class_linker.cc revision 7adb7ac3913364de8cc57b8934024dd12e1d3bea
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <memory> 21#include <queue> 22#include <string> 23#include <utility> 24#include <vector> 25 26#include "base/casts.h" 27#include "base/logging.h" 28#include "base/scoped_flock.h" 29#include "base/stl_util.h" 30#include "base/unix_file/fd_file.h" 31#include "class_linker-inl.h" 32#include "compiler_callbacks.h" 33#include "debugger.h" 34#include "dex_file-inl.h" 35#include "gc_root-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "method_helper-inl.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "object_lock.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/dex_cache-inl.h" 54#include "mirror/iftable-inl.h" 55#include "mirror/object-inl.h" 56#include "mirror/object_array-inl.h" 57#include "mirror/proxy.h" 58#include "mirror/reference-inl.h" 59#include "mirror/stack_trace_element.h" 60#include "mirror/string-inl.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 std::string temp; 102 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 103 PrettyDescriptor(c).c_str()); 104 } else { 105 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 106 PrettyDescriptor(c).c_str()); 107 } 108} 109 110static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 111 Thread* self = Thread::Current(); 112 JNIEnv* env = self->GetJniEnv(); 113 114 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 115 CHECK(cause.get() != NULL); 116 117 env->ExceptionClear(); 118 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 119 env->Throw(cause.get()); 120 121 // We only wrap non-Error exceptions; an Error can just be used as-is. 122 if (!is_error) { 123 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 124 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 125 } 126} 127 128static size_t Hash(const char* s) { 129 // This is the java.lang.String hashcode for convenience, not interoperability. 130 size_t hash = 0; 131 for (; *s != '\0'; ++s) { 132 hash = hash * 31 + *s; 133 } 134 return hash; 135} 136 137// Gap between two fields in object layout. 138struct FieldGap { 139 uint32_t start_offset; // The offset from the start of the object. 140 uint32_t size; // The gap size of 1, 2, or 4 bytes. 141}; 142struct FieldGapsComparator { 143 explicit FieldGapsComparator() { 144 } 145 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 146 NO_THREAD_SAFETY_ANALYSIS { 147 // Sort by gap size, largest first. 148 return lhs.size > rhs.size; 149 } 150}; 151typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 152 153// Adds largest aligned gaps to queue of gaps. 154void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 155 DCHECK(gaps != nullptr); 156 157 uint32_t current_offset = gap_start; 158 while (current_offset != gap_end) { 159 size_t remaining = gap_end - current_offset; 160 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 161 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 162 current_offset += sizeof(uint32_t); 163 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 164 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 165 current_offset += sizeof(uint16_t); 166 } else { 167 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 168 current_offset += sizeof(uint8_t); 169 } 170 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 171 } 172} 173// Shuffle fields forward, making use of gaps whenever possible. 174template<int n> 175static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 176 MemberOffset* field_offset, 177 mirror::ObjectArray<mirror::ArtField>* fields, 178 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 179 FieldGaps* gaps) 180 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 181 DCHECK(current_field_idx != nullptr); 182 DCHECK(grouped_and_sorted_fields != nullptr); 183 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 184 DCHECK(gaps != nullptr); 185 DCHECK(field_offset != nullptr); 186 187 DCHECK(IsPowerOfTwo(n)); 188 while (!grouped_and_sorted_fields->empty()) { 189 mirror::ArtField* field = grouped_and_sorted_fields->front(); 190 Primitive::Type type = field->GetTypeAsPrimitiveType(); 191 if (Primitive::ComponentSize(type) < n) { 192 break; 193 } 194 if (!IsAligned<n>(field_offset->Uint32Value())) { 195 MemberOffset old_offset = *field_offset; 196 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 197 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 198 } 199 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 200 grouped_and_sorted_fields->pop_front(); 201 fields->Set<false>(*current_field_idx, field); 202 if (!gaps->empty() && gaps->top().size >= n) { 203 FieldGap gap = gaps->top(); 204 gaps->pop(); 205 DCHECK(IsAligned<n>(gap.start_offset)); 206 field->SetOffset(MemberOffset(gap.start_offset)); 207 if (gap.size > n) { 208 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 209 } 210 } else { 211 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 212 field->SetOffset(*field_offset); 213 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 214 } 215 ++(*current_field_idx); 216 } 217} 218 219const char* ClassLinker::class_roots_descriptors_[] = { 220 "Ljava/lang/Class;", 221 "Ljava/lang/Object;", 222 "[Ljava/lang/Class;", 223 "[Ljava/lang/Object;", 224 "Ljava/lang/String;", 225 "Ljava/lang/DexCache;", 226 "Ljava/lang/ref/Reference;", 227 "Ljava/lang/reflect/ArtField;", 228 "Ljava/lang/reflect/ArtMethod;", 229 "Ljava/lang/reflect/Proxy;", 230 "[Ljava/lang/String;", 231 "[Ljava/lang/reflect/ArtField;", 232 "[Ljava/lang/reflect/ArtMethod;", 233 "Ljava/lang/ClassLoader;", 234 "Ljava/lang/Throwable;", 235 "Ljava/lang/ClassNotFoundException;", 236 "Ljava/lang/StackTraceElement;", 237 "Z", 238 "B", 239 "C", 240 "D", 241 "F", 242 "I", 243 "J", 244 "S", 245 "V", 246 "[Z", 247 "[B", 248 "[C", 249 "[D", 250 "[F", 251 "[I", 252 "[J", 253 "[S", 254 "[Ljava/lang/StackTraceElement;", 255}; 256 257ClassLinker::ClassLinker(InternTable* intern_table) 258 // dex_lock_ is recursive as it may be used in stack dumping. 259 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 260 dex_cache_image_class_lookup_required_(false), 261 failed_dex_cache_class_lookups_(0), 262 class_roots_(nullptr), 263 array_iftable_(nullptr), 264 find_array_class_cache_next_victim_(0), 265 init_done_(false), 266 log_new_dex_caches_roots_(false), 267 log_new_class_table_roots_(false), 268 intern_table_(intern_table), 269 portable_resolution_trampoline_(nullptr), 270 quick_resolution_trampoline_(nullptr), 271 portable_imt_conflict_trampoline_(nullptr), 272 quick_imt_conflict_trampoline_(nullptr), 273 quick_generic_jni_trampoline_(nullptr), 274 quick_to_interpreter_bridge_trampoline_(nullptr) { 275 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 276 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 277} 278 279// To set a value for generic JNI. May be necessary in compiler tests. 280extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 281extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 282extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 283extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 284 285void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 286 VLOG(startup) << "ClassLinker::Init"; 287 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 288 289 CHECK(!init_done_); 290 291 // java_lang_Class comes first, it's needed for AllocClass 292 Thread* self = Thread::Current(); 293 gc::Heap* heap = Runtime::Current()->GetHeap(); 294 // The GC can't handle an object with a null class since we can't get the size of this object. 295 heap->IncrementDisableMovingGC(self); 296 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 297 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 298 heap->AllocNonMovableObject<true>(self, nullptr, 299 mirror::Class::ClassClassSize(), 300 VoidFunctor())))); 301 CHECK(java_lang_Class.Get() != NULL); 302 mirror::Class::SetClassClass(java_lang_Class.Get()); 303 java_lang_Class->SetClass(java_lang_Class.Get()); 304 if (kUseBakerOrBrooksReadBarrier) { 305 java_lang_Class->AssertReadBarrierPointer(); 306 } 307 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 308 heap->DecrementDisableMovingGC(self); 309 // AllocClass(mirror::Class*) can now be used 310 311 // Class[] is used for reflection support. 312 Handle<mirror::Class> class_array_class(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 314 class_array_class->SetComponentType(java_lang_Class.Get()); 315 316 // java_lang_Object comes next so that object_array_class can be created. 317 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 318 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 319 CHECK(java_lang_Object.Get() != NULL); 320 // backfill Object as the super class of Class. 321 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 322 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 323 324 // Object[] next to hold class roots. 325 Handle<mirror::Class> object_array_class(hs.NewHandle( 326 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 327 object_array_class->SetComponentType(java_lang_Object.Get()); 328 329 // Setup the char (primitive) class to be used for char[]. 330 Handle<mirror::Class> char_class(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 332 333 // Setup the char[] class to be used for String. 334 Handle<mirror::Class> char_array_class(hs.NewHandle( 335 AllocClass(self, java_lang_Class.Get(), 336 mirror::Array::ClassSize()))); 337 char_array_class->SetComponentType(char_class.Get()); 338 mirror::CharArray::SetArrayClass(char_array_class.Get()); 339 340 // Setup String. 341 Handle<mirror::Class> java_lang_String(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 343 mirror::String::SetClass(java_lang_String.Get()); 344 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 345 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 346 347 // Setup Reference. 348 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 350 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 351 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 352 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 353 354 // Create storage for root classes, save away our work so far (requires descriptors). 355 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 356 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 357 kClassRootsMax)); 358 CHECK(!class_roots_.IsNull()); 359 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 360 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 361 SetClassRoot(kClassArrayClass, class_array_class.Get()); 362 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 363 SetClassRoot(kCharArrayClass, char_array_class.Get()); 364 SetClassRoot(kJavaLangString, java_lang_String.Get()); 365 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 366 367 // Setup the primitive type classes. 368 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 369 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 370 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 371 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 372 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 373 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 374 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 375 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 376 377 // Create array interface entries to populate once we can load system classes. 378 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 379 380 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 381 Handle<mirror::Class> int_array_class(hs.NewHandle( 382 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 383 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 384 mirror::IntArray::SetArrayClass(int_array_class.Get()); 385 SetClassRoot(kIntArrayClass, int_array_class.Get()); 386 387 // now that these are registered, we can use AllocClass() and AllocObjectArray 388 389 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 390 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 392 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 393 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 394 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 395 396 // Constructor, Field, Method, and AbstractMethod are necessary so 397 // that FindClass can link members. 398 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 399 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 400 CHECK(java_lang_reflect_ArtField.Get() != NULL); 401 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 402 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 403 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 404 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 405 406 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 408 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 409 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 410 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 411 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 412 413 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 414 415 // Set up array classes for string, field, method 416 Handle<mirror::Class> object_array_string(hs.NewHandle( 417 AllocClass(self, java_lang_Class.Get(), 418 mirror::ObjectArray<mirror::String>::ClassSize()))); 419 object_array_string->SetComponentType(java_lang_String.Get()); 420 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 421 422 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 423 AllocClass(self, java_lang_Class.Get(), 424 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 425 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 426 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 427 428 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 429 AllocClass(self, java_lang_Class.Get(), 430 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 431 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 432 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 433 434 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 435 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 436 // these roots. 437 CHECK_NE(0U, boot_class_path.size()); 438 for (size_t i = 0; i != boot_class_path.size(); ++i) { 439 const DexFile* dex_file = boot_class_path[i]; 440 CHECK(dex_file != NULL); 441 AppendToBootClassPath(*dex_file); 442 } 443 444 // now we can use FindSystemClass 445 446 // run char class through InitializePrimitiveClass to finish init 447 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 448 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 449 450 // Create runtime resolution and imt conflict methods. Also setup the default imt. 451 Runtime* runtime = Runtime::Current(); 452 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 453 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 454 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 455 456 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 457 // we do not need friend classes or a publicly exposed setter. 458 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 459 if (!runtime->IsCompiler()) { 460 // We need to set up the generic trampolines since we don't have an image. 461 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 462 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 463 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 464 } 465 466 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 467 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 468 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 469 CHECK_EQ(java_lang_Object.Get(), Object_class); 470 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 471 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 472 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 473 std::ostringstream os1, os2; 474 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 475 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 476 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 477 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 478 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 479 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 480 CHECK_EQ(java_lang_String.Get(), String_class); 481 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 482 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 483 484 // Setup the primitive array type classes - can't be done until Object has a vtable. 485 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 486 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 487 488 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 489 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 490 491 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 492 CHECK_EQ(char_array_class.Get(), found_char_array_class); 493 494 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 495 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 496 497 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 498 CHECK_EQ(int_array_class.Get(), found_int_array_class); 499 500 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 501 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 502 503 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 504 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 505 506 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 507 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 508 509 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 510 CHECK_EQ(class_array_class.Get(), found_class_array_class); 511 512 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 513 CHECK_EQ(object_array_class.Get(), found_object_array_class); 514 515 // Setup the single, global copy of "iftable". 516 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 517 CHECK(java_lang_Cloneable != NULL); 518 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 519 CHECK(java_io_Serializable != NULL); 520 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 521 // crawl up and explicitly list all of the supers as well. 522 { 523 mirror::IfTable* array_iftable = array_iftable_.Read(); 524 array_iftable->SetInterface(0, java_lang_Cloneable); 525 array_iftable->SetInterface(1, java_io_Serializable); 526 } 527 528 // Sanity check Class[] and Object[]'s interfaces. 529 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 530 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 531 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 532 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 533 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 534 // dex_cache_ fields and register them in class_table_. 535 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 536 CHECK_EQ(java_lang_Class.Get(), Class_class); 537 538 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 539 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 540 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 541 542 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 543 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 544 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 545 546 mirror::Class* String_array_class = 547 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 548 CHECK_EQ(object_array_string.Get(), String_array_class); 549 550 mirror::Class* Art_method_array_class = 551 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 552 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 553 554 mirror::Class* Art_field_array_class = 555 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 556 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 557 558 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 559 560 // Create java.lang.reflect.Proxy root. 561 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 562 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 563 564 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 565 // finish initializing Reference class 566 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 567 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 568 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 569 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 570 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 571 mirror::Class* java_lang_ref_FinalizerReference = 572 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 573 java_lang_ref_FinalizerReference->SetAccessFlags( 574 java_lang_ref_FinalizerReference->GetAccessFlags() | 575 kAccClassIsReference | kAccClassIsFinalizerReference); 576 mirror::Class* java_lang_ref_PhantomReference = 577 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 578 java_lang_ref_PhantomReference->SetAccessFlags( 579 java_lang_ref_PhantomReference->GetAccessFlags() | 580 kAccClassIsReference | kAccClassIsPhantomReference); 581 mirror::Class* java_lang_ref_SoftReference = 582 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 583 java_lang_ref_SoftReference->SetAccessFlags( 584 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 585 mirror::Class* java_lang_ref_WeakReference = 586 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 587 java_lang_ref_WeakReference->SetAccessFlags( 588 java_lang_ref_WeakReference->GetAccessFlags() | 589 kAccClassIsReference | kAccClassIsWeakReference); 590 591 // Setup the ClassLoader, verifying the object_size_. 592 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 593 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 594 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 595 596 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 597 // java.lang.StackTraceElement as a convenience. 598 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 599 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 600 SetClassRoot(kJavaLangClassNotFoundException, 601 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 602 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 603 SetClassRoot(kJavaLangStackTraceElementArrayClass, 604 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 605 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 606 607 FinishInit(self); 608 609 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 610} 611 612void ClassLinker::FinishInit(Thread* self) { 613 VLOG(startup) << "ClassLinker::FinishInit entering"; 614 615 // Let the heap know some key offsets into java.lang.ref instances 616 // Note: we hard code the field indexes here rather than using FindInstanceField 617 // as the types of the field can't be resolved prior to the runtime being 618 // fully initialized 619 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 620 mirror::Class* java_lang_ref_FinalizerReference = 621 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 622 623 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 624 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 625 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 626 627 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 628 CHECK_STREQ(queue->GetName(), "queue"); 629 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 630 631 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 632 CHECK_STREQ(queueNext->GetName(), "queueNext"); 633 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 634 635 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 636 CHECK_STREQ(referent->GetName(), "referent"); 637 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 638 639 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 640 CHECK_STREQ(zombie->GetName(), "zombie"); 641 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 642 643 // ensure all class_roots_ are initialized 644 for (size_t i = 0; i < kClassRootsMax; i++) { 645 ClassRoot class_root = static_cast<ClassRoot>(i); 646 mirror::Class* klass = GetClassRoot(class_root); 647 CHECK(klass != NULL); 648 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 649 // note SetClassRoot does additional validation. 650 // if possible add new checks there to catch errors early 651 } 652 653 CHECK(!array_iftable_.IsNull()); 654 655 // disable the slow paths in FindClass and CreatePrimitiveClass now 656 // that Object, Class, and Object[] are setup 657 init_done_ = true; 658 659 VLOG(startup) << "ClassLinker::FinishInit exiting"; 660} 661 662void ClassLinker::RunRootClinits() { 663 Thread* self = Thread::Current(); 664 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 665 mirror::Class* c = GetClassRoot(ClassRoot(i)); 666 if (!c->IsArrayClass() && !c->IsPrimitive()) { 667 StackHandleScope<1> hs(self); 668 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 669 EnsureInitialized(h_class, true, true); 670 self->AssertNoPendingException(); 671 } 672 } 673} 674 675bool ClassLinker::GenerateOatFile(const char* dex_filename, 676 int oat_fd, 677 const char* oat_cache_filename, 678 std::string* error_msg) { 679 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 680 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 681 682 gc::Heap* heap = Runtime::Current()->GetHeap(); 683 std::string boot_image_option("--boot-image="); 684 if (heap->GetImageSpace() == nullptr) { 685 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 686 // out of space anyway it might not matter. 687 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 688 "without an image.", dex_filename); 689 return false; 690 } 691 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 692 693 std::string dex_file_option("--dex-file="); 694 dex_file_option += dex_filename; 695 696 std::string oat_fd_option("--oat-fd="); 697 StringAppendF(&oat_fd_option, "%d", oat_fd); 698 699 std::string oat_location_option("--oat-location="); 700 oat_location_option += oat_cache_filename; 701 702 std::vector<std::string> argv; 703 argv.push_back(dex2oat); 704 argv.push_back("--runtime-arg"); 705 argv.push_back("-classpath"); 706 argv.push_back("--runtime-arg"); 707 argv.push_back(Runtime::Current()->GetClassPathString()); 708 709 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 710 711 if (!Runtime::Current()->IsVerificationEnabled()) { 712 argv.push_back("--compiler-filter=verify-none"); 713 } 714 715 if (Runtime::Current()->MustRelocateIfPossible()) { 716 argv.push_back("--runtime-arg"); 717 argv.push_back("-Xrelocate"); 718 } else { 719 argv.push_back("--runtime-arg"); 720 argv.push_back("-Xnorelocate"); 721 } 722 723 if (!kIsTargetBuild) { 724 argv.push_back("--host"); 725 } 726 727 argv.push_back(boot_image_option); 728 argv.push_back(dex_file_option); 729 argv.push_back(oat_fd_option); 730 argv.push_back(oat_location_option); 731 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 732 for (size_t i = 0; i < compiler_options.size(); ++i) { 733 argv.push_back(compiler_options[i].c_str()); 734 } 735 736 return Exec(argv, error_msg); 737} 738 739const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 740 WriterMutexLock mu(Thread::Current(), dex_lock_); 741 if (kIsDebugBuild) { 742 for (size_t i = 0; i < oat_files_.size(); ++i) { 743 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 744 } 745 } 746 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 747 oat_files_.push_back(oat_file); 748 return oat_file; 749} 750 751OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 752 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 753 OatFile* oat_file = space->ReleaseOatFile(); 754 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 755 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 756 return *oat_file; 757} 758 759const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 760 const char* dex_location = dex_file.GetLocation().c_str(); 761 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 762 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 763} 764 765const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 766 const uint32_t* const dex_location_checksum) { 767 ReaderMutexLock mu(Thread::Current(), dex_lock_); 768 for (size_t i = 0; i < oat_files_.size(); i++) { 769 const OatFile* oat_file = oat_files_[i]; 770 DCHECK(oat_file != NULL); 771 772 if (oat_location != nullptr) { 773 if (oat_file->GetLocation() != oat_location) { 774 continue; 775 } 776 } 777 778 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 779 dex_location_checksum, 780 false); 781 if (oat_dex_file != NULL) { 782 return oat_file; 783 } 784 } 785 return NULL; 786} 787 788static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 789 bool generated, 790 std::vector<std::string>* error_msgs, 791 std::vector<const DexFile*>* dex_files) { 792 if (oat_file == nullptr) { 793 return false; 794 } 795 796 size_t old_size = dex_files->size(); // To rollback on error. 797 798 bool success = true; 799 for (size_t i = 0; success; ++i) { 800 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 801 const char* next_name = next_name_str.c_str(); 802 803 uint32_t dex_location_checksum; 804 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 805 std::string error_msg; 806 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 807 DCHECK_EQ(false, i == 0 && generated); 808 dex_location_checksum_pointer = nullptr; 809 } 810 811 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 812 813 if (oat_dex_file == nullptr) { 814 if (i == 0 && generated) { 815 std::string error_msg; 816 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 817 " file'%s'", dex_location, dex_location_checksum, 818 oat_file->GetLocation().c_str()); 819 error_msgs->push_back(error_msg); 820 } 821 break; // Not found, done. 822 } 823 824 // Checksum test. Test must succeed when generated. 825 success = !generated; 826 if (dex_location_checksum_pointer != nullptr) { 827 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 828 } 829 830 if (success) { 831 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 832 if (dex_file == nullptr) { 833 success = false; 834 error_msgs->push_back(error_msg); 835 } else { 836 dex_files->push_back(dex_file); 837 } 838 } 839 840 // When we generated the file, we expect success, or something is terribly wrong. 841 CHECK_EQ(false, generated && !success) 842 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 843 << std::hex << " dex_location_checksum=" << dex_location_checksum 844 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 845 } 846 847 if (dex_files->size() == old_size) { 848 success = false; // We did not even find classes.dex 849 } 850 851 if (success) { 852 return true; 853 } else { 854 // Free all the dex files we have loaded. 855 auto it = dex_files->begin() + old_size; 856 auto it_end = dex_files->end(); 857 for (; it != it_end; it++) { 858 delete *it; 859 } 860 dex_files->erase(dex_files->begin() + old_size, it_end); 861 862 return false; 863 } 864} 865 866// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 867// complicates the loading process, as we should not use an iterative loading process, because that 868// would register the oat file and dex files that come before the broken one. Instead, check all 869// multidex ahead of time. 870bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 871 std::vector<std::string>* error_msgs, 872 std::vector<const DexFile*>* dex_files) { 873 // 1) Check whether we have an open oat file. 874 // This requires a dex checksum, use the "primary" one. 875 uint32_t dex_location_checksum; 876 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 877 bool have_checksum = true; 878 std::string checksum_error_msg; 879 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 880 dex_location_checksum_pointer = nullptr; 881 have_checksum = false; 882 } 883 884 bool needs_registering = false; 885 886 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 887 dex_location_checksum_pointer)); 888 889 // 2) If we do not have an open one, maybe there's one on disk already. 890 891 // In case the oat file is not open, we play a locking game here so 892 // that if two different processes race to load and register or generate 893 // (or worse, one tries to open a partial generated file) we will be okay. 894 // This is actually common with apps that use DexClassLoader to work 895 // around the dex method reference limit and that have a background 896 // service running in a separate process. 897 ScopedFlock scoped_flock; 898 899 if (open_oat_file.get() == nullptr) { 900 if (oat_location != nullptr) { 901 // Can only do this if we have a checksum, else error. 902 if (!have_checksum) { 903 error_msgs->push_back(checksum_error_msg); 904 return false; 905 } 906 907 std::string error_msg; 908 909 // We are loading or creating one in the future. Time to set up the file lock. 910 if (!scoped_flock.Init(oat_location, &error_msg)) { 911 error_msgs->push_back(error_msg); 912 return false; 913 } 914 915 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 916 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 917 oat_location, &error_msg)); 918 919 if (open_oat_file.get() == nullptr) { 920 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 921 dex_location, oat_location, error_msg.c_str()); 922 VLOG(class_linker) << compound_msg; 923 error_msgs->push_back(compound_msg); 924 } 925 } else { 926 // TODO: What to lock here? 927 bool obsolete_file_cleanup_failed; 928 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 929 dex_location_checksum_pointer, 930 kRuntimeISA, error_msgs, 931 &obsolete_file_cleanup_failed)); 932 // There's no point in going forward and eventually try to regenerate the 933 // file if we couldn't remove the obsolete one. Mostly likely we will fail 934 // with the same error when trying to write the new file. 935 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 936 if (obsolete_file_cleanup_failed) { 937 return false; 938 } 939 } 940 needs_registering = true; 941 } 942 943 // 3) If we have an oat file, check all contained multidex files for our dex_location. 944 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 945 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 946 dex_files); 947 if (success) { 948 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 949 if (needs_registering) { 950 // We opened the oat file, so we must register it. 951 RegisterOatFile(oat_file); 952 } 953 // If the file isn't executable we failed patchoat but did manage to get the dex files. 954 return oat_file->IsExecutable(); 955 } else { 956 if (needs_registering) { 957 // We opened it, delete it. 958 open_oat_file.reset(); 959 } else { 960 open_oat_file.release(); // Do not delete open oat files. 961 } 962 } 963 964 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 965 966 // Need a checksum, fail else. 967 if (!have_checksum) { 968 error_msgs->push_back(checksum_error_msg); 969 return false; 970 } 971 972 // Look in cache location if no oat_location is given. 973 std::string cache_location; 974 if (oat_location == nullptr) { 975 // Use the dalvik cache. 976 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 977 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 978 oat_location = cache_location.c_str(); 979 } 980 981 bool has_flock = true; 982 // Definitely need to lock now. 983 if (!scoped_flock.HasFile()) { 984 std::string error_msg; 985 if (!scoped_flock.Init(oat_location, &error_msg)) { 986 error_msgs->push_back(error_msg); 987 has_flock = false; 988 } 989 } 990 991 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 992 // Create the oat file. 993 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 994 oat_location, error_msgs)); 995 } 996 997 // Failed, bail. 998 if (open_oat_file.get() == nullptr) { 999 std::string error_msg; 1000 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1001 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1002 error_msgs->push_back(error_msg); 1003 return false; 1004 } 1005 1006 // Try to load again, but stronger checks. 1007 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 1008 dex_files); 1009 if (success) { 1010 RegisterOatFile(open_oat_file.release()); 1011 return true; 1012 } else { 1013 return false; 1014 } 1015} 1016 1017const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1018 uint32_t dex_location_checksum, 1019 const char* oat_location, 1020 std::string* error_msg) { 1021 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1022 !Runtime::Current()->IsCompiler(), 1023 error_msg)); 1024 if (oat_file.get() == nullptr) { 1025 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1026 error_msg->c_str()); 1027 return nullptr; 1028 } 1029 Runtime* runtime = Runtime::Current(); 1030 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1031 if (image_space != nullptr) { 1032 const ImageHeader& image_header = image_space->GetImageHeader(); 1033 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1034 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1035 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1036 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1037 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1038 actual_image_oat_checksum); 1039 return nullptr; 1040 } 1041 1042 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1043 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1044 if (expected_image_oat_offset != actual_image_oat_offset) { 1045 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1046 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1047 actual_image_oat_offset); 1048 return nullptr; 1049 } 1050 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1051 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1052 if (expected_patch_delta != actual_patch_delta) { 1053 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1054 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1055 return nullptr; 1056 } 1057 } 1058 1059 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1060 &dex_location_checksum); 1061 if (oat_dex_file == nullptr) { 1062 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1063 dex_location); 1064 return nullptr; 1065 } 1066 uint32_t expected_dex_checksum = dex_location_checksum; 1067 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1068 if (expected_dex_checksum != actual_dex_checksum) { 1069 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1070 "found 0x%x", oat_location, expected_dex_checksum, 1071 actual_dex_checksum); 1072 return nullptr; 1073 } 1074 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1075 if (dex_file.get() != nullptr) { 1076 return oat_file.release(); 1077 } else { 1078 return nullptr; 1079 } 1080} 1081 1082const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1083 int fd, const char* oat_location, 1084 std::vector<std::string>* error_msgs) { 1085 // Generate the output oat file for the dex file 1086 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1087 std::string error_msg; 1088 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1089 CHECK(!error_msg.empty()); 1090 error_msgs->push_back(error_msg); 1091 return nullptr; 1092 } 1093 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1094 !Runtime::Current()->IsCompiler(), 1095 &error_msg)); 1096 if (oat_file.get() == nullptr) { 1097 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1098 oat_location, error_msg.c_str()); 1099 error_msgs->push_back(compound_msg); 1100 return nullptr; 1101 } 1102 1103 return oat_file.release(); 1104} 1105 1106bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1107 const InstructionSet instruction_set) { 1108 Runtime* runtime = Runtime::Current(); 1109 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1110 if (image_space == nullptr) { 1111 return false; 1112 } 1113 uint32_t image_oat_checksum = 0; 1114 if (instruction_set == kRuntimeISA) { 1115 const ImageHeader& image_header = image_space->GetImageHeader(); 1116 image_oat_checksum = image_header.GetOatChecksum(); 1117 } else { 1118 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1119 image_space->GetImageLocation().c_str(), instruction_set)); 1120 image_oat_checksum = image_header->GetOatChecksum(); 1121 } 1122 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1123} 1124 1125bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1126 const InstructionSet instruction_set, 1127 std::string* error_msg) { 1128 Runtime* runtime = Runtime::Current(); 1129 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1130 if (image_space == nullptr) { 1131 *error_msg = "No image space for verification against"; 1132 return false; 1133 } 1134 1135 // If the requested instruction set is the same as the current runtime, 1136 // we can use the checksums directly. If it isn't, we'll have to read the 1137 // image header from the image for the right instruction set. 1138 uint32_t image_oat_checksum = 0; 1139 uintptr_t image_oat_data_begin = 0; 1140 int32_t image_patch_delta = 0; 1141 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1142 const ImageHeader& image_header = image_space->GetImageHeader(); 1143 image_oat_checksum = image_header.GetOatChecksum(); 1144 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1145 image_patch_delta = image_header.GetPatchDelta(); 1146 } else { 1147 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1148 image_space->GetImageLocation().c_str(), instruction_set)); 1149 image_oat_checksum = image_header->GetOatChecksum(); 1150 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1151 image_patch_delta = image_header->GetPatchDelta(); 1152 } 1153 const OatHeader& oat_header = oat_file->GetOatHeader(); 1154 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1155 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1156 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1157 if (!ret) { 1158 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1159 oat_file->GetLocation().c_str(), 1160 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1161 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1162 oat_file->GetOatHeader().GetImagePatchDelta(), 1163 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1164 } 1165 return ret; 1166} 1167 1168bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1169 const char* dex_location, 1170 uint32_t dex_location_checksum, 1171 const InstructionSet instruction_set, 1172 std::string* error_msg) { 1173 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1174 return false; 1175 } 1176 1177 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1178 &dex_location_checksum); 1179 if (oat_dex_file == NULL) { 1180 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1181 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1182 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1183 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1184 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1185 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1186 oat_file->GetLocation().c_str(), 1187 oat_dex_file->GetDexFileLocation().c_str()); 1188 } 1189 return false; 1190 } 1191 1192 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1193 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1194 oat_file->GetLocation().c_str(), 1195 oat_dex_file->GetDexFileLocationChecksum(), 1196 dex_location, dex_location_checksum); 1197 return false; 1198 } 1199 return true; 1200} 1201 1202bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1203 const char* dex_location, 1204 std::string* error_msg) { 1205 CHECK(oat_file != nullptr); 1206 CHECK(dex_location != nullptr); 1207 std::unique_ptr<const DexFile> dex_file; 1208 uint32_t dex_location_checksum; 1209 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1210 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1211 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1212 // directory. 1213 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1214 if (oat_dex_file == nullptr) { 1215 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1216 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1217 error_msg->c_str()); 1218 return false; 1219 } 1220 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1221 } else { 1222 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1223 kRuntimeISA, error_msg); 1224 if (!verified) { 1225 return false; 1226 } 1227 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1228 &dex_location_checksum)->OpenDexFile(error_msg)); 1229 } 1230 return dex_file.get() != nullptr; 1231} 1232 1233const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1234 const char* dex_location, 1235 const uint32_t* const dex_location_checksum, 1236 InstructionSet isa, 1237 std::vector<std::string>* error_msgs, 1238 bool* obsolete_file_cleanup_failed) { 1239 *obsolete_file_cleanup_failed = false; 1240 bool already_opened = false; 1241 std::string dex_location_str(dex_location); 1242 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1243 &already_opened, 1244 obsolete_file_cleanup_failed, 1245 error_msgs)); 1246 std::string error_msg; 1247 if (oat_file.get() == nullptr) { 1248 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1249 dex_location)); 1250 return nullptr; 1251 } else if (oat_file->IsExecutable() && 1252 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1253 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1254 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1255 error_msg.c_str())); 1256 return nullptr; 1257 } else if (!oat_file->IsExecutable() && 1258 Runtime::Current()->GetHeap()->HasImageSpace() && 1259 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1260 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1261 "dex location '%s'. Image checksum incorrect.", 1262 oat_file->GetLocation().c_str(), dex_location)); 1263 return nullptr; 1264 } else { 1265 return oat_file.release(); 1266 } 1267} 1268 1269const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1270 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1271 for (size_t i = 0; i < oat_files_.size(); i++) { 1272 const OatFile* oat_file = oat_files_[i]; 1273 DCHECK(oat_file != nullptr); 1274 if (oat_file->GetLocation() == oat_location) { 1275 return oat_file; 1276 } 1277 } 1278 return nullptr; 1279} 1280 1281const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1282 InstructionSet isa, 1283 bool *already_opened, 1284 bool *obsolete_file_cleanup_failed, 1285 std::vector<std::string>* error_msgs) { 1286 // Find out if we've already opened the file 1287 const OatFile* ret = nullptr; 1288 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1289 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1290 if (ret != nullptr) { 1291 *already_opened = true; 1292 return ret; 1293 } 1294 1295 std::string dalvik_cache; 1296 bool have_android_data = false; 1297 bool have_dalvik_cache = false; 1298 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1299 &have_android_data, &have_dalvik_cache); 1300 std::string cache_filename; 1301 if (have_dalvik_cache) { 1302 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1303 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1304 if (ret != nullptr) { 1305 *already_opened = true; 1306 return ret; 1307 } 1308 } else { 1309 // If we need to relocate we should just place odex back where it started. 1310 cache_filename = odex_filename; 1311 } 1312 1313 ret = nullptr; 1314 1315 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1316 // 1317 // Now we do the following: 1318 // 1) Try and open the odex version 1319 // 2) If present, checksum-verified & relocated correctly return it 1320 // 3) Close the odex version to free up its address space. 1321 // 4) Try and open the cache version 1322 // 5) If present, checksum-verified & relocated correctly return it 1323 // 6) Close the cache version to free up its address space. 1324 // 7) If we should relocate: 1325 // a) If we have opened and checksum-verified the odex version relocate it to 1326 // 'cache_filename' and return it 1327 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1328 // it. This should not happen often (I think only the run-test's will hit this case). 1329 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1330 // this point. 1331 // 9) Return nullptr 1332 1333 *already_opened = false; 1334 const Runtime* runtime = Runtime::Current(); 1335 CHECK(runtime != nullptr); 1336 bool executable = !runtime->IsCompiler(); 1337 1338 std::string odex_error_msg; 1339 bool should_patch_system = false; 1340 bool odex_checksum_verified = false; 1341 bool have_system_odex = false; 1342 { 1343 // There is a high probability that these both these oat files map similar/the same address 1344 // spaces so we must scope them like this so they each gets its turn. 1345 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1346 executable, &odex_error_msg)); 1347 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1348 &odex_checksum_verified, 1349 &odex_error_msg)) { 1350 error_msgs->push_back(odex_error_msg); 1351 return odex_oat_file.release(); 1352 } else { 1353 if (odex_checksum_verified) { 1354 // We can just relocate 1355 should_patch_system = true; 1356 odex_error_msg = "Image Patches are incorrect"; 1357 } 1358 if (odex_oat_file.get() != nullptr) { 1359 have_system_odex = true; 1360 } 1361 } 1362 } 1363 1364 std::string cache_error_msg; 1365 bool should_patch_cache = false; 1366 bool cache_checksum_verified = false; 1367 if (have_dalvik_cache) { 1368 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1369 executable, &cache_error_msg)); 1370 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1371 &cache_checksum_verified, 1372 &cache_error_msg)) { 1373 error_msgs->push_back(cache_error_msg); 1374 return cache_oat_file.release(); 1375 } else if (cache_checksum_verified) { 1376 // We can just relocate 1377 should_patch_cache = true; 1378 cache_error_msg = "Image Patches are incorrect"; 1379 } 1380 } else if (have_android_data) { 1381 // dalvik_cache does not exist but android data does. This means we should be able to create 1382 // it, so we should try. 1383 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1384 } 1385 1386 ret = nullptr; 1387 std::string error_msg; 1388 if (runtime->CanRelocate()) { 1389 // Run relocation 1390 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1391 if (space != nullptr) { 1392 const std::string& image_location = space->GetImageLocation(); 1393 if (odex_checksum_verified && should_patch_system) { 1394 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1395 } else if (cache_checksum_verified && should_patch_cache) { 1396 CHECK(have_dalvik_cache); 1397 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1398 } 1399 } else if (have_system_odex) { 1400 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1401 } 1402 } 1403 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1404 // implicitly: were able to fine where the cached version is but we were unable to use it, 1405 // either as a destination for relocation or to open a file. We should delete it if it is 1406 // there. 1407 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1408 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1409 "searching for dex file %s: %s", 1410 cache_filename.c_str(), dex_location.c_str(), 1411 strerror(errno)); 1412 error_msgs->push_back(rm_error_msg); 1413 VLOG(class_linker) << rm_error_msg; 1414 // Let the caller know that we couldn't remove the obsolete file. 1415 // This is a good indication that further writes may fail as well. 1416 *obsolete_file_cleanup_failed = true; 1417 } 1418 } 1419 if (ret == nullptr) { 1420 VLOG(class_linker) << error_msg; 1421 error_msgs->push_back(error_msg); 1422 std::string relocation_msg; 1423 if (runtime->CanRelocate()) { 1424 relocation_msg = StringPrintf(" and relocation failed"); 1425 } 1426 if (have_dalvik_cache && cache_checksum_verified) { 1427 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1428 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1429 cache_filename.c_str(), cache_error_msg.c_str(), 1430 relocation_msg.c_str()); 1431 } else { 1432 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1433 "dalvik_cache availible)%s.", odex_filename.c_str(), 1434 odex_error_msg.c_str(), relocation_msg.c_str()); 1435 } 1436 VLOG(class_linker) << error_msg; 1437 error_msgs->push_back(error_msg); 1438 } 1439 return ret; 1440} 1441 1442const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1443 InstructionSet isa, 1444 std::string* error_msg) { 1445 // We open it non-executable 1446 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1447 if (output.get() == nullptr) { 1448 return nullptr; 1449 } 1450 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1451 VerifyOatImageChecksum(output.get(), isa)) { 1452 return output.release(); 1453 } else { 1454 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1455 oat_path.c_str()); 1456 return nullptr; 1457 } 1458} 1459 1460const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1461 const std::string& output_oat, 1462 const std::string& image_location, 1463 InstructionSet isa, 1464 std::string* error_msg) { 1465 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1466 // We don't have an image space so there is no point in trying to patchoat. 1467 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1468 << "running without an image. Attempting to use oat file for interpretation."; 1469 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1470 } 1471 if (!Runtime::Current()->IsDex2OatEnabled()) { 1472 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1473 // input_oat but make sure we only do interpretation on it's dex files. 1474 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1475 << "disabled. Attempting to use oat file for interpretation"; 1476 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1477 } 1478 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1479 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1480 1481 std::string isa_arg("--instruction-set="); 1482 isa_arg += GetInstructionSetString(isa); 1483 std::string input_oat_filename_arg("--input-oat-file="); 1484 input_oat_filename_arg += input_oat; 1485 std::string output_oat_filename_arg("--output-oat-file="); 1486 output_oat_filename_arg += output_oat; 1487 std::string patched_image_arg("--patched-image-location="); 1488 patched_image_arg += image_location; 1489 1490 std::vector<std::string> argv; 1491 argv.push_back(patchoat); 1492 argv.push_back(isa_arg); 1493 argv.push_back(input_oat_filename_arg); 1494 argv.push_back(output_oat_filename_arg); 1495 argv.push_back(patched_image_arg); 1496 1497 std::string command_line(Join(argv, ' ')); 1498 LOG(INFO) << "Relocate Oat File: " << command_line; 1499 bool success = Exec(argv, error_msg); 1500 if (success) { 1501 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1502 !Runtime::Current()->IsCompiler(), error_msg)); 1503 bool checksum_verified = false; 1504 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1505 return output.release(); 1506 } else if (output.get() != nullptr) { 1507 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1508 "but output file '%s' failed verifcation: %s", 1509 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1510 } else { 1511 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1512 "but was unable to open output file '%s': %s", 1513 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1514 } 1515 } else if (!Runtime::Current()->IsCompiler()) { 1516 // patchoat failed which means we probably don't have enough room to place the output oat file, 1517 // instead of failing we should just run the interpreter from the dex files in the input oat. 1518 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1519 << "for interpretation. patchoat failure was: " << *error_msg; 1520 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1521 } else { 1522 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1523 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1524 error_msg->c_str()); 1525 } 1526 return nullptr; 1527} 1528 1529int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1530 Runtime* runtime = Runtime::Current(); 1531 int32_t real_patch_delta; 1532 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1533 CHECK(image_space != nullptr); 1534 if (isa == Runtime::Current()->GetInstructionSet()) { 1535 const ImageHeader& image_header = image_space->GetImageHeader(); 1536 real_patch_delta = image_header.GetPatchDelta(); 1537 } else { 1538 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1539 image_space->GetImageLocation().c_str(), isa)); 1540 real_patch_delta = image_header->GetPatchDelta(); 1541 } 1542 const OatHeader& oat_header = oat_file->GetOatHeader(); 1543 return real_patch_delta - oat_header.GetImagePatchDelta(); 1544} 1545 1546bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1547 bool* checksum_verified, 1548 std::string* error_msg) { 1549 std::string compound_msg("Oat file failed to verify: "); 1550 Runtime* runtime = Runtime::Current(); 1551 uint32_t real_image_checksum; 1552 void* real_image_oat_offset; 1553 int32_t real_patch_delta; 1554 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1555 if (image_space == nullptr) { 1556 *error_msg = "No image space present"; 1557 return false; 1558 } 1559 if (isa == Runtime::Current()->GetInstructionSet()) { 1560 const ImageHeader& image_header = image_space->GetImageHeader(); 1561 real_image_checksum = image_header.GetOatChecksum(); 1562 real_image_oat_offset = image_header.GetOatDataBegin(); 1563 real_patch_delta = image_header.GetPatchDelta(); 1564 } else { 1565 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1566 image_space->GetImageLocation().c_str(), isa)); 1567 real_image_checksum = image_header->GetOatChecksum(); 1568 real_image_oat_offset = image_header->GetOatDataBegin(); 1569 real_patch_delta = image_header->GetPatchDelta(); 1570 } 1571 1572 const OatHeader& oat_header = oat_file->GetOatHeader(); 1573 1574 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1575 *checksum_verified = oat_image_checksum == real_image_checksum; 1576 if (!*checksum_verified) { 1577 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1578 real_image_checksum, oat_image_checksum); 1579 } 1580 1581 void* oat_image_oat_offset = 1582 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1583 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1584 if (!offset_verified) { 1585 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1586 real_image_oat_offset, oat_image_oat_offset); 1587 } 1588 1589 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1590 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1591 if (!patch_delta_verified) { 1592 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1593 real_patch_delta, oat_patch_delta); 1594 } 1595 1596 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1597 if (ret) { 1598 *error_msg = compound_msg; 1599 } 1600 return ret; 1601} 1602 1603const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1604 std::string* error_msg) { 1605 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1606 if (oat_file != nullptr) { 1607 return oat_file; 1608 } 1609 1610 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1611 error_msg); 1612 if (oat_file == NULL) { 1613 return NULL; 1614 } 1615 return oat_file; 1616} 1617 1618static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1619 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1620 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1621 1622 DCHECK(obj != NULL); 1623 DCHECK(class_linker != NULL); 1624 1625 if (obj->IsArtMethod()) { 1626 mirror::ArtMethod* method = obj->AsArtMethod(); 1627 if (!method->IsNative()) { 1628 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1629 if (method != Runtime::Current()->GetResolutionMethod()) { 1630 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1631 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1632 } 1633 } 1634 } 1635} 1636 1637void ClassLinker::InitFromImage() { 1638 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1639 CHECK(!init_done_); 1640 1641 Thread* self = Thread::Current(); 1642 gc::Heap* heap = Runtime::Current()->GetHeap(); 1643 gc::space::ImageSpace* space = heap->GetImageSpace(); 1644 dex_cache_image_class_lookup_required_ = true; 1645 CHECK(space != NULL); 1646 OatFile& oat_file = GetImageOatFile(space); 1647 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1648 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1649 const char* image_file_location = oat_file.GetOatHeader(). 1650 GetStoreValueByKey(OatHeader::kImageLocationKey); 1651 CHECK(image_file_location == nullptr || *image_file_location == 0); 1652 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1653 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1654 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1655 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1656 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1657 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1658 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1659 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1660 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1661 1662 StackHandleScope<1> hs(self); 1663 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1664 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1665 AsObjectArray<mirror::Class>())); 1666 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1667 1668 // Special case of setting up the String class early so that we can test arbitrary objects 1669 // as being Strings or not 1670 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1671 1672 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1673 static_cast<uint32_t>(dex_caches->GetLength())); 1674 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1675 StackHandleScope<1> hs(self); 1676 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1677 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1678 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1679 nullptr); 1680 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1681 std::string error_msg; 1682 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1683 if (dex_file == NULL) { 1684 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1685 << " from within oat file " << oat_file.GetLocation() 1686 << " error '" << error_msg << "'"; 1687 } 1688 1689 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1690 1691 AppendToBootClassPath(*dex_file, dex_cache); 1692 } 1693 1694 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1695 // bitmap walk. 1696 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1697 1698 // Set entry point to interpreter if in InterpretOnly mode. 1699 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1700 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1701 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1702 } 1703 1704 // reinit class_roots_ 1705 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1706 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1707 1708 // reinit array_iftable_ from any array class instance, they should be == 1709 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1710 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1711 // String class root was set above 1712 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1713 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1714 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1715 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1716 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1717 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1718 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1719 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1720 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1721 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1722 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1723 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1724 1725 FinishInit(self); 1726 1727 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1728} 1729 1730void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1731 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1732 if ((flags & kVisitRootFlagAllRoots) != 0) { 1733 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1734 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1735 } 1736 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1737 for (auto& pair : new_class_roots_) { 1738 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1739 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1740 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1741 if (UNLIKELY(new_ref != old_ref)) { 1742 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1743 // corresponding object. This is slow, but luckily for us, this may only happen with a 1744 // concurrent moving GC. 1745 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1746 it != end && it->first == pair.first; ++it) { 1747 // If the class stored matches the old class, update it to the new value. 1748 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1749 it->second = GcRoot<mirror::Class>(new_ref); 1750 } 1751 } 1752 } 1753 } 1754 } 1755 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1756 new_class_roots_.clear(); 1757 } 1758 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1759 log_new_class_table_roots_ = true; 1760 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1761 log_new_class_table_roots_ = false; 1762 } 1763 // We deliberately ignore the class roots in the image since we 1764 // handle image roots by using the MS/CMS rescanning of dirty cards. 1765} 1766 1767// Keep in sync with InitCallback. Anything we visit, we need to 1768// reinit references to when reinitializing a ClassLinker from a 1769// mapped image. 1770void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1771 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1772 Thread* self = Thread::Current(); 1773 { 1774 ReaderMutexLock mu(self, dex_lock_); 1775 if ((flags & kVisitRootFlagAllRoots) != 0) { 1776 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1777 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1778 } 1779 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1780 for (size_t index : new_dex_cache_roots_) { 1781 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1782 } 1783 } 1784 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1785 new_dex_cache_roots_.clear(); 1786 } 1787 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1788 log_new_dex_caches_roots_ = true; 1789 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1790 log_new_dex_caches_roots_ = false; 1791 } 1792 } 1793 VisitClassRoots(callback, arg, flags); 1794 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1795 DCHECK(!array_iftable_.IsNull()); 1796 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1797 if (!find_array_class_cache_[i].IsNull()) { 1798 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1799 } 1800 } 1801} 1802 1803void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1804 if (dex_cache_image_class_lookup_required_) { 1805 MoveImageClassesToClassTable(); 1806 } 1807 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1808 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1809 mirror::Class* c = it.second.Read(); 1810 if (!visitor(c, arg)) { 1811 return; 1812 } 1813 } 1814} 1815 1816static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1817 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1818 classes->insert(c); 1819 return true; 1820} 1821 1822void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1823 std::set<mirror::Class*> classes; 1824 VisitClasses(GetClassesVisitor, &classes); 1825 for (mirror::Class* klass : classes) { 1826 if (!visitor(klass, arg)) { 1827 return; 1828 } 1829 } 1830} 1831 1832ClassLinker::~ClassLinker() { 1833 mirror::Class::ResetClass(); 1834 mirror::String::ResetClass(); 1835 mirror::Reference::ResetClass(); 1836 mirror::ArtField::ResetClass(); 1837 mirror::ArtMethod::ResetClass(); 1838 mirror::BooleanArray::ResetArrayClass(); 1839 mirror::ByteArray::ResetArrayClass(); 1840 mirror::CharArray::ResetArrayClass(); 1841 mirror::DoubleArray::ResetArrayClass(); 1842 mirror::FloatArray::ResetArrayClass(); 1843 mirror::IntArray::ResetArrayClass(); 1844 mirror::LongArray::ResetArrayClass(); 1845 mirror::ShortArray::ResetArrayClass(); 1846 mirror::Throwable::ResetClass(); 1847 mirror::StackTraceElement::ResetClass(); 1848 STLDeleteElements(&boot_class_path_); 1849 STLDeleteElements(&oat_files_); 1850} 1851 1852mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1853 gc::Heap* heap = Runtime::Current()->GetHeap(); 1854 StackHandleScope<16> hs(self); 1855 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1856 Handle<mirror::DexCache> dex_cache( 1857 hs.NewHandle(down_cast<mirror::DexCache*>( 1858 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1859 VoidFunctor())))); 1860 if (dex_cache.Get() == NULL) { 1861 return NULL; 1862 } 1863 Handle<mirror::String> 1864 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1865 if (location.Get() == NULL) { 1866 return NULL; 1867 } 1868 Handle<mirror::ObjectArray<mirror::String>> 1869 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1870 if (strings.Get() == NULL) { 1871 return NULL; 1872 } 1873 Handle<mirror::ObjectArray<mirror::Class>> 1874 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1875 if (types.Get() == NULL) { 1876 return NULL; 1877 } 1878 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1879 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1880 if (methods.Get() == NULL) { 1881 return NULL; 1882 } 1883 Handle<mirror::ObjectArray<mirror::ArtField>> 1884 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1885 if (fields.Get() == NULL) { 1886 return NULL; 1887 } 1888 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1889 fields.Get()); 1890 return dex_cache.Get(); 1891} 1892 1893mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1894 uint32_t class_size) { 1895 DCHECK_GE(class_size, sizeof(mirror::Class)); 1896 gc::Heap* heap = Runtime::Current()->GetHeap(); 1897 mirror::Class::InitializeClassVisitor visitor(class_size); 1898 mirror::Object* k = kMovingClasses ? 1899 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1900 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1901 if (UNLIKELY(k == nullptr)) { 1902 CHECK(self->IsExceptionPending()); // OOME. 1903 return nullptr; 1904 } 1905 return k->AsClass(); 1906} 1907 1908mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1909 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1910} 1911 1912mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1913 return down_cast<mirror::ArtField*>( 1914 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1915} 1916 1917mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1918 return down_cast<mirror::ArtMethod*>( 1919 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1920} 1921 1922mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1923 Thread* self, size_t length) { 1924 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1925 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1926} 1927 1928mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1929 mirror::Class* klass) { 1930 DCHECK(klass != NULL); 1931 1932 // For temporary classes we must wait for them to be retired. 1933 if (init_done_ && klass->IsTemp()) { 1934 CHECK(!klass->IsResolved()); 1935 if (klass->IsErroneous()) { 1936 ThrowEarlierClassFailure(klass); 1937 return nullptr; 1938 } 1939 StackHandleScope<1> hs(self); 1940 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1941 ObjectLock<mirror::Class> lock(self, h_class); 1942 // Loop and wait for the resolving thread to retire this class. 1943 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1944 lock.WaitIgnoringInterrupts(); 1945 } 1946 if (h_class->IsErroneous()) { 1947 ThrowEarlierClassFailure(h_class.Get()); 1948 return nullptr; 1949 } 1950 CHECK(h_class->IsRetired()); 1951 // Get the updated class from class table. 1952 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1953 } 1954 1955 // Wait for the class if it has not already been linked. 1956 if (!klass->IsResolved() && !klass->IsErroneous()) { 1957 StackHandleScope<1> hs(self); 1958 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1959 ObjectLock<mirror::Class> lock(self, h_class); 1960 // Check for circular dependencies between classes. 1961 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1962 ThrowClassCircularityError(h_class.Get()); 1963 h_class->SetStatus(mirror::Class::kStatusError, self); 1964 return nullptr; 1965 } 1966 // Wait for the pending initialization to complete. 1967 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1968 lock.WaitIgnoringInterrupts(); 1969 } 1970 } 1971 1972 if (klass->IsErroneous()) { 1973 ThrowEarlierClassFailure(klass); 1974 return nullptr; 1975 } 1976 // Return the loaded class. No exceptions should be pending. 1977 CHECK(klass->IsResolved()) << PrettyClass(klass); 1978 self->AssertNoPendingException(); 1979 return klass; 1980} 1981 1982mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1983 ConstHandle<mirror::ClassLoader> class_loader) { 1984 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1985 DCHECK(self != nullptr); 1986 self->AssertNoPendingException(); 1987 if (descriptor[1] == '\0') { 1988 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1989 // for primitive classes that aren't backed by dex files. 1990 return FindPrimitiveClass(descriptor[0]); 1991 } 1992 // Find the class in the loaded classes table. 1993 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1994 if (klass != NULL) { 1995 return EnsureResolved(self, descriptor, klass); 1996 } 1997 // Class is not yet loaded. 1998 if (descriptor[0] == '[') { 1999 return CreateArrayClass(self, descriptor, class_loader); 2000 } else if (class_loader.Get() == nullptr) { 2001 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 2002 if (pair.second != NULL) { 2003 StackHandleScope<1> hs(self); 2004 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2005 } 2006 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2007 // First try the boot class path, we check the descriptor first to avoid an unnecessary 2008 // throw of a NoClassDefFoundError. 2009 if (IsInBootClassPath(descriptor)) { 2010 mirror::Class* system_class = FindSystemClass(self, descriptor); 2011 CHECK(system_class != NULL); 2012 return system_class; 2013 } 2014 // Next try the compile time class path. 2015 const std::vector<const DexFile*>* class_path; 2016 { 2017 ScopedObjectAccessUnchecked soa(self); 2018 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2019 soa.AddLocalReference<jobject>(class_loader.Get())); 2020 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2021 } 2022 2023 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 2024 if (pair.second != NULL) { 2025 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2026 } 2027 2028 } else { 2029 ScopedObjectAccessUnchecked soa(self); 2030 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2031 soa.AddLocalReference<jobject>(class_loader.Get())); 2032 std::string class_name_string(DescriptorToDot(descriptor)); 2033 ScopedLocalRef<jobject> result(soa.Env(), NULL); 2034 { 2035 ScopedThreadStateChange tsc(self, kNative); 2036 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2037 soa.Env()->NewStringUTF(class_name_string.c_str())); 2038 if (class_name_object.get() == NULL) { 2039 return NULL; 2040 } 2041 CHECK(class_loader_object.get() != NULL); 2042 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2043 WellKnownClasses::java_lang_ClassLoader_loadClass, 2044 class_name_object.get())); 2045 } 2046 if (self->IsExceptionPending()) { 2047 // If the ClassLoader threw, pass that exception up. 2048 return NULL; 2049 } else if (result.get() == NULL) { 2050 // broken loader - throw NPE to be compatible with Dalvik 2051 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 2052 class_name_string.c_str()).c_str()); 2053 return NULL; 2054 } else { 2055 // success, return mirror::Class* 2056 return soa.Decode<mirror::Class*>(result.get()); 2057 } 2058 } 2059 2060 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2061 return NULL; 2062} 2063 2064mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2065 ConstHandle<mirror::ClassLoader> class_loader, 2066 const DexFile& dex_file, 2067 const DexFile::ClassDef& dex_class_def) { 2068 Thread* self = Thread::Current(); 2069 StackHandleScope<3> hs(self); 2070 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2071 bool should_allocate = false; 2072 2073 // Load the class from the dex file. 2074 if (UNLIKELY(!init_done_)) { 2075 // finish up init of hand crafted class_roots_ 2076 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2077 klass.Assign(GetClassRoot(kJavaLangObject)); 2078 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2079 klass.Assign(GetClassRoot(kJavaLangClass)); 2080 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2081 klass.Assign(GetClassRoot(kJavaLangString)); 2082 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2083 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2084 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2085 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2086 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2087 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2088 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2089 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2090 } else { 2091 should_allocate = true; 2092 } 2093 } else { 2094 should_allocate = true; 2095 } 2096 2097 if (should_allocate) { 2098 // Allocate a class with the status of not ready. 2099 // Interface object should get the right size here. Regular class will 2100 // figure out the right size later and be replaced with one of the right 2101 // size when the class becomes resolved. 2102 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2103 } 2104 if (UNLIKELY(klass.Get() == nullptr)) { 2105 CHECK(self->IsExceptionPending()); // Expect an OOME. 2106 return nullptr; 2107 } 2108 klass->SetDexCache(FindDexCache(dex_file)); 2109 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2110 ObjectLock<mirror::Class> lock(self, klass); 2111 if (self->IsExceptionPending()) { 2112 // An exception occured during load, set status to erroneous while holding klass' lock in case 2113 // notification is necessary. 2114 if (!klass->IsErroneous()) { 2115 klass->SetStatus(mirror::Class::kStatusError, self); 2116 } 2117 return nullptr; 2118 } 2119 klass->SetClinitThreadId(self->GetTid()); 2120 2121 // Add the newly loaded class to the loaded classes table. 2122 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2123 if (existing != nullptr) { 2124 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2125 // this thread to block. 2126 return EnsureResolved(self, descriptor, existing); 2127 } 2128 2129 // Finish loading (if necessary) by finding parents 2130 CHECK(!klass->IsLoaded()); 2131 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2132 // Loading failed. 2133 if (!klass->IsErroneous()) { 2134 klass->SetStatus(mirror::Class::kStatusError, self); 2135 } 2136 return nullptr; 2137 } 2138 CHECK(klass->IsLoaded()); 2139 // Link the class (if necessary) 2140 CHECK(!klass->IsResolved()); 2141 // TODO: Use fast jobjects? 2142 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2143 2144 mirror::Class* new_class = nullptr; 2145 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2146 // Linking failed. 2147 if (!klass->IsErroneous()) { 2148 klass->SetStatus(mirror::Class::kStatusError, self); 2149 } 2150 return nullptr; 2151 } 2152 self->AssertNoPendingException(); 2153 CHECK(new_class != nullptr) << descriptor; 2154 CHECK(new_class->IsResolved()) << descriptor; 2155 2156 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2157 2158 /* 2159 * We send CLASS_PREPARE events to the debugger from here. The 2160 * definition of "preparation" is creating the static fields for a 2161 * class and initializing them to the standard default values, but not 2162 * executing any code (that comes later, during "initialization"). 2163 * 2164 * We did the static preparation in LinkClass. 2165 * 2166 * The class has been prepared and resolved but possibly not yet verified 2167 * at this point. 2168 */ 2169 Dbg::PostClassPrepare(new_class_h.Get()); 2170 2171 return new_class_h.Get(); 2172} 2173 2174uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2175 const DexFile::ClassDef& dex_class_def) { 2176 const byte* class_data = dex_file.GetClassData(dex_class_def); 2177 size_t num_ref = 0; 2178 size_t num_8 = 0; 2179 size_t num_16 = 0; 2180 size_t num_32 = 0; 2181 size_t num_64 = 0; 2182 if (class_data != NULL) { 2183 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2184 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2185 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2186 char c = descriptor[0]; 2187 switch (c) { 2188 case 'L': 2189 case '[': 2190 num_ref++; 2191 break; 2192 case 'J': 2193 case 'D': 2194 num_64++; 2195 break; 2196 case 'I': 2197 case 'F': 2198 num_32++; 2199 break; 2200 case 'S': 2201 case 'C': 2202 num_16++; 2203 break; 2204 case 'B': 2205 case 'Z': 2206 num_8++; 2207 break; 2208 default: 2209 LOG(FATAL) << "Unknown descriptor: " << c; 2210 } 2211 } 2212 } 2213 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2214} 2215 2216OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2217 bool* found) { 2218 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2219 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2220 if (oat_file == nullptr) { 2221 *found = false; 2222 return OatFile::OatClass::Invalid(); 2223 } 2224 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2225 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2226 &dex_location_checksum); 2227 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2228 *found = true; 2229 return oat_dex_file->GetOatClass(class_def_idx); 2230} 2231 2232static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2233 uint32_t method_idx) { 2234 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2235 const byte* class_data = dex_file.GetClassData(class_def); 2236 CHECK(class_data != NULL); 2237 ClassDataItemIterator it(dex_file, class_data); 2238 // Skip fields 2239 while (it.HasNextStaticField()) { 2240 it.Next(); 2241 } 2242 while (it.HasNextInstanceField()) { 2243 it.Next(); 2244 } 2245 // Process methods 2246 size_t class_def_method_index = 0; 2247 while (it.HasNextDirectMethod()) { 2248 if (it.GetMemberIndex() == method_idx) { 2249 return class_def_method_index; 2250 } 2251 class_def_method_index++; 2252 it.Next(); 2253 } 2254 while (it.HasNextVirtualMethod()) { 2255 if (it.GetMemberIndex() == method_idx) { 2256 return class_def_method_index; 2257 } 2258 class_def_method_index++; 2259 it.Next(); 2260 } 2261 DCHECK(!it.HasNext()); 2262 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2263 return 0; 2264} 2265 2266const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2267 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2268 // method for direct methods (or virtual methods made direct). 2269 mirror::Class* declaring_class = method->GetDeclaringClass(); 2270 size_t oat_method_index; 2271 if (method->IsStatic() || method->IsDirect()) { 2272 // Simple case where the oat method index was stashed at load time. 2273 oat_method_index = method->GetMethodIndex(); 2274 } else { 2275 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2276 // by search for its position in the declared virtual methods. 2277 oat_method_index = declaring_class->NumDirectMethods(); 2278 size_t end = declaring_class->NumVirtualMethods(); 2279 bool found = false; 2280 for (size_t i = 0; i < end; i++) { 2281 if (declaring_class->GetVirtualMethod(i) == method) { 2282 found = true; 2283 break; 2284 } 2285 oat_method_index++; 2286 } 2287 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2288 } 2289 DCHECK_EQ(oat_method_index, 2290 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2291 method->GetDeclaringClass()->GetDexClassDefIndex(), 2292 method->GetDexMethodIndex())); 2293 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2294 declaring_class->GetDexClassDefIndex(), 2295 found); 2296 if (!found) { 2297 return OatFile::OatMethod::Invalid(); 2298 } 2299 *found = true; 2300 return oat_class.GetOatMethod(oat_method_index); 2301} 2302 2303// Special case to get oat code without overwriting a trampoline. 2304const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2305 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2306 if (method->IsProxyMethod()) { 2307 return GetQuickProxyInvokeHandler(); 2308 } 2309 bool found; 2310 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2311 const void* result = nullptr; 2312 if (found) { 2313 result = oat_method.GetQuickCode(); 2314 } 2315 2316 if (result == nullptr) { 2317 if (method->IsNative()) { 2318 // No code and native? Use generic trampoline. 2319 result = GetQuickGenericJniTrampoline(); 2320 } else if (method->IsPortableCompiled()) { 2321 // No code? Do we expect portable code? 2322 result = GetQuickToPortableBridge(); 2323 } else { 2324 // No code? You must mean to go into the interpreter. 2325 result = GetQuickToInterpreterBridge(); 2326 } 2327 } 2328 return result; 2329} 2330 2331const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2332 bool* have_portable_code) { 2333 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2334 *have_portable_code = false; 2335 if (method->IsProxyMethod()) { 2336 return GetPortableProxyInvokeHandler(); 2337 } 2338 bool found; 2339 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2340 const void* result = nullptr; 2341 const void* quick_code = nullptr; 2342 if (found) { 2343 result = oat_method.GetPortableCode(); 2344 quick_code = oat_method.GetQuickCode(); 2345 } 2346 2347 if (result == nullptr) { 2348 if (quick_code == nullptr) { 2349 // No code? You must mean to go into the interpreter. 2350 result = GetPortableToInterpreterBridge(); 2351 } else { 2352 // No code? But there's quick code, so use a bridge. 2353 result = GetPortableToQuickBridge(); 2354 } 2355 } else { 2356 *have_portable_code = true; 2357 } 2358 return result; 2359} 2360 2361const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2362 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2363 return nullptr; 2364 } 2365 bool found; 2366 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2367 return found ? oat_method.GetQuickCode() : nullptr; 2368} 2369 2370const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2371 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2372 return nullptr; 2373 } 2374 bool found; 2375 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2376 return found ? oat_method.GetPortableCode() : nullptr; 2377} 2378 2379const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2380 uint32_t method_idx) { 2381 bool found; 2382 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2383 if (!found) { 2384 return nullptr; 2385 } 2386 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2387 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2388} 2389 2390const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2391 uint32_t method_idx) { 2392 bool found; 2393 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2394 if (!found) { 2395 return nullptr; 2396 } 2397 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2398 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2399} 2400 2401// Returns true if the method must run with interpreter, false otherwise. 2402static bool NeedsInterpreter( 2403 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2404 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2405 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2406 // No code: need interpreter. 2407 // May return true for native code, in the case of generic JNI 2408 // DCHECK(!method->IsNative()); 2409 return true; 2410 } 2411#ifdef ART_SEA_IR_MODE 2412 ScopedObjectAccess soa(Thread::Current()); 2413 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2414 LOG(INFO) << "Found " << PrettyMethod(method); 2415 return false; 2416 } 2417#endif 2418 // If interpreter mode is enabled, every method (except native and proxy) must 2419 // be run with interpreter. 2420 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2421 !method->IsNative() && !method->IsProxyMethod(); 2422} 2423 2424void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2425 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2426 if (klass->NumDirectMethods() == 0) { 2427 return; // No direct methods => no static methods. 2428 } 2429 Runtime* runtime = Runtime::Current(); 2430 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2431 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2432 return; // OAT file unavailable. 2433 } 2434 } 2435 2436 const DexFile& dex_file = klass->GetDexFile(); 2437 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2438 CHECK(dex_class_def != nullptr); 2439 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2440 // There should always be class data if there were direct methods. 2441 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2442 ClassDataItemIterator it(dex_file, class_data); 2443 // Skip fields 2444 while (it.HasNextStaticField()) { 2445 it.Next(); 2446 } 2447 while (it.HasNextInstanceField()) { 2448 it.Next(); 2449 } 2450 bool has_oat_class; 2451 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2452 &has_oat_class); 2453 // Link the code of methods skipped by LinkCode. 2454 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2455 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2456 if (!method->IsStatic()) { 2457 // Only update static methods. 2458 continue; 2459 } 2460 const void* portable_code = nullptr; 2461 const void* quick_code = nullptr; 2462 if (has_oat_class) { 2463 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2464 portable_code = oat_method.GetPortableCode(); 2465 quick_code = oat_method.GetQuickCode(); 2466 } 2467 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2468 bool have_portable_code = false; 2469 if (enter_interpreter) { 2470 // Use interpreter entry point. 2471 // Check whether the method is native, in which case it's generic JNI. 2472 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2473 quick_code = GetQuickGenericJniTrampoline(); 2474 portable_code = GetPortableToQuickBridge(); 2475 } else { 2476 portable_code = GetPortableToInterpreterBridge(); 2477 quick_code = GetQuickToInterpreterBridge(); 2478 } 2479 } else { 2480 if (portable_code == nullptr) { 2481 portable_code = GetPortableToQuickBridge(); 2482 } else { 2483 have_portable_code = true; 2484 } 2485 if (quick_code == nullptr) { 2486 quick_code = GetQuickToPortableBridge(); 2487 } 2488 } 2489 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2490 have_portable_code); 2491 } 2492 // Ignore virtual methods on the iterator. 2493} 2494 2495void ClassLinker::LinkCode(ConstHandle<mirror::ArtMethod> method, 2496 const OatFile::OatClass* oat_class, 2497 const DexFile& dex_file, uint32_t dex_method_index, 2498 uint32_t method_index) { 2499 if (Runtime::Current()->IsCompiler()) { 2500 // The following code only applies to a non-compiler runtime. 2501 return; 2502 } 2503 // Method shouldn't have already been linked. 2504 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2505 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2506 if (oat_class != nullptr) { 2507 // Every kind of method should at least get an invoke stub from the oat_method. 2508 // non-abstract methods also get their code pointers. 2509 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2510 oat_method.LinkMethod(method.Get()); 2511 } 2512 2513 // Install entry point from interpreter. 2514 bool enter_interpreter = NeedsInterpreter(method.Get(), 2515 method->GetEntryPointFromQuickCompiledCode(), 2516 method->GetEntryPointFromPortableCompiledCode()); 2517 if (enter_interpreter && !method->IsNative()) { 2518 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2519 } else { 2520 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2521 } 2522 2523 if (method->IsAbstract()) { 2524 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2525 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2526 return; 2527 } 2528 2529 bool have_portable_code = false; 2530 if (method->IsStatic() && !method->IsConstructor()) { 2531 // For static methods excluding the class initializer, install the trampoline. 2532 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2533 // after initializing class (see ClassLinker::InitializeClass method). 2534 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2535 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2536 } else if (enter_interpreter) { 2537 if (!method->IsNative()) { 2538 // Set entry point from compiled code if there's no code or in interpreter only mode. 2539 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2540 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2541 } else { 2542 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2543 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2544 } 2545 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2546 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2547 have_portable_code = true; 2548 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2549 } else { 2550 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2551 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2552 } 2553 2554 if (method->IsNative()) { 2555 // Unregistering restores the dlsym lookup stub. 2556 method->UnregisterNative(Thread::Current()); 2557 2558 if (enter_interpreter) { 2559 // We have a native method here without code. Then it should have either the GenericJni 2560 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2561 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2562 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2563 } 2564 } 2565 2566 // Allow instrumentation its chance to hijack code. 2567 Runtime* runtime = Runtime::Current(); 2568 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2569 method->GetEntryPointFromQuickCompiledCode(), 2570 method->GetEntryPointFromPortableCompiledCode(), 2571 have_portable_code); 2572} 2573 2574 2575 2576void ClassLinker::LoadClass(const DexFile& dex_file, 2577 const DexFile::ClassDef& dex_class_def, 2578 ConstHandle<mirror::Class> klass, 2579 mirror::ClassLoader* class_loader) { 2580 CHECK(klass.Get() != NULL); 2581 CHECK(klass->GetDexCache() != NULL); 2582 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2583 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2584 CHECK(descriptor != NULL); 2585 2586 klass->SetClass(GetClassRoot(kJavaLangClass)); 2587 if (kUseBakerOrBrooksReadBarrier) { 2588 klass->AssertReadBarrierPointer(); 2589 } 2590 uint32_t access_flags = dex_class_def.access_flags_; 2591 // Make sure that none of our runtime-only flags are set. 2592 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2593 klass->SetAccessFlags(access_flags); 2594 klass->SetClassLoader(class_loader); 2595 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2596 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2597 2598 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2599 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2600 2601 const byte* class_data = dex_file.GetClassData(dex_class_def); 2602 if (class_data == NULL) { 2603 return; // no fields or methods - for example a marker interface 2604 } 2605 2606 2607 bool has_oat_class = false; 2608 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2609 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2610 &has_oat_class); 2611 if (has_oat_class) { 2612 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2613 } 2614 } 2615 if (!has_oat_class) { 2616 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2617 } 2618} 2619 2620void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2621 const byte* class_data, 2622 ConstHandle<mirror::Class> klass, 2623 mirror::ClassLoader* class_loader, 2624 const OatFile::OatClass* oat_class) { 2625 // Load fields. 2626 ClassDataItemIterator it(dex_file, class_data); 2627 Thread* self = Thread::Current(); 2628 if (it.NumStaticFields() != 0) { 2629 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2630 if (UNLIKELY(statics == NULL)) { 2631 CHECK(self->IsExceptionPending()); // OOME. 2632 return; 2633 } 2634 klass->SetSFields(statics); 2635 } 2636 if (it.NumInstanceFields() != 0) { 2637 mirror::ObjectArray<mirror::ArtField>* fields = 2638 AllocArtFieldArray(self, it.NumInstanceFields()); 2639 if (UNLIKELY(fields == NULL)) { 2640 CHECK(self->IsExceptionPending()); // OOME. 2641 return; 2642 } 2643 klass->SetIFields(fields); 2644 } 2645 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2646 StackHandleScope<1> hs(self); 2647 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2648 if (UNLIKELY(sfield.Get() == NULL)) { 2649 CHECK(self->IsExceptionPending()); // OOME. 2650 return; 2651 } 2652 klass->SetStaticField(i, sfield.Get()); 2653 LoadField(dex_file, it, klass, sfield); 2654 } 2655 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2656 StackHandleScope<1> hs(self); 2657 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2658 if (UNLIKELY(ifield.Get() == NULL)) { 2659 CHECK(self->IsExceptionPending()); // OOME. 2660 return; 2661 } 2662 klass->SetInstanceField(i, ifield.Get()); 2663 LoadField(dex_file, it, klass, ifield); 2664 } 2665 2666 // Load methods. 2667 if (it.NumDirectMethods() != 0) { 2668 // TODO: append direct methods to class object 2669 mirror::ObjectArray<mirror::ArtMethod>* directs = 2670 AllocArtMethodArray(self, it.NumDirectMethods()); 2671 if (UNLIKELY(directs == NULL)) { 2672 CHECK(self->IsExceptionPending()); // OOME. 2673 return; 2674 } 2675 klass->SetDirectMethods(directs); 2676 } 2677 if (it.NumVirtualMethods() != 0) { 2678 // TODO: append direct methods to class object 2679 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2680 AllocArtMethodArray(self, it.NumVirtualMethods()); 2681 if (UNLIKELY(virtuals == NULL)) { 2682 CHECK(self->IsExceptionPending()); // OOME. 2683 return; 2684 } 2685 klass->SetVirtualMethods(virtuals); 2686 } 2687 size_t class_def_method_index = 0; 2688 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2689 StackHandleScope<1> hs(self); 2690 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2691 if (UNLIKELY(method.Get() == NULL)) { 2692 CHECK(self->IsExceptionPending()); // OOME. 2693 return; 2694 } 2695 klass->SetDirectMethod(i, method.Get()); 2696 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2697 method->SetMethodIndex(class_def_method_index); 2698 class_def_method_index++; 2699 } 2700 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2701 StackHandleScope<1> hs(self); 2702 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2703 if (UNLIKELY(method.Get() == NULL)) { 2704 CHECK(self->IsExceptionPending()); // OOME. 2705 return; 2706 } 2707 klass->SetVirtualMethod(i, method.Get()); 2708 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2709 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2710 class_def_method_index++; 2711 } 2712 DCHECK(!it.HasNext()); 2713} 2714 2715void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2716 ConstHandle<mirror::Class> klass, 2717 ConstHandle<mirror::ArtField> dst) { 2718 uint32_t field_idx = it.GetMemberIndex(); 2719 dst->SetDexFieldIndex(field_idx); 2720 dst->SetDeclaringClass(klass.Get()); 2721 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2722} 2723 2724mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2725 const ClassDataItemIterator& it, 2726 ConstHandle<mirror::Class> klass) { 2727 uint32_t dex_method_idx = it.GetMemberIndex(); 2728 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2729 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2730 2731 mirror::ArtMethod* dst = AllocArtMethod(self); 2732 if (UNLIKELY(dst == NULL)) { 2733 CHECK(self->IsExceptionPending()); // OOME. 2734 return NULL; 2735 } 2736 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2737 2738 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2739 dst->SetDexMethodIndex(dex_method_idx); 2740 dst->SetDeclaringClass(klass.Get()); 2741 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2742 2743 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2744 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2745 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2746 2747 uint32_t access_flags = it.GetMemberAccessFlags(); 2748 2749 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2750 // Set finalizable flag on declaring class. 2751 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2752 // Void return type. 2753 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2754 klass->SetFinalizable(); 2755 } else { 2756 std::string temp; 2757 const char* klass_descriptor = klass->GetDescriptor(&temp); 2758 // The Enum class declares a "final" finalize() method to prevent subclasses from 2759 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2760 // subclasses, so we exclude it here. 2761 // We also want to avoid setting the flag on Object, where we know that finalize() is 2762 // empty. 2763 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2764 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2765 klass->SetFinalizable(); 2766 } 2767 } 2768 } 2769 } else if (method_name[0] == '<') { 2770 // Fix broken access flags for initializers. Bug 11157540. 2771 bool is_init = (strcmp("<init>", method_name) == 0); 2772 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2773 if (UNLIKELY(!is_init && !is_clinit)) { 2774 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2775 } else { 2776 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2777 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2778 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2779 access_flags |= kAccConstructor; 2780 } 2781 } 2782 } 2783 dst->SetAccessFlags(access_flags); 2784 2785 self->EndAssertNoThreadSuspension(old_cause); 2786 return dst; 2787} 2788 2789void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2790 Thread* self = Thread::Current(); 2791 StackHandleScope<1> hs(self); 2792 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2793 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2794 AppendToBootClassPath(dex_file, dex_cache); 2795} 2796 2797void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2798 ConstHandle<mirror::DexCache> dex_cache) { 2799 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2800 boot_class_path_.push_back(&dex_file); 2801 RegisterDexFile(dex_file, dex_cache); 2802} 2803 2804bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2805 dex_lock_.AssertSharedHeld(Thread::Current()); 2806 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2807 mirror::DexCache* dex_cache = GetDexCache(i); 2808 if (dex_cache->GetDexFile() == &dex_file) { 2809 return true; 2810 } 2811 } 2812 return false; 2813} 2814 2815bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2816 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2817 return IsDexFileRegisteredLocked(dex_file); 2818} 2819 2820void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2821 ConstHandle<mirror::DexCache> dex_cache) { 2822 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2823 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2824 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2825 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2826 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2827 dex_cache->SetDexFile(&dex_file); 2828 if (log_new_dex_caches_roots_) { 2829 // TODO: This is not safe if we can remove dex caches. 2830 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2831 } 2832} 2833 2834void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2835 Thread* self = Thread::Current(); 2836 { 2837 ReaderMutexLock mu(self, dex_lock_); 2838 if (IsDexFileRegisteredLocked(dex_file)) { 2839 return; 2840 } 2841 } 2842 // Don't alloc while holding the lock, since allocation may need to 2843 // suspend all threads and another thread may need the dex_lock_ to 2844 // get to a suspend point. 2845 StackHandleScope<1> hs(self); 2846 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2847 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2848 { 2849 WriterMutexLock mu(self, dex_lock_); 2850 if (IsDexFileRegisteredLocked(dex_file)) { 2851 return; 2852 } 2853 RegisterDexFileLocked(dex_file, dex_cache); 2854 } 2855} 2856 2857void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2858 ConstHandle<mirror::DexCache> dex_cache) { 2859 WriterMutexLock mu(Thread::Current(), dex_lock_); 2860 RegisterDexFileLocked(dex_file, dex_cache); 2861} 2862 2863mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2864 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2865 // Search assuming unique-ness of dex file. 2866 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2867 mirror::DexCache* dex_cache = GetDexCache(i); 2868 if (dex_cache->GetDexFile() == &dex_file) { 2869 return dex_cache; 2870 } 2871 } 2872 // Search matching by location name. 2873 std::string location(dex_file.GetLocation()); 2874 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2875 mirror::DexCache* dex_cache = GetDexCache(i); 2876 if (dex_cache->GetDexFile()->GetLocation() == location) { 2877 return dex_cache; 2878 } 2879 } 2880 // Failure, dump diagnostic and abort. 2881 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2882 mirror::DexCache* dex_cache = GetDexCache(i); 2883 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2884 } 2885 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2886 return NULL; 2887} 2888 2889void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2890 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2891 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2892 mirror::DexCache* dex_cache = GetDexCache(i); 2893 dex_cache->Fixup(resolution_method); 2894 } 2895} 2896 2897mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2898 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2899 if (UNLIKELY(klass == NULL)) { 2900 return NULL; 2901 } 2902 return InitializePrimitiveClass(klass, type); 2903} 2904 2905mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2906 Primitive::Type type) { 2907 CHECK(primitive_class != NULL); 2908 // Must hold lock on object when initializing. 2909 Thread* self = Thread::Current(); 2910 StackHandleScope<1> hs(self); 2911 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2912 ObjectLock<mirror::Class> lock(self, h_class); 2913 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2914 primitive_class->SetPrimitiveType(type); 2915 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2916 const char* descriptor = Primitive::Descriptor(type); 2917 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2918 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2919 return primitive_class; 2920} 2921 2922// Create an array class (i.e. the class object for the array, not the 2923// array itself). "descriptor" looks like "[C" or "[[[[B" or 2924// "[Ljava/lang/String;". 2925// 2926// If "descriptor" refers to an array of primitives, look up the 2927// primitive type's internally-generated class object. 2928// 2929// "class_loader" is the class loader of the class that's referring to 2930// us. It's used to ensure that we're looking for the element type in 2931// the right context. It does NOT become the class loader for the 2932// array class; that always comes from the base element class. 2933// 2934// Returns NULL with an exception raised on failure. 2935mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2936 ConstHandle<mirror::ClassLoader> class_loader) { 2937 // Identify the underlying component type 2938 CHECK_EQ('[', descriptor[0]); 2939 StackHandleScope<2> hs(self); 2940 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2941 if (component_type.Get() == nullptr) { 2942 DCHECK(self->IsExceptionPending()); 2943 // We need to accept erroneous classes as component types. 2944 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2945 if (component_type.Get() == nullptr) { 2946 DCHECK(self->IsExceptionPending()); 2947 return nullptr; 2948 } else { 2949 self->ClearException(); 2950 } 2951 } 2952 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2953 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2954 return nullptr; 2955 } 2956 // See if the component type is already loaded. Array classes are 2957 // always associated with the class loader of their underlying 2958 // element type -- an array of Strings goes with the loader for 2959 // java/lang/String -- so we need to look for it there. (The 2960 // caller should have checked for the existence of the class 2961 // before calling here, but they did so with *their* class loader, 2962 // not the component type's loader.) 2963 // 2964 // If we find it, the caller adds "loader" to the class' initiating 2965 // loader list, which should prevent us from going through this again. 2966 // 2967 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2968 // are the same, because our caller (FindClass) just did the 2969 // lookup. (Even if we get this wrong we still have correct behavior, 2970 // because we effectively do this lookup again when we add the new 2971 // class to the hash table --- necessary because of possible races with 2972 // other threads.) 2973 if (class_loader.Get() != component_type->GetClassLoader()) { 2974 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2975 if (new_class != NULL) { 2976 return new_class; 2977 } 2978 } 2979 2980 // Fill out the fields in the Class. 2981 // 2982 // It is possible to execute some methods against arrays, because 2983 // all arrays are subclasses of java_lang_Object_, so we need to set 2984 // up a vtable. We can just point at the one in java_lang_Object_. 2985 // 2986 // Array classes are simple enough that we don't need to do a full 2987 // link step. 2988 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2989 if (UNLIKELY(!init_done_)) { 2990 // Classes that were hand created, ie not by FindSystemClass 2991 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2992 new_class.Assign(GetClassRoot(kClassArrayClass)); 2993 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2994 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2995 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2996 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2997 } else if (strcmp(descriptor, 2998 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2999 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3000 } else if (strcmp(descriptor, 3001 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3002 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3003 } else if (strcmp(descriptor, "[C") == 0) { 3004 new_class.Assign(GetClassRoot(kCharArrayClass)); 3005 } else if (strcmp(descriptor, "[I") == 0) { 3006 new_class.Assign(GetClassRoot(kIntArrayClass)); 3007 } 3008 } 3009 if (new_class.Get() == nullptr) { 3010 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3011 if (new_class.Get() == nullptr) { 3012 return nullptr; 3013 } 3014 new_class->SetComponentType(component_type.Get()); 3015 } 3016 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3017 DCHECK(new_class->GetComponentType() != NULL); 3018 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3019 new_class->SetSuperClass(java_lang_Object); 3020 new_class->SetVTable(java_lang_Object->GetVTable()); 3021 new_class->SetPrimitiveType(Primitive::kPrimNot); 3022 new_class->SetClassLoader(component_type->GetClassLoader()); 3023 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3024 new_class->PopulateEmbeddedImtAndVTable(); 3025 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3026 // don't need to set new_class->SetObjectSize(..) 3027 // because Object::SizeOf delegates to Array::SizeOf 3028 3029 3030 // All arrays have java/lang/Cloneable and java/io/Serializable as 3031 // interfaces. We need to set that up here, so that stuff like 3032 // "instanceof" works right. 3033 // 3034 // Note: The GC could run during the call to FindSystemClass, 3035 // so we need to make sure the class object is GC-valid while we're in 3036 // there. Do this by clearing the interface list so the GC will just 3037 // think that the entries are null. 3038 3039 3040 // Use the single, global copies of "interfaces" and "iftable" 3041 // (remember not to free them for arrays). 3042 { 3043 mirror::IfTable* array_iftable = array_iftable_.Read(); 3044 CHECK(array_iftable != nullptr); 3045 new_class->SetIfTable(array_iftable); 3046 } 3047 3048 // Inherit access flags from the component type. 3049 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3050 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3051 access_flags &= kAccJavaFlagsMask; 3052 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3053 // and remove "interface". 3054 access_flags |= kAccAbstract | kAccFinal; 3055 access_flags &= ~kAccInterface; 3056 3057 new_class->SetAccessFlags(access_flags); 3058 3059 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3060 if (existing == nullptr) { 3061 return new_class.Get(); 3062 } 3063 // Another thread must have loaded the class after we 3064 // started but before we finished. Abandon what we've 3065 // done. 3066 // 3067 // (Yes, this happens.) 3068 3069 return existing; 3070} 3071 3072mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3073 switch (type) { 3074 case 'B': 3075 return GetClassRoot(kPrimitiveByte); 3076 case 'C': 3077 return GetClassRoot(kPrimitiveChar); 3078 case 'D': 3079 return GetClassRoot(kPrimitiveDouble); 3080 case 'F': 3081 return GetClassRoot(kPrimitiveFloat); 3082 case 'I': 3083 return GetClassRoot(kPrimitiveInt); 3084 case 'J': 3085 return GetClassRoot(kPrimitiveLong); 3086 case 'S': 3087 return GetClassRoot(kPrimitiveShort); 3088 case 'Z': 3089 return GetClassRoot(kPrimitiveBoolean); 3090 case 'V': 3091 return GetClassRoot(kPrimitiveVoid); 3092 default: 3093 break; 3094 } 3095 std::string printable_type(PrintableChar(type)); 3096 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3097 return NULL; 3098} 3099 3100mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3101 size_t hash) { 3102 if (VLOG_IS_ON(class_linker)) { 3103 mirror::DexCache* dex_cache = klass->GetDexCache(); 3104 std::string source; 3105 if (dex_cache != NULL) { 3106 source += " from "; 3107 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3108 } 3109 LOG(INFO) << "Loaded class " << descriptor << source; 3110 } 3111 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3112 mirror::Class* existing = 3113 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3114 if (existing != NULL) { 3115 return existing; 3116 } 3117 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3118 dex_cache_image_class_lookup_required_) { 3119 // Check a class loaded with the system class loader matches one in the image if the class 3120 // is in the image. 3121 existing = LookupClassFromImage(descriptor); 3122 if (existing != NULL) { 3123 CHECK(klass == existing); 3124 } 3125 } 3126 VerifyObject(klass); 3127 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3128 if (log_new_class_table_roots_) { 3129 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3130 } 3131 return NULL; 3132} 3133 3134mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3135 size_t hash) { 3136 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3137 mirror::Class* existing = 3138 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3139 3140 if (existing == nullptr) { 3141 CHECK(klass->IsProxyClass()); 3142 return nullptr; 3143 } 3144 3145 CHECK_NE(existing, klass) << descriptor; 3146 CHECK(!existing->IsResolved()) << descriptor; 3147 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3148 3149 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3150 ++it) { 3151 mirror::Class* klass = it->second.Read(); 3152 if (klass == existing) { 3153 class_table_.erase(it); 3154 break; 3155 } 3156 } 3157 3158 CHECK(!klass->IsTemp()) << descriptor; 3159 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3160 dex_cache_image_class_lookup_required_) { 3161 // Check a class loaded with the system class loader matches one in the image if the class 3162 // is in the image. 3163 existing = LookupClassFromImage(descriptor); 3164 if (existing != nullptr) { 3165 CHECK(klass == existing) << descriptor; 3166 } 3167 } 3168 VerifyObject(klass); 3169 3170 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3171 if (log_new_class_table_roots_) { 3172 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3173 } 3174 3175 return existing; 3176} 3177 3178bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3179 size_t hash = Hash(descriptor); 3180 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3181 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3182 it != end && it->first == hash; 3183 ++it) { 3184 mirror::Class* klass = it->second.Read(); 3185 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3186 class_table_.erase(it); 3187 return true; 3188 } 3189 } 3190 return false; 3191} 3192 3193mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3194 const mirror::ClassLoader* class_loader) { 3195 size_t hash = Hash(descriptor); 3196 { 3197 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3198 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3199 if (result != NULL) { 3200 return result; 3201 } 3202 } 3203 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3204 return NULL; 3205 } else { 3206 // Lookup failed but need to search dex_caches_. 3207 mirror::Class* result = LookupClassFromImage(descriptor); 3208 if (result != NULL) { 3209 InsertClass(descriptor, result, hash); 3210 } else { 3211 // Searching the image dex files/caches failed, we don't want to get into this situation 3212 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3213 // classes into the class table. 3214 const int32_t kMaxFailedDexCacheLookups = 1000; 3215 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3216 MoveImageClassesToClassTable(); 3217 } 3218 } 3219 return result; 3220 } 3221} 3222 3223mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3224 const mirror::ClassLoader* class_loader, 3225 size_t hash) { 3226 auto end = class_table_.end(); 3227 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3228 mirror::Class* klass = it->second.Read(); 3229 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3230 if (kIsDebugBuild) { 3231 // Check for duplicates in the table. 3232 for (++it; it != end && it->first == hash; ++it) { 3233 mirror::Class* klass2 = it->second.Read(); 3234 CHECK(!(klass2->GetClassLoader() == class_loader && 3235 klass2->DescriptorEquals(descriptor))) 3236 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3237 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3238 } 3239 } 3240 return klass; 3241 } 3242 } 3243 return NULL; 3244} 3245 3246static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3247 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3248 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3249 CHECK(image != NULL); 3250 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3251 return root->AsObjectArray<mirror::DexCache>(); 3252} 3253 3254void ClassLinker::MoveImageClassesToClassTable() { 3255 Thread* self = Thread::Current(); 3256 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3257 if (!dex_cache_image_class_lookup_required_) { 3258 return; // All dex cache classes are already in the class table. 3259 } 3260 const char* old_no_suspend_cause = 3261 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3262 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3263 std::string temp; 3264 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3265 mirror::DexCache* dex_cache = dex_caches->Get(i); 3266 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3267 for (int32_t j = 0; j < types->GetLength(); j++) { 3268 mirror::Class* klass = types->Get(j); 3269 if (klass != NULL) { 3270 DCHECK(klass->GetClassLoader() == NULL); 3271 const char* descriptor = klass->GetDescriptor(&temp); 3272 size_t hash = Hash(descriptor); 3273 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3274 if (existing != NULL) { 3275 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3276 << PrettyClassAndClassLoader(klass); 3277 } else { 3278 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3279 if (log_new_class_table_roots_) { 3280 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3281 } 3282 } 3283 } 3284 } 3285 } 3286 dex_cache_image_class_lookup_required_ = false; 3287 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3288} 3289 3290mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3291 Thread* self = Thread::Current(); 3292 const char* old_no_suspend_cause = 3293 self->StartAssertNoThreadSuspension("Image class lookup"); 3294 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3295 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3296 mirror::DexCache* dex_cache = dex_caches->Get(i); 3297 const DexFile* dex_file = dex_cache->GetDexFile(); 3298 // Try binary searching the string/type index. 3299 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3300 if (string_id != NULL) { 3301 const DexFile::TypeId* type_id = 3302 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3303 if (type_id != NULL) { 3304 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3305 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3306 if (klass != NULL) { 3307 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3308 return klass; 3309 } 3310 } 3311 } 3312 } 3313 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3314 return NULL; 3315} 3316 3317void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3318 result.clear(); 3319 if (dex_cache_image_class_lookup_required_) { 3320 MoveImageClassesToClassTable(); 3321 } 3322 size_t hash = Hash(descriptor); 3323 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3324 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3325 it != end && it->first == hash; ++it) { 3326 mirror::Class* klass = it->second.Read(); 3327 if (klass->DescriptorEquals(descriptor)) { 3328 result.push_back(klass); 3329 } 3330 } 3331} 3332 3333void ClassLinker::VerifyClass(ConstHandle<mirror::Class> klass) { 3334 // TODO: assert that the monitor on the Class is held 3335 Thread* self = Thread::Current(); 3336 ObjectLock<mirror::Class> lock(self, klass); 3337 3338 // Don't attempt to re-verify if already sufficiently verified. 3339 if (klass->IsVerified() || 3340 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3341 return; 3342 } 3343 3344 // The class might already be erroneous, for example at compile time if we attempted to verify 3345 // this class as a parent to another. 3346 if (klass->IsErroneous()) { 3347 ThrowEarlierClassFailure(klass.Get()); 3348 return; 3349 } 3350 3351 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3352 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3353 } else { 3354 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3355 << PrettyClass(klass.Get()); 3356 CHECK(!Runtime::Current()->IsCompiler()); 3357 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3358 } 3359 3360 // Skip verification if disabled. 3361 if (!Runtime::Current()->IsVerificationEnabled()) { 3362 klass->SetStatus(mirror::Class::kStatusVerified, self); 3363 return; 3364 } 3365 3366 // Verify super class. 3367 StackHandleScope<2> hs(self); 3368 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3369 if (super.Get() != NULL) { 3370 // Acquire lock to prevent races on verifying the super class. 3371 ObjectLock<mirror::Class> lock(self, super); 3372 3373 if (!super->IsVerified() && !super->IsErroneous()) { 3374 VerifyClass(super); 3375 } 3376 if (!super->IsCompileTimeVerified()) { 3377 std::string error_msg( 3378 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3379 PrettyDescriptor(klass.Get()).c_str(), 3380 PrettyDescriptor(super.Get()).c_str())); 3381 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3382 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3383 if (cause.Get() != nullptr) { 3384 self->ClearException(); 3385 } 3386 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3387 if (cause.Get() != nullptr) { 3388 self->GetException(nullptr)->SetCause(cause.Get()); 3389 } 3390 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3391 if (Runtime::Current()->IsCompiler()) { 3392 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3393 } 3394 klass->SetStatus(mirror::Class::kStatusError, self); 3395 return; 3396 } 3397 } 3398 3399 // Try to use verification information from the oat file, otherwise do runtime verification. 3400 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3401 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3402 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3403 if (oat_file_class_status == mirror::Class::kStatusError) { 3404 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3405 << PrettyDescriptor(klass.Get()) << " in " 3406 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3407 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3408 PrettyDescriptor(klass.Get()).c_str()); 3409 klass->SetStatus(mirror::Class::kStatusError, self); 3410 return; 3411 } 3412 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3413 std::string error_msg; 3414 if (!preverified) { 3415 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3416 Runtime::Current()->IsCompiler(), 3417 &error_msg); 3418 } 3419 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3420 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3421 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3422 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3423 << " because: " << error_msg; 3424 } 3425 self->AssertNoPendingException(); 3426 // Make sure all classes referenced by catch blocks are resolved. 3427 ResolveClassExceptionHandlerTypes(dex_file, klass); 3428 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3429 // Even though there were no verifier failures we need to respect whether the super-class 3430 // was verified or requiring runtime reverification. 3431 if (super.Get() == NULL || super->IsVerified()) { 3432 klass->SetStatus(mirror::Class::kStatusVerified, self); 3433 } else { 3434 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3435 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3436 // Pretend a soft failure occured so that we don't consider the class verified below. 3437 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3438 } 3439 } else { 3440 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3441 // Soft failures at compile time should be retried at runtime. Soft 3442 // failures at runtime will be handled by slow paths in the generated 3443 // code. Set status accordingly. 3444 if (Runtime::Current()->IsCompiler()) { 3445 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3446 } else { 3447 klass->SetStatus(mirror::Class::kStatusVerified, self); 3448 } 3449 } 3450 } else { 3451 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3452 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3453 << " because: " << error_msg; 3454 self->AssertNoPendingException(); 3455 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3456 klass->SetStatus(mirror::Class::kStatusError, self); 3457 } 3458 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3459 // Class is verified so we don't need to do any access check on its methods. 3460 // Let the interpreter know it by setting the kAccPreverified flag onto each 3461 // method. 3462 // Note: we're going here during compilation and at runtime. When we set the 3463 // kAccPreverified flag when compiling image classes, the flag is recorded 3464 // in the image and is set when loading the image. 3465 klass->SetPreverifiedFlagOnAllMethods(); 3466 } 3467} 3468 3469bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3470 mirror::Class::Status& oat_file_class_status) { 3471 // If we're compiling, we can only verify the class using the oat file if 3472 // we are not compiling the image or if the class we're verifying is not part of 3473 // the app. In other words, we will only check for preverification of bootclasspath 3474 // classes. 3475 if (Runtime::Current()->IsCompiler()) { 3476 // Are we compiling the bootclasspath? 3477 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3478 return false; 3479 } 3480 // We are compiling an app (not the image). 3481 3482 // Is this an app class? (I.e. not a bootclasspath class) 3483 if (klass->GetClassLoader() != NULL) { 3484 return false; 3485 } 3486 } 3487 3488 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3489 // Make this work with gtests, which do not set up the image properly. 3490 // TODO: we should clean up gtests to set up the image path properly. 3491 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3492 return false; 3493 } 3494 3495 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3496 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3497 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3498 &dex_location_checksum); 3499 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3500 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3501 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3502 if (oat_file_class_status == mirror::Class::kStatusVerified || 3503 oat_file_class_status == mirror::Class::kStatusInitialized) { 3504 return true; 3505 } 3506 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3507 // Compile time verification failed with a soft error. Compile time verification can fail 3508 // because we have incomplete type information. Consider the following: 3509 // class ... { 3510 // Foo x; 3511 // .... () { 3512 // if (...) { 3513 // v1 gets assigned a type of resolved class Foo 3514 // } else { 3515 // v1 gets assigned a type of unresolved class Bar 3516 // } 3517 // iput x = v1 3518 // } } 3519 // when we merge v1 following the if-the-else it results in Conflict 3520 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3521 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3522 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3523 // at compile time). 3524 return false; 3525 } 3526 if (oat_file_class_status == mirror::Class::kStatusError) { 3527 // Compile time verification failed with a hard error. This is caused by invalid instructions 3528 // in the class. These errors are unrecoverable. 3529 return false; 3530 } 3531 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3532 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3533 // not loading the class. 3534 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3535 // isn't a problem and this case shouldn't occur 3536 return false; 3537 } 3538 std::string temp; 3539 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3540 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3541 << klass->GetDescriptor(&temp); 3542 3543 return false; 3544} 3545 3546void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3547 ConstHandle<mirror::Class> klass) { 3548 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3549 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3550 } 3551 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3552 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3553 } 3554} 3555 3556void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3557 mirror::ArtMethod* method) { 3558 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3559 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3560 if (code_item == NULL) { 3561 return; // native or abstract method 3562 } 3563 if (code_item->tries_size_ == 0) { 3564 return; // nothing to process 3565 } 3566 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3567 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3568 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3569 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3570 CatchHandlerIterator iterator(handlers_ptr); 3571 for (; iterator.HasNext(); iterator.Next()) { 3572 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3573 // unresolved exception types will be ignored by exception delivery 3574 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3575 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3576 if (exception_type == NULL) { 3577 DCHECK(Thread::Current()->IsExceptionPending()); 3578 Thread::Current()->ClearException(); 3579 } 3580 } 3581 } 3582 handlers_ptr = iterator.EndDataPointer(); 3583 } 3584} 3585 3586static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3587static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3588 ConstHandle<mirror::ArtMethod> prototype); 3589 3590mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3591 jobjectArray interfaces, jobject loader, 3592 jobjectArray methods, jobjectArray throws) { 3593 Thread* self = soa.Self(); 3594 StackHandleScope<8> hs(self); 3595 Handle<mirror::Class> klass(hs.NewHandle( 3596 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3597 if (klass.Get() == NULL) { 3598 CHECK(self->IsExceptionPending()); // OOME. 3599 return NULL; 3600 } 3601 DCHECK(klass->GetClass() != NULL); 3602 klass->SetObjectSize(sizeof(mirror::Proxy)); 3603 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3604 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3605 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3606 klass->SetName(soa.Decode<mirror::String*>(name)); 3607 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3608 klass->SetDexCache(proxy_class->GetDexCache()); 3609 klass->SetStatus(mirror::Class::kStatusIdx, self); 3610 3611 // Instance fields are inherited, but we add a couple of static fields... 3612 { 3613 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3614 if (UNLIKELY(sfields == NULL)) { 3615 CHECK(self->IsExceptionPending()); // OOME. 3616 return NULL; 3617 } 3618 klass->SetSFields(sfields); 3619 } 3620 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3621 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3622 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3623 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3624 CHECK(self->IsExceptionPending()); // OOME. 3625 return nullptr; 3626 } 3627 klass->SetStaticField(0, interfaces_sfield.Get()); 3628 interfaces_sfield->SetDexFieldIndex(0); 3629 interfaces_sfield->SetDeclaringClass(klass.Get()); 3630 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3631 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3632 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3633 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3634 CHECK(self->IsExceptionPending()); // OOME. 3635 return nullptr; 3636 } 3637 klass->SetStaticField(1, throws_sfield.Get()); 3638 throws_sfield->SetDexFieldIndex(1); 3639 throws_sfield->SetDeclaringClass(klass.Get()); 3640 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3641 3642 // Proxies have 1 direct method, the constructor 3643 { 3644 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3645 if (UNLIKELY(directs == nullptr)) { 3646 CHECK(self->IsExceptionPending()); // OOME. 3647 return nullptr; 3648 } 3649 klass->SetDirectMethods(directs); 3650 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3651 if (UNLIKELY(constructor == nullptr)) { 3652 CHECK(self->IsExceptionPending()); // OOME. 3653 return nullptr; 3654 } 3655 klass->SetDirectMethod(0, constructor); 3656 } 3657 3658 // Create virtual method using specified prototypes. 3659 size_t num_virtual_methods = 3660 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3661 { 3662 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3663 num_virtual_methods); 3664 if (UNLIKELY(virtuals == NULL)) { 3665 CHECK(self->IsExceptionPending()); // OOME. 3666 return NULL; 3667 } 3668 klass->SetVirtualMethods(virtuals); 3669 } 3670 for (size_t i = 0; i < num_virtual_methods; ++i) { 3671 StackHandleScope<1> hs(self); 3672 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3673 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3674 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3675 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3676 if (UNLIKELY(clone == nullptr)) { 3677 CHECK(self->IsExceptionPending()); // OOME. 3678 return nullptr; 3679 } 3680 klass->SetVirtualMethod(i, clone); 3681 } 3682 3683 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3684 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3685 self->AssertNoPendingException(); 3686 3687 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3688 mirror::Class* new_class = nullptr; 3689 { 3690 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3691 // Link the fields and virtual methods, creating vtable and iftables 3692 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3693 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3694 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3695 klass->SetStatus(mirror::Class::kStatusError, self); 3696 return nullptr; 3697 } 3698 } 3699 3700 CHECK(klass->IsRetired()); 3701 CHECK_NE(klass.Get(), new_class); 3702 klass.Assign(new_class); 3703 3704 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3705 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3706 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3707 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3708 3709 { 3710 // Lock on klass is released. Lock new class object. 3711 ObjectLock<mirror::Class> initialization_lock(self, klass); 3712 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3713 } 3714 3715 // sanity checks 3716 if (kIsDebugBuild) { 3717 CHECK(klass->GetIFields() == nullptr); 3718 CheckProxyConstructor(klass->GetDirectMethod(0)); 3719 for (size_t i = 0; i < num_virtual_methods; ++i) { 3720 StackHandleScope<2> hs(self); 3721 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3722 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3723 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3724 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3725 CheckProxyMethod(virtual_method, prototype); 3726 } 3727 3728 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3729 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3730 decoded_name->ToModifiedUtf8().c_str())); 3731 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3732 3733 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3734 decoded_name->ToModifiedUtf8().c_str())); 3735 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3736 3737 CHECK_EQ(klass.Get()->GetInterfaces(), 3738 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3739 CHECK_EQ(klass.Get()->GetThrows(), 3740 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3741 } 3742 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3743 CHECK(existing == nullptr); 3744 return klass.Get(); 3745} 3746 3747std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3748 DCHECK(proxy_class->IsProxyClass()); 3749 mirror::String* name = proxy_class->GetName(); 3750 DCHECK(name != NULL); 3751 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3752} 3753 3754mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3755 mirror::ArtMethod* proxy_method) { 3756 DCHECK(proxy_class->IsProxyClass()); 3757 DCHECK(proxy_method->IsProxyMethod()); 3758 // Locate the dex cache of the original interface/Object 3759 mirror::DexCache* dex_cache = nullptr; 3760 { 3761 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3762 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3763 mirror::DexCache* a_dex_cache = GetDexCache(i); 3764 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3765 dex_cache = a_dex_cache; 3766 break; 3767 } 3768 } 3769 } 3770 CHECK(dex_cache != nullptr); 3771 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3772 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3773 CHECK(resolved_method != nullptr); 3774 return resolved_method; 3775} 3776 3777 3778mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3779 ConstHandle<mirror::Class> klass, 3780 mirror::Class* proxy_class) { 3781 // Create constructor for Proxy that must initialize h 3782 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3783 proxy_class->GetDirectMethods(); 3784 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3785 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3786 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3787 // constructor method. 3788 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3789 proxy_constructor); 3790 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3791 // code_ too) 3792 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3793 if (constructor == nullptr) { 3794 CHECK(self->IsExceptionPending()); // OOME. 3795 return nullptr; 3796 } 3797 // Make this constructor public and fix the class to be our Proxy version 3798 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3799 constructor->SetDeclaringClass(klass.Get()); 3800 return constructor; 3801} 3802 3803static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3804 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3805 CHECK(constructor->IsConstructor()); 3806 CHECK_STREQ(constructor->GetName(), "<init>"); 3807 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3808 "(Ljava/lang/reflect/InvocationHandler;)V"); 3809 DCHECK(constructor->IsPublic()); 3810} 3811 3812mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3813 ConstHandle<mirror::Class> klass, 3814 ConstHandle<mirror::ArtMethod> prototype) { 3815 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3816 // prototype method 3817 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3818 prototype.Get()); 3819 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3820 // as necessary 3821 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3822 if (UNLIKELY(method == NULL)) { 3823 CHECK(self->IsExceptionPending()); // OOME. 3824 return NULL; 3825 } 3826 3827 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3828 // the intersection of throw exceptions as defined in Proxy 3829 method->SetDeclaringClass(klass.Get()); 3830 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3831 3832 // At runtime the method looks like a reference and argument saving method, clone the code 3833 // related parameters from this method. 3834 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3835 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3836 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3837 3838 return method; 3839} 3840 3841static void CheckProxyMethod(ConstHandle<mirror::ArtMethod> method, 3842 ConstHandle<mirror::ArtMethod> prototype) 3843 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3844 // Basic sanity 3845 CHECK(!prototype->IsFinal()); 3846 CHECK(method->IsFinal()); 3847 CHECK(!method->IsAbstract()); 3848 3849 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3850 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3851 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3852 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3853 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3854 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3855 3856 StackHandleScope<2> hs(Thread::Current()); 3857 MethodHelper mh(hs.NewHandle(method.Get())); 3858 MethodHelper mh2(hs.NewHandle(prototype.Get())); 3859 CHECK_STREQ(method->GetName(), prototype->GetName()); 3860 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3861 // More complex sanity - via dex cache 3862 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3863} 3864 3865static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3866 bool can_init_parents) 3867 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3868 if (can_init_statics && can_init_parents) { 3869 return true; 3870 } 3871 if (!can_init_statics) { 3872 // Check if there's a class initializer. 3873 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3874 if (clinit != NULL) { 3875 return false; 3876 } 3877 // Check if there are encoded static values needing initialization. 3878 if (klass->NumStaticFields() != 0) { 3879 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3880 DCHECK(dex_class_def != NULL); 3881 if (dex_class_def->static_values_off_ != 0) { 3882 return false; 3883 } 3884 } 3885 } 3886 if (!klass->IsInterface() && klass->HasSuperClass()) { 3887 mirror::Class* super_class = klass->GetSuperClass(); 3888 if (!can_init_parents && !super_class->IsInitialized()) { 3889 return false; 3890 } else { 3891 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3892 return false; 3893 } 3894 } 3895 } 3896 return true; 3897} 3898 3899bool ClassLinker::IsInitialized() const { 3900 return init_done_; 3901} 3902 3903bool ClassLinker::InitializeClass(ConstHandle<mirror::Class> klass, bool can_init_statics, 3904 bool can_init_parents) { 3905 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3906 3907 // Are we already initialized and therefore done? 3908 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3909 // an initialized class will never change its state. 3910 if (klass->IsInitialized()) { 3911 return true; 3912 } 3913 3914 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3915 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3916 return false; 3917 } 3918 3919 Thread* self = Thread::Current(); 3920 uint64_t t0; 3921 { 3922 ObjectLock<mirror::Class> lock(self, klass); 3923 3924 // Re-check under the lock in case another thread initialized ahead of us. 3925 if (klass->IsInitialized()) { 3926 return true; 3927 } 3928 3929 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3930 if (klass->IsErroneous()) { 3931 ThrowEarlierClassFailure(klass.Get()); 3932 return false; 3933 } 3934 3935 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3936 3937 if (!klass->IsVerified()) { 3938 VerifyClass(klass); 3939 if (!klass->IsVerified()) { 3940 // We failed to verify, expect either the klass to be erroneous or verification failed at 3941 // compile time. 3942 if (klass->IsErroneous()) { 3943 CHECK(self->IsExceptionPending()); 3944 } else { 3945 CHECK(Runtime::Current()->IsCompiler()); 3946 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3947 } 3948 return false; 3949 } else { 3950 self->AssertNoPendingException(); 3951 } 3952 } 3953 3954 // If the class is kStatusInitializing, either this thread is 3955 // initializing higher up the stack or another thread has beat us 3956 // to initializing and we need to wait. Either way, this 3957 // invocation of InitializeClass will not be responsible for 3958 // running <clinit> and will return. 3959 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3960 // Could have got an exception during verification. 3961 if (self->IsExceptionPending()) { 3962 return false; 3963 } 3964 // We caught somebody else in the act; was it us? 3965 if (klass->GetClinitThreadId() == self->GetTid()) { 3966 // Yes. That's fine. Return so we can continue initializing. 3967 return true; 3968 } 3969 // No. That's fine. Wait for another thread to finish initializing. 3970 return WaitForInitializeClass(klass, self, lock); 3971 } 3972 3973 if (!ValidateSuperClassDescriptors(klass)) { 3974 klass->SetStatus(mirror::Class::kStatusError, self); 3975 return false; 3976 } 3977 3978 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3979 3980 // From here out other threads may observe that we're initializing and so changes of state 3981 // require the a notification. 3982 klass->SetClinitThreadId(self->GetTid()); 3983 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3984 3985 t0 = NanoTime(); 3986 } 3987 3988 // Initialize super classes, must be done while initializing for the JLS. 3989 if (!klass->IsInterface() && klass->HasSuperClass()) { 3990 mirror::Class* super_class = klass->GetSuperClass(); 3991 if (!super_class->IsInitialized()) { 3992 CHECK(!super_class->IsInterface()); 3993 CHECK(can_init_parents); 3994 StackHandleScope<1> hs(self); 3995 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3996 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3997 if (!super_initialized) { 3998 // The super class was verified ahead of entering initializing, we should only be here if 3999 // the super class became erroneous due to initialization. 4000 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4001 << "Super class initialization failed for " 4002 << PrettyDescriptor(handle_scope_super.Get()) 4003 << " that has unexpected status " << handle_scope_super->GetStatus() 4004 << "\nPending exception:\n" 4005 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 4006 ObjectLock<mirror::Class> lock(self, klass); 4007 // Initialization failed because the super-class is erroneous. 4008 klass->SetStatus(mirror::Class::kStatusError, self); 4009 return false; 4010 } 4011 } 4012 } 4013 4014 if (klass->NumStaticFields() > 0) { 4015 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4016 CHECK(dex_class_def != NULL); 4017 const DexFile& dex_file = klass->GetDexFile(); 4018 StackHandleScope<3> hs(self); 4019 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4020 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4021 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4022 this, *dex_class_def); 4023 const byte* class_data = dex_file.GetClassData(*dex_class_def); 4024 ClassDataItemIterator field_it(dex_file, class_data); 4025 if (value_it.HasNext()) { 4026 DCHECK(field_it.HasNextStaticField()); 4027 CHECK(can_init_statics); 4028 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4029 StackHandleScope<1> hs(self); 4030 Handle<mirror::ArtField> field(hs.NewHandle( 4031 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4032 if (Runtime::Current()->IsActiveTransaction()) { 4033 value_it.ReadValueToField<true>(field); 4034 } else { 4035 value_it.ReadValueToField<false>(field); 4036 } 4037 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4038 } 4039 } 4040 } 4041 4042 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4043 if (clinit != NULL) { 4044 CHECK(can_init_statics); 4045 JValue result; 4046 clinit->Invoke(self, NULL, 0, &result, "V"); 4047 } 4048 4049 uint64_t t1 = NanoTime(); 4050 4051 bool success = true; 4052 { 4053 ObjectLock<mirror::Class> lock(self, klass); 4054 4055 if (self->IsExceptionPending()) { 4056 WrapExceptionInInitializer(); 4057 klass->SetStatus(mirror::Class::kStatusError, self); 4058 success = false; 4059 } else { 4060 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4061 RuntimeStats* thread_stats = self->GetStats(); 4062 ++global_stats->class_init_count; 4063 ++thread_stats->class_init_count; 4064 global_stats->class_init_time_ns += (t1 - t0); 4065 thread_stats->class_init_time_ns += (t1 - t0); 4066 // Set the class as initialized except if failed to initialize static fields. 4067 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4068 if (VLOG_IS_ON(class_linker)) { 4069 std::string temp; 4070 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4071 klass->GetLocation(); 4072 } 4073 // Opportunistically set static method trampolines to their destination. 4074 FixupStaticTrampolines(klass.Get()); 4075 } 4076 } 4077 return success; 4078} 4079 4080bool ClassLinker::WaitForInitializeClass(ConstHandle<mirror::Class> klass, Thread* self, 4081 ObjectLock<mirror::Class>& lock) 4082 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4083 while (true) { 4084 self->AssertNoPendingException(); 4085 CHECK(!klass->IsInitialized()); 4086 lock.WaitIgnoringInterrupts(); 4087 4088 // When we wake up, repeat the test for init-in-progress. If 4089 // there's an exception pending (only possible if 4090 // "interruptShouldThrow" was set), bail out. 4091 if (self->IsExceptionPending()) { 4092 WrapExceptionInInitializer(); 4093 klass->SetStatus(mirror::Class::kStatusError, self); 4094 return false; 4095 } 4096 // Spurious wakeup? Go back to waiting. 4097 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4098 continue; 4099 } 4100 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4101 // Compile time initialization failed. 4102 return false; 4103 } 4104 if (klass->IsErroneous()) { 4105 // The caller wants an exception, but it was thrown in a 4106 // different thread. Synthesize one here. 4107 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4108 PrettyDescriptor(klass.Get()).c_str()); 4109 return false; 4110 } 4111 if (klass->IsInitialized()) { 4112 return true; 4113 } 4114 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4115 << klass->GetStatus(); 4116 } 4117 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4118} 4119 4120bool ClassLinker::ValidateSuperClassDescriptors(ConstHandle<mirror::Class> klass) { 4121 if (klass->IsInterface()) { 4122 return true; 4123 } 4124 // Begin with the methods local to the superclass. 4125 StackHandleScope<2> hs(Thread::Current()); 4126 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4127 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4128 if (klass->HasSuperClass() && 4129 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4130 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4131 mh.ChangeMethod(klass->GetVTableEntry(i)); 4132 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4133 if (mh.GetMethod() != super_mh.GetMethod() && 4134 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4135 ThrowLinkageError(klass.Get(), 4136 "Class %s method %s resolves differently in superclass %s", 4137 PrettyDescriptor(klass.Get()).c_str(), 4138 PrettyMethod(mh.GetMethod()).c_str(), 4139 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4140 return false; 4141 } 4142 } 4143 } 4144 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4145 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4146 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4147 for (uint32_t j = 0; j < num_methods; ++j) { 4148 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4149 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4150 if (mh.GetMethod() != super_mh.GetMethod() && 4151 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4152 ThrowLinkageError(klass.Get(), 4153 "Class %s method %s resolves differently in interface %s", 4154 PrettyDescriptor(klass.Get()).c_str(), 4155 PrettyMethod(mh.GetMethod()).c_str(), 4156 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4157 return false; 4158 } 4159 } 4160 } 4161 } 4162 return true; 4163} 4164 4165bool ClassLinker::EnsureInitialized(ConstHandle<mirror::Class> c, bool can_init_fields, 4166 bool can_init_parents) { 4167 DCHECK(c.Get() != nullptr); 4168 if (c->IsInitialized()) { 4169 return true; 4170 } 4171 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4172 Thread* self = Thread::Current(); 4173 if (!success) { 4174 if (can_init_fields && can_init_parents) { 4175 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4176 } 4177 } else { 4178 self->AssertNoPendingException(); 4179 } 4180 return success; 4181} 4182 4183void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4184 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4185 if (fields != nullptr) { 4186 for (int index = 0; index < fields->GetLength(); index ++) { 4187 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4188 fields->Get(index)->SetDeclaringClass(new_class); 4189 } 4190 } 4191 } 4192 4193 fields = new_class->GetSFields(); 4194 if (fields != nullptr) { 4195 for (int index = 0; index < fields->GetLength(); index ++) { 4196 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4197 fields->Get(index)->SetDeclaringClass(new_class); 4198 } 4199 } 4200 } 4201 4202 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4203 if (methods != nullptr) { 4204 for (int index = 0; index < methods->GetLength(); index ++) { 4205 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4206 methods->Get(index)->SetDeclaringClass(new_class); 4207 } 4208 } 4209 } 4210 4211 methods = new_class->GetVirtualMethods(); 4212 if (methods != nullptr) { 4213 for (int index = 0; index < methods->GetLength(); index ++) { 4214 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4215 methods->Get(index)->SetDeclaringClass(new_class); 4216 } 4217 } 4218 } 4219} 4220 4221bool ClassLinker::LinkClass(Thread* self, const char* descriptor, ConstHandle<mirror::Class> klass, 4222 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces, 4223 mirror::Class** new_class) { 4224 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4225 4226 if (!LinkSuperClass(klass)) { 4227 return false; 4228 } 4229 if (!LinkMethods(self, klass, interfaces)) { 4230 return false; 4231 } 4232 if (!LinkInstanceFields(klass)) { 4233 return false; 4234 } 4235 size_t class_size; 4236 if (!LinkStaticFields(klass, &class_size)) { 4237 return false; 4238 } 4239 CreateReferenceInstanceOffsets(klass); 4240 CreateReferenceStaticOffsets(klass); 4241 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4242 4243 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4244 // We don't need to retire this class as it has no embedded tables or it was created the 4245 // correct size during class linker initialization. 4246 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4247 4248 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4249 klass->PopulateEmbeddedImtAndVTable(); 4250 } 4251 4252 // This will notify waiters on klass that saw the not yet resolved 4253 // class in the class_table_ during EnsureResolved. 4254 klass->SetStatus(mirror::Class::kStatusResolved, self); 4255 *new_class = klass.Get(); 4256 } else { 4257 CHECK(!klass->IsResolved()); 4258 // Retire the temporary class and create the correctly sized resolved class. 4259 *new_class = klass->CopyOf(self, class_size); 4260 if (UNLIKELY(*new_class == NULL)) { 4261 CHECK(self->IsExceptionPending()); // Expect an OOME. 4262 klass->SetStatus(mirror::Class::kStatusError, self); 4263 return false; 4264 } 4265 4266 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4267 StackHandleScope<1> hs(self); 4268 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4269 ObjectLock<mirror::Class> lock(self, new_class_h); 4270 4271 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4272 4273 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4274 CHECK(existing == NULL || existing == klass.Get()); 4275 4276 // This will notify waiters on temp class that saw the not yet resolved class in the 4277 // class_table_ during EnsureResolved. 4278 klass->SetStatus(mirror::Class::kStatusRetired, self); 4279 4280 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4281 // This will notify waiters on new_class that saw the not yet resolved 4282 // class in the class_table_ during EnsureResolved. 4283 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4284 } 4285 return true; 4286} 4287 4288bool ClassLinker::LoadSuperAndInterfaces(ConstHandle<mirror::Class> klass, const DexFile& dex_file) { 4289 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4290 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4291 uint16_t super_class_idx = class_def.superclass_idx_; 4292 if (super_class_idx != DexFile::kDexNoIndex16) { 4293 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4294 if (super_class == NULL) { 4295 DCHECK(Thread::Current()->IsExceptionPending()); 4296 return false; 4297 } 4298 // Verify 4299 if (!klass->CanAccess(super_class)) { 4300 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4301 PrettyDescriptor(super_class).c_str(), 4302 PrettyDescriptor(klass.Get()).c_str()); 4303 return false; 4304 } 4305 CHECK(super_class->IsResolved()); 4306 klass->SetSuperClass(super_class); 4307 } 4308 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4309 if (interfaces != NULL) { 4310 for (size_t i = 0; i < interfaces->Size(); i++) { 4311 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4312 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4313 if (interface == NULL) { 4314 DCHECK(Thread::Current()->IsExceptionPending()); 4315 return false; 4316 } 4317 // Verify 4318 if (!klass->CanAccess(interface)) { 4319 // TODO: the RI seemed to ignore this in my testing. 4320 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4321 PrettyDescriptor(interface).c_str(), 4322 PrettyDescriptor(klass.Get()).c_str()); 4323 return false; 4324 } 4325 } 4326 } 4327 // Mark the class as loaded. 4328 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4329 return true; 4330} 4331 4332bool ClassLinker::LinkSuperClass(ConstHandle<mirror::Class> klass) { 4333 CHECK(!klass->IsPrimitive()); 4334 mirror::Class* super = klass->GetSuperClass(); 4335 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4336 if (super != NULL) { 4337 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4338 return false; 4339 } 4340 return true; 4341 } 4342 if (super == NULL) { 4343 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4344 PrettyDescriptor(klass.Get()).c_str()); 4345 return false; 4346 } 4347 // Verify 4348 if (super->IsFinal() || super->IsInterface()) { 4349 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4350 PrettyDescriptor(super).c_str(), 4351 PrettyDescriptor(klass.Get()).c_str(), 4352 super->IsFinal() ? "declared final" : "an interface"); 4353 return false; 4354 } 4355 if (!klass->CanAccess(super)) { 4356 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4357 PrettyDescriptor(super).c_str(), 4358 PrettyDescriptor(klass.Get()).c_str()); 4359 return false; 4360 } 4361 4362 // Inherit kAccClassIsFinalizable from the superclass in case this 4363 // class doesn't override finalize. 4364 if (super->IsFinalizable()) { 4365 klass->SetFinalizable(); 4366 } 4367 4368 // Inherit reference flags (if any) from the superclass. 4369 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4370 if (reference_flags != 0) { 4371 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4372 } 4373 // Disallow custom direct subclasses of java.lang.ref.Reference. 4374 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4375 ThrowLinkageError(klass.Get(), 4376 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4377 PrettyDescriptor(klass.Get()).c_str()); 4378 return false; 4379 } 4380 4381 if (kIsDebugBuild) { 4382 // Ensure super classes are fully resolved prior to resolving fields.. 4383 while (super != NULL) { 4384 CHECK(super->IsResolved()); 4385 super = super->GetSuperClass(); 4386 } 4387 } 4388 return true; 4389} 4390 4391// Populate the class vtable and itable. Compute return type indices. 4392bool ClassLinker::LinkMethods(Thread* self, ConstHandle<mirror::Class> klass, 4393 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4394 if (klass->IsInterface()) { 4395 // No vtable. 4396 size_t count = klass->NumVirtualMethods(); 4397 if (!IsUint(16, count)) { 4398 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4399 return false; 4400 } 4401 for (size_t i = 0; i < count; ++i) { 4402 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4403 } 4404 // Link interface method tables 4405 return LinkInterfaceMethods(klass, interfaces); 4406 } else { 4407 // Link virtual and interface method tables 4408 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4409 } 4410 return true; 4411} 4412 4413bool ClassLinker::LinkVirtualMethods(Thread* self, ConstHandle<mirror::Class> klass) { 4414 if (klass->HasSuperClass()) { 4415 uint32_t max_count = klass->NumVirtualMethods() + 4416 klass->GetSuperClass()->GetVTableLength(); 4417 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4418 CHECK_LE(actual_count, max_count); 4419 StackHandleScope<4> hs(self); 4420 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4421 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4422 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4423 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4424 if (UNLIKELY(vtable.Get() == nullptr)) { 4425 CHECK(self->IsExceptionPending()); // OOME. 4426 return false; 4427 } 4428 int len = super_class->GetVTableLength(); 4429 for (int i = 0; i < len; i++) { 4430 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4431 } 4432 } else { 4433 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4434 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4435 if (UNLIKELY(vtable.Get() == nullptr)) { 4436 CHECK(self->IsExceptionPending()); // OOME. 4437 return false; 4438 } 4439 } 4440 4441 // See if any of our virtual methods override the superclass. 4442 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4443 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4444 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4445 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4446 local_mh.ChangeMethod(local_method); 4447 size_t j = 0; 4448 for (; j < actual_count; ++j) { 4449 mirror::ArtMethod* super_method = vtable->Get(j); 4450 super_mh.ChangeMethod(super_method); 4451 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4452 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4453 super_method->GetAccessFlags())) { 4454 if (super_method->IsFinal()) { 4455 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4456 PrettyMethod(local_method).c_str(), 4457 super_method->GetDeclaringClassDescriptor()); 4458 return false; 4459 } 4460 vtable->Set<false>(j, local_method); 4461 local_method->SetMethodIndex(j); 4462 break; 4463 } else { 4464 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4465 << " would have incorrectly overridden the package-private method in " 4466 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4467 } 4468 } 4469 } 4470 if (j == actual_count) { 4471 // Not overriding, append. 4472 vtable->Set<false>(actual_count, local_method); 4473 local_method->SetMethodIndex(actual_count); 4474 actual_count += 1; 4475 } 4476 } 4477 if (!IsUint(16, actual_count)) { 4478 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4479 return false; 4480 } 4481 // Shrink vtable if possible 4482 CHECK_LE(actual_count, max_count); 4483 if (actual_count < max_count) { 4484 vtable.Assign(vtable->CopyOf(self, actual_count)); 4485 if (UNLIKELY(vtable.Get() == NULL)) { 4486 CHECK(self->IsExceptionPending()); // OOME. 4487 return false; 4488 } 4489 } 4490 klass->SetVTable(vtable.Get()); 4491 } else { 4492 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4493 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4494 if (!IsUint(16, num_virtual_methods)) { 4495 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4496 return false; 4497 } 4498 StackHandleScope<1> hs(self); 4499 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4500 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4501 if (UNLIKELY(vtable.Get() == NULL)) { 4502 CHECK(self->IsExceptionPending()); // OOME. 4503 return false; 4504 } 4505 for (size_t i = 0; i < num_virtual_methods; ++i) { 4506 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4507 vtable->Set<false>(i, virtual_method); 4508 virtual_method->SetMethodIndex(i & 0xFFFF); 4509 } 4510 klass->SetVTable(vtable.Get()); 4511 } 4512 return true; 4513} 4514 4515bool ClassLinker::LinkInterfaceMethods(ConstHandle<mirror::Class> klass, 4516 ConstHandle<mirror::ObjectArray<mirror::Class>> interfaces) { 4517 Thread* const self = Thread::Current(); 4518 Runtime* const runtime = Runtime::Current(); 4519 // Set the imt table to be all conflicts by default. 4520 klass->SetImTable(runtime->GetDefaultImt()); 4521 size_t super_ifcount; 4522 if (klass->HasSuperClass()) { 4523 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4524 } else { 4525 super_ifcount = 0; 4526 } 4527 uint32_t num_interfaces = 4528 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4529 size_t ifcount = super_ifcount + num_interfaces; 4530 for (size_t i = 0; i < num_interfaces; i++) { 4531 mirror::Class* interface = 4532 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4533 interfaces->Get(i); 4534 ifcount += interface->GetIfTableCount(); 4535 } 4536 if (ifcount == 0) { 4537 // Class implements no interfaces. 4538 DCHECK_EQ(klass->GetIfTableCount(), 0); 4539 DCHECK(klass->GetIfTable() == NULL); 4540 return true; 4541 } 4542 if (ifcount == super_ifcount) { 4543 // Class implements same interfaces as parent, are any of these not marker interfaces? 4544 bool has_non_marker_interface = false; 4545 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4546 for (size_t i = 0; i < ifcount; ++i) { 4547 if (super_iftable->GetMethodArrayCount(i) > 0) { 4548 has_non_marker_interface = true; 4549 break; 4550 } 4551 } 4552 if (!has_non_marker_interface) { 4553 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4554 klass->SetIfTable(super_iftable); 4555 return true; 4556 } 4557 } 4558 StackHandleScope<5> hs(self); 4559 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4560 if (UNLIKELY(iftable.Get() == NULL)) { 4561 CHECK(self->IsExceptionPending()); // OOME. 4562 return false; 4563 } 4564 if (super_ifcount != 0) { 4565 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4566 for (size_t i = 0; i < super_ifcount; i++) { 4567 mirror::Class* super_interface = super_iftable->GetInterface(i); 4568 iftable->SetInterface(i, super_interface); 4569 } 4570 } 4571 // Flatten the interface inheritance hierarchy. 4572 size_t idx = super_ifcount; 4573 for (size_t i = 0; i < num_interfaces; i++) { 4574 mirror::Class* interface = 4575 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4576 interfaces->Get(i); 4577 DCHECK(interface != NULL); 4578 if (!interface->IsInterface()) { 4579 std::string temp; 4580 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4581 PrettyDescriptor(klass.Get()).c_str(), 4582 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4583 return false; 4584 } 4585 // Check if interface is already in iftable 4586 bool duplicate = false; 4587 for (size_t j = 0; j < idx; j++) { 4588 mirror::Class* existing_interface = iftable->GetInterface(j); 4589 if (existing_interface == interface) { 4590 duplicate = true; 4591 break; 4592 } 4593 } 4594 if (!duplicate) { 4595 // Add this non-duplicate interface. 4596 iftable->SetInterface(idx++, interface); 4597 // Add this interface's non-duplicate super-interfaces. 4598 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4599 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4600 bool super_duplicate = false; 4601 for (size_t k = 0; k < idx; k++) { 4602 mirror::Class* existing_interface = iftable->GetInterface(k); 4603 if (existing_interface == super_interface) { 4604 super_duplicate = true; 4605 break; 4606 } 4607 } 4608 if (!super_duplicate) { 4609 iftable->SetInterface(idx++, super_interface); 4610 } 4611 } 4612 } 4613 } 4614 // Shrink iftable in case duplicates were found 4615 if (idx < ifcount) { 4616 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4617 if (UNLIKELY(iftable.Get() == NULL)) { 4618 CHECK(self->IsExceptionPending()); // OOME. 4619 return false; 4620 } 4621 ifcount = idx; 4622 } else { 4623 CHECK_EQ(idx, ifcount); 4624 } 4625 klass->SetIfTable(iftable.Get()); 4626 4627 // If we're an interface, we don't need the vtable pointers, so we're done. 4628 if (klass->IsInterface()) { 4629 return true; 4630 } 4631 // Allocate imtable 4632 bool imtable_changed = false; 4633 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4634 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4635 if (UNLIKELY(imtable.Get() == NULL)) { 4636 CHECK(self->IsExceptionPending()); // OOME. 4637 return false; 4638 } 4639 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4640 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4641 size_t max_miranda_methods = 0; // The max size of miranda_list. 4642 for (size_t i = 0; i < ifcount; ++i) { 4643 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4644 } 4645 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4646 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4647 size_t miranda_list_size = 0; // The current size of miranda_list. 4648 for (size_t i = 0; i < ifcount; ++i) { 4649 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4650 if (num_methods > 0) { 4651 StackHandleScope<2> hs(self); 4652 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4653 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4654 if (UNLIKELY(method_array.Get() == nullptr)) { 4655 CHECK(self->IsExceptionPending()); // OOME. 4656 return false; 4657 } 4658 iftable->SetMethodArray(i, method_array.Get()); 4659 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4660 hs.NewHandle(klass->GetVTableDuringLinking())); 4661 for (size_t j = 0; j < num_methods; ++j) { 4662 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4663 int32_t k; 4664 // For each method listed in the interface's method list, find the 4665 // matching method in our class's method list. We want to favor the 4666 // subclass over the superclass, which just requires walking 4667 // back from the end of the vtable. (This only matters if the 4668 // superclass defines a private method and this class redefines 4669 // it -- otherwise it would use the same vtable slot. In .dex files 4670 // those don't end up in the virtual method table, so it shouldn't 4671 // matter which direction we go. We walk it backward anyway.) 4672 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4673 vtable_mh.ChangeMethod(vtable->Get(k)); 4674 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4675 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4676 ThrowIllegalAccessError( 4677 klass.Get(), 4678 "Method '%s' implementing interface method '%s' is not public", 4679 PrettyMethod(vtable_mh.Get()).c_str(), 4680 PrettyMethod(interface_mh.Get()).c_str()); 4681 return false; 4682 } 4683 method_array->Set<false>(j, vtable_mh.Get()); 4684 // Place method in imt if entry is empty, place conflict otherwise. 4685 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4686 if (imtable->Get(imt_index) == NULL) { 4687 imtable->Set<false>(imt_index, vtable_mh.Get()); 4688 imtable_changed = true; 4689 } else { 4690 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4691 } 4692 break; 4693 } 4694 } 4695 if (k < 0) { 4696 StackHandleScope<1> hs(self); 4697 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4698 for (size_t l = 0; l < miranda_list_size; ++l) { 4699 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4700 DCHECK(mir_method != nullptr); 4701 vtable_mh.ChangeMethod(mir_method); 4702 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4703 miranda_method.Assign(mir_method); 4704 break; 4705 } 4706 } 4707 if (miranda_method.Get() == NULL) { 4708 // Point the interface table at a phantom slot. 4709 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4710 if (UNLIKELY(miranda_method.Get() == NULL)) { 4711 CHECK(self->IsExceptionPending()); // OOME. 4712 return false; 4713 } 4714 DCHECK_LT(miranda_list_size, max_miranda_methods); 4715 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4716 } 4717 method_array->Set<false>(j, miranda_method.Get()); 4718 } 4719 } 4720 } 4721 } 4722 if (imtable_changed) { 4723 // Fill in empty entries in interface method table with conflict. 4724 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4725 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4726 if (imtable->Get(i) == NULL) { 4727 imtable->Set<false>(i, imt_conflict_method); 4728 } 4729 } 4730 klass->SetImTable(imtable.Get()); 4731 } 4732 if (miranda_list_size > 0) { 4733 int old_method_count = klass->NumVirtualMethods(); 4734 int new_method_count = old_method_count + miranda_list_size; 4735 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4736 if (old_method_count == 0) { 4737 virtuals = AllocArtMethodArray(self, new_method_count); 4738 } else { 4739 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4740 } 4741 if (UNLIKELY(virtuals == NULL)) { 4742 CHECK(self->IsExceptionPending()); // OOME. 4743 return false; 4744 } 4745 klass->SetVirtualMethods(virtuals); 4746 4747 StackHandleScope<1> hs(self); 4748 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4749 hs.NewHandle(klass->GetVTableDuringLinking())); 4750 CHECK(vtable.Get() != NULL); 4751 int old_vtable_count = vtable->GetLength(); 4752 int new_vtable_count = old_vtable_count + miranda_list_size; 4753 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4754 if (UNLIKELY(vtable.Get() == NULL)) { 4755 CHECK(self->IsExceptionPending()); // OOME. 4756 return false; 4757 } 4758 for (size_t i = 0; i < miranda_list_size; ++i) { 4759 mirror::ArtMethod* method = miranda_list->Get(i); 4760 // Leave the declaring class alone as type indices are relative to it 4761 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4762 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4763 klass->SetVirtualMethod(old_method_count + i, method); 4764 vtable->Set<false>(old_vtable_count + i, method); 4765 } 4766 // TODO: do not assign to the vtable field until it is fully constructed. 4767 klass->SetVTable(vtable.Get()); 4768 } 4769 4770 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4771 for (int i = 0; i < vtable->GetLength(); ++i) { 4772 CHECK(vtable->Get(i) != NULL); 4773 } 4774 4775// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4776 4777 return true; 4778} 4779 4780bool ClassLinker::LinkInstanceFields(ConstHandle<mirror::Class> klass) { 4781 CHECK(klass.Get() != NULL); 4782 return LinkFields(klass, false, nullptr); 4783} 4784 4785bool ClassLinker::LinkStaticFields(ConstHandle<mirror::Class> klass, size_t* class_size) { 4786 CHECK(klass.Get() != NULL); 4787 return LinkFields(klass, true, class_size); 4788} 4789 4790struct LinkFieldsComparator { 4791 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4792 } 4793 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4794 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4795 NO_THREAD_SAFETY_ANALYSIS { 4796 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4797 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4798 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4799 if (type1 != type2) { 4800 bool is_primitive1 = type1 != Primitive::kPrimNot; 4801 bool is_primitive2 = type2 != Primitive::kPrimNot; 4802 if (type1 != type2) { 4803 if (is_primitive1 && is_primitive2) { 4804 // Larger primitive types go first. 4805 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 4806 } else { 4807 // Reference always goes first. 4808 return !is_primitive1; 4809 } 4810 } 4811 } 4812 // same basic group? then sort by string. 4813 return strcmp(field1->GetName(), field2->GetName()) < 0; 4814 } 4815}; 4816 4817bool ClassLinker::LinkFields(ConstHandle<mirror::Class> klass, bool is_static, size_t* class_size) { 4818 size_t num_fields = 4819 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4820 4821 mirror::ObjectArray<mirror::ArtField>* fields = 4822 is_static ? klass->GetSFields() : klass->GetIFields(); 4823 4824 // Initialize field_offset 4825 MemberOffset field_offset(0); 4826 if (is_static) { 4827 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4828 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4829 // Static fields come after the embedded tables. 4830 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4831 0, 0, 0, 0, 0); 4832 } 4833 field_offset = MemberOffset(base); 4834 } else { 4835 mirror::Class* super_class = klass->GetSuperClass(); 4836 if (super_class != NULL) { 4837 CHECK(super_class->IsResolved()) 4838 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4839 field_offset = MemberOffset(super_class->GetObjectSize()); 4840 } 4841 } 4842 4843 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4844 4845 // we want a relatively stable order so that adding new fields 4846 // minimizes disruption of C++ version such as Class and Method. 4847 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4848 const char* old_no_suspend_cause = Thread::Current()->StartAssertNoThreadSuspension( 4849 "Naked ArtField references in deque"); 4850 for (size_t i = 0; i < num_fields; i++) { 4851 mirror::ArtField* f = fields->Get(i); 4852 CHECK(f != NULL) << PrettyClass(klass.Get()); 4853 grouped_and_sorted_fields.push_back(f); 4854 } 4855 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4856 LinkFieldsComparator()); 4857 4858 // References should be at the front. 4859 size_t current_field = 0; 4860 size_t num_reference_fields = 0; 4861 FieldGaps gaps; 4862 4863 for (; current_field < num_fields; current_field++) { 4864 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4865 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4866 bool isPrimitive = type != Primitive::kPrimNot; 4867 if (isPrimitive) { 4868 break; // past last reference, move on to the next phase 4869 } 4870 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 4871 MemberOffset old_offset = field_offset; 4872 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 4873 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 4874 } 4875 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 4876 grouped_and_sorted_fields.pop_front(); 4877 num_reference_fields++; 4878 fields->Set<false>(current_field, field); 4879 field->SetOffset(field_offset); 4880 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4881 } 4882 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 4883 // otherwise we could end up with suboptimal gap fills. 4884 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 4885 fields, &grouped_and_sorted_fields, &gaps); 4886 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 4887 fields, &grouped_and_sorted_fields, &gaps); 4888 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 4889 fields, &grouped_and_sorted_fields, &gaps); 4890 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 4891 fields, &grouped_and_sorted_fields, &gaps); 4892 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 4893 " fields."; 4894 4895 Thread::Current()->EndAssertNoThreadSuspension(old_no_suspend_cause); 4896 4897 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4898 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4899 // We know there are no non-reference fields in the Reference classes, and we know 4900 // that 'referent' is alphabetically last, so this is easy... 4901 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4902 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4903 --num_reference_fields; 4904 } 4905 4906 if (kIsDebugBuild) { 4907 // Make sure that all reference fields appear before 4908 // non-reference fields, and all double-wide fields are aligned. 4909 bool seen_non_ref = false; 4910 for (size_t i = 0; i < num_fields; i++) { 4911 mirror::ArtField* field = fields->Get(i); 4912 if (false) { // enable to debug field layout 4913 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4914 << " class=" << PrettyClass(klass.Get()) 4915 << " field=" << PrettyField(field) 4916 << " offset=" 4917 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4918 } 4919 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4920 bool is_primitive = type != Primitive::kPrimNot; 4921 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4922 strcmp("referent", field->GetName()) == 0) { 4923 is_primitive = true; // We lied above, so we have to expect a lie here. 4924 } 4925 if (is_primitive) { 4926 if (!seen_non_ref) { 4927 seen_non_ref = true; 4928 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4929 } 4930 } else { 4931 DCHECK(!seen_non_ref) << PrettyField(field); 4932 } 4933 } 4934 if (!seen_non_ref) { 4935 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4936 } 4937 } 4938 4939 size_t size = field_offset.Uint32Value(); 4940 // Update klass 4941 if (is_static) { 4942 klass->SetNumReferenceStaticFields(num_reference_fields); 4943 *class_size = size; 4944 } else { 4945 klass->SetNumReferenceInstanceFields(num_reference_fields); 4946 if (!klass->IsVariableSize()) { 4947 std::string temp; 4948 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4949 size_t previous_size = klass->GetObjectSize(); 4950 if (previous_size != 0) { 4951 // Make sure that we didn't originally have an incorrect size. 4952 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4953 } 4954 klass->SetObjectSize(size); 4955 } 4956 } 4957 return true; 4958} 4959 4960// Set the bitmap of reference offsets, refOffsets, from the ifields 4961// list. 4962void ClassLinker::CreateReferenceInstanceOffsets(ConstHandle<mirror::Class> klass) { 4963 uint32_t reference_offsets = 0; 4964 mirror::Class* super_class = klass->GetSuperClass(); 4965 if (super_class != NULL) { 4966 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4967 // If our superclass overflowed, we don't stand a chance. 4968 if (reference_offsets == CLASS_WALK_SUPER) { 4969 klass->SetReferenceInstanceOffsets(reference_offsets); 4970 return; 4971 } 4972 } 4973 CreateReferenceOffsets(klass, false, reference_offsets); 4974} 4975 4976void ClassLinker::CreateReferenceStaticOffsets(ConstHandle<mirror::Class> klass) { 4977 CreateReferenceOffsets(klass, true, 0); 4978} 4979 4980void ClassLinker::CreateReferenceOffsets(ConstHandle<mirror::Class> klass, bool is_static, 4981 uint32_t reference_offsets) { 4982 size_t num_reference_fields = 4983 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4984 : klass->NumReferenceInstanceFieldsDuringLinking(); 4985 mirror::ObjectArray<mirror::ArtField>* fields = 4986 is_static ? klass->GetSFields() : klass->GetIFields(); 4987 // All of the fields that contain object references are guaranteed 4988 // to be at the beginning of the fields list. 4989 for (size_t i = 0; i < num_reference_fields; ++i) { 4990 // Note that byte_offset is the offset from the beginning of 4991 // object, not the offset into instance data 4992 mirror::ArtField* field = fields->Get(i); 4993 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4994 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4995 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4996 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4997 CHECK_NE(new_bit, 0U); 4998 reference_offsets |= new_bit; 4999 } else { 5000 reference_offsets = CLASS_WALK_SUPER; 5001 break; 5002 } 5003 } 5004 // Update fields in klass 5005 if (is_static) { 5006 klass->SetReferenceStaticOffsets(reference_offsets); 5007 } else { 5008 klass->SetReferenceInstanceOffsets(reference_offsets); 5009 } 5010} 5011 5012mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5013 ConstHandle<mirror::DexCache> dex_cache) { 5014 DCHECK(dex_cache.Get() != nullptr); 5015 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5016 if (resolved != NULL) { 5017 return resolved; 5018 } 5019 uint32_t utf16_length; 5020 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5021 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5022 dex_cache->SetResolvedString(string_idx, string); 5023 return string; 5024} 5025 5026mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5027 mirror::Class* referrer) { 5028 StackHandleScope<2> hs(Thread::Current()); 5029 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5030 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5031 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5032} 5033 5034mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5035 ConstHandle<mirror::DexCache> dex_cache, 5036 ConstHandle<mirror::ClassLoader> class_loader) { 5037 DCHECK(dex_cache.Get() != NULL); 5038 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5039 if (resolved == NULL) { 5040 Thread* self = Thread::Current(); 5041 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5042 resolved = FindClass(self, descriptor, class_loader); 5043 if (resolved != NULL) { 5044 // TODO: we used to throw here if resolved's class loader was not the 5045 // boot class loader. This was to permit different classes with the 5046 // same name to be loaded simultaneously by different loaders 5047 dex_cache->SetResolvedType(type_idx, resolved); 5048 } else { 5049 CHECK(self->IsExceptionPending()) 5050 << "Expected pending exception for failed resolution of: " << descriptor; 5051 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5052 StackHandleScope<1> hs(self); 5053 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5054 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5055 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5056 self->ClearException(); 5057 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5058 self->GetException(NULL)->SetCause(cause.Get()); 5059 } 5060 } 5061 } 5062 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5063 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5064 return resolved; 5065} 5066 5067mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5068 ConstHandle<mirror::DexCache> dex_cache, 5069 ConstHandle<mirror::ClassLoader> class_loader, 5070 ConstHandle<mirror::ArtMethod> referrer, 5071 InvokeType type) { 5072 DCHECK(dex_cache.Get() != nullptr); 5073 // Check for hit in the dex cache. 5074 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5075 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5076 return resolved; 5077 } 5078 // Fail, get the declaring class. 5079 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5080 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5081 if (klass == nullptr) { 5082 DCHECK(Thread::Current()->IsExceptionPending()); 5083 return nullptr; 5084 } 5085 // Scan using method_idx, this saves string compares but will only hit for matching dex 5086 // caches/files. 5087 switch (type) { 5088 case kDirect: // Fall-through. 5089 case kStatic: 5090 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5091 break; 5092 case kInterface: 5093 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5094 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5095 break; 5096 case kSuper: // Fall-through. 5097 case kVirtual: 5098 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5099 break; 5100 default: 5101 LOG(FATAL) << "Unreachable - invocation type: " << type; 5102 } 5103 if (resolved == nullptr) { 5104 // Search by name, which works across dex files. 5105 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5106 const Signature signature = dex_file.GetMethodSignature(method_id); 5107 switch (type) { 5108 case kDirect: // Fall-through. 5109 case kStatic: 5110 resolved = klass->FindDirectMethod(name, signature); 5111 break; 5112 case kInterface: 5113 resolved = klass->FindInterfaceMethod(name, signature); 5114 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5115 break; 5116 case kSuper: // Fall-through. 5117 case kVirtual: 5118 resolved = klass->FindVirtualMethod(name, signature); 5119 break; 5120 } 5121 } 5122 // If we found a method, check for incompatible class changes. 5123 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5124 // Be a good citizen and update the dex cache to speed subsequent calls. 5125 dex_cache->SetResolvedMethod(method_idx, resolved); 5126 return resolved; 5127 } else { 5128 // If we had a method, it's an incompatible-class-change error. 5129 if (resolved != nullptr) { 5130 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5131 } else { 5132 // We failed to find the method which means either an access error, an incompatible class 5133 // change, or no such method. First try to find the method among direct and virtual methods. 5134 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5135 const Signature signature = dex_file.GetMethodSignature(method_id); 5136 switch (type) { 5137 case kDirect: 5138 case kStatic: 5139 resolved = klass->FindVirtualMethod(name, signature); 5140 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5141 // have had a resolved method before, which triggers the "true" branch above. 5142 break; 5143 case kInterface: 5144 case kVirtual: 5145 case kSuper: 5146 resolved = klass->FindDirectMethod(name, signature); 5147 break; 5148 } 5149 5150 // If we found something, check that it can be accessed by the referrer. 5151 if (resolved != nullptr && referrer.Get() != nullptr) { 5152 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5153 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5154 if (!referring_class->CanAccess(methods_class)) { 5155 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5156 resolved, type); 5157 return nullptr; 5158 } else if (!referring_class->CanAccessMember(methods_class, 5159 resolved->GetAccessFlags())) { 5160 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5161 return nullptr; 5162 } 5163 } 5164 5165 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5166 // methods and throw if we find the method there. If we find nothing, throw a 5167 // NoSuchMethodError. 5168 switch (type) { 5169 case kDirect: 5170 case kStatic: 5171 if (resolved != nullptr) { 5172 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5173 } else { 5174 resolved = klass->FindInterfaceMethod(name, signature); 5175 if (resolved != nullptr) { 5176 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5177 } else { 5178 ThrowNoSuchMethodError(type, klass, name, signature); 5179 } 5180 } 5181 break; 5182 case kInterface: 5183 if (resolved != nullptr) { 5184 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5185 } else { 5186 resolved = klass->FindVirtualMethod(name, signature); 5187 if (resolved != nullptr) { 5188 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5189 } else { 5190 ThrowNoSuchMethodError(type, klass, name, signature); 5191 } 5192 } 5193 break; 5194 case kSuper: 5195 if (resolved != nullptr) { 5196 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5197 } else { 5198 ThrowNoSuchMethodError(type, klass, name, signature); 5199 } 5200 break; 5201 case kVirtual: 5202 if (resolved != nullptr) { 5203 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5204 } else { 5205 resolved = klass->FindInterfaceMethod(name, signature); 5206 if (resolved != nullptr) { 5207 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5208 } else { 5209 ThrowNoSuchMethodError(type, klass, name, signature); 5210 } 5211 } 5212 break; 5213 } 5214 } 5215 DCHECK(Thread::Current()->IsExceptionPending()); 5216 return nullptr; 5217 } 5218} 5219 5220mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5221 ConstHandle<mirror::DexCache> dex_cache, 5222 ConstHandle<mirror::ClassLoader> class_loader, 5223 bool is_static) { 5224 DCHECK(dex_cache.Get() != nullptr); 5225 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5226 if (resolved != nullptr) { 5227 return resolved; 5228 } 5229 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5230 Thread* const self = Thread::Current(); 5231 StackHandleScope<1> hs(self); 5232 Handle<mirror::Class> klass( 5233 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5234 if (klass.Get() == nullptr) { 5235 DCHECK(Thread::Current()->IsExceptionPending()); 5236 return nullptr; 5237 } 5238 5239 if (is_static) { 5240 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5241 } else { 5242 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5243 } 5244 5245 if (resolved == nullptr) { 5246 const char* name = dex_file.GetFieldName(field_id); 5247 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5248 if (is_static) { 5249 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5250 } else { 5251 resolved = klass->FindInstanceField(name, type); 5252 } 5253 if (resolved == nullptr) { 5254 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5255 return NULL; 5256 } 5257 } 5258 dex_cache->SetResolvedField(field_idx, resolved); 5259 return resolved; 5260} 5261 5262mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5263 uint32_t field_idx, 5264 ConstHandle<mirror::DexCache> dex_cache, 5265 ConstHandle<mirror::ClassLoader> class_loader) { 5266 DCHECK(dex_cache.Get() != nullptr); 5267 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5268 if (resolved != nullptr) { 5269 return resolved; 5270 } 5271 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5272 Thread* self = Thread::Current(); 5273 StackHandleScope<1> hs(self); 5274 Handle<mirror::Class> klass( 5275 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5276 if (klass.Get() == NULL) { 5277 DCHECK(Thread::Current()->IsExceptionPending()); 5278 return NULL; 5279 } 5280 5281 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5282 StringPiece type(dex_file.StringDataByIdx( 5283 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5284 resolved = mirror::Class::FindField(self, klass, name, type); 5285 if (resolved != NULL) { 5286 dex_cache->SetResolvedField(field_idx, resolved); 5287 } else { 5288 ThrowNoSuchFieldError("", klass.Get(), type, name); 5289 } 5290 return resolved; 5291} 5292 5293const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5294 uint32_t* length) { 5295 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5296 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5297 const DexFile& dex_file = *dex_cache->GetDexFile(); 5298 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5299 return dex_file.GetMethodShorty(method_id, length); 5300} 5301 5302void ClassLinker::DumpAllClasses(int flags) { 5303 if (dex_cache_image_class_lookup_required_) { 5304 MoveImageClassesToClassTable(); 5305 } 5306 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5307 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5308 std::vector<mirror::Class*> all_classes; 5309 { 5310 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5311 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5312 mirror::Class* klass = it.second.Read(); 5313 all_classes.push_back(klass); 5314 } 5315 } 5316 5317 for (size_t i = 0; i < all_classes.size(); ++i) { 5318 all_classes[i]->DumpClass(std::cerr, flags); 5319 } 5320} 5321 5322void ClassLinker::DumpForSigQuit(std::ostream& os) { 5323 if (dex_cache_image_class_lookup_required_) { 5324 MoveImageClassesToClassTable(); 5325 } 5326 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5327 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5328} 5329 5330size_t ClassLinker::NumLoadedClasses() { 5331 if (dex_cache_image_class_lookup_required_) { 5332 MoveImageClassesToClassTable(); 5333 } 5334 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5335 return class_table_.size(); 5336} 5337 5338pid_t ClassLinker::GetClassesLockOwner() { 5339 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5340} 5341 5342pid_t ClassLinker::GetDexLockOwner() { 5343 return dex_lock_.GetExclusiveOwnerTid(); 5344} 5345 5346void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5347 DCHECK(!init_done_); 5348 5349 DCHECK(klass != NULL); 5350 DCHECK(klass->GetClassLoader() == NULL); 5351 5352 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5353 DCHECK(class_roots != NULL); 5354 DCHECK(class_roots->Get(class_root) == NULL); 5355 class_roots->Set<false>(class_root, klass); 5356} 5357 5358} // namespace art 5359