class_linker.cc revision 2ed8deff799448e094fa7a7cb9cf3b718820f4c6
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-inl.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 Runtime* runtime = Runtime::Current(); 93 bool is_compiler = runtime->IsCompiler(); 94 if (!is_compiler) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 if (is_compiler) { 101 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 102 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 103 self->SetException(ThrowLocation(), pre_allocated); 104 } else { 105 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 106 if (c->GetVerifyErrorClass() != NULL) { 107 // TODO: change the verifier to store an _instance_, with a useful detail message? 108 std::string temp; 109 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 110 PrettyDescriptor(c).c_str()); 111 } else { 112 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 113 PrettyDescriptor(c).c_str()); 114 } 115 } 116} 117 118static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 119 Thread* self = Thread::Current(); 120 JNIEnv* env = self->GetJniEnv(); 121 122 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 123 CHECK(cause.get() != nullptr); 124 125 env->ExceptionClear(); 126 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 127 env->Throw(cause.get()); 128 129 // We only wrap non-Error exceptions; an Error can just be used as-is. 130 if (!is_error) { 131 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 132 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 133 nullptr); 134 } 135} 136 137static size_t Hash(const char* s) { 138 // This is the java.lang.String hashcode for convenience, not interoperability. 139 size_t hash = 0; 140 for (; *s != '\0'; ++s) { 141 hash = hash * 31 + *s; 142 } 143 return hash; 144} 145 146// Gap between two fields in object layout. 147struct FieldGap { 148 uint32_t start_offset; // The offset from the start of the object. 149 uint32_t size; // The gap size of 1, 2, or 4 bytes. 150}; 151struct FieldGapsComparator { 152 explicit FieldGapsComparator() { 153 } 154 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 155 NO_THREAD_SAFETY_ANALYSIS { 156 // Sort by gap size, largest first. 157 return lhs.size > rhs.size; 158 } 159}; 160typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 161 162// Adds largest aligned gaps to queue of gaps. 163void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 164 DCHECK(gaps != nullptr); 165 166 uint32_t current_offset = gap_start; 167 while (current_offset != gap_end) { 168 size_t remaining = gap_end - current_offset; 169 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 170 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 171 current_offset += sizeof(uint32_t); 172 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 173 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 174 current_offset += sizeof(uint16_t); 175 } else { 176 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 177 current_offset += sizeof(uint8_t); 178 } 179 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 180 } 181} 182// Shuffle fields forward, making use of gaps whenever possible. 183template<int n> 184static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 185 MemberOffset* field_offset, 186 mirror::ObjectArray<mirror::ArtField>* fields, 187 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 188 FieldGaps* gaps) 189 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 190 DCHECK(current_field_idx != nullptr); 191 DCHECK(grouped_and_sorted_fields != nullptr); 192 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 193 DCHECK(gaps != nullptr); 194 DCHECK(field_offset != nullptr); 195 196 DCHECK(IsPowerOfTwo(n)); 197 while (!grouped_and_sorted_fields->empty()) { 198 mirror::ArtField* field = grouped_and_sorted_fields->front(); 199 Primitive::Type type = field->GetTypeAsPrimitiveType(); 200 if (Primitive::ComponentSize(type) < n) { 201 break; 202 } 203 if (!IsAligned<n>(field_offset->Uint32Value())) { 204 MemberOffset old_offset = *field_offset; 205 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 206 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 207 } 208 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 209 grouped_and_sorted_fields->pop_front(); 210 fields->Set<false>(*current_field_idx, field); 211 if (!gaps->empty() && gaps->top().size >= n) { 212 FieldGap gap = gaps->top(); 213 gaps->pop(); 214 DCHECK(IsAligned<n>(gap.start_offset)); 215 field->SetOffset(MemberOffset(gap.start_offset)); 216 if (gap.size > n) { 217 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 218 } 219 } else { 220 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 221 field->SetOffset(*field_offset); 222 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 223 } 224 ++(*current_field_idx); 225 } 226} 227 228const char* ClassLinker::class_roots_descriptors_[] = { 229 "Ljava/lang/Class;", 230 "Ljava/lang/Object;", 231 "[Ljava/lang/Class;", 232 "[Ljava/lang/Object;", 233 "Ljava/lang/String;", 234 "Ljava/lang/DexCache;", 235 "Ljava/lang/ref/Reference;", 236 "Ljava/lang/reflect/ArtField;", 237 "Ljava/lang/reflect/ArtMethod;", 238 "Ljava/lang/reflect/Proxy;", 239 "[Ljava/lang/String;", 240 "[Ljava/lang/reflect/ArtField;", 241 "[Ljava/lang/reflect/ArtMethod;", 242 "Ljava/lang/ClassLoader;", 243 "Ljava/lang/Throwable;", 244 "Ljava/lang/ClassNotFoundException;", 245 "Ljava/lang/StackTraceElement;", 246 "Z", 247 "B", 248 "C", 249 "D", 250 "F", 251 "I", 252 "J", 253 "S", 254 "V", 255 "[Z", 256 "[B", 257 "[C", 258 "[D", 259 "[F", 260 "[I", 261 "[J", 262 "[S", 263 "[Ljava/lang/StackTraceElement;", 264}; 265 266ClassLinker::ClassLinker(InternTable* intern_table) 267 // dex_lock_ is recursive as it may be used in stack dumping. 268 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 269 dex_cache_image_class_lookup_required_(false), 270 failed_dex_cache_class_lookups_(0), 271 class_roots_(nullptr), 272 array_iftable_(nullptr), 273 find_array_class_cache_next_victim_(0), 274 init_done_(false), 275 log_new_dex_caches_roots_(false), 276 log_new_class_table_roots_(false), 277 intern_table_(intern_table), 278 portable_resolution_trampoline_(nullptr), 279 quick_resolution_trampoline_(nullptr), 280 portable_imt_conflict_trampoline_(nullptr), 281 quick_imt_conflict_trampoline_(nullptr), 282 quick_generic_jni_trampoline_(nullptr), 283 quick_to_interpreter_bridge_trampoline_(nullptr) { 284 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 285 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 286} 287 288// To set a value for generic JNI. May be necessary in compiler tests. 289extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 290extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 291extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 292extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 293 294void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 295 VLOG(startup) << "ClassLinker::Init"; 296 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 297 298 CHECK(!init_done_); 299 300 // java_lang_Class comes first, it's needed for AllocClass 301 Thread* self = Thread::Current(); 302 gc::Heap* heap = Runtime::Current()->GetHeap(); 303 // The GC can't handle an object with a null class since we can't get the size of this object. 304 heap->IncrementDisableMovingGC(self); 305 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 306 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 307 heap->AllocNonMovableObject<true>(self, nullptr, 308 mirror::Class::ClassClassSize(), 309 VoidFunctor())))); 310 CHECK(java_lang_Class.Get() != nullptr); 311 mirror::Class::SetClassClass(java_lang_Class.Get()); 312 java_lang_Class->SetClass(java_lang_Class.Get()); 313 if (kUseBakerOrBrooksReadBarrier) { 314 java_lang_Class->AssertReadBarrierPointer(); 315 } 316 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 317 heap->DecrementDisableMovingGC(self); 318 // AllocClass(mirror::Class*) can now be used 319 320 // Class[] is used for reflection support. 321 Handle<mirror::Class> class_array_class(hs.NewHandle( 322 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 323 class_array_class->SetComponentType(java_lang_Class.Get()); 324 325 // java_lang_Object comes next so that object_array_class can be created. 326 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 328 CHECK(java_lang_Object.Get() != nullptr); 329 // backfill Object as the super class of Class. 330 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 331 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 332 333 // Object[] next to hold class roots. 334 Handle<mirror::Class> object_array_class(hs.NewHandle( 335 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 336 object_array_class->SetComponentType(java_lang_Object.Get()); 337 338 // Setup the char (primitive) class to be used for char[]. 339 Handle<mirror::Class> char_class(hs.NewHandle( 340 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 341 342 // Setup the char[] class to be used for String. 343 Handle<mirror::Class> char_array_class(hs.NewHandle( 344 AllocClass(self, java_lang_Class.Get(), 345 mirror::Array::ClassSize()))); 346 char_array_class->SetComponentType(char_class.Get()); 347 mirror::CharArray::SetArrayClass(char_array_class.Get()); 348 349 // Setup String. 350 Handle<mirror::Class> java_lang_String(hs.NewHandle( 351 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 352 mirror::String::SetClass(java_lang_String.Get()); 353 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 354 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 355 356 // Setup Reference. 357 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 358 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 359 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 360 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 361 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 362 363 // Create storage for root classes, save away our work so far (requires descriptors). 364 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 365 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 366 kClassRootsMax)); 367 CHECK(!class_roots_.IsNull()); 368 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 369 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 370 SetClassRoot(kClassArrayClass, class_array_class.Get()); 371 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 372 SetClassRoot(kCharArrayClass, char_array_class.Get()); 373 SetClassRoot(kJavaLangString, java_lang_String.Get()); 374 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 375 376 // Setup the primitive type classes. 377 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 378 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 379 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 380 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 381 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 382 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 383 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 384 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 385 386 // Create array interface entries to populate once we can load system classes. 387 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 388 389 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 390 Handle<mirror::Class> int_array_class(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 392 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 393 mirror::IntArray::SetArrayClass(int_array_class.Get()); 394 SetClassRoot(kIntArrayClass, int_array_class.Get()); 395 396 // now that these are registered, we can use AllocClass() and AllocObjectArray 397 398 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 399 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 400 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 401 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 402 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 403 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 404 405 // Constructor, Field, Method, and AbstractMethod are necessary so 406 // that FindClass can link members. 407 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 408 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 409 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 410 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 411 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 412 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 413 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 414 415 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 416 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 417 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 418 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 419 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 420 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 421 422 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 423 424 // Set up array classes for string, field, method 425 Handle<mirror::Class> object_array_string(hs.NewHandle( 426 AllocClass(self, java_lang_Class.Get(), 427 mirror::ObjectArray<mirror::String>::ClassSize()))); 428 object_array_string->SetComponentType(java_lang_String.Get()); 429 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 430 431 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 432 AllocClass(self, java_lang_Class.Get(), 433 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 434 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 435 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 436 437 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 438 AllocClass(self, java_lang_Class.Get(), 439 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 440 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 441 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 442 443 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 444 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 445 // these roots. 446 CHECK_NE(0U, boot_class_path.size()); 447 for (size_t i = 0; i != boot_class_path.size(); ++i) { 448 const DexFile* dex_file = boot_class_path[i]; 449 CHECK(dex_file != nullptr); 450 AppendToBootClassPath(self, *dex_file); 451 } 452 453 // now we can use FindSystemClass 454 455 // run char class through InitializePrimitiveClass to finish init 456 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 457 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 458 459 // Create runtime resolution and imt conflict methods. Also setup the default imt. 460 Runtime* runtime = Runtime::Current(); 461 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 462 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 463 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 464 465 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 466 // we do not need friend classes or a publicly exposed setter. 467 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 468 if (!runtime->IsCompiler()) { 469 // We need to set up the generic trampolines since we don't have an image. 470 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 471 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 472 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 473 } 474 475 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 476 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 477 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 478 CHECK_EQ(java_lang_Object.Get(), Object_class); 479 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 480 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 481 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 482 std::ostringstream os1, os2; 483 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 484 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 485 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 486 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 487 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 488 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 489 CHECK_EQ(java_lang_String.Get(), String_class); 490 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 491 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 492 493 // Setup the primitive array type classes - can't be done until Object has a vtable. 494 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 495 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 496 497 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 498 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 499 500 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 501 CHECK_EQ(char_array_class.Get(), found_char_array_class); 502 503 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 504 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 505 506 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 507 CHECK_EQ(int_array_class.Get(), found_int_array_class); 508 509 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 510 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 511 512 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 513 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 514 515 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 516 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 517 518 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 519 CHECK_EQ(class_array_class.Get(), found_class_array_class); 520 521 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 522 CHECK_EQ(object_array_class.Get(), found_object_array_class); 523 524 // Setup the single, global copy of "iftable". 525 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 526 CHECK(java_lang_Cloneable != nullptr); 527 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 528 CHECK(java_io_Serializable != nullptr); 529 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 530 // crawl up and explicitly list all of the supers as well. 531 { 532 mirror::IfTable* array_iftable = array_iftable_.Read(); 533 array_iftable->SetInterface(0, java_lang_Cloneable); 534 array_iftable->SetInterface(1, java_io_Serializable); 535 } 536 537 // Sanity check Class[] and Object[]'s interfaces. 538 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 539 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 540 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 541 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 542 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 543 // dex_cache_ fields and register them in class_table_. 544 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 545 CHECK_EQ(java_lang_Class.Get(), Class_class); 546 547 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 548 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 549 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 550 551 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 552 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 553 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 554 555 mirror::Class* String_array_class = 556 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 557 CHECK_EQ(object_array_string.Get(), String_array_class); 558 559 mirror::Class* Art_method_array_class = 560 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 561 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 562 563 mirror::Class* Art_field_array_class = 564 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 565 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 566 567 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 568 569 // Create java.lang.reflect.Proxy root. 570 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 571 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 572 573 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 574 // finish initializing Reference class 575 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 576 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 577 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 578 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 579 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 580 mirror::Class* java_lang_ref_FinalizerReference = 581 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 582 java_lang_ref_FinalizerReference->SetAccessFlags( 583 java_lang_ref_FinalizerReference->GetAccessFlags() | 584 kAccClassIsReference | kAccClassIsFinalizerReference); 585 mirror::Class* java_lang_ref_PhantomReference = 586 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 587 java_lang_ref_PhantomReference->SetAccessFlags( 588 java_lang_ref_PhantomReference->GetAccessFlags() | 589 kAccClassIsReference | kAccClassIsPhantomReference); 590 mirror::Class* java_lang_ref_SoftReference = 591 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 592 java_lang_ref_SoftReference->SetAccessFlags( 593 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 594 mirror::Class* java_lang_ref_WeakReference = 595 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 596 java_lang_ref_WeakReference->SetAccessFlags( 597 java_lang_ref_WeakReference->GetAccessFlags() | 598 kAccClassIsReference | kAccClassIsWeakReference); 599 600 // Setup the ClassLoader, verifying the object_size_. 601 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 602 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 603 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 604 605 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 606 // java.lang.StackTraceElement as a convenience. 607 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 608 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 609 SetClassRoot(kJavaLangClassNotFoundException, 610 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 611 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 612 SetClassRoot(kJavaLangStackTraceElementArrayClass, 613 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 614 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 615 616 FinishInit(self); 617 618 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 619} 620 621void ClassLinker::FinishInit(Thread* self) { 622 VLOG(startup) << "ClassLinker::FinishInit entering"; 623 624 // Let the heap know some key offsets into java.lang.ref instances 625 // Note: we hard code the field indexes here rather than using FindInstanceField 626 // as the types of the field can't be resolved prior to the runtime being 627 // fully initialized 628 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 629 mirror::Class* java_lang_ref_FinalizerReference = 630 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 631 632 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 633 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 634 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 635 636 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 637 CHECK_STREQ(queue->GetName(), "queue"); 638 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 639 640 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 641 CHECK_STREQ(queueNext->GetName(), "queueNext"); 642 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 643 644 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 645 CHECK_STREQ(referent->GetName(), "referent"); 646 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 647 648 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 649 CHECK_STREQ(zombie->GetName(), "zombie"); 650 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 651 652 // ensure all class_roots_ are initialized 653 for (size_t i = 0; i < kClassRootsMax; i++) { 654 ClassRoot class_root = static_cast<ClassRoot>(i); 655 mirror::Class* klass = GetClassRoot(class_root); 656 CHECK(klass != nullptr); 657 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 658 // note SetClassRoot does additional validation. 659 // if possible add new checks there to catch errors early 660 } 661 662 CHECK(!array_iftable_.IsNull()); 663 664 // disable the slow paths in FindClass and CreatePrimitiveClass now 665 // that Object, Class, and Object[] are setup 666 init_done_ = true; 667 668 VLOG(startup) << "ClassLinker::FinishInit exiting"; 669} 670 671void ClassLinker::RunRootClinits() { 672 Thread* self = Thread::Current(); 673 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 674 mirror::Class* c = GetClassRoot(ClassRoot(i)); 675 if (!c->IsArrayClass() && !c->IsPrimitive()) { 676 StackHandleScope<1> hs(self); 677 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 678 EnsureInitialized(self, h_class, true, true); 679 self->AssertNoPendingException(); 680 } 681 } 682} 683 684bool ClassLinker::GenerateOatFile(const char* dex_filename, 685 int oat_fd, 686 const char* oat_cache_filename, 687 std::string* error_msg) { 688 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 689 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 690 691 gc::Heap* heap = Runtime::Current()->GetHeap(); 692 std::string boot_image_option("--boot-image="); 693 if (heap->GetImageSpace() == nullptr) { 694 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 695 // out of space anyway it might not matter. 696 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 697 "without an image.", dex_filename); 698 return false; 699 } 700 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 701 702 std::string dex_file_option("--dex-file="); 703 dex_file_option += dex_filename; 704 705 std::string oat_fd_option("--oat-fd="); 706 StringAppendF(&oat_fd_option, "%d", oat_fd); 707 708 std::string oat_location_option("--oat-location="); 709 oat_location_option += oat_cache_filename; 710 711 std::vector<std::string> argv; 712 argv.push_back(dex2oat); 713 argv.push_back("--runtime-arg"); 714 argv.push_back("-classpath"); 715 argv.push_back("--runtime-arg"); 716 argv.push_back(Runtime::Current()->GetClassPathString()); 717 718 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 719 720 if (!Runtime::Current()->IsVerificationEnabled()) { 721 argv.push_back("--compiler-filter=verify-none"); 722 } 723 724 if (Runtime::Current()->MustRelocateIfPossible()) { 725 argv.push_back("--runtime-arg"); 726 argv.push_back("-Xrelocate"); 727 } else { 728 argv.push_back("--runtime-arg"); 729 argv.push_back("-Xnorelocate"); 730 } 731 732 if (!kIsTargetBuild) { 733 argv.push_back("--host"); 734 } 735 736 argv.push_back(boot_image_option); 737 argv.push_back(dex_file_option); 738 argv.push_back(oat_fd_option); 739 argv.push_back(oat_location_option); 740 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 741 for (size_t i = 0; i < compiler_options.size(); ++i) { 742 argv.push_back(compiler_options[i].c_str()); 743 } 744 745 return Exec(argv, error_msg); 746} 747 748const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 749 WriterMutexLock mu(Thread::Current(), dex_lock_); 750 if (kIsDebugBuild) { 751 for (size_t i = 0; i < oat_files_.size(); ++i) { 752 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 753 } 754 } 755 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 756 oat_files_.push_back(oat_file); 757 return oat_file; 758} 759 760OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 761 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 762 OatFile* oat_file = space->ReleaseOatFile(); 763 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 764 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 765 return *oat_file; 766} 767 768const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 769 const char* dex_location = dex_file.GetLocation().c_str(); 770 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 771 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 772} 773 774const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 775 const char* dex_location, 776 const uint32_t* dex_location_checksum) { 777 ReaderMutexLock mu(Thread::Current(), dex_lock_); 778 for (const OatFile* oat_file : oat_files_) { 779 DCHECK(oat_file != nullptr); 780 781 if (oat_location != nullptr) { 782 if (oat_file->GetLocation() != oat_location) { 783 continue; 784 } 785 } 786 787 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 788 dex_location_checksum, 789 false); 790 if (oat_dex_file != nullptr) { 791 return oat_dex_file; 792 } 793 } 794 return nullptr; 795} 796 797 798// Loads all multi dex files from the given oat file returning true on success. 799// 800// Parameters: 801// oat_file - the oat file to load from 802// dex_location - the dex location used to generate the oat file 803// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 804// generated - whether or not the oat_file existed before or was just (re)generated 805// error_msgs - any error messages will be appended here 806// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 807static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 808 const char* dex_location, 809 const uint32_t* dex_location_checksum, 810 bool generated, 811 std::vector<std::string>* error_msgs, 812 std::vector<const DexFile*>* dex_files) { 813 if (oat_file == nullptr) { 814 return false; 815 } 816 817 size_t old_size = dex_files->size(); // To rollback on error. 818 819 bool success = true; 820 for (size_t i = 0; success; ++i) { 821 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 822 const char* next_name = next_name_str.c_str(); 823 824 uint32_t next_location_checksum; 825 uint32_t* next_location_checksum_pointer = &next_location_checksum; 826 std::string error_msg; 827 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 828 // When i=0 the multidex name should be the same as the location name. We already have the 829 // checksum it so we don't need to recompute it. 830 if (dex_location_checksum == nullptr) { 831 next_location_checksum_pointer = nullptr; 832 } else { 833 next_location_checksum = *dex_location_checksum; 834 } 835 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 836 DCHECK_EQ(false, i == 0 && generated); 837 next_location_checksum_pointer = nullptr; 838 } 839 840 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 841 842 if (oat_dex_file == nullptr) { 843 if (i == 0 && generated) { 844 std::string error_msg; 845 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 846 " file'%s'", dex_location, next_location_checksum, 847 oat_file->GetLocation().c_str()); 848 error_msgs->push_back(error_msg); 849 } 850 break; // Not found, done. 851 } 852 853 // Checksum test. Test must succeed when generated. 854 success = !generated; 855 if (next_location_checksum_pointer != nullptr) { 856 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 857 } 858 859 if (success) { 860 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 861 if (dex_file == nullptr) { 862 success = false; 863 error_msgs->push_back(error_msg); 864 } else { 865 dex_files->push_back(dex_file); 866 } 867 } 868 869 // When we generated the file, we expect success, or something is terribly wrong. 870 CHECK_EQ(false, generated && !success) 871 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 872 << std::hex << " dex_location_checksum=" << next_location_checksum 873 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 874 } 875 876 if (dex_files->size() == old_size) { 877 success = false; // We did not even find classes.dex 878 } 879 880 if (success) { 881 return true; 882 } else { 883 // Free all the dex files we have loaded. 884 auto it = dex_files->begin() + old_size; 885 auto it_end = dex_files->end(); 886 for (; it != it_end; it++) { 887 delete *it; 888 } 889 dex_files->erase(dex_files->begin() + old_size, it_end); 890 891 return false; 892 } 893} 894 895// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 896// complicates the loading process, as we should not use an iterative loading process, because that 897// would register the oat file and dex files that come before the broken one. Instead, check all 898// multidex ahead of time. 899bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 900 std::vector<std::string>* error_msgs, 901 std::vector<const DexFile*>* dex_files) { 902 // 1) Check whether we have an open oat file. 903 // This requires a dex checksum, use the "primary" one. 904 uint32_t dex_location_checksum; 905 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 906 bool have_checksum = true; 907 std::string checksum_error_msg; 908 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 909 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 910 dex_location_checksum_pointer = nullptr; 911 have_checksum = false; 912 } 913 914 bool needs_registering = false; 915 916 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 917 dex_location_checksum_pointer); 918 std::unique_ptr<const OatFile> open_oat_file( 919 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 920 921 // 2) If we do not have an open one, maybe there's one on disk already. 922 923 // In case the oat file is not open, we play a locking game here so 924 // that if two different processes race to load and register or generate 925 // (or worse, one tries to open a partial generated file) we will be okay. 926 // This is actually common with apps that use DexClassLoader to work 927 // around the dex method reference limit and that have a background 928 // service running in a separate process. 929 ScopedFlock scoped_flock; 930 931 if (open_oat_file.get() == nullptr) { 932 if (oat_location != nullptr) { 933 // Can only do this if we have a checksum, else error. 934 if (!have_checksum) { 935 error_msgs->push_back(checksum_error_msg); 936 return false; 937 } 938 939 std::string error_msg; 940 941 // We are loading or creating one in the future. Time to set up the file lock. 942 if (!scoped_flock.Init(oat_location, &error_msg)) { 943 error_msgs->push_back(error_msg); 944 return false; 945 } 946 947 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 948 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 949 oat_location, &error_msg)); 950 951 if (open_oat_file.get() == nullptr) { 952 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 953 dex_location, oat_location, error_msg.c_str()); 954 VLOG(class_linker) << compound_msg; 955 error_msgs->push_back(compound_msg); 956 } 957 } else { 958 // TODO: What to lock here? 959 bool obsolete_file_cleanup_failed; 960 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 961 dex_location_checksum_pointer, 962 kRuntimeISA, error_msgs, 963 &obsolete_file_cleanup_failed)); 964 // There's no point in going forward and eventually try to regenerate the 965 // file if we couldn't remove the obsolete one. Mostly likely we will fail 966 // with the same error when trying to write the new file. 967 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 968 if (obsolete_file_cleanup_failed) { 969 return false; 970 } 971 } 972 needs_registering = true; 973 } 974 975 // 3) If we have an oat file, check all contained multidex files for our dex_location. 976 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 977 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 978 dex_location_checksum_pointer, 979 false, error_msgs, dex_files); 980 if (success) { 981 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 982 if (needs_registering) { 983 // We opened the oat file, so we must register it. 984 RegisterOatFile(oat_file); 985 } 986 // If the file isn't executable we failed patchoat but did manage to get the dex files. 987 return oat_file->IsExecutable(); 988 } else { 989 if (needs_registering) { 990 // We opened it, delete it. 991 open_oat_file.reset(); 992 } else { 993 open_oat_file.release(); // Do not delete open oat files. 994 } 995 } 996 997 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 998 999 // Need a checksum, fail else. 1000 if (!have_checksum) { 1001 error_msgs->push_back(checksum_error_msg); 1002 return false; 1003 } 1004 1005 // Look in cache location if no oat_location is given. 1006 std::string cache_location; 1007 if (oat_location == nullptr) { 1008 // Use the dalvik cache. 1009 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1010 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 1011 oat_location = cache_location.c_str(); 1012 } 1013 1014 bool has_flock = true; 1015 // Definitely need to lock now. 1016 if (!scoped_flock.HasFile()) { 1017 std::string error_msg; 1018 if (!scoped_flock.Init(oat_location, &error_msg)) { 1019 error_msgs->push_back(error_msg); 1020 has_flock = false; 1021 } 1022 } 1023 1024 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1025 // Create the oat file. 1026 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1027 oat_location, error_msgs)); 1028 } 1029 1030 // Failed, bail. 1031 if (open_oat_file.get() == nullptr) { 1032 std::string error_msg; 1033 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1034 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1035 error_msgs->push_back(error_msg); 1036 return false; 1037 } 1038 1039 // Try to load again, but stronger checks. 1040 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1041 dex_location_checksum_pointer, 1042 true, error_msgs, dex_files); 1043 if (success) { 1044 RegisterOatFile(open_oat_file.release()); 1045 return true; 1046 } else { 1047 return false; 1048 } 1049} 1050 1051const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1052 uint32_t dex_location_checksum, 1053 const char* oat_location, 1054 std::string* error_msg) { 1055 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1056 !Runtime::Current()->IsCompiler(), 1057 error_msg)); 1058 if (oat_file.get() == nullptr) { 1059 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1060 error_msg->c_str()); 1061 return nullptr; 1062 } 1063 Runtime* runtime = Runtime::Current(); 1064 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1065 if (image_space != nullptr) { 1066 const ImageHeader& image_header = image_space->GetImageHeader(); 1067 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1068 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1069 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1070 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1071 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1072 actual_image_oat_checksum); 1073 return nullptr; 1074 } 1075 1076 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1077 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1078 if (expected_image_oat_offset != actual_image_oat_offset) { 1079 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1080 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1081 actual_image_oat_offset); 1082 return nullptr; 1083 } 1084 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1085 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1086 if (expected_patch_delta != actual_patch_delta) { 1087 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1088 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1089 return nullptr; 1090 } 1091 } 1092 1093 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1094 &dex_location_checksum); 1095 if (oat_dex_file == nullptr) { 1096 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1097 dex_location); 1098 return nullptr; 1099 } 1100 uint32_t expected_dex_checksum = dex_location_checksum; 1101 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1102 if (expected_dex_checksum != actual_dex_checksum) { 1103 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1104 "found 0x%x", oat_location, expected_dex_checksum, 1105 actual_dex_checksum); 1106 return nullptr; 1107 } 1108 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1109 if (dex_file.get() != nullptr) { 1110 return oat_file.release(); 1111 } else { 1112 return nullptr; 1113 } 1114} 1115 1116const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1117 int fd, const char* oat_location, 1118 std::vector<std::string>* error_msgs) { 1119 // Generate the output oat file for the dex file 1120 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1121 std::string error_msg; 1122 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1123 CHECK(!error_msg.empty()); 1124 error_msgs->push_back(error_msg); 1125 return nullptr; 1126 } 1127 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1128 !Runtime::Current()->IsCompiler(), 1129 &error_msg)); 1130 if (oat_file.get() == nullptr) { 1131 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1132 oat_location, error_msg.c_str()); 1133 error_msgs->push_back(compound_msg); 1134 return nullptr; 1135 } 1136 1137 return oat_file.release(); 1138} 1139 1140bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1141 const InstructionSet instruction_set) { 1142 Runtime* runtime = Runtime::Current(); 1143 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1144 if (image_space == nullptr) { 1145 return false; 1146 } 1147 uint32_t image_oat_checksum = 0; 1148 if (instruction_set == kRuntimeISA) { 1149 const ImageHeader& image_header = image_space->GetImageHeader(); 1150 image_oat_checksum = image_header.GetOatChecksum(); 1151 } else { 1152 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1153 image_space->GetImageLocation().c_str(), instruction_set)); 1154 image_oat_checksum = image_header->GetOatChecksum(); 1155 } 1156 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1157} 1158 1159bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1160 const InstructionSet instruction_set, 1161 std::string* error_msg) { 1162 Runtime* runtime = Runtime::Current(); 1163 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1164 if (image_space == nullptr) { 1165 *error_msg = "No image space for verification against"; 1166 return false; 1167 } 1168 1169 // If the requested instruction set is the same as the current runtime, 1170 // we can use the checksums directly. If it isn't, we'll have to read the 1171 // image header from the image for the right instruction set. 1172 uint32_t image_oat_checksum = 0; 1173 uintptr_t image_oat_data_begin = 0; 1174 int32_t image_patch_delta = 0; 1175 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1176 const ImageHeader& image_header = image_space->GetImageHeader(); 1177 image_oat_checksum = image_header.GetOatChecksum(); 1178 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1179 image_patch_delta = image_header.GetPatchDelta(); 1180 } else { 1181 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1182 image_space->GetImageLocation().c_str(), instruction_set)); 1183 image_oat_checksum = image_header->GetOatChecksum(); 1184 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1185 image_patch_delta = image_header->GetPatchDelta(); 1186 } 1187 const OatHeader& oat_header = oat_file->GetOatHeader(); 1188 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1189 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1190 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1191 if (!ret) { 1192 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1193 oat_file->GetLocation().c_str(), 1194 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1195 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1196 oat_file->GetOatHeader().GetImagePatchDelta(), 1197 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1198 } 1199 return ret; 1200} 1201 1202bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1203 const char* dex_location, 1204 uint32_t dex_location_checksum, 1205 const InstructionSet instruction_set, 1206 std::string* error_msg) { 1207 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1208 return false; 1209 } 1210 1211 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1212 &dex_location_checksum); 1213 if (oat_dex_file == nullptr) { 1214 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1215 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1216 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1217 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1218 oat_file->GetLocation().c_str(), 1219 oat_dex_file->GetDexFileLocation().c_str(), 1220 oat_dex_file->GetDexFileLocationChecksum()); 1221 } 1222 return false; 1223 } 1224 1225 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1226 return true; 1227} 1228 1229bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1230 const char* dex_location, 1231 const uint32_t* dex_location_checksum, 1232 std::string* error_msg) { 1233 CHECK(oat_file != nullptr); 1234 CHECK(dex_location != nullptr); 1235 std::unique_ptr<const DexFile> dex_file; 1236 if (dex_location_checksum == nullptr) { 1237 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1238 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1239 // directory. 1240 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1241 if (oat_dex_file == nullptr) { 1242 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1243 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1244 error_msg->c_str()); 1245 return false; 1246 } 1247 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1248 } else { 1249 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1250 kRuntimeISA, error_msg); 1251 if (!verified) { 1252 return false; 1253 } 1254 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1255 dex_location_checksum)->OpenDexFile(error_msg)); 1256 } 1257 return dex_file.get() != nullptr; 1258} 1259 1260const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1261 const char* dex_location, 1262 const uint32_t* dex_location_checksum, 1263 InstructionSet isa, 1264 std::vector<std::string>* error_msgs, 1265 bool* obsolete_file_cleanup_failed) { 1266 *obsolete_file_cleanup_failed = false; 1267 bool already_opened = false; 1268 std::string dex_location_str(dex_location); 1269 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1270 &already_opened, 1271 obsolete_file_cleanup_failed, 1272 error_msgs)); 1273 std::string error_msg; 1274 if (oat_file.get() == nullptr) { 1275 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1276 dex_location)); 1277 return nullptr; 1278 } else if (oat_file->IsExecutable() && 1279 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1280 dex_location_checksum, &error_msg)) { 1281 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1282 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1283 error_msg.c_str())); 1284 return nullptr; 1285 } else if (!oat_file->IsExecutable() && 1286 Runtime::Current()->GetHeap()->HasImageSpace() && 1287 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1288 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1289 "dex location '%s'. Image checksum incorrect.", 1290 oat_file->GetLocation().c_str(), dex_location)); 1291 return nullptr; 1292 } else { 1293 return oat_file.release(); 1294 } 1295} 1296 1297const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1298 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1299 for (size_t i = 0; i < oat_files_.size(); i++) { 1300 const OatFile* oat_file = oat_files_[i]; 1301 DCHECK(oat_file != nullptr); 1302 if (oat_file->GetLocation() == oat_location) { 1303 return oat_file; 1304 } 1305 } 1306 return nullptr; 1307} 1308 1309const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1310 InstructionSet isa, 1311 bool *already_opened, 1312 bool *obsolete_file_cleanup_failed, 1313 std::vector<std::string>* error_msgs) { 1314 // Find out if we've already opened the file 1315 const OatFile* ret = nullptr; 1316 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1317 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1318 if (ret != nullptr) { 1319 *already_opened = true; 1320 return ret; 1321 } 1322 1323 std::string dalvik_cache; 1324 bool have_android_data = false; 1325 bool have_dalvik_cache = false; 1326 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1327 &have_android_data, &have_dalvik_cache); 1328 std::string cache_filename; 1329 if (have_dalvik_cache) { 1330 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1331 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1332 if (ret != nullptr) { 1333 *already_opened = true; 1334 return ret; 1335 } 1336 } else { 1337 // If we need to relocate we should just place odex back where it started. 1338 cache_filename = odex_filename; 1339 } 1340 1341 ret = nullptr; 1342 1343 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1344 // 1345 // Now we do the following: 1346 // 1) Try and open the odex version 1347 // 2) If present, checksum-verified & relocated correctly return it 1348 // 3) Close the odex version to free up its address space. 1349 // 4) Try and open the cache version 1350 // 5) If present, checksum-verified & relocated correctly return it 1351 // 6) Close the cache version to free up its address space. 1352 // 7) If we should relocate: 1353 // a) If we have opened and checksum-verified the odex version relocate it to 1354 // 'cache_filename' and return it 1355 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1356 // it. This should not happen often (I think only the run-test's will hit this case). 1357 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1358 // this point. 1359 // 9) Return nullptr 1360 1361 *already_opened = false; 1362 const Runtime* runtime = Runtime::Current(); 1363 CHECK(runtime != nullptr); 1364 bool executable = !runtime->IsCompiler(); 1365 1366 std::string odex_error_msg; 1367 bool should_patch_system = false; 1368 bool odex_checksum_verified = false; 1369 bool have_system_odex = false; 1370 { 1371 // There is a high probability that these both these oat files map similar/the same address 1372 // spaces so we must scope them like this so they each gets its turn. 1373 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1374 executable, &odex_error_msg)); 1375 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1376 &odex_checksum_verified, 1377 &odex_error_msg)) { 1378 return odex_oat_file.release(); 1379 } else { 1380 if (odex_checksum_verified) { 1381 // We can just relocate 1382 should_patch_system = true; 1383 odex_error_msg = "Image Patches are incorrect"; 1384 } 1385 if (odex_oat_file.get() != nullptr) { 1386 have_system_odex = true; 1387 } 1388 } 1389 } 1390 1391 std::string cache_error_msg; 1392 bool should_patch_cache = false; 1393 bool cache_checksum_verified = false; 1394 if (have_dalvik_cache) { 1395 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1396 executable, &cache_error_msg)); 1397 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1398 &cache_checksum_verified, 1399 &cache_error_msg)) { 1400 return cache_oat_file.release(); 1401 } else if (cache_checksum_verified) { 1402 // We can just relocate 1403 should_patch_cache = true; 1404 cache_error_msg = "Image Patches are incorrect"; 1405 } 1406 } else if (have_android_data) { 1407 // dalvik_cache does not exist but android data does. This means we should be able to create 1408 // it, so we should try. 1409 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1410 } 1411 1412 ret = nullptr; 1413 std::string error_msg; 1414 if (runtime->CanRelocate()) { 1415 // Run relocation 1416 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1417 if (space != nullptr) { 1418 const std::string& image_location = space->GetImageLocation(); 1419 if (odex_checksum_verified && should_patch_system) { 1420 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1421 } else if (cache_checksum_verified && should_patch_cache) { 1422 CHECK(have_dalvik_cache); 1423 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1424 } 1425 } else if (have_system_odex) { 1426 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1427 } 1428 } 1429 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1430 // implicitly: were able to fine where the cached version is but we were unable to use it, 1431 // either as a destination for relocation or to open a file. We should delete it if it is 1432 // there. 1433 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1434 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1435 "searching for dex file %s: %s", 1436 cache_filename.c_str(), dex_location.c_str(), 1437 strerror(errno)); 1438 error_msgs->push_back(rm_error_msg); 1439 VLOG(class_linker) << rm_error_msg; 1440 // Let the caller know that we couldn't remove the obsolete file. 1441 // This is a good indication that further writes may fail as well. 1442 *obsolete_file_cleanup_failed = true; 1443 } 1444 } 1445 if (ret == nullptr) { 1446 VLOG(class_linker) << error_msg; 1447 error_msgs->push_back(error_msg); 1448 std::string relocation_msg; 1449 if (runtime->CanRelocate()) { 1450 relocation_msg = StringPrintf(" and relocation failed"); 1451 } 1452 if (have_dalvik_cache && cache_checksum_verified) { 1453 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1454 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1455 cache_filename.c_str(), cache_error_msg.c_str(), 1456 relocation_msg.c_str()); 1457 } else { 1458 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1459 "dalvik_cache availible)%s.", odex_filename.c_str(), 1460 odex_error_msg.c_str(), relocation_msg.c_str()); 1461 } 1462 VLOG(class_linker) << error_msg; 1463 error_msgs->push_back(error_msg); 1464 } 1465 return ret; 1466} 1467 1468const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1469 InstructionSet isa, 1470 std::string* error_msg) { 1471 // We open it non-executable 1472 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1473 if (output.get() == nullptr) { 1474 return nullptr; 1475 } 1476 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1477 VerifyOatImageChecksum(output.get(), isa)) { 1478 return output.release(); 1479 } else { 1480 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1481 oat_path.c_str()); 1482 return nullptr; 1483 } 1484} 1485 1486const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1487 const std::string& output_oat, 1488 const std::string& image_location, 1489 InstructionSet isa, 1490 std::string* error_msg) { 1491 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1492 // We don't have an image space so there is no point in trying to patchoat. 1493 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1494 << "running without an image. Attempting to use oat file for interpretation."; 1495 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1496 } 1497 if (!Runtime::Current()->IsDex2OatEnabled()) { 1498 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1499 // input_oat but make sure we only do interpretation on it's dex files. 1500 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1501 << "disabled. Attempting to use oat file for interpretation"; 1502 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1503 } 1504 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1505 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1506 1507 std::string isa_arg("--instruction-set="); 1508 isa_arg += GetInstructionSetString(isa); 1509 std::string input_oat_filename_arg("--input-oat-file="); 1510 input_oat_filename_arg += input_oat; 1511 std::string output_oat_filename_arg("--output-oat-file="); 1512 output_oat_filename_arg += output_oat; 1513 std::string patched_image_arg("--patched-image-location="); 1514 patched_image_arg += image_location; 1515 1516 std::vector<std::string> argv; 1517 argv.push_back(patchoat); 1518 argv.push_back(isa_arg); 1519 argv.push_back(input_oat_filename_arg); 1520 argv.push_back(output_oat_filename_arg); 1521 argv.push_back(patched_image_arg); 1522 1523 std::string command_line(Join(argv, ' ')); 1524 LOG(INFO) << "Relocate Oat File: " << command_line; 1525 bool success = Exec(argv, error_msg); 1526 if (success) { 1527 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1528 !Runtime::Current()->IsCompiler(), error_msg)); 1529 bool checksum_verified = false; 1530 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1531 return output.release(); 1532 } else if (output.get() != nullptr) { 1533 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1534 "but output file '%s' failed verifcation: %s", 1535 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1536 } else { 1537 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1538 "but was unable to open output file '%s': %s", 1539 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1540 } 1541 } else if (!Runtime::Current()->IsCompiler()) { 1542 // patchoat failed which means we probably don't have enough room to place the output oat file, 1543 // instead of failing we should just run the interpreter from the dex files in the input oat. 1544 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1545 << "for interpretation. patchoat failure was: " << *error_msg; 1546 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1547 } else { 1548 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1549 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1550 error_msg->c_str()); 1551 } 1552 return nullptr; 1553} 1554 1555int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1556 Runtime* runtime = Runtime::Current(); 1557 int32_t real_patch_delta; 1558 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1559 CHECK(image_space != nullptr); 1560 if (isa == Runtime::Current()->GetInstructionSet()) { 1561 const ImageHeader& image_header = image_space->GetImageHeader(); 1562 real_patch_delta = image_header.GetPatchDelta(); 1563 } else { 1564 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1565 image_space->GetImageLocation().c_str(), isa)); 1566 real_patch_delta = image_header->GetPatchDelta(); 1567 } 1568 const OatHeader& oat_header = oat_file->GetOatHeader(); 1569 return real_patch_delta - oat_header.GetImagePatchDelta(); 1570} 1571 1572bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1573 bool* checksum_verified, 1574 std::string* error_msg) { 1575 Runtime* runtime = Runtime::Current(); 1576 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1577 if (image_space == nullptr) { 1578 *error_msg = "No image space present"; 1579 return false; 1580 } 1581 uint32_t real_image_checksum; 1582 void* real_image_oat_offset; 1583 int32_t real_patch_delta; 1584 if (isa == runtime->GetInstructionSet()) { 1585 const ImageHeader& image_header = image_space->GetImageHeader(); 1586 real_image_checksum = image_header.GetOatChecksum(); 1587 real_image_oat_offset = image_header.GetOatDataBegin(); 1588 real_patch_delta = image_header.GetPatchDelta(); 1589 } else { 1590 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1591 image_space->GetImageLocation().c_str(), isa)); 1592 real_image_checksum = image_header->GetOatChecksum(); 1593 real_image_oat_offset = image_header->GetOatDataBegin(); 1594 real_patch_delta = image_header->GetPatchDelta(); 1595 } 1596 1597 const OatHeader& oat_header = oat_file->GetOatHeader(); 1598 std::string compound_msg; 1599 1600 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1601 *checksum_verified = oat_image_checksum == real_image_checksum; 1602 if (!*checksum_verified) { 1603 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1604 real_image_checksum, oat_image_checksum); 1605 } 1606 1607 void* oat_image_oat_offset = 1608 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1609 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1610 if (!offset_verified) { 1611 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1612 real_image_oat_offset, oat_image_oat_offset); 1613 } 1614 1615 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1616 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1617 if (!patch_delta_verified) { 1618 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1619 real_patch_delta, oat_patch_delta); 1620 } 1621 1622 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1623 if (!ret) { 1624 *error_msg = "Oat file failed to verify:" + compound_msg; 1625 } 1626 return ret; 1627} 1628 1629const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1630 std::string* error_msg) { 1631 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1632 if (oat_file != nullptr) { 1633 return oat_file; 1634 } 1635 1636 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1637 error_msg); 1638} 1639 1640static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1641 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1642 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1643 1644 DCHECK(obj != nullptr); 1645 DCHECK(class_linker != nullptr); 1646 1647 if (obj->IsArtMethod()) { 1648 mirror::ArtMethod* method = obj->AsArtMethod(); 1649 if (!method->IsNative()) { 1650 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1651 if (method != Runtime::Current()->GetResolutionMethod()) { 1652 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1653 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1654 } 1655 } 1656 } 1657} 1658 1659void ClassLinker::InitFromImage() { 1660 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1661 CHECK(!init_done_); 1662 1663 Thread* self = Thread::Current(); 1664 gc::Heap* heap = Runtime::Current()->GetHeap(); 1665 gc::space::ImageSpace* space = heap->GetImageSpace(); 1666 dex_cache_image_class_lookup_required_ = true; 1667 CHECK(space != nullptr); 1668 OatFile& oat_file = GetImageOatFile(space); 1669 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1670 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1671 const char* image_file_location = oat_file.GetOatHeader(). 1672 GetStoreValueByKey(OatHeader::kImageLocationKey); 1673 CHECK(image_file_location == nullptr || *image_file_location == 0); 1674 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1675 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1676 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1677 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1678 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1679 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1680 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1681 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1682 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1683 1684 StackHandleScope<1> hs(self); 1685 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1686 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1687 AsObjectArray<mirror::Class>())); 1688 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1689 1690 // Special case of setting up the String class early so that we can test arbitrary objects 1691 // as being Strings or not 1692 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1693 1694 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1695 static_cast<uint32_t>(dex_caches->GetLength())); 1696 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1697 StackHandleScope<1> hs(self); 1698 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1699 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1700 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1701 nullptr); 1702 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1703 std::string error_msg; 1704 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1705 if (dex_file == nullptr) { 1706 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1707 << " from within oat file " << oat_file.GetLocation() 1708 << " error '" << error_msg << "'"; 1709 } 1710 1711 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1712 1713 AppendToBootClassPath(*dex_file, dex_cache); 1714 } 1715 1716 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1717 // bitmap walk. 1718 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1719 1720 // Set entry point to interpreter if in InterpretOnly mode. 1721 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1722 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1723 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1724 } 1725 1726 // reinit class_roots_ 1727 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1728 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1729 1730 // reinit array_iftable_ from any array class instance, they should be == 1731 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1732 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1733 // String class root was set above 1734 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1735 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1736 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1737 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1738 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1739 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1740 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1741 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1742 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1743 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1744 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1745 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1746 1747 FinishInit(self); 1748 1749 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1750} 1751 1752void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1753 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1754 if ((flags & kVisitRootFlagAllRoots) != 0) { 1755 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1756 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1757 } 1758 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1759 for (auto& pair : new_class_roots_) { 1760 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1761 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1762 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1763 if (UNLIKELY(new_ref != old_ref)) { 1764 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1765 // corresponding object. This is slow, but luckily for us, this may only happen with a 1766 // concurrent moving GC. 1767 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1768 it != end && it->first == pair.first; ++it) { 1769 // If the class stored matches the old class, update it to the new value. 1770 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1771 it->second = GcRoot<mirror::Class>(new_ref); 1772 } 1773 } 1774 } 1775 } 1776 } 1777 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1778 new_class_roots_.clear(); 1779 } 1780 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1781 log_new_class_table_roots_ = true; 1782 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1783 log_new_class_table_roots_ = false; 1784 } 1785 // We deliberately ignore the class roots in the image since we 1786 // handle image roots by using the MS/CMS rescanning of dirty cards. 1787} 1788 1789// Keep in sync with InitCallback. Anything we visit, we need to 1790// reinit references to when reinitializing a ClassLinker from a 1791// mapped image. 1792void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1793 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1794 Thread* self = Thread::Current(); 1795 { 1796 ReaderMutexLock mu(self, dex_lock_); 1797 if ((flags & kVisitRootFlagAllRoots) != 0) { 1798 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1799 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1800 } 1801 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1802 for (size_t index : new_dex_cache_roots_) { 1803 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1804 } 1805 } 1806 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1807 new_dex_cache_roots_.clear(); 1808 } 1809 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1810 log_new_dex_caches_roots_ = true; 1811 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1812 log_new_dex_caches_roots_ = false; 1813 } 1814 } 1815 VisitClassRoots(callback, arg, flags); 1816 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1817 DCHECK(!array_iftable_.IsNull()); 1818 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1819 if (!find_array_class_cache_[i].IsNull()) { 1820 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1821 } 1822 } 1823} 1824 1825void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1826 if (dex_cache_image_class_lookup_required_) { 1827 MoveImageClassesToClassTable(); 1828 } 1829 // TODO: why isn't this a ReaderMutexLock? 1830 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1831 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1832 mirror::Class* c = it.second.Read(); 1833 if (!visitor(c, arg)) { 1834 return; 1835 } 1836 } 1837} 1838 1839static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1840 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1841 classes->insert(c); 1842 return true; 1843} 1844 1845struct GetClassesVisitorArrayArg { 1846 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1847 int32_t index; 1848 bool success; 1849}; 1850 1851static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1852 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1853 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1854 if (arg->index < (*arg->classes)->GetLength()) { 1855 (*arg->classes)->Set(arg->index, c); 1856 arg->index++; 1857 return true; 1858 } else { 1859 arg->success = false; 1860 return false; 1861 } 1862} 1863 1864void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1865 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1866 // is avoiding duplicates. 1867 if (!kMovingClasses) { 1868 std::set<mirror::Class*> classes; 1869 VisitClasses(GetClassesVisitorSet, &classes); 1870 for (mirror::Class* klass : classes) { 1871 if (!visitor(klass, arg)) { 1872 return; 1873 } 1874 } 1875 } else { 1876 Thread* self = Thread::Current(); 1877 StackHandleScope<1> hs(self); 1878 Handle<mirror::ObjectArray<mirror::Class>> classes = 1879 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1880 GetClassesVisitorArrayArg local_arg; 1881 local_arg.classes = &classes; 1882 local_arg.success = false; 1883 // We size the array assuming classes won't be added to the class table during the visit. 1884 // If this assumption fails we iterate again. 1885 while (!local_arg.success) { 1886 size_t class_table_size; 1887 { 1888 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1889 class_table_size = class_table_.size(); 1890 } 1891 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1892 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1893 classes.Assign( 1894 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1895 CHECK(classes.Get() != nullptr); // OOME. 1896 local_arg.index = 0; 1897 local_arg.success = true; 1898 VisitClasses(GetClassesVisitorArray, &local_arg); 1899 } 1900 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1901 // If the class table shrank during creation of the clases array we expect null elements. If 1902 // the class table grew then the loop repeats. If classes are created after the loop has 1903 // finished then we don't visit. 1904 mirror::Class* klass = classes->Get(i); 1905 if (klass != nullptr && !visitor(klass, arg)) { 1906 return; 1907 } 1908 } 1909 } 1910} 1911 1912ClassLinker::~ClassLinker() { 1913 mirror::Class::ResetClass(); 1914 mirror::String::ResetClass(); 1915 mirror::Reference::ResetClass(); 1916 mirror::ArtField::ResetClass(); 1917 mirror::ArtMethod::ResetClass(); 1918 mirror::BooleanArray::ResetArrayClass(); 1919 mirror::ByteArray::ResetArrayClass(); 1920 mirror::CharArray::ResetArrayClass(); 1921 mirror::DoubleArray::ResetArrayClass(); 1922 mirror::FloatArray::ResetArrayClass(); 1923 mirror::IntArray::ResetArrayClass(); 1924 mirror::LongArray::ResetArrayClass(); 1925 mirror::ShortArray::ResetArrayClass(); 1926 mirror::Throwable::ResetClass(); 1927 mirror::StackTraceElement::ResetClass(); 1928 STLDeleteElements(&boot_class_path_); 1929 STLDeleteElements(&oat_files_); 1930} 1931 1932mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1933 gc::Heap* heap = Runtime::Current()->GetHeap(); 1934 StackHandleScope<16> hs(self); 1935 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1936 Handle<mirror::DexCache> dex_cache( 1937 hs.NewHandle(down_cast<mirror::DexCache*>( 1938 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1939 VoidFunctor())))); 1940 if (dex_cache.Get() == nullptr) { 1941 return nullptr; 1942 } 1943 Handle<mirror::String> 1944 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1945 if (location.Get() == nullptr) { 1946 return nullptr; 1947 } 1948 Handle<mirror::ObjectArray<mirror::String>> 1949 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1950 if (strings.Get() == nullptr) { 1951 return nullptr; 1952 } 1953 Handle<mirror::ObjectArray<mirror::Class>> 1954 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1955 if (types.Get() == nullptr) { 1956 return nullptr; 1957 } 1958 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1959 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1960 if (methods.Get() == nullptr) { 1961 return nullptr; 1962 } 1963 Handle<mirror::ObjectArray<mirror::ArtField>> 1964 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1965 if (fields.Get() == nullptr) { 1966 return nullptr; 1967 } 1968 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1969 fields.Get()); 1970 return dex_cache.Get(); 1971} 1972 1973mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1974 uint32_t class_size) { 1975 DCHECK_GE(class_size, sizeof(mirror::Class)); 1976 gc::Heap* heap = Runtime::Current()->GetHeap(); 1977 mirror::Class::InitializeClassVisitor visitor(class_size); 1978 mirror::Object* k = kMovingClasses ? 1979 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1980 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1981 if (UNLIKELY(k == nullptr)) { 1982 CHECK(self->IsExceptionPending()); // OOME. 1983 return nullptr; 1984 } 1985 return k->AsClass(); 1986} 1987 1988mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1989 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1990} 1991 1992mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1993 return down_cast<mirror::ArtField*>( 1994 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1995} 1996 1997mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1998 return down_cast<mirror::ArtMethod*>( 1999 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 2000} 2001 2002mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 2003 Thread* self, size_t length) { 2004 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 2005 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 2006} 2007 2008mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2009 mirror::Class* klass) { 2010 DCHECK(klass != nullptr); 2011 2012 // For temporary classes we must wait for them to be retired. 2013 if (init_done_ && klass->IsTemp()) { 2014 CHECK(!klass->IsResolved()); 2015 if (klass->IsErroneous()) { 2016 ThrowEarlierClassFailure(klass); 2017 return nullptr; 2018 } 2019 StackHandleScope<1> hs(self); 2020 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2021 ObjectLock<mirror::Class> lock(self, h_class); 2022 // Loop and wait for the resolving thread to retire this class. 2023 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2024 lock.WaitIgnoringInterrupts(); 2025 } 2026 if (h_class->IsErroneous()) { 2027 ThrowEarlierClassFailure(h_class.Get()); 2028 return nullptr; 2029 } 2030 CHECK(h_class->IsRetired()); 2031 // Get the updated class from class table. 2032 klass = LookupClass(self, descriptor, h_class.Get()->GetClassLoader()); 2033 } 2034 2035 // Wait for the class if it has not already been linked. 2036 if (!klass->IsResolved() && !klass->IsErroneous()) { 2037 StackHandleScope<1> hs(self); 2038 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2039 ObjectLock<mirror::Class> lock(self, h_class); 2040 // Check for circular dependencies between classes. 2041 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2042 ThrowClassCircularityError(h_class.Get()); 2043 h_class->SetStatus(mirror::Class::kStatusError, self); 2044 return nullptr; 2045 } 2046 // Wait for the pending initialization to complete. 2047 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2048 lock.WaitIgnoringInterrupts(); 2049 } 2050 } 2051 2052 if (klass->IsErroneous()) { 2053 ThrowEarlierClassFailure(klass); 2054 return nullptr; 2055 } 2056 // Return the loaded class. No exceptions should be pending. 2057 CHECK(klass->IsResolved()) << PrettyClass(klass); 2058 self->AssertNoPendingException(); 2059 return klass; 2060} 2061 2062typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2063 2064// Search a collection of DexFiles for a descriptor 2065ClassPathEntry FindInClassPath(const char* descriptor, 2066 const std::vector<const DexFile*>& class_path) { 2067 for (size_t i = 0; i != class_path.size(); ++i) { 2068 const DexFile* dex_file = class_path[i]; 2069 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2070 if (dex_class_def != nullptr) { 2071 return ClassPathEntry(dex_file, dex_class_def); 2072 } 2073 } 2074 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2075 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2076 static_cast<const DexFile::ClassDef*>(nullptr)); 2077} 2078 2079mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2080 Thread* self, const char* descriptor, 2081 ConstHandle<mirror::ClassLoader> class_loader) { 2082 if (class_loader->GetClass() != 2083 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2084 class_loader->GetParent()->GetClass() != 2085 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2086 return nullptr; 2087 } 2088 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2089 // Check if this would be found in the parent boot class loader. 2090 if (pair.second != nullptr) { 2091 mirror::Class* klass = LookupClass(self, descriptor, nullptr); 2092 if (klass != nullptr) { 2093 return EnsureResolved(self, descriptor, klass); 2094 } 2095 klass = DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2096 *pair.second); 2097 if (klass != nullptr) { 2098 return klass; 2099 } 2100 CHECK(self->IsExceptionPending()) << descriptor; 2101 self->ClearException(); 2102 } else { 2103 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2104 StackHandleScope<3> hs(self); 2105 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2106 // We need to get the DexPathList and loop through it. 2107 Handle<mirror::ArtField> cookie_field = 2108 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2109 Handle<mirror::ArtField> dex_file_field = 2110 hs.NewHandle( 2111 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2112 mirror::Object* dex_path_list = 2113 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2114 GetObject(class_loader.Get()); 2115 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2116 cookie_field.Get() != nullptr) { 2117 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2118 mirror::Object* dex_elements_obj = 2119 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2120 GetObject(dex_path_list); 2121 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2122 // at the mCookie which is a DexFile vector. 2123 if (dex_elements_obj != nullptr) { 2124 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2125 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2126 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2127 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2128 if (element == nullptr) { 2129 // Should never happen, fall back to java code to throw a NPE. 2130 break; 2131 } 2132 mirror::Object* dex_file = dex_file_field->GetObject(element); 2133 if (dex_file != nullptr) { 2134 const uint64_t cookie = cookie_field->GetLong(dex_file); 2135 auto* dex_files = 2136 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2137 if (dex_files == nullptr) { 2138 // This should never happen so log a warning. 2139 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2140 break; 2141 } 2142 for (const DexFile* dex_file : *dex_files) { 2143 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2144 if (dex_class_def != nullptr) { 2145 RegisterDexFile(*dex_file); 2146 mirror::Class* klass = 2147 DefineClass(self, descriptor, class_loader, *dex_file, *dex_class_def); 2148 if (klass == nullptr) { 2149 CHECK(self->IsExceptionPending()) << descriptor; 2150 self->ClearException(); 2151 return nullptr; 2152 } 2153 return klass; 2154 } 2155 } 2156 } 2157 } 2158 } 2159 } 2160 } 2161 return nullptr; 2162} 2163 2164mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2165 ConstHandle<mirror::ClassLoader> class_loader) { 2166 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2167 DCHECK(self != nullptr); 2168 self->AssertNoPendingException(); 2169 if (descriptor[1] == '\0') { 2170 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2171 // for primitive classes that aren't backed by dex files. 2172 return FindPrimitiveClass(descriptor[0]); 2173 } 2174 // Find the class in the loaded classes table. 2175 mirror::Class* klass = LookupClass(self, descriptor, class_loader.Get()); 2176 if (klass != nullptr) { 2177 return EnsureResolved(self, descriptor, klass); 2178 } 2179 // Class is not yet loaded. 2180 if (descriptor[0] == '[') { 2181 return CreateArrayClass(self, descriptor, class_loader); 2182 } else if (class_loader.Get() == nullptr) { 2183 // The boot class loader, search the boot class path. 2184 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2185 if (pair.second != nullptr) { 2186 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2187 *pair.second); 2188 } else { 2189 // The boot class loader is searched ahead of the application class loader, failures are 2190 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2191 // trigger the chaining with a proper stack trace. 2192 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2193 self->SetException(ThrowLocation(), pre_allocated); 2194 return nullptr; 2195 } 2196 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2197 // First try with the bootstrap class loader. 2198 if (class_loader.Get() != nullptr) { 2199 klass = LookupClass(self, descriptor, nullptr); 2200 if (klass != nullptr) { 2201 return EnsureResolved(self, descriptor, klass); 2202 } 2203 } 2204 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2205 // a NoClassDefFoundError being allocated. 2206 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2207 if (pair.second != nullptr) { 2208 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2209 *pair.second); 2210 } 2211 // Next try the compile time class path. 2212 const std::vector<const DexFile*>* class_path; 2213 { 2214 ScopedObjectAccessUnchecked soa(self); 2215 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2216 soa.AddLocalReference<jobject>(class_loader.Get())); 2217 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2218 } 2219 pair = FindInClassPath(descriptor, *class_path); 2220 if (pair.second != nullptr) { 2221 return DefineClass(self, descriptor, class_loader, *pair.first, *pair.second); 2222 } else { 2223 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2224 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2225 self->SetException(ThrowLocation(), pre_allocated); 2226 return nullptr; 2227 } 2228 } else { 2229 ScopedObjectAccessUnchecked soa(self); 2230 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2231 if (klass != nullptr) { 2232 return klass; 2233 } 2234 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2235 soa.AddLocalReference<jobject>(class_loader.Get())); 2236 std::string class_name_string(DescriptorToDot(descriptor)); 2237 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2238 { 2239 ScopedThreadStateChange tsc(self, kNative); 2240 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2241 soa.Env()->NewStringUTF(class_name_string.c_str())); 2242 if (class_name_object.get() == nullptr) { 2243 DCHECK(self->IsExceptionPending()); // OOME. 2244 return nullptr; 2245 } 2246 CHECK(class_loader_object.get() != nullptr); 2247 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2248 WellKnownClasses::java_lang_ClassLoader_loadClass, 2249 class_name_object.get())); 2250 } 2251 if (self->IsExceptionPending()) { 2252 // If the ClassLoader threw, pass that exception up. 2253 return nullptr; 2254 } else if (result.get() == nullptr) { 2255 // broken loader - throw NPE to be compatible with Dalvik 2256 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2257 class_name_string.c_str()).c_str()); 2258 return nullptr; 2259 } else { 2260 // success, return mirror::Class* 2261 return soa.Decode<mirror::Class*>(result.get()); 2262 } 2263 } 2264 2265 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2266 return nullptr; 2267} 2268 2269mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, 2270 ConstHandle<mirror::ClassLoader> class_loader, 2271 const DexFile& dex_file, 2272 const DexFile::ClassDef& dex_class_def) { 2273 StackHandleScope<3> hs(self); 2274 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2275 bool should_allocate = false; 2276 2277 // Load the class from the dex file. 2278 if (UNLIKELY(!init_done_)) { 2279 // finish up init of hand crafted class_roots_ 2280 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2281 klass.Assign(GetClassRoot(kJavaLangObject)); 2282 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2283 klass.Assign(GetClassRoot(kJavaLangClass)); 2284 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2285 klass.Assign(GetClassRoot(kJavaLangString)); 2286 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2287 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2288 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2289 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2290 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2291 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2292 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2293 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2294 } else { 2295 should_allocate = true; 2296 } 2297 } else { 2298 should_allocate = true; 2299 } 2300 2301 if (should_allocate) { 2302 // Allocate a class with the status of not ready. 2303 // Interface object should get the right size here. Regular class will 2304 // figure out the right size later and be replaced with one of the right 2305 // size when the class becomes resolved. 2306 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2307 } 2308 if (UNLIKELY(klass.Get() == nullptr)) { 2309 CHECK(self->IsExceptionPending()); // Expect an OOME. 2310 return nullptr; 2311 } 2312 klass->SetDexCache(FindDexCache(dex_file)); 2313 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2314 ObjectLock<mirror::Class> lock(self, klass); 2315 if (self->IsExceptionPending()) { 2316 // An exception occured during load, set status to erroneous while holding klass' lock in case 2317 // notification is necessary. 2318 if (!klass->IsErroneous()) { 2319 klass->SetStatus(mirror::Class::kStatusError, self); 2320 } 2321 return nullptr; 2322 } 2323 klass->SetClinitThreadId(self->GetTid()); 2324 2325 // Add the newly loaded class to the loaded classes table. 2326 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2327 if (existing != nullptr) { 2328 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2329 // this thread to block. 2330 return EnsureResolved(self, descriptor, existing); 2331 } 2332 2333 // Finish loading (if necessary) by finding parents 2334 CHECK(!klass->IsLoaded()); 2335 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2336 // Loading failed. 2337 if (!klass->IsErroneous()) { 2338 klass->SetStatus(mirror::Class::kStatusError, self); 2339 } 2340 return nullptr; 2341 } 2342 CHECK(klass->IsLoaded()); 2343 // Link the class (if necessary) 2344 CHECK(!klass->IsResolved()); 2345 // TODO: Use fast jobjects? 2346 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2347 2348 mirror::Class* new_class = nullptr; 2349 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2350 // Linking failed. 2351 if (!klass->IsErroneous()) { 2352 klass->SetStatus(mirror::Class::kStatusError, self); 2353 } 2354 return nullptr; 2355 } 2356 self->AssertNoPendingException(); 2357 CHECK(new_class != nullptr) << descriptor; 2358 CHECK(new_class->IsResolved()) << descriptor; 2359 2360 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2361 2362 /* 2363 * We send CLASS_PREPARE events to the debugger from here. The 2364 * definition of "preparation" is creating the static fields for a 2365 * class and initializing them to the standard default values, but not 2366 * executing any code (that comes later, during "initialization"). 2367 * 2368 * We did the static preparation in LinkClass. 2369 * 2370 * The class has been prepared and resolved but possibly not yet verified 2371 * at this point. 2372 */ 2373 Dbg::PostClassPrepare(new_class_h.Get()); 2374 2375 return new_class_h.Get(); 2376} 2377 2378uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2379 const DexFile::ClassDef& dex_class_def) { 2380 const byte* class_data = dex_file.GetClassData(dex_class_def); 2381 size_t num_ref = 0; 2382 size_t num_8 = 0; 2383 size_t num_16 = 0; 2384 size_t num_32 = 0; 2385 size_t num_64 = 0; 2386 if (class_data != nullptr) { 2387 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2388 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2389 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2390 char c = descriptor[0]; 2391 switch (c) { 2392 case 'L': 2393 case '[': 2394 num_ref++; 2395 break; 2396 case 'J': 2397 case 'D': 2398 num_64++; 2399 break; 2400 case 'I': 2401 case 'F': 2402 num_32++; 2403 break; 2404 case 'S': 2405 case 'C': 2406 num_16++; 2407 break; 2408 case 'B': 2409 case 'Z': 2410 num_8++; 2411 break; 2412 default: 2413 LOG(FATAL) << "Unknown descriptor: " << c; 2414 } 2415 } 2416 } 2417 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2418} 2419 2420OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2421 bool* found) { 2422 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2423 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2424 if (oat_dex_file == nullptr) { 2425 *found = false; 2426 return OatFile::OatClass::Invalid(); 2427 } 2428 *found = true; 2429 return oat_dex_file->GetOatClass(class_def_idx); 2430} 2431 2432static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2433 uint32_t method_idx) { 2434 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2435 const byte* class_data = dex_file.GetClassData(class_def); 2436 CHECK(class_data != nullptr); 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 // Process methods 2446 size_t class_def_method_index = 0; 2447 while (it.HasNextDirectMethod()) { 2448 if (it.GetMemberIndex() == method_idx) { 2449 return class_def_method_index; 2450 } 2451 class_def_method_index++; 2452 it.Next(); 2453 } 2454 while (it.HasNextVirtualMethod()) { 2455 if (it.GetMemberIndex() == method_idx) { 2456 return class_def_method_index; 2457 } 2458 class_def_method_index++; 2459 it.Next(); 2460 } 2461 DCHECK(!it.HasNext()); 2462 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2463 return 0; 2464} 2465 2466const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2467 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2468 // method for direct methods (or virtual methods made direct). 2469 mirror::Class* declaring_class = method->GetDeclaringClass(); 2470 size_t oat_method_index; 2471 if (method->IsStatic() || method->IsDirect()) { 2472 // Simple case where the oat method index was stashed at load time. 2473 oat_method_index = method->GetMethodIndex(); 2474 } else { 2475 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2476 // by search for its position in the declared virtual methods. 2477 oat_method_index = declaring_class->NumDirectMethods(); 2478 size_t end = declaring_class->NumVirtualMethods(); 2479 bool found = false; 2480 for (size_t i = 0; i < end; i++) { 2481 // Check method index instead of identity in case of duplicate method definitions. 2482 if (method->GetDexMethodIndex() == 2483 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2484 found = true; 2485 break; 2486 } 2487 oat_method_index++; 2488 } 2489 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2490 } 2491 DCHECK_EQ(oat_method_index, 2492 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2493 method->GetDeclaringClass()->GetDexClassDefIndex(), 2494 method->GetDexMethodIndex())); 2495 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2496 declaring_class->GetDexClassDefIndex(), 2497 found); 2498 if (!found) { 2499 return OatFile::OatMethod::Invalid(); 2500 } 2501 *found = true; 2502 return oat_class.GetOatMethod(oat_method_index); 2503} 2504 2505// Special case to get oat code without overwriting a trampoline. 2506const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2507 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2508 if (method->IsProxyMethod()) { 2509 return GetQuickProxyInvokeHandler(); 2510 } 2511 bool found; 2512 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2513 const void* result = nullptr; 2514 if (found) { 2515 result = oat_method.GetQuickCode(); 2516 } 2517 2518 if (result == nullptr) { 2519 if (method->IsNative()) { 2520 // No code and native? Use generic trampoline. 2521 result = GetQuickGenericJniTrampoline(); 2522 } else if (method->IsPortableCompiled()) { 2523 // No code? Do we expect portable code? 2524 result = GetQuickToPortableBridge(); 2525 } else { 2526 // No code? You must mean to go into the interpreter. 2527 result = GetQuickToInterpreterBridge(); 2528 } 2529 } 2530 return result; 2531} 2532 2533const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2534 bool* have_portable_code) { 2535 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2536 *have_portable_code = false; 2537 if (method->IsProxyMethod()) { 2538 return GetPortableProxyInvokeHandler(); 2539 } 2540 bool found; 2541 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2542 const void* result = nullptr; 2543 const void* quick_code = nullptr; 2544 if (found) { 2545 result = oat_method.GetPortableCode(); 2546 quick_code = oat_method.GetQuickCode(); 2547 } 2548 2549 if (result == nullptr) { 2550 if (quick_code == nullptr) { 2551 // No code? You must mean to go into the interpreter. 2552 result = GetPortableToInterpreterBridge(); 2553 } else { 2554 // No code? But there's quick code, so use a bridge. 2555 result = GetPortableToQuickBridge(); 2556 } 2557 } else { 2558 *have_portable_code = true; 2559 } 2560 return result; 2561} 2562 2563const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2564 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2565 return nullptr; 2566 } 2567 bool found; 2568 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2569 return found ? oat_method.GetQuickCode() : nullptr; 2570} 2571 2572const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2573 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2574 return nullptr; 2575 } 2576 bool found; 2577 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2578 return found ? oat_method.GetPortableCode() : nullptr; 2579} 2580 2581const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2582 uint32_t method_idx) { 2583 bool found; 2584 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2585 if (!found) { 2586 return nullptr; 2587 } 2588 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2589 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2590} 2591 2592const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2593 uint32_t method_idx) { 2594 bool found; 2595 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2596 if (!found) { 2597 return nullptr; 2598 } 2599 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2600 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2601} 2602 2603// Returns true if the method must run with interpreter, false otherwise. 2604static bool NeedsInterpreter( 2605 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2606 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2607 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2608 // No code: need interpreter. 2609 // May return true for native code, in the case of generic JNI 2610 // DCHECK(!method->IsNative()); 2611 return true; 2612 } 2613#ifdef ART_SEA_IR_MODE 2614 ScopedObjectAccess soa(Thread::Current()); 2615 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2616 LOG(INFO) << "Found " << PrettyMethod(method); 2617 return false; 2618 } 2619#endif 2620 // If interpreter mode is enabled, every method (except native and proxy) must 2621 // be run with interpreter. 2622 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2623 !method->IsNative() && !method->IsProxyMethod(); 2624} 2625 2626void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2627 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2628 if (klass->NumDirectMethods() == 0) { 2629 return; // No direct methods => no static methods. 2630 } 2631 Runtime* runtime = Runtime::Current(); 2632 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2633 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2634 return; // OAT file unavailable. 2635 } 2636 } 2637 2638 const DexFile& dex_file = klass->GetDexFile(); 2639 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2640 CHECK(dex_class_def != nullptr); 2641 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2642 // There should always be class data if there were direct methods. 2643 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2644 ClassDataItemIterator it(dex_file, class_data); 2645 // Skip fields 2646 while (it.HasNextStaticField()) { 2647 it.Next(); 2648 } 2649 while (it.HasNextInstanceField()) { 2650 it.Next(); 2651 } 2652 bool has_oat_class; 2653 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2654 &has_oat_class); 2655 // Link the code of methods skipped by LinkCode. 2656 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2657 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2658 if (!method->IsStatic()) { 2659 // Only update static methods. 2660 continue; 2661 } 2662 const void* portable_code = nullptr; 2663 const void* quick_code = nullptr; 2664 if (has_oat_class) { 2665 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2666 portable_code = oat_method.GetPortableCode(); 2667 quick_code = oat_method.GetQuickCode(); 2668 } 2669 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2670 bool have_portable_code = false; 2671 if (enter_interpreter) { 2672 // Use interpreter entry point. 2673 // Check whether the method is native, in which case it's generic JNI. 2674 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2675 quick_code = GetQuickGenericJniTrampoline(); 2676 portable_code = GetPortableToQuickBridge(); 2677 } else { 2678 portable_code = GetPortableToInterpreterBridge(); 2679 quick_code = GetQuickToInterpreterBridge(); 2680 } 2681 } else { 2682 if (portable_code == nullptr) { 2683 portable_code = GetPortableToQuickBridge(); 2684 } else { 2685 have_portable_code = true; 2686 } 2687 if (quick_code == nullptr) { 2688 quick_code = GetQuickToPortableBridge(); 2689 } 2690 } 2691 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2692 have_portable_code); 2693 } 2694 // Ignore virtual methods on the iterator. 2695} 2696 2697void ClassLinker::LinkCode(ConstHandle<mirror::ArtMethod> method, 2698 const OatFile::OatClass* oat_class, 2699 const DexFile& dex_file, uint32_t dex_method_index, 2700 uint32_t method_index) { 2701 if (Runtime::Current()->IsCompiler()) { 2702 // The following code only applies to a non-compiler runtime. 2703 return; 2704 } 2705 // Method shouldn't have already been linked. 2706 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2707 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2708 if (oat_class != nullptr) { 2709 // Every kind of method should at least get an invoke stub from the oat_method. 2710 // non-abstract methods also get their code pointers. 2711 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2712 oat_method.LinkMethod(method.Get()); 2713 } 2714 2715 // Install entry point from interpreter. 2716 bool enter_interpreter = NeedsInterpreter(method.Get(), 2717 method->GetEntryPointFromQuickCompiledCode(), 2718 method->GetEntryPointFromPortableCompiledCode()); 2719 if (enter_interpreter && !method->IsNative()) { 2720 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2721 } else { 2722 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2723 } 2724 2725 if (method->IsAbstract()) { 2726 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2727 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2728 return; 2729 } 2730 2731 bool have_portable_code = false; 2732 if (method->IsStatic() && !method->IsConstructor()) { 2733 // For static methods excluding the class initializer, install the trampoline. 2734 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2735 // after initializing class (see ClassLinker::InitializeClass method). 2736 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2737 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2738 } else if (enter_interpreter) { 2739 if (!method->IsNative()) { 2740 // Set entry point from compiled code if there's no code or in interpreter only mode. 2741 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2742 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2743 } else { 2744 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2745 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2746 } 2747 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2748 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2749 have_portable_code = true; 2750 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2751 } else { 2752 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2753 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2754 } 2755 2756 if (method->IsNative()) { 2757 // Unregistering restores the dlsym lookup stub. 2758 method->UnregisterNative(Thread::Current()); 2759 2760 if (enter_interpreter) { 2761 // We have a native method here without code. Then it should have either the GenericJni 2762 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2763 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2764 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2765 } 2766 } 2767 2768 // Allow instrumentation its chance to hijack code. 2769 Runtime* runtime = Runtime::Current(); 2770 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2771 method->GetEntryPointFromQuickCompiledCode(), 2772 method->GetEntryPointFromPortableCompiledCode(), 2773 have_portable_code); 2774} 2775 2776 2777 2778void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2779 const DexFile::ClassDef& dex_class_def, 2780 ConstHandle<mirror::Class> klass, 2781 mirror::ClassLoader* class_loader) { 2782 CHECK(klass.Get() != nullptr); 2783 CHECK(klass->GetDexCache() != nullptr); 2784 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2785 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2786 CHECK(descriptor != nullptr); 2787 2788 klass->SetClass(GetClassRoot(kJavaLangClass)); 2789 if (kUseBakerOrBrooksReadBarrier) { 2790 klass->AssertReadBarrierPointer(); 2791 } 2792 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2793 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2794 klass->SetAccessFlags(access_flags); 2795 klass->SetClassLoader(class_loader); 2796 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2797 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2798 2799 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2800 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2801 2802 const byte* class_data = dex_file.GetClassData(dex_class_def); 2803 if (class_data == nullptr) { 2804 return; // no fields or methods - for example a marker interface 2805 } 2806 2807 2808 bool has_oat_class = false; 2809 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2810 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2811 &has_oat_class); 2812 if (has_oat_class) { 2813 LoadClassMembers(self, dex_file, class_data, klass, class_loader, &oat_class); 2814 } 2815 } 2816 if (!has_oat_class) { 2817 LoadClassMembers(self, dex_file, class_data, klass, class_loader, nullptr); 2818 } 2819} 2820 2821void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2822 const byte* class_data, 2823 ConstHandle<mirror::Class> klass, 2824 mirror::ClassLoader* class_loader, 2825 const OatFile::OatClass* oat_class) { 2826 // Load fields. 2827 ClassDataItemIterator it(dex_file, class_data); 2828 if (it.NumStaticFields() != 0) { 2829 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2830 if (UNLIKELY(statics == nullptr)) { 2831 CHECK(self->IsExceptionPending()); // OOME. 2832 return; 2833 } 2834 klass->SetSFields(statics); 2835 } 2836 if (it.NumInstanceFields() != 0) { 2837 mirror::ObjectArray<mirror::ArtField>* fields = 2838 AllocArtFieldArray(self, it.NumInstanceFields()); 2839 if (UNLIKELY(fields == nullptr)) { 2840 CHECK(self->IsExceptionPending()); // OOME. 2841 return; 2842 } 2843 klass->SetIFields(fields); 2844 } 2845 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2846 self->AllowThreadSuspension(); 2847 StackHandleScope<1> hs(self); 2848 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2849 if (UNLIKELY(sfield.Get() == nullptr)) { 2850 CHECK(self->IsExceptionPending()); // OOME. 2851 return; 2852 } 2853 klass->SetStaticField(i, sfield.Get()); 2854 LoadField(dex_file, it, klass, sfield); 2855 } 2856 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2857 self->AllowThreadSuspension(); 2858 StackHandleScope<1> hs(self); 2859 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2860 if (UNLIKELY(ifield.Get() == nullptr)) { 2861 CHECK(self->IsExceptionPending()); // OOME. 2862 return; 2863 } 2864 klass->SetInstanceField(i, ifield.Get()); 2865 LoadField(dex_file, it, klass, ifield); 2866 } 2867 2868 // Load methods. 2869 if (it.NumDirectMethods() != 0) { 2870 // TODO: append direct methods to class object 2871 mirror::ObjectArray<mirror::ArtMethod>* directs = 2872 AllocArtMethodArray(self, it.NumDirectMethods()); 2873 if (UNLIKELY(directs == nullptr)) { 2874 CHECK(self->IsExceptionPending()); // OOME. 2875 return; 2876 } 2877 klass->SetDirectMethods(directs); 2878 } 2879 if (it.NumVirtualMethods() != 0) { 2880 // TODO: append direct methods to class object 2881 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2882 AllocArtMethodArray(self, it.NumVirtualMethods()); 2883 if (UNLIKELY(virtuals == nullptr)) { 2884 CHECK(self->IsExceptionPending()); // OOME. 2885 return; 2886 } 2887 klass->SetVirtualMethods(virtuals); 2888 } 2889 size_t class_def_method_index = 0; 2890 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2891 size_t last_class_def_method_index = 0; 2892 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2893 self->AllowThreadSuspension(); 2894 StackHandleScope<1> hs(self); 2895 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2896 if (UNLIKELY(method.Get() == nullptr)) { 2897 CHECK(self->IsExceptionPending()); // OOME. 2898 return; 2899 } 2900 klass->SetDirectMethod(i, method.Get()); 2901 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2902 uint32_t it_method_index = it.GetMemberIndex(); 2903 if (last_dex_method_index == it_method_index) { 2904 // duplicate case 2905 method->SetMethodIndex(last_class_def_method_index); 2906 } else { 2907 method->SetMethodIndex(class_def_method_index); 2908 last_dex_method_index = it_method_index; 2909 last_class_def_method_index = class_def_method_index; 2910 } 2911 class_def_method_index++; 2912 } 2913 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2914 self->AllowThreadSuspension(); 2915 StackHandleScope<1> hs(self); 2916 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2917 if (UNLIKELY(method.Get() == nullptr)) { 2918 CHECK(self->IsExceptionPending()); // OOME. 2919 return; 2920 } 2921 klass->SetVirtualMethod(i, method.Get()); 2922 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2923 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2924 class_def_method_index++; 2925 } 2926 DCHECK(!it.HasNext()); 2927} 2928 2929void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2930 ConstHandle<mirror::Class> klass, 2931 ConstHandle<mirror::ArtField> dst) { 2932 uint32_t field_idx = it.GetMemberIndex(); 2933 dst->SetDexFieldIndex(field_idx); 2934 dst->SetDeclaringClass(klass.Get()); 2935 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2936} 2937 2938mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2939 const ClassDataItemIterator& it, 2940 ConstHandle<mirror::Class> klass) { 2941 uint32_t dex_method_idx = it.GetMemberIndex(); 2942 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2943 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2944 2945 mirror::ArtMethod* dst = AllocArtMethod(self); 2946 if (UNLIKELY(dst == nullptr)) { 2947 CHECK(self->IsExceptionPending()); // OOME. 2948 return nullptr; 2949 } 2950 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2951 2952 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2953 dst->SetDexMethodIndex(dex_method_idx); 2954 dst->SetDeclaringClass(klass.Get()); 2955 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2956 2957 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2958 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2959 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2960 2961 uint32_t access_flags = it.GetMethodAccessFlags(); 2962 2963 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2964 // Set finalizable flag on declaring class. 2965 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2966 // Void return type. 2967 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2968 klass->SetFinalizable(); 2969 } else { 2970 std::string temp; 2971 const char* klass_descriptor = klass->GetDescriptor(&temp); 2972 // The Enum class declares a "final" finalize() method to prevent subclasses from 2973 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2974 // subclasses, so we exclude it here. 2975 // We also want to avoid setting the flag on Object, where we know that finalize() is 2976 // empty. 2977 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2978 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2979 klass->SetFinalizable(); 2980 } 2981 } 2982 } 2983 } else if (method_name[0] == '<') { 2984 // Fix broken access flags for initializers. Bug 11157540. 2985 bool is_init = (strcmp("<init>", method_name) == 0); 2986 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2987 if (UNLIKELY(!is_init && !is_clinit)) { 2988 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2989 } else { 2990 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2991 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2992 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2993 access_flags |= kAccConstructor; 2994 } 2995 } 2996 } 2997 dst->SetAccessFlags(access_flags); 2998 2999 self->EndAssertNoThreadSuspension(old_cause); 3000 return dst; 3001} 3002 3003void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 3004 StackHandleScope<1> hs(self); 3005 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3006 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3007 << dex_file.GetLocation(); 3008 AppendToBootClassPath(dex_file, dex_cache); 3009} 3010 3011void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 3012 ConstHandle<mirror::DexCache> dex_cache) { 3013 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3014 boot_class_path_.push_back(&dex_file); 3015 RegisterDexFile(dex_file, dex_cache); 3016} 3017 3018bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 3019 dex_lock_.AssertSharedHeld(Thread::Current()); 3020 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3021 mirror::DexCache* dex_cache = GetDexCache(i); 3022 if (dex_cache->GetDexFile() == &dex_file) { 3023 return true; 3024 } 3025 } 3026 return false; 3027} 3028 3029bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3030 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3031 return IsDexFileRegisteredLocked(dex_file); 3032} 3033 3034void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3035 ConstHandle<mirror::DexCache> dex_cache) { 3036 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3037 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3038 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3039 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3040 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3041 dex_cache->SetDexFile(&dex_file); 3042 if (log_new_dex_caches_roots_) { 3043 // TODO: This is not safe if we can remove dex caches. 3044 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3045 } 3046} 3047 3048void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3049 Thread* self = Thread::Current(); 3050 { 3051 ReaderMutexLock mu(self, dex_lock_); 3052 if (IsDexFileRegisteredLocked(dex_file)) { 3053 return; 3054 } 3055 } 3056 // Don't alloc while holding the lock, since allocation may need to 3057 // suspend all threads and another thread may need the dex_lock_ to 3058 // get to a suspend point. 3059 StackHandleScope<1> hs(self); 3060 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3061 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3062 << dex_file.GetLocation(); 3063 { 3064 WriterMutexLock mu(self, dex_lock_); 3065 if (IsDexFileRegisteredLocked(dex_file)) { 3066 return; 3067 } 3068 RegisterDexFileLocked(dex_file, dex_cache); 3069 } 3070} 3071 3072void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3073 ConstHandle<mirror::DexCache> dex_cache) { 3074 WriterMutexLock mu(Thread::Current(), dex_lock_); 3075 RegisterDexFileLocked(dex_file, dex_cache); 3076} 3077 3078mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3079 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3080 // Search assuming unique-ness of dex file. 3081 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3082 mirror::DexCache* dex_cache = GetDexCache(i); 3083 if (dex_cache->GetDexFile() == &dex_file) { 3084 return dex_cache; 3085 } 3086 } 3087 // Search matching by location name. 3088 std::string location(dex_file.GetLocation()); 3089 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3090 mirror::DexCache* dex_cache = GetDexCache(i); 3091 if (dex_cache->GetDexFile()->GetLocation() == location) { 3092 return dex_cache; 3093 } 3094 } 3095 // Failure, dump diagnostic and abort. 3096 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3097 mirror::DexCache* dex_cache = GetDexCache(i); 3098 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3099 } 3100 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3101 return nullptr; 3102} 3103 3104void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3105 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3106 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3107 mirror::DexCache* dex_cache = GetDexCache(i); 3108 dex_cache->Fixup(resolution_method); 3109 } 3110} 3111 3112mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3113 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3114 if (UNLIKELY(klass == nullptr)) { 3115 return nullptr; 3116 } 3117 return InitializePrimitiveClass(klass, type); 3118} 3119 3120mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3121 Primitive::Type type) { 3122 CHECK(primitive_class != nullptr); 3123 // Must hold lock on object when initializing. 3124 Thread* self = Thread::Current(); 3125 StackHandleScope<1> hs(self); 3126 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3127 ObjectLock<mirror::Class> lock(self, h_class); 3128 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3129 primitive_class->SetPrimitiveType(type); 3130 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3131 const char* descriptor = Primitive::Descriptor(type); 3132 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3133 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3134 return primitive_class; 3135} 3136 3137// Create an array class (i.e. the class object for the array, not the 3138// array itself). "descriptor" looks like "[C" or "[[[[B" or 3139// "[Ljava/lang/String;". 3140// 3141// If "descriptor" refers to an array of primitives, look up the 3142// primitive type's internally-generated class object. 3143// 3144// "class_loader" is the class loader of the class that's referring to 3145// us. It's used to ensure that we're looking for the element type in 3146// the right context. It does NOT become the class loader for the 3147// array class; that always comes from the base element class. 3148// 3149// Returns nullptr with an exception raised on failure. 3150mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3151 ConstHandle<mirror::ClassLoader> class_loader) { 3152 // Identify the underlying component type 3153 CHECK_EQ('[', descriptor[0]); 3154 StackHandleScope<2> hs(self); 3155 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3156 if (component_type.Get() == nullptr) { 3157 DCHECK(self->IsExceptionPending()); 3158 // We need to accept erroneous classes as component types. 3159 component_type.Assign(LookupClass(self, descriptor + 1, class_loader.Get())); 3160 if (component_type.Get() == nullptr) { 3161 DCHECK(self->IsExceptionPending()); 3162 return nullptr; 3163 } else { 3164 self->ClearException(); 3165 } 3166 } 3167 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3168 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3169 return nullptr; 3170 } 3171 // See if the component type is already loaded. Array classes are 3172 // always associated with the class loader of their underlying 3173 // element type -- an array of Strings goes with the loader for 3174 // java/lang/String -- so we need to look for it there. (The 3175 // caller should have checked for the existence of the class 3176 // before calling here, but they did so with *their* class loader, 3177 // not the component type's loader.) 3178 // 3179 // If we find it, the caller adds "loader" to the class' initiating 3180 // loader list, which should prevent us from going through this again. 3181 // 3182 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3183 // are the same, because our caller (FindClass) just did the 3184 // lookup. (Even if we get this wrong we still have correct behavior, 3185 // because we effectively do this lookup again when we add the new 3186 // class to the hash table --- necessary because of possible races with 3187 // other threads.) 3188 if (class_loader.Get() != component_type->GetClassLoader()) { 3189 mirror::Class* new_class = LookupClass(self, descriptor, component_type->GetClassLoader()); 3190 if (new_class != nullptr) { 3191 return new_class; 3192 } 3193 } 3194 3195 // Fill out the fields in the Class. 3196 // 3197 // It is possible to execute some methods against arrays, because 3198 // all arrays are subclasses of java_lang_Object_, so we need to set 3199 // up a vtable. We can just point at the one in java_lang_Object_. 3200 // 3201 // Array classes are simple enough that we don't need to do a full 3202 // link step. 3203 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3204 if (UNLIKELY(!init_done_)) { 3205 // Classes that were hand created, ie not by FindSystemClass 3206 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3207 new_class.Assign(GetClassRoot(kClassArrayClass)); 3208 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3209 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3210 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3211 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3212 } else if (strcmp(descriptor, 3213 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3214 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3215 } else if (strcmp(descriptor, 3216 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3217 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3218 } else if (strcmp(descriptor, "[C") == 0) { 3219 new_class.Assign(GetClassRoot(kCharArrayClass)); 3220 } else if (strcmp(descriptor, "[I") == 0) { 3221 new_class.Assign(GetClassRoot(kIntArrayClass)); 3222 } 3223 } 3224 if (new_class.Get() == nullptr) { 3225 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3226 if (new_class.Get() == nullptr) { 3227 return nullptr; 3228 } 3229 new_class->SetComponentType(component_type.Get()); 3230 } 3231 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3232 DCHECK(new_class->GetComponentType() != nullptr); 3233 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3234 new_class->SetSuperClass(java_lang_Object); 3235 new_class->SetVTable(java_lang_Object->GetVTable()); 3236 new_class->SetPrimitiveType(Primitive::kPrimNot); 3237 new_class->SetClassLoader(component_type->GetClassLoader()); 3238 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3239 new_class->PopulateEmbeddedImtAndVTable(); 3240 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3241 // don't need to set new_class->SetObjectSize(..) 3242 // because Object::SizeOf delegates to Array::SizeOf 3243 3244 3245 // All arrays have java/lang/Cloneable and java/io/Serializable as 3246 // interfaces. We need to set that up here, so that stuff like 3247 // "instanceof" works right. 3248 // 3249 // Note: The GC could run during the call to FindSystemClass, 3250 // so we need to make sure the class object is GC-valid while we're in 3251 // there. Do this by clearing the interface list so the GC will just 3252 // think that the entries are null. 3253 3254 3255 // Use the single, global copies of "interfaces" and "iftable" 3256 // (remember not to free them for arrays). 3257 { 3258 mirror::IfTable* array_iftable = array_iftable_.Read(); 3259 CHECK(array_iftable != nullptr); 3260 new_class->SetIfTable(array_iftable); 3261 } 3262 3263 // Inherit access flags from the component type. 3264 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3265 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3266 access_flags &= kAccJavaFlagsMask; 3267 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3268 // and remove "interface". 3269 access_flags |= kAccAbstract | kAccFinal; 3270 access_flags &= ~kAccInterface; 3271 3272 new_class->SetAccessFlags(access_flags); 3273 3274 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3275 if (existing == nullptr) { 3276 return new_class.Get(); 3277 } 3278 // Another thread must have loaded the class after we 3279 // started but before we finished. Abandon what we've 3280 // done. 3281 // 3282 // (Yes, this happens.) 3283 3284 return existing; 3285} 3286 3287mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3288 switch (type) { 3289 case 'B': 3290 return GetClassRoot(kPrimitiveByte); 3291 case 'C': 3292 return GetClassRoot(kPrimitiveChar); 3293 case 'D': 3294 return GetClassRoot(kPrimitiveDouble); 3295 case 'F': 3296 return GetClassRoot(kPrimitiveFloat); 3297 case 'I': 3298 return GetClassRoot(kPrimitiveInt); 3299 case 'J': 3300 return GetClassRoot(kPrimitiveLong); 3301 case 'S': 3302 return GetClassRoot(kPrimitiveShort); 3303 case 'Z': 3304 return GetClassRoot(kPrimitiveBoolean); 3305 case 'V': 3306 return GetClassRoot(kPrimitiveVoid); 3307 default: 3308 break; 3309 } 3310 std::string printable_type(PrintableChar(type)); 3311 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3312 return nullptr; 3313} 3314 3315mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3316 size_t hash) { 3317 if (VLOG_IS_ON(class_linker)) { 3318 mirror::DexCache* dex_cache = klass->GetDexCache(); 3319 std::string source; 3320 if (dex_cache != nullptr) { 3321 source += " from "; 3322 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3323 } 3324 LOG(INFO) << "Loaded class " << descriptor << source; 3325 } 3326 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3327 mirror::Class* existing = 3328 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3329 if (existing != nullptr) { 3330 return existing; 3331 } 3332 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3333 dex_cache_image_class_lookup_required_) { 3334 // Check a class loaded with the system class loader matches one in the image if the class 3335 // is in the image. 3336 existing = LookupClassFromImage(descriptor); 3337 if (existing != nullptr) { 3338 CHECK(klass == existing); 3339 } 3340 } 3341 VerifyObject(klass); 3342 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3343 if (log_new_class_table_roots_) { 3344 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3345 } 3346 return nullptr; 3347} 3348 3349mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3350 size_t hash) { 3351 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3352 mirror::Class* existing = 3353 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3354 3355 if (existing == nullptr) { 3356 CHECK(klass->IsProxyClass()); 3357 return nullptr; 3358 } 3359 3360 CHECK_NE(existing, klass) << descriptor; 3361 CHECK(!existing->IsResolved()) << descriptor; 3362 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3363 3364 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3365 it != end && it->first == hash; ++it) { 3366 mirror::Class* klass = it->second.Read(); 3367 if (klass == existing) { 3368 class_table_.erase(it); 3369 break; 3370 } 3371 } 3372 3373 CHECK(!klass->IsTemp()) << descriptor; 3374 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3375 dex_cache_image_class_lookup_required_) { 3376 // Check a class loaded with the system class loader matches one in the image if the class 3377 // is in the image. 3378 existing = LookupClassFromImage(descriptor); 3379 if (existing != nullptr) { 3380 CHECK(klass == existing) << descriptor; 3381 } 3382 } 3383 VerifyObject(klass); 3384 3385 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3386 if (log_new_class_table_roots_) { 3387 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3388 } 3389 3390 return existing; 3391} 3392 3393bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3394 size_t hash = Hash(descriptor); 3395 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3396 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3397 it != end && it->first == hash; 3398 ++it) { 3399 mirror::Class* klass = it->second.Read(); 3400 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3401 class_table_.erase(it); 3402 return true; 3403 } 3404 } 3405 return false; 3406} 3407 3408mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, 3409 const mirror::ClassLoader* class_loader) { 3410 size_t hash = Hash(descriptor); 3411 { 3412 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3413 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3414 if (result != nullptr) { 3415 return result; 3416 } 3417 } 3418 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3419 return nullptr; 3420 } else { 3421 // Lookup failed but need to search dex_caches_. 3422 mirror::Class* result = LookupClassFromImage(descriptor); 3423 if (result != nullptr) { 3424 InsertClass(descriptor, result, hash); 3425 } else { 3426 // Searching the image dex files/caches failed, we don't want to get into this situation 3427 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3428 // classes into the class table. 3429 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3430 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3431 MoveImageClassesToClassTable(); 3432 } 3433 } 3434 return result; 3435 } 3436} 3437 3438mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3439 const mirror::ClassLoader* class_loader, 3440 size_t hash) { 3441 auto end = class_table_.end(); 3442 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3443 mirror::Class* klass = it->second.Read(); 3444 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3445 if (kIsDebugBuild) { 3446 // Check for duplicates in the table. 3447 for (++it; it != end && it->first == hash; ++it) { 3448 mirror::Class* klass2 = it->second.Read(); 3449 CHECK(!(klass2->GetClassLoader() == class_loader && 3450 klass2->DescriptorEquals(descriptor))) 3451 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3452 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3453 } 3454 } 3455 return klass; 3456 } 3457 } 3458 return nullptr; 3459} 3460 3461static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3462 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3463 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3464 CHECK(image != nullptr); 3465 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3466 return root->AsObjectArray<mirror::DexCache>(); 3467} 3468 3469void ClassLinker::MoveImageClassesToClassTable() { 3470 Thread* self = Thread::Current(); 3471 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3472 if (!dex_cache_image_class_lookup_required_) { 3473 return; // All dex cache classes are already in the class table. 3474 } 3475 const char* old_no_suspend_cause = 3476 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3477 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3478 std::string temp; 3479 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3480 mirror::DexCache* dex_cache = dex_caches->Get(i); 3481 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3482 for (int32_t j = 0; j < types->GetLength(); j++) { 3483 mirror::Class* klass = types->Get(j); 3484 if (klass != nullptr) { 3485 DCHECK(klass->GetClassLoader() == nullptr); 3486 const char* descriptor = klass->GetDescriptor(&temp); 3487 size_t hash = Hash(descriptor); 3488 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3489 if (existing != nullptr) { 3490 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3491 << PrettyClassAndClassLoader(klass); 3492 } else { 3493 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3494 if (log_new_class_table_roots_) { 3495 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3496 } 3497 } 3498 } 3499 } 3500 } 3501 dex_cache_image_class_lookup_required_ = false; 3502 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3503} 3504 3505mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3506 Thread* self = Thread::Current(); 3507 const char* old_no_suspend_cause = 3508 self->StartAssertNoThreadSuspension("Image class lookup"); 3509 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3510 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3511 mirror::DexCache* dex_cache = dex_caches->Get(i); 3512 const DexFile* dex_file = dex_cache->GetDexFile(); 3513 // Try binary searching the string/type index. 3514 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3515 if (string_id != nullptr) { 3516 const DexFile::TypeId* type_id = 3517 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3518 if (type_id != nullptr) { 3519 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3520 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3521 if (klass != nullptr) { 3522 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3523 return klass; 3524 } 3525 } 3526 } 3527 } 3528 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3529 return nullptr; 3530} 3531 3532void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3533 result.clear(); 3534 if (dex_cache_image_class_lookup_required_) { 3535 MoveImageClassesToClassTable(); 3536 } 3537 size_t hash = Hash(descriptor); 3538 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3539 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3540 it != end && it->first == hash; ++it) { 3541 mirror::Class* klass = it->second.Read(); 3542 if (klass->DescriptorEquals(descriptor)) { 3543 result.push_back(klass); 3544 } 3545 } 3546} 3547 3548void ClassLinker::VerifyClass(Thread* self, ConstHandle<mirror::Class> klass) { 3549 // TODO: assert that the monitor on the Class is held 3550 ObjectLock<mirror::Class> lock(self, klass); 3551 3552 // Don't attempt to re-verify if already sufficiently verified. 3553 if (klass->IsVerified()) { 3554 EnsurePreverifiedMethods(klass); 3555 return; 3556 } 3557 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3558 return; 3559 } 3560 3561 // The class might already be erroneous, for example at compile time if we attempted to verify 3562 // this class as a parent to another. 3563 if (klass->IsErroneous()) { 3564 ThrowEarlierClassFailure(klass.Get()); 3565 return; 3566 } 3567 3568 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3569 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3570 } else { 3571 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3572 << PrettyClass(klass.Get()); 3573 CHECK(!Runtime::Current()->IsCompiler()); 3574 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3575 } 3576 3577 // Skip verification if disabled. 3578 if (!Runtime::Current()->IsVerificationEnabled()) { 3579 klass->SetStatus(mirror::Class::kStatusVerified, self); 3580 EnsurePreverifiedMethods(klass); 3581 return; 3582 } 3583 3584 // Verify super class. 3585 StackHandleScope<2> hs(self); 3586 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3587 if (super.Get() != nullptr) { 3588 // Acquire lock to prevent races on verifying the super class. 3589 ObjectLock<mirror::Class> lock(self, super); 3590 3591 if (!super->IsVerified() && !super->IsErroneous()) { 3592 VerifyClass(self, super); 3593 } 3594 if (!super->IsCompileTimeVerified()) { 3595 std::string error_msg( 3596 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3597 PrettyDescriptor(klass.Get()).c_str(), 3598 PrettyDescriptor(super.Get()).c_str())); 3599 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3600 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3601 if (cause.Get() != nullptr) { 3602 self->ClearException(); 3603 } 3604 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3605 if (cause.Get() != nullptr) { 3606 self->GetException(nullptr)->SetCause(cause.Get()); 3607 } 3608 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3609 if (Runtime::Current()->IsCompiler()) { 3610 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3611 } 3612 klass->SetStatus(mirror::Class::kStatusError, self); 3613 return; 3614 } 3615 } 3616 3617 // Try to use verification information from the oat file, otherwise do runtime verification. 3618 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3619 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3620 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3621 if (oat_file_class_status == mirror::Class::kStatusError) { 3622 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3623 << PrettyDescriptor(klass.Get()) << " in " 3624 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3625 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3626 PrettyDescriptor(klass.Get()).c_str()); 3627 klass->SetStatus(mirror::Class::kStatusError, self); 3628 return; 3629 } 3630 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3631 std::string error_msg; 3632 if (!preverified) { 3633 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3634 Runtime::Current()->IsCompiler(), 3635 &error_msg); 3636 } 3637 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3638 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3639 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3640 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3641 << " because: " << error_msg; 3642 } 3643 self->AssertNoPendingException(); 3644 // Make sure all classes referenced by catch blocks are resolved. 3645 ResolveClassExceptionHandlerTypes(dex_file, klass); 3646 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3647 // Even though there were no verifier failures we need to respect whether the super-class 3648 // was verified or requiring runtime reverification. 3649 if (super.Get() == nullptr || super->IsVerified()) { 3650 klass->SetStatus(mirror::Class::kStatusVerified, self); 3651 } else { 3652 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3653 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3654 // Pretend a soft failure occured so that we don't consider the class verified below. 3655 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3656 } 3657 } else { 3658 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3659 // Soft failures at compile time should be retried at runtime. Soft 3660 // failures at runtime will be handled by slow paths in the generated 3661 // code. Set status accordingly. 3662 if (Runtime::Current()->IsCompiler()) { 3663 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3664 } else { 3665 klass->SetStatus(mirror::Class::kStatusVerified, self); 3666 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3667 // later. 3668 klass->SetPreverified(); 3669 } 3670 } 3671 } else { 3672 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3673 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3674 << " because: " << error_msg; 3675 self->AssertNoPendingException(); 3676 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3677 klass->SetStatus(mirror::Class::kStatusError, self); 3678 } 3679 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3680 // Class is verified so we don't need to do any access check on its methods. 3681 // Let the interpreter know it by setting the kAccPreverified flag onto each 3682 // method. 3683 // Note: we're going here during compilation and at runtime. When we set the 3684 // kAccPreverified flag when compiling image classes, the flag is recorded 3685 // in the image and is set when loading the image. 3686 EnsurePreverifiedMethods(klass); 3687 } 3688} 3689 3690void ClassLinker::EnsurePreverifiedMethods(ConstHandle<mirror::Class> klass) { 3691 if (!klass->IsPreverified()) { 3692 klass->SetPreverifiedFlagOnAllMethods(); 3693 klass->SetPreverified(); 3694 } 3695} 3696 3697bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3698 mirror::Class::Status& oat_file_class_status) { 3699 // If we're compiling, we can only verify the class using the oat file if 3700 // we are not compiling the image or if the class we're verifying is not part of 3701 // the app. In other words, we will only check for preverification of bootclasspath 3702 // classes. 3703 if (Runtime::Current()->IsCompiler()) { 3704 // Are we compiling the bootclasspath? 3705 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3706 return false; 3707 } 3708 // We are compiling an app (not the image). 3709 3710 // Is this an app class? (I.e. not a bootclasspath class) 3711 if (klass->GetClassLoader() != nullptr) { 3712 return false; 3713 } 3714 } 3715 3716 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3717 // In case we run without an image there won't be a backing oat file. 3718 if (oat_dex_file == nullptr) { 3719 return false; 3720 } 3721 3722 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3723 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3724 if (oat_file_class_status == mirror::Class::kStatusVerified || 3725 oat_file_class_status == mirror::Class::kStatusInitialized) { 3726 return true; 3727 } 3728 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3729 // Compile time verification failed with a soft error. Compile time verification can fail 3730 // because we have incomplete type information. Consider the following: 3731 // class ... { 3732 // Foo x; 3733 // .... () { 3734 // if (...) { 3735 // v1 gets assigned a type of resolved class Foo 3736 // } else { 3737 // v1 gets assigned a type of unresolved class Bar 3738 // } 3739 // iput x = v1 3740 // } } 3741 // when we merge v1 following the if-the-else it results in Conflict 3742 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3743 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3744 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3745 // at compile time). 3746 return false; 3747 } 3748 if (oat_file_class_status == mirror::Class::kStatusError) { 3749 // Compile time verification failed with a hard error. This is caused by invalid instructions 3750 // in the class. These errors are unrecoverable. 3751 return false; 3752 } 3753 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3754 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3755 // not loading the class. 3756 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3757 // isn't a problem and this case shouldn't occur 3758 return false; 3759 } 3760 std::string temp; 3761 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3762 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3763 << klass->GetDescriptor(&temp); 3764 3765 return false; 3766} 3767 3768void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3769 ConstHandle<mirror::Class> klass) { 3770 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3771 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3772 } 3773 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3774 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3775 } 3776} 3777 3778void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3779 mirror::ArtMethod* method) { 3780 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3781 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3782 if (code_item == nullptr) { 3783 return; // native or abstract method 3784 } 3785 if (code_item->tries_size_ == 0) { 3786 return; // nothing to process 3787 } 3788 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3789 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3790 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3791 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3792 CatchHandlerIterator iterator(handlers_ptr); 3793 for (; iterator.HasNext(); iterator.Next()) { 3794 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3795 // unresolved exception types will be ignored by exception delivery 3796 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3797 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3798 if (exception_type == nullptr) { 3799 DCHECK(Thread::Current()->IsExceptionPending()); 3800 Thread::Current()->ClearException(); 3801 } 3802 } 3803 } 3804 handlers_ptr = iterator.EndDataPointer(); 3805 } 3806} 3807 3808static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3809static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3810 ConstHandle<mirror::ArtMethod> prototype); 3811 3812mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3813 jobjectArray interfaces, jobject loader, 3814 jobjectArray methods, jobjectArray throws) { 3815 Thread* self = soa.Self(); 3816 StackHandleScope<8> hs(self); 3817 Handle<mirror::Class> klass(hs.NewHandle( 3818 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3819 if (klass.Get() == nullptr) { 3820 CHECK(self->IsExceptionPending()); // OOME. 3821 return nullptr; 3822 } 3823 DCHECK(klass->GetClass() != nullptr); 3824 klass->SetObjectSize(sizeof(mirror::Proxy)); 3825 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3826 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3827 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3828 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3829 klass->SetName(soa.Decode<mirror::String*>(name)); 3830 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3831 klass->SetDexCache(proxy_class->GetDexCache()); 3832 klass->SetStatus(mirror::Class::kStatusIdx, self); 3833 3834 // Instance fields are inherited, but we add a couple of static fields... 3835 { 3836 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3837 if (UNLIKELY(sfields == nullptr)) { 3838 CHECK(self->IsExceptionPending()); // OOME. 3839 return nullptr; 3840 } 3841 klass->SetSFields(sfields); 3842 } 3843 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3844 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3845 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3846 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3847 CHECK(self->IsExceptionPending()); // OOME. 3848 return nullptr; 3849 } 3850 klass->SetStaticField(0, interfaces_sfield.Get()); 3851 interfaces_sfield->SetDexFieldIndex(0); 3852 interfaces_sfield->SetDeclaringClass(klass.Get()); 3853 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3854 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3855 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3856 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3857 CHECK(self->IsExceptionPending()); // OOME. 3858 return nullptr; 3859 } 3860 klass->SetStaticField(1, throws_sfield.Get()); 3861 throws_sfield->SetDexFieldIndex(1); 3862 throws_sfield->SetDeclaringClass(klass.Get()); 3863 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3864 3865 // Proxies have 1 direct method, the constructor 3866 { 3867 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3868 if (UNLIKELY(directs == nullptr)) { 3869 CHECK(self->IsExceptionPending()); // OOME. 3870 return nullptr; 3871 } 3872 klass->SetDirectMethods(directs); 3873 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3874 if (UNLIKELY(constructor == nullptr)) { 3875 CHECK(self->IsExceptionPending()); // OOME. 3876 return nullptr; 3877 } 3878 klass->SetDirectMethod(0, constructor); 3879 } 3880 3881 // Create virtual method using specified prototypes. 3882 size_t num_virtual_methods = 3883 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3884 { 3885 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3886 num_virtual_methods); 3887 if (UNLIKELY(virtuals == nullptr)) { 3888 CHECK(self->IsExceptionPending()); // OOME. 3889 return nullptr; 3890 } 3891 klass->SetVirtualMethods(virtuals); 3892 } 3893 for (size_t i = 0; i < num_virtual_methods; ++i) { 3894 StackHandleScope<1> hs(self); 3895 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3896 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3897 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3898 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3899 if (UNLIKELY(clone == nullptr)) { 3900 CHECK(self->IsExceptionPending()); // OOME. 3901 return nullptr; 3902 } 3903 klass->SetVirtualMethod(i, clone); 3904 } 3905 3906 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3907 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3908 self->AssertNoPendingException(); 3909 3910 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3911 mirror::Class* new_class = nullptr; 3912 { 3913 // Must hold lock on object when resolved. 3914 ObjectLock<mirror::Class> resolution_lock(self, klass); 3915 // Link the fields and virtual methods, creating vtable and iftables 3916 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3917 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3918 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3919 klass->SetStatus(mirror::Class::kStatusError, self); 3920 return nullptr; 3921 } 3922 } 3923 3924 CHECK(klass->IsRetired()); 3925 CHECK_NE(klass.Get(), new_class); 3926 klass.Assign(new_class); 3927 3928 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3929 interfaces_sfield->SetObject<false>(klass.Get(), 3930 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3931 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3932 throws_sfield->SetObject<false>(klass.Get(), 3933 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3934 3935 { 3936 // Lock on klass is released. Lock new class object. 3937 ObjectLock<mirror::Class> initialization_lock(self, klass); 3938 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3939 } 3940 3941 // sanity checks 3942 if (kIsDebugBuild) { 3943 CHECK(klass->GetIFields() == nullptr); 3944 CheckProxyConstructor(klass->GetDirectMethod(0)); 3945 for (size_t i = 0; i < num_virtual_methods; ++i) { 3946 StackHandleScope<2> hs(self); 3947 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3948 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3949 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3950 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3951 CheckProxyMethod(virtual_method, prototype); 3952 } 3953 3954 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3955 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3956 decoded_name->ToModifiedUtf8().c_str())); 3957 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3958 3959 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3960 decoded_name->ToModifiedUtf8().c_str())); 3961 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3962 3963 CHECK_EQ(klass.Get()->GetInterfaces(), 3964 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3965 CHECK_EQ(klass.Get()->GetThrows(), 3966 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3967 } 3968 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3969 CHECK(existing == nullptr); 3970 return klass.Get(); 3971} 3972 3973std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3974 DCHECK(proxy_class->IsProxyClass()); 3975 mirror::String* name = proxy_class->GetName(); 3976 DCHECK(name != nullptr); 3977 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3978} 3979 3980mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3981 mirror::ArtMethod* proxy_method) { 3982 DCHECK(proxy_class->IsProxyClass()); 3983 DCHECK(proxy_method->IsProxyMethod()); 3984 // Locate the dex cache of the original interface/Object 3985 mirror::DexCache* dex_cache = nullptr; 3986 { 3987 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3988 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3989 mirror::DexCache* a_dex_cache = GetDexCache(i); 3990 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3991 dex_cache = a_dex_cache; 3992 break; 3993 } 3994 } 3995 } 3996 CHECK(dex_cache != nullptr); 3997 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3998 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3999 CHECK(resolved_method != nullptr); 4000 return resolved_method; 4001} 4002 4003 4004mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 4005 ConstHandle<mirror::Class> klass, 4006 mirror::Class* proxy_class) { 4007 // Create constructor for Proxy that must initialize h 4008 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 4009 proxy_class->GetDirectMethods(); 4010 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 4011 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 4012 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 4013 // constructor method. 4014 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 4015 proxy_constructor); 4016 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 4017 // code_ too) 4018 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 4019 if (constructor == nullptr) { 4020 CHECK(self->IsExceptionPending()); // OOME. 4021 return nullptr; 4022 } 4023 // Make this constructor public and fix the class to be our Proxy version 4024 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 4025 constructor->SetDeclaringClass(klass.Get()); 4026 return constructor; 4027} 4028 4029static void CheckProxyConstructor(mirror::ArtMethod* constructor) 4030 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4031 CHECK(constructor->IsConstructor()); 4032 CHECK_STREQ(constructor->GetName(), "<init>"); 4033 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4034 "(Ljava/lang/reflect/InvocationHandler;)V"); 4035 DCHECK(constructor->IsPublic()); 4036} 4037 4038mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4039 ConstHandle<mirror::Class> klass, 4040 ConstHandle<mirror::ArtMethod> prototype) { 4041 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4042 // prototype method 4043 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4044 prototype.Get()); 4045 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4046 // as necessary 4047 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4048 if (UNLIKELY(method == nullptr)) { 4049 CHECK(self->IsExceptionPending()); // OOME. 4050 return nullptr; 4051 } 4052 4053 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4054 // the intersection of throw exceptions as defined in Proxy 4055 method->SetDeclaringClass(klass.Get()); 4056 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4057 4058 // At runtime the method looks like a reference and argument saving method, clone the code 4059 // related parameters from this method. 4060 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4061 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4062 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4063 4064 return method; 4065} 4066 4067static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 4068 ConstHandle<mirror::ArtMethod> prototype) 4069 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4070 // Basic sanity 4071 CHECK(!prototype->IsFinal()); 4072 CHECK(method->IsFinal()); 4073 CHECK(!method->IsAbstract()); 4074 4075 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4076 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4077 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4078 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4079 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4080 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4081 4082 StackHandleScope<2> hs(Thread::Current()); 4083 MethodHelper mh(hs.NewHandle(method.Get())); 4084 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4085 CHECK_STREQ(method->GetName(), prototype->GetName()); 4086 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4087 // More complex sanity - via dex cache 4088 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4089} 4090 4091static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4092 bool can_init_parents) 4093 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4094 if (can_init_statics && can_init_parents) { 4095 return true; 4096 } 4097 if (!can_init_statics) { 4098 // Check if there's a class initializer. 4099 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4100 if (clinit != nullptr) { 4101 return false; 4102 } 4103 // Check if there are encoded static values needing initialization. 4104 if (klass->NumStaticFields() != 0) { 4105 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4106 DCHECK(dex_class_def != nullptr); 4107 if (dex_class_def->static_values_off_ != 0) { 4108 return false; 4109 } 4110 } 4111 } 4112 if (!klass->IsInterface() && klass->HasSuperClass()) { 4113 mirror::Class* super_class = klass->GetSuperClass(); 4114 if (!can_init_parents && !super_class->IsInitialized()) { 4115 return false; 4116 } else { 4117 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4118 return false; 4119 } 4120 } 4121 } 4122 return true; 4123} 4124 4125bool ClassLinker::InitializeClass(Thread* self, ConstHandle<mirror::Class> klass, 4126 bool can_init_statics, bool can_init_parents) { 4127 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4128 4129 // Are we already initialized and therefore done? 4130 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4131 // an initialized class will never change its state. 4132 if (klass->IsInitialized()) { 4133 return true; 4134 } 4135 4136 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4137 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4138 return false; 4139 } 4140 4141 self->AllowThreadSuspension(); 4142 uint64_t t0; 4143 { 4144 ObjectLock<mirror::Class> lock(self, klass); 4145 4146 // Re-check under the lock in case another thread initialized ahead of us. 4147 if (klass->IsInitialized()) { 4148 return true; 4149 } 4150 4151 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4152 if (klass->IsErroneous()) { 4153 ThrowEarlierClassFailure(klass.Get()); 4154 return false; 4155 } 4156 4157 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4158 4159 if (!klass->IsVerified()) { 4160 VerifyClass(self, klass); 4161 if (!klass->IsVerified()) { 4162 // We failed to verify, expect either the klass to be erroneous or verification failed at 4163 // compile time. 4164 if (klass->IsErroneous()) { 4165 CHECK(self->IsExceptionPending()); 4166 } else { 4167 CHECK(Runtime::Current()->IsCompiler()); 4168 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4169 } 4170 return false; 4171 } else { 4172 self->AssertNoPendingException(); 4173 } 4174 } 4175 4176 // If the class is kStatusInitializing, either this thread is 4177 // initializing higher up the stack or another thread has beat us 4178 // to initializing and we need to wait. Either way, this 4179 // invocation of InitializeClass will not be responsible for 4180 // running <clinit> and will return. 4181 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4182 // Could have got an exception during verification. 4183 if (self->IsExceptionPending()) { 4184 return false; 4185 } 4186 // We caught somebody else in the act; was it us? 4187 if (klass->GetClinitThreadId() == self->GetTid()) { 4188 // Yes. That's fine. Return so we can continue initializing. 4189 return true; 4190 } 4191 // No. That's fine. Wait for another thread to finish initializing. 4192 return WaitForInitializeClass(klass, self, lock); 4193 } 4194 4195 if (!ValidateSuperClassDescriptors(klass)) { 4196 klass->SetStatus(mirror::Class::kStatusError, self); 4197 return false; 4198 } 4199 self->AllowThreadSuspension(); 4200 4201 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4202 4203 // From here out other threads may observe that we're initializing and so changes of state 4204 // require the a notification. 4205 klass->SetClinitThreadId(self->GetTid()); 4206 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4207 4208 t0 = NanoTime(); 4209 } 4210 4211 // Initialize super classes, must be done while initializing for the JLS. 4212 if (!klass->IsInterface() && klass->HasSuperClass()) { 4213 mirror::Class* super_class = klass->GetSuperClass(); 4214 if (!super_class->IsInitialized()) { 4215 CHECK(!super_class->IsInterface()); 4216 CHECK(can_init_parents); 4217 StackHandleScope<1> hs(self); 4218 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4219 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4220 if (!super_initialized) { 4221 // The super class was verified ahead of entering initializing, we should only be here if 4222 // the super class became erroneous due to initialization. 4223 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4224 << "Super class initialization failed for " 4225 << PrettyDescriptor(handle_scope_super.Get()) 4226 << " that has unexpected status " << handle_scope_super->GetStatus() 4227 << "\nPending exception:\n" 4228 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4229 ObjectLock<mirror::Class> lock(self, klass); 4230 // Initialization failed because the super-class is erroneous. 4231 klass->SetStatus(mirror::Class::kStatusError, self); 4232 return false; 4233 } 4234 } 4235 } 4236 4237 if (klass->NumStaticFields() > 0) { 4238 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4239 CHECK(dex_class_def != nullptr); 4240 const DexFile& dex_file = klass->GetDexFile(); 4241 StackHandleScope<3> hs(self); 4242 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4243 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4244 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4245 this, *dex_class_def); 4246 const byte* class_data = dex_file.GetClassData(*dex_class_def); 4247 ClassDataItemIterator field_it(dex_file, class_data); 4248 if (value_it.HasNext()) { 4249 DCHECK(field_it.HasNextStaticField()); 4250 CHECK(can_init_statics); 4251 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4252 StackHandleScope<1> hs(self); 4253 Handle<mirror::ArtField> field(hs.NewHandle( 4254 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4255 if (Runtime::Current()->IsActiveTransaction()) { 4256 value_it.ReadValueToField<true>(field); 4257 } else { 4258 value_it.ReadValueToField<false>(field); 4259 } 4260 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4261 } 4262 } 4263 } 4264 4265 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4266 if (clinit != nullptr) { 4267 CHECK(can_init_statics); 4268 JValue result; 4269 clinit->Invoke(self, nullptr, 0, &result, "V"); 4270 } 4271 4272 self->AllowThreadSuspension(); 4273 uint64_t t1 = NanoTime(); 4274 4275 bool success = true; 4276 { 4277 ObjectLock<mirror::Class> lock(self, klass); 4278 4279 if (self->IsExceptionPending()) { 4280 WrapExceptionInInitializer(); 4281 klass->SetStatus(mirror::Class::kStatusError, self); 4282 success = false; 4283 } else { 4284 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4285 RuntimeStats* thread_stats = self->GetStats(); 4286 ++global_stats->class_init_count; 4287 ++thread_stats->class_init_count; 4288 global_stats->class_init_time_ns += (t1 - t0); 4289 thread_stats->class_init_time_ns += (t1 - t0); 4290 // Set the class as initialized except if failed to initialize static fields. 4291 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4292 if (VLOG_IS_ON(class_linker)) { 4293 std::string temp; 4294 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4295 klass->GetLocation(); 4296 } 4297 // Opportunistically set static method trampolines to their destination. 4298 FixupStaticTrampolines(klass.Get()); 4299 } 4300 } 4301 return success; 4302} 4303 4304bool ClassLinker::WaitForInitializeClass(ConstHandle<mirror::Class> klass, Thread* self, 4305 ObjectLock<mirror::Class>& lock) 4306 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4307 while (true) { 4308 self->AssertNoPendingException(); 4309 CHECK(!klass->IsInitialized()); 4310 lock.WaitIgnoringInterrupts(); 4311 4312 // When we wake up, repeat the test for init-in-progress. If 4313 // there's an exception pending (only possible if 4314 // "interruptShouldThrow" was set), bail out. 4315 if (self->IsExceptionPending()) { 4316 WrapExceptionInInitializer(); 4317 klass->SetStatus(mirror::Class::kStatusError, self); 4318 return false; 4319 } 4320 // Spurious wakeup? Go back to waiting. 4321 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4322 continue; 4323 } 4324 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4325 // Compile time initialization failed. 4326 return false; 4327 } 4328 if (klass->IsErroneous()) { 4329 // The caller wants an exception, but it was thrown in a 4330 // different thread. Synthesize one here. 4331 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4332 PrettyDescriptor(klass.Get()).c_str()); 4333 return false; 4334 } 4335 if (klass->IsInitialized()) { 4336 return true; 4337 } 4338 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4339 << klass->GetStatus(); 4340 } 4341 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4342} 4343 4344bool ClassLinker::ValidateSuperClassDescriptors(ConstHandle<mirror::Class> klass) { 4345 if (klass->IsInterface()) { 4346 return true; 4347 } 4348 // Begin with the methods local to the superclass. 4349 StackHandleScope<2> hs(Thread::Current()); 4350 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4351 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4352 if (klass->HasSuperClass() && 4353 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4354 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4355 mh.ChangeMethod(klass->GetVTableEntry(i)); 4356 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4357 if (mh.GetMethod() != super_mh.GetMethod() && 4358 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4359 ThrowLinkageError(klass.Get(), 4360 "Class %s method %s resolves differently in superclass %s", 4361 PrettyDescriptor(klass.Get()).c_str(), 4362 PrettyMethod(mh.GetMethod()).c_str(), 4363 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4364 return false; 4365 } 4366 } 4367 } 4368 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4369 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4370 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4371 for (uint32_t j = 0; j < num_methods; ++j) { 4372 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4373 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4374 if (mh.GetMethod() != super_mh.GetMethod() && 4375 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4376 ThrowLinkageError(klass.Get(), 4377 "Class %s method %s resolves differently in interface %s", 4378 PrettyDescriptor(klass.Get()).c_str(), 4379 PrettyMethod(mh.GetMethod()).c_str(), 4380 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4381 return false; 4382 } 4383 } 4384 } 4385 } 4386 return true; 4387} 4388 4389bool ClassLinker::EnsureInitialized(Thread* self, ConstHandle<mirror::Class> c, 4390 bool can_init_fields, bool can_init_parents) { 4391 DCHECK(c.Get() != nullptr); 4392 if (c->IsInitialized()) { 4393 EnsurePreverifiedMethods(c); 4394 return true; 4395 } 4396 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4397 if (!success) { 4398 if (can_init_fields && can_init_parents) { 4399 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4400 } 4401 } else { 4402 self->AssertNoPendingException(); 4403 } 4404 return success; 4405} 4406 4407void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4408 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4409 if (fields != nullptr) { 4410 for (int index = 0; index < fields->GetLength(); index ++) { 4411 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4412 fields->Get(index)->SetDeclaringClass(new_class); 4413 } 4414 } 4415 } 4416 4417 fields = new_class->GetSFields(); 4418 if (fields != nullptr) { 4419 for (int index = 0; index < fields->GetLength(); index ++) { 4420 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4421 fields->Get(index)->SetDeclaringClass(new_class); 4422 } 4423 } 4424 } 4425 4426 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4427 if (methods != nullptr) { 4428 for (int index = 0; index < methods->GetLength(); index ++) { 4429 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4430 methods->Get(index)->SetDeclaringClass(new_class); 4431 } 4432 } 4433 } 4434 4435 methods = new_class->GetVirtualMethods(); 4436 if (methods != nullptr) { 4437 for (int index = 0; index < methods->GetLength(); index ++) { 4438 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4439 methods->Get(index)->SetDeclaringClass(new_class); 4440 } 4441 } 4442 } 4443} 4444 4445bool ClassLinker::LinkClass(Thread* self, const char* descriptor, ConstHandle<mirror::Class> klass, 4446 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces, 4447 mirror::Class** new_class) { 4448 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4449 4450 if (!LinkSuperClass(klass)) { 4451 return false; 4452 } 4453 if (!LinkMethods(self, klass, interfaces)) { 4454 return false; 4455 } 4456 if (!LinkInstanceFields(self, klass)) { 4457 return false; 4458 } 4459 size_t class_size; 4460 if (!LinkStaticFields(self, klass, &class_size)) { 4461 return false; 4462 } 4463 CreateReferenceInstanceOffsets(klass); 4464 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4465 4466 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4467 // We don't need to retire this class as it has no embedded tables or it was created the 4468 // correct size during class linker initialization. 4469 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4470 4471 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4472 klass->PopulateEmbeddedImtAndVTable(); 4473 } 4474 4475 // This will notify waiters on klass that saw the not yet resolved 4476 // class in the class_table_ during EnsureResolved. 4477 klass->SetStatus(mirror::Class::kStatusResolved, self); 4478 *new_class = klass.Get(); 4479 } else { 4480 CHECK(!klass->IsResolved()); 4481 // Retire the temporary class and create the correctly sized resolved class. 4482 *new_class = klass->CopyOf(self, class_size); 4483 if (UNLIKELY(*new_class == nullptr)) { 4484 CHECK(self->IsExceptionPending()); // Expect an OOME. 4485 klass->SetStatus(mirror::Class::kStatusError, self); 4486 return false; 4487 } 4488 4489 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4490 StackHandleScope<1> hs(self); 4491 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4492 ObjectLock<mirror::Class> lock(self, new_class_h); 4493 4494 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4495 4496 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4497 CHECK(existing == nullptr || existing == klass.Get()); 4498 4499 // This will notify waiters on temp class that saw the not yet resolved class in the 4500 // class_table_ during EnsureResolved. 4501 klass->SetStatus(mirror::Class::kStatusRetired, self); 4502 4503 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4504 // This will notify waiters on new_class that saw the not yet resolved 4505 // class in the class_table_ during EnsureResolved. 4506 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4507 } 4508 return true; 4509} 4510 4511bool ClassLinker::LoadSuperAndInterfaces(ConstHandle<mirror::Class> klass, const DexFile& dex_file) { 4512 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4513 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4514 uint16_t super_class_idx = class_def.superclass_idx_; 4515 if (super_class_idx != DexFile::kDexNoIndex16) { 4516 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4517 if (super_class == nullptr) { 4518 DCHECK(Thread::Current()->IsExceptionPending()); 4519 return false; 4520 } 4521 // Verify 4522 if (!klass->CanAccess(super_class)) { 4523 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4524 PrettyDescriptor(super_class).c_str(), 4525 PrettyDescriptor(klass.Get()).c_str()); 4526 return false; 4527 } 4528 CHECK(super_class->IsResolved()); 4529 klass->SetSuperClass(super_class); 4530 } 4531 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4532 if (interfaces != nullptr) { 4533 for (size_t i = 0; i < interfaces->Size(); i++) { 4534 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4535 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4536 if (interface == nullptr) { 4537 DCHECK(Thread::Current()->IsExceptionPending()); 4538 return false; 4539 } 4540 // Verify 4541 if (!klass->CanAccess(interface)) { 4542 // TODO: the RI seemed to ignore this in my testing. 4543 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4544 PrettyDescriptor(interface).c_str(), 4545 PrettyDescriptor(klass.Get()).c_str()); 4546 return false; 4547 } 4548 } 4549 } 4550 // Mark the class as loaded. 4551 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4552 return true; 4553} 4554 4555bool ClassLinker::LinkSuperClass(ConstHandle<mirror::Class> klass) { 4556 CHECK(!klass->IsPrimitive()); 4557 mirror::Class* super = klass->GetSuperClass(); 4558 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4559 if (super != nullptr) { 4560 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4561 return false; 4562 } 4563 return true; 4564 } 4565 if (super == nullptr) { 4566 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4567 PrettyDescriptor(klass.Get()).c_str()); 4568 return false; 4569 } 4570 // Verify 4571 if (super->IsFinal() || super->IsInterface()) { 4572 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4573 PrettyDescriptor(super).c_str(), 4574 PrettyDescriptor(klass.Get()).c_str(), 4575 super->IsFinal() ? "declared final" : "an interface"); 4576 return false; 4577 } 4578 if (!klass->CanAccess(super)) { 4579 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4580 PrettyDescriptor(super).c_str(), 4581 PrettyDescriptor(klass.Get()).c_str()); 4582 return false; 4583 } 4584 4585 // Inherit kAccClassIsFinalizable from the superclass in case this 4586 // class doesn't override finalize. 4587 if (super->IsFinalizable()) { 4588 klass->SetFinalizable(); 4589 } 4590 4591 // Inherit reference flags (if any) from the superclass. 4592 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4593 if (reference_flags != 0) { 4594 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4595 } 4596 // Disallow custom direct subclasses of java.lang.ref.Reference. 4597 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4598 ThrowLinkageError(klass.Get(), 4599 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4600 PrettyDescriptor(klass.Get()).c_str()); 4601 return false; 4602 } 4603 4604 if (kIsDebugBuild) { 4605 // Ensure super classes are fully resolved prior to resolving fields.. 4606 while (super != nullptr) { 4607 CHECK(super->IsResolved()); 4608 super = super->GetSuperClass(); 4609 } 4610 } 4611 return true; 4612} 4613 4614// Populate the class vtable and itable. Compute return type indices. 4615bool ClassLinker::LinkMethods(Thread* self, ConstHandle<mirror::Class> klass, 4616 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4617 self->AllowThreadSuspension(); 4618 if (klass->IsInterface()) { 4619 // No vtable. 4620 size_t count = klass->NumVirtualMethods(); 4621 if (!IsUint(16, count)) { 4622 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4623 return false; 4624 } 4625 for (size_t i = 0; i < count; ++i) { 4626 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4627 } 4628 // Link interface method tables 4629 return LinkInterfaceMethods(klass, interfaces); 4630 } else { 4631 // Link virtual and interface method tables 4632 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4633 } 4634 return true; 4635} 4636 4637bool ClassLinker::LinkVirtualMethods(Thread* self, ConstHandle<mirror::Class> klass) { 4638 if (klass->HasSuperClass()) { 4639 uint32_t max_count = klass->NumVirtualMethods() + 4640 klass->GetSuperClass()->GetVTableLength(); 4641 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4642 CHECK_LE(actual_count, max_count); 4643 StackHandleScope<4> hs(self); 4644 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4645 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4646 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4647 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4648 if (UNLIKELY(vtable.Get() == nullptr)) { 4649 CHECK(self->IsExceptionPending()); // OOME. 4650 return false; 4651 } 4652 int len = super_class->GetVTableLength(); 4653 for (int i = 0; i < len; i++) { 4654 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4655 } 4656 } else { 4657 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4658 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4659 if (UNLIKELY(vtable.Get() == nullptr)) { 4660 CHECK(self->IsExceptionPending()); // OOME. 4661 return false; 4662 } 4663 } 4664 4665 // See if any of our virtual methods override the superclass. 4666 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4667 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4668 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4669 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4670 local_mh.ChangeMethod(local_method); 4671 size_t j = 0; 4672 for (; j < actual_count; ++j) { 4673 mirror::ArtMethod* super_method = vtable->Get(j); 4674 super_mh.ChangeMethod(super_method); 4675 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4676 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4677 super_method->GetAccessFlags())) { 4678 if (super_method->IsFinal()) { 4679 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4680 PrettyMethod(local_method).c_str(), 4681 super_method->GetDeclaringClassDescriptor()); 4682 return false; 4683 } 4684 vtable->Set<false>(j, local_method); 4685 local_method->SetMethodIndex(j); 4686 break; 4687 } else { 4688 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4689 << " would have incorrectly overridden the package-private method in " 4690 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4691 } 4692 } 4693 } 4694 if (j == actual_count) { 4695 // Not overriding, append. 4696 vtable->Set<false>(actual_count, local_method); 4697 local_method->SetMethodIndex(actual_count); 4698 actual_count += 1; 4699 } 4700 } 4701 if (!IsUint(16, actual_count)) { 4702 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4703 return false; 4704 } 4705 // Shrink vtable if possible 4706 CHECK_LE(actual_count, max_count); 4707 if (actual_count < max_count) { 4708 vtable.Assign(vtable->CopyOf(self, actual_count)); 4709 if (UNLIKELY(vtable.Get() == nullptr)) { 4710 CHECK(self->IsExceptionPending()); // OOME. 4711 return false; 4712 } 4713 } 4714 klass->SetVTable(vtable.Get()); 4715 } else { 4716 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4717 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4718 if (!IsUint(16, num_virtual_methods)) { 4719 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4720 return false; 4721 } 4722 StackHandleScope<1> hs(self); 4723 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4724 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4725 if (UNLIKELY(vtable.Get() == nullptr)) { 4726 CHECK(self->IsExceptionPending()); // OOME. 4727 return false; 4728 } 4729 for (size_t i = 0; i < num_virtual_methods; ++i) { 4730 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4731 vtable->Set<false>(i, virtual_method); 4732 virtual_method->SetMethodIndex(i & 0xFFFF); 4733 } 4734 klass->SetVTable(vtable.Get()); 4735 } 4736 return true; 4737} 4738 4739bool ClassLinker::LinkInterfaceMethods(ConstHandle<mirror::Class> klass, 4740 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4741 Thread* const self = Thread::Current(); 4742 Runtime* const runtime = Runtime::Current(); 4743 // Set the imt table to be all conflicts by default. 4744 klass->SetImTable(runtime->GetDefaultImt()); 4745 size_t super_ifcount; 4746 if (klass->HasSuperClass()) { 4747 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4748 } else { 4749 super_ifcount = 0; 4750 } 4751 uint32_t num_interfaces = 4752 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4753 size_t ifcount = super_ifcount + num_interfaces; 4754 for (size_t i = 0; i < num_interfaces; i++) { 4755 mirror::Class* interface = 4756 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4757 interfaces->Get(i); 4758 ifcount += interface->GetIfTableCount(); 4759 } 4760 if (ifcount == 0) { 4761 // Class implements no interfaces. 4762 DCHECK_EQ(klass->GetIfTableCount(), 0); 4763 DCHECK(klass->GetIfTable() == nullptr); 4764 return true; 4765 } 4766 if (ifcount == super_ifcount) { 4767 // Class implements same interfaces as parent, are any of these not marker interfaces? 4768 bool has_non_marker_interface = false; 4769 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4770 for (size_t i = 0; i < ifcount; ++i) { 4771 if (super_iftable->GetMethodArrayCount(i) > 0) { 4772 has_non_marker_interface = true; 4773 break; 4774 } 4775 } 4776 if (!has_non_marker_interface) { 4777 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4778 klass->SetIfTable(super_iftable); 4779 return true; 4780 } 4781 } 4782 StackHandleScope<5> hs(self); 4783 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4784 if (UNLIKELY(iftable.Get() == nullptr)) { 4785 CHECK(self->IsExceptionPending()); // OOME. 4786 return false; 4787 } 4788 if (super_ifcount != 0) { 4789 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4790 for (size_t i = 0; i < super_ifcount; i++) { 4791 mirror::Class* super_interface = super_iftable->GetInterface(i); 4792 iftable->SetInterface(i, super_interface); 4793 } 4794 } 4795 self->AllowThreadSuspension(); 4796 // Flatten the interface inheritance hierarchy. 4797 size_t idx = super_ifcount; 4798 for (size_t i = 0; i < num_interfaces; i++) { 4799 mirror::Class* interface = 4800 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4801 interfaces->Get(i); 4802 DCHECK(interface != nullptr); 4803 if (!interface->IsInterface()) { 4804 std::string temp; 4805 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4806 PrettyDescriptor(klass.Get()).c_str(), 4807 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4808 return false; 4809 } 4810 // Check if interface is already in iftable 4811 bool duplicate = false; 4812 for (size_t j = 0; j < idx; j++) { 4813 mirror::Class* existing_interface = iftable->GetInterface(j); 4814 if (existing_interface == interface) { 4815 duplicate = true; 4816 break; 4817 } 4818 } 4819 if (!duplicate) { 4820 // Add this non-duplicate interface. 4821 iftable->SetInterface(idx++, interface); 4822 // Add this interface's non-duplicate super-interfaces. 4823 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4824 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4825 bool super_duplicate = false; 4826 for (size_t k = 0; k < idx; k++) { 4827 mirror::Class* existing_interface = iftable->GetInterface(k); 4828 if (existing_interface == super_interface) { 4829 super_duplicate = true; 4830 break; 4831 } 4832 } 4833 if (!super_duplicate) { 4834 iftable->SetInterface(idx++, super_interface); 4835 } 4836 } 4837 } 4838 } 4839 self->AllowThreadSuspension(); 4840 // Shrink iftable in case duplicates were found 4841 if (idx < ifcount) { 4842 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4843 if (UNLIKELY(iftable.Get() == nullptr)) { 4844 CHECK(self->IsExceptionPending()); // OOME. 4845 return false; 4846 } 4847 ifcount = idx; 4848 } else { 4849 CHECK_EQ(idx, ifcount); 4850 } 4851 klass->SetIfTable(iftable.Get()); 4852 4853 // If we're an interface, we don't need the vtable pointers, so we're done. 4854 if (klass->IsInterface()) { 4855 return true; 4856 } 4857 self->AllowThreadSuspension(); 4858 // Allocate imtable 4859 bool imtable_changed = false; 4860 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4861 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4862 if (UNLIKELY(imtable.Get() == nullptr)) { 4863 CHECK(self->IsExceptionPending()); // OOME. 4864 return false; 4865 } 4866 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4867 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4868 size_t max_miranda_methods = 0; // The max size of miranda_list. 4869 for (size_t i = 0; i < ifcount; ++i) { 4870 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4871 } 4872 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4873 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4874 size_t miranda_list_size = 0; // The current size of miranda_list. 4875 for (size_t i = 0; i < ifcount; ++i) { 4876 self->AllowThreadSuspension(); 4877 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4878 if (num_methods > 0) { 4879 StackHandleScope<2> hs(self); 4880 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4881 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4882 if (UNLIKELY(method_array.Get() == nullptr)) { 4883 CHECK(self->IsExceptionPending()); // OOME. 4884 return false; 4885 } 4886 iftable->SetMethodArray(i, method_array.Get()); 4887 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4888 hs.NewHandle(klass->GetVTableDuringLinking())); 4889 for (size_t j = 0; j < num_methods; ++j) { 4890 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4891 int32_t k; 4892 // For each method listed in the interface's method list, find the 4893 // matching method in our class's method list. We want to favor the 4894 // subclass over the superclass, which just requires walking 4895 // back from the end of the vtable. (This only matters if the 4896 // superclass defines a private method and this class redefines 4897 // it -- otherwise it would use the same vtable slot. In .dex files 4898 // those don't end up in the virtual method table, so it shouldn't 4899 // matter which direction we go. We walk it backward anyway.) 4900 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4901 vtable_mh.ChangeMethod(vtable->Get(k)); 4902 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4903 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4904 ThrowIllegalAccessError( 4905 klass.Get(), 4906 "Method '%s' implementing interface method '%s' is not public", 4907 PrettyMethod(vtable_mh.Get()).c_str(), 4908 PrettyMethod(interface_mh.Get()).c_str()); 4909 return false; 4910 } 4911 method_array->Set<false>(j, vtable_mh.Get()); 4912 // Place method in imt if entry is empty, place conflict otherwise. 4913 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4914 if (imtable->Get(imt_index) == nullptr) { 4915 imtable->Set<false>(imt_index, vtable_mh.Get()); 4916 imtable_changed = true; 4917 } else { 4918 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4919 } 4920 break; 4921 } 4922 } 4923 if (k < 0) { 4924 StackHandleScope<1> hs(self); 4925 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4926 for (size_t l = 0; l < miranda_list_size; ++l) { 4927 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4928 DCHECK(mir_method != nullptr); 4929 vtable_mh.ChangeMethod(mir_method); 4930 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4931 miranda_method.Assign(mir_method); 4932 break; 4933 } 4934 } 4935 if (miranda_method.Get() == nullptr) { 4936 // Point the interface table at a phantom slot. 4937 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4938 if (UNLIKELY(miranda_method.Get() == nullptr)) { 4939 CHECK(self->IsExceptionPending()); // OOME. 4940 return false; 4941 } 4942 DCHECK_LT(miranda_list_size, max_miranda_methods); 4943 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4944 } 4945 method_array->Set<false>(j, miranda_method.Get()); 4946 } 4947 } 4948 } 4949 } 4950 if (imtable_changed) { 4951 // Fill in empty entries in interface method table with conflict. 4952 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4953 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4954 if (imtable->Get(i) == nullptr) { 4955 imtable->Set<false>(i, imt_conflict_method); 4956 } 4957 } 4958 klass->SetImTable(imtable.Get()); 4959 } 4960 if (miranda_list_size > 0) { 4961 int old_method_count = klass->NumVirtualMethods(); 4962 int new_method_count = old_method_count + miranda_list_size; 4963 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4964 if (old_method_count == 0) { 4965 virtuals = AllocArtMethodArray(self, new_method_count); 4966 } else { 4967 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4968 } 4969 if (UNLIKELY(virtuals == nullptr)) { 4970 CHECK(self->IsExceptionPending()); // OOME. 4971 return false; 4972 } 4973 klass->SetVirtualMethods(virtuals); 4974 4975 StackHandleScope<1> hs(self); 4976 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4977 hs.NewHandle(klass->GetVTableDuringLinking())); 4978 CHECK(vtable.Get() != nullptr); 4979 int old_vtable_count = vtable->GetLength(); 4980 int new_vtable_count = old_vtable_count + miranda_list_size; 4981 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4982 if (UNLIKELY(vtable.Get() == nullptr)) { 4983 CHECK(self->IsExceptionPending()); // OOME. 4984 return false; 4985 } 4986 for (size_t i = 0; i < miranda_list_size; ++i) { 4987 mirror::ArtMethod* method = miranda_list->Get(i); 4988 // Leave the declaring class alone as type indices are relative to it 4989 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4990 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4991 klass->SetVirtualMethod(old_method_count + i, method); 4992 vtable->Set<false>(old_vtable_count + i, method); 4993 } 4994 // TODO: do not assign to the vtable field until it is fully constructed. 4995 klass->SetVTable(vtable.Get()); 4996 } 4997 4998 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4999 for (int i = 0; i < vtable->GetLength(); ++i) { 5000 CHECK(vtable->Get(i) != nullptr); 5001 } 5002 5003 self->AllowThreadSuspension(); 5004 5005 return true; 5006} 5007 5008bool ClassLinker::LinkInstanceFields(Thread* self, ConstHandle<mirror::Class> klass) { 5009 CHECK(klass.Get() != nullptr); 5010 return LinkFields(self, klass, false, nullptr); 5011} 5012 5013bool ClassLinker::LinkStaticFields(Thread* self, ConstHandle<mirror::Class> klass, size_t* class_size) { 5014 CHECK(klass.Get() != nullptr); 5015 return LinkFields(self, klass, true, class_size); 5016} 5017 5018struct LinkFieldsComparator { 5019 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5020 } 5021 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5022 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5023 NO_THREAD_SAFETY_ANALYSIS { 5024 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5025 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5026 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5027 if (type1 != type2) { 5028 bool is_primitive1 = type1 != Primitive::kPrimNot; 5029 bool is_primitive2 = type2 != Primitive::kPrimNot; 5030 if (type1 != type2) { 5031 if (is_primitive1 && is_primitive2) { 5032 // Larger primitive types go first. 5033 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5034 } else { 5035 // Reference always goes first. 5036 return !is_primitive1; 5037 } 5038 } 5039 } 5040 // same basic group? then sort by string. 5041 return strcmp(field1->GetName(), field2->GetName()) < 0; 5042 } 5043}; 5044 5045bool ClassLinker::LinkFields(Thread* self, ConstHandle<mirror::Class> klass, bool is_static, 5046 size_t* class_size) { 5047 self->AllowThreadSuspension(); 5048 size_t num_fields = 5049 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5050 5051 mirror::ObjectArray<mirror::ArtField>* fields = 5052 is_static ? klass->GetSFields() : klass->GetIFields(); 5053 5054 // Initialize field_offset 5055 MemberOffset field_offset(0); 5056 if (is_static) { 5057 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5058 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5059 // Static fields come after the embedded tables. 5060 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5061 0, 0, 0, 0, 0); 5062 } 5063 field_offset = MemberOffset(base); 5064 } else { 5065 mirror::Class* super_class = klass->GetSuperClass(); 5066 if (super_class != nullptr) { 5067 CHECK(super_class->IsResolved()) 5068 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5069 field_offset = MemberOffset(super_class->GetObjectSize()); 5070 } 5071 } 5072 5073 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5074 5075 // we want a relatively stable order so that adding new fields 5076 // minimizes disruption of C++ version such as Class and Method. 5077 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5078 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5079 "Naked ArtField references in deque"); 5080 for (size_t i = 0; i < num_fields; i++) { 5081 mirror::ArtField* f = fields->Get(i); 5082 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5083 grouped_and_sorted_fields.push_back(f); 5084 } 5085 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5086 LinkFieldsComparator()); 5087 5088 // References should be at the front. 5089 size_t current_field = 0; 5090 size_t num_reference_fields = 0; 5091 FieldGaps gaps; 5092 5093 for (; current_field < num_fields; current_field++) { 5094 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5095 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5096 bool isPrimitive = type != Primitive::kPrimNot; 5097 if (isPrimitive) { 5098 break; // past last reference, move on to the next phase 5099 } 5100 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5101 MemberOffset old_offset = field_offset; 5102 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5103 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5104 } 5105 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5106 grouped_and_sorted_fields.pop_front(); 5107 num_reference_fields++; 5108 fields->Set<false>(current_field, field); 5109 field->SetOffset(field_offset); 5110 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5111 } 5112 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5113 // otherwise we could end up with suboptimal gap fills. 5114 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5115 fields, &grouped_and_sorted_fields, &gaps); 5116 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5117 fields, &grouped_and_sorted_fields, &gaps); 5118 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5119 fields, &grouped_and_sorted_fields, &gaps); 5120 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5121 fields, &grouped_and_sorted_fields, &gaps); 5122 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5123 " fields."; 5124 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5125 5126 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5127 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5128 // We know there are no non-reference fields in the Reference classes, and we know 5129 // that 'referent' is alphabetically last, so this is easy... 5130 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5131 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5132 --num_reference_fields; 5133 } 5134 5135 if (kIsDebugBuild) { 5136 // Make sure that all reference fields appear before 5137 // non-reference fields, and all double-wide fields are aligned. 5138 bool seen_non_ref = false; 5139 for (size_t i = 0; i < num_fields; i++) { 5140 mirror::ArtField* field = fields->Get(i); 5141 if (false) { // enable to debug field layout 5142 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5143 << " class=" << PrettyClass(klass.Get()) 5144 << " field=" << PrettyField(field) 5145 << " offset=" 5146 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5147 } 5148 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5149 bool is_primitive = type != Primitive::kPrimNot; 5150 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5151 strcmp("referent", field->GetName()) == 0) { 5152 is_primitive = true; // We lied above, so we have to expect a lie here. 5153 } 5154 if (is_primitive) { 5155 if (!seen_non_ref) { 5156 seen_non_ref = true; 5157 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5158 } 5159 } else { 5160 DCHECK(!seen_non_ref) << PrettyField(field); 5161 } 5162 } 5163 if (!seen_non_ref) { 5164 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5165 } 5166 } 5167 5168 size_t size = field_offset.Uint32Value(); 5169 // Update klass 5170 if (is_static) { 5171 klass->SetNumReferenceStaticFields(num_reference_fields); 5172 *class_size = size; 5173 } else { 5174 klass->SetNumReferenceInstanceFields(num_reference_fields); 5175 if (!klass->IsVariableSize()) { 5176 std::string temp; 5177 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5178 size_t previous_size = klass->GetObjectSize(); 5179 if (previous_size != 0) { 5180 // Make sure that we didn't originally have an incorrect size. 5181 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5182 } 5183 klass->SetObjectSize(size); 5184 } 5185 } 5186 return true; 5187} 5188 5189// Set the bitmap of reference offsets, refOffsets, from the ifields 5190// list. 5191void ClassLinker::CreateReferenceInstanceOffsets(ConstHandle<mirror::Class> klass) { 5192 uint32_t reference_offsets = 0; 5193 mirror::Class* super_class = klass->GetSuperClass(); 5194 if (super_class != nullptr) { 5195 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5196 // If our superclass overflowed, we don't stand a chance. 5197 if (reference_offsets == CLASS_WALK_SUPER) { 5198 klass->SetReferenceInstanceOffsets(reference_offsets); 5199 return; 5200 } 5201 } 5202 CreateReferenceOffsets(klass, reference_offsets); 5203} 5204 5205void ClassLinker::CreateReferenceOffsets(ConstHandle<mirror::Class> klass, 5206 uint32_t reference_offsets) { 5207 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5208 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5209 // All of the fields that contain object references are guaranteed 5210 // to be at the beginning of the fields list. 5211 for (size_t i = 0; i < num_reference_fields; ++i) { 5212 // Note that byte_offset is the offset from the beginning of 5213 // object, not the offset into instance data 5214 mirror::ArtField* field = fields->Get(i); 5215 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5216 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5217 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5218 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5219 CHECK_NE(new_bit, 0U); 5220 reference_offsets |= new_bit; 5221 } else { 5222 reference_offsets = CLASS_WALK_SUPER; 5223 break; 5224 } 5225 } 5226 klass->SetReferenceInstanceOffsets(reference_offsets); 5227} 5228 5229mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5230 ConstHandle<mirror::DexCache> dex_cache) { 5231 DCHECK(dex_cache.Get() != nullptr); 5232 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5233 if (resolved != nullptr) { 5234 return resolved; 5235 } 5236 uint32_t utf16_length; 5237 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5238 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5239 dex_cache->SetResolvedString(string_idx, string); 5240 return string; 5241} 5242 5243mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5244 mirror::Class* referrer) { 5245 StackHandleScope<2> hs(Thread::Current()); 5246 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5247 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5248 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5249} 5250 5251mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5252 ConstHandle<mirror::DexCache> dex_cache, 5253 ConstHandle<mirror::ClassLoader> class_loader) { 5254 DCHECK(dex_cache.Get() != nullptr); 5255 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5256 if (resolved == nullptr) { 5257 Thread* self = Thread::Current(); 5258 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5259 resolved = FindClass(self, descriptor, class_loader); 5260 if (resolved != nullptr) { 5261 // TODO: we used to throw here if resolved's class loader was not the 5262 // boot class loader. This was to permit different classes with the 5263 // same name to be loaded simultaneously by different loaders 5264 dex_cache->SetResolvedType(type_idx, resolved); 5265 } else { 5266 CHECK(self->IsExceptionPending()) 5267 << "Expected pending exception for failed resolution of: " << descriptor; 5268 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5269 StackHandleScope<1> hs(self); 5270 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5271 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5272 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5273 self->ClearException(); 5274 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5275 self->GetException(nullptr)->SetCause(cause.Get()); 5276 } 5277 } 5278 } 5279 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5280 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5281 return resolved; 5282} 5283 5284mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5285 ConstHandle<mirror::DexCache> dex_cache, 5286 ConstHandle<mirror::ClassLoader> class_loader, 5287 ConstHandle<mirror::ArtMethod> referrer, 5288 InvokeType type) { 5289 DCHECK(dex_cache.Get() != nullptr); 5290 // Check for hit in the dex cache. 5291 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5292 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5293 return resolved; 5294 } 5295 // Fail, get the declaring class. 5296 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5297 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5298 if (klass == nullptr) { 5299 DCHECK(Thread::Current()->IsExceptionPending()); 5300 return nullptr; 5301 } 5302 // Scan using method_idx, this saves string compares but will only hit for matching dex 5303 // caches/files. 5304 switch (type) { 5305 case kDirect: // Fall-through. 5306 case kStatic: 5307 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5308 break; 5309 case kInterface: 5310 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5311 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5312 break; 5313 case kSuper: // Fall-through. 5314 case kVirtual: 5315 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5316 break; 5317 default: 5318 LOG(FATAL) << "Unreachable - invocation type: " << type; 5319 } 5320 if (resolved == nullptr) { 5321 // Search by name, which works across dex files. 5322 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5323 const Signature signature = dex_file.GetMethodSignature(method_id); 5324 switch (type) { 5325 case kDirect: // Fall-through. 5326 case kStatic: 5327 resolved = klass->FindDirectMethod(name, signature); 5328 break; 5329 case kInterface: 5330 resolved = klass->FindInterfaceMethod(name, signature); 5331 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5332 break; 5333 case kSuper: // Fall-through. 5334 case kVirtual: 5335 resolved = klass->FindVirtualMethod(name, signature); 5336 break; 5337 } 5338 } 5339 // If we found a method, check for incompatible class changes. 5340 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5341 // Be a good citizen and update the dex cache to speed subsequent calls. 5342 dex_cache->SetResolvedMethod(method_idx, resolved); 5343 return resolved; 5344 } else { 5345 // If we had a method, it's an incompatible-class-change error. 5346 if (resolved != nullptr) { 5347 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5348 } else { 5349 // We failed to find the method which means either an access error, an incompatible class 5350 // change, or no such method. First try to find the method among direct and virtual methods. 5351 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5352 const Signature signature = dex_file.GetMethodSignature(method_id); 5353 switch (type) { 5354 case kDirect: 5355 case kStatic: 5356 resolved = klass->FindVirtualMethod(name, signature); 5357 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5358 // have had a resolved method before, which triggers the "true" branch above. 5359 break; 5360 case kInterface: 5361 case kVirtual: 5362 case kSuper: 5363 resolved = klass->FindDirectMethod(name, signature); 5364 break; 5365 } 5366 5367 // If we found something, check that it can be accessed by the referrer. 5368 if (resolved != nullptr && referrer.Get() != nullptr) { 5369 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5370 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5371 if (!referring_class->CanAccess(methods_class)) { 5372 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5373 resolved, type); 5374 return nullptr; 5375 } else if (!referring_class->CanAccessMember(methods_class, 5376 resolved->GetAccessFlags())) { 5377 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5378 return nullptr; 5379 } 5380 } 5381 5382 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5383 // methods and throw if we find the method there. If we find nothing, throw a 5384 // NoSuchMethodError. 5385 switch (type) { 5386 case kDirect: 5387 case kStatic: 5388 if (resolved != nullptr) { 5389 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5390 } else { 5391 resolved = klass->FindInterfaceMethod(name, signature); 5392 if (resolved != nullptr) { 5393 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5394 } else { 5395 ThrowNoSuchMethodError(type, klass, name, signature); 5396 } 5397 } 5398 break; 5399 case kInterface: 5400 if (resolved != nullptr) { 5401 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5402 } else { 5403 resolved = klass->FindVirtualMethod(name, signature); 5404 if (resolved != nullptr) { 5405 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5406 } else { 5407 ThrowNoSuchMethodError(type, klass, name, signature); 5408 } 5409 } 5410 break; 5411 case kSuper: 5412 if (resolved != nullptr) { 5413 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5414 } else { 5415 ThrowNoSuchMethodError(type, klass, name, signature); 5416 } 5417 break; 5418 case kVirtual: 5419 if (resolved != nullptr) { 5420 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5421 } else { 5422 resolved = klass->FindInterfaceMethod(name, signature); 5423 if (resolved != nullptr) { 5424 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5425 } else { 5426 ThrowNoSuchMethodError(type, klass, name, signature); 5427 } 5428 } 5429 break; 5430 } 5431 } 5432 DCHECK(Thread::Current()->IsExceptionPending()); 5433 return nullptr; 5434 } 5435} 5436 5437mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5438 ConstHandle<mirror::DexCache> dex_cache, 5439 ConstHandle<mirror::ClassLoader> class_loader, 5440 bool is_static) { 5441 DCHECK(dex_cache.Get() != nullptr); 5442 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5443 if (resolved != nullptr) { 5444 return resolved; 5445 } 5446 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5447 Thread* const self = Thread::Current(); 5448 StackHandleScope<1> hs(self); 5449 Handle<mirror::Class> klass( 5450 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5451 if (klass.Get() == nullptr) { 5452 DCHECK(Thread::Current()->IsExceptionPending()); 5453 return nullptr; 5454 } 5455 5456 if (is_static) { 5457 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5458 } else { 5459 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5460 } 5461 5462 if (resolved == nullptr) { 5463 const char* name = dex_file.GetFieldName(field_id); 5464 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5465 if (is_static) { 5466 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5467 } else { 5468 resolved = klass->FindInstanceField(name, type); 5469 } 5470 if (resolved == nullptr) { 5471 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5472 return nullptr; 5473 } 5474 } 5475 dex_cache->SetResolvedField(field_idx, resolved); 5476 return resolved; 5477} 5478 5479mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5480 uint32_t field_idx, 5481 ConstHandle<mirror::DexCache> dex_cache, 5482 ConstHandle<mirror::ClassLoader> class_loader) { 5483 DCHECK(dex_cache.Get() != nullptr); 5484 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5485 if (resolved != nullptr) { 5486 return resolved; 5487 } 5488 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5489 Thread* self = Thread::Current(); 5490 StackHandleScope<1> hs(self); 5491 Handle<mirror::Class> klass( 5492 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5493 if (klass.Get() == nullptr) { 5494 DCHECK(Thread::Current()->IsExceptionPending()); 5495 return nullptr; 5496 } 5497 5498 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5499 StringPiece type(dex_file.StringDataByIdx( 5500 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5501 resolved = mirror::Class::FindField(self, klass, name, type); 5502 if (resolved != nullptr) { 5503 dex_cache->SetResolvedField(field_idx, resolved); 5504 } else { 5505 ThrowNoSuchFieldError("", klass.Get(), type, name); 5506 } 5507 return resolved; 5508} 5509 5510const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5511 uint32_t* length) { 5512 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5513 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5514 const DexFile& dex_file = *dex_cache->GetDexFile(); 5515 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5516 return dex_file.GetMethodShorty(method_id, length); 5517} 5518 5519void ClassLinker::DumpAllClasses(int flags) { 5520 if (dex_cache_image_class_lookup_required_) { 5521 MoveImageClassesToClassTable(); 5522 } 5523 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5524 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5525 std::vector<mirror::Class*> all_classes; 5526 { 5527 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5528 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5529 mirror::Class* klass = it.second.Read(); 5530 all_classes.push_back(klass); 5531 } 5532 } 5533 5534 for (size_t i = 0; i < all_classes.size(); ++i) { 5535 all_classes[i]->DumpClass(std::cerr, flags); 5536 } 5537} 5538 5539void ClassLinker::DumpForSigQuit(std::ostream& os) { 5540 Thread* self = Thread::Current(); 5541 if (dex_cache_image_class_lookup_required_) { 5542 ScopedObjectAccess soa(self); 5543 MoveImageClassesToClassTable(); 5544 } 5545 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5546 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5547} 5548 5549size_t ClassLinker::NumLoadedClasses() { 5550 if (dex_cache_image_class_lookup_required_) { 5551 MoveImageClassesToClassTable(); 5552 } 5553 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5554 return class_table_.size(); 5555} 5556 5557pid_t ClassLinker::GetClassesLockOwner() { 5558 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5559} 5560 5561pid_t ClassLinker::GetDexLockOwner() { 5562 return dex_lock_.GetExclusiveOwnerTid(); 5563} 5564 5565void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5566 DCHECK(!init_done_); 5567 5568 DCHECK(klass != nullptr); 5569 DCHECK(klass->GetClassLoader() == nullptr); 5570 5571 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5572 DCHECK(class_roots != nullptr); 5573 DCHECK(class_roots->Get(class_root) == nullptr); 5574 class_roots->Set<false>(class_root, klass); 5575} 5576 5577} // namespace art 5578