class_linker.cc revision c8ccf68b805c92674545f63e0341ba47e8d9701c
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <memory> 21#include <queue> 22#include <string> 23#include <utility> 24#include <vector> 25 26#include "base/casts.h" 27#include "base/logging.h" 28#include "base/scoped_flock.h" 29#include "base/stl_util.h" 30#include "base/unix_file/fd_file.h" 31#include "class_linker-inl.h" 32#include "compiler_callbacks.h" 33#include "debugger.h" 34#include "dex_file-inl.h" 35#include "gc_root-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "method_helper-inl.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "object_lock.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/dex_cache-inl.h" 54#include "mirror/iftable-inl.h" 55#include "mirror/object-inl.h" 56#include "mirror/object_array-inl.h" 57#include "mirror/proxy.h" 58#include "mirror/reference-inl.h" 59#include "mirror/stack_trace_element.h" 60#include "mirror/string-inl.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread-inl.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 Runtime* runtime = Runtime::Current(); 93 bool is_compiler = runtime->IsCompiler(); 94 if (!is_compiler) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 if (is_compiler) { 101 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 102 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 103 self->SetException(ThrowLocation(), pre_allocated); 104 } else { 105 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 106 if (c->GetVerifyErrorClass() != NULL) { 107 // TODO: change the verifier to store an _instance_, with a useful detail message? 108 std::string temp; 109 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 110 PrettyDescriptor(c).c_str()); 111 } else { 112 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 113 PrettyDescriptor(c).c_str()); 114 } 115 } 116} 117 118static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 119 Thread* self = Thread::Current(); 120 JNIEnv* env = self->GetJniEnv(); 121 122 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 123 CHECK(cause.get() != nullptr); 124 125 env->ExceptionClear(); 126 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 127 env->Throw(cause.get()); 128 129 // We only wrap non-Error exceptions; an Error can just be used as-is. 130 if (!is_error) { 131 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 132 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 133 nullptr); 134 } 135} 136 137static size_t Hash(const char* s) { 138 // This is the java.lang.String hashcode for convenience, not interoperability. 139 size_t hash = 0; 140 for (; *s != '\0'; ++s) { 141 hash = hash * 31 + *s; 142 } 143 return hash; 144} 145 146// Gap between two fields in object layout. 147struct FieldGap { 148 uint32_t start_offset; // The offset from the start of the object. 149 uint32_t size; // The gap size of 1, 2, or 4 bytes. 150}; 151struct FieldGapsComparator { 152 explicit FieldGapsComparator() { 153 } 154 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 155 NO_THREAD_SAFETY_ANALYSIS { 156 // Sort by gap size, largest first. 157 return lhs.size > rhs.size; 158 } 159}; 160typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 161 162// Adds largest aligned gaps to queue of gaps. 163void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 164 DCHECK(gaps != nullptr); 165 166 uint32_t current_offset = gap_start; 167 while (current_offset != gap_end) { 168 size_t remaining = gap_end - current_offset; 169 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 170 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 171 current_offset += sizeof(uint32_t); 172 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 173 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 174 current_offset += sizeof(uint16_t); 175 } else { 176 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 177 current_offset += sizeof(uint8_t); 178 } 179 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 180 } 181} 182// Shuffle fields forward, making use of gaps whenever possible. 183template<int n> 184static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 185 MemberOffset* field_offset, 186 mirror::ObjectArray<mirror::ArtField>* fields, 187 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 188 FieldGaps* gaps) 189 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 190 DCHECK(current_field_idx != nullptr); 191 DCHECK(grouped_and_sorted_fields != nullptr); 192 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 193 DCHECK(gaps != nullptr); 194 DCHECK(field_offset != nullptr); 195 196 DCHECK(IsPowerOfTwo(n)); 197 while (!grouped_and_sorted_fields->empty()) { 198 mirror::ArtField* field = grouped_and_sorted_fields->front(); 199 Primitive::Type type = field->GetTypeAsPrimitiveType(); 200 if (Primitive::ComponentSize(type) < n) { 201 break; 202 } 203 if (!IsAligned<n>(field_offset->Uint32Value())) { 204 MemberOffset old_offset = *field_offset; 205 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 206 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 207 } 208 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 209 grouped_and_sorted_fields->pop_front(); 210 fields->Set<false>(*current_field_idx, field); 211 if (!gaps->empty() && gaps->top().size >= n) { 212 FieldGap gap = gaps->top(); 213 gaps->pop(); 214 DCHECK(IsAligned<n>(gap.start_offset)); 215 field->SetOffset(MemberOffset(gap.start_offset)); 216 if (gap.size > n) { 217 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 218 } 219 } else { 220 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 221 field->SetOffset(*field_offset); 222 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 223 } 224 ++(*current_field_idx); 225 } 226} 227 228const char* ClassLinker::class_roots_descriptors_[] = { 229 "Ljava/lang/Class;", 230 "Ljava/lang/Object;", 231 "[Ljava/lang/Class;", 232 "[Ljava/lang/Object;", 233 "Ljava/lang/String;", 234 "Ljava/lang/DexCache;", 235 "Ljava/lang/ref/Reference;", 236 "Ljava/lang/reflect/ArtField;", 237 "Ljava/lang/reflect/ArtMethod;", 238 "Ljava/lang/reflect/Proxy;", 239 "[Ljava/lang/String;", 240 "[Ljava/lang/reflect/ArtField;", 241 "[Ljava/lang/reflect/ArtMethod;", 242 "Ljava/lang/ClassLoader;", 243 "Ljava/lang/Throwable;", 244 "Ljava/lang/ClassNotFoundException;", 245 "Ljava/lang/StackTraceElement;", 246 "Z", 247 "B", 248 "C", 249 "D", 250 "F", 251 "I", 252 "J", 253 "S", 254 "V", 255 "[Z", 256 "[B", 257 "[C", 258 "[D", 259 "[F", 260 "[I", 261 "[J", 262 "[S", 263 "[Ljava/lang/StackTraceElement;", 264}; 265 266ClassLinker::ClassLinker(InternTable* intern_table) 267 // dex_lock_ is recursive as it may be used in stack dumping. 268 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 269 dex_cache_image_class_lookup_required_(false), 270 failed_dex_cache_class_lookups_(0), 271 class_roots_(nullptr), 272 array_iftable_(nullptr), 273 find_array_class_cache_next_victim_(0), 274 init_done_(false), 275 log_new_dex_caches_roots_(false), 276 log_new_class_table_roots_(false), 277 intern_table_(intern_table), 278 portable_resolution_trampoline_(nullptr), 279 quick_resolution_trampoline_(nullptr), 280 portable_imt_conflict_trampoline_(nullptr), 281 quick_imt_conflict_trampoline_(nullptr), 282 quick_generic_jni_trampoline_(nullptr), 283 quick_to_interpreter_bridge_trampoline_(nullptr) { 284 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 285 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 286} 287 288// To set a value for generic JNI. May be necessary in compiler tests. 289extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 290extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 291extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 292extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 293 294void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 295 VLOG(startup) << "ClassLinker::Init"; 296 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 297 298 CHECK(!init_done_); 299 300 // java_lang_Class comes first, it's needed for AllocClass 301 Thread* self = Thread::Current(); 302 gc::Heap* heap = Runtime::Current()->GetHeap(); 303 // The GC can't handle an object with a null class since we can't get the size of this object. 304 heap->IncrementDisableMovingGC(self); 305 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 306 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 307 heap->AllocNonMovableObject<true>(self, nullptr, 308 mirror::Class::ClassClassSize(), 309 VoidFunctor())))); 310 CHECK(java_lang_Class.Get() != nullptr); 311 mirror::Class::SetClassClass(java_lang_Class.Get()); 312 java_lang_Class->SetClass(java_lang_Class.Get()); 313 if (kUseBakerOrBrooksReadBarrier) { 314 java_lang_Class->AssertReadBarrierPointer(); 315 } 316 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 317 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 318 heap->DecrementDisableMovingGC(self); 319 // AllocClass(mirror::Class*) can now be used 320 321 // Class[] is used for reflection support. 322 Handle<mirror::Class> class_array_class(hs.NewHandle( 323 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 324 class_array_class->SetComponentType(java_lang_Class.Get()); 325 326 // java_lang_Object comes next so that object_array_class can be created. 327 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 328 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 329 CHECK(java_lang_Object.Get() != nullptr); 330 // backfill Object as the super class of Class. 331 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 332 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 333 334 // Object[] next to hold class roots. 335 Handle<mirror::Class> object_array_class(hs.NewHandle( 336 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 337 object_array_class->SetComponentType(java_lang_Object.Get()); 338 339 // Setup the char (primitive) class to be used for char[]. 340 Handle<mirror::Class> char_class(hs.NewHandle( 341 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 342 // The primitive char class won't be initialized by 343 // InitializePrimitiveClass until line 459, but strings (and 344 // internal char arrays) will be allocated before that and the 345 // component size, which is computed from the primitive type, needs 346 // to be set here. 347 char_class->SetPrimitiveType(Primitive::kPrimChar); 348 349 // Setup the char[] class to be used for String. 350 Handle<mirror::Class> char_array_class(hs.NewHandle( 351 AllocClass(self, java_lang_Class.Get(), 352 mirror::Array::ClassSize()))); 353 char_array_class->SetComponentType(char_class.Get()); 354 mirror::CharArray::SetArrayClass(char_array_class.Get()); 355 356 // Setup String. 357 Handle<mirror::Class> java_lang_String(hs.NewHandle( 358 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 359 mirror::String::SetClass(java_lang_String.Get()); 360 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 361 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 362 363 // Setup Reference. 364 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 365 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 366 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 367 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 368 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 369 370 // Create storage for root classes, save away our work so far (requires descriptors). 371 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 372 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 373 kClassRootsMax)); 374 CHECK(!class_roots_.IsNull()); 375 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 376 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 377 SetClassRoot(kClassArrayClass, class_array_class.Get()); 378 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 379 SetClassRoot(kCharArrayClass, char_array_class.Get()); 380 SetClassRoot(kJavaLangString, java_lang_String.Get()); 381 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 382 383 // Setup the primitive type classes. 384 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 385 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 386 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 387 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 388 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 389 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 390 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 391 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 392 393 // Create array interface entries to populate once we can load system classes. 394 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 395 396 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 397 Handle<mirror::Class> int_array_class(hs.NewHandle( 398 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 399 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 400 mirror::IntArray::SetArrayClass(int_array_class.Get()); 401 SetClassRoot(kIntArrayClass, int_array_class.Get()); 402 403 // now that these are registered, we can use AllocClass() and AllocObjectArray 404 405 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 406 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 408 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 409 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 410 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 411 412 // Constructor, Field, Method, and AbstractMethod are necessary so 413 // that FindClass can link members. 414 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 415 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 416 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 417 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 418 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 419 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 420 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 421 422 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 423 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 424 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 425 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 426 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 427 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 428 429 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 430 431 // Set up array classes for string, field, method 432 Handle<mirror::Class> object_array_string(hs.NewHandle( 433 AllocClass(self, java_lang_Class.Get(), 434 mirror::ObjectArray<mirror::String>::ClassSize()))); 435 object_array_string->SetComponentType(java_lang_String.Get()); 436 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 437 438 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 439 AllocClass(self, java_lang_Class.Get(), 440 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 441 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 442 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 443 444 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 445 AllocClass(self, java_lang_Class.Get(), 446 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 447 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 448 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 449 450 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 451 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 452 // these roots. 453 CHECK_NE(0U, boot_class_path.size()); 454 for (size_t i = 0; i != boot_class_path.size(); ++i) { 455 const DexFile* dex_file = boot_class_path[i]; 456 CHECK(dex_file != nullptr); 457 AppendToBootClassPath(self, *dex_file); 458 } 459 460 // now we can use FindSystemClass 461 462 // run char class through InitializePrimitiveClass to finish init 463 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 464 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 465 466 // Create runtime resolution and imt conflict methods. Also setup the default imt. 467 Runtime* runtime = Runtime::Current(); 468 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 469 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 470 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 471 472 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 473 // we do not need friend classes or a publicly exposed setter. 474 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 475 if (!runtime->IsCompiler()) { 476 // We need to set up the generic trampolines since we don't have an image. 477 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 478 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 479 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 480 } 481 482 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 483 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 484 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 485 CHECK_EQ(java_lang_Object.Get(), Object_class); 486 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 487 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 488 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 489 std::ostringstream os1, os2; 490 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 491 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 492 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 493 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 494 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 495 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 496 CHECK_EQ(java_lang_String.Get(), String_class); 497 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 498 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 499 500 // Setup the primitive array type classes - can't be done until Object has a vtable. 501 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 502 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 503 504 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 505 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 506 507 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 508 CHECK_EQ(char_array_class.Get(), found_char_array_class); 509 510 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 511 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 512 513 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 514 CHECK_EQ(int_array_class.Get(), found_int_array_class); 515 516 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 517 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 518 519 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 520 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 521 522 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 523 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 524 525 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 526 CHECK_EQ(class_array_class.Get(), found_class_array_class); 527 528 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 529 CHECK_EQ(object_array_class.Get(), found_object_array_class); 530 531 // Setup the single, global copy of "iftable". 532 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 533 CHECK(java_lang_Cloneable != nullptr); 534 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 535 CHECK(java_io_Serializable != nullptr); 536 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 537 // crawl up and explicitly list all of the supers as well. 538 { 539 mirror::IfTable* array_iftable = array_iftable_.Read(); 540 array_iftable->SetInterface(0, java_lang_Cloneable); 541 array_iftable->SetInterface(1, java_io_Serializable); 542 } 543 544 // Sanity check Class[] and Object[]'s interfaces. 545 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 546 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 547 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 548 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 549 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 550 // dex_cache_ fields and register them in class_table_. 551 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 552 CHECK_EQ(java_lang_Class.Get(), Class_class); 553 554 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 555 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 556 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 557 558 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 559 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 560 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 561 562 mirror::Class* String_array_class = 563 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 564 CHECK_EQ(object_array_string.Get(), String_array_class); 565 566 mirror::Class* Art_method_array_class = 567 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 568 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 569 570 mirror::Class* Art_field_array_class = 571 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 572 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 573 574 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 575 576 // Create java.lang.reflect.Proxy root. 577 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 578 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 579 580 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 581 // finish initializing Reference class 582 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 583 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 584 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 585 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 586 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 587 mirror::Class* java_lang_ref_FinalizerReference = 588 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 589 java_lang_ref_FinalizerReference->SetAccessFlags( 590 java_lang_ref_FinalizerReference->GetAccessFlags() | 591 kAccClassIsReference | kAccClassIsFinalizerReference); 592 mirror::Class* java_lang_ref_PhantomReference = 593 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 594 java_lang_ref_PhantomReference->SetAccessFlags( 595 java_lang_ref_PhantomReference->GetAccessFlags() | 596 kAccClassIsReference | kAccClassIsPhantomReference); 597 mirror::Class* java_lang_ref_SoftReference = 598 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 599 java_lang_ref_SoftReference->SetAccessFlags( 600 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 601 mirror::Class* java_lang_ref_WeakReference = 602 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 603 java_lang_ref_WeakReference->SetAccessFlags( 604 java_lang_ref_WeakReference->GetAccessFlags() | 605 kAccClassIsReference | kAccClassIsWeakReference); 606 607 // Setup the ClassLoader, verifying the object_size_. 608 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 609 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 610 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 611 612 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 613 // java.lang.StackTraceElement as a convenience. 614 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 615 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 616 SetClassRoot(kJavaLangClassNotFoundException, 617 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 618 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 619 SetClassRoot(kJavaLangStackTraceElementArrayClass, 620 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 621 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 622 623 FinishInit(self); 624 625 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 626} 627 628void ClassLinker::FinishInit(Thread* self) { 629 VLOG(startup) << "ClassLinker::FinishInit entering"; 630 631 // Let the heap know some key offsets into java.lang.ref instances 632 // Note: we hard code the field indexes here rather than using FindInstanceField 633 // as the types of the field can't be resolved prior to the runtime being 634 // fully initialized 635 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 636 mirror::Class* java_lang_ref_FinalizerReference = 637 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 638 639 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 640 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 641 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 642 643 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 644 CHECK_STREQ(queue->GetName(), "queue"); 645 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 646 647 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 648 CHECK_STREQ(queueNext->GetName(), "queueNext"); 649 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 650 651 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 652 CHECK_STREQ(referent->GetName(), "referent"); 653 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 654 655 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 656 CHECK_STREQ(zombie->GetName(), "zombie"); 657 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 658 659 // ensure all class_roots_ are initialized 660 for (size_t i = 0; i < kClassRootsMax; i++) { 661 ClassRoot class_root = static_cast<ClassRoot>(i); 662 mirror::Class* klass = GetClassRoot(class_root); 663 CHECK(klass != nullptr); 664 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 665 // note SetClassRoot does additional validation. 666 // if possible add new checks there to catch errors early 667 } 668 669 CHECK(!array_iftable_.IsNull()); 670 671 // disable the slow paths in FindClass and CreatePrimitiveClass now 672 // that Object, Class, and Object[] are setup 673 init_done_ = true; 674 675 VLOG(startup) << "ClassLinker::FinishInit exiting"; 676} 677 678void ClassLinker::RunRootClinits() { 679 Thread* self = Thread::Current(); 680 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 681 mirror::Class* c = GetClassRoot(ClassRoot(i)); 682 if (!c->IsArrayClass() && !c->IsPrimitive()) { 683 StackHandleScope<1> hs(self); 684 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 685 EnsureInitialized(self, h_class, true, true); 686 self->AssertNoPendingException(); 687 } 688 } 689} 690 691bool ClassLinker::GenerateOatFile(const char* dex_filename, 692 int oat_fd, 693 const char* oat_cache_filename, 694 std::string* error_msg) { 695 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 696 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 697 698 gc::Heap* heap = Runtime::Current()->GetHeap(); 699 std::string boot_image_option("--boot-image="); 700 if (heap->GetImageSpace() == nullptr) { 701 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 702 // out of space anyway it might not matter. 703 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 704 "without an image.", dex_filename); 705 return false; 706 } 707 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 708 709 std::string dex_file_option("--dex-file="); 710 dex_file_option += dex_filename; 711 712 std::string oat_fd_option("--oat-fd="); 713 StringAppendF(&oat_fd_option, "%d", oat_fd); 714 715 std::string oat_location_option("--oat-location="); 716 oat_location_option += oat_cache_filename; 717 718 std::vector<std::string> argv; 719 argv.push_back(dex2oat); 720 argv.push_back("--runtime-arg"); 721 argv.push_back("-classpath"); 722 argv.push_back("--runtime-arg"); 723 argv.push_back(Runtime::Current()->GetClassPathString()); 724 725 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 726 727 if (!Runtime::Current()->IsVerificationEnabled()) { 728 argv.push_back("--compiler-filter=verify-none"); 729 } 730 731 if (Runtime::Current()->MustRelocateIfPossible()) { 732 argv.push_back("--runtime-arg"); 733 argv.push_back("-Xrelocate"); 734 } else { 735 argv.push_back("--runtime-arg"); 736 argv.push_back("-Xnorelocate"); 737 } 738 739 if (!kIsTargetBuild) { 740 argv.push_back("--host"); 741 } 742 743 argv.push_back(boot_image_option); 744 argv.push_back(dex_file_option); 745 argv.push_back(oat_fd_option); 746 argv.push_back(oat_location_option); 747 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 748 for (size_t i = 0; i < compiler_options.size(); ++i) { 749 argv.push_back(compiler_options[i].c_str()); 750 } 751 752 return Exec(argv, error_msg); 753} 754 755const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 756 WriterMutexLock mu(Thread::Current(), dex_lock_); 757 if (kIsDebugBuild) { 758 for (size_t i = 0; i < oat_files_.size(); ++i) { 759 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 760 } 761 } 762 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 763 oat_files_.push_back(oat_file); 764 return oat_file; 765} 766 767OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 768 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 769 OatFile* oat_file = space->ReleaseOatFile(); 770 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 771 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 772 return *oat_file; 773} 774 775const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 776 const char* dex_location = dex_file.GetLocation().c_str(); 777 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 778 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 779} 780 781const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 782 const char* dex_location, 783 const uint32_t* dex_location_checksum) { 784 ReaderMutexLock mu(Thread::Current(), dex_lock_); 785 for (const OatFile* oat_file : oat_files_) { 786 DCHECK(oat_file != nullptr); 787 788 if (oat_location != nullptr) { 789 if (oat_file->GetLocation() != oat_location) { 790 continue; 791 } 792 } 793 794 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 795 dex_location_checksum, 796 false); 797 if (oat_dex_file != nullptr) { 798 return oat_dex_file; 799 } 800 } 801 return nullptr; 802} 803 804 805// Loads all multi dex files from the given oat file returning true on success. 806// 807// Parameters: 808// oat_file - the oat file to load from 809// dex_location - the dex location used to generate the oat file 810// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 811// generated - whether or not the oat_file existed before or was just (re)generated 812// error_msgs - any error messages will be appended here 813// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 814static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 815 const char* dex_location, 816 const uint32_t* dex_location_checksum, 817 bool generated, 818 std::vector<std::string>* error_msgs, 819 std::vector<const DexFile*>* dex_files) { 820 if (oat_file == nullptr) { 821 return false; 822 } 823 824 size_t old_size = dex_files->size(); // To rollback on error. 825 826 bool success = true; 827 for (size_t i = 0; success; ++i) { 828 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 829 const char* next_name = next_name_str.c_str(); 830 831 uint32_t next_location_checksum; 832 uint32_t* next_location_checksum_pointer = &next_location_checksum; 833 std::string error_msg; 834 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 835 // When i=0 the multidex name should be the same as the location name. We already have the 836 // checksum it so we don't need to recompute it. 837 if (dex_location_checksum == nullptr) { 838 next_location_checksum_pointer = nullptr; 839 } else { 840 next_location_checksum = *dex_location_checksum; 841 } 842 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 843 DCHECK_EQ(false, i == 0 && generated); 844 next_location_checksum_pointer = nullptr; 845 } 846 847 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 848 849 if (oat_dex_file == nullptr) { 850 if (i == 0 && generated) { 851 std::string error_msg; 852 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 853 " file'%s'", dex_location, next_location_checksum, 854 oat_file->GetLocation().c_str()); 855 error_msgs->push_back(error_msg); 856 } 857 break; // Not found, done. 858 } 859 860 // Checksum test. Test must succeed when generated. 861 success = !generated; 862 if (next_location_checksum_pointer != nullptr) { 863 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 864 } 865 866 if (success) { 867 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 868 if (dex_file == nullptr) { 869 success = false; 870 error_msgs->push_back(error_msg); 871 } else { 872 dex_files->push_back(dex_file); 873 } 874 } 875 876 // When we generated the file, we expect success, or something is terribly wrong. 877 CHECK_EQ(false, generated && !success) 878 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 879 << std::hex << " dex_location_checksum=" << next_location_checksum 880 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 881 } 882 883 if (dex_files->size() == old_size) { 884 success = false; // We did not even find classes.dex 885 } 886 887 if (success) { 888 return true; 889 } else { 890 // Free all the dex files we have loaded. 891 auto it = dex_files->begin() + old_size; 892 auto it_end = dex_files->end(); 893 for (; it != it_end; it++) { 894 delete *it; 895 } 896 dex_files->erase(dex_files->begin() + old_size, it_end); 897 898 return false; 899 } 900} 901 902// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 903// complicates the loading process, as we should not use an iterative loading process, because that 904// would register the oat file and dex files that come before the broken one. Instead, check all 905// multidex ahead of time. 906bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 907 std::vector<std::string>* error_msgs, 908 std::vector<const DexFile*>* dex_files) { 909 // 1) Check whether we have an open oat file. 910 // This requires a dex checksum, use the "primary" one. 911 uint32_t dex_location_checksum; 912 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 913 bool have_checksum = true; 914 std::string checksum_error_msg; 915 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 916 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 917 dex_location_checksum_pointer = nullptr; 918 have_checksum = false; 919 } 920 921 bool needs_registering = false; 922 923 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 924 dex_location_checksum_pointer); 925 std::unique_ptr<const OatFile> open_oat_file( 926 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 927 928 // 2) If we do not have an open one, maybe there's one on disk already. 929 930 // In case the oat file is not open, we play a locking game here so 931 // that if two different processes race to load and register or generate 932 // (or worse, one tries to open a partial generated file) we will be okay. 933 // This is actually common with apps that use DexClassLoader to work 934 // around the dex method reference limit and that have a background 935 // service running in a separate process. 936 ScopedFlock scoped_flock; 937 938 if (open_oat_file.get() == nullptr) { 939 if (oat_location != nullptr) { 940 // Can only do this if we have a checksum, else error. 941 if (!have_checksum) { 942 error_msgs->push_back(checksum_error_msg); 943 return false; 944 } 945 946 std::string error_msg; 947 948 // We are loading or creating one in the future. Time to set up the file lock. 949 if (!scoped_flock.Init(oat_location, &error_msg)) { 950 error_msgs->push_back(error_msg); 951 return false; 952 } 953 954 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 955 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 956 oat_location, &error_msg)); 957 958 if (open_oat_file.get() == nullptr) { 959 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 960 dex_location, oat_location, error_msg.c_str()); 961 VLOG(class_linker) << compound_msg; 962 error_msgs->push_back(compound_msg); 963 } 964 } else { 965 // TODO: What to lock here? 966 bool obsolete_file_cleanup_failed; 967 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 968 dex_location_checksum_pointer, 969 kRuntimeISA, error_msgs, 970 &obsolete_file_cleanup_failed)); 971 // There's no point in going forward and eventually try to regenerate the 972 // file if we couldn't remove the obsolete one. Mostly likely we will fail 973 // with the same error when trying to write the new file. 974 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 975 if (obsolete_file_cleanup_failed) { 976 return false; 977 } 978 } 979 needs_registering = true; 980 } 981 982 // 3) If we have an oat file, check all contained multidex files for our dex_location. 983 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 984 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 985 dex_location_checksum_pointer, 986 false, error_msgs, dex_files); 987 if (success) { 988 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 989 if (needs_registering) { 990 // We opened the oat file, so we must register it. 991 RegisterOatFile(oat_file); 992 } 993 // If the file isn't executable we failed patchoat but did manage to get the dex files. 994 return oat_file->IsExecutable(); 995 } else { 996 if (needs_registering) { 997 // We opened it, delete it. 998 open_oat_file.reset(); 999 } else { 1000 open_oat_file.release(); // Do not delete open oat files. 1001 } 1002 } 1003 1004 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 1005 1006 // Need a checksum, fail else. 1007 if (!have_checksum) { 1008 error_msgs->push_back(checksum_error_msg); 1009 return false; 1010 } 1011 1012 // Look in cache location if no oat_location is given. 1013 std::string cache_location; 1014 if (oat_location == nullptr) { 1015 // Use the dalvik cache. 1016 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1017 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 1018 oat_location = cache_location.c_str(); 1019 } 1020 1021 bool has_flock = true; 1022 // Definitely need to lock now. 1023 if (!scoped_flock.HasFile()) { 1024 std::string error_msg; 1025 if (!scoped_flock.Init(oat_location, &error_msg)) { 1026 error_msgs->push_back(error_msg); 1027 has_flock = false; 1028 } 1029 } 1030 1031 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1032 // Create the oat file. 1033 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1034 oat_location, error_msgs)); 1035 } 1036 1037 // Failed, bail. 1038 if (open_oat_file.get() == nullptr) { 1039 std::string error_msg; 1040 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1041 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1042 error_msgs->push_back(error_msg); 1043 return false; 1044 } 1045 1046 // Try to load again, but stronger checks. 1047 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1048 dex_location_checksum_pointer, 1049 true, error_msgs, dex_files); 1050 if (success) { 1051 RegisterOatFile(open_oat_file.release()); 1052 return true; 1053 } else { 1054 return false; 1055 } 1056} 1057 1058const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1059 uint32_t dex_location_checksum, 1060 const char* oat_location, 1061 std::string* error_msg) { 1062 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1063 !Runtime::Current()->IsCompiler(), 1064 error_msg)); 1065 if (oat_file.get() == nullptr) { 1066 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1067 error_msg->c_str()); 1068 return nullptr; 1069 } 1070 Runtime* runtime = Runtime::Current(); 1071 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1072 if (image_space != nullptr) { 1073 const ImageHeader& image_header = image_space->GetImageHeader(); 1074 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1075 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1076 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1077 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1078 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1079 actual_image_oat_checksum); 1080 return nullptr; 1081 } 1082 1083 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1084 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1085 if (expected_image_oat_offset != actual_image_oat_offset) { 1086 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1087 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1088 actual_image_oat_offset); 1089 return nullptr; 1090 } 1091 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1092 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1093 if (expected_patch_delta != actual_patch_delta) { 1094 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1095 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1096 return nullptr; 1097 } 1098 } 1099 1100 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1101 &dex_location_checksum); 1102 if (oat_dex_file == nullptr) { 1103 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1104 dex_location); 1105 return nullptr; 1106 } 1107 uint32_t expected_dex_checksum = dex_location_checksum; 1108 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1109 if (expected_dex_checksum != actual_dex_checksum) { 1110 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1111 "found 0x%x", oat_location, expected_dex_checksum, 1112 actual_dex_checksum); 1113 return nullptr; 1114 } 1115 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1116 if (dex_file.get() != nullptr) { 1117 return oat_file.release(); 1118 } else { 1119 return nullptr; 1120 } 1121} 1122 1123const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1124 int fd, const char* oat_location, 1125 std::vector<std::string>* error_msgs) { 1126 // Generate the output oat file for the dex file 1127 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1128 std::string error_msg; 1129 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1130 CHECK(!error_msg.empty()); 1131 error_msgs->push_back(error_msg); 1132 return nullptr; 1133 } 1134 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1135 !Runtime::Current()->IsCompiler(), 1136 &error_msg)); 1137 if (oat_file.get() == nullptr) { 1138 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1139 oat_location, error_msg.c_str()); 1140 error_msgs->push_back(compound_msg); 1141 return nullptr; 1142 } 1143 1144 return oat_file.release(); 1145} 1146 1147bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1148 const InstructionSet instruction_set) { 1149 Runtime* runtime = Runtime::Current(); 1150 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1151 if (image_space == nullptr) { 1152 return false; 1153 } 1154 uint32_t image_oat_checksum = 0; 1155 if (instruction_set == kRuntimeISA) { 1156 const ImageHeader& image_header = image_space->GetImageHeader(); 1157 image_oat_checksum = image_header.GetOatChecksum(); 1158 } else { 1159 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1160 image_space->GetImageLocation().c_str(), instruction_set)); 1161 image_oat_checksum = image_header->GetOatChecksum(); 1162 } 1163 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1164} 1165 1166bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1167 const InstructionSet instruction_set, 1168 std::string* error_msg) { 1169 Runtime* runtime = Runtime::Current(); 1170 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1171 if (image_space == nullptr) { 1172 *error_msg = "No image space for verification against"; 1173 return false; 1174 } 1175 1176 // If the requested instruction set is the same as the current runtime, 1177 // we can use the checksums directly. If it isn't, we'll have to read the 1178 // image header from the image for the right instruction set. 1179 uint32_t image_oat_checksum = 0; 1180 uintptr_t image_oat_data_begin = 0; 1181 int32_t image_patch_delta = 0; 1182 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1183 const ImageHeader& image_header = image_space->GetImageHeader(); 1184 image_oat_checksum = image_header.GetOatChecksum(); 1185 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1186 image_patch_delta = image_header.GetPatchDelta(); 1187 } else { 1188 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1189 image_space->GetImageLocation().c_str(), instruction_set)); 1190 image_oat_checksum = image_header->GetOatChecksum(); 1191 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1192 image_patch_delta = image_header->GetPatchDelta(); 1193 } 1194 const OatHeader& oat_header = oat_file->GetOatHeader(); 1195 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1196 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1197 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1198 if (!ret) { 1199 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1200 oat_file->GetLocation().c_str(), 1201 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1202 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1203 oat_file->GetOatHeader().GetImagePatchDelta(), 1204 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1205 } 1206 return ret; 1207} 1208 1209bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1210 const char* dex_location, 1211 uint32_t dex_location_checksum, 1212 const InstructionSet instruction_set, 1213 std::string* error_msg) { 1214 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1215 return false; 1216 } 1217 1218 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1219 &dex_location_checksum); 1220 if (oat_dex_file == nullptr) { 1221 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1222 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1223 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1224 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1225 oat_file->GetLocation().c_str(), 1226 oat_dex_file->GetDexFileLocation().c_str(), 1227 oat_dex_file->GetDexFileLocationChecksum()); 1228 } 1229 return false; 1230 } 1231 1232 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1233 return true; 1234} 1235 1236bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1237 const char* dex_location, 1238 const uint32_t* dex_location_checksum, 1239 std::string* error_msg) { 1240 CHECK(oat_file != nullptr); 1241 CHECK(dex_location != nullptr); 1242 std::unique_ptr<const DexFile> dex_file; 1243 if (dex_location_checksum == nullptr) { 1244 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1245 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1246 // directory. 1247 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1248 if (oat_dex_file == nullptr) { 1249 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1250 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1251 error_msg->c_str()); 1252 return false; 1253 } 1254 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1255 } else { 1256 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1257 kRuntimeISA, error_msg); 1258 if (!verified) { 1259 return false; 1260 } 1261 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1262 dex_location_checksum)->OpenDexFile(error_msg)); 1263 } 1264 return dex_file.get() != nullptr; 1265} 1266 1267const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1268 const char* dex_location, 1269 const uint32_t* dex_location_checksum, 1270 InstructionSet isa, 1271 std::vector<std::string>* error_msgs, 1272 bool* obsolete_file_cleanup_failed) { 1273 *obsolete_file_cleanup_failed = false; 1274 bool already_opened = false; 1275 std::string dex_location_str(dex_location); 1276 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1277 &already_opened, 1278 obsolete_file_cleanup_failed, 1279 error_msgs)); 1280 std::string error_msg; 1281 if (oat_file.get() == nullptr) { 1282 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1283 dex_location)); 1284 return nullptr; 1285 } else if (oat_file->IsExecutable() && 1286 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1287 dex_location_checksum, &error_msg)) { 1288 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1289 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1290 error_msg.c_str())); 1291 return nullptr; 1292 } else if (!oat_file->IsExecutable() && 1293 Runtime::Current()->GetHeap()->HasImageSpace() && 1294 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1295 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1296 "dex location '%s'. Image checksum incorrect.", 1297 oat_file->GetLocation().c_str(), dex_location)); 1298 return nullptr; 1299 } else { 1300 return oat_file.release(); 1301 } 1302} 1303 1304const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1305 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1306 for (size_t i = 0; i < oat_files_.size(); i++) { 1307 const OatFile* oat_file = oat_files_[i]; 1308 DCHECK(oat_file != nullptr); 1309 if (oat_file->GetLocation() == oat_location) { 1310 return oat_file; 1311 } 1312 } 1313 return nullptr; 1314} 1315 1316const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1317 InstructionSet isa, 1318 bool *already_opened, 1319 bool *obsolete_file_cleanup_failed, 1320 std::vector<std::string>* error_msgs) { 1321 // Find out if we've already opened the file 1322 const OatFile* ret = nullptr; 1323 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1324 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1325 if (ret != nullptr) { 1326 *already_opened = true; 1327 return ret; 1328 } 1329 1330 std::string dalvik_cache; 1331 bool have_android_data = false; 1332 bool have_dalvik_cache = false; 1333 bool is_global_cache = false; 1334 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1335 &have_android_data, &have_dalvik_cache, &is_global_cache); 1336 std::string cache_filename; 1337 if (have_dalvik_cache) { 1338 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1339 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1340 if (ret != nullptr) { 1341 *already_opened = true; 1342 return ret; 1343 } 1344 } else { 1345 // If we need to relocate we should just place odex back where it started. 1346 cache_filename = odex_filename; 1347 } 1348 1349 ret = nullptr; 1350 1351 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1352 // 1353 // Now we do the following: 1354 // 1) Try and open the odex version 1355 // 2) If present, checksum-verified & relocated correctly return it 1356 // 3) Close the odex version to free up its address space. 1357 // 4) Try and open the cache version 1358 // 5) If present, checksum-verified & relocated correctly return it 1359 // 6) Close the cache version to free up its address space. 1360 // 7) If we should relocate: 1361 // a) If we have opened and checksum-verified the odex version relocate it to 1362 // 'cache_filename' and return it 1363 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1364 // it. This should not happen often (I think only the run-test's will hit this case). 1365 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1366 // this point. 1367 // 9) Return nullptr 1368 1369 *already_opened = false; 1370 const Runtime* runtime = Runtime::Current(); 1371 CHECK(runtime != nullptr); 1372 bool executable = !runtime->IsCompiler(); 1373 1374 std::string odex_error_msg; 1375 bool should_patch_system = false; 1376 bool odex_checksum_verified = false; 1377 bool have_system_odex = false; 1378 { 1379 // There is a high probability that these both these oat files map similar/the same address 1380 // spaces so we must scope them like this so they each gets its turn. 1381 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1382 executable, &odex_error_msg)); 1383 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1384 &odex_checksum_verified, 1385 &odex_error_msg)) { 1386 return odex_oat_file.release(); 1387 } else { 1388 if (odex_checksum_verified) { 1389 // We can just relocate 1390 should_patch_system = true; 1391 odex_error_msg = "Image Patches are incorrect"; 1392 } 1393 if (odex_oat_file.get() != nullptr) { 1394 have_system_odex = true; 1395 } 1396 } 1397 } 1398 1399 std::string cache_error_msg; 1400 bool should_patch_cache = false; 1401 bool cache_checksum_verified = false; 1402 if (have_dalvik_cache) { 1403 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1404 executable, &cache_error_msg)); 1405 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1406 &cache_checksum_verified, 1407 &cache_error_msg)) { 1408 return cache_oat_file.release(); 1409 } else if (cache_checksum_verified) { 1410 // We can just relocate 1411 should_patch_cache = true; 1412 cache_error_msg = "Image Patches are incorrect"; 1413 } 1414 } else if (have_android_data) { 1415 // dalvik_cache does not exist but android data does. This means we should be able to create 1416 // it, so we should try. 1417 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1418 } 1419 1420 ret = nullptr; 1421 std::string error_msg; 1422 if (runtime->CanRelocate()) { 1423 // Run relocation 1424 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1425 if (space != nullptr) { 1426 const std::string& image_location = space->GetImageLocation(); 1427 if (odex_checksum_verified && should_patch_system) { 1428 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1429 } else if (cache_checksum_verified && should_patch_cache) { 1430 CHECK(have_dalvik_cache); 1431 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1432 } 1433 } else if (have_system_odex) { 1434 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1435 } 1436 } 1437 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1438 // implicitly: were able to fine where the cached version is but we were unable to use it, 1439 // either as a destination for relocation or to open a file. We should delete it if it is 1440 // there. 1441 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1442 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1443 "searching for dex file %s: %s", 1444 cache_filename.c_str(), dex_location.c_str(), 1445 strerror(errno)); 1446 error_msgs->push_back(rm_error_msg); 1447 VLOG(class_linker) << rm_error_msg; 1448 // Let the caller know that we couldn't remove the obsolete file. 1449 // This is a good indication that further writes may fail as well. 1450 *obsolete_file_cleanup_failed = true; 1451 } 1452 } 1453 if (ret == nullptr) { 1454 VLOG(class_linker) << error_msg; 1455 error_msgs->push_back(error_msg); 1456 std::string relocation_msg; 1457 if (runtime->CanRelocate()) { 1458 relocation_msg = StringPrintf(" and relocation failed"); 1459 } 1460 if (have_dalvik_cache && cache_checksum_verified) { 1461 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1462 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1463 cache_filename.c_str(), cache_error_msg.c_str(), 1464 relocation_msg.c_str()); 1465 } else { 1466 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1467 "dalvik_cache availible)%s.", odex_filename.c_str(), 1468 odex_error_msg.c_str(), relocation_msg.c_str()); 1469 } 1470 VLOG(class_linker) << error_msg; 1471 error_msgs->push_back(error_msg); 1472 } 1473 return ret; 1474} 1475 1476const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1477 InstructionSet isa, 1478 std::string* error_msg) { 1479 // We open it non-executable 1480 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1481 if (output.get() == nullptr) { 1482 return nullptr; 1483 } 1484 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1485 VerifyOatImageChecksum(output.get(), isa)) { 1486 return output.release(); 1487 } else { 1488 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1489 oat_path.c_str()); 1490 return nullptr; 1491 } 1492} 1493 1494const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1495 const std::string& output_oat, 1496 const std::string& image_location, 1497 InstructionSet isa, 1498 std::string* error_msg) { 1499 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1500 // We don't have an image space so there is no point in trying to patchoat. 1501 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1502 << "running without an image. Attempting to use oat file for interpretation."; 1503 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1504 } 1505 if (!Runtime::Current()->IsDex2OatEnabled()) { 1506 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1507 // input_oat but make sure we only do interpretation on it's dex files. 1508 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1509 << "disabled. Attempting to use oat file for interpretation"; 1510 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1511 } 1512 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1513 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1514 1515 std::string isa_arg("--instruction-set="); 1516 isa_arg += GetInstructionSetString(isa); 1517 std::string input_oat_filename_arg("--input-oat-file="); 1518 input_oat_filename_arg += input_oat; 1519 std::string output_oat_filename_arg("--output-oat-file="); 1520 output_oat_filename_arg += output_oat; 1521 std::string patched_image_arg("--patched-image-location="); 1522 patched_image_arg += image_location; 1523 1524 std::vector<std::string> argv; 1525 argv.push_back(patchoat); 1526 argv.push_back(isa_arg); 1527 argv.push_back(input_oat_filename_arg); 1528 argv.push_back(output_oat_filename_arg); 1529 argv.push_back(patched_image_arg); 1530 1531 std::string command_line(Join(argv, ' ')); 1532 LOG(INFO) << "Relocate Oat File: " << command_line; 1533 bool success = Exec(argv, error_msg); 1534 if (success) { 1535 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1536 !Runtime::Current()->IsCompiler(), error_msg)); 1537 bool checksum_verified = false; 1538 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1539 return output.release(); 1540 } else if (output.get() != nullptr) { 1541 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1542 "but output file '%s' failed verifcation: %s", 1543 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1544 } else { 1545 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1546 "but was unable to open output file '%s': %s", 1547 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1548 } 1549 } else if (!Runtime::Current()->IsCompiler()) { 1550 // patchoat failed which means we probably don't have enough room to place the output oat file, 1551 // instead of failing we should just run the interpreter from the dex files in the input oat. 1552 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1553 << "for interpretation. patchoat failure was: " << *error_msg; 1554 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1555 } else { 1556 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1557 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1558 error_msg->c_str()); 1559 } 1560 return nullptr; 1561} 1562 1563int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1564 Runtime* runtime = Runtime::Current(); 1565 int32_t real_patch_delta; 1566 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1567 CHECK(image_space != nullptr); 1568 if (isa == Runtime::Current()->GetInstructionSet()) { 1569 const ImageHeader& image_header = image_space->GetImageHeader(); 1570 real_patch_delta = image_header.GetPatchDelta(); 1571 } else { 1572 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1573 image_space->GetImageLocation().c_str(), isa)); 1574 real_patch_delta = image_header->GetPatchDelta(); 1575 } 1576 const OatHeader& oat_header = oat_file->GetOatHeader(); 1577 return real_patch_delta - oat_header.GetImagePatchDelta(); 1578} 1579 1580bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1581 bool* checksum_verified, 1582 std::string* error_msg) { 1583 Runtime* runtime = Runtime::Current(); 1584 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1585 if (image_space == nullptr) { 1586 *error_msg = "No image space present"; 1587 return false; 1588 } 1589 uint32_t real_image_checksum; 1590 void* real_image_oat_offset; 1591 int32_t real_patch_delta; 1592 if (isa == runtime->GetInstructionSet()) { 1593 const ImageHeader& image_header = image_space->GetImageHeader(); 1594 real_image_checksum = image_header.GetOatChecksum(); 1595 real_image_oat_offset = image_header.GetOatDataBegin(); 1596 real_patch_delta = image_header.GetPatchDelta(); 1597 } else { 1598 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1599 image_space->GetImageLocation().c_str(), isa)); 1600 real_image_checksum = image_header->GetOatChecksum(); 1601 real_image_oat_offset = image_header->GetOatDataBegin(); 1602 real_patch_delta = image_header->GetPatchDelta(); 1603 } 1604 1605 const OatHeader& oat_header = oat_file->GetOatHeader(); 1606 std::string compound_msg; 1607 1608 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1609 *checksum_verified = oat_image_checksum == real_image_checksum; 1610 if (!*checksum_verified) { 1611 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1612 real_image_checksum, oat_image_checksum); 1613 } 1614 1615 void* oat_image_oat_offset = 1616 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1617 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1618 if (!offset_verified) { 1619 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1620 real_image_oat_offset, oat_image_oat_offset); 1621 } 1622 1623 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1624 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1625 if (!patch_delta_verified) { 1626 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1627 real_patch_delta, oat_patch_delta); 1628 } 1629 1630 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1631 if (!ret) { 1632 *error_msg = "Oat file failed to verify:" + compound_msg; 1633 } 1634 return ret; 1635} 1636 1637const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1638 std::string* error_msg) { 1639 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1640 if (oat_file != nullptr) { 1641 return oat_file; 1642 } 1643 1644 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1645 error_msg); 1646} 1647 1648static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1649 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1650 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1651 1652 DCHECK(obj != nullptr); 1653 DCHECK(class_linker != nullptr); 1654 1655 if (obj->IsArtMethod()) { 1656 mirror::ArtMethod* method = obj->AsArtMethod(); 1657 if (!method->IsNative()) { 1658 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1659 if (method != Runtime::Current()->GetResolutionMethod()) { 1660 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1661 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1662 } 1663 } 1664 } 1665} 1666 1667void ClassLinker::InitFromImage() { 1668 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1669 CHECK(!init_done_); 1670 1671 Thread* self = Thread::Current(); 1672 gc::Heap* heap = Runtime::Current()->GetHeap(); 1673 gc::space::ImageSpace* space = heap->GetImageSpace(); 1674 dex_cache_image_class_lookup_required_ = true; 1675 CHECK(space != nullptr); 1676 OatFile& oat_file = GetImageOatFile(space); 1677 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1678 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1679 const char* image_file_location = oat_file.GetOatHeader(). 1680 GetStoreValueByKey(OatHeader::kImageLocationKey); 1681 CHECK(image_file_location == nullptr || *image_file_location == 0); 1682 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1683 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1684 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1685 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1686 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1687 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1688 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1689 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1690 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1691 1692 StackHandleScope<1> hs(self); 1693 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1694 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1695 AsObjectArray<mirror::Class>())); 1696 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1697 1698 // Special case of setting up the String class early so that we can test arbitrary objects 1699 // as being Strings or not 1700 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1701 1702 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1703 static_cast<uint32_t>(dex_caches->GetLength())); 1704 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1705 StackHandleScope<1> hs(self); 1706 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1707 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1708 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1709 nullptr); 1710 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1711 std::string error_msg; 1712 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1713 if (dex_file == nullptr) { 1714 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1715 << " from within oat file " << oat_file.GetLocation() 1716 << " error '" << error_msg << "'"; 1717 } 1718 1719 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1720 1721 AppendToBootClassPath(*dex_file, dex_cache); 1722 } 1723 1724 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1725 // bitmap walk. 1726 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1727 1728 // Set entry point to interpreter if in InterpretOnly mode. 1729 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1730 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1731 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1732 } 1733 1734 // reinit class_roots_ 1735 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1736 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1737 1738 // reinit array_iftable_ from any array class instance, they should be == 1739 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1740 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1741 // String class root was set above 1742 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1743 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1744 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1745 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1746 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1747 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1748 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1749 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1750 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1751 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1752 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1753 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1754 1755 FinishInit(self); 1756 1757 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1758} 1759 1760void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1761 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1762 if ((flags & kVisitRootFlagAllRoots) != 0) { 1763 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1764 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1765 } 1766 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1767 for (auto& pair : new_class_roots_) { 1768 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1769 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1770 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1771 if (UNLIKELY(new_ref != old_ref)) { 1772 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1773 // corresponding object. This is slow, but luckily for us, this may only happen with a 1774 // concurrent moving GC. 1775 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1776 it != end && it->first == pair.first; ++it) { 1777 // If the class stored matches the old class, update it to the new value. 1778 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1779 it->second = GcRoot<mirror::Class>(new_ref); 1780 } 1781 } 1782 } 1783 } 1784 } 1785 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1786 new_class_roots_.clear(); 1787 } 1788 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1789 log_new_class_table_roots_ = true; 1790 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1791 log_new_class_table_roots_ = false; 1792 } 1793 // We deliberately ignore the class roots in the image since we 1794 // handle image roots by using the MS/CMS rescanning of dirty cards. 1795} 1796 1797// Keep in sync with InitCallback. Anything we visit, we need to 1798// reinit references to when reinitializing a ClassLinker from a 1799// mapped image. 1800void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1801 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1802 Thread* self = Thread::Current(); 1803 { 1804 ReaderMutexLock mu(self, dex_lock_); 1805 if ((flags & kVisitRootFlagAllRoots) != 0) { 1806 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1807 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1808 } 1809 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1810 for (size_t index : new_dex_cache_roots_) { 1811 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1812 } 1813 } 1814 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1815 new_dex_cache_roots_.clear(); 1816 } 1817 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1818 log_new_dex_caches_roots_ = true; 1819 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1820 log_new_dex_caches_roots_ = false; 1821 } 1822 } 1823 VisitClassRoots(callback, arg, flags); 1824 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1825 DCHECK(!array_iftable_.IsNull()); 1826 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1827 if (!find_array_class_cache_[i].IsNull()) { 1828 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1829 } 1830 } 1831} 1832 1833void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1834 if (dex_cache_image_class_lookup_required_) { 1835 MoveImageClassesToClassTable(); 1836 } 1837 // TODO: why isn't this a ReaderMutexLock? 1838 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1839 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1840 mirror::Class* c = it.second.Read(); 1841 if (!visitor(c, arg)) { 1842 return; 1843 } 1844 } 1845} 1846 1847static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1848 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1849 classes->insert(c); 1850 return true; 1851} 1852 1853struct GetClassesVisitorArrayArg { 1854 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1855 int32_t index; 1856 bool success; 1857}; 1858 1859static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1860 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1861 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1862 if (arg->index < (*arg->classes)->GetLength()) { 1863 (*arg->classes)->Set(arg->index, c); 1864 arg->index++; 1865 return true; 1866 } else { 1867 arg->success = false; 1868 return false; 1869 } 1870} 1871 1872void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1873 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1874 // is avoiding duplicates. 1875 if (!kMovingClasses) { 1876 std::set<mirror::Class*> classes; 1877 VisitClasses(GetClassesVisitorSet, &classes); 1878 for (mirror::Class* klass : classes) { 1879 if (!visitor(klass, arg)) { 1880 return; 1881 } 1882 } 1883 } else { 1884 Thread* self = Thread::Current(); 1885 StackHandleScope<1> hs(self); 1886 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1887 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1888 GetClassesVisitorArrayArg local_arg; 1889 local_arg.classes = &classes; 1890 local_arg.success = false; 1891 // We size the array assuming classes won't be added to the class table during the visit. 1892 // If this assumption fails we iterate again. 1893 while (!local_arg.success) { 1894 size_t class_table_size; 1895 { 1896 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1897 class_table_size = class_table_.size(); 1898 } 1899 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1900 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1901 classes.Assign( 1902 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1903 CHECK(classes.Get() != nullptr); // OOME. 1904 local_arg.index = 0; 1905 local_arg.success = true; 1906 VisitClasses(GetClassesVisitorArray, &local_arg); 1907 } 1908 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1909 // If the class table shrank during creation of the clases array we expect null elements. If 1910 // the class table grew then the loop repeats. If classes are created after the loop has 1911 // finished then we don't visit. 1912 mirror::Class* klass = classes->Get(i); 1913 if (klass != nullptr && !visitor(klass, arg)) { 1914 return; 1915 } 1916 } 1917 } 1918} 1919 1920ClassLinker::~ClassLinker() { 1921 mirror::Class::ResetClass(); 1922 mirror::String::ResetClass(); 1923 mirror::Reference::ResetClass(); 1924 mirror::ArtField::ResetClass(); 1925 mirror::ArtMethod::ResetClass(); 1926 mirror::BooleanArray::ResetArrayClass(); 1927 mirror::ByteArray::ResetArrayClass(); 1928 mirror::CharArray::ResetArrayClass(); 1929 mirror::DoubleArray::ResetArrayClass(); 1930 mirror::FloatArray::ResetArrayClass(); 1931 mirror::IntArray::ResetArrayClass(); 1932 mirror::LongArray::ResetArrayClass(); 1933 mirror::ShortArray::ResetArrayClass(); 1934 mirror::Throwable::ResetClass(); 1935 mirror::StackTraceElement::ResetClass(); 1936 STLDeleteElements(&boot_class_path_); 1937 STLDeleteElements(&oat_files_); 1938} 1939 1940mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1941 gc::Heap* heap = Runtime::Current()->GetHeap(); 1942 StackHandleScope<16> hs(self); 1943 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1944 Handle<mirror::DexCache> dex_cache( 1945 hs.NewHandle(down_cast<mirror::DexCache*>( 1946 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1947 VoidFunctor())))); 1948 if (dex_cache.Get() == nullptr) { 1949 return nullptr; 1950 } 1951 Handle<mirror::String> 1952 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1953 if (location.Get() == nullptr) { 1954 return nullptr; 1955 } 1956 Handle<mirror::ObjectArray<mirror::String>> 1957 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1958 if (strings.Get() == nullptr) { 1959 return nullptr; 1960 } 1961 Handle<mirror::ObjectArray<mirror::Class>> 1962 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1963 if (types.Get() == nullptr) { 1964 return nullptr; 1965 } 1966 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1967 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1968 if (methods.Get() == nullptr) { 1969 return nullptr; 1970 } 1971 Handle<mirror::ObjectArray<mirror::ArtField>> 1972 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1973 if (fields.Get() == nullptr) { 1974 return nullptr; 1975 } 1976 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1977 fields.Get()); 1978 return dex_cache.Get(); 1979} 1980 1981mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1982 uint32_t class_size) { 1983 DCHECK_GE(class_size, sizeof(mirror::Class)); 1984 gc::Heap* heap = Runtime::Current()->GetHeap(); 1985 mirror::Class::InitializeClassVisitor visitor(class_size); 1986 mirror::Object* k = kMovingClasses ? 1987 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1988 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1989 if (UNLIKELY(k == nullptr)) { 1990 CHECK(self->IsExceptionPending()); // OOME. 1991 return nullptr; 1992 } 1993 return k->AsClass(); 1994} 1995 1996mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1997 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1998} 1999 2000mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 2001 return down_cast<mirror::ArtField*>( 2002 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 2003} 2004 2005mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 2006 return down_cast<mirror::ArtMethod*>( 2007 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 2008} 2009 2010mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 2011 Thread* self, size_t length) { 2012 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 2013 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 2014} 2015 2016mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 2017 mirror::Class* klass) { 2018 DCHECK(klass != nullptr); 2019 2020 // For temporary classes we must wait for them to be retired. 2021 if (init_done_ && klass->IsTemp()) { 2022 CHECK(!klass->IsResolved()); 2023 if (klass->IsErroneous()) { 2024 ThrowEarlierClassFailure(klass); 2025 return nullptr; 2026 } 2027 StackHandleScope<1> hs(self); 2028 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 2029 ObjectLock<mirror::Class> lock(self, h_class); 2030 // Loop and wait for the resolving thread to retire this class. 2031 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2032 lock.WaitIgnoringInterrupts(); 2033 } 2034 if (h_class->IsErroneous()) { 2035 ThrowEarlierClassFailure(h_class.Get()); 2036 return nullptr; 2037 } 2038 CHECK(h_class->IsRetired()); 2039 // Get the updated class from class table. 2040 klass = LookupClass(self, descriptor, h_class.Get()->GetClassLoader()); 2041 } 2042 2043 // Wait for the class if it has not already been linked. 2044 if (!klass->IsResolved() && !klass->IsErroneous()) { 2045 StackHandleScope<1> hs(self); 2046 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2047 ObjectLock<mirror::Class> lock(self, h_class); 2048 // Check for circular dependencies between classes. 2049 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2050 ThrowClassCircularityError(h_class.Get()); 2051 h_class->SetStatus(mirror::Class::kStatusError, self); 2052 return nullptr; 2053 } 2054 // Wait for the pending initialization to complete. 2055 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2056 lock.WaitIgnoringInterrupts(); 2057 } 2058 } 2059 2060 if (klass->IsErroneous()) { 2061 ThrowEarlierClassFailure(klass); 2062 return nullptr; 2063 } 2064 // Return the loaded class. No exceptions should be pending. 2065 CHECK(klass->IsResolved()) << PrettyClass(klass); 2066 self->AssertNoPendingException(); 2067 return klass; 2068} 2069 2070typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2071 2072// Search a collection of DexFiles for a descriptor 2073ClassPathEntry FindInClassPath(const char* descriptor, 2074 const std::vector<const DexFile*>& class_path) { 2075 for (size_t i = 0; i != class_path.size(); ++i) { 2076 const DexFile* dex_file = class_path[i]; 2077 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2078 if (dex_class_def != nullptr) { 2079 return ClassPathEntry(dex_file, dex_class_def); 2080 } 2081 } 2082 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2083 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2084 static_cast<const DexFile::ClassDef*>(nullptr)); 2085} 2086 2087mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2088 Thread* self, const char* descriptor, 2089 Handle<mirror::ClassLoader> class_loader) { 2090 if (class_loader->GetClass() != 2091 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2092 class_loader->GetParent()->GetClass() != 2093 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2094 return nullptr; 2095 } 2096 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2097 // Check if this would be found in the parent boot class loader. 2098 if (pair.second != nullptr) { 2099 mirror::Class* klass = LookupClass(self, descriptor, nullptr); 2100 if (klass != nullptr) { 2101 return EnsureResolved(self, descriptor, klass); 2102 } 2103 klass = DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2104 *pair.second); 2105 if (klass != nullptr) { 2106 return klass; 2107 } 2108 CHECK(self->IsExceptionPending()) << descriptor; 2109 self->ClearException(); 2110 } else { 2111 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2112 StackHandleScope<3> hs(self); 2113 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2114 // We need to get the DexPathList and loop through it. 2115 Handle<mirror::ArtField> cookie_field = 2116 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2117 Handle<mirror::ArtField> dex_file_field = 2118 hs.NewHandle( 2119 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2120 mirror::Object* dex_path_list = 2121 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2122 GetObject(class_loader.Get()); 2123 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2124 cookie_field.Get() != nullptr) { 2125 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2126 mirror::Object* dex_elements_obj = 2127 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2128 GetObject(dex_path_list); 2129 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2130 // at the mCookie which is a DexFile vector. 2131 if (dex_elements_obj != nullptr) { 2132 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2133 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2134 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2135 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2136 if (element == nullptr) { 2137 // Should never happen, fall back to java code to throw a NPE. 2138 break; 2139 } 2140 mirror::Object* dex_file = dex_file_field->GetObject(element); 2141 if (dex_file != nullptr) { 2142 const uint64_t cookie = cookie_field->GetLong(dex_file); 2143 auto* dex_files = 2144 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2145 if (dex_files == nullptr) { 2146 // This should never happen so log a warning. 2147 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2148 break; 2149 } 2150 for (const DexFile* dex_file : *dex_files) { 2151 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2152 if (dex_class_def != nullptr) { 2153 RegisterDexFile(*dex_file); 2154 mirror::Class* klass = 2155 DefineClass(self, descriptor, class_loader, *dex_file, *dex_class_def); 2156 if (klass == nullptr) { 2157 CHECK(self->IsExceptionPending()) << descriptor; 2158 self->ClearException(); 2159 return nullptr; 2160 } 2161 return klass; 2162 } 2163 } 2164 } 2165 } 2166 } 2167 } 2168 } 2169 return nullptr; 2170} 2171 2172mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2173 Handle<mirror::ClassLoader> class_loader) { 2174 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2175 DCHECK(self != nullptr); 2176 self->AssertNoPendingException(); 2177 if (descriptor[1] == '\0') { 2178 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2179 // for primitive classes that aren't backed by dex files. 2180 return FindPrimitiveClass(descriptor[0]); 2181 } 2182 // Find the class in the loaded classes table. 2183 mirror::Class* klass = LookupClass(self, descriptor, class_loader.Get()); 2184 if (klass != nullptr) { 2185 return EnsureResolved(self, descriptor, klass); 2186 } 2187 // Class is not yet loaded. 2188 if (descriptor[0] == '[') { 2189 return CreateArrayClass(self, descriptor, class_loader); 2190 } else if (class_loader.Get() == nullptr) { 2191 // The boot class loader, search the boot class path. 2192 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2193 if (pair.second != nullptr) { 2194 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2195 *pair.second); 2196 } else { 2197 // The boot class loader is searched ahead of the application class loader, failures are 2198 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2199 // trigger the chaining with a proper stack trace. 2200 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2201 self->SetException(ThrowLocation(), pre_allocated); 2202 return nullptr; 2203 } 2204 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2205 // First try with the bootstrap class loader. 2206 if (class_loader.Get() != nullptr) { 2207 klass = LookupClass(self, descriptor, nullptr); 2208 if (klass != nullptr) { 2209 return EnsureResolved(self, descriptor, klass); 2210 } 2211 } 2212 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2213 // a NoClassDefFoundError being allocated. 2214 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2215 if (pair.second != nullptr) { 2216 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2217 *pair.second); 2218 } 2219 // Next try the compile time class path. 2220 const std::vector<const DexFile*>* class_path; 2221 { 2222 ScopedObjectAccessUnchecked soa(self); 2223 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2224 soa.AddLocalReference<jobject>(class_loader.Get())); 2225 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2226 } 2227 pair = FindInClassPath(descriptor, *class_path); 2228 if (pair.second != nullptr) { 2229 return DefineClass(self, descriptor, class_loader, *pair.first, *pair.second); 2230 } else { 2231 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2232 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2233 self->SetException(ThrowLocation(), pre_allocated); 2234 return nullptr; 2235 } 2236 } else { 2237 ScopedObjectAccessUnchecked soa(self); 2238 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2239 if (klass != nullptr) { 2240 return klass; 2241 } 2242 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2243 soa.AddLocalReference<jobject>(class_loader.Get())); 2244 std::string class_name_string(DescriptorToDot(descriptor)); 2245 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2246 { 2247 ScopedThreadStateChange tsc(self, kNative); 2248 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2249 soa.Env()->NewStringUTF(class_name_string.c_str())); 2250 if (class_name_object.get() == nullptr) { 2251 DCHECK(self->IsExceptionPending()); // OOME. 2252 return nullptr; 2253 } 2254 CHECK(class_loader_object.get() != nullptr); 2255 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2256 WellKnownClasses::java_lang_ClassLoader_loadClass, 2257 class_name_object.get())); 2258 } 2259 if (self->IsExceptionPending()) { 2260 // If the ClassLoader threw, pass that exception up. 2261 return nullptr; 2262 } else if (result.get() == nullptr) { 2263 // broken loader - throw NPE to be compatible with Dalvik 2264 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2265 class_name_string.c_str()).c_str()); 2266 return nullptr; 2267 } else { 2268 // success, return mirror::Class* 2269 return soa.Decode<mirror::Class*>(result.get()); 2270 } 2271 } 2272 2273 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2274 return nullptr; 2275} 2276 2277mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, 2278 Handle<mirror::ClassLoader> class_loader, 2279 const DexFile& dex_file, 2280 const DexFile::ClassDef& dex_class_def) { 2281 StackHandleScope<3> hs(self); 2282 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2283 bool should_allocate = false; 2284 2285 // Load the class from the dex file. 2286 if (UNLIKELY(!init_done_)) { 2287 // finish up init of hand crafted class_roots_ 2288 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2289 klass.Assign(GetClassRoot(kJavaLangObject)); 2290 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2291 klass.Assign(GetClassRoot(kJavaLangClass)); 2292 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2293 klass.Assign(GetClassRoot(kJavaLangString)); 2294 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2295 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2296 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2297 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2298 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2299 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2300 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2301 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2302 } else { 2303 should_allocate = true; 2304 } 2305 } else { 2306 should_allocate = true; 2307 } 2308 2309 if (should_allocate) { 2310 // Allocate a class with the status of not ready. 2311 // Interface object should get the right size here. Regular class will 2312 // figure out the right size later and be replaced with one of the right 2313 // size when the class becomes resolved. 2314 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2315 } 2316 if (UNLIKELY(klass.Get() == nullptr)) { 2317 CHECK(self->IsExceptionPending()); // Expect an OOME. 2318 return nullptr; 2319 } 2320 klass->SetDexCache(FindDexCache(dex_file)); 2321 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2322 ObjectLock<mirror::Class> lock(self, klass); 2323 if (self->IsExceptionPending()) { 2324 // An exception occured during load, set status to erroneous while holding klass' lock in case 2325 // notification is necessary. 2326 if (!klass->IsErroneous()) { 2327 klass->SetStatus(mirror::Class::kStatusError, self); 2328 } 2329 return nullptr; 2330 } 2331 klass->SetClinitThreadId(self->GetTid()); 2332 2333 // Add the newly loaded class to the loaded classes table. 2334 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2335 if (existing != nullptr) { 2336 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2337 // this thread to block. 2338 return EnsureResolved(self, descriptor, existing); 2339 } 2340 2341 // Finish loading (if necessary) by finding parents 2342 CHECK(!klass->IsLoaded()); 2343 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2344 // Loading failed. 2345 if (!klass->IsErroneous()) { 2346 klass->SetStatus(mirror::Class::kStatusError, self); 2347 } 2348 return nullptr; 2349 } 2350 CHECK(klass->IsLoaded()); 2351 // Link the class (if necessary) 2352 CHECK(!klass->IsResolved()); 2353 // TODO: Use fast jobjects? 2354 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2355 2356 mirror::Class* new_class = nullptr; 2357 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2358 // Linking failed. 2359 if (!klass->IsErroneous()) { 2360 klass->SetStatus(mirror::Class::kStatusError, self); 2361 } 2362 return nullptr; 2363 } 2364 self->AssertNoPendingException(); 2365 CHECK(new_class != nullptr) << descriptor; 2366 CHECK(new_class->IsResolved()) << descriptor; 2367 2368 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2369 2370 /* 2371 * We send CLASS_PREPARE events to the debugger from here. The 2372 * definition of "preparation" is creating the static fields for a 2373 * class and initializing them to the standard default values, but not 2374 * executing any code (that comes later, during "initialization"). 2375 * 2376 * We did the static preparation in LinkClass. 2377 * 2378 * The class has been prepared and resolved but possibly not yet verified 2379 * at this point. 2380 */ 2381 Dbg::PostClassPrepare(new_class_h.Get()); 2382 2383 return new_class_h.Get(); 2384} 2385 2386uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2387 const DexFile::ClassDef& dex_class_def) { 2388 const byte* class_data = dex_file.GetClassData(dex_class_def); 2389 size_t num_ref = 0; 2390 size_t num_8 = 0; 2391 size_t num_16 = 0; 2392 size_t num_32 = 0; 2393 size_t num_64 = 0; 2394 if (class_data != nullptr) { 2395 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2396 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2397 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2398 char c = descriptor[0]; 2399 switch (c) { 2400 case 'L': 2401 case '[': 2402 num_ref++; 2403 break; 2404 case 'J': 2405 case 'D': 2406 num_64++; 2407 break; 2408 case 'I': 2409 case 'F': 2410 num_32++; 2411 break; 2412 case 'S': 2413 case 'C': 2414 num_16++; 2415 break; 2416 case 'B': 2417 case 'Z': 2418 num_8++; 2419 break; 2420 default: 2421 LOG(FATAL) << "Unknown descriptor: " << c; 2422 } 2423 } 2424 } 2425 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2426} 2427 2428OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2429 bool* found) { 2430 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2431 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2432 if (oat_dex_file == nullptr) { 2433 *found = false; 2434 return OatFile::OatClass::Invalid(); 2435 } 2436 *found = true; 2437 return oat_dex_file->GetOatClass(class_def_idx); 2438} 2439 2440static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2441 uint32_t method_idx) { 2442 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2443 const byte* class_data = dex_file.GetClassData(class_def); 2444 CHECK(class_data != nullptr); 2445 ClassDataItemIterator it(dex_file, class_data); 2446 // Skip fields 2447 while (it.HasNextStaticField()) { 2448 it.Next(); 2449 } 2450 while (it.HasNextInstanceField()) { 2451 it.Next(); 2452 } 2453 // Process methods 2454 size_t class_def_method_index = 0; 2455 while (it.HasNextDirectMethod()) { 2456 if (it.GetMemberIndex() == method_idx) { 2457 return class_def_method_index; 2458 } 2459 class_def_method_index++; 2460 it.Next(); 2461 } 2462 while (it.HasNextVirtualMethod()) { 2463 if (it.GetMemberIndex() == method_idx) { 2464 return class_def_method_index; 2465 } 2466 class_def_method_index++; 2467 it.Next(); 2468 } 2469 DCHECK(!it.HasNext()); 2470 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2471 return 0; 2472} 2473 2474const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2475 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2476 // method for direct methods (or virtual methods made direct). 2477 mirror::Class* declaring_class = method->GetDeclaringClass(); 2478 size_t oat_method_index; 2479 if (method->IsStatic() || method->IsDirect()) { 2480 // Simple case where the oat method index was stashed at load time. 2481 oat_method_index = method->GetMethodIndex(); 2482 } else { 2483 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2484 // by search for its position in the declared virtual methods. 2485 oat_method_index = declaring_class->NumDirectMethods(); 2486 size_t end = declaring_class->NumVirtualMethods(); 2487 bool found = false; 2488 for (size_t i = 0; i < end; i++) { 2489 // Check method index instead of identity in case of duplicate method definitions. 2490 if (method->GetDexMethodIndex() == 2491 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2492 found = true; 2493 break; 2494 } 2495 oat_method_index++; 2496 } 2497 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2498 } 2499 DCHECK_EQ(oat_method_index, 2500 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2501 method->GetDeclaringClass()->GetDexClassDefIndex(), 2502 method->GetDexMethodIndex())); 2503 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2504 declaring_class->GetDexClassDefIndex(), 2505 found); 2506 if (!found) { 2507 return OatFile::OatMethod::Invalid(); 2508 } 2509 *found = true; 2510 return oat_class.GetOatMethod(oat_method_index); 2511} 2512 2513// Special case to get oat code without overwriting a trampoline. 2514const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2515 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2516 if (method->IsProxyMethod()) { 2517 return GetQuickProxyInvokeHandler(); 2518 } 2519 bool found; 2520 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2521 const void* result = nullptr; 2522 if (found) { 2523 result = oat_method.GetQuickCode(); 2524 } 2525 2526 if (result == nullptr) { 2527 if (method->IsNative()) { 2528 // No code and native? Use generic trampoline. 2529 result = GetQuickGenericJniTrampoline(); 2530 } else if (method->IsPortableCompiled()) { 2531 // No code? Do we expect portable code? 2532 result = GetQuickToPortableBridge(); 2533 } else { 2534 // No code? You must mean to go into the interpreter. 2535 result = GetQuickToInterpreterBridge(); 2536 } 2537 } 2538 return result; 2539} 2540 2541const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2542 bool* have_portable_code) { 2543 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2544 *have_portable_code = false; 2545 if (method->IsProxyMethod()) { 2546 return GetPortableProxyInvokeHandler(); 2547 } 2548 bool found; 2549 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2550 const void* result = nullptr; 2551 const void* quick_code = nullptr; 2552 if (found) { 2553 result = oat_method.GetPortableCode(); 2554 quick_code = oat_method.GetQuickCode(); 2555 } 2556 2557 if (result == nullptr) { 2558 if (quick_code == nullptr) { 2559 // No code? You must mean to go into the interpreter. 2560 result = GetPortableToInterpreterBridge(); 2561 } else { 2562 // No code? But there's quick code, so use a bridge. 2563 result = GetPortableToQuickBridge(); 2564 } 2565 } else { 2566 *have_portable_code = true; 2567 } 2568 return result; 2569} 2570 2571const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2572 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2573 return nullptr; 2574 } 2575 bool found; 2576 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2577 return found ? oat_method.GetQuickCode() : nullptr; 2578} 2579 2580const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2581 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2582 return nullptr; 2583 } 2584 bool found; 2585 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2586 return found ? oat_method.GetPortableCode() : nullptr; 2587} 2588 2589const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2590 uint32_t method_idx) { 2591 bool found; 2592 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2593 if (!found) { 2594 return nullptr; 2595 } 2596 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2597 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2598} 2599 2600const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2601 uint32_t method_idx) { 2602 bool found; 2603 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2604 if (!found) { 2605 return nullptr; 2606 } 2607 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2608 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2609} 2610 2611// Returns true if the method must run with interpreter, false otherwise. 2612static bool NeedsInterpreter( 2613 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2614 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2615 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2616 // No code: need interpreter. 2617 // May return true for native code, in the case of generic JNI 2618 // DCHECK(!method->IsNative()); 2619 return true; 2620 } 2621#ifdef ART_SEA_IR_MODE 2622 ScopedObjectAccess soa(Thread::Current()); 2623 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2624 LOG(INFO) << "Found " << PrettyMethod(method); 2625 return false; 2626 } 2627#endif 2628 // If interpreter mode is enabled, every method (except native and proxy) must 2629 // be run with interpreter. 2630 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2631 !method->IsNative() && !method->IsProxyMethod(); 2632} 2633 2634void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2635 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2636 if (klass->NumDirectMethods() == 0) { 2637 return; // No direct methods => no static methods. 2638 } 2639 Runtime* runtime = Runtime::Current(); 2640 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2641 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2642 return; // OAT file unavailable. 2643 } 2644 } 2645 2646 const DexFile& dex_file = klass->GetDexFile(); 2647 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2648 CHECK(dex_class_def != nullptr); 2649 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2650 // There should always be class data if there were direct methods. 2651 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2652 ClassDataItemIterator it(dex_file, class_data); 2653 // Skip fields 2654 while (it.HasNextStaticField()) { 2655 it.Next(); 2656 } 2657 while (it.HasNextInstanceField()) { 2658 it.Next(); 2659 } 2660 bool has_oat_class; 2661 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2662 &has_oat_class); 2663 // Link the code of methods skipped by LinkCode. 2664 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2665 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2666 if (!method->IsStatic()) { 2667 // Only update static methods. 2668 continue; 2669 } 2670 const void* portable_code = nullptr; 2671 const void* quick_code = nullptr; 2672 if (has_oat_class) { 2673 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2674 portable_code = oat_method.GetPortableCode(); 2675 quick_code = oat_method.GetQuickCode(); 2676 } 2677 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2678 bool have_portable_code = false; 2679 if (enter_interpreter) { 2680 // Use interpreter entry point. 2681 // Check whether the method is native, in which case it's generic JNI. 2682 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2683 quick_code = GetQuickGenericJniTrampoline(); 2684 portable_code = GetPortableToQuickBridge(); 2685 } else { 2686 portable_code = GetPortableToInterpreterBridge(); 2687 quick_code = GetQuickToInterpreterBridge(); 2688 } 2689 } else { 2690 if (portable_code == nullptr) { 2691 portable_code = GetPortableToQuickBridge(); 2692 } else { 2693 have_portable_code = true; 2694 } 2695 if (quick_code == nullptr) { 2696 quick_code = GetQuickToPortableBridge(); 2697 } 2698 } 2699 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2700 have_portable_code); 2701 } 2702 // Ignore virtual methods on the iterator. 2703} 2704 2705void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2706 const OatFile::OatClass* oat_class, 2707 const DexFile& dex_file, uint32_t dex_method_index, 2708 uint32_t method_index) { 2709 if (Runtime::Current()->IsCompiler()) { 2710 // The following code only applies to a non-compiler runtime. 2711 return; 2712 } 2713 // Method shouldn't have already been linked. 2714 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2715 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2716 if (oat_class != nullptr) { 2717 // Every kind of method should at least get an invoke stub from the oat_method. 2718 // non-abstract methods also get their code pointers. 2719 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2720 oat_method.LinkMethod(method.Get()); 2721 } 2722 2723 // Install entry point from interpreter. 2724 bool enter_interpreter = NeedsInterpreter(method.Get(), 2725 method->GetEntryPointFromQuickCompiledCode(), 2726 method->GetEntryPointFromPortableCompiledCode()); 2727 if (enter_interpreter && !method->IsNative()) { 2728 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2729 } else { 2730 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2731 } 2732 2733 if (method->IsAbstract()) { 2734 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2735 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2736 return; 2737 } 2738 2739 bool have_portable_code = false; 2740 if (method->IsStatic() && !method->IsConstructor()) { 2741 // For static methods excluding the class initializer, install the trampoline. 2742 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2743 // after initializing class (see ClassLinker::InitializeClass method). 2744 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2745 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2746 } else if (enter_interpreter) { 2747 if (!method->IsNative()) { 2748 // Set entry point from compiled code if there's no code or in interpreter only mode. 2749 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2750 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2751 } else { 2752 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2753 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2754 } 2755 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2756 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2757 have_portable_code = true; 2758 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2759 } else { 2760 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2761 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2762 } 2763 2764 if (method->IsNative()) { 2765 // Unregistering restores the dlsym lookup stub. 2766 method->UnregisterNative(Thread::Current()); 2767 2768 if (enter_interpreter) { 2769 // We have a native method here without code. Then it should have either the GenericJni 2770 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2771 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2772 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2773 } 2774 } 2775 2776 // Allow instrumentation its chance to hijack code. 2777 Runtime* runtime = Runtime::Current(); 2778 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2779 method->GetEntryPointFromQuickCompiledCode(), 2780 method->GetEntryPointFromPortableCompiledCode(), 2781 have_portable_code); 2782} 2783 2784 2785 2786void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2787 const DexFile::ClassDef& dex_class_def, 2788 Handle<mirror::Class> klass, 2789 mirror::ClassLoader* class_loader) { 2790 CHECK(klass.Get() != nullptr); 2791 CHECK(klass->GetDexCache() != nullptr); 2792 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2793 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2794 CHECK(descriptor != nullptr); 2795 2796 klass->SetClass(GetClassRoot(kJavaLangClass)); 2797 if (kUseBakerOrBrooksReadBarrier) { 2798 klass->AssertReadBarrierPointer(); 2799 } 2800 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2801 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2802 klass->SetAccessFlags(access_flags); 2803 klass->SetClassLoader(class_loader); 2804 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2805 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2806 2807 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2808 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2809 2810 const byte* class_data = dex_file.GetClassData(dex_class_def); 2811 if (class_data == nullptr) { 2812 return; // no fields or methods - for example a marker interface 2813 } 2814 2815 2816 bool has_oat_class = false; 2817 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2818 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2819 &has_oat_class); 2820 if (has_oat_class) { 2821 LoadClassMembers(self, dex_file, class_data, klass, class_loader, &oat_class); 2822 } 2823 } 2824 if (!has_oat_class) { 2825 LoadClassMembers(self, dex_file, class_data, klass, class_loader, nullptr); 2826 } 2827} 2828 2829void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2830 const byte* class_data, 2831 Handle<mirror::Class> klass, 2832 mirror::ClassLoader* class_loader, 2833 const OatFile::OatClass* oat_class) { 2834 // Load fields. 2835 ClassDataItemIterator it(dex_file, class_data); 2836 if (it.NumStaticFields() != 0) { 2837 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2838 if (UNLIKELY(statics == nullptr)) { 2839 CHECK(self->IsExceptionPending()); // OOME. 2840 return; 2841 } 2842 klass->SetSFields(statics); 2843 } 2844 if (it.NumInstanceFields() != 0) { 2845 mirror::ObjectArray<mirror::ArtField>* fields = 2846 AllocArtFieldArray(self, it.NumInstanceFields()); 2847 if (UNLIKELY(fields == nullptr)) { 2848 CHECK(self->IsExceptionPending()); // OOME. 2849 return; 2850 } 2851 klass->SetIFields(fields); 2852 } 2853 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2854 self->AllowThreadSuspension(); 2855 StackHandleScope<1> hs(self); 2856 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2857 if (UNLIKELY(sfield.Get() == nullptr)) { 2858 CHECK(self->IsExceptionPending()); // OOME. 2859 return; 2860 } 2861 klass->SetStaticField(i, sfield.Get()); 2862 LoadField(dex_file, it, klass, sfield); 2863 } 2864 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2865 self->AllowThreadSuspension(); 2866 StackHandleScope<1> hs(self); 2867 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2868 if (UNLIKELY(ifield.Get() == nullptr)) { 2869 CHECK(self->IsExceptionPending()); // OOME. 2870 return; 2871 } 2872 klass->SetInstanceField(i, ifield.Get()); 2873 LoadField(dex_file, it, klass, ifield); 2874 } 2875 2876 // Load methods. 2877 if (it.NumDirectMethods() != 0) { 2878 // TODO: append direct methods to class object 2879 mirror::ObjectArray<mirror::ArtMethod>* directs = 2880 AllocArtMethodArray(self, it.NumDirectMethods()); 2881 if (UNLIKELY(directs == nullptr)) { 2882 CHECK(self->IsExceptionPending()); // OOME. 2883 return; 2884 } 2885 klass->SetDirectMethods(directs); 2886 } 2887 if (it.NumVirtualMethods() != 0) { 2888 // TODO: append direct methods to class object 2889 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2890 AllocArtMethodArray(self, it.NumVirtualMethods()); 2891 if (UNLIKELY(virtuals == nullptr)) { 2892 CHECK(self->IsExceptionPending()); // OOME. 2893 return; 2894 } 2895 klass->SetVirtualMethods(virtuals); 2896 } 2897 size_t class_def_method_index = 0; 2898 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2899 size_t last_class_def_method_index = 0; 2900 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2901 self->AllowThreadSuspension(); 2902 StackHandleScope<1> hs(self); 2903 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2904 if (UNLIKELY(method.Get() == nullptr)) { 2905 CHECK(self->IsExceptionPending()); // OOME. 2906 return; 2907 } 2908 klass->SetDirectMethod(i, method.Get()); 2909 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2910 uint32_t it_method_index = it.GetMemberIndex(); 2911 if (last_dex_method_index == it_method_index) { 2912 // duplicate case 2913 method->SetMethodIndex(last_class_def_method_index); 2914 } else { 2915 method->SetMethodIndex(class_def_method_index); 2916 last_dex_method_index = it_method_index; 2917 last_class_def_method_index = class_def_method_index; 2918 } 2919 class_def_method_index++; 2920 } 2921 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2922 self->AllowThreadSuspension(); 2923 StackHandleScope<1> hs(self); 2924 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2925 if (UNLIKELY(method.Get() == nullptr)) { 2926 CHECK(self->IsExceptionPending()); // OOME. 2927 return; 2928 } 2929 klass->SetVirtualMethod(i, method.Get()); 2930 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2931 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2932 class_def_method_index++; 2933 } 2934 DCHECK(!it.HasNext()); 2935} 2936 2937void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2938 Handle<mirror::Class> klass, 2939 Handle<mirror::ArtField> dst) { 2940 uint32_t field_idx = it.GetMemberIndex(); 2941 dst->SetDexFieldIndex(field_idx); 2942 dst->SetDeclaringClass(klass.Get()); 2943 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2944} 2945 2946mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2947 const ClassDataItemIterator& it, 2948 Handle<mirror::Class> klass) { 2949 uint32_t dex_method_idx = it.GetMemberIndex(); 2950 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2951 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2952 2953 mirror::ArtMethod* dst = AllocArtMethod(self); 2954 if (UNLIKELY(dst == nullptr)) { 2955 CHECK(self->IsExceptionPending()); // OOME. 2956 return nullptr; 2957 } 2958 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2959 2960 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2961 dst->SetDexMethodIndex(dex_method_idx); 2962 dst->SetDeclaringClass(klass.Get()); 2963 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2964 2965 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2966 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2967 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2968 2969 uint32_t access_flags = it.GetMethodAccessFlags(); 2970 2971 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2972 // Set finalizable flag on declaring class. 2973 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2974 // Void return type. 2975 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2976 klass->SetFinalizable(); 2977 } else { 2978 std::string temp; 2979 const char* klass_descriptor = klass->GetDescriptor(&temp); 2980 // The Enum class declares a "final" finalize() method to prevent subclasses from 2981 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2982 // subclasses, so we exclude it here. 2983 // We also want to avoid setting the flag on Object, where we know that finalize() is 2984 // empty. 2985 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2986 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2987 klass->SetFinalizable(); 2988 } 2989 } 2990 } 2991 } else if (method_name[0] == '<') { 2992 // Fix broken access flags for initializers. Bug 11157540. 2993 bool is_init = (strcmp("<init>", method_name) == 0); 2994 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2995 if (UNLIKELY(!is_init && !is_clinit)) { 2996 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2997 } else { 2998 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2999 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 3000 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 3001 access_flags |= kAccConstructor; 3002 } 3003 } 3004 } 3005 dst->SetAccessFlags(access_flags); 3006 3007 return dst; 3008} 3009 3010void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 3011 StackHandleScope<1> hs(self); 3012 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3013 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3014 << dex_file.GetLocation(); 3015 AppendToBootClassPath(dex_file, dex_cache); 3016} 3017 3018void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 3019 Handle<mirror::DexCache> dex_cache) { 3020 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3021 boot_class_path_.push_back(&dex_file); 3022 RegisterDexFile(dex_file, dex_cache); 3023} 3024 3025bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 3026 dex_lock_.AssertSharedHeld(Thread::Current()); 3027 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3028 mirror::DexCache* dex_cache = GetDexCache(i); 3029 if (dex_cache->GetDexFile() == &dex_file) { 3030 return true; 3031 } 3032 } 3033 return false; 3034} 3035 3036bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3037 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3038 return IsDexFileRegisteredLocked(dex_file); 3039} 3040 3041void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3042 Handle<mirror::DexCache> dex_cache) { 3043 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3044 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3045 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3046 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3047 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3048 dex_cache->SetDexFile(&dex_file); 3049 if (log_new_dex_caches_roots_) { 3050 // TODO: This is not safe if we can remove dex caches. 3051 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3052 } 3053} 3054 3055void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3056 Thread* self = Thread::Current(); 3057 { 3058 ReaderMutexLock mu(self, dex_lock_); 3059 if (IsDexFileRegisteredLocked(dex_file)) { 3060 return; 3061 } 3062 } 3063 // Don't alloc while holding the lock, since allocation may need to 3064 // suspend all threads and another thread may need the dex_lock_ to 3065 // get to a suspend point. 3066 StackHandleScope<1> hs(self); 3067 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3068 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3069 << dex_file.GetLocation(); 3070 { 3071 WriterMutexLock mu(self, dex_lock_); 3072 if (IsDexFileRegisteredLocked(dex_file)) { 3073 return; 3074 } 3075 RegisterDexFileLocked(dex_file, dex_cache); 3076 } 3077} 3078 3079void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3080 Handle<mirror::DexCache> dex_cache) { 3081 WriterMutexLock mu(Thread::Current(), dex_lock_); 3082 RegisterDexFileLocked(dex_file, dex_cache); 3083} 3084 3085mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3086 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3087 // Search assuming unique-ness of dex file. 3088 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3089 mirror::DexCache* dex_cache = GetDexCache(i); 3090 if (dex_cache->GetDexFile() == &dex_file) { 3091 return dex_cache; 3092 } 3093 } 3094 // Search matching by location name. 3095 std::string location(dex_file.GetLocation()); 3096 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3097 mirror::DexCache* dex_cache = GetDexCache(i); 3098 if (dex_cache->GetDexFile()->GetLocation() == location) { 3099 return dex_cache; 3100 } 3101 } 3102 // Failure, dump diagnostic and abort. 3103 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3104 mirror::DexCache* dex_cache = GetDexCache(i); 3105 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3106 } 3107 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3108 return nullptr; 3109} 3110 3111void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3112 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3113 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3114 mirror::DexCache* dex_cache = GetDexCache(i); 3115 dex_cache->Fixup(resolution_method); 3116 } 3117} 3118 3119mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3120 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3121 if (UNLIKELY(klass == nullptr)) { 3122 return nullptr; 3123 } 3124 return InitializePrimitiveClass(klass, type); 3125} 3126 3127mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3128 Primitive::Type type) { 3129 CHECK(primitive_class != nullptr); 3130 // Must hold lock on object when initializing. 3131 Thread* self = Thread::Current(); 3132 StackHandleScope<1> hs(self); 3133 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3134 ObjectLock<mirror::Class> lock(self, h_class); 3135 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3136 primitive_class->SetPrimitiveType(type); 3137 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3138 const char* descriptor = Primitive::Descriptor(type); 3139 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3140 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3141 return primitive_class; 3142} 3143 3144// Create an array class (i.e. the class object for the array, not the 3145// array itself). "descriptor" looks like "[C" or "[[[[B" or 3146// "[Ljava/lang/String;". 3147// 3148// If "descriptor" refers to an array of primitives, look up the 3149// primitive type's internally-generated class object. 3150// 3151// "class_loader" is the class loader of the class that's referring to 3152// us. It's used to ensure that we're looking for the element type in 3153// the right context. It does NOT become the class loader for the 3154// array class; that always comes from the base element class. 3155// 3156// Returns nullptr with an exception raised on failure. 3157mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3158 Handle<mirror::ClassLoader> class_loader) { 3159 // Identify the underlying component type 3160 CHECK_EQ('[', descriptor[0]); 3161 StackHandleScope<2> hs(self); 3162 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3163 class_loader))); 3164 if (component_type.Get() == nullptr) { 3165 DCHECK(self->IsExceptionPending()); 3166 // We need to accept erroneous classes as component types. 3167 component_type.Assign(LookupClass(self, descriptor + 1, class_loader.Get())); 3168 if (component_type.Get() == nullptr) { 3169 DCHECK(self->IsExceptionPending()); 3170 return nullptr; 3171 } else { 3172 self->ClearException(); 3173 } 3174 } 3175 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3176 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3177 return nullptr; 3178 } 3179 // See if the component type is already loaded. Array classes are 3180 // always associated with the class loader of their underlying 3181 // element type -- an array of Strings goes with the loader for 3182 // java/lang/String -- so we need to look for it there. (The 3183 // caller should have checked for the existence of the class 3184 // before calling here, but they did so with *their* class loader, 3185 // not the component type's loader.) 3186 // 3187 // If we find it, the caller adds "loader" to the class' initiating 3188 // loader list, which should prevent us from going through this again. 3189 // 3190 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3191 // are the same, because our caller (FindClass) just did the 3192 // lookup. (Even if we get this wrong we still have correct behavior, 3193 // because we effectively do this lookup again when we add the new 3194 // class to the hash table --- necessary because of possible races with 3195 // other threads.) 3196 if (class_loader.Get() != component_type->GetClassLoader()) { 3197 mirror::Class* new_class = LookupClass(self, descriptor, component_type->GetClassLoader()); 3198 if (new_class != nullptr) { 3199 return new_class; 3200 } 3201 } 3202 3203 // Fill out the fields in the Class. 3204 // 3205 // It is possible to execute some methods against arrays, because 3206 // all arrays are subclasses of java_lang_Object_, so we need to set 3207 // up a vtable. We can just point at the one in java_lang_Object_. 3208 // 3209 // Array classes are simple enough that we don't need to do a full 3210 // link step. 3211 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3212 if (UNLIKELY(!init_done_)) { 3213 // Classes that were hand created, ie not by FindSystemClass 3214 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3215 new_class.Assign(GetClassRoot(kClassArrayClass)); 3216 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3217 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3218 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3219 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3220 } else if (strcmp(descriptor, 3221 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3222 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3223 } else if (strcmp(descriptor, 3224 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3225 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3226 } else if (strcmp(descriptor, "[C") == 0) { 3227 new_class.Assign(GetClassRoot(kCharArrayClass)); 3228 } else if (strcmp(descriptor, "[I") == 0) { 3229 new_class.Assign(GetClassRoot(kIntArrayClass)); 3230 } 3231 } 3232 if (new_class.Get() == nullptr) { 3233 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3234 if (new_class.Get() == nullptr) { 3235 return nullptr; 3236 } 3237 new_class->SetComponentType(component_type.Get()); 3238 } 3239 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3240 DCHECK(new_class->GetComponentType() != nullptr); 3241 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3242 new_class->SetSuperClass(java_lang_Object); 3243 new_class->SetVTable(java_lang_Object->GetVTable()); 3244 new_class->SetPrimitiveType(Primitive::kPrimNot); 3245 new_class->SetClassLoader(component_type->GetClassLoader()); 3246 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3247 new_class->PopulateEmbeddedImtAndVTable(); 3248 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3249 // don't need to set new_class->SetObjectSize(..) 3250 // because Object::SizeOf delegates to Array::SizeOf 3251 3252 3253 // All arrays have java/lang/Cloneable and java/io/Serializable as 3254 // interfaces. We need to set that up here, so that stuff like 3255 // "instanceof" works right. 3256 // 3257 // Note: The GC could run during the call to FindSystemClass, 3258 // so we need to make sure the class object is GC-valid while we're in 3259 // there. Do this by clearing the interface list so the GC will just 3260 // think that the entries are null. 3261 3262 3263 // Use the single, global copies of "interfaces" and "iftable" 3264 // (remember not to free them for arrays). 3265 { 3266 mirror::IfTable* array_iftable = array_iftable_.Read(); 3267 CHECK(array_iftable != nullptr); 3268 new_class->SetIfTable(array_iftable); 3269 } 3270 3271 // Inherit access flags from the component type. 3272 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3273 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3274 access_flags &= kAccJavaFlagsMask; 3275 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3276 // and remove "interface". 3277 access_flags |= kAccAbstract | kAccFinal; 3278 access_flags &= ~kAccInterface; 3279 3280 new_class->SetAccessFlags(access_flags); 3281 3282 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3283 if (existing == nullptr) { 3284 return new_class.Get(); 3285 } 3286 // Another thread must have loaded the class after we 3287 // started but before we finished. Abandon what we've 3288 // done. 3289 // 3290 // (Yes, this happens.) 3291 3292 return existing; 3293} 3294 3295mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3296 switch (type) { 3297 case 'B': 3298 return GetClassRoot(kPrimitiveByte); 3299 case 'C': 3300 return GetClassRoot(kPrimitiveChar); 3301 case 'D': 3302 return GetClassRoot(kPrimitiveDouble); 3303 case 'F': 3304 return GetClassRoot(kPrimitiveFloat); 3305 case 'I': 3306 return GetClassRoot(kPrimitiveInt); 3307 case 'J': 3308 return GetClassRoot(kPrimitiveLong); 3309 case 'S': 3310 return GetClassRoot(kPrimitiveShort); 3311 case 'Z': 3312 return GetClassRoot(kPrimitiveBoolean); 3313 case 'V': 3314 return GetClassRoot(kPrimitiveVoid); 3315 default: 3316 break; 3317 } 3318 std::string printable_type(PrintableChar(type)); 3319 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3320 return nullptr; 3321} 3322 3323mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3324 size_t hash) { 3325 if (VLOG_IS_ON(class_linker)) { 3326 mirror::DexCache* dex_cache = klass->GetDexCache(); 3327 std::string source; 3328 if (dex_cache != nullptr) { 3329 source += " from "; 3330 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3331 } 3332 LOG(INFO) << "Loaded class " << descriptor << source; 3333 } 3334 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3335 mirror::Class* existing = 3336 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3337 if (existing != nullptr) { 3338 return existing; 3339 } 3340 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3341 dex_cache_image_class_lookup_required_) { 3342 // Check a class loaded with the system class loader matches one in the image if the class 3343 // is in the image. 3344 existing = LookupClassFromImage(descriptor); 3345 if (existing != nullptr) { 3346 CHECK(klass == existing); 3347 } 3348 } 3349 VerifyObject(klass); 3350 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3351 if (log_new_class_table_roots_) { 3352 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3353 } 3354 return nullptr; 3355} 3356 3357mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3358 size_t hash) { 3359 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3360 mirror::Class* existing = 3361 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3362 3363 if (existing == nullptr) { 3364 CHECK(klass->IsProxyClass()); 3365 return nullptr; 3366 } 3367 3368 CHECK_NE(existing, klass) << descriptor; 3369 CHECK(!existing->IsResolved()) << descriptor; 3370 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3371 3372 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3373 it != end && it->first == hash; ++it) { 3374 mirror::Class* klass = it->second.Read(); 3375 if (klass == existing) { 3376 class_table_.erase(it); 3377 break; 3378 } 3379 } 3380 3381 CHECK(!klass->IsTemp()) << descriptor; 3382 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3383 dex_cache_image_class_lookup_required_) { 3384 // Check a class loaded with the system class loader matches one in the image if the class 3385 // is in the image. 3386 existing = LookupClassFromImage(descriptor); 3387 if (existing != nullptr) { 3388 CHECK(klass == existing) << descriptor; 3389 } 3390 } 3391 VerifyObject(klass); 3392 3393 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3394 if (log_new_class_table_roots_) { 3395 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3396 } 3397 3398 return existing; 3399} 3400 3401bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3402 size_t hash = Hash(descriptor); 3403 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3404 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3405 it != end && it->first == hash; 3406 ++it) { 3407 mirror::Class* klass = it->second.Read(); 3408 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3409 class_table_.erase(it); 3410 return true; 3411 } 3412 } 3413 return false; 3414} 3415 3416mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, 3417 const mirror::ClassLoader* class_loader) { 3418 size_t hash = Hash(descriptor); 3419 { 3420 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3421 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3422 if (result != nullptr) { 3423 return result; 3424 } 3425 } 3426 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3427 return nullptr; 3428 } else { 3429 // Lookup failed but need to search dex_caches_. 3430 mirror::Class* result = LookupClassFromImage(descriptor); 3431 if (result != nullptr) { 3432 InsertClass(descriptor, result, hash); 3433 } else { 3434 // Searching the image dex files/caches failed, we don't want to get into this situation 3435 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3436 // classes into the class table. 3437 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3438 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3439 MoveImageClassesToClassTable(); 3440 } 3441 } 3442 return result; 3443 } 3444} 3445 3446mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3447 const mirror::ClassLoader* class_loader, 3448 size_t hash) { 3449 auto end = class_table_.end(); 3450 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3451 mirror::Class* klass = it->second.Read(); 3452 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3453 if (kIsDebugBuild) { 3454 // Check for duplicates in the table. 3455 for (++it; it != end && it->first == hash; ++it) { 3456 mirror::Class* klass2 = it->second.Read(); 3457 CHECK(!(klass2->GetClassLoader() == class_loader && 3458 klass2->DescriptorEquals(descriptor))) 3459 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3460 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3461 } 3462 } 3463 return klass; 3464 } 3465 } 3466 return nullptr; 3467} 3468 3469static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3470 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3471 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3472 CHECK(image != nullptr); 3473 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3474 return root->AsObjectArray<mirror::DexCache>(); 3475} 3476 3477void ClassLinker::MoveImageClassesToClassTable() { 3478 Thread* self = Thread::Current(); 3479 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3480 if (!dex_cache_image_class_lookup_required_) { 3481 return; // All dex cache classes are already in the class table. 3482 } 3483 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3484 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3485 std::string temp; 3486 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3487 mirror::DexCache* dex_cache = dex_caches->Get(i); 3488 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3489 for (int32_t j = 0; j < types->GetLength(); j++) { 3490 mirror::Class* klass = types->Get(j); 3491 if (klass != nullptr) { 3492 DCHECK(klass->GetClassLoader() == nullptr); 3493 const char* descriptor = klass->GetDescriptor(&temp); 3494 size_t hash = Hash(descriptor); 3495 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3496 if (existing != nullptr) { 3497 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3498 << PrettyClassAndClassLoader(klass); 3499 } else { 3500 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3501 if (log_new_class_table_roots_) { 3502 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3503 } 3504 } 3505 } 3506 } 3507 } 3508 dex_cache_image_class_lookup_required_ = false; 3509} 3510 3511mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3512 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3513 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3514 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3515 mirror::DexCache* dex_cache = dex_caches->Get(i); 3516 const DexFile* dex_file = dex_cache->GetDexFile(); 3517 // Try binary searching the string/type index. 3518 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3519 if (string_id != nullptr) { 3520 const DexFile::TypeId* type_id = 3521 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3522 if (type_id != nullptr) { 3523 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3524 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3525 if (klass != nullptr) { 3526 return klass; 3527 } 3528 } 3529 } 3530 } 3531 return nullptr; 3532} 3533 3534void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3535 result.clear(); 3536 if (dex_cache_image_class_lookup_required_) { 3537 MoveImageClassesToClassTable(); 3538 } 3539 size_t hash = Hash(descriptor); 3540 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3541 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3542 it != end && it->first == hash; ++it) { 3543 mirror::Class* klass = it->second.Read(); 3544 if (klass->DescriptorEquals(descriptor)) { 3545 result.push_back(klass); 3546 } 3547 } 3548} 3549 3550void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3551 // TODO: assert that the monitor on the Class is held 3552 ObjectLock<mirror::Class> lock(self, klass); 3553 3554 // Don't attempt to re-verify if already sufficiently verified. 3555 if (klass->IsVerified()) { 3556 EnsurePreverifiedMethods(klass); 3557 return; 3558 } 3559 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3560 return; 3561 } 3562 3563 // The class might already be erroneous, for example at compile time if we attempted to verify 3564 // this class as a parent to another. 3565 if (klass->IsErroneous()) { 3566 ThrowEarlierClassFailure(klass.Get()); 3567 return; 3568 } 3569 3570 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3571 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3572 } else { 3573 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3574 << PrettyClass(klass.Get()); 3575 CHECK(!Runtime::Current()->IsCompiler()); 3576 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3577 } 3578 3579 // Skip verification if disabled. 3580 if (!Runtime::Current()->IsVerificationEnabled()) { 3581 klass->SetStatus(mirror::Class::kStatusVerified, self); 3582 EnsurePreverifiedMethods(klass); 3583 return; 3584 } 3585 3586 // Verify super class. 3587 StackHandleScope<2> hs(self); 3588 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3589 if (super.Get() != nullptr) { 3590 // Acquire lock to prevent races on verifying the super class. 3591 ObjectLock<mirror::Class> lock(self, super); 3592 3593 if (!super->IsVerified() && !super->IsErroneous()) { 3594 VerifyClass(self, super); 3595 } 3596 if (!super->IsCompileTimeVerified()) { 3597 std::string error_msg( 3598 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3599 PrettyDescriptor(klass.Get()).c_str(), 3600 PrettyDescriptor(super.Get()).c_str())); 3601 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3602 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3603 if (cause.Get() != nullptr) { 3604 self->ClearException(); 3605 } 3606 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3607 if (cause.Get() != nullptr) { 3608 self->GetException(nullptr)->SetCause(cause.Get()); 3609 } 3610 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3611 if (Runtime::Current()->IsCompiler()) { 3612 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3613 } 3614 klass->SetStatus(mirror::Class::kStatusError, self); 3615 return; 3616 } 3617 } 3618 3619 // Try to use verification information from the oat file, otherwise do runtime verification. 3620 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3621 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3622 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3623 if (oat_file_class_status == mirror::Class::kStatusError) { 3624 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3625 << PrettyDescriptor(klass.Get()) << " in " 3626 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3627 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3628 PrettyDescriptor(klass.Get()).c_str()); 3629 klass->SetStatus(mirror::Class::kStatusError, self); 3630 return; 3631 } 3632 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3633 std::string error_msg; 3634 if (!preverified) { 3635 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3636 Runtime::Current()->IsCompiler(), 3637 &error_msg); 3638 } 3639 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3640 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3641 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3642 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3643 << " because: " << error_msg; 3644 } 3645 self->AssertNoPendingException(); 3646 // Make sure all classes referenced by catch blocks are resolved. 3647 ResolveClassExceptionHandlerTypes(dex_file, klass); 3648 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3649 // Even though there were no verifier failures we need to respect whether the super-class 3650 // was verified or requiring runtime reverification. 3651 if (super.Get() == nullptr || super->IsVerified()) { 3652 klass->SetStatus(mirror::Class::kStatusVerified, self); 3653 } else { 3654 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3655 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3656 // Pretend a soft failure occured so that we don't consider the class verified below. 3657 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3658 } 3659 } else { 3660 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3661 // Soft failures at compile time should be retried at runtime. Soft 3662 // failures at runtime will be handled by slow paths in the generated 3663 // code. Set status accordingly. 3664 if (Runtime::Current()->IsCompiler()) { 3665 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3666 } else { 3667 klass->SetStatus(mirror::Class::kStatusVerified, self); 3668 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3669 // later. 3670 klass->SetPreverified(); 3671 } 3672 } 3673 } else { 3674 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3675 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3676 << " because: " << error_msg; 3677 self->AssertNoPendingException(); 3678 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3679 klass->SetStatus(mirror::Class::kStatusError, self); 3680 } 3681 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3682 // Class is verified so we don't need to do any access check on its methods. 3683 // Let the interpreter know it by setting the kAccPreverified flag onto each 3684 // method. 3685 // Note: we're going here during compilation and at runtime. When we set the 3686 // kAccPreverified flag when compiling image classes, the flag is recorded 3687 // in the image and is set when loading the image. 3688 EnsurePreverifiedMethods(klass); 3689 } 3690} 3691 3692void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3693 if (!klass->IsPreverified()) { 3694 klass->SetPreverifiedFlagOnAllMethods(); 3695 klass->SetPreverified(); 3696 } 3697} 3698 3699bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3700 mirror::Class::Status& oat_file_class_status) { 3701 // If we're compiling, we can only verify the class using the oat file if 3702 // we are not compiling the image or if the class we're verifying is not part of 3703 // the app. In other words, we will only check for preverification of bootclasspath 3704 // classes. 3705 if (Runtime::Current()->IsCompiler()) { 3706 // Are we compiling the bootclasspath? 3707 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3708 return false; 3709 } 3710 // We are compiling an app (not the image). 3711 3712 // Is this an app class? (I.e. not a bootclasspath class) 3713 if (klass->GetClassLoader() != nullptr) { 3714 return false; 3715 } 3716 } 3717 3718 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3719 // In case we run without an image there won't be a backing oat file. 3720 if (oat_dex_file == nullptr) { 3721 return false; 3722 } 3723 3724 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3725 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3726 if (oat_file_class_status == mirror::Class::kStatusVerified || 3727 oat_file_class_status == mirror::Class::kStatusInitialized) { 3728 return true; 3729 } 3730 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3731 // Compile time verification failed with a soft error. Compile time verification can fail 3732 // because we have incomplete type information. Consider the following: 3733 // class ... { 3734 // Foo x; 3735 // .... () { 3736 // if (...) { 3737 // v1 gets assigned a type of resolved class Foo 3738 // } else { 3739 // v1 gets assigned a type of unresolved class Bar 3740 // } 3741 // iput x = v1 3742 // } } 3743 // when we merge v1 following the if-the-else it results in Conflict 3744 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3745 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3746 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3747 // at compile time). 3748 return false; 3749 } 3750 if (oat_file_class_status == mirror::Class::kStatusError) { 3751 // Compile time verification failed with a hard error. This is caused by invalid instructions 3752 // in the class. These errors are unrecoverable. 3753 return false; 3754 } 3755 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3756 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3757 // not loading the class. 3758 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3759 // isn't a problem and this case shouldn't occur 3760 return false; 3761 } 3762 std::string temp; 3763 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3764 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3765 << klass->GetDescriptor(&temp); 3766 3767 return false; 3768} 3769 3770void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3771 Handle<mirror::Class> klass) { 3772 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3773 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3774 } 3775 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3776 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3777 } 3778} 3779 3780void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3781 mirror::ArtMethod* method) { 3782 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3783 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3784 if (code_item == nullptr) { 3785 return; // native or abstract method 3786 } 3787 if (code_item->tries_size_ == 0) { 3788 return; // nothing to process 3789 } 3790 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3791 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3792 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3793 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3794 CatchHandlerIterator iterator(handlers_ptr); 3795 for (; iterator.HasNext(); iterator.Next()) { 3796 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3797 // unresolved exception types will be ignored by exception delivery 3798 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3799 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3800 if (exception_type == nullptr) { 3801 DCHECK(Thread::Current()->IsExceptionPending()); 3802 Thread::Current()->ClearException(); 3803 } 3804 } 3805 } 3806 handlers_ptr = iterator.EndDataPointer(); 3807 } 3808} 3809 3810static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3811static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3812 Handle<mirror::ArtMethod> prototype); 3813 3814mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3815 jobjectArray interfaces, jobject loader, 3816 jobjectArray methods, jobjectArray throws) { 3817 Thread* self = soa.Self(); 3818 StackHandleScope<8> hs(self); 3819 MutableHandle<mirror::Class> klass(hs.NewHandle( 3820 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3821 if (klass.Get() == nullptr) { 3822 CHECK(self->IsExceptionPending()); // OOME. 3823 return nullptr; 3824 } 3825 DCHECK(klass->GetClass() != nullptr); 3826 klass->SetObjectSize(sizeof(mirror::Proxy)); 3827 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3828 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3829 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3830 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3831 klass->SetName(soa.Decode<mirror::String*>(name)); 3832 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3833 klass->SetDexCache(proxy_class->GetDexCache()); 3834 klass->SetStatus(mirror::Class::kStatusIdx, self); 3835 3836 // Instance fields are inherited, but we add a couple of static fields... 3837 { 3838 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3839 if (UNLIKELY(sfields == nullptr)) { 3840 CHECK(self->IsExceptionPending()); // OOME. 3841 return nullptr; 3842 } 3843 klass->SetSFields(sfields); 3844 } 3845 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3846 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3847 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3848 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3849 CHECK(self->IsExceptionPending()); // OOME. 3850 return nullptr; 3851 } 3852 klass->SetStaticField(0, interfaces_sfield.Get()); 3853 interfaces_sfield->SetDexFieldIndex(0); 3854 interfaces_sfield->SetDeclaringClass(klass.Get()); 3855 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3856 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3857 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3858 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3859 CHECK(self->IsExceptionPending()); // OOME. 3860 return nullptr; 3861 } 3862 klass->SetStaticField(1, throws_sfield.Get()); 3863 throws_sfield->SetDexFieldIndex(1); 3864 throws_sfield->SetDeclaringClass(klass.Get()); 3865 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3866 3867 // Proxies have 1 direct method, the constructor 3868 { 3869 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3870 if (UNLIKELY(directs == nullptr)) { 3871 CHECK(self->IsExceptionPending()); // OOME. 3872 return nullptr; 3873 } 3874 klass->SetDirectMethods(directs); 3875 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3876 if (UNLIKELY(constructor == nullptr)) { 3877 CHECK(self->IsExceptionPending()); // OOME. 3878 return nullptr; 3879 } 3880 klass->SetDirectMethod(0, constructor); 3881 } 3882 3883 // Create virtual method using specified prototypes. 3884 size_t num_virtual_methods = 3885 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3886 { 3887 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3888 num_virtual_methods); 3889 if (UNLIKELY(virtuals == nullptr)) { 3890 CHECK(self->IsExceptionPending()); // OOME. 3891 return nullptr; 3892 } 3893 klass->SetVirtualMethods(virtuals); 3894 } 3895 for (size_t i = 0; i < num_virtual_methods; ++i) { 3896 StackHandleScope<1> hs(self); 3897 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3898 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3899 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3900 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3901 if (UNLIKELY(clone == nullptr)) { 3902 CHECK(self->IsExceptionPending()); // OOME. 3903 return nullptr; 3904 } 3905 klass->SetVirtualMethod(i, clone); 3906 } 3907 3908 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3909 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3910 self->AssertNoPendingException(); 3911 3912 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3913 mirror::Class* new_class = nullptr; 3914 { 3915 // Must hold lock on object when resolved. 3916 ObjectLock<mirror::Class> resolution_lock(self, klass); 3917 // Link the fields and virtual methods, creating vtable and iftables 3918 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3919 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3920 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3921 klass->SetStatus(mirror::Class::kStatusError, self); 3922 return nullptr; 3923 } 3924 } 3925 3926 CHECK(klass->IsRetired()); 3927 CHECK_NE(klass.Get(), new_class); 3928 klass.Assign(new_class); 3929 3930 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3931 interfaces_sfield->SetObject<false>(klass.Get(), 3932 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3933 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3934 throws_sfield->SetObject<false>(klass.Get(), 3935 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3936 3937 { 3938 // Lock on klass is released. Lock new class object. 3939 ObjectLock<mirror::Class> initialization_lock(self, klass); 3940 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3941 } 3942 3943 // sanity checks 3944 if (kIsDebugBuild) { 3945 CHECK(klass->GetIFields() == nullptr); 3946 CheckProxyConstructor(klass->GetDirectMethod(0)); 3947 for (size_t i = 0; i < num_virtual_methods; ++i) { 3948 StackHandleScope<2> hs(self); 3949 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3950 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3951 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3952 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3953 CheckProxyMethod(virtual_method, prototype); 3954 } 3955 3956 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3957 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3958 decoded_name->ToModifiedUtf8().c_str())); 3959 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3960 3961 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3962 decoded_name->ToModifiedUtf8().c_str())); 3963 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3964 3965 CHECK_EQ(klass.Get()->GetInterfaces(), 3966 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3967 CHECK_EQ(klass.Get()->GetThrows(), 3968 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3969 } 3970 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3971 CHECK(existing == nullptr); 3972 return klass.Get(); 3973} 3974 3975std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3976 DCHECK(proxy_class->IsProxyClass()); 3977 mirror::String* name = proxy_class->GetName(); 3978 DCHECK(name != nullptr); 3979 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3980} 3981 3982mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3983 mirror::ArtMethod* proxy_method) { 3984 DCHECK(proxy_class->IsProxyClass()); 3985 DCHECK(proxy_method->IsProxyMethod()); 3986 // Locate the dex cache of the original interface/Object 3987 mirror::DexCache* dex_cache = nullptr; 3988 { 3989 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3990 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3991 mirror::DexCache* a_dex_cache = GetDexCache(i); 3992 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3993 dex_cache = a_dex_cache; 3994 break; 3995 } 3996 } 3997 } 3998 CHECK(dex_cache != nullptr); 3999 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 4000 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 4001 CHECK(resolved_method != nullptr); 4002 return resolved_method; 4003} 4004 4005 4006mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 4007 Handle<mirror::Class> klass, 4008 mirror::Class* proxy_class) { 4009 // Create constructor for Proxy that must initialize h 4010 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 4011 proxy_class->GetDirectMethods(); 4012 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 4013 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 4014 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 4015 // constructor method. 4016 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 4017 proxy_constructor); 4018 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 4019 // code_ too) 4020 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 4021 if (constructor == nullptr) { 4022 CHECK(self->IsExceptionPending()); // OOME. 4023 return nullptr; 4024 } 4025 // Make this constructor public and fix the class to be our Proxy version 4026 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 4027 constructor->SetDeclaringClass(klass.Get()); 4028 return constructor; 4029} 4030 4031static void CheckProxyConstructor(mirror::ArtMethod* constructor) 4032 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4033 CHECK(constructor->IsConstructor()); 4034 CHECK_STREQ(constructor->GetName(), "<init>"); 4035 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4036 "(Ljava/lang/reflect/InvocationHandler;)V"); 4037 DCHECK(constructor->IsPublic()); 4038} 4039 4040mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4041 Handle<mirror::Class> klass, 4042 Handle<mirror::ArtMethod> prototype) { 4043 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4044 // prototype method 4045 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4046 prototype.Get()); 4047 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4048 // as necessary 4049 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4050 if (UNLIKELY(method == nullptr)) { 4051 CHECK(self->IsExceptionPending()); // OOME. 4052 return nullptr; 4053 } 4054 4055 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4056 // the intersection of throw exceptions as defined in Proxy 4057 method->SetDeclaringClass(klass.Get()); 4058 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4059 4060 // At runtime the method looks like a reference and argument saving method, clone the code 4061 // related parameters from this method. 4062 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4063 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4064 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4065 4066 return method; 4067} 4068 4069static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4070 Handle<mirror::ArtMethod> prototype) 4071 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4072 // Basic sanity 4073 CHECK(!prototype->IsFinal()); 4074 CHECK(method->IsFinal()); 4075 CHECK(!method->IsAbstract()); 4076 4077 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4078 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4079 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4080 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4081 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4082 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4083 4084 StackHandleScope<2> hs(Thread::Current()); 4085 MethodHelper mh(hs.NewHandle(method.Get())); 4086 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4087 CHECK_STREQ(method->GetName(), prototype->GetName()); 4088 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4089 // More complex sanity - via dex cache 4090 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4091} 4092 4093static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4094 bool can_init_parents) 4095 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4096 if (can_init_statics && can_init_parents) { 4097 return true; 4098 } 4099 if (!can_init_statics) { 4100 // Check if there's a class initializer. 4101 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4102 if (clinit != nullptr) { 4103 return false; 4104 } 4105 // Check if there are encoded static values needing initialization. 4106 if (klass->NumStaticFields() != 0) { 4107 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4108 DCHECK(dex_class_def != nullptr); 4109 if (dex_class_def->static_values_off_ != 0) { 4110 return false; 4111 } 4112 } 4113 } 4114 if (!klass->IsInterface() && klass->HasSuperClass()) { 4115 mirror::Class* super_class = klass->GetSuperClass(); 4116 if (!can_init_parents && !super_class->IsInitialized()) { 4117 return false; 4118 } else { 4119 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4120 return false; 4121 } 4122 } 4123 } 4124 return true; 4125} 4126 4127bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4128 bool can_init_statics, bool can_init_parents) { 4129 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4130 4131 // Are we already initialized and therefore done? 4132 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4133 // an initialized class will never change its state. 4134 if (klass->IsInitialized()) { 4135 return true; 4136 } 4137 4138 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4139 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4140 return false; 4141 } 4142 4143 self->AllowThreadSuspension(); 4144 uint64_t t0; 4145 { 4146 ObjectLock<mirror::Class> lock(self, klass); 4147 4148 // Re-check under the lock in case another thread initialized ahead of us. 4149 if (klass->IsInitialized()) { 4150 return true; 4151 } 4152 4153 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4154 if (klass->IsErroneous()) { 4155 ThrowEarlierClassFailure(klass.Get()); 4156 return false; 4157 } 4158 4159 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4160 4161 if (!klass->IsVerified()) { 4162 VerifyClass(self, klass); 4163 if (!klass->IsVerified()) { 4164 // We failed to verify, expect either the klass to be erroneous or verification failed at 4165 // compile time. 4166 if (klass->IsErroneous()) { 4167 CHECK(self->IsExceptionPending()); 4168 } else { 4169 CHECK(Runtime::Current()->IsCompiler()); 4170 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4171 } 4172 return false; 4173 } else { 4174 self->AssertNoPendingException(); 4175 } 4176 } 4177 4178 // If the class is kStatusInitializing, either this thread is 4179 // initializing higher up the stack or another thread has beat us 4180 // to initializing and we need to wait. Either way, this 4181 // invocation of InitializeClass will not be responsible for 4182 // running <clinit> and will return. 4183 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4184 // Could have got an exception during verification. 4185 if (self->IsExceptionPending()) { 4186 return false; 4187 } 4188 // We caught somebody else in the act; was it us? 4189 if (klass->GetClinitThreadId() == self->GetTid()) { 4190 // Yes. That's fine. Return so we can continue initializing. 4191 return true; 4192 } 4193 // No. That's fine. Wait for another thread to finish initializing. 4194 return WaitForInitializeClass(klass, self, lock); 4195 } 4196 4197 if (!ValidateSuperClassDescriptors(klass)) { 4198 klass->SetStatus(mirror::Class::kStatusError, self); 4199 return false; 4200 } 4201 self->AllowThreadSuspension(); 4202 4203 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4204 4205 // From here out other threads may observe that we're initializing and so changes of state 4206 // require the a notification. 4207 klass->SetClinitThreadId(self->GetTid()); 4208 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4209 4210 t0 = NanoTime(); 4211 } 4212 4213 // Initialize super classes, must be done while initializing for the JLS. 4214 if (!klass->IsInterface() && klass->HasSuperClass()) { 4215 mirror::Class* super_class = klass->GetSuperClass(); 4216 if (!super_class->IsInitialized()) { 4217 CHECK(!super_class->IsInterface()); 4218 CHECK(can_init_parents); 4219 StackHandleScope<1> hs(self); 4220 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4221 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4222 if (!super_initialized) { 4223 // The super class was verified ahead of entering initializing, we should only be here if 4224 // the super class became erroneous due to initialization. 4225 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4226 << "Super class initialization failed for " 4227 << PrettyDescriptor(handle_scope_super.Get()) 4228 << " that has unexpected status " << handle_scope_super->GetStatus() 4229 << "\nPending exception:\n" 4230 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4231 ObjectLock<mirror::Class> lock(self, klass); 4232 // Initialization failed because the super-class is erroneous. 4233 klass->SetStatus(mirror::Class::kStatusError, self); 4234 return false; 4235 } 4236 } 4237 } 4238 4239 if (klass->NumStaticFields() > 0) { 4240 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4241 CHECK(dex_class_def != nullptr); 4242 const DexFile& dex_file = klass->GetDexFile(); 4243 StackHandleScope<3> hs(self); 4244 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4245 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4246 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4247 this, *dex_class_def); 4248 const byte* class_data = dex_file.GetClassData(*dex_class_def); 4249 ClassDataItemIterator field_it(dex_file, class_data); 4250 if (value_it.HasNext()) { 4251 DCHECK(field_it.HasNextStaticField()); 4252 CHECK(can_init_statics); 4253 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4254 StackHandleScope<1> hs(self); 4255 Handle<mirror::ArtField> field(hs.NewHandle( 4256 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4257 if (Runtime::Current()->IsActiveTransaction()) { 4258 value_it.ReadValueToField<true>(field); 4259 } else { 4260 value_it.ReadValueToField<false>(field); 4261 } 4262 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4263 } 4264 } 4265 } 4266 4267 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4268 if (clinit != nullptr) { 4269 CHECK(can_init_statics); 4270 JValue result; 4271 clinit->Invoke(self, nullptr, 0, &result, "V"); 4272 } 4273 4274 self->AllowThreadSuspension(); 4275 uint64_t t1 = NanoTime(); 4276 4277 bool success = true; 4278 { 4279 ObjectLock<mirror::Class> lock(self, klass); 4280 4281 if (self->IsExceptionPending()) { 4282 WrapExceptionInInitializer(); 4283 klass->SetStatus(mirror::Class::kStatusError, self); 4284 success = false; 4285 } else { 4286 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4287 RuntimeStats* thread_stats = self->GetStats(); 4288 ++global_stats->class_init_count; 4289 ++thread_stats->class_init_count; 4290 global_stats->class_init_time_ns += (t1 - t0); 4291 thread_stats->class_init_time_ns += (t1 - t0); 4292 // Set the class as initialized except if failed to initialize static fields. 4293 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4294 if (VLOG_IS_ON(class_linker)) { 4295 std::string temp; 4296 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4297 klass->GetLocation(); 4298 } 4299 // Opportunistically set static method trampolines to their destination. 4300 FixupStaticTrampolines(klass.Get()); 4301 } 4302 } 4303 return success; 4304} 4305 4306bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4307 ObjectLock<mirror::Class>& lock) 4308 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4309 while (true) { 4310 self->AssertNoPendingException(); 4311 CHECK(!klass->IsInitialized()); 4312 lock.WaitIgnoringInterrupts(); 4313 4314 // When we wake up, repeat the test for init-in-progress. If 4315 // there's an exception pending (only possible if 4316 // "interruptShouldThrow" was set), bail out. 4317 if (self->IsExceptionPending()) { 4318 WrapExceptionInInitializer(); 4319 klass->SetStatus(mirror::Class::kStatusError, self); 4320 return false; 4321 } 4322 // Spurious wakeup? Go back to waiting. 4323 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4324 continue; 4325 } 4326 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4327 // Compile time initialization failed. 4328 return false; 4329 } 4330 if (klass->IsErroneous()) { 4331 // The caller wants an exception, but it was thrown in a 4332 // different thread. Synthesize one here. 4333 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4334 PrettyDescriptor(klass.Get()).c_str()); 4335 return false; 4336 } 4337 if (klass->IsInitialized()) { 4338 return true; 4339 } 4340 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4341 << klass->GetStatus(); 4342 } 4343 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4344} 4345 4346bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4347 if (klass->IsInterface()) { 4348 return true; 4349 } 4350 // Begin with the methods local to the superclass. 4351 StackHandleScope<2> hs(Thread::Current()); 4352 MutableMethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4353 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4354 if (klass->HasSuperClass() && 4355 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4356 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4357 mh.ChangeMethod(klass->GetVTableEntry(i)); 4358 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4359 if (mh.GetMethod() != super_mh.GetMethod() && 4360 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4361 ThrowLinkageError(klass.Get(), 4362 "Class %s method %s resolves differently in superclass %s", 4363 PrettyDescriptor(klass.Get()).c_str(), 4364 PrettyMethod(mh.GetMethod()).c_str(), 4365 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4366 return false; 4367 } 4368 } 4369 } 4370 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4371 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4372 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4373 for (uint32_t j = 0; j < num_methods; ++j) { 4374 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4375 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4376 if (mh.GetMethod() != super_mh.GetMethod() && 4377 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4378 ThrowLinkageError(klass.Get(), 4379 "Class %s method %s resolves differently in interface %s", 4380 PrettyDescriptor(klass.Get()).c_str(), 4381 PrettyMethod(mh.GetMethod()).c_str(), 4382 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4383 return false; 4384 } 4385 } 4386 } 4387 } 4388 return true; 4389} 4390 4391bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4392 bool can_init_parents) { 4393 DCHECK(c.Get() != nullptr); 4394 if (c->IsInitialized()) { 4395 EnsurePreverifiedMethods(c); 4396 return true; 4397 } 4398 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4399 if (!success) { 4400 if (can_init_fields && can_init_parents) { 4401 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4402 } 4403 } else { 4404 self->AssertNoPendingException(); 4405 } 4406 return success; 4407} 4408 4409void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4410 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4411 if (fields != nullptr) { 4412 for (int index = 0; index < fields->GetLength(); index ++) { 4413 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4414 fields->Get(index)->SetDeclaringClass(new_class); 4415 } 4416 } 4417 } 4418 4419 fields = new_class->GetSFields(); 4420 if (fields != nullptr) { 4421 for (int index = 0; index < fields->GetLength(); index ++) { 4422 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4423 fields->Get(index)->SetDeclaringClass(new_class); 4424 } 4425 } 4426 } 4427 4428 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4429 if (methods != nullptr) { 4430 for (int index = 0; index < methods->GetLength(); index ++) { 4431 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4432 methods->Get(index)->SetDeclaringClass(new_class); 4433 } 4434 } 4435 } 4436 4437 methods = new_class->GetVirtualMethods(); 4438 if (methods != nullptr) { 4439 for (int index = 0; index < methods->GetLength(); index ++) { 4440 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4441 methods->Get(index)->SetDeclaringClass(new_class); 4442 } 4443 } 4444 } 4445} 4446 4447bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4448 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4449 mirror::Class** new_class) { 4450 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4451 4452 if (!LinkSuperClass(klass)) { 4453 return false; 4454 } 4455 if (!LinkMethods(self, klass, interfaces)) { 4456 return false; 4457 } 4458 if (!LinkInstanceFields(self, klass)) { 4459 return false; 4460 } 4461 size_t class_size; 4462 if (!LinkStaticFields(self, klass, &class_size)) { 4463 return false; 4464 } 4465 CreateReferenceInstanceOffsets(klass); 4466 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4467 4468 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4469 // We don't need to retire this class as it has no embedded tables or it was created the 4470 // correct size during class linker initialization. 4471 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4472 4473 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4474 klass->PopulateEmbeddedImtAndVTable(); 4475 } 4476 4477 // This will notify waiters on klass that saw the not yet resolved 4478 // class in the class_table_ during EnsureResolved. 4479 klass->SetStatus(mirror::Class::kStatusResolved, self); 4480 *new_class = klass.Get(); 4481 } else { 4482 CHECK(!klass->IsResolved()); 4483 // Retire the temporary class and create the correctly sized resolved class. 4484 *new_class = klass->CopyOf(self, class_size); 4485 if (UNLIKELY(*new_class == nullptr)) { 4486 CHECK(self->IsExceptionPending()); // Expect an OOME. 4487 klass->SetStatus(mirror::Class::kStatusError, self); 4488 return false; 4489 } 4490 4491 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4492 StackHandleScope<1> hs(self); 4493 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4494 ObjectLock<mirror::Class> lock(self, new_class_h); 4495 4496 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4497 4498 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4499 CHECK(existing == nullptr || existing == klass.Get()); 4500 4501 // This will notify waiters on temp class that saw the not yet resolved class in the 4502 // class_table_ during EnsureResolved. 4503 klass->SetStatus(mirror::Class::kStatusRetired, self); 4504 4505 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4506 // This will notify waiters on new_class that saw the not yet resolved 4507 // class in the class_table_ during EnsureResolved. 4508 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4509 } 4510 return true; 4511} 4512 4513bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4514 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4515 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4516 uint16_t super_class_idx = class_def.superclass_idx_; 4517 if (super_class_idx != DexFile::kDexNoIndex16) { 4518 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4519 if (super_class == nullptr) { 4520 DCHECK(Thread::Current()->IsExceptionPending()); 4521 return false; 4522 } 4523 // Verify 4524 if (!klass->CanAccess(super_class)) { 4525 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4526 PrettyDescriptor(super_class).c_str(), 4527 PrettyDescriptor(klass.Get()).c_str()); 4528 return false; 4529 } 4530 CHECK(super_class->IsResolved()); 4531 klass->SetSuperClass(super_class); 4532 } 4533 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4534 if (interfaces != nullptr) { 4535 for (size_t i = 0; i < interfaces->Size(); i++) { 4536 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4537 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4538 if (interface == nullptr) { 4539 DCHECK(Thread::Current()->IsExceptionPending()); 4540 return false; 4541 } 4542 // Verify 4543 if (!klass->CanAccess(interface)) { 4544 // TODO: the RI seemed to ignore this in my testing. 4545 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4546 PrettyDescriptor(interface).c_str(), 4547 PrettyDescriptor(klass.Get()).c_str()); 4548 return false; 4549 } 4550 } 4551 } 4552 // Mark the class as loaded. 4553 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4554 return true; 4555} 4556 4557bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4558 CHECK(!klass->IsPrimitive()); 4559 mirror::Class* super = klass->GetSuperClass(); 4560 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4561 if (super != nullptr) { 4562 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4563 return false; 4564 } 4565 return true; 4566 } 4567 if (super == nullptr) { 4568 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4569 PrettyDescriptor(klass.Get()).c_str()); 4570 return false; 4571 } 4572 // Verify 4573 if (super->IsFinal() || super->IsInterface()) { 4574 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4575 PrettyDescriptor(super).c_str(), 4576 PrettyDescriptor(klass.Get()).c_str(), 4577 super->IsFinal() ? "declared final" : "an interface"); 4578 return false; 4579 } 4580 if (!klass->CanAccess(super)) { 4581 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4582 PrettyDescriptor(super).c_str(), 4583 PrettyDescriptor(klass.Get()).c_str()); 4584 return false; 4585 } 4586 4587 // Inherit kAccClassIsFinalizable from the superclass in case this 4588 // class doesn't override finalize. 4589 if (super->IsFinalizable()) { 4590 klass->SetFinalizable(); 4591 } 4592 4593 // Inherit reference flags (if any) from the superclass. 4594 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4595 if (reference_flags != 0) { 4596 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4597 } 4598 // Disallow custom direct subclasses of java.lang.ref.Reference. 4599 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4600 ThrowLinkageError(klass.Get(), 4601 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4602 PrettyDescriptor(klass.Get()).c_str()); 4603 return false; 4604 } 4605 4606 if (kIsDebugBuild) { 4607 // Ensure super classes are fully resolved prior to resolving fields.. 4608 while (super != nullptr) { 4609 CHECK(super->IsResolved()); 4610 super = super->GetSuperClass(); 4611 } 4612 } 4613 return true; 4614} 4615 4616// Populate the class vtable and itable. Compute return type indices. 4617bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4618 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4619 self->AllowThreadSuspension(); 4620 if (klass->IsInterface()) { 4621 // No vtable. 4622 size_t count = klass->NumVirtualMethods(); 4623 if (!IsUint(16, count)) { 4624 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4625 return false; 4626 } 4627 for (size_t i = 0; i < count; ++i) { 4628 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4629 } 4630 // Link interface method tables 4631 return LinkInterfaceMethods(klass, interfaces); 4632 } else { 4633 // Link virtual and interface method tables 4634 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4635 } 4636 return true; 4637} 4638 4639bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4640 if (klass->HasSuperClass()) { 4641 uint32_t max_count = klass->NumVirtualMethods() + 4642 klass->GetSuperClass()->GetVTableLength(); 4643 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4644 CHECK_LE(actual_count, max_count); 4645 StackHandleScope<4> hs(self); 4646 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4647 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4648 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4649 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4650 if (UNLIKELY(vtable.Get() == nullptr)) { 4651 CHECK(self->IsExceptionPending()); // OOME. 4652 return false; 4653 } 4654 int len = super_class->GetVTableLength(); 4655 for (int i = 0; i < len; i++) { 4656 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4657 } 4658 } else { 4659 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4660 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4661 if (UNLIKELY(vtable.Get() == nullptr)) { 4662 CHECK(self->IsExceptionPending()); // OOME. 4663 return false; 4664 } 4665 } 4666 4667 // See if any of our virtual methods override the superclass. 4668 MutableMethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4669 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4670 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4671 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4672 local_mh.ChangeMethod(local_method); 4673 size_t j = 0; 4674 for (; j < actual_count; ++j) { 4675 mirror::ArtMethod* super_method = vtable->Get(j); 4676 super_mh.ChangeMethod(super_method); 4677 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4678 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4679 super_method->GetAccessFlags())) { 4680 if (super_method->IsFinal()) { 4681 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4682 PrettyMethod(local_method).c_str(), 4683 super_method->GetDeclaringClassDescriptor()); 4684 return false; 4685 } 4686 vtable->Set<false>(j, local_method); 4687 local_method->SetMethodIndex(j); 4688 break; 4689 } else { 4690 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4691 << " would have incorrectly overridden the package-private method in " 4692 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4693 } 4694 } 4695 } 4696 if (j == actual_count) { 4697 // Not overriding, append. 4698 vtable->Set<false>(actual_count, local_method); 4699 local_method->SetMethodIndex(actual_count); 4700 actual_count += 1; 4701 } 4702 } 4703 if (!IsUint(16, actual_count)) { 4704 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4705 return false; 4706 } 4707 // Shrink vtable if possible 4708 CHECK_LE(actual_count, max_count); 4709 if (actual_count < max_count) { 4710 vtable.Assign(vtable->CopyOf(self, actual_count)); 4711 if (UNLIKELY(vtable.Get() == nullptr)) { 4712 CHECK(self->IsExceptionPending()); // OOME. 4713 return false; 4714 } 4715 } 4716 klass->SetVTable(vtable.Get()); 4717 } else { 4718 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4719 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4720 if (!IsUint(16, num_virtual_methods)) { 4721 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4722 return false; 4723 } 4724 StackHandleScope<1> hs(self); 4725 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4726 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4727 if (UNLIKELY(vtable.Get() == nullptr)) { 4728 CHECK(self->IsExceptionPending()); // OOME. 4729 return false; 4730 } 4731 for (size_t i = 0; i < num_virtual_methods; ++i) { 4732 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4733 vtable->Set<false>(i, virtual_method); 4734 virtual_method->SetMethodIndex(i & 0xFFFF); 4735 } 4736 klass->SetVTable(vtable.Get()); 4737 } 4738 return true; 4739} 4740 4741bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4742 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4743 Thread* const self = Thread::Current(); 4744 Runtime* const runtime = Runtime::Current(); 4745 // Set the imt table to be all conflicts by default. 4746 klass->SetImTable(runtime->GetDefaultImt()); 4747 size_t super_ifcount; 4748 if (klass->HasSuperClass()) { 4749 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4750 } else { 4751 super_ifcount = 0; 4752 } 4753 uint32_t num_interfaces = 4754 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4755 size_t ifcount = super_ifcount + num_interfaces; 4756 for (size_t i = 0; i < num_interfaces; i++) { 4757 mirror::Class* interface = 4758 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4759 interfaces->Get(i); 4760 ifcount += interface->GetIfTableCount(); 4761 } 4762 if (ifcount == 0) { 4763 // Class implements no interfaces. 4764 DCHECK_EQ(klass->GetIfTableCount(), 0); 4765 DCHECK(klass->GetIfTable() == nullptr); 4766 return true; 4767 } 4768 if (ifcount == super_ifcount) { 4769 // Class implements same interfaces as parent, are any of these not marker interfaces? 4770 bool has_non_marker_interface = false; 4771 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4772 for (size_t i = 0; i < ifcount; ++i) { 4773 if (super_iftable->GetMethodArrayCount(i) > 0) { 4774 has_non_marker_interface = true; 4775 break; 4776 } 4777 } 4778 if (!has_non_marker_interface) { 4779 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4780 klass->SetIfTable(super_iftable); 4781 return true; 4782 } 4783 } 4784 StackHandleScope<5> hs(self); 4785 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4786 if (UNLIKELY(iftable.Get() == nullptr)) { 4787 CHECK(self->IsExceptionPending()); // OOME. 4788 return false; 4789 } 4790 if (super_ifcount != 0) { 4791 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4792 for (size_t i = 0; i < super_ifcount; i++) { 4793 mirror::Class* super_interface = super_iftable->GetInterface(i); 4794 iftable->SetInterface(i, super_interface); 4795 } 4796 } 4797 self->AllowThreadSuspension(); 4798 // Flatten the interface inheritance hierarchy. 4799 size_t idx = super_ifcount; 4800 for (size_t i = 0; i < num_interfaces; i++) { 4801 mirror::Class* interface = 4802 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4803 interfaces->Get(i); 4804 DCHECK(interface != nullptr); 4805 if (!interface->IsInterface()) { 4806 std::string temp; 4807 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4808 PrettyDescriptor(klass.Get()).c_str(), 4809 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4810 return false; 4811 } 4812 // Check if interface is already in iftable 4813 bool duplicate = false; 4814 for (size_t j = 0; j < idx; j++) { 4815 mirror::Class* existing_interface = iftable->GetInterface(j); 4816 if (existing_interface == interface) { 4817 duplicate = true; 4818 break; 4819 } 4820 } 4821 if (!duplicate) { 4822 // Add this non-duplicate interface. 4823 iftable->SetInterface(idx++, interface); 4824 // Add this interface's non-duplicate super-interfaces. 4825 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4826 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4827 bool super_duplicate = false; 4828 for (size_t k = 0; k < idx; k++) { 4829 mirror::Class* existing_interface = iftable->GetInterface(k); 4830 if (existing_interface == super_interface) { 4831 super_duplicate = true; 4832 break; 4833 } 4834 } 4835 if (!super_duplicate) { 4836 iftable->SetInterface(idx++, super_interface); 4837 } 4838 } 4839 } 4840 } 4841 self->AllowThreadSuspension(); 4842 // Shrink iftable in case duplicates were found 4843 if (idx < ifcount) { 4844 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4845 if (UNLIKELY(iftable.Get() == nullptr)) { 4846 CHECK(self->IsExceptionPending()); // OOME. 4847 return false; 4848 } 4849 ifcount = idx; 4850 } else { 4851 CHECK_EQ(idx, ifcount); 4852 } 4853 klass->SetIfTable(iftable.Get()); 4854 4855 // If we're an interface, we don't need the vtable pointers, so we're done. 4856 if (klass->IsInterface()) { 4857 return true; 4858 } 4859 self->AllowThreadSuspension(); 4860 // Allocate imtable 4861 bool imtable_changed = false; 4862 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4863 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4864 if (UNLIKELY(imtable.Get() == nullptr)) { 4865 CHECK(self->IsExceptionPending()); // OOME. 4866 return false; 4867 } 4868 MutableMethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4869 MutableMethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4870 size_t max_miranda_methods = 0; // The max size of miranda_list. 4871 for (size_t i = 0; i < ifcount; ++i) { 4872 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4873 } 4874 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4875 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4876 size_t miranda_list_size = 0; // The current size of miranda_list. 4877 for (size_t i = 0; i < ifcount; ++i) { 4878 self->AllowThreadSuspension(); 4879 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4880 if (num_methods > 0) { 4881 StackHandleScope<2> hs(self); 4882 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4883 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4884 if (UNLIKELY(method_array.Get() == nullptr)) { 4885 CHECK(self->IsExceptionPending()); // OOME. 4886 return false; 4887 } 4888 iftable->SetMethodArray(i, method_array.Get()); 4889 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4890 hs.NewHandle(klass->GetVTableDuringLinking())); 4891 for (size_t j = 0; j < num_methods; ++j) { 4892 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4893 int32_t k; 4894 // For each method listed in the interface's method list, find the 4895 // matching method in our class's method list. We want to favor the 4896 // subclass over the superclass, which just requires walking 4897 // back from the end of the vtable. (This only matters if the 4898 // superclass defines a private method and this class redefines 4899 // it -- otherwise it would use the same vtable slot. In .dex files 4900 // those don't end up in the virtual method table, so it shouldn't 4901 // matter which direction we go. We walk it backward anyway.) 4902 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4903 vtable_mh.ChangeMethod(vtable->Get(k)); 4904 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4905 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4906 ThrowIllegalAccessError( 4907 klass.Get(), 4908 "Method '%s' implementing interface method '%s' is not public", 4909 PrettyMethod(vtable_mh.Get()).c_str(), 4910 PrettyMethod(interface_mh.Get()).c_str()); 4911 return false; 4912 } 4913 method_array->Set<false>(j, vtable_mh.Get()); 4914 // Place method in imt if entry is empty, place conflict otherwise. 4915 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4916 if (imtable->Get(imt_index) == nullptr) { 4917 imtable->Set<false>(imt_index, vtable_mh.Get()); 4918 imtable_changed = true; 4919 } else { 4920 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4921 } 4922 break; 4923 } 4924 } 4925 if (k < 0) { 4926 StackHandleScope<1> hs(self); 4927 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4928 for (size_t l = 0; l < miranda_list_size; ++l) { 4929 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4930 DCHECK(mir_method != nullptr); 4931 vtable_mh.ChangeMethod(mir_method); 4932 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4933 miranda_method.Assign(mir_method); 4934 break; 4935 } 4936 } 4937 if (miranda_method.Get() == nullptr) { 4938 // Point the interface table at a phantom slot. 4939 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4940 if (UNLIKELY(miranda_method.Get() == nullptr)) { 4941 CHECK(self->IsExceptionPending()); // OOME. 4942 return false; 4943 } 4944 DCHECK_LT(miranda_list_size, max_miranda_methods); 4945 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4946 } 4947 method_array->Set<false>(j, miranda_method.Get()); 4948 } 4949 } 4950 } 4951 } 4952 if (imtable_changed) { 4953 // Fill in empty entries in interface method table with conflict. 4954 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4955 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4956 if (imtable->Get(i) == nullptr) { 4957 imtable->Set<false>(i, imt_conflict_method); 4958 } 4959 } 4960 klass->SetImTable(imtable.Get()); 4961 } 4962 if (miranda_list_size > 0) { 4963 int old_method_count = klass->NumVirtualMethods(); 4964 int new_method_count = old_method_count + miranda_list_size; 4965 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4966 if (old_method_count == 0) { 4967 virtuals = AllocArtMethodArray(self, new_method_count); 4968 } else { 4969 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4970 } 4971 if (UNLIKELY(virtuals == nullptr)) { 4972 CHECK(self->IsExceptionPending()); // OOME. 4973 return false; 4974 } 4975 klass->SetVirtualMethods(virtuals); 4976 4977 StackHandleScope<1> hs(self); 4978 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4979 hs.NewHandle(klass->GetVTableDuringLinking())); 4980 CHECK(vtable.Get() != nullptr); 4981 int old_vtable_count = vtable->GetLength(); 4982 int new_vtable_count = old_vtable_count + miranda_list_size; 4983 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4984 if (UNLIKELY(vtable.Get() == nullptr)) { 4985 CHECK(self->IsExceptionPending()); // OOME. 4986 return false; 4987 } 4988 for (size_t i = 0; i < miranda_list_size; ++i) { 4989 mirror::ArtMethod* method = miranda_list->Get(i); 4990 // Leave the declaring class alone as type indices are relative to it 4991 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4992 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4993 klass->SetVirtualMethod(old_method_count + i, method); 4994 vtable->Set<false>(old_vtable_count + i, method); 4995 } 4996 // TODO: do not assign to the vtable field until it is fully constructed. 4997 klass->SetVTable(vtable.Get()); 4998 } 4999 5000 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 5001 for (int i = 0; i < vtable->GetLength(); ++i) { 5002 CHECK(vtable->Get(i) != nullptr); 5003 } 5004 5005 self->AllowThreadSuspension(); 5006 5007 return true; 5008} 5009 5010bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5011 CHECK(klass.Get() != nullptr); 5012 return LinkFields(self, klass, false, nullptr); 5013} 5014 5015bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5016 CHECK(klass.Get() != nullptr); 5017 return LinkFields(self, klass, true, class_size); 5018} 5019 5020struct LinkFieldsComparator { 5021 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5022 } 5023 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5024 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5025 NO_THREAD_SAFETY_ANALYSIS { 5026 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5027 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5028 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5029 if (type1 != type2) { 5030 bool is_primitive1 = type1 != Primitive::kPrimNot; 5031 bool is_primitive2 = type2 != Primitive::kPrimNot; 5032 if (type1 != type2) { 5033 if (is_primitive1 && is_primitive2) { 5034 // Larger primitive types go first. 5035 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5036 } else { 5037 // Reference always goes first. 5038 return !is_primitive1; 5039 } 5040 } 5041 } 5042 // same basic group? then sort by string. 5043 return strcmp(field1->GetName(), field2->GetName()) < 0; 5044 } 5045}; 5046 5047bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5048 size_t* class_size) { 5049 self->AllowThreadSuspension(); 5050 size_t num_fields = 5051 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5052 5053 mirror::ObjectArray<mirror::ArtField>* fields = 5054 is_static ? klass->GetSFields() : klass->GetIFields(); 5055 5056 // Initialize field_offset 5057 MemberOffset field_offset(0); 5058 if (is_static) { 5059 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5060 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5061 // Static fields come after the embedded tables. 5062 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5063 0, 0, 0, 0, 0); 5064 } 5065 field_offset = MemberOffset(base); 5066 } else { 5067 mirror::Class* super_class = klass->GetSuperClass(); 5068 if (super_class != nullptr) { 5069 CHECK(super_class->IsResolved()) 5070 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5071 field_offset = MemberOffset(super_class->GetObjectSize()); 5072 } 5073 } 5074 5075 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5076 5077 // we want a relatively stable order so that adding new fields 5078 // minimizes disruption of C++ version such as Class and Method. 5079 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5080 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5081 "Naked ArtField references in deque"); 5082 for (size_t i = 0; i < num_fields; i++) { 5083 mirror::ArtField* f = fields->Get(i); 5084 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5085 grouped_and_sorted_fields.push_back(f); 5086 } 5087 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5088 LinkFieldsComparator()); 5089 5090 // References should be at the front. 5091 size_t current_field = 0; 5092 size_t num_reference_fields = 0; 5093 FieldGaps gaps; 5094 5095 for (; current_field < num_fields; current_field++) { 5096 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5097 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5098 bool isPrimitive = type != Primitive::kPrimNot; 5099 if (isPrimitive) { 5100 break; // past last reference, move on to the next phase 5101 } 5102 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5103 MemberOffset old_offset = field_offset; 5104 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5105 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5106 } 5107 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5108 grouped_and_sorted_fields.pop_front(); 5109 num_reference_fields++; 5110 fields->Set<false>(current_field, field); 5111 field->SetOffset(field_offset); 5112 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5113 } 5114 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5115 // otherwise we could end up with suboptimal gap fills. 5116 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5117 fields, &grouped_and_sorted_fields, &gaps); 5118 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5119 fields, &grouped_and_sorted_fields, &gaps); 5120 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5121 fields, &grouped_and_sorted_fields, &gaps); 5122 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5123 fields, &grouped_and_sorted_fields, &gaps); 5124 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5125 " fields."; 5126 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5127 5128 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5129 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5130 // We know there are no non-reference fields in the Reference classes, and we know 5131 // that 'referent' is alphabetically last, so this is easy... 5132 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5133 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5134 --num_reference_fields; 5135 } 5136 5137 if (kIsDebugBuild) { 5138 // Make sure that all reference fields appear before 5139 // non-reference fields, and all double-wide fields are aligned. 5140 bool seen_non_ref = false; 5141 for (size_t i = 0; i < num_fields; i++) { 5142 mirror::ArtField* field = fields->Get(i); 5143 if (false) { // enable to debug field layout 5144 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5145 << " class=" << PrettyClass(klass.Get()) 5146 << " field=" << PrettyField(field) 5147 << " offset=" 5148 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5149 } 5150 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5151 bool is_primitive = type != Primitive::kPrimNot; 5152 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5153 strcmp("referent", field->GetName()) == 0) { 5154 is_primitive = true; // We lied above, so we have to expect a lie here. 5155 } 5156 if (is_primitive) { 5157 if (!seen_non_ref) { 5158 seen_non_ref = true; 5159 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5160 } 5161 } else { 5162 DCHECK(!seen_non_ref) << PrettyField(field); 5163 } 5164 } 5165 if (!seen_non_ref) { 5166 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5167 } 5168 } 5169 5170 size_t size = field_offset.Uint32Value(); 5171 // Update klass 5172 if (is_static) { 5173 klass->SetNumReferenceStaticFields(num_reference_fields); 5174 *class_size = size; 5175 } else { 5176 klass->SetNumReferenceInstanceFields(num_reference_fields); 5177 if (!klass->IsVariableSize()) { 5178 std::string temp; 5179 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5180 size_t previous_size = klass->GetObjectSize(); 5181 if (previous_size != 0) { 5182 // Make sure that we didn't originally have an incorrect size. 5183 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5184 } 5185 klass->SetObjectSize(size); 5186 } 5187 } 5188 return true; 5189} 5190 5191// Set the bitmap of reference offsets, refOffsets, from the ifields 5192// list. 5193void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5194 uint32_t reference_offsets = 0; 5195 mirror::Class* super_class = klass->GetSuperClass(); 5196 if (super_class != nullptr) { 5197 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5198 // If our superclass overflowed, we don't stand a chance. 5199 if (reference_offsets == CLASS_WALK_SUPER) { 5200 klass->SetReferenceInstanceOffsets(reference_offsets); 5201 return; 5202 } 5203 } 5204 CreateReferenceOffsets(klass, reference_offsets); 5205} 5206 5207void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, 5208 uint32_t reference_offsets) { 5209 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5210 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5211 // All of the fields that contain object references are guaranteed 5212 // to be at the beginning of the fields list. 5213 for (size_t i = 0; i < num_reference_fields; ++i) { 5214 // Note that byte_offset is the offset from the beginning of 5215 // object, not the offset into instance data 5216 mirror::ArtField* field = fields->Get(i); 5217 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5218 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5219 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5220 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5221 CHECK_NE(new_bit, 0U); 5222 reference_offsets |= new_bit; 5223 } else { 5224 reference_offsets = CLASS_WALK_SUPER; 5225 break; 5226 } 5227 } 5228 klass->SetReferenceInstanceOffsets(reference_offsets); 5229} 5230 5231mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5232 Handle<mirror::DexCache> dex_cache) { 5233 DCHECK(dex_cache.Get() != nullptr); 5234 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5235 if (resolved != nullptr) { 5236 return resolved; 5237 } 5238 uint32_t utf16_length; 5239 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5240 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5241 dex_cache->SetResolvedString(string_idx, string); 5242 return string; 5243} 5244 5245mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5246 mirror::Class* referrer) { 5247 StackHandleScope<2> hs(Thread::Current()); 5248 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5249 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5250 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5251} 5252 5253mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5254 Handle<mirror::DexCache> dex_cache, 5255 Handle<mirror::ClassLoader> class_loader) { 5256 DCHECK(dex_cache.Get() != nullptr); 5257 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5258 if (resolved == nullptr) { 5259 Thread* self = Thread::Current(); 5260 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5261 resolved = FindClass(self, descriptor, class_loader); 5262 if (resolved != nullptr) { 5263 // TODO: we used to throw here if resolved's class loader was not the 5264 // boot class loader. This was to permit different classes with the 5265 // same name to be loaded simultaneously by different loaders 5266 dex_cache->SetResolvedType(type_idx, resolved); 5267 } else { 5268 CHECK(self->IsExceptionPending()) 5269 << "Expected pending exception for failed resolution of: " << descriptor; 5270 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5271 StackHandleScope<1> hs(self); 5272 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5273 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5274 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5275 self->ClearException(); 5276 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5277 self->GetException(nullptr)->SetCause(cause.Get()); 5278 } 5279 } 5280 } 5281 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5282 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5283 return resolved; 5284} 5285 5286mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5287 Handle<mirror::DexCache> dex_cache, 5288 Handle<mirror::ClassLoader> class_loader, 5289 Handle<mirror::ArtMethod> referrer, 5290 InvokeType type) { 5291 DCHECK(dex_cache.Get() != nullptr); 5292 // Check for hit in the dex cache. 5293 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5294 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5295 return resolved; 5296 } 5297 // Fail, get the declaring class. 5298 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5299 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5300 if (klass == nullptr) { 5301 DCHECK(Thread::Current()->IsExceptionPending()); 5302 return nullptr; 5303 } 5304 // Scan using method_idx, this saves string compares but will only hit for matching dex 5305 // caches/files. 5306 switch (type) { 5307 case kDirect: // Fall-through. 5308 case kStatic: 5309 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5310 break; 5311 case kInterface: 5312 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5313 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5314 break; 5315 case kSuper: // Fall-through. 5316 case kVirtual: 5317 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5318 break; 5319 default: 5320 LOG(FATAL) << "Unreachable - invocation type: " << type; 5321 } 5322 if (resolved == nullptr) { 5323 // Search by name, which works across dex files. 5324 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5325 const Signature signature = dex_file.GetMethodSignature(method_id); 5326 switch (type) { 5327 case kDirect: // Fall-through. 5328 case kStatic: 5329 resolved = klass->FindDirectMethod(name, signature); 5330 break; 5331 case kInterface: 5332 resolved = klass->FindInterfaceMethod(name, signature); 5333 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5334 break; 5335 case kSuper: // Fall-through. 5336 case kVirtual: 5337 resolved = klass->FindVirtualMethod(name, signature); 5338 break; 5339 } 5340 } 5341 // If we found a method, check for incompatible class changes. 5342 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5343 // Be a good citizen and update the dex cache to speed subsequent calls. 5344 dex_cache->SetResolvedMethod(method_idx, resolved); 5345 return resolved; 5346 } else { 5347 // If we had a method, it's an incompatible-class-change error. 5348 if (resolved != nullptr) { 5349 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5350 } else { 5351 // We failed to find the method which means either an access error, an incompatible class 5352 // change, or no such method. First try to find the method among direct and virtual methods. 5353 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5354 const Signature signature = dex_file.GetMethodSignature(method_id); 5355 switch (type) { 5356 case kDirect: 5357 case kStatic: 5358 resolved = klass->FindVirtualMethod(name, signature); 5359 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5360 // have had a resolved method before, which triggers the "true" branch above. 5361 break; 5362 case kInterface: 5363 case kVirtual: 5364 case kSuper: 5365 resolved = klass->FindDirectMethod(name, signature); 5366 break; 5367 } 5368 5369 // If we found something, check that it can be accessed by the referrer. 5370 if (resolved != nullptr && referrer.Get() != nullptr) { 5371 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5372 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5373 if (!referring_class->CanAccess(methods_class)) { 5374 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5375 resolved, type); 5376 return nullptr; 5377 } else if (!referring_class->CanAccessMember(methods_class, 5378 resolved->GetAccessFlags())) { 5379 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5380 return nullptr; 5381 } 5382 } 5383 5384 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5385 // methods and throw if we find the method there. If we find nothing, throw a 5386 // NoSuchMethodError. 5387 switch (type) { 5388 case kDirect: 5389 case kStatic: 5390 if (resolved != nullptr) { 5391 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5392 } else { 5393 resolved = klass->FindInterfaceMethod(name, signature); 5394 if (resolved != nullptr) { 5395 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5396 } else { 5397 ThrowNoSuchMethodError(type, klass, name, signature); 5398 } 5399 } 5400 break; 5401 case kInterface: 5402 if (resolved != nullptr) { 5403 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5404 } else { 5405 resolved = klass->FindVirtualMethod(name, signature); 5406 if (resolved != nullptr) { 5407 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5408 } else { 5409 ThrowNoSuchMethodError(type, klass, name, signature); 5410 } 5411 } 5412 break; 5413 case kSuper: 5414 if (resolved != nullptr) { 5415 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5416 } else { 5417 ThrowNoSuchMethodError(type, klass, name, signature); 5418 } 5419 break; 5420 case kVirtual: 5421 if (resolved != nullptr) { 5422 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5423 } else { 5424 resolved = klass->FindInterfaceMethod(name, signature); 5425 if (resolved != nullptr) { 5426 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5427 } else { 5428 ThrowNoSuchMethodError(type, klass, name, signature); 5429 } 5430 } 5431 break; 5432 } 5433 } 5434 DCHECK(Thread::Current()->IsExceptionPending()); 5435 return nullptr; 5436 } 5437} 5438 5439mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5440 Handle<mirror::DexCache> dex_cache, 5441 Handle<mirror::ClassLoader> class_loader, 5442 bool is_static) { 5443 DCHECK(dex_cache.Get() != nullptr); 5444 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5445 if (resolved != nullptr) { 5446 return resolved; 5447 } 5448 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5449 Thread* const self = Thread::Current(); 5450 StackHandleScope<1> hs(self); 5451 Handle<mirror::Class> klass( 5452 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5453 if (klass.Get() == nullptr) { 5454 DCHECK(Thread::Current()->IsExceptionPending()); 5455 return nullptr; 5456 } 5457 5458 if (is_static) { 5459 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5460 } else { 5461 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5462 } 5463 5464 if (resolved == nullptr) { 5465 const char* name = dex_file.GetFieldName(field_id); 5466 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5467 if (is_static) { 5468 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5469 } else { 5470 resolved = klass->FindInstanceField(name, type); 5471 } 5472 if (resolved == nullptr) { 5473 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5474 return nullptr; 5475 } 5476 } 5477 dex_cache->SetResolvedField(field_idx, resolved); 5478 return resolved; 5479} 5480 5481mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5482 uint32_t field_idx, 5483 Handle<mirror::DexCache> dex_cache, 5484 Handle<mirror::ClassLoader> class_loader) { 5485 DCHECK(dex_cache.Get() != nullptr); 5486 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5487 if (resolved != nullptr) { 5488 return resolved; 5489 } 5490 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5491 Thread* self = Thread::Current(); 5492 StackHandleScope<1> hs(self); 5493 Handle<mirror::Class> klass( 5494 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5495 if (klass.Get() == nullptr) { 5496 DCHECK(Thread::Current()->IsExceptionPending()); 5497 return nullptr; 5498 } 5499 5500 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5501 StringPiece type(dex_file.StringDataByIdx( 5502 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5503 resolved = mirror::Class::FindField(self, klass, name, type); 5504 if (resolved != nullptr) { 5505 dex_cache->SetResolvedField(field_idx, resolved); 5506 } else { 5507 ThrowNoSuchFieldError("", klass.Get(), type, name); 5508 } 5509 return resolved; 5510} 5511 5512const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5513 uint32_t* length) { 5514 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5515 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5516 const DexFile& dex_file = *dex_cache->GetDexFile(); 5517 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5518 return dex_file.GetMethodShorty(method_id, length); 5519} 5520 5521void ClassLinker::DumpAllClasses(int flags) { 5522 if (dex_cache_image_class_lookup_required_) { 5523 MoveImageClassesToClassTable(); 5524 } 5525 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5526 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5527 std::vector<mirror::Class*> all_classes; 5528 { 5529 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5530 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5531 mirror::Class* klass = it.second.Read(); 5532 all_classes.push_back(klass); 5533 } 5534 } 5535 5536 for (size_t i = 0; i < all_classes.size(); ++i) { 5537 all_classes[i]->DumpClass(std::cerr, flags); 5538 } 5539} 5540 5541void ClassLinker::DumpForSigQuit(std::ostream& os) { 5542 Thread* self = Thread::Current(); 5543 if (dex_cache_image_class_lookup_required_) { 5544 ScopedObjectAccess soa(self); 5545 MoveImageClassesToClassTable(); 5546 } 5547 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5548 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5549} 5550 5551size_t ClassLinker::NumLoadedClasses() { 5552 if (dex_cache_image_class_lookup_required_) { 5553 MoveImageClassesToClassTable(); 5554 } 5555 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5556 return class_table_.size(); 5557} 5558 5559pid_t ClassLinker::GetClassesLockOwner() { 5560 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5561} 5562 5563pid_t ClassLinker::GetDexLockOwner() { 5564 return dex_lock_.GetExclusiveOwnerTid(); 5565} 5566 5567void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5568 DCHECK(!init_done_); 5569 5570 DCHECK(klass != nullptr); 5571 DCHECK(klass->GetClassLoader() == nullptr); 5572 5573 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5574 DCHECK(class_roots != nullptr); 5575 DCHECK(class_roots->Get(class_root) == nullptr); 5576 class_roots->Set<false>(class_root, klass); 5577} 5578 5579} // namespace art 5580