5207 Thread* const self = Thread::Current(); 5208 StackHandleScope<1> hs(self); 5209 Handle<mirror::Class> klass( 5210 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5211 if (klass.Get() == nullptr) { 5212 DCHECK(Thread::Current()->IsExceptionPending()); 5213 return nullptr; 5214 } 5215 5216 if (is_static) { 5217 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5218 } else { 5219 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5220 } 5221 5222 if (resolved == nullptr) { 5223 const char* name = dex_file.GetFieldName(field_id); 5224 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5225 if (is_static) { 5226 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5227 } else { 5228 resolved = klass->FindInstanceField(name, type); 5229 } 5230 if (resolved == nullptr) { 5231 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5232 return NULL; 5233 } 5234 } 5235 dex_cache->SetResolvedField(field_idx, resolved); 5236 return resolved; 5237} 5238 5239mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5240 uint32_t field_idx, 5241 ConstHandle<mirror::DexCache> dex_cache, 5242 ConstHandle<mirror::ClassLoader> class_loader) { 5243 DCHECK(dex_cache.Get() != nullptr); 5244 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5245 if (resolved != nullptr) { 5246 return resolved; 5247 } 5248 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5249 Thread* self = Thread::Current(); 5250 StackHandleScope<1> hs(self); 5251 Handle<mirror::Class> klass( 5252 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5253 if (klass.Get() == NULL) { 5254 DCHECK(Thread::Current()->IsExceptionPending()); 5255 return NULL; 5256 } 5257 5258 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5259 StringPiece type(dex_file.StringDataByIdx( 5260 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5261 resolved = mirror::Class::FindField(self, klass, name, type); 5262 if (resolved != NULL) { 5263 dex_cache->SetResolvedField(field_idx, resolved); 5264 } else { 5265 ThrowNoSuchFieldError("", klass.Get(), type, name); 5266 } 5267 return resolved; 5268} 5269 5270const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5271 uint32_t* length) { 5272 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5273 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5274 const DexFile& dex_file = *dex_cache->GetDexFile(); 5275 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5276 return dex_file.GetMethodShorty(method_id, length); 5277} 5278 5279void ClassLinker::DumpAllClasses(int flags) { 5280 if (dex_cache_image_class_lookup_required_) { 5281 MoveImageClassesToClassTable(); 5282 } 5283 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5284 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5285 std::vector<mirror::Class*> all_classes; 5286 { 5287 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5288 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5289 mirror::Class* klass = it.second.Read(); 5290 all_classes.push_back(klass); 5291 } 5292 } 5293 5294 for (size_t i = 0; i < all_classes.size(); ++i) { 5295 all_classes[i]->DumpClass(std::cerr, flags); 5296 } 5297} 5298 5299void ClassLinker::DumpForSigQuit(std::ostream& os) { 5300 if (dex_cache_image_class_lookup_required_) { 5301 MoveImageClassesToClassTable(); 5302 } 5303 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5304 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5305} 5306 5307size_t ClassLinker::NumLoadedClasses() { 5308 if (dex_cache_image_class_lookup_required_) { 5309 MoveImageClassesToClassTable(); 5310 } 5311 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5312 return class_table_.size(); 5313} 5314 5315pid_t ClassLinker::GetClassesLockOwner() { 5316 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5317} 5318 5319pid_t ClassLinker::GetDexLockOwner() { 5320 return dex_lock_.GetExclusiveOwnerTid(); 5321} 5322 5323void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5324 DCHECK(!init_done_); 5325 5326 DCHECK(klass != NULL); 5327 DCHECK(klass->GetClassLoader() == NULL); 5328 5329 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5330 DCHECK(class_roots != NULL); 5331 DCHECK(class_roots->Get(class_root) == NULL); 5332 class_roots->Set<false>(class_root, klass); 5333} 5334 5335} // namespace art 5336