class_linker.cc revision 2c4257be8191c5eefde744e8965fcefc80a0a97d
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <iostream> 21#include <memory> 22#include <queue> 23#include <string> 24#include <utility> 25#include <vector> 26 27#include "base/casts.h" 28#include "base/logging.h" 29#include "base/scoped_flock.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "entrypoints/runtime_asm_entrypoints.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread-inl.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 Runtime* runtime = Runtime::Current(); 95 bool is_compiler = runtime->IsCompiler(); 96 if (!is_compiler) { // Give info if this occurs at runtime. 97 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 98 } 99 100 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 101 Thread* self = Thread::Current(); 102 if (is_compiler) { 103 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 104 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 105 self->SetException(ThrowLocation(), pre_allocated); 106 } else { 107 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 108 if (c->GetVerifyErrorClass() != NULL) { 109 // TODO: change the verifier to store an _instance_, with a useful detail message? 110 std::string temp; 111 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 112 PrettyDescriptor(c).c_str()); 113 } else { 114 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 115 PrettyDescriptor(c).c_str()); 116 } 117 } 118} 119 120static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 121 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 122 if (VLOG_IS_ON(class_linker)) { 123 std::string temp; 124 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 125 << klass->GetLocation() << "\n" << Thread::Current()->GetException(nullptr)->Dump(); 126 } 127} 128 129static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 130 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 131 Thread* self = Thread::Current(); 132 JNIEnv* env = self->GetJniEnv(); 133 134 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 135 CHECK(cause.get() != nullptr); 136 137 env->ExceptionClear(); 138 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 139 env->Throw(cause.get()); 140 141 // We only wrap non-Error exceptions; an Error can just be used as-is. 142 if (!is_error) { 143 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 144 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 145 nullptr); 146 } 147 VlogClassInitializationFailure(klass); 148} 149 150static size_t Hash(const char* s) { 151 // This is the java.lang.String hashcode for convenience, not interoperability. 152 size_t hash = 0; 153 for (; *s != '\0'; ++s) { 154 hash = hash * 31 + *s; 155 } 156 return hash; 157} 158 159// Gap between two fields in object layout. 160struct FieldGap { 161 uint32_t start_offset; // The offset from the start of the object. 162 uint32_t size; // The gap size of 1, 2, or 4 bytes. 163}; 164struct FieldGapsComparator { 165 explicit FieldGapsComparator() { 166 } 167 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 168 NO_THREAD_SAFETY_ANALYSIS { 169 // Sort by gap size, largest first. 170 return lhs.size > rhs.size; 171 } 172}; 173typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 174 175// Adds largest aligned gaps to queue of gaps. 176void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 177 DCHECK(gaps != nullptr); 178 179 uint32_t current_offset = gap_start; 180 while (current_offset != gap_end) { 181 size_t remaining = gap_end - current_offset; 182 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 183 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 184 current_offset += sizeof(uint32_t); 185 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 186 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 187 current_offset += sizeof(uint16_t); 188 } else { 189 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 190 current_offset += sizeof(uint8_t); 191 } 192 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 193 } 194} 195// Shuffle fields forward, making use of gaps whenever possible. 196template<int n> 197static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 198 MemberOffset* field_offset, 199 mirror::ObjectArray<mirror::ArtField>* fields, 200 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 201 FieldGaps* gaps) 202 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 203 DCHECK(current_field_idx != nullptr); 204 DCHECK(grouped_and_sorted_fields != nullptr); 205 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 206 DCHECK(gaps != nullptr); 207 DCHECK(field_offset != nullptr); 208 209 DCHECK(IsPowerOfTwo(n)); 210 while (!grouped_and_sorted_fields->empty()) { 211 mirror::ArtField* field = grouped_and_sorted_fields->front(); 212 Primitive::Type type = field->GetTypeAsPrimitiveType(); 213 if (Primitive::ComponentSize(type) < n) { 214 break; 215 } 216 if (!IsAligned<n>(field_offset->Uint32Value())) { 217 MemberOffset old_offset = *field_offset; 218 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 219 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 220 } 221 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 222 grouped_and_sorted_fields->pop_front(); 223 fields->Set<false>(*current_field_idx, field); 224 if (!gaps->empty() && gaps->top().size >= n) { 225 FieldGap gap = gaps->top(); 226 gaps->pop(); 227 DCHECK(IsAligned<n>(gap.start_offset)); 228 field->SetOffset(MemberOffset(gap.start_offset)); 229 if (gap.size > n) { 230 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 231 } 232 } else { 233 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 234 field->SetOffset(*field_offset); 235 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 236 } 237 ++(*current_field_idx); 238 } 239} 240 241ClassLinker::ClassLinker(InternTable* intern_table) 242 // dex_lock_ is recursive as it may be used in stack dumping. 243 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 244 dex_cache_image_class_lookup_required_(false), 245 failed_dex_cache_class_lookups_(0), 246 class_roots_(nullptr), 247 array_iftable_(nullptr), 248 find_array_class_cache_next_victim_(0), 249 init_done_(false), 250 log_new_dex_caches_roots_(false), 251 log_new_class_table_roots_(false), 252 intern_table_(intern_table), 253 portable_resolution_trampoline_(nullptr), 254 quick_resolution_trampoline_(nullptr), 255 portable_imt_conflict_trampoline_(nullptr), 256 quick_imt_conflict_trampoline_(nullptr), 257 quick_generic_jni_trampoline_(nullptr), 258 quick_to_interpreter_bridge_trampoline_(nullptr) { 259 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 260} 261 262void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 263 VLOG(startup) << "ClassLinker::Init"; 264 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 265 266 CHECK(!init_done_); 267 268 // java_lang_Class comes first, it's needed for AllocClass 269 Thread* self = Thread::Current(); 270 gc::Heap* heap = Runtime::Current()->GetHeap(); 271 // The GC can't handle an object with a null class since we can't get the size of this object. 272 heap->IncrementDisableMovingGC(self); 273 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 274 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 275 heap->AllocNonMovableObject<true>(self, nullptr, 276 mirror::Class::ClassClassSize(), 277 VoidFunctor())))); 278 CHECK(java_lang_Class.Get() != nullptr); 279 mirror::Class::SetClassClass(java_lang_Class.Get()); 280 java_lang_Class->SetClass(java_lang_Class.Get()); 281 if (kUseBakerOrBrooksReadBarrier) { 282 java_lang_Class->AssertReadBarrierPointer(); 283 } 284 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 285 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 286 heap->DecrementDisableMovingGC(self); 287 // AllocClass(mirror::Class*) can now be used 288 289 // Class[] is used for reflection support. 290 Handle<mirror::Class> class_array_class(hs.NewHandle( 291 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 292 class_array_class->SetComponentType(java_lang_Class.Get()); 293 294 // java_lang_Object comes next so that object_array_class can be created. 295 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 297 CHECK(java_lang_Object.Get() != nullptr); 298 // backfill Object as the super class of Class. 299 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 300 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 301 302 // Object[] next to hold class roots. 303 Handle<mirror::Class> object_array_class(hs.NewHandle( 304 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 305 object_array_class->SetComponentType(java_lang_Object.Get()); 306 307 // Setup the char (primitive) class to be used for char[]. 308 Handle<mirror::Class> char_class(hs.NewHandle( 309 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 310 // The primitive char class won't be initialized by 311 // InitializePrimitiveClass until line 459, but strings (and 312 // internal char arrays) will be allocated before that and the 313 // component size, which is computed from the primitive type, needs 314 // to be set here. 315 char_class->SetPrimitiveType(Primitive::kPrimChar); 316 317 // Setup the char[] class to be used for String. 318 Handle<mirror::Class> char_array_class(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), 320 mirror::Array::ClassSize()))); 321 char_array_class->SetComponentType(char_class.Get()); 322 mirror::CharArray::SetArrayClass(char_array_class.Get()); 323 324 // Setup String. 325 Handle<mirror::Class> java_lang_String(hs.NewHandle( 326 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 327 mirror::String::SetClass(java_lang_String.Get()); 328 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 329 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 330 331 // Setup Reference. 332 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 333 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 334 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 335 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 336 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 337 338 // Create storage for root classes, save away our work so far (requires descriptors). 339 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 340 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 341 kClassRootsMax)); 342 CHECK(!class_roots_.IsNull()); 343 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 344 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 345 SetClassRoot(kClassArrayClass, class_array_class.Get()); 346 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 347 SetClassRoot(kCharArrayClass, char_array_class.Get()); 348 SetClassRoot(kJavaLangString, java_lang_String.Get()); 349 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 350 351 // Setup the primitive type classes. 352 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 353 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 354 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 355 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 356 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 357 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 358 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 359 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 360 361 // Create array interface entries to populate once we can load system classes. 362 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 363 364 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 365 Handle<mirror::Class> int_array_class(hs.NewHandle( 366 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 367 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 368 mirror::IntArray::SetArrayClass(int_array_class.Get()); 369 SetClassRoot(kIntArrayClass, int_array_class.Get()); 370 371 // now that these are registered, we can use AllocClass() and AllocObjectArray 372 373 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 374 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 375 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 376 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 377 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 378 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 379 380 // Constructor, Field, Method, and AbstractMethod are necessary so 381 // that FindClass can link members. 382 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 383 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 384 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 385 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 386 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 387 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 388 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 389 390 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 392 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 393 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 394 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 395 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 396 397 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 398 399 // Set up array classes for string, field, method 400 Handle<mirror::Class> object_array_string(hs.NewHandle( 401 AllocClass(self, java_lang_Class.Get(), 402 mirror::ObjectArray<mirror::String>::ClassSize()))); 403 object_array_string->SetComponentType(java_lang_String.Get()); 404 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 405 406 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), 408 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 409 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 410 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 411 412 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 413 AllocClass(self, java_lang_Class.Get(), 414 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 415 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 416 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 417 418 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 419 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 420 // these roots. 421 CHECK_NE(0U, boot_class_path.size()); 422 for (size_t i = 0; i != boot_class_path.size(); ++i) { 423 const DexFile* dex_file = boot_class_path[i]; 424 CHECK(dex_file != nullptr); 425 AppendToBootClassPath(self, *dex_file); 426 } 427 428 // now we can use FindSystemClass 429 430 // run char class through InitializePrimitiveClass to finish init 431 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 432 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 433 434 // Create runtime resolution and imt conflict methods. Also setup the default imt. 435 Runtime* runtime = Runtime::Current(); 436 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 437 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 438 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 439 440 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 441 // we do not need friend classes or a publicly exposed setter. 442 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 443 if (!runtime->IsCompiler()) { 444 // We need to set up the generic trampolines since we don't have an image. 445 quick_resolution_trampoline_ = GetQuickResolutionStub(); 446 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 447 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 448 } 449 450 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 451 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 452 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 453 CHECK_EQ(java_lang_Object.Get(), Object_class); 454 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 455 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 456 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 457 std::ostringstream os1, os2; 458 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 459 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 460 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 461 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 462 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 464 CHECK_EQ(java_lang_String.Get(), String_class); 465 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 466 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 467 468 // Setup the primitive array type classes - can't be done until Object has a vtable. 469 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 470 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 471 472 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 473 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 474 475 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 476 CHECK_EQ(char_array_class.Get(), found_char_array_class); 477 478 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 479 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 480 481 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 482 CHECK_EQ(int_array_class.Get(), found_int_array_class); 483 484 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 485 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 486 487 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 488 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 489 490 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 491 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 492 493 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 494 CHECK_EQ(class_array_class.Get(), found_class_array_class); 495 496 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 497 CHECK_EQ(object_array_class.Get(), found_object_array_class); 498 499 // Setup the single, global copy of "iftable". 500 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 501 CHECK(java_lang_Cloneable != nullptr); 502 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 503 CHECK(java_io_Serializable != nullptr); 504 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 505 // crawl up and explicitly list all of the supers as well. 506 { 507 mirror::IfTable* array_iftable = array_iftable_.Read(); 508 array_iftable->SetInterface(0, java_lang_Cloneable); 509 array_iftable->SetInterface(1, java_io_Serializable); 510 } 511 512 // Sanity check Class[] and Object[]'s interfaces. 513 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 514 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 515 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 516 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 517 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 518 // dex_cache_ fields and register them in class_table_. 519 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 520 CHECK_EQ(java_lang_Class.Get(), Class_class); 521 522 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 523 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 524 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 525 526 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 527 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 528 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 529 530 mirror::Class* String_array_class = 531 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 532 CHECK_EQ(object_array_string.Get(), String_array_class); 533 534 mirror::Class* Art_method_array_class = 535 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 536 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 537 538 mirror::Class* Art_field_array_class = 539 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 540 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 541 542 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 543 544 // Create java.lang.reflect.Proxy root. 545 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 546 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 547 548 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 549 // finish initializing Reference class 550 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 551 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 552 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 553 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 554 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 555 mirror::Class* java_lang_ref_FinalizerReference = 556 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 557 java_lang_ref_FinalizerReference->SetAccessFlags( 558 java_lang_ref_FinalizerReference->GetAccessFlags() | 559 kAccClassIsReference | kAccClassIsFinalizerReference); 560 mirror::Class* java_lang_ref_PhantomReference = 561 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 562 java_lang_ref_PhantomReference->SetAccessFlags( 563 java_lang_ref_PhantomReference->GetAccessFlags() | 564 kAccClassIsReference | kAccClassIsPhantomReference); 565 mirror::Class* java_lang_ref_SoftReference = 566 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 567 java_lang_ref_SoftReference->SetAccessFlags( 568 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 569 mirror::Class* java_lang_ref_WeakReference = 570 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 571 java_lang_ref_WeakReference->SetAccessFlags( 572 java_lang_ref_WeakReference->GetAccessFlags() | 573 kAccClassIsReference | kAccClassIsWeakReference); 574 575 // Setup the ClassLoader, verifying the object_size_. 576 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 577 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 578 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 579 580 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 581 // java.lang.StackTraceElement as a convenience. 582 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 583 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 584 SetClassRoot(kJavaLangClassNotFoundException, 585 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 586 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 587 SetClassRoot(kJavaLangStackTraceElementArrayClass, 588 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 589 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 590 591 FinishInit(self); 592 593 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 594} 595 596void ClassLinker::FinishInit(Thread* self) { 597 VLOG(startup) << "ClassLinker::FinishInit entering"; 598 599 // Let the heap know some key offsets into java.lang.ref instances 600 // Note: we hard code the field indexes here rather than using FindInstanceField 601 // as the types of the field can't be resolved prior to the runtime being 602 // fully initialized 603 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 604 mirror::Class* java_lang_ref_FinalizerReference = 605 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 606 607 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 608 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 609 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 610 611 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 612 CHECK_STREQ(queue->GetName(), "queue"); 613 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 614 615 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 616 CHECK_STREQ(queueNext->GetName(), "queueNext"); 617 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 618 619 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 620 CHECK_STREQ(referent->GetName(), "referent"); 621 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 622 623 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 624 CHECK_STREQ(zombie->GetName(), "zombie"); 625 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 626 627 // ensure all class_roots_ are initialized 628 for (size_t i = 0; i < kClassRootsMax; i++) { 629 ClassRoot class_root = static_cast<ClassRoot>(i); 630 mirror::Class* klass = GetClassRoot(class_root); 631 CHECK(klass != nullptr); 632 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 633 // note SetClassRoot does additional validation. 634 // if possible add new checks there to catch errors early 635 } 636 637 CHECK(!array_iftable_.IsNull()); 638 639 // disable the slow paths in FindClass and CreatePrimitiveClass now 640 // that Object, Class, and Object[] are setup 641 init_done_ = true; 642 643 VLOG(startup) << "ClassLinker::FinishInit exiting"; 644} 645 646void ClassLinker::RunRootClinits() { 647 Thread* self = Thread::Current(); 648 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 649 mirror::Class* c = GetClassRoot(ClassRoot(i)); 650 if (!c->IsArrayClass() && !c->IsPrimitive()) { 651 StackHandleScope<1> hs(self); 652 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 653 EnsureInitialized(self, h_class, true, true); 654 self->AssertNoPendingException(); 655 } 656 } 657} 658 659bool ClassLinker::GenerateOatFile(const char* dex_filename, 660 int oat_fd, 661 const char* oat_cache_filename, 662 std::string* error_msg) { 663 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 664 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 665 666 gc::Heap* heap = Runtime::Current()->GetHeap(); 667 std::string boot_image_option("--boot-image="); 668 if (heap->GetImageSpace() == nullptr) { 669 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 670 // out of space anyway it might not matter. 671 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 672 "without an image.", dex_filename); 673 return false; 674 } 675 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 676 677 std::string dex_file_option("--dex-file="); 678 dex_file_option += dex_filename; 679 680 std::string oat_fd_option("--oat-fd="); 681 StringAppendF(&oat_fd_option, "%d", oat_fd); 682 683 std::string oat_location_option("--oat-location="); 684 oat_location_option += oat_cache_filename; 685 686 std::vector<std::string> argv; 687 argv.push_back(dex2oat); 688 argv.push_back("--runtime-arg"); 689 argv.push_back("-classpath"); 690 argv.push_back("--runtime-arg"); 691 argv.push_back(Runtime::Current()->GetClassPathString()); 692 693 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 694 695 if (!Runtime::Current()->IsVerificationEnabled()) { 696 argv.push_back("--compiler-filter=verify-none"); 697 } 698 699 if (Runtime::Current()->MustRelocateIfPossible()) { 700 argv.push_back("--runtime-arg"); 701 argv.push_back("-Xrelocate"); 702 } else { 703 argv.push_back("--runtime-arg"); 704 argv.push_back("-Xnorelocate"); 705 } 706 707 if (!kIsTargetBuild) { 708 argv.push_back("--host"); 709 } 710 711 argv.push_back(boot_image_option); 712 argv.push_back(dex_file_option); 713 argv.push_back(oat_fd_option); 714 argv.push_back(oat_location_option); 715 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 716 for (size_t i = 0; i < compiler_options.size(); ++i) { 717 argv.push_back(compiler_options[i].c_str()); 718 } 719 720 return Exec(argv, error_msg); 721} 722 723const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 724 WriterMutexLock mu(Thread::Current(), dex_lock_); 725 if (kIsDebugBuild) { 726 for (size_t i = 0; i < oat_files_.size(); ++i) { 727 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 728 } 729 } 730 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 731 oat_files_.push_back(oat_file); 732 return oat_file; 733} 734 735OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 736 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 737 OatFile* oat_file = space->ReleaseOatFile(); 738 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 739 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 740 return *oat_file; 741} 742 743const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 744 const char* dex_location = dex_file.GetLocation().c_str(); 745 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 746 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 747} 748 749const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 750 const char* dex_location, 751 const uint32_t* dex_location_checksum) { 752 ReaderMutexLock mu(Thread::Current(), dex_lock_); 753 for (const OatFile* oat_file : oat_files_) { 754 DCHECK(oat_file != nullptr); 755 756 if (oat_location != nullptr) { 757 if (oat_file->GetLocation() != oat_location) { 758 continue; 759 } 760 } 761 762 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 763 dex_location_checksum, 764 false); 765 if (oat_dex_file != nullptr) { 766 return oat_dex_file; 767 } 768 } 769 return nullptr; 770} 771 772 773// Loads all multi dex files from the given oat file returning true on success. 774// 775// Parameters: 776// oat_file - the oat file to load from 777// dex_location - the dex location used to generate the oat file 778// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 779// generated - whether or not the oat_file existed before or was just (re)generated 780// error_msgs - any error messages will be appended here 781// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 782static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 783 const char* dex_location, 784 const uint32_t* dex_location_checksum, 785 bool generated, 786 std::vector<std::string>* error_msgs, 787 std::vector<const DexFile*>* dex_files) { 788 if (oat_file == nullptr) { 789 return false; 790 } 791 792 size_t old_size = dex_files->size(); // To rollback on error. 793 794 bool success = true; 795 for (size_t i = 0; success; ++i) { 796 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 797 const char* next_name = next_name_str.c_str(); 798 799 uint32_t next_location_checksum; 800 uint32_t* next_location_checksum_pointer = &next_location_checksum; 801 std::string error_msg; 802 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 803 // When i=0 the multidex name should be the same as the location name. We already have the 804 // checksum it so we don't need to recompute it. 805 if (dex_location_checksum == nullptr) { 806 next_location_checksum_pointer = nullptr; 807 } else { 808 next_location_checksum = *dex_location_checksum; 809 } 810 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 811 DCHECK_EQ(false, i == 0 && generated); 812 next_location_checksum_pointer = nullptr; 813 } 814 815 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 816 817 if (oat_dex_file == nullptr) { 818 if (i == 0 && generated) { 819 std::string error_msg; 820 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 821 " file'%s'", dex_location, next_location_checksum, 822 oat_file->GetLocation().c_str()); 823 error_msgs->push_back(error_msg); 824 } 825 break; // Not found, done. 826 } 827 828 // Checksum test. Test must succeed when generated. 829 success = !generated; 830 if (next_location_checksum_pointer != nullptr) { 831 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 832 } 833 834 if (success) { 835 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 836 if (dex_file == nullptr) { 837 success = false; 838 error_msgs->push_back(error_msg); 839 } else { 840 dex_files->push_back(dex_file); 841 } 842 } 843 844 // When we generated the file, we expect success, or something is terribly wrong. 845 CHECK_EQ(false, generated && !success) 846 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 847 << std::hex << " dex_location_checksum=" << next_location_checksum 848 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 849 } 850 851 if (dex_files->size() == old_size) { 852 success = false; // We did not even find classes.dex 853 } 854 855 if (success) { 856 return true; 857 } else { 858 // Free all the dex files we have loaded. 859 auto it = dex_files->begin() + old_size; 860 auto it_end = dex_files->end(); 861 for (; it != it_end; it++) { 862 delete *it; 863 } 864 dex_files->erase(dex_files->begin() + old_size, it_end); 865 866 return false; 867 } 868} 869 870// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 871// complicates the loading process, as we should not use an iterative loading process, because that 872// would register the oat file and dex files that come before the broken one. Instead, check all 873// multidex ahead of time. 874bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 875 std::vector<std::string>* error_msgs, 876 std::vector<const DexFile*>* dex_files) { 877 // 1) Check whether we have an open oat file. 878 // This requires a dex checksum, use the "primary" one. 879 uint32_t dex_location_checksum; 880 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 881 bool have_checksum = true; 882 std::string checksum_error_msg; 883 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 884 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 885 dex_location_checksum_pointer = nullptr; 886 have_checksum = false; 887 } 888 889 bool needs_registering = false; 890 891 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 892 dex_location_checksum_pointer); 893 std::unique_ptr<const OatFile> open_oat_file( 894 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 895 896 // 2) If we do not have an open one, maybe there's one on disk already. 897 898 // In case the oat file is not open, we play a locking game here so 899 // that if two different processes race to load and register or generate 900 // (or worse, one tries to open a partial generated file) we will be okay. 901 // This is actually common with apps that use DexClassLoader to work 902 // around the dex method reference limit and that have a background 903 // service running in a separate process. 904 ScopedFlock scoped_flock; 905 906 if (open_oat_file.get() == nullptr) { 907 if (oat_location != nullptr) { 908 // Can only do this if we have a checksum, else error. 909 if (!have_checksum) { 910 error_msgs->push_back(checksum_error_msg); 911 return false; 912 } 913 914 std::string error_msg; 915 916 // We are loading or creating one in the future. Time to set up the file lock. 917 if (!scoped_flock.Init(oat_location, &error_msg)) { 918 error_msgs->push_back(error_msg); 919 return false; 920 } 921 922 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 923 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 924 oat_location, &error_msg)); 925 926 if (open_oat_file.get() == nullptr) { 927 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 928 dex_location, oat_location, error_msg.c_str()); 929 VLOG(class_linker) << compound_msg; 930 error_msgs->push_back(compound_msg); 931 } 932 } else { 933 // TODO: What to lock here? 934 bool obsolete_file_cleanup_failed; 935 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 936 dex_location_checksum_pointer, 937 kRuntimeISA, error_msgs, 938 &obsolete_file_cleanup_failed)); 939 // There's no point in going forward and eventually try to regenerate the 940 // file if we couldn't remove the obsolete one. Mostly likely we will fail 941 // with the same error when trying to write the new file. 942 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 943 if (obsolete_file_cleanup_failed) { 944 return false; 945 } 946 } 947 needs_registering = true; 948 } 949 950 // 3) If we have an oat file, check all contained multidex files for our dex_location. 951 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 952 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 953 dex_location_checksum_pointer, 954 false, error_msgs, dex_files); 955 if (success) { 956 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 957 if (needs_registering) { 958 // We opened the oat file, so we must register it. 959 RegisterOatFile(oat_file); 960 } 961 // If the file isn't executable we failed patchoat but did manage to get the dex files. 962 return oat_file->IsExecutable(); 963 } else { 964 if (needs_registering) { 965 // We opened it, delete it. 966 open_oat_file.reset(); 967 } else { 968 open_oat_file.release(); // Do not delete open oat files. 969 } 970 } 971 972 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 973 974 // Need a checksum, fail else. 975 if (!have_checksum) { 976 error_msgs->push_back(checksum_error_msg); 977 return false; 978 } 979 980 // Look in cache location if no oat_location is given. 981 std::string cache_location; 982 if (oat_location == nullptr) { 983 // Use the dalvik cache. 984 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 985 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 986 oat_location = cache_location.c_str(); 987 } 988 989 bool has_flock = true; 990 // Definitely need to lock now. 991 if (!scoped_flock.HasFile()) { 992 std::string error_msg; 993 if (!scoped_flock.Init(oat_location, &error_msg)) { 994 error_msgs->push_back(error_msg); 995 has_flock = false; 996 } 997 } 998 999 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1000 // Create the oat file. 1001 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1002 oat_location, error_msgs)); 1003 } 1004 1005 // Failed, bail. 1006 if (open_oat_file.get() == nullptr) { 1007 std::string error_msg; 1008 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1009 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1010 error_msgs->push_back(error_msg); 1011 return false; 1012 } 1013 1014 // Try to load again, but stronger checks. 1015 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1016 dex_location_checksum_pointer, 1017 true, error_msgs, dex_files); 1018 if (success) { 1019 RegisterOatFile(open_oat_file.release()); 1020 return true; 1021 } else { 1022 return false; 1023 } 1024} 1025 1026const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1027 uint32_t dex_location_checksum, 1028 const char* oat_location, 1029 std::string* error_msg) { 1030 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1031 !Runtime::Current()->IsCompiler(), 1032 error_msg)); 1033 if (oat_file.get() == nullptr) { 1034 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1035 error_msg->c_str()); 1036 return nullptr; 1037 } 1038 Runtime* runtime = Runtime::Current(); 1039 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1040 if (image_space != nullptr) { 1041 const ImageHeader& image_header = image_space->GetImageHeader(); 1042 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1043 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1044 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1045 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1046 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1047 actual_image_oat_checksum); 1048 return nullptr; 1049 } 1050 1051 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1052 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1053 if (expected_image_oat_offset != actual_image_oat_offset) { 1054 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1055 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1056 actual_image_oat_offset); 1057 return nullptr; 1058 } 1059 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1060 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1061 if (expected_patch_delta != actual_patch_delta) { 1062 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1063 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1064 return nullptr; 1065 } 1066 } 1067 1068 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1069 &dex_location_checksum); 1070 if (oat_dex_file == nullptr) { 1071 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1072 dex_location); 1073 return nullptr; 1074 } 1075 uint32_t expected_dex_checksum = dex_location_checksum; 1076 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1077 if (expected_dex_checksum != actual_dex_checksum) { 1078 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1079 "found 0x%x", oat_location, expected_dex_checksum, 1080 actual_dex_checksum); 1081 return nullptr; 1082 } 1083 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1084 if (dex_file.get() != nullptr) { 1085 return oat_file.release(); 1086 } else { 1087 return nullptr; 1088 } 1089} 1090 1091const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1092 int fd, const char* oat_location, 1093 std::vector<std::string>* error_msgs) { 1094 // Generate the output oat file for the dex file 1095 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1096 std::string error_msg; 1097 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1098 CHECK(!error_msg.empty()); 1099 error_msgs->push_back(error_msg); 1100 return nullptr; 1101 } 1102 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1103 !Runtime::Current()->IsCompiler(), 1104 &error_msg)); 1105 if (oat_file.get() == nullptr) { 1106 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1107 oat_location, error_msg.c_str()); 1108 error_msgs->push_back(compound_msg); 1109 return nullptr; 1110 } 1111 1112 return oat_file.release(); 1113} 1114 1115bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1116 const InstructionSet instruction_set) { 1117 Runtime* runtime = Runtime::Current(); 1118 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1119 if (image_space == nullptr) { 1120 return false; 1121 } 1122 uint32_t image_oat_checksum = 0; 1123 if (instruction_set == kRuntimeISA) { 1124 const ImageHeader& image_header = image_space->GetImageHeader(); 1125 image_oat_checksum = image_header.GetOatChecksum(); 1126 } else { 1127 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1128 image_space->GetImageLocation().c_str(), instruction_set)); 1129 image_oat_checksum = image_header->GetOatChecksum(); 1130 } 1131 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1132} 1133 1134bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1135 const InstructionSet instruction_set, 1136 std::string* error_msg) { 1137 Runtime* runtime = Runtime::Current(); 1138 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1139 if (image_space == nullptr) { 1140 *error_msg = "No image space for verification against"; 1141 return false; 1142 } 1143 1144 // If the requested instruction set is the same as the current runtime, 1145 // we can use the checksums directly. If it isn't, we'll have to read the 1146 // image header from the image for the right instruction set. 1147 uint32_t image_oat_checksum = 0; 1148 uintptr_t image_oat_data_begin = 0; 1149 int32_t image_patch_delta = 0; 1150 if (instruction_set == runtime->GetInstructionSet()) { 1151 const ImageHeader& image_header = image_space->GetImageHeader(); 1152 image_oat_checksum = image_header.GetOatChecksum(); 1153 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1154 image_patch_delta = image_header.GetPatchDelta(); 1155 } else { 1156 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1157 image_space->GetImageLocation().c_str(), instruction_set)); 1158 image_oat_checksum = image_header->GetOatChecksum(); 1159 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1160 image_patch_delta = image_header->GetPatchDelta(); 1161 } 1162 const OatHeader& oat_header = oat_file->GetOatHeader(); 1163 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1164 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1165 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1166 if (!ret) { 1167 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1168 oat_file->GetLocation().c_str(), 1169 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1170 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1171 oat_file->GetOatHeader().GetImagePatchDelta(), 1172 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1173 } 1174 return ret; 1175} 1176 1177bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1178 const char* dex_location, 1179 uint32_t dex_location_checksum, 1180 const InstructionSet instruction_set, 1181 std::string* error_msg) { 1182 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1183 return false; 1184 } 1185 1186 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1187 &dex_location_checksum); 1188 if (oat_dex_file == nullptr) { 1189 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1190 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1191 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1192 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1193 oat_file->GetLocation().c_str(), 1194 oat_dex_file->GetDexFileLocation().c_str(), 1195 oat_dex_file->GetDexFileLocationChecksum()); 1196 } 1197 return false; 1198 } 1199 1200 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1201 return true; 1202} 1203 1204bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1205 const char* dex_location, 1206 const uint32_t* dex_location_checksum, 1207 std::string* error_msg) { 1208 CHECK(oat_file != nullptr); 1209 CHECK(dex_location != nullptr); 1210 std::unique_ptr<const DexFile> dex_file; 1211 if (dex_location_checksum == nullptr) { 1212 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1213 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1214 // directory. 1215 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1216 if (oat_dex_file == nullptr) { 1217 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1218 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1219 error_msg->c_str()); 1220 return false; 1221 } 1222 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1223 } else { 1224 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1225 kRuntimeISA, error_msg); 1226 if (!verified) { 1227 return false; 1228 } 1229 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1230 dex_location_checksum)->OpenDexFile(error_msg)); 1231 } 1232 return dex_file.get() != nullptr; 1233} 1234 1235const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1236 const char* dex_location, 1237 const uint32_t* dex_location_checksum, 1238 InstructionSet isa, 1239 std::vector<std::string>* error_msgs, 1240 bool* obsolete_file_cleanup_failed) { 1241 *obsolete_file_cleanup_failed = false; 1242 bool already_opened = false; 1243 std::string dex_location_str(dex_location); 1244 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1245 &already_opened, 1246 obsolete_file_cleanup_failed, 1247 error_msgs)); 1248 std::string error_msg; 1249 if (oat_file.get() == nullptr) { 1250 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1251 dex_location)); 1252 return nullptr; 1253 } else if (oat_file->IsExecutable() && 1254 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1255 dex_location_checksum, &error_msg)) { 1256 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1257 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1258 error_msg.c_str())); 1259 return nullptr; 1260 } else if (!oat_file->IsExecutable() && 1261 Runtime::Current()->GetHeap()->HasImageSpace() && 1262 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1263 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1264 "dex location '%s'. Image checksum incorrect.", 1265 oat_file->GetLocation().c_str(), dex_location)); 1266 return nullptr; 1267 } else { 1268 return oat_file.release(); 1269 } 1270} 1271 1272const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1273 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1274 for (size_t i = 0; i < oat_files_.size(); i++) { 1275 const OatFile* oat_file = oat_files_[i]; 1276 DCHECK(oat_file != nullptr); 1277 if (oat_file->GetLocation() == oat_location) { 1278 return oat_file; 1279 } 1280 } 1281 return nullptr; 1282} 1283 1284const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1285 InstructionSet isa, 1286 bool *already_opened, 1287 bool *obsolete_file_cleanup_failed, 1288 std::vector<std::string>* error_msgs) { 1289 // Find out if we've already opened the file 1290 const OatFile* ret = nullptr; 1291 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1292 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1293 if (ret != nullptr) { 1294 *already_opened = true; 1295 return ret; 1296 } 1297 1298 std::string dalvik_cache; 1299 bool have_android_data = false; 1300 bool have_dalvik_cache = false; 1301 bool is_global_cache = false; 1302 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1303 &have_android_data, &have_dalvik_cache, &is_global_cache); 1304 std::string cache_filename; 1305 if (have_dalvik_cache) { 1306 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1307 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1308 if (ret != nullptr) { 1309 *already_opened = true; 1310 return ret; 1311 } 1312 } else { 1313 // If we need to relocate we should just place odex back where it started. 1314 cache_filename = odex_filename; 1315 } 1316 1317 ret = nullptr; 1318 1319 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1320 // 1321 // Now we do the following: 1322 // 1) Try and open the odex version 1323 // 2) If present, checksum-verified & relocated correctly return it 1324 // 3) Close the odex version to free up its address space. 1325 // 4) Try and open the cache version 1326 // 5) If present, checksum-verified & relocated correctly return it 1327 // 6) Close the cache version to free up its address space. 1328 // 7) If we should relocate: 1329 // a) If we have opened and checksum-verified the odex version relocate it to 1330 // 'cache_filename' and return it 1331 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1332 // it. This should not happen often (I think only the run-test's will hit this case). 1333 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1334 // this point. 1335 // 9) Return nullptr 1336 1337 *already_opened = false; 1338 const Runtime* runtime = Runtime::Current(); 1339 CHECK(runtime != nullptr); 1340 bool executable = !runtime->IsCompiler(); 1341 1342 std::string odex_error_msg; 1343 bool should_patch_system = false; 1344 bool odex_checksum_verified = false; 1345 bool have_system_odex = false; 1346 { 1347 // There is a high probability that these both these oat files map similar/the same address 1348 // spaces so we must scope them like this so they each gets its turn. 1349 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1350 executable, &odex_error_msg)); 1351 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1352 &odex_checksum_verified, 1353 &odex_error_msg)) { 1354 return odex_oat_file.release(); 1355 } else { 1356 if (odex_checksum_verified) { 1357 // We can just relocate 1358 should_patch_system = true; 1359 odex_error_msg = "Image Patches are incorrect"; 1360 } 1361 if (odex_oat_file.get() != nullptr) { 1362 have_system_odex = true; 1363 } 1364 } 1365 } 1366 1367 std::string cache_error_msg; 1368 bool should_patch_cache = false; 1369 bool cache_checksum_verified = false; 1370 if (have_dalvik_cache) { 1371 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1372 executable, &cache_error_msg)); 1373 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1374 &cache_checksum_verified, 1375 &cache_error_msg)) { 1376 return cache_oat_file.release(); 1377 } else if (cache_checksum_verified) { 1378 // We can just relocate 1379 should_patch_cache = true; 1380 cache_error_msg = "Image Patches are incorrect"; 1381 } 1382 } else if (have_android_data) { 1383 // dalvik_cache does not exist but android data does. This means we should be able to create 1384 // it, so we should try. 1385 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1386 } 1387 1388 ret = nullptr; 1389 std::string error_msg; 1390 if (runtime->CanRelocate()) { 1391 // Run relocation 1392 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1393 if (space != nullptr) { 1394 const std::string& image_location = space->GetImageLocation(); 1395 if (odex_checksum_verified && should_patch_system) { 1396 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1397 } else if (cache_checksum_verified && should_patch_cache) { 1398 CHECK(have_dalvik_cache); 1399 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1400 } 1401 } else if (have_system_odex) { 1402 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1403 } 1404 } 1405 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1406 // implicitly: were able to fine where the cached version is but we were unable to use it, 1407 // either as a destination for relocation or to open a file. We should delete it if it is 1408 // there. 1409 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1410 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1411 "searching for dex file %s: %s", 1412 cache_filename.c_str(), dex_location.c_str(), 1413 strerror(errno)); 1414 error_msgs->push_back(rm_error_msg); 1415 VLOG(class_linker) << rm_error_msg; 1416 // Let the caller know that we couldn't remove the obsolete file. 1417 // This is a good indication that further writes may fail as well. 1418 *obsolete_file_cleanup_failed = true; 1419 } 1420 } 1421 if (ret == nullptr) { 1422 VLOG(class_linker) << error_msg; 1423 error_msgs->push_back(error_msg); 1424 std::string relocation_msg; 1425 if (runtime->CanRelocate()) { 1426 relocation_msg = StringPrintf(" and relocation failed"); 1427 } 1428 if (have_dalvik_cache && cache_checksum_verified) { 1429 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1430 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1431 cache_filename.c_str(), cache_error_msg.c_str(), 1432 relocation_msg.c_str()); 1433 } else { 1434 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1435 "dalvik_cache availible)%s.", odex_filename.c_str(), 1436 odex_error_msg.c_str(), relocation_msg.c_str()); 1437 } 1438 VLOG(class_linker) << error_msg; 1439 error_msgs->push_back(error_msg); 1440 } 1441 return ret; 1442} 1443 1444const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1445 InstructionSet isa, 1446 std::string* error_msg) { 1447 // We open it non-executable 1448 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1449 if (output.get() == nullptr) { 1450 return nullptr; 1451 } 1452 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1453 VerifyOatImageChecksum(output.get(), isa)) { 1454 return output.release(); 1455 } else { 1456 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1457 oat_path.c_str()); 1458 return nullptr; 1459 } 1460} 1461 1462const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1463 const std::string& output_oat, 1464 const std::string& image_location, 1465 InstructionSet isa, 1466 std::string* error_msg) { 1467 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1468 // We don't have an image space so there is no point in trying to patchoat. 1469 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1470 << "running without an image. Attempting to use oat file for interpretation."; 1471 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1472 } 1473 if (!Runtime::Current()->IsDex2OatEnabled()) { 1474 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1475 // input_oat but make sure we only do interpretation on it's dex files. 1476 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1477 << "disabled. Attempting to use oat file for interpretation"; 1478 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1479 } 1480 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1481 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1482 1483 std::string isa_arg("--instruction-set="); 1484 isa_arg += GetInstructionSetString(isa); 1485 std::string input_oat_filename_arg("--input-oat-file="); 1486 input_oat_filename_arg += input_oat; 1487 std::string output_oat_filename_arg("--output-oat-file="); 1488 output_oat_filename_arg += output_oat; 1489 std::string patched_image_arg("--patched-image-location="); 1490 patched_image_arg += image_location; 1491 1492 std::vector<std::string> argv; 1493 argv.push_back(patchoat); 1494 argv.push_back(isa_arg); 1495 argv.push_back(input_oat_filename_arg); 1496 argv.push_back(output_oat_filename_arg); 1497 argv.push_back(patched_image_arg); 1498 1499 std::string command_line(Join(argv, ' ')); 1500 LOG(INFO) << "Relocate Oat File: " << command_line; 1501 bool success = Exec(argv, error_msg); 1502 if (success) { 1503 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1504 !Runtime::Current()->IsCompiler(), error_msg)); 1505 bool checksum_verified = false; 1506 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1507 return output.release(); 1508 } else if (output.get() != nullptr) { 1509 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1510 "but output file '%s' failed verifcation: %s", 1511 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1512 } else { 1513 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1514 "but was unable to open output file '%s': %s", 1515 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1516 } 1517 } else if (!Runtime::Current()->IsCompiler()) { 1518 // patchoat failed which means we probably don't have enough room to place the output oat file, 1519 // instead of failing we should just run the interpreter from the dex files in the input oat. 1520 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1521 << "for interpretation. patchoat failure was: " << *error_msg; 1522 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1523 } else { 1524 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1525 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1526 error_msg->c_str()); 1527 } 1528 return nullptr; 1529} 1530 1531int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1532 Runtime* runtime = Runtime::Current(); 1533 int32_t real_patch_delta; 1534 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1535 CHECK(image_space != nullptr); 1536 if (isa == Runtime::Current()->GetInstructionSet()) { 1537 const ImageHeader& image_header = image_space->GetImageHeader(); 1538 real_patch_delta = image_header.GetPatchDelta(); 1539 } else { 1540 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1541 image_space->GetImageLocation().c_str(), isa)); 1542 real_patch_delta = image_header->GetPatchDelta(); 1543 } 1544 const OatHeader& oat_header = oat_file->GetOatHeader(); 1545 return real_patch_delta - oat_header.GetImagePatchDelta(); 1546} 1547 1548bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1549 bool* checksum_verified, 1550 std::string* error_msg) { 1551 Runtime* runtime = Runtime::Current(); 1552 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1553 if (image_space == nullptr) { 1554 *error_msg = "No image space present"; 1555 return false; 1556 } 1557 uint32_t real_image_checksum; 1558 void* real_image_oat_offset; 1559 int32_t real_patch_delta; 1560 if (isa == runtime->GetInstructionSet()) { 1561 const ImageHeader& image_header = image_space->GetImageHeader(); 1562 real_image_checksum = image_header.GetOatChecksum(); 1563 real_image_oat_offset = image_header.GetOatDataBegin(); 1564 real_patch_delta = image_header.GetPatchDelta(); 1565 } else { 1566 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1567 image_space->GetImageLocation().c_str(), isa)); 1568 real_image_checksum = image_header->GetOatChecksum(); 1569 real_image_oat_offset = image_header->GetOatDataBegin(); 1570 real_patch_delta = image_header->GetPatchDelta(); 1571 } 1572 1573 const OatHeader& oat_header = oat_file->GetOatHeader(); 1574 std::string compound_msg; 1575 1576 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1577 *checksum_verified = oat_image_checksum == real_image_checksum; 1578 if (!*checksum_verified) { 1579 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1580 real_image_checksum, oat_image_checksum); 1581 } 1582 1583 void* oat_image_oat_offset = 1584 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1585 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1586 if (!offset_verified) { 1587 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1588 real_image_oat_offset, oat_image_oat_offset); 1589 } 1590 1591 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1592 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1593 if (!patch_delta_verified) { 1594 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1595 real_patch_delta, oat_patch_delta); 1596 } 1597 1598 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1599 if (!ret) { 1600 *error_msg = "Oat file failed to verify:" + compound_msg; 1601 } 1602 return ret; 1603} 1604 1605const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1606 std::string* error_msg) { 1607 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1608 if (oat_file != nullptr) { 1609 return oat_file; 1610 } 1611 1612 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1613 error_msg); 1614} 1615 1616static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1617 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1618 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1619 1620 DCHECK(obj != nullptr); 1621 DCHECK(class_linker != nullptr); 1622 1623 if (obj->IsArtMethod()) { 1624 mirror::ArtMethod* method = obj->AsArtMethod(); 1625 if (!method->IsNative()) { 1626 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 1627 if (method != Runtime::Current()->GetResolutionMethod()) { 1628 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1629 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1630 } 1631 } 1632 } 1633} 1634 1635void ClassLinker::InitFromImage() { 1636 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1637 CHECK(!init_done_); 1638 1639 Thread* self = Thread::Current(); 1640 gc::Heap* heap = Runtime::Current()->GetHeap(); 1641 gc::space::ImageSpace* space = heap->GetImageSpace(); 1642 dex_cache_image_class_lookup_required_ = true; 1643 CHECK(space != nullptr); 1644 OatFile& oat_file = GetImageOatFile(space); 1645 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1646 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1647 const char* image_file_location = oat_file.GetOatHeader(). 1648 GetStoreValueByKey(OatHeader::kImageLocationKey); 1649 CHECK(image_file_location == nullptr || *image_file_location == 0); 1650 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1651 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1652 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1653 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1654 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1655 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1656 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1657 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1658 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1659 1660 StackHandleScope<1> hs(self); 1661 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1662 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1663 AsObjectArray<mirror::Class>())); 1664 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1665 1666 // Special case of setting up the String class early so that we can test arbitrary objects 1667 // as being Strings or not 1668 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1669 1670 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1671 static_cast<uint32_t>(dex_caches->GetLength())); 1672 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1673 StackHandleScope<1> hs(self); 1674 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1675 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1676 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1677 nullptr); 1678 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1679 std::string error_msg; 1680 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1681 if (dex_file == nullptr) { 1682 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1683 << " from within oat file " << oat_file.GetLocation() 1684 << " error '" << error_msg << "'"; 1685 } 1686 1687 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1688 1689 AppendToBootClassPath(*dex_file, dex_cache); 1690 } 1691 1692 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1693 // bitmap walk. 1694 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1695 1696 // Set entry point to interpreter if in InterpretOnly mode. 1697 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1698 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1699 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1700 } 1701 1702 // reinit class_roots_ 1703 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1704 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1705 1706 // reinit array_iftable_ from any array class instance, they should be == 1707 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1708 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1709 // String class root was set above 1710 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1711 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1712 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1713 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1714 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1715 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1716 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1717 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1718 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1719 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1720 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1721 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1722 1723 FinishInit(self); 1724 1725 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1726} 1727 1728void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1729 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1730 if ((flags & kVisitRootFlagAllRoots) != 0) { 1731 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1732 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1733 } 1734 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1735 for (auto& pair : new_class_roots_) { 1736 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1737 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1738 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1739 if (UNLIKELY(new_ref != old_ref)) { 1740 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1741 // corresponding object. This is slow, but luckily for us, this may only happen with a 1742 // concurrent moving GC. 1743 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1744 it != end && it->first == pair.first; ++it) { 1745 // If the class stored matches the old class, update it to the new value. 1746 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1747 it->second = GcRoot<mirror::Class>(new_ref); 1748 } 1749 } 1750 } 1751 } 1752 } 1753 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1754 new_class_roots_.clear(); 1755 } 1756 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1757 log_new_class_table_roots_ = true; 1758 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1759 log_new_class_table_roots_ = false; 1760 } 1761 // We deliberately ignore the class roots in the image since we 1762 // handle image roots by using the MS/CMS rescanning of dirty cards. 1763} 1764 1765// Keep in sync with InitCallback. Anything we visit, we need to 1766// reinit references to when reinitializing a ClassLinker from a 1767// mapped image. 1768void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1769 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1770 Thread* self = Thread::Current(); 1771 { 1772 ReaderMutexLock mu(self, dex_lock_); 1773 if ((flags & kVisitRootFlagAllRoots) != 0) { 1774 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1775 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1776 } 1777 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1778 for (size_t index : new_dex_cache_roots_) { 1779 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1780 } 1781 } 1782 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1783 new_dex_cache_roots_.clear(); 1784 } 1785 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1786 log_new_dex_caches_roots_ = true; 1787 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1788 log_new_dex_caches_roots_ = false; 1789 } 1790 } 1791 VisitClassRoots(callback, arg, flags); 1792 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1793 DCHECK(!array_iftable_.IsNull()); 1794 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1795 if (!find_array_class_cache_[i].IsNull()) { 1796 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1797 } 1798 } 1799} 1800 1801void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1802 if (dex_cache_image_class_lookup_required_) { 1803 MoveImageClassesToClassTable(); 1804 } 1805 // TODO: why isn't this a ReaderMutexLock? 1806 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1807 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1808 mirror::Class* c = it.second.Read(); 1809 if (!visitor(c, arg)) { 1810 return; 1811 } 1812 } 1813} 1814 1815static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1816 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1817 classes->insert(c); 1818 return true; 1819} 1820 1821struct GetClassesVisitorArrayArg { 1822 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1823 int32_t index; 1824 bool success; 1825}; 1826 1827static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1828 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1829 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1830 if (arg->index < (*arg->classes)->GetLength()) { 1831 (*arg->classes)->Set(arg->index, c); 1832 arg->index++; 1833 return true; 1834 } else { 1835 arg->success = false; 1836 return false; 1837 } 1838} 1839 1840void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1841 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1842 // is avoiding duplicates. 1843 if (!kMovingClasses) { 1844 std::set<mirror::Class*> classes; 1845 VisitClasses(GetClassesVisitorSet, &classes); 1846 for (mirror::Class* klass : classes) { 1847 if (!visitor(klass, arg)) { 1848 return; 1849 } 1850 } 1851 } else { 1852 Thread* self = Thread::Current(); 1853 StackHandleScope<1> hs(self); 1854 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1855 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1856 GetClassesVisitorArrayArg local_arg; 1857 local_arg.classes = &classes; 1858 local_arg.success = false; 1859 // We size the array assuming classes won't be added to the class table during the visit. 1860 // If this assumption fails we iterate again. 1861 while (!local_arg.success) { 1862 size_t class_table_size; 1863 { 1864 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1865 class_table_size = class_table_.size(); 1866 } 1867 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1868 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1869 classes.Assign( 1870 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1871 CHECK(classes.Get() != nullptr); // OOME. 1872 local_arg.index = 0; 1873 local_arg.success = true; 1874 VisitClasses(GetClassesVisitorArray, &local_arg); 1875 } 1876 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1877 // If the class table shrank during creation of the clases array we expect null elements. If 1878 // the class table grew then the loop repeats. If classes are created after the loop has 1879 // finished then we don't visit. 1880 mirror::Class* klass = classes->Get(i); 1881 if (klass != nullptr && !visitor(klass, arg)) { 1882 return; 1883 } 1884 } 1885 } 1886} 1887 1888ClassLinker::~ClassLinker() { 1889 mirror::Class::ResetClass(); 1890 mirror::String::ResetClass(); 1891 mirror::Reference::ResetClass(); 1892 mirror::ArtField::ResetClass(); 1893 mirror::ArtMethod::ResetClass(); 1894 mirror::BooleanArray::ResetArrayClass(); 1895 mirror::ByteArray::ResetArrayClass(); 1896 mirror::CharArray::ResetArrayClass(); 1897 mirror::DoubleArray::ResetArrayClass(); 1898 mirror::FloatArray::ResetArrayClass(); 1899 mirror::IntArray::ResetArrayClass(); 1900 mirror::LongArray::ResetArrayClass(); 1901 mirror::ShortArray::ResetArrayClass(); 1902 mirror::Throwable::ResetClass(); 1903 mirror::StackTraceElement::ResetClass(); 1904 STLDeleteElements(&boot_class_path_); 1905 STLDeleteElements(&oat_files_); 1906} 1907 1908mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1909 gc::Heap* heap = Runtime::Current()->GetHeap(); 1910 StackHandleScope<16> hs(self); 1911 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1912 Handle<mirror::DexCache> dex_cache( 1913 hs.NewHandle(down_cast<mirror::DexCache*>( 1914 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1915 VoidFunctor())))); 1916 if (dex_cache.Get() == nullptr) { 1917 return nullptr; 1918 } 1919 Handle<mirror::String> 1920 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1921 if (location.Get() == nullptr) { 1922 return nullptr; 1923 } 1924 Handle<mirror::ObjectArray<mirror::String>> 1925 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1926 if (strings.Get() == nullptr) { 1927 return nullptr; 1928 } 1929 Handle<mirror::ObjectArray<mirror::Class>> 1930 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1931 if (types.Get() == nullptr) { 1932 return nullptr; 1933 } 1934 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1935 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1936 if (methods.Get() == nullptr) { 1937 return nullptr; 1938 } 1939 Handle<mirror::ObjectArray<mirror::ArtField>> 1940 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1941 if (fields.Get() == nullptr) { 1942 return nullptr; 1943 } 1944 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1945 fields.Get()); 1946 return dex_cache.Get(); 1947} 1948 1949mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1950 uint32_t class_size) { 1951 DCHECK_GE(class_size, sizeof(mirror::Class)); 1952 gc::Heap* heap = Runtime::Current()->GetHeap(); 1953 mirror::Class::InitializeClassVisitor visitor(class_size); 1954 mirror::Object* k = kMovingClasses ? 1955 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1956 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1957 if (UNLIKELY(k == nullptr)) { 1958 CHECK(self->IsExceptionPending()); // OOME. 1959 return nullptr; 1960 } 1961 return k->AsClass(); 1962} 1963 1964mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1965 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1966} 1967 1968mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1969 return down_cast<mirror::ArtField*>( 1970 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1971} 1972 1973mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1974 return down_cast<mirror::ArtMethod*>( 1975 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1976} 1977 1978mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1979 Thread* self, size_t length) { 1980 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1981 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1982} 1983 1984mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1985 mirror::Class* klass) { 1986 DCHECK(klass != nullptr); 1987 1988 // For temporary classes we must wait for them to be retired. 1989 if (init_done_ && klass->IsTemp()) { 1990 CHECK(!klass->IsResolved()); 1991 if (klass->IsErroneous()) { 1992 ThrowEarlierClassFailure(klass); 1993 return nullptr; 1994 } 1995 StackHandleScope<1> hs(self); 1996 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1997 ObjectLock<mirror::Class> lock(self, h_class); 1998 // Loop and wait for the resolving thread to retire this class. 1999 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2000 lock.WaitIgnoringInterrupts(); 2001 } 2002 if (h_class->IsErroneous()) { 2003 ThrowEarlierClassFailure(h_class.Get()); 2004 return nullptr; 2005 } 2006 CHECK(h_class->IsRetired()); 2007 // Get the updated class from class table. 2008 klass = LookupClass(self, descriptor, h_class.Get()->GetClassLoader()); 2009 } 2010 2011 // Wait for the class if it has not already been linked. 2012 if (!klass->IsResolved() && !klass->IsErroneous()) { 2013 StackHandleScope<1> hs(self); 2014 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2015 ObjectLock<mirror::Class> lock(self, h_class); 2016 // Check for circular dependencies between classes. 2017 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2018 ThrowClassCircularityError(h_class.Get()); 2019 h_class->SetStatus(mirror::Class::kStatusError, self); 2020 return nullptr; 2021 } 2022 // Wait for the pending initialization to complete. 2023 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2024 lock.WaitIgnoringInterrupts(); 2025 } 2026 } 2027 2028 if (klass->IsErroneous()) { 2029 ThrowEarlierClassFailure(klass); 2030 return nullptr; 2031 } 2032 // Return the loaded class. No exceptions should be pending. 2033 CHECK(klass->IsResolved()) << PrettyClass(klass); 2034 self->AssertNoPendingException(); 2035 return klass; 2036} 2037 2038typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2039 2040// Search a collection of DexFiles for a descriptor 2041ClassPathEntry FindInClassPath(const char* descriptor, 2042 const std::vector<const DexFile*>& class_path) { 2043 for (size_t i = 0; i != class_path.size(); ++i) { 2044 const DexFile* dex_file = class_path[i]; 2045 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2046 if (dex_class_def != nullptr) { 2047 return ClassPathEntry(dex_file, dex_class_def); 2048 } 2049 } 2050 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2051 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2052 static_cast<const DexFile::ClassDef*>(nullptr)); 2053} 2054 2055mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2056 Thread* self, const char* descriptor, 2057 Handle<mirror::ClassLoader> class_loader) { 2058 if (class_loader->GetClass() != 2059 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2060 class_loader->GetParent()->GetClass() != 2061 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2062 return nullptr; 2063 } 2064 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2065 // Check if this would be found in the parent boot class loader. 2066 if (pair.second != nullptr) { 2067 mirror::Class* klass = LookupClass(self, descriptor, nullptr); 2068 if (klass != nullptr) { 2069 return EnsureResolved(self, descriptor, klass); 2070 } 2071 klass = DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2072 *pair.second); 2073 if (klass != nullptr) { 2074 return klass; 2075 } 2076 CHECK(self->IsExceptionPending()) << descriptor; 2077 self->ClearException(); 2078 } else { 2079 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2080 StackHandleScope<3> hs(self); 2081 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2082 // We need to get the DexPathList and loop through it. 2083 Handle<mirror::ArtField> cookie_field = 2084 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2085 Handle<mirror::ArtField> dex_file_field = 2086 hs.NewHandle( 2087 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2088 mirror::Object* dex_path_list = 2089 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2090 GetObject(class_loader.Get()); 2091 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2092 cookie_field.Get() != nullptr) { 2093 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2094 mirror::Object* dex_elements_obj = 2095 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2096 GetObject(dex_path_list); 2097 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2098 // at the mCookie which is a DexFile vector. 2099 if (dex_elements_obj != nullptr) { 2100 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2101 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2102 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2103 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2104 if (element == nullptr) { 2105 // Should never happen, fall back to java code to throw a NPE. 2106 break; 2107 } 2108 mirror::Object* dex_file = dex_file_field->GetObject(element); 2109 if (dex_file != nullptr) { 2110 const uint64_t cookie = cookie_field->GetLong(dex_file); 2111 auto* dex_files = 2112 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2113 if (dex_files == nullptr) { 2114 // This should never happen so log a warning. 2115 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2116 break; 2117 } 2118 for (const DexFile* dex_file : *dex_files) { 2119 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2120 if (dex_class_def != nullptr) { 2121 RegisterDexFile(*dex_file); 2122 mirror::Class* klass = 2123 DefineClass(self, descriptor, class_loader, *dex_file, *dex_class_def); 2124 if (klass == nullptr) { 2125 CHECK(self->IsExceptionPending()) << descriptor; 2126 self->ClearException(); 2127 return nullptr; 2128 } 2129 return klass; 2130 } 2131 } 2132 } 2133 } 2134 } 2135 } 2136 } 2137 return nullptr; 2138} 2139 2140mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2141 Handle<mirror::ClassLoader> class_loader) { 2142 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2143 DCHECK(self != nullptr); 2144 self->AssertNoPendingException(); 2145 if (descriptor[1] == '\0') { 2146 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2147 // for primitive classes that aren't backed by dex files. 2148 return FindPrimitiveClass(descriptor[0]); 2149 } 2150 // Find the class in the loaded classes table. 2151 mirror::Class* klass = LookupClass(self, descriptor, class_loader.Get()); 2152 if (klass != nullptr) { 2153 return EnsureResolved(self, descriptor, klass); 2154 } 2155 // Class is not yet loaded. 2156 if (descriptor[0] == '[') { 2157 return CreateArrayClass(self, descriptor, class_loader); 2158 } else if (class_loader.Get() == nullptr) { 2159 // The boot class loader, search the boot class path. 2160 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2161 if (pair.second != nullptr) { 2162 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2163 *pair.second); 2164 } else { 2165 // The boot class loader is searched ahead of the application class loader, failures are 2166 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2167 // trigger the chaining with a proper stack trace. 2168 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2169 self->SetException(ThrowLocation(), pre_allocated); 2170 return nullptr; 2171 } 2172 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2173 // First try with the bootstrap class loader. 2174 if (class_loader.Get() != nullptr) { 2175 klass = LookupClass(self, descriptor, nullptr); 2176 if (klass != nullptr) { 2177 return EnsureResolved(self, descriptor, klass); 2178 } 2179 } 2180 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2181 // a NoClassDefFoundError being allocated. 2182 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2183 if (pair.second != nullptr) { 2184 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2185 *pair.second); 2186 } 2187 // Next try the compile time class path. 2188 const std::vector<const DexFile*>* class_path; 2189 { 2190 ScopedObjectAccessUnchecked soa(self); 2191 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2192 soa.AddLocalReference<jobject>(class_loader.Get())); 2193 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2194 } 2195 pair = FindInClassPath(descriptor, *class_path); 2196 if (pair.second != nullptr) { 2197 return DefineClass(self, descriptor, class_loader, *pair.first, *pair.second); 2198 } else { 2199 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2200 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2201 self->SetException(ThrowLocation(), pre_allocated); 2202 return nullptr; 2203 } 2204 } else { 2205 ScopedObjectAccessUnchecked soa(self); 2206 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2207 if (klass != nullptr) { 2208 return klass; 2209 } 2210 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2211 soa.AddLocalReference<jobject>(class_loader.Get())); 2212 std::string class_name_string(DescriptorToDot(descriptor)); 2213 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2214 { 2215 ScopedThreadStateChange tsc(self, kNative); 2216 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2217 soa.Env()->NewStringUTF(class_name_string.c_str())); 2218 if (class_name_object.get() == nullptr) { 2219 DCHECK(self->IsExceptionPending()); // OOME. 2220 return nullptr; 2221 } 2222 CHECK(class_loader_object.get() != nullptr); 2223 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2224 WellKnownClasses::java_lang_ClassLoader_loadClass, 2225 class_name_object.get())); 2226 } 2227 if (self->IsExceptionPending()) { 2228 // If the ClassLoader threw, pass that exception up. 2229 return nullptr; 2230 } else if (result.get() == nullptr) { 2231 // broken loader - throw NPE to be compatible with Dalvik 2232 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2233 class_name_string.c_str()).c_str()); 2234 return nullptr; 2235 } else { 2236 // success, return mirror::Class* 2237 return soa.Decode<mirror::Class*>(result.get()); 2238 } 2239 } 2240 UNREACHABLE(); 2241} 2242 2243mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, 2244 Handle<mirror::ClassLoader> class_loader, 2245 const DexFile& dex_file, 2246 const DexFile::ClassDef& dex_class_def) { 2247 StackHandleScope<3> hs(self); 2248 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2249 bool should_allocate = false; 2250 2251 // Load the class from the dex file. 2252 if (UNLIKELY(!init_done_)) { 2253 // finish up init of hand crafted class_roots_ 2254 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2255 klass.Assign(GetClassRoot(kJavaLangObject)); 2256 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2257 klass.Assign(GetClassRoot(kJavaLangClass)); 2258 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2259 klass.Assign(GetClassRoot(kJavaLangString)); 2260 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2261 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2262 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2263 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2264 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2265 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2266 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2267 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2268 } else { 2269 should_allocate = true; 2270 } 2271 } else { 2272 should_allocate = true; 2273 } 2274 2275 if (should_allocate) { 2276 // Allocate a class with the status of not ready. 2277 // Interface object should get the right size here. Regular class will 2278 // figure out the right size later and be replaced with one of the right 2279 // size when the class becomes resolved. 2280 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2281 } 2282 if (UNLIKELY(klass.Get() == nullptr)) { 2283 CHECK(self->IsExceptionPending()); // Expect an OOME. 2284 return nullptr; 2285 } 2286 klass->SetDexCache(FindDexCache(dex_file)); 2287 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2288 ObjectLock<mirror::Class> lock(self, klass); 2289 if (self->IsExceptionPending()) { 2290 // An exception occured during load, set status to erroneous while holding klass' lock in case 2291 // notification is necessary. 2292 if (!klass->IsErroneous()) { 2293 klass->SetStatus(mirror::Class::kStatusError, self); 2294 } 2295 return nullptr; 2296 } 2297 klass->SetClinitThreadId(self->GetTid()); 2298 2299 // Add the newly loaded class to the loaded classes table. 2300 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2301 if (existing != nullptr) { 2302 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2303 // this thread to block. 2304 return EnsureResolved(self, descriptor, existing); 2305 } 2306 2307 // Finish loading (if necessary) by finding parents 2308 CHECK(!klass->IsLoaded()); 2309 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2310 // Loading failed. 2311 if (!klass->IsErroneous()) { 2312 klass->SetStatus(mirror::Class::kStatusError, self); 2313 } 2314 return nullptr; 2315 } 2316 CHECK(klass->IsLoaded()); 2317 // Link the class (if necessary) 2318 CHECK(!klass->IsResolved()); 2319 // TODO: Use fast jobjects? 2320 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2321 2322 mirror::Class* new_class = nullptr; 2323 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2324 // Linking failed. 2325 if (!klass->IsErroneous()) { 2326 klass->SetStatus(mirror::Class::kStatusError, self); 2327 } 2328 return nullptr; 2329 } 2330 self->AssertNoPendingException(); 2331 CHECK(new_class != nullptr) << descriptor; 2332 CHECK(new_class->IsResolved()) << descriptor; 2333 2334 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2335 2336 /* 2337 * We send CLASS_PREPARE events to the debugger from here. The 2338 * definition of "preparation" is creating the static fields for a 2339 * class and initializing them to the standard default values, but not 2340 * executing any code (that comes later, during "initialization"). 2341 * 2342 * We did the static preparation in LinkClass. 2343 * 2344 * The class has been prepared and resolved but possibly not yet verified 2345 * at this point. 2346 */ 2347 Dbg::PostClassPrepare(new_class_h.Get()); 2348 2349 return new_class_h.Get(); 2350} 2351 2352uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2353 const DexFile::ClassDef& dex_class_def) { 2354 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2355 size_t num_ref = 0; 2356 size_t num_8 = 0; 2357 size_t num_16 = 0; 2358 size_t num_32 = 0; 2359 size_t num_64 = 0; 2360 if (class_data != nullptr) { 2361 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2362 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2363 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2364 char c = descriptor[0]; 2365 switch (c) { 2366 case 'L': 2367 case '[': 2368 num_ref++; 2369 break; 2370 case 'J': 2371 case 'D': 2372 num_64++; 2373 break; 2374 case 'I': 2375 case 'F': 2376 num_32++; 2377 break; 2378 case 'S': 2379 case 'C': 2380 num_16++; 2381 break; 2382 case 'B': 2383 case 'Z': 2384 num_8++; 2385 break; 2386 default: 2387 LOG(FATAL) << "Unknown descriptor: " << c; 2388 } 2389 } 2390 } 2391 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2392} 2393 2394OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2395 bool* found) { 2396 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2397 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2398 if (oat_dex_file == nullptr) { 2399 *found = false; 2400 return OatFile::OatClass::Invalid(); 2401 } 2402 *found = true; 2403 return oat_dex_file->GetOatClass(class_def_idx); 2404} 2405 2406static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2407 uint32_t method_idx) { 2408 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2409 const uint8_t* class_data = dex_file.GetClassData(class_def); 2410 CHECK(class_data != nullptr); 2411 ClassDataItemIterator it(dex_file, class_data); 2412 // Skip fields 2413 while (it.HasNextStaticField()) { 2414 it.Next(); 2415 } 2416 while (it.HasNextInstanceField()) { 2417 it.Next(); 2418 } 2419 // Process methods 2420 size_t class_def_method_index = 0; 2421 while (it.HasNextDirectMethod()) { 2422 if (it.GetMemberIndex() == method_idx) { 2423 return class_def_method_index; 2424 } 2425 class_def_method_index++; 2426 it.Next(); 2427 } 2428 while (it.HasNextVirtualMethod()) { 2429 if (it.GetMemberIndex() == method_idx) { 2430 return class_def_method_index; 2431 } 2432 class_def_method_index++; 2433 it.Next(); 2434 } 2435 DCHECK(!it.HasNext()); 2436 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2437 return 0; 2438} 2439 2440const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2441 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2442 // method for direct methods (or virtual methods made direct). 2443 mirror::Class* declaring_class = method->GetDeclaringClass(); 2444 size_t oat_method_index; 2445 if (method->IsStatic() || method->IsDirect()) { 2446 // Simple case where the oat method index was stashed at load time. 2447 oat_method_index = method->GetMethodIndex(); 2448 } else { 2449 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2450 // by search for its position in the declared virtual methods. 2451 oat_method_index = declaring_class->NumDirectMethods(); 2452 size_t end = declaring_class->NumVirtualMethods(); 2453 bool found = false; 2454 for (size_t i = 0; i < end; i++) { 2455 // Check method index instead of identity in case of duplicate method definitions. 2456 if (method->GetDexMethodIndex() == 2457 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2458 found = true; 2459 break; 2460 } 2461 oat_method_index++; 2462 } 2463 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2464 } 2465 DCHECK_EQ(oat_method_index, 2466 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2467 method->GetDeclaringClass()->GetDexClassDefIndex(), 2468 method->GetDexMethodIndex())); 2469 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2470 declaring_class->GetDexClassDefIndex(), 2471 found); 2472 if (!found) { 2473 return OatFile::OatMethod::Invalid(); 2474 } 2475 *found = true; 2476 return oat_class.GetOatMethod(oat_method_index); 2477} 2478 2479// Special case to get oat code without overwriting a trampoline. 2480const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2481 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2482 if (method->IsProxyMethod()) { 2483 return GetQuickProxyInvokeHandler(); 2484 } 2485 bool found; 2486 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2487 const void* result = nullptr; 2488 if (found) { 2489 result = oat_method.GetQuickCode(); 2490 } 2491 2492 if (result == nullptr) { 2493 if (method->IsNative()) { 2494 // No code and native? Use generic trampoline. 2495 result = GetQuickGenericJniStub(); 2496 } else if (method->IsPortableCompiled()) { 2497 // No code? Do we expect portable code? 2498 result = GetQuickToPortableBridge(); 2499 } else { 2500 // No code? You must mean to go into the interpreter. 2501 result = GetQuickToInterpreterBridge(); 2502 } 2503 } 2504 return result; 2505} 2506 2507const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2508 bool* have_portable_code) { 2509 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2510 *have_portable_code = false; 2511 if (method->IsProxyMethod()) { 2512 return GetPortableProxyInvokeHandler(); 2513 } 2514 bool found; 2515 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2516 const void* result = nullptr; 2517 const void* quick_code = nullptr; 2518 if (found) { 2519 result = oat_method.GetPortableCode(); 2520 quick_code = oat_method.GetQuickCode(); 2521 } 2522 2523 if (result == nullptr) { 2524 if (quick_code == nullptr) { 2525 // No code? You must mean to go into the interpreter. 2526 result = GetPortableToInterpreterBridge(); 2527 } else { 2528 // No code? But there's quick code, so use a bridge. 2529 result = GetPortableToQuickBridge(); 2530 } 2531 } else { 2532 *have_portable_code = true; 2533 } 2534 return result; 2535} 2536 2537const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2538 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2539 return nullptr; 2540 } 2541 bool found; 2542 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2543 return found ? oat_method.GetQuickCode() : nullptr; 2544} 2545 2546const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2547 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2548 return nullptr; 2549 } 2550 bool found; 2551 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2552 return found ? oat_method.GetPortableCode() : nullptr; 2553} 2554 2555const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2556 uint32_t method_idx) { 2557 bool found; 2558 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2559 if (!found) { 2560 return nullptr; 2561 } 2562 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2563 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2564} 2565 2566const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2567 uint32_t method_idx) { 2568 bool found; 2569 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2570 if (!found) { 2571 return nullptr; 2572 } 2573 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2574 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2575} 2576 2577// Returns true if the method must run with interpreter, false otherwise. 2578static bool NeedsInterpreter( 2579 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2580 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2581 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2582 // No code: need interpreter. 2583 // May return true for native code, in the case of generic JNI 2584 // DCHECK(!method->IsNative()); 2585 return true; 2586 } 2587#ifdef ART_SEA_IR_MODE 2588 ScopedObjectAccess soa(Thread::Current()); 2589 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2590 LOG(INFO) << "Found " << PrettyMethod(method); 2591 return false; 2592 } 2593#endif 2594 // If interpreter mode is enabled, every method (except native and proxy) must 2595 // be run with interpreter. 2596 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2597 !method->IsNative() && !method->IsProxyMethod(); 2598} 2599 2600void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2601 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2602 if (klass->NumDirectMethods() == 0) { 2603 return; // No direct methods => no static methods. 2604 } 2605 Runtime* runtime = Runtime::Current(); 2606 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2607 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2608 return; // OAT file unavailable. 2609 } 2610 } 2611 2612 const DexFile& dex_file = klass->GetDexFile(); 2613 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2614 CHECK(dex_class_def != nullptr); 2615 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2616 // There should always be class data if there were direct methods. 2617 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2618 ClassDataItemIterator it(dex_file, class_data); 2619 // Skip fields 2620 while (it.HasNextStaticField()) { 2621 it.Next(); 2622 } 2623 while (it.HasNextInstanceField()) { 2624 it.Next(); 2625 } 2626 bool has_oat_class; 2627 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2628 &has_oat_class); 2629 // Link the code of methods skipped by LinkCode. 2630 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2631 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2632 if (!method->IsStatic()) { 2633 // Only update static methods. 2634 continue; 2635 } 2636 const void* portable_code = nullptr; 2637 const void* quick_code = nullptr; 2638 if (has_oat_class) { 2639 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2640 portable_code = oat_method.GetPortableCode(); 2641 quick_code = oat_method.GetQuickCode(); 2642 } 2643 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2644 bool have_portable_code = false; 2645 if (enter_interpreter) { 2646 // Use interpreter entry point. 2647 // Check whether the method is native, in which case it's generic JNI. 2648 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2649 quick_code = GetQuickGenericJniStub(); 2650 portable_code = GetPortableToQuickBridge(); 2651 } else { 2652 portable_code = GetPortableToInterpreterBridge(); 2653 quick_code = GetQuickToInterpreterBridge(); 2654 } 2655 } else { 2656 if (portable_code == nullptr) { 2657 portable_code = GetPortableToQuickBridge(); 2658 } else { 2659 have_portable_code = true; 2660 } 2661 if (quick_code == nullptr) { 2662 quick_code = GetQuickToPortableBridge(); 2663 } 2664 } 2665 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2666 have_portable_code); 2667 } 2668 // Ignore virtual methods on the iterator. 2669} 2670 2671void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2672 const OatFile::OatClass* oat_class, 2673 const DexFile& dex_file, uint32_t dex_method_index, 2674 uint32_t method_index) { 2675 Runtime* runtime = Runtime::Current(); 2676 if (runtime->IsCompiler()) { 2677 // The following code only applies to a non-compiler runtime. 2678 return; 2679 } 2680 // Method shouldn't have already been linked. 2681 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2682 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2683 if (oat_class != nullptr) { 2684 // Every kind of method should at least get an invoke stub from the oat_method. 2685 // non-abstract methods also get their code pointers. 2686 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2687 oat_method.LinkMethod(method.Get()); 2688 } 2689 2690 // Install entry point from interpreter. 2691 bool enter_interpreter = NeedsInterpreter(method.Get(), 2692 method->GetEntryPointFromQuickCompiledCode(), 2693 method->GetEntryPointFromPortableCompiledCode()); 2694 if (enter_interpreter && !method->IsNative()) { 2695 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2696 } else { 2697 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2698 } 2699 2700 if (method->IsAbstract()) { 2701 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2702 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2703 return; 2704 } 2705 2706 bool have_portable_code = false; 2707 if (method->IsStatic() && !method->IsConstructor()) { 2708 // For static methods excluding the class initializer, install the trampoline. 2709 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2710 // after initializing class (see ClassLinker::InitializeClass method). 2711 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2712 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionStub()); 2713 } else if (enter_interpreter) { 2714 if (!method->IsNative()) { 2715 // Set entry point from compiled code if there's no code or in interpreter only mode. 2716 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2717 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2718 } else { 2719 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2720 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2721 } 2722 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2723 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2724 have_portable_code = true; 2725 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2726 } else { 2727 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2728 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2729 } 2730 2731 if (method->IsNative()) { 2732 // Unregistering restores the dlsym lookup stub. 2733 method->UnregisterNative(); 2734 2735 if (enter_interpreter) { 2736 // We have a native method here without code. Then it should have either the generic JNI 2737 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2738 // TODO: this doesn't handle all the cases where trampolines may be installed. 2739 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2740 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2741 } 2742 } 2743 2744 // Allow instrumentation its chance to hijack code. 2745 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2746 method->GetEntryPointFromQuickCompiledCode(), 2747 method->GetEntryPointFromPortableCompiledCode(), 2748 have_portable_code); 2749} 2750 2751 2752 2753void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2754 const DexFile::ClassDef& dex_class_def, 2755 Handle<mirror::Class> klass, 2756 mirror::ClassLoader* class_loader) { 2757 CHECK(klass.Get() != nullptr); 2758 CHECK(klass->GetDexCache() != nullptr); 2759 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2760 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2761 CHECK(descriptor != nullptr); 2762 2763 klass->SetClass(GetClassRoot(kJavaLangClass)); 2764 if (kUseBakerOrBrooksReadBarrier) { 2765 klass->AssertReadBarrierPointer(); 2766 } 2767 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2768 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2769 klass->SetAccessFlags(access_flags); 2770 klass->SetClassLoader(class_loader); 2771 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2772 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2773 2774 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2775 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2776 2777 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2778 if (class_data == nullptr) { 2779 return; // no fields or methods - for example a marker interface 2780 } 2781 2782 2783 bool has_oat_class = false; 2784 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2785 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2786 &has_oat_class); 2787 if (has_oat_class) { 2788 LoadClassMembers(self, dex_file, class_data, klass, class_loader, &oat_class); 2789 } 2790 } 2791 if (!has_oat_class) { 2792 LoadClassMembers(self, dex_file, class_data, klass, class_loader, nullptr); 2793 } 2794} 2795 2796void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2797 const uint8_t* class_data, 2798 Handle<mirror::Class> klass, 2799 mirror::ClassLoader* class_loader, 2800 const OatFile::OatClass* oat_class) { 2801 // Load fields. 2802 ClassDataItemIterator it(dex_file, class_data); 2803 if (it.NumStaticFields() != 0) { 2804 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2805 if (UNLIKELY(statics == nullptr)) { 2806 CHECK(self->IsExceptionPending()); // OOME. 2807 return; 2808 } 2809 klass->SetSFields(statics); 2810 } 2811 if (it.NumInstanceFields() != 0) { 2812 mirror::ObjectArray<mirror::ArtField>* fields = 2813 AllocArtFieldArray(self, it.NumInstanceFields()); 2814 if (UNLIKELY(fields == nullptr)) { 2815 CHECK(self->IsExceptionPending()); // OOME. 2816 return; 2817 } 2818 klass->SetIFields(fields); 2819 } 2820 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2821 self->AllowThreadSuspension(); 2822 StackHandleScope<1> hs(self); 2823 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2824 if (UNLIKELY(sfield.Get() == nullptr)) { 2825 CHECK(self->IsExceptionPending()); // OOME. 2826 return; 2827 } 2828 klass->SetStaticField(i, sfield.Get()); 2829 LoadField(dex_file, it, klass, sfield); 2830 } 2831 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2832 self->AllowThreadSuspension(); 2833 StackHandleScope<1> hs(self); 2834 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2835 if (UNLIKELY(ifield.Get() == nullptr)) { 2836 CHECK(self->IsExceptionPending()); // OOME. 2837 return; 2838 } 2839 klass->SetInstanceField(i, ifield.Get()); 2840 LoadField(dex_file, it, klass, ifield); 2841 } 2842 2843 // Load methods. 2844 if (it.NumDirectMethods() != 0) { 2845 // TODO: append direct methods to class object 2846 mirror::ObjectArray<mirror::ArtMethod>* directs = 2847 AllocArtMethodArray(self, it.NumDirectMethods()); 2848 if (UNLIKELY(directs == nullptr)) { 2849 CHECK(self->IsExceptionPending()); // OOME. 2850 return; 2851 } 2852 klass->SetDirectMethods(directs); 2853 } 2854 if (it.NumVirtualMethods() != 0) { 2855 // TODO: append direct methods to class object 2856 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2857 AllocArtMethodArray(self, it.NumVirtualMethods()); 2858 if (UNLIKELY(virtuals == nullptr)) { 2859 CHECK(self->IsExceptionPending()); // OOME. 2860 return; 2861 } 2862 klass->SetVirtualMethods(virtuals); 2863 } 2864 size_t class_def_method_index = 0; 2865 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2866 size_t last_class_def_method_index = 0; 2867 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2868 self->AllowThreadSuspension(); 2869 StackHandleScope<1> hs(self); 2870 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2871 if (UNLIKELY(method.Get() == nullptr)) { 2872 CHECK(self->IsExceptionPending()); // OOME. 2873 return; 2874 } 2875 klass->SetDirectMethod(i, method.Get()); 2876 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2877 uint32_t it_method_index = it.GetMemberIndex(); 2878 if (last_dex_method_index == it_method_index) { 2879 // duplicate case 2880 method->SetMethodIndex(last_class_def_method_index); 2881 } else { 2882 method->SetMethodIndex(class_def_method_index); 2883 last_dex_method_index = it_method_index; 2884 last_class_def_method_index = class_def_method_index; 2885 } 2886 class_def_method_index++; 2887 } 2888 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2889 self->AllowThreadSuspension(); 2890 StackHandleScope<1> hs(self); 2891 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2892 if (UNLIKELY(method.Get() == nullptr)) { 2893 CHECK(self->IsExceptionPending()); // OOME. 2894 return; 2895 } 2896 klass->SetVirtualMethod(i, method.Get()); 2897 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2898 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2899 class_def_method_index++; 2900 } 2901 DCHECK(!it.HasNext()); 2902} 2903 2904void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2905 Handle<mirror::Class> klass, 2906 Handle<mirror::ArtField> dst) { 2907 uint32_t field_idx = it.GetMemberIndex(); 2908 dst->SetDexFieldIndex(field_idx); 2909 dst->SetDeclaringClass(klass.Get()); 2910 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2911} 2912 2913mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2914 const ClassDataItemIterator& it, 2915 Handle<mirror::Class> klass) { 2916 uint32_t dex_method_idx = it.GetMemberIndex(); 2917 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2918 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2919 2920 mirror::ArtMethod* dst = AllocArtMethod(self); 2921 if (UNLIKELY(dst == nullptr)) { 2922 CHECK(self->IsExceptionPending()); // OOME. 2923 return nullptr; 2924 } 2925 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2926 2927 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2928 dst->SetDexMethodIndex(dex_method_idx); 2929 dst->SetDeclaringClass(klass.Get()); 2930 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2931 2932 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2933 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2934 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2935 2936 uint32_t access_flags = it.GetMethodAccessFlags(); 2937 2938 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2939 // Set finalizable flag on declaring class. 2940 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2941 // Void return type. 2942 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2943 klass->SetFinalizable(); 2944 } else { 2945 std::string temp; 2946 const char* klass_descriptor = klass->GetDescriptor(&temp); 2947 // The Enum class declares a "final" finalize() method to prevent subclasses from 2948 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2949 // subclasses, so we exclude it here. 2950 // We also want to avoid setting the flag on Object, where we know that finalize() is 2951 // empty. 2952 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2953 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2954 klass->SetFinalizable(); 2955 } 2956 } 2957 } 2958 } else if (method_name[0] == '<') { 2959 // Fix broken access flags for initializers. Bug 11157540. 2960 bool is_init = (strcmp("<init>", method_name) == 0); 2961 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2962 if (UNLIKELY(!is_init && !is_clinit)) { 2963 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2964 } else { 2965 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2966 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2967 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2968 access_flags |= kAccConstructor; 2969 } 2970 } 2971 } 2972 dst->SetAccessFlags(access_flags); 2973 2974 return dst; 2975} 2976 2977void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2978 StackHandleScope<1> hs(self); 2979 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2980 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2981 << dex_file.GetLocation(); 2982 AppendToBootClassPath(dex_file, dex_cache); 2983} 2984 2985void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2986 Handle<mirror::DexCache> dex_cache) { 2987 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2988 boot_class_path_.push_back(&dex_file); 2989 RegisterDexFile(dex_file, dex_cache); 2990} 2991 2992bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2993 dex_lock_.AssertSharedHeld(Thread::Current()); 2994 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2995 mirror::DexCache* dex_cache = GetDexCache(i); 2996 if (dex_cache->GetDexFile() == &dex_file) { 2997 return true; 2998 } 2999 } 3000 return false; 3001} 3002 3003bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3004 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3005 return IsDexFileRegisteredLocked(dex_file); 3006} 3007 3008void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3009 Handle<mirror::DexCache> dex_cache) { 3010 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3011 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3012 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3013 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3014 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3015 dex_cache->SetDexFile(&dex_file); 3016 if (log_new_dex_caches_roots_) { 3017 // TODO: This is not safe if we can remove dex caches. 3018 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3019 } 3020} 3021 3022void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3023 Thread* self = Thread::Current(); 3024 { 3025 ReaderMutexLock mu(self, dex_lock_); 3026 if (IsDexFileRegisteredLocked(dex_file)) { 3027 return; 3028 } 3029 } 3030 // Don't alloc while holding the lock, since allocation may need to 3031 // suspend all threads and another thread may need the dex_lock_ to 3032 // get to a suspend point. 3033 StackHandleScope<1> hs(self); 3034 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3035 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3036 << dex_file.GetLocation(); 3037 { 3038 WriterMutexLock mu(self, dex_lock_); 3039 if (IsDexFileRegisteredLocked(dex_file)) { 3040 return; 3041 } 3042 RegisterDexFileLocked(dex_file, dex_cache); 3043 } 3044} 3045 3046void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3047 Handle<mirror::DexCache> dex_cache) { 3048 WriterMutexLock mu(Thread::Current(), dex_lock_); 3049 RegisterDexFileLocked(dex_file, dex_cache); 3050} 3051 3052mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3053 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3054 // Search assuming unique-ness of dex file. 3055 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3056 mirror::DexCache* dex_cache = GetDexCache(i); 3057 if (dex_cache->GetDexFile() == &dex_file) { 3058 return dex_cache; 3059 } 3060 } 3061 // Search matching by location name. 3062 std::string location(dex_file.GetLocation()); 3063 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3064 mirror::DexCache* dex_cache = GetDexCache(i); 3065 if (dex_cache->GetDexFile()->GetLocation() == location) { 3066 return dex_cache; 3067 } 3068 } 3069 // Failure, dump diagnostic and abort. 3070 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3071 mirror::DexCache* dex_cache = GetDexCache(i); 3072 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3073 } 3074 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3075 return nullptr; 3076} 3077 3078void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3079 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3080 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3081 mirror::DexCache* dex_cache = GetDexCache(i); 3082 dex_cache->Fixup(resolution_method); 3083 } 3084} 3085 3086mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3087 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3088 if (UNLIKELY(klass == nullptr)) { 3089 return nullptr; 3090 } 3091 return InitializePrimitiveClass(klass, type); 3092} 3093 3094mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3095 Primitive::Type type) { 3096 CHECK(primitive_class != nullptr); 3097 // Must hold lock on object when initializing. 3098 Thread* self = Thread::Current(); 3099 StackHandleScope<1> hs(self); 3100 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3101 ObjectLock<mirror::Class> lock(self, h_class); 3102 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3103 primitive_class->SetPrimitiveType(type); 3104 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3105 const char* descriptor = Primitive::Descriptor(type); 3106 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3107 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3108 return primitive_class; 3109} 3110 3111// Create an array class (i.e. the class object for the array, not the 3112// array itself). "descriptor" looks like "[C" or "[[[[B" or 3113// "[Ljava/lang/String;". 3114// 3115// If "descriptor" refers to an array of primitives, look up the 3116// primitive type's internally-generated class object. 3117// 3118// "class_loader" is the class loader of the class that's referring to 3119// us. It's used to ensure that we're looking for the element type in 3120// the right context. It does NOT become the class loader for the 3121// array class; that always comes from the base element class. 3122// 3123// Returns nullptr with an exception raised on failure. 3124mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3125 Handle<mirror::ClassLoader> class_loader) { 3126 // Identify the underlying component type 3127 CHECK_EQ('[', descriptor[0]); 3128 StackHandleScope<2> hs(self); 3129 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3130 class_loader))); 3131 if (component_type.Get() == nullptr) { 3132 DCHECK(self->IsExceptionPending()); 3133 // We need to accept erroneous classes as component types. 3134 component_type.Assign(LookupClass(self, descriptor + 1, class_loader.Get())); 3135 if (component_type.Get() == nullptr) { 3136 DCHECK(self->IsExceptionPending()); 3137 return nullptr; 3138 } else { 3139 self->ClearException(); 3140 } 3141 } 3142 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3143 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3144 return nullptr; 3145 } 3146 // See if the component type is already loaded. Array classes are 3147 // always associated with the class loader of their underlying 3148 // element type -- an array of Strings goes with the loader for 3149 // java/lang/String -- so we need to look for it there. (The 3150 // caller should have checked for the existence of the class 3151 // before calling here, but they did so with *their* class loader, 3152 // not the component type's loader.) 3153 // 3154 // If we find it, the caller adds "loader" to the class' initiating 3155 // loader list, which should prevent us from going through this again. 3156 // 3157 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3158 // are the same, because our caller (FindClass) just did the 3159 // lookup. (Even if we get this wrong we still have correct behavior, 3160 // because we effectively do this lookup again when we add the new 3161 // class to the hash table --- necessary because of possible races with 3162 // other threads.) 3163 if (class_loader.Get() != component_type->GetClassLoader()) { 3164 mirror::Class* new_class = LookupClass(self, descriptor, component_type->GetClassLoader()); 3165 if (new_class != nullptr) { 3166 return new_class; 3167 } 3168 } 3169 3170 // Fill out the fields in the Class. 3171 // 3172 // It is possible to execute some methods against arrays, because 3173 // all arrays are subclasses of java_lang_Object_, so we need to set 3174 // up a vtable. We can just point at the one in java_lang_Object_. 3175 // 3176 // Array classes are simple enough that we don't need to do a full 3177 // link step. 3178 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3179 if (UNLIKELY(!init_done_)) { 3180 // Classes that were hand created, ie not by FindSystemClass 3181 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3182 new_class.Assign(GetClassRoot(kClassArrayClass)); 3183 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3184 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3185 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3186 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3187 } else if (strcmp(descriptor, 3188 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3189 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3190 } else if (strcmp(descriptor, 3191 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3192 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3193 } else if (strcmp(descriptor, "[C") == 0) { 3194 new_class.Assign(GetClassRoot(kCharArrayClass)); 3195 } else if (strcmp(descriptor, "[I") == 0) { 3196 new_class.Assign(GetClassRoot(kIntArrayClass)); 3197 } 3198 } 3199 if (new_class.Get() == nullptr) { 3200 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3201 if (new_class.Get() == nullptr) { 3202 return nullptr; 3203 } 3204 new_class->SetComponentType(component_type.Get()); 3205 } 3206 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3207 DCHECK(new_class->GetComponentType() != nullptr); 3208 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3209 new_class->SetSuperClass(java_lang_Object); 3210 new_class->SetVTable(java_lang_Object->GetVTable()); 3211 new_class->SetPrimitiveType(Primitive::kPrimNot); 3212 new_class->SetClassLoader(component_type->GetClassLoader()); 3213 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3214 new_class->PopulateEmbeddedImtAndVTable(); 3215 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3216 // don't need to set new_class->SetObjectSize(..) 3217 // because Object::SizeOf delegates to Array::SizeOf 3218 3219 3220 // All arrays have java/lang/Cloneable and java/io/Serializable as 3221 // interfaces. We need to set that up here, so that stuff like 3222 // "instanceof" works right. 3223 // 3224 // Note: The GC could run during the call to FindSystemClass, 3225 // so we need to make sure the class object is GC-valid while we're in 3226 // there. Do this by clearing the interface list so the GC will just 3227 // think that the entries are null. 3228 3229 3230 // Use the single, global copies of "interfaces" and "iftable" 3231 // (remember not to free them for arrays). 3232 { 3233 mirror::IfTable* array_iftable = array_iftable_.Read(); 3234 CHECK(array_iftable != nullptr); 3235 new_class->SetIfTable(array_iftable); 3236 } 3237 3238 // Inherit access flags from the component type. 3239 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3240 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3241 access_flags &= kAccJavaFlagsMask; 3242 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3243 // and remove "interface". 3244 access_flags |= kAccAbstract | kAccFinal; 3245 access_flags &= ~kAccInterface; 3246 3247 new_class->SetAccessFlags(access_flags); 3248 3249 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3250 if (existing == nullptr) { 3251 return new_class.Get(); 3252 } 3253 // Another thread must have loaded the class after we 3254 // started but before we finished. Abandon what we've 3255 // done. 3256 // 3257 // (Yes, this happens.) 3258 3259 return existing; 3260} 3261 3262mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3263 switch (type) { 3264 case 'B': 3265 return GetClassRoot(kPrimitiveByte); 3266 case 'C': 3267 return GetClassRoot(kPrimitiveChar); 3268 case 'D': 3269 return GetClassRoot(kPrimitiveDouble); 3270 case 'F': 3271 return GetClassRoot(kPrimitiveFloat); 3272 case 'I': 3273 return GetClassRoot(kPrimitiveInt); 3274 case 'J': 3275 return GetClassRoot(kPrimitiveLong); 3276 case 'S': 3277 return GetClassRoot(kPrimitiveShort); 3278 case 'Z': 3279 return GetClassRoot(kPrimitiveBoolean); 3280 case 'V': 3281 return GetClassRoot(kPrimitiveVoid); 3282 default: 3283 break; 3284 } 3285 std::string printable_type(PrintableChar(type)); 3286 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3287 return nullptr; 3288} 3289 3290mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3291 size_t hash) { 3292 if (VLOG_IS_ON(class_linker)) { 3293 mirror::DexCache* dex_cache = klass->GetDexCache(); 3294 std::string source; 3295 if (dex_cache != nullptr) { 3296 source += " from "; 3297 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3298 } 3299 LOG(INFO) << "Loaded class " << descriptor << source; 3300 } 3301 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3302 mirror::Class* existing = 3303 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3304 if (existing != nullptr) { 3305 return existing; 3306 } 3307 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3308 dex_cache_image_class_lookup_required_) { 3309 // Check a class loaded with the system class loader matches one in the image if the class 3310 // is in the image. 3311 existing = LookupClassFromImage(descriptor); 3312 if (existing != nullptr) { 3313 CHECK(klass == existing); 3314 } 3315 } 3316 VerifyObject(klass); 3317 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3318 if (log_new_class_table_roots_) { 3319 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3320 } 3321 return nullptr; 3322} 3323 3324mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3325 size_t hash) { 3326 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3327 mirror::Class* existing = 3328 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3329 3330 if (existing == nullptr) { 3331 CHECK(klass->IsProxyClass()); 3332 return nullptr; 3333 } 3334 3335 CHECK_NE(existing, klass) << descriptor; 3336 CHECK(!existing->IsResolved()) << descriptor; 3337 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3338 3339 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3340 it != end && it->first == hash; ++it) { 3341 mirror::Class* klass = it->second.Read(); 3342 if (klass == existing) { 3343 class_table_.erase(it); 3344 break; 3345 } 3346 } 3347 3348 CHECK(!klass->IsTemp()) << descriptor; 3349 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3350 dex_cache_image_class_lookup_required_) { 3351 // Check a class loaded with the system class loader matches one in the image if the class 3352 // is in the image. 3353 existing = LookupClassFromImage(descriptor); 3354 if (existing != nullptr) { 3355 CHECK(klass == existing) << descriptor; 3356 } 3357 } 3358 VerifyObject(klass); 3359 3360 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3361 if (log_new_class_table_roots_) { 3362 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3363 } 3364 3365 return existing; 3366} 3367 3368bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3369 size_t hash = Hash(descriptor); 3370 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3371 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3372 it != end && it->first == hash; 3373 ++it) { 3374 mirror::Class* klass = it->second.Read(); 3375 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3376 class_table_.erase(it); 3377 return true; 3378 } 3379 } 3380 return false; 3381} 3382 3383mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, 3384 const mirror::ClassLoader* class_loader) { 3385 size_t hash = Hash(descriptor); 3386 { 3387 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3388 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3389 if (result != nullptr) { 3390 return result; 3391 } 3392 } 3393 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3394 return nullptr; 3395 } else { 3396 // Lookup failed but need to search dex_caches_. 3397 mirror::Class* result = LookupClassFromImage(descriptor); 3398 if (result != nullptr) { 3399 InsertClass(descriptor, result, hash); 3400 } else { 3401 // Searching the image dex files/caches failed, we don't want to get into this situation 3402 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3403 // classes into the class table. 3404 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3405 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3406 MoveImageClassesToClassTable(); 3407 } 3408 } 3409 return result; 3410 } 3411} 3412 3413mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3414 const mirror::ClassLoader* class_loader, 3415 size_t hash) { 3416 auto end = class_table_.end(); 3417 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3418 mirror::Class* klass = it->second.Read(); 3419 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3420 if (kIsDebugBuild) { 3421 // Check for duplicates in the table. 3422 for (++it; it != end && it->first == hash; ++it) { 3423 mirror::Class* klass2 = it->second.Read(); 3424 CHECK(!(klass2->GetClassLoader() == class_loader && 3425 klass2->DescriptorEquals(descriptor))) 3426 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3427 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3428 } 3429 } 3430 return klass; 3431 } 3432 } 3433 return nullptr; 3434} 3435 3436static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3437 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3438 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3439 CHECK(image != nullptr); 3440 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3441 return root->AsObjectArray<mirror::DexCache>(); 3442} 3443 3444void ClassLinker::MoveImageClassesToClassTable() { 3445 Thread* self = Thread::Current(); 3446 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3447 if (!dex_cache_image_class_lookup_required_) { 3448 return; // All dex cache classes are already in the class table. 3449 } 3450 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3451 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3452 std::string temp; 3453 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3454 mirror::DexCache* dex_cache = dex_caches->Get(i); 3455 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3456 for (int32_t j = 0; j < types->GetLength(); j++) { 3457 mirror::Class* klass = types->Get(j); 3458 if (klass != nullptr) { 3459 DCHECK(klass->GetClassLoader() == nullptr); 3460 const char* descriptor = klass->GetDescriptor(&temp); 3461 size_t hash = Hash(descriptor); 3462 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3463 if (existing != nullptr) { 3464 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3465 << PrettyClassAndClassLoader(klass); 3466 } else { 3467 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3468 if (log_new_class_table_roots_) { 3469 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3470 } 3471 } 3472 } 3473 } 3474 } 3475 dex_cache_image_class_lookup_required_ = false; 3476} 3477 3478mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3479 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3480 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3481 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3482 mirror::DexCache* dex_cache = dex_caches->Get(i); 3483 const DexFile* dex_file = dex_cache->GetDexFile(); 3484 // Try binary searching the string/type index. 3485 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3486 if (string_id != nullptr) { 3487 const DexFile::TypeId* type_id = 3488 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3489 if (type_id != nullptr) { 3490 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3491 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3492 if (klass != nullptr) { 3493 return klass; 3494 } 3495 } 3496 } 3497 } 3498 return nullptr; 3499} 3500 3501void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3502 result.clear(); 3503 if (dex_cache_image_class_lookup_required_) { 3504 MoveImageClassesToClassTable(); 3505 } 3506 size_t hash = Hash(descriptor); 3507 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3508 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3509 it != end && it->first == hash; ++it) { 3510 mirror::Class* klass = it->second.Read(); 3511 if (klass->DescriptorEquals(descriptor)) { 3512 result.push_back(klass); 3513 } 3514 } 3515} 3516 3517void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3518 // TODO: assert that the monitor on the Class is held 3519 ObjectLock<mirror::Class> lock(self, klass); 3520 3521 // Don't attempt to re-verify if already sufficiently verified. 3522 if (klass->IsVerified()) { 3523 EnsurePreverifiedMethods(klass); 3524 return; 3525 } 3526 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3527 return; 3528 } 3529 3530 // The class might already be erroneous, for example at compile time if we attempted to verify 3531 // this class as a parent to another. 3532 if (klass->IsErroneous()) { 3533 ThrowEarlierClassFailure(klass.Get()); 3534 return; 3535 } 3536 3537 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3538 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3539 } else { 3540 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3541 << PrettyClass(klass.Get()); 3542 CHECK(!Runtime::Current()->IsCompiler()); 3543 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3544 } 3545 3546 // Skip verification if disabled. 3547 if (!Runtime::Current()->IsVerificationEnabled()) { 3548 klass->SetStatus(mirror::Class::kStatusVerified, self); 3549 EnsurePreverifiedMethods(klass); 3550 return; 3551 } 3552 3553 // Verify super class. 3554 StackHandleScope<2> hs(self); 3555 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3556 if (super.Get() != nullptr) { 3557 // Acquire lock to prevent races on verifying the super class. 3558 ObjectLock<mirror::Class> lock(self, super); 3559 3560 if (!super->IsVerified() && !super->IsErroneous()) { 3561 VerifyClass(self, super); 3562 } 3563 if (!super->IsCompileTimeVerified()) { 3564 std::string error_msg( 3565 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3566 PrettyDescriptor(klass.Get()).c_str(), 3567 PrettyDescriptor(super.Get()).c_str())); 3568 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3569 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3570 if (cause.Get() != nullptr) { 3571 self->ClearException(); 3572 } 3573 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3574 if (cause.Get() != nullptr) { 3575 self->GetException(nullptr)->SetCause(cause.Get()); 3576 } 3577 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3578 if (Runtime::Current()->IsCompiler()) { 3579 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3580 } 3581 klass->SetStatus(mirror::Class::kStatusError, self); 3582 return; 3583 } 3584 } 3585 3586 // Try to use verification information from the oat file, otherwise do runtime verification. 3587 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3588 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3589 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3590 if (oat_file_class_status == mirror::Class::kStatusError) { 3591 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3592 << PrettyDescriptor(klass.Get()) << " in " 3593 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3594 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3595 PrettyDescriptor(klass.Get()).c_str()); 3596 klass->SetStatus(mirror::Class::kStatusError, self); 3597 return; 3598 } 3599 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3600 std::string error_msg; 3601 if (!preverified) { 3602 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3603 Runtime::Current()->IsCompiler(), 3604 &error_msg); 3605 } 3606 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3607 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3608 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3609 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3610 << " because: " << error_msg; 3611 } 3612 self->AssertNoPendingException(); 3613 // Make sure all classes referenced by catch blocks are resolved. 3614 ResolveClassExceptionHandlerTypes(dex_file, klass); 3615 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3616 // Even though there were no verifier failures we need to respect whether the super-class 3617 // was verified or requiring runtime reverification. 3618 if (super.Get() == nullptr || super->IsVerified()) { 3619 klass->SetStatus(mirror::Class::kStatusVerified, self); 3620 } else { 3621 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3622 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3623 // Pretend a soft failure occured so that we don't consider the class verified below. 3624 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3625 } 3626 } else { 3627 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3628 // Soft failures at compile time should be retried at runtime. Soft 3629 // failures at runtime will be handled by slow paths in the generated 3630 // code. Set status accordingly. 3631 if (Runtime::Current()->IsCompiler()) { 3632 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3633 } else { 3634 klass->SetStatus(mirror::Class::kStatusVerified, self); 3635 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3636 // later. 3637 klass->SetPreverified(); 3638 } 3639 } 3640 } else { 3641 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3642 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3643 << " because: " << error_msg; 3644 self->AssertNoPendingException(); 3645 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3646 klass->SetStatus(mirror::Class::kStatusError, self); 3647 } 3648 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3649 // Class is verified so we don't need to do any access check on its methods. 3650 // Let the interpreter know it by setting the kAccPreverified flag onto each 3651 // method. 3652 // Note: we're going here during compilation and at runtime. When we set the 3653 // kAccPreverified flag when compiling image classes, the flag is recorded 3654 // in the image and is set when loading the image. 3655 EnsurePreverifiedMethods(klass); 3656 } 3657} 3658 3659void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3660 if (!klass->IsPreverified()) { 3661 klass->SetPreverifiedFlagOnAllMethods(); 3662 klass->SetPreverified(); 3663 } 3664} 3665 3666bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3667 mirror::Class::Status& oat_file_class_status) { 3668 // If we're compiling, we can only verify the class using the oat file if 3669 // we are not compiling the image or if the class we're verifying is not part of 3670 // the app. In other words, we will only check for preverification of bootclasspath 3671 // classes. 3672 if (Runtime::Current()->IsCompiler()) { 3673 // Are we compiling the bootclasspath? 3674 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3675 return false; 3676 } 3677 // We are compiling an app (not the image). 3678 3679 // Is this an app class? (I.e. not a bootclasspath class) 3680 if (klass->GetClassLoader() != nullptr) { 3681 return false; 3682 } 3683 } 3684 3685 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3686 // In case we run without an image there won't be a backing oat file. 3687 if (oat_dex_file == nullptr) { 3688 return false; 3689 } 3690 3691 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3692 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3693 if (oat_file_class_status == mirror::Class::kStatusVerified || 3694 oat_file_class_status == mirror::Class::kStatusInitialized) { 3695 return true; 3696 } 3697 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3698 // Compile time verification failed with a soft error. Compile time verification can fail 3699 // because we have incomplete type information. Consider the following: 3700 // class ... { 3701 // Foo x; 3702 // .... () { 3703 // if (...) { 3704 // v1 gets assigned a type of resolved class Foo 3705 // } else { 3706 // v1 gets assigned a type of unresolved class Bar 3707 // } 3708 // iput x = v1 3709 // } } 3710 // when we merge v1 following the if-the-else it results in Conflict 3711 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3712 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3713 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3714 // at compile time). 3715 return false; 3716 } 3717 if (oat_file_class_status == mirror::Class::kStatusError) { 3718 // Compile time verification failed with a hard error. This is caused by invalid instructions 3719 // in the class. These errors are unrecoverable. 3720 return false; 3721 } 3722 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3723 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3724 // not loading the class. 3725 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3726 // isn't a problem and this case shouldn't occur 3727 return false; 3728 } 3729 std::string temp; 3730 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3731 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3732 << klass->GetDescriptor(&temp); 3733 3734 return false; 3735} 3736 3737void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3738 Handle<mirror::Class> klass) { 3739 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3740 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3741 } 3742 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3743 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3744 } 3745} 3746 3747void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3748 mirror::ArtMethod* method) { 3749 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3750 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3751 if (code_item == nullptr) { 3752 return; // native or abstract method 3753 } 3754 if (code_item->tries_size_ == 0) { 3755 return; // nothing to process 3756 } 3757 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3758 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3759 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3760 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3761 CatchHandlerIterator iterator(handlers_ptr); 3762 for (; iterator.HasNext(); iterator.Next()) { 3763 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3764 // unresolved exception types will be ignored by exception delivery 3765 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3766 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3767 if (exception_type == nullptr) { 3768 DCHECK(Thread::Current()->IsExceptionPending()); 3769 Thread::Current()->ClearException(); 3770 } 3771 } 3772 } 3773 handlers_ptr = iterator.EndDataPointer(); 3774 } 3775} 3776 3777static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3778static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3779 Handle<mirror::ArtMethod> prototype); 3780 3781mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3782 jobjectArray interfaces, jobject loader, 3783 jobjectArray methods, jobjectArray throws) { 3784 Thread* self = soa.Self(); 3785 StackHandleScope<8> hs(self); 3786 MutableHandle<mirror::Class> klass(hs.NewHandle( 3787 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3788 if (klass.Get() == nullptr) { 3789 CHECK(self->IsExceptionPending()); // OOME. 3790 return nullptr; 3791 } 3792 DCHECK(klass->GetClass() != nullptr); 3793 klass->SetObjectSize(sizeof(mirror::Proxy)); 3794 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3795 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3796 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3797 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3798 klass->SetName(soa.Decode<mirror::String*>(name)); 3799 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3800 klass->SetDexCache(proxy_class->GetDexCache()); 3801 klass->SetStatus(mirror::Class::kStatusIdx, self); 3802 3803 // Instance fields are inherited, but we add a couple of static fields... 3804 { 3805 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3806 if (UNLIKELY(sfields == nullptr)) { 3807 CHECK(self->IsExceptionPending()); // OOME. 3808 return nullptr; 3809 } 3810 klass->SetSFields(sfields); 3811 } 3812 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3813 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3814 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3815 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3816 CHECK(self->IsExceptionPending()); // OOME. 3817 return nullptr; 3818 } 3819 klass->SetStaticField(0, interfaces_sfield.Get()); 3820 interfaces_sfield->SetDexFieldIndex(0); 3821 interfaces_sfield->SetDeclaringClass(klass.Get()); 3822 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3823 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3824 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3825 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3826 CHECK(self->IsExceptionPending()); // OOME. 3827 return nullptr; 3828 } 3829 klass->SetStaticField(1, throws_sfield.Get()); 3830 throws_sfield->SetDexFieldIndex(1); 3831 throws_sfield->SetDeclaringClass(klass.Get()); 3832 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3833 3834 // Proxies have 1 direct method, the constructor 3835 { 3836 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3837 if (UNLIKELY(directs == nullptr)) { 3838 CHECK(self->IsExceptionPending()); // OOME. 3839 return nullptr; 3840 } 3841 klass->SetDirectMethods(directs); 3842 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3843 if (UNLIKELY(constructor == nullptr)) { 3844 CHECK(self->IsExceptionPending()); // OOME. 3845 return nullptr; 3846 } 3847 klass->SetDirectMethod(0, constructor); 3848 } 3849 3850 // Create virtual method using specified prototypes. 3851 size_t num_virtual_methods = 3852 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3853 { 3854 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3855 num_virtual_methods); 3856 if (UNLIKELY(virtuals == nullptr)) { 3857 CHECK(self->IsExceptionPending()); // OOME. 3858 return nullptr; 3859 } 3860 klass->SetVirtualMethods(virtuals); 3861 } 3862 for (size_t i = 0; i < num_virtual_methods; ++i) { 3863 StackHandleScope<1> hs(self); 3864 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3865 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3866 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3867 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3868 if (UNLIKELY(clone == nullptr)) { 3869 CHECK(self->IsExceptionPending()); // OOME. 3870 return nullptr; 3871 } 3872 klass->SetVirtualMethod(i, clone); 3873 } 3874 3875 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3876 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3877 self->AssertNoPendingException(); 3878 3879 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3880 mirror::Class* new_class = nullptr; 3881 { 3882 // Must hold lock on object when resolved. 3883 ObjectLock<mirror::Class> resolution_lock(self, klass); 3884 // Link the fields and virtual methods, creating vtable and iftables 3885 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3886 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3887 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3888 klass->SetStatus(mirror::Class::kStatusError, self); 3889 return nullptr; 3890 } 3891 } 3892 3893 CHECK(klass->IsRetired()); 3894 CHECK_NE(klass.Get(), new_class); 3895 klass.Assign(new_class); 3896 3897 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3898 interfaces_sfield->SetObject<false>(klass.Get(), 3899 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3900 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3901 throws_sfield->SetObject<false>(klass.Get(), 3902 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3903 3904 { 3905 // Lock on klass is released. Lock new class object. 3906 ObjectLock<mirror::Class> initialization_lock(self, klass); 3907 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3908 } 3909 3910 // sanity checks 3911 if (kIsDebugBuild) { 3912 CHECK(klass->GetIFields() == nullptr); 3913 CheckProxyConstructor(klass->GetDirectMethod(0)); 3914 for (size_t i = 0; i < num_virtual_methods; ++i) { 3915 StackHandleScope<2> hs(self); 3916 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3917 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3918 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3919 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3920 CheckProxyMethod(virtual_method, prototype); 3921 } 3922 3923 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3924 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3925 decoded_name->ToModifiedUtf8().c_str())); 3926 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3927 3928 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3929 decoded_name->ToModifiedUtf8().c_str())); 3930 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3931 3932 CHECK_EQ(klass.Get()->GetInterfaces(), 3933 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3934 CHECK_EQ(klass.Get()->GetThrows(), 3935 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3936 } 3937 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3938 CHECK(existing == nullptr); 3939 return klass.Get(); 3940} 3941 3942std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3943 DCHECK(proxy_class->IsProxyClass()); 3944 mirror::String* name = proxy_class->GetName(); 3945 DCHECK(name != nullptr); 3946 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3947} 3948 3949mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3950 mirror::ArtMethod* proxy_method) { 3951 DCHECK(proxy_class->IsProxyClass()); 3952 DCHECK(proxy_method->IsProxyMethod()); 3953 // Locate the dex cache of the original interface/Object 3954 mirror::DexCache* dex_cache = nullptr; 3955 { 3956 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3957 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3958 mirror::DexCache* a_dex_cache = GetDexCache(i); 3959 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3960 dex_cache = a_dex_cache; 3961 break; 3962 } 3963 } 3964 } 3965 CHECK(dex_cache != nullptr); 3966 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3967 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3968 CHECK(resolved_method != nullptr); 3969 return resolved_method; 3970} 3971 3972 3973mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3974 Handle<mirror::Class> klass, 3975 mirror::Class* proxy_class) { 3976 // Create constructor for Proxy that must initialize h 3977 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3978 proxy_class->GetDirectMethods(); 3979 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3980 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3981 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3982 // constructor method. 3983 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3984 proxy_constructor); 3985 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3986 // code_ too) 3987 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3988 if (constructor == nullptr) { 3989 CHECK(self->IsExceptionPending()); // OOME. 3990 return nullptr; 3991 } 3992 // Make this constructor public and fix the class to be our Proxy version 3993 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3994 constructor->SetDeclaringClass(klass.Get()); 3995 return constructor; 3996} 3997 3998static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3999 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4000 CHECK(constructor->IsConstructor()); 4001 CHECK_STREQ(constructor->GetName(), "<init>"); 4002 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4003 "(Ljava/lang/reflect/InvocationHandler;)V"); 4004 DCHECK(constructor->IsPublic()); 4005} 4006 4007mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4008 Handle<mirror::Class> klass, 4009 Handle<mirror::ArtMethod> prototype) { 4010 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4011 // prototype method 4012 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4013 prototype.Get()); 4014 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4015 // as necessary 4016 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4017 if (UNLIKELY(method == nullptr)) { 4018 CHECK(self->IsExceptionPending()); // OOME. 4019 return nullptr; 4020 } 4021 4022 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4023 // the intersection of throw exceptions as defined in Proxy 4024 method->SetDeclaringClass(klass.Get()); 4025 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4026 4027 // At runtime the method looks like a reference and argument saving method, clone the code 4028 // related parameters from this method. 4029 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4030 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4031 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4032 4033 return method; 4034} 4035 4036static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4037 Handle<mirror::ArtMethod> prototype) 4038 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4039 // Basic sanity 4040 CHECK(!prototype->IsFinal()); 4041 CHECK(method->IsFinal()); 4042 CHECK(!method->IsAbstract()); 4043 4044 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4045 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4046 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4047 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4048 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4049 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4050 4051 StackHandleScope<2> hs(Thread::Current()); 4052 MethodHelper mh(hs.NewHandle(method.Get())); 4053 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4054 CHECK_STREQ(method->GetName(), prototype->GetName()); 4055 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4056 // More complex sanity - via dex cache 4057 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4058} 4059 4060static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4061 bool can_init_parents) 4062 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4063 if (can_init_statics && can_init_parents) { 4064 return true; 4065 } 4066 if (!can_init_statics) { 4067 // Check if there's a class initializer. 4068 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4069 if (clinit != nullptr) { 4070 return false; 4071 } 4072 // Check if there are encoded static values needing initialization. 4073 if (klass->NumStaticFields() != 0) { 4074 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4075 DCHECK(dex_class_def != nullptr); 4076 if (dex_class_def->static_values_off_ != 0) { 4077 return false; 4078 } 4079 } 4080 } 4081 if (!klass->IsInterface() && klass->HasSuperClass()) { 4082 mirror::Class* super_class = klass->GetSuperClass(); 4083 if (!can_init_parents && !super_class->IsInitialized()) { 4084 return false; 4085 } else { 4086 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4087 return false; 4088 } 4089 } 4090 } 4091 return true; 4092} 4093 4094bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4095 bool can_init_statics, bool can_init_parents) { 4096 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4097 4098 // Are we already initialized and therefore done? 4099 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4100 // an initialized class will never change its state. 4101 if (klass->IsInitialized()) { 4102 return true; 4103 } 4104 4105 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4106 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4107 return false; 4108 } 4109 4110 self->AllowThreadSuspension(); 4111 uint64_t t0; 4112 { 4113 ObjectLock<mirror::Class> lock(self, klass); 4114 4115 // Re-check under the lock in case another thread initialized ahead of us. 4116 if (klass->IsInitialized()) { 4117 return true; 4118 } 4119 4120 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4121 if (klass->IsErroneous()) { 4122 ThrowEarlierClassFailure(klass.Get()); 4123 VlogClassInitializationFailure(klass); 4124 return false; 4125 } 4126 4127 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4128 4129 if (!klass->IsVerified()) { 4130 VerifyClass(self, klass); 4131 if (!klass->IsVerified()) { 4132 // We failed to verify, expect either the klass to be erroneous or verification failed at 4133 // compile time. 4134 if (klass->IsErroneous()) { 4135 CHECK(self->IsExceptionPending()); 4136 VlogClassInitializationFailure(klass); 4137 } else { 4138 CHECK(Runtime::Current()->IsCompiler()); 4139 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4140 } 4141 return false; 4142 } else { 4143 self->AssertNoPendingException(); 4144 } 4145 } 4146 4147 // If the class is kStatusInitializing, either this thread is 4148 // initializing higher up the stack or another thread has beat us 4149 // to initializing and we need to wait. Either way, this 4150 // invocation of InitializeClass will not be responsible for 4151 // running <clinit> and will return. 4152 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4153 // Could have got an exception during verification. 4154 if (self->IsExceptionPending()) { 4155 VlogClassInitializationFailure(klass); 4156 return false; 4157 } 4158 // We caught somebody else in the act; was it us? 4159 if (klass->GetClinitThreadId() == self->GetTid()) { 4160 // Yes. That's fine. Return so we can continue initializing. 4161 return true; 4162 } 4163 // No. That's fine. Wait for another thread to finish initializing. 4164 return WaitForInitializeClass(klass, self, lock); 4165 } 4166 4167 if (!ValidateSuperClassDescriptors(klass)) { 4168 klass->SetStatus(mirror::Class::kStatusError, self); 4169 return false; 4170 } 4171 self->AllowThreadSuspension(); 4172 4173 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4174 4175 // From here out other threads may observe that we're initializing and so changes of state 4176 // require the a notification. 4177 klass->SetClinitThreadId(self->GetTid()); 4178 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4179 4180 t0 = NanoTime(); 4181 } 4182 4183 // Initialize super classes, must be done while initializing for the JLS. 4184 if (!klass->IsInterface() && klass->HasSuperClass()) { 4185 mirror::Class* super_class = klass->GetSuperClass(); 4186 if (!super_class->IsInitialized()) { 4187 CHECK(!super_class->IsInterface()); 4188 CHECK(can_init_parents); 4189 StackHandleScope<1> hs(self); 4190 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4191 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4192 if (!super_initialized) { 4193 // The super class was verified ahead of entering initializing, we should only be here if 4194 // the super class became erroneous due to initialization. 4195 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4196 << "Super class initialization failed for " 4197 << PrettyDescriptor(handle_scope_super.Get()) 4198 << " that has unexpected status " << handle_scope_super->GetStatus() 4199 << "\nPending exception:\n" 4200 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4201 ObjectLock<mirror::Class> lock(self, klass); 4202 // Initialization failed because the super-class is erroneous. 4203 klass->SetStatus(mirror::Class::kStatusError, self); 4204 return false; 4205 } 4206 } 4207 } 4208 4209 if (klass->NumStaticFields() > 0) { 4210 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4211 CHECK(dex_class_def != nullptr); 4212 const DexFile& dex_file = klass->GetDexFile(); 4213 StackHandleScope<3> hs(self); 4214 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4215 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4216 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4217 this, *dex_class_def); 4218 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4219 ClassDataItemIterator field_it(dex_file, class_data); 4220 if (value_it.HasNext()) { 4221 DCHECK(field_it.HasNextStaticField()); 4222 CHECK(can_init_statics); 4223 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4224 StackHandleScope<1> hs(self); 4225 Handle<mirror::ArtField> field(hs.NewHandle( 4226 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4227 if (Runtime::Current()->IsActiveTransaction()) { 4228 value_it.ReadValueToField<true>(field); 4229 } else { 4230 value_it.ReadValueToField<false>(field); 4231 } 4232 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4233 } 4234 } 4235 } 4236 4237 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4238 if (clinit != nullptr) { 4239 CHECK(can_init_statics); 4240 JValue result; 4241 clinit->Invoke(self, nullptr, 0, &result, "V"); 4242 } 4243 4244 self->AllowThreadSuspension(); 4245 uint64_t t1 = NanoTime(); 4246 4247 bool success = true; 4248 { 4249 ObjectLock<mirror::Class> lock(self, klass); 4250 4251 if (self->IsExceptionPending()) { 4252 WrapExceptionInInitializer(klass); 4253 klass->SetStatus(mirror::Class::kStatusError, self); 4254 success = false; 4255 } else { 4256 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4257 RuntimeStats* thread_stats = self->GetStats(); 4258 ++global_stats->class_init_count; 4259 ++thread_stats->class_init_count; 4260 global_stats->class_init_time_ns += (t1 - t0); 4261 thread_stats->class_init_time_ns += (t1 - t0); 4262 // Set the class as initialized except if failed to initialize static fields. 4263 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4264 if (VLOG_IS_ON(class_linker)) { 4265 std::string temp; 4266 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4267 klass->GetLocation(); 4268 } 4269 // Opportunistically set static method trampolines to their destination. 4270 FixupStaticTrampolines(klass.Get()); 4271 } 4272 } 4273 return success; 4274} 4275 4276bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4277 ObjectLock<mirror::Class>& lock) 4278 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4279 while (true) { 4280 self->AssertNoPendingException(); 4281 CHECK(!klass->IsInitialized()); 4282 lock.WaitIgnoringInterrupts(); 4283 4284 // When we wake up, repeat the test for init-in-progress. If 4285 // there's an exception pending (only possible if 4286 // we were not using WaitIgnoringInterrupts), bail out. 4287 if (self->IsExceptionPending()) { 4288 WrapExceptionInInitializer(klass); 4289 klass->SetStatus(mirror::Class::kStatusError, self); 4290 return false; 4291 } 4292 // Spurious wakeup? Go back to waiting. 4293 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4294 continue; 4295 } 4296 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4297 // Compile time initialization failed. 4298 return false; 4299 } 4300 if (klass->IsErroneous()) { 4301 // The caller wants an exception, but it was thrown in a 4302 // different thread. Synthesize one here. 4303 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4304 PrettyDescriptor(klass.Get()).c_str()); 4305 VlogClassInitializationFailure(klass); 4306 return false; 4307 } 4308 if (klass->IsInitialized()) { 4309 return true; 4310 } 4311 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4312 << klass->GetStatus(); 4313 } 4314 UNREACHABLE(); 4315} 4316 4317bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4318 if (klass->IsInterface()) { 4319 return true; 4320 } 4321 // Begin with the methods local to the superclass. 4322 StackHandleScope<2> hs(Thread::Current()); 4323 MutableMethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4324 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4325 if (klass->HasSuperClass() && 4326 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4327 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4328 mh.ChangeMethod(klass->GetVTableEntry(i)); 4329 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4330 if (mh.GetMethod() != super_mh.GetMethod() && 4331 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4332 ThrowLinkageError(klass.Get(), 4333 "Class %s method %s resolves differently in superclass %s", 4334 PrettyDescriptor(klass.Get()).c_str(), 4335 PrettyMethod(mh.GetMethod()).c_str(), 4336 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4337 return false; 4338 } 4339 } 4340 } 4341 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4342 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4343 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4344 for (uint32_t j = 0; j < num_methods; ++j) { 4345 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4346 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4347 if (mh.GetMethod() != super_mh.GetMethod() && 4348 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4349 ThrowLinkageError(klass.Get(), 4350 "Class %s method %s resolves differently in interface %s", 4351 PrettyDescriptor(klass.Get()).c_str(), 4352 PrettyMethod(mh.GetMethod()).c_str(), 4353 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4354 return false; 4355 } 4356 } 4357 } 4358 } 4359 return true; 4360} 4361 4362bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4363 bool can_init_parents) { 4364 DCHECK(c.Get() != nullptr); 4365 if (c->IsInitialized()) { 4366 EnsurePreverifiedMethods(c); 4367 return true; 4368 } 4369 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4370 if (!success) { 4371 if (can_init_fields && can_init_parents) { 4372 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4373 } 4374 } else { 4375 self->AssertNoPendingException(); 4376 } 4377 return success; 4378} 4379 4380void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4381 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4382 if (fields != nullptr) { 4383 for (int index = 0; index < fields->GetLength(); index ++) { 4384 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4385 fields->Get(index)->SetDeclaringClass(new_class); 4386 } 4387 } 4388 } 4389 4390 fields = new_class->GetSFields(); 4391 if (fields != nullptr) { 4392 for (int index = 0; index < fields->GetLength(); index ++) { 4393 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4394 fields->Get(index)->SetDeclaringClass(new_class); 4395 } 4396 } 4397 } 4398 4399 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4400 if (methods != nullptr) { 4401 for (int index = 0; index < methods->GetLength(); index ++) { 4402 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4403 methods->Get(index)->SetDeclaringClass(new_class); 4404 } 4405 } 4406 } 4407 4408 methods = new_class->GetVirtualMethods(); 4409 if (methods != nullptr) { 4410 for (int index = 0; index < methods->GetLength(); index ++) { 4411 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4412 methods->Get(index)->SetDeclaringClass(new_class); 4413 } 4414 } 4415 } 4416} 4417 4418bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4419 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4420 mirror::Class** new_class) { 4421 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4422 4423 if (!LinkSuperClass(klass)) { 4424 return false; 4425 } 4426 if (!LinkMethods(self, klass, interfaces)) { 4427 return false; 4428 } 4429 if (!LinkInstanceFields(self, klass)) { 4430 return false; 4431 } 4432 size_t class_size; 4433 if (!LinkStaticFields(self, klass, &class_size)) { 4434 return false; 4435 } 4436 CreateReferenceInstanceOffsets(klass); 4437 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4438 4439 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4440 // We don't need to retire this class as it has no embedded tables or it was created the 4441 // correct size during class linker initialization. 4442 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4443 4444 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4445 klass->PopulateEmbeddedImtAndVTable(); 4446 } 4447 4448 // This will notify waiters on klass that saw the not yet resolved 4449 // class in the class_table_ during EnsureResolved. 4450 klass->SetStatus(mirror::Class::kStatusResolved, self); 4451 *new_class = klass.Get(); 4452 } else { 4453 CHECK(!klass->IsResolved()); 4454 // Retire the temporary class and create the correctly sized resolved class. 4455 *new_class = klass->CopyOf(self, class_size); 4456 if (UNLIKELY(*new_class == nullptr)) { 4457 CHECK(self->IsExceptionPending()); // Expect an OOME. 4458 klass->SetStatus(mirror::Class::kStatusError, self); 4459 return false; 4460 } 4461 4462 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4463 StackHandleScope<1> hs(self); 4464 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4465 ObjectLock<mirror::Class> lock(self, new_class_h); 4466 4467 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4468 4469 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4470 CHECK(existing == nullptr || existing == klass.Get()); 4471 4472 // This will notify waiters on temp class that saw the not yet resolved class in the 4473 // class_table_ during EnsureResolved. 4474 klass->SetStatus(mirror::Class::kStatusRetired, self); 4475 4476 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4477 // This will notify waiters on new_class that saw the not yet resolved 4478 // class in the class_table_ during EnsureResolved. 4479 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4480 } 4481 return true; 4482} 4483 4484bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4485 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4486 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4487 uint16_t super_class_idx = class_def.superclass_idx_; 4488 if (super_class_idx != DexFile::kDexNoIndex16) { 4489 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4490 if (super_class == nullptr) { 4491 DCHECK(Thread::Current()->IsExceptionPending()); 4492 return false; 4493 } 4494 // Verify 4495 if (!klass->CanAccess(super_class)) { 4496 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4497 PrettyDescriptor(super_class).c_str(), 4498 PrettyDescriptor(klass.Get()).c_str()); 4499 return false; 4500 } 4501 CHECK(super_class->IsResolved()); 4502 klass->SetSuperClass(super_class); 4503 } 4504 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4505 if (interfaces != nullptr) { 4506 for (size_t i = 0; i < interfaces->Size(); i++) { 4507 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4508 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4509 if (interface == nullptr) { 4510 DCHECK(Thread::Current()->IsExceptionPending()); 4511 return false; 4512 } 4513 // Verify 4514 if (!klass->CanAccess(interface)) { 4515 // TODO: the RI seemed to ignore this in my testing. 4516 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4517 PrettyDescriptor(interface).c_str(), 4518 PrettyDescriptor(klass.Get()).c_str()); 4519 return false; 4520 } 4521 } 4522 } 4523 // Mark the class as loaded. 4524 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4525 return true; 4526} 4527 4528bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4529 CHECK(!klass->IsPrimitive()); 4530 mirror::Class* super = klass->GetSuperClass(); 4531 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4532 if (super != nullptr) { 4533 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4534 return false; 4535 } 4536 return true; 4537 } 4538 if (super == nullptr) { 4539 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4540 PrettyDescriptor(klass.Get()).c_str()); 4541 return false; 4542 } 4543 // Verify 4544 if (super->IsFinal() || super->IsInterface()) { 4545 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4546 PrettyDescriptor(super).c_str(), 4547 PrettyDescriptor(klass.Get()).c_str(), 4548 super->IsFinal() ? "declared final" : "an interface"); 4549 return false; 4550 } 4551 if (!klass->CanAccess(super)) { 4552 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4553 PrettyDescriptor(super).c_str(), 4554 PrettyDescriptor(klass.Get()).c_str()); 4555 return false; 4556 } 4557 4558 // Inherit kAccClassIsFinalizable from the superclass in case this 4559 // class doesn't override finalize. 4560 if (super->IsFinalizable()) { 4561 klass->SetFinalizable(); 4562 } 4563 4564 // Inherit reference flags (if any) from the superclass. 4565 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4566 if (reference_flags != 0) { 4567 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4568 } 4569 // Disallow custom direct subclasses of java.lang.ref.Reference. 4570 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4571 ThrowLinkageError(klass.Get(), 4572 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4573 PrettyDescriptor(klass.Get()).c_str()); 4574 return false; 4575 } 4576 4577 if (kIsDebugBuild) { 4578 // Ensure super classes are fully resolved prior to resolving fields.. 4579 while (super != nullptr) { 4580 CHECK(super->IsResolved()); 4581 super = super->GetSuperClass(); 4582 } 4583 } 4584 return true; 4585} 4586 4587// Populate the class vtable and itable. Compute return type indices. 4588bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4589 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4590 self->AllowThreadSuspension(); 4591 if (klass->IsInterface()) { 4592 // No vtable. 4593 size_t count = klass->NumVirtualMethods(); 4594 if (!IsUint(16, count)) { 4595 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4596 return false; 4597 } 4598 for (size_t i = 0; i < count; ++i) { 4599 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4600 } 4601 // Link interface method tables 4602 return LinkInterfaceMethods(klass, interfaces); 4603 } else { 4604 // Link virtual and interface method tables 4605 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4606 } 4607 return true; 4608} 4609 4610bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4611 if (klass->HasSuperClass()) { 4612 uint32_t max_count = klass->NumVirtualMethods() + 4613 klass->GetSuperClass()->GetVTableLength(); 4614 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4615 CHECK_LE(actual_count, max_count); 4616 StackHandleScope<4> hs(self); 4617 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4618 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4619 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4620 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4621 if (UNLIKELY(vtable.Get() == nullptr)) { 4622 CHECK(self->IsExceptionPending()); // OOME. 4623 return false; 4624 } 4625 int len = super_class->GetVTableLength(); 4626 for (int i = 0; i < len; i++) { 4627 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4628 } 4629 } else { 4630 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4631 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4632 if (UNLIKELY(vtable.Get() == nullptr)) { 4633 CHECK(self->IsExceptionPending()); // OOME. 4634 return false; 4635 } 4636 } 4637 4638 // See if any of our virtual methods override the superclass. 4639 MutableMethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4640 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4641 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4642 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4643 local_mh.ChangeMethod(local_method); 4644 size_t j = 0; 4645 for (; j < actual_count; ++j) { 4646 mirror::ArtMethod* super_method = vtable->Get(j); 4647 super_mh.ChangeMethod(super_method); 4648 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4649 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4650 super_method->GetAccessFlags())) { 4651 if (super_method->IsFinal()) { 4652 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4653 PrettyMethod(local_method).c_str(), 4654 super_method->GetDeclaringClassDescriptor()); 4655 return false; 4656 } 4657 vtable->Set<false>(j, local_method); 4658 local_method->SetMethodIndex(j); 4659 break; 4660 } else { 4661 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4662 << " would have incorrectly overridden the package-private method in " 4663 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4664 } 4665 } 4666 } 4667 if (j == actual_count) { 4668 // Not overriding, append. 4669 vtable->Set<false>(actual_count, local_method); 4670 local_method->SetMethodIndex(actual_count); 4671 actual_count += 1; 4672 } 4673 } 4674 if (!IsUint(16, actual_count)) { 4675 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4676 return false; 4677 } 4678 // Shrink vtable if possible 4679 CHECK_LE(actual_count, max_count); 4680 if (actual_count < max_count) { 4681 vtable.Assign(vtable->CopyOf(self, actual_count)); 4682 if (UNLIKELY(vtable.Get() == nullptr)) { 4683 CHECK(self->IsExceptionPending()); // OOME. 4684 return false; 4685 } 4686 } 4687 klass->SetVTable(vtable.Get()); 4688 } else { 4689 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4690 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4691 if (!IsUint(16, num_virtual_methods)) { 4692 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4693 return false; 4694 } 4695 StackHandleScope<1> hs(self); 4696 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4697 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4698 if (UNLIKELY(vtable.Get() == nullptr)) { 4699 CHECK(self->IsExceptionPending()); // OOME. 4700 return false; 4701 } 4702 for (size_t i = 0; i < num_virtual_methods; ++i) { 4703 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4704 vtable->Set<false>(i, virtual_method); 4705 virtual_method->SetMethodIndex(i & 0xFFFF); 4706 } 4707 klass->SetVTable(vtable.Get()); 4708 } 4709 return true; 4710} 4711 4712bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4713 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4714 Thread* const self = Thread::Current(); 4715 Runtime* const runtime = Runtime::Current(); 4716 // Set the imt table to be all conflicts by default. 4717 klass->SetImTable(runtime->GetDefaultImt()); 4718 size_t super_ifcount; 4719 if (klass->HasSuperClass()) { 4720 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4721 } else { 4722 super_ifcount = 0; 4723 } 4724 uint32_t num_interfaces = 4725 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4726 size_t ifcount = super_ifcount + num_interfaces; 4727 for (size_t i = 0; i < num_interfaces; i++) { 4728 mirror::Class* interface = 4729 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4730 interfaces->Get(i); 4731 ifcount += interface->GetIfTableCount(); 4732 } 4733 if (ifcount == 0) { 4734 // Class implements no interfaces. 4735 DCHECK_EQ(klass->GetIfTableCount(), 0); 4736 DCHECK(klass->GetIfTable() == nullptr); 4737 return true; 4738 } 4739 if (ifcount == super_ifcount) { 4740 // Class implements same interfaces as parent, are any of these not marker interfaces? 4741 bool has_non_marker_interface = false; 4742 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4743 for (size_t i = 0; i < ifcount; ++i) { 4744 if (super_iftable->GetMethodArrayCount(i) > 0) { 4745 has_non_marker_interface = true; 4746 break; 4747 } 4748 } 4749 if (!has_non_marker_interface) { 4750 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4751 klass->SetIfTable(super_iftable); 4752 return true; 4753 } 4754 } 4755 StackHandleScope<5> hs(self); 4756 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4757 if (UNLIKELY(iftable.Get() == nullptr)) { 4758 CHECK(self->IsExceptionPending()); // OOME. 4759 return false; 4760 } 4761 if (super_ifcount != 0) { 4762 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4763 for (size_t i = 0; i < super_ifcount; i++) { 4764 mirror::Class* super_interface = super_iftable->GetInterface(i); 4765 iftable->SetInterface(i, super_interface); 4766 } 4767 } 4768 self->AllowThreadSuspension(); 4769 // Flatten the interface inheritance hierarchy. 4770 size_t idx = super_ifcount; 4771 for (size_t i = 0; i < num_interfaces; i++) { 4772 mirror::Class* interface = 4773 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4774 interfaces->Get(i); 4775 DCHECK(interface != nullptr); 4776 if (!interface->IsInterface()) { 4777 std::string temp; 4778 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4779 PrettyDescriptor(klass.Get()).c_str(), 4780 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4781 return false; 4782 } 4783 // Check if interface is already in iftable 4784 bool duplicate = false; 4785 for (size_t j = 0; j < idx; j++) { 4786 mirror::Class* existing_interface = iftable->GetInterface(j); 4787 if (existing_interface == interface) { 4788 duplicate = true; 4789 break; 4790 } 4791 } 4792 if (!duplicate) { 4793 // Add this non-duplicate interface. 4794 iftable->SetInterface(idx++, interface); 4795 // Add this interface's non-duplicate super-interfaces. 4796 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4797 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4798 bool super_duplicate = false; 4799 for (size_t k = 0; k < idx; k++) { 4800 mirror::Class* existing_interface = iftable->GetInterface(k); 4801 if (existing_interface == super_interface) { 4802 super_duplicate = true; 4803 break; 4804 } 4805 } 4806 if (!super_duplicate) { 4807 iftable->SetInterface(idx++, super_interface); 4808 } 4809 } 4810 } 4811 } 4812 self->AllowThreadSuspension(); 4813 // Shrink iftable in case duplicates were found 4814 if (idx < ifcount) { 4815 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4816 if (UNLIKELY(iftable.Get() == nullptr)) { 4817 CHECK(self->IsExceptionPending()); // OOME. 4818 return false; 4819 } 4820 ifcount = idx; 4821 } else { 4822 CHECK_EQ(idx, ifcount); 4823 } 4824 klass->SetIfTable(iftable.Get()); 4825 4826 // If we're an interface, we don't need the vtable pointers, so we're done. 4827 if (klass->IsInterface()) { 4828 return true; 4829 } 4830 self->AllowThreadSuspension(); 4831 // Allocate imtable 4832 bool imtable_changed = false; 4833 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4834 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4835 if (UNLIKELY(imtable.Get() == nullptr)) { 4836 CHECK(self->IsExceptionPending()); // OOME. 4837 return false; 4838 } 4839 MutableMethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4840 MutableMethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4841 size_t max_miranda_methods = 0; // The max size of miranda_list. 4842 for (size_t i = 0; i < ifcount; ++i) { 4843 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4844 } 4845 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4846 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4847 size_t miranda_list_size = 0; // The current size of miranda_list. 4848 for (size_t i = 0; i < ifcount; ++i) { 4849 self->AllowThreadSuspension(); 4850 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4851 if (num_methods > 0) { 4852 StackHandleScope<2> hs(self); 4853 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4854 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4855 if (UNLIKELY(method_array.Get() == nullptr)) { 4856 CHECK(self->IsExceptionPending()); // OOME. 4857 return false; 4858 } 4859 iftable->SetMethodArray(i, method_array.Get()); 4860 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4861 hs.NewHandle(klass->GetVTableDuringLinking())); 4862 for (size_t j = 0; j < num_methods; ++j) { 4863 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4864 int32_t k; 4865 // For each method listed in the interface's method list, find the 4866 // matching method in our class's method list. We want to favor the 4867 // subclass over the superclass, which just requires walking 4868 // back from the end of the vtable. (This only matters if the 4869 // superclass defines a private method and this class redefines 4870 // it -- otherwise it would use the same vtable slot. In .dex files 4871 // those don't end up in the virtual method table, so it shouldn't 4872 // matter which direction we go. We walk it backward anyway.) 4873 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4874 vtable_mh.ChangeMethod(vtable->Get(k)); 4875 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4876 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4877 ThrowIllegalAccessError( 4878 klass.Get(), 4879 "Method '%s' implementing interface method '%s' is not public", 4880 PrettyMethod(vtable_mh.Get()).c_str(), 4881 PrettyMethod(interface_mh.Get()).c_str()); 4882 return false; 4883 } 4884 method_array->Set<false>(j, vtable_mh.Get()); 4885 // Place method in imt if entry is empty, place conflict otherwise. 4886 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4887 if (imtable->Get(imt_index) == nullptr) { 4888 imtable->Set<false>(imt_index, vtable_mh.Get()); 4889 imtable_changed = true; 4890 } else { 4891 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4892 } 4893 break; 4894 } 4895 } 4896 if (k < 0) { 4897 StackHandleScope<1> hs(self); 4898 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4899 for (size_t l = 0; l < miranda_list_size; ++l) { 4900 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4901 DCHECK(mir_method != nullptr); 4902 vtable_mh.ChangeMethod(mir_method); 4903 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4904 miranda_method.Assign(mir_method); 4905 break; 4906 } 4907 } 4908 if (miranda_method.Get() == nullptr) { 4909 // Point the interface table at a phantom slot. 4910 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4911 if (UNLIKELY(miranda_method.Get() == nullptr)) { 4912 CHECK(self->IsExceptionPending()); // OOME. 4913 return false; 4914 } 4915 DCHECK_LT(miranda_list_size, max_miranda_methods); 4916 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4917 } 4918 method_array->Set<false>(j, miranda_method.Get()); 4919 } 4920 } 4921 } 4922 } 4923 if (imtable_changed) { 4924 // Fill in empty entries in interface method table with conflict. 4925 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4926 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4927 if (imtable->Get(i) == nullptr) { 4928 imtable->Set<false>(i, imt_conflict_method); 4929 } 4930 } 4931 klass->SetImTable(imtable.Get()); 4932 } 4933 if (miranda_list_size > 0) { 4934 int old_method_count = klass->NumVirtualMethods(); 4935 int new_method_count = old_method_count + miranda_list_size; 4936 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4937 if (old_method_count == 0) { 4938 virtuals = AllocArtMethodArray(self, new_method_count); 4939 } else { 4940 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4941 } 4942 if (UNLIKELY(virtuals == nullptr)) { 4943 CHECK(self->IsExceptionPending()); // OOME. 4944 return false; 4945 } 4946 klass->SetVirtualMethods(virtuals); 4947 4948 StackHandleScope<1> hs(self); 4949 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4950 hs.NewHandle(klass->GetVTableDuringLinking())); 4951 CHECK(vtable.Get() != nullptr); 4952 int old_vtable_count = vtable->GetLength(); 4953 int new_vtable_count = old_vtable_count + miranda_list_size; 4954 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4955 if (UNLIKELY(vtable.Get() == nullptr)) { 4956 CHECK(self->IsExceptionPending()); // OOME. 4957 return false; 4958 } 4959 for (size_t i = 0; i < miranda_list_size; ++i) { 4960 mirror::ArtMethod* method = miranda_list->Get(i); 4961 // Leave the declaring class alone as type indices are relative to it 4962 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4963 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4964 klass->SetVirtualMethod(old_method_count + i, method); 4965 vtable->Set<false>(old_vtable_count + i, method); 4966 } 4967 // TODO: do not assign to the vtable field until it is fully constructed. 4968 klass->SetVTable(vtable.Get()); 4969 } 4970 4971 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4972 for (int i = 0; i < vtable->GetLength(); ++i) { 4973 CHECK(vtable->Get(i) != nullptr); 4974 } 4975 4976 self->AllowThreadSuspension(); 4977 4978 return true; 4979} 4980 4981bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 4982 CHECK(klass.Get() != nullptr); 4983 return LinkFields(self, klass, false, nullptr); 4984} 4985 4986bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 4987 CHECK(klass.Get() != nullptr); 4988 return LinkFields(self, klass, true, class_size); 4989} 4990 4991struct LinkFieldsComparator { 4992 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4993 } 4994 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4995 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4996 NO_THREAD_SAFETY_ANALYSIS { 4997 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4998 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4999 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5000 if (type1 != type2) { 5001 bool is_primitive1 = type1 != Primitive::kPrimNot; 5002 bool is_primitive2 = type2 != Primitive::kPrimNot; 5003 if (type1 != type2) { 5004 if (is_primitive1 && is_primitive2) { 5005 // Larger primitive types go first. 5006 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5007 } else { 5008 // Reference always goes first. 5009 return !is_primitive1; 5010 } 5011 } 5012 } 5013 // same basic group? then sort by string. 5014 return strcmp(field1->GetName(), field2->GetName()) < 0; 5015 } 5016}; 5017 5018bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5019 size_t* class_size) { 5020 self->AllowThreadSuspension(); 5021 size_t num_fields = 5022 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5023 5024 mirror::ObjectArray<mirror::ArtField>* fields = 5025 is_static ? klass->GetSFields() : klass->GetIFields(); 5026 5027 // Initialize field_offset 5028 MemberOffset field_offset(0); 5029 if (is_static) { 5030 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5031 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5032 // Static fields come after the embedded tables. 5033 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5034 0, 0, 0, 0, 0); 5035 } 5036 field_offset = MemberOffset(base); 5037 } else { 5038 mirror::Class* super_class = klass->GetSuperClass(); 5039 if (super_class != nullptr) { 5040 CHECK(super_class->IsResolved()) 5041 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5042 field_offset = MemberOffset(super_class->GetObjectSize()); 5043 } 5044 } 5045 5046 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5047 5048 // we want a relatively stable order so that adding new fields 5049 // minimizes disruption of C++ version such as Class and Method. 5050 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5051 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5052 "Naked ArtField references in deque"); 5053 for (size_t i = 0; i < num_fields; i++) { 5054 mirror::ArtField* f = fields->Get(i); 5055 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5056 grouped_and_sorted_fields.push_back(f); 5057 } 5058 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5059 LinkFieldsComparator()); 5060 5061 // References should be at the front. 5062 size_t current_field = 0; 5063 size_t num_reference_fields = 0; 5064 FieldGaps gaps; 5065 5066 for (; current_field < num_fields; current_field++) { 5067 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5068 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5069 bool isPrimitive = type != Primitive::kPrimNot; 5070 if (isPrimitive) { 5071 break; // past last reference, move on to the next phase 5072 } 5073 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5074 MemberOffset old_offset = field_offset; 5075 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5076 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5077 } 5078 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5079 grouped_and_sorted_fields.pop_front(); 5080 num_reference_fields++; 5081 fields->Set<false>(current_field, field); 5082 field->SetOffset(field_offset); 5083 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5084 } 5085 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5086 // otherwise we could end up with suboptimal gap fills. 5087 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5088 fields, &grouped_and_sorted_fields, &gaps); 5089 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5090 fields, &grouped_and_sorted_fields, &gaps); 5091 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5092 fields, &grouped_and_sorted_fields, &gaps); 5093 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5094 fields, &grouped_and_sorted_fields, &gaps); 5095 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5096 " fields."; 5097 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5098 5099 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5100 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5101 // We know there are no non-reference fields in the Reference classes, and we know 5102 // that 'referent' is alphabetically last, so this is easy... 5103 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5104 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5105 --num_reference_fields; 5106 } 5107 5108 if (kIsDebugBuild) { 5109 // Make sure that all reference fields appear before 5110 // non-reference fields, and all double-wide fields are aligned. 5111 bool seen_non_ref = false; 5112 for (size_t i = 0; i < num_fields; i++) { 5113 mirror::ArtField* field = fields->Get(i); 5114 if ((false)) { // enable to debug field layout 5115 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5116 << " class=" << PrettyClass(klass.Get()) 5117 << " field=" << PrettyField(field) 5118 << " offset=" 5119 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5120 } 5121 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5122 bool is_primitive = type != Primitive::kPrimNot; 5123 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5124 strcmp("referent", field->GetName()) == 0) { 5125 is_primitive = true; // We lied above, so we have to expect a lie here. 5126 } 5127 if (is_primitive) { 5128 if (!seen_non_ref) { 5129 seen_non_ref = true; 5130 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5131 } 5132 } else { 5133 DCHECK(!seen_non_ref) << PrettyField(field); 5134 } 5135 } 5136 if (!seen_non_ref) { 5137 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5138 } 5139 } 5140 5141 size_t size = field_offset.Uint32Value(); 5142 // Update klass 5143 if (is_static) { 5144 klass->SetNumReferenceStaticFields(num_reference_fields); 5145 *class_size = size; 5146 } else { 5147 klass->SetNumReferenceInstanceFields(num_reference_fields); 5148 if (!klass->IsVariableSize()) { 5149 std::string temp; 5150 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5151 size_t previous_size = klass->GetObjectSize(); 5152 if (previous_size != 0) { 5153 // Make sure that we didn't originally have an incorrect size. 5154 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5155 } 5156 klass->SetObjectSize(size); 5157 } 5158 } 5159 return true; 5160} 5161 5162// Set the bitmap of reference offsets, refOffsets, from the ifields 5163// list. 5164void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5165 uint32_t reference_offsets = 0; 5166 mirror::Class* super_class = klass->GetSuperClass(); 5167 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5168 if (super_class != nullptr) { 5169 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5170 // Compute reference offsets unless our superclass overflowed. 5171 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5172 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5173 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5174 // All of the fields that contain object references are guaranteed 5175 // to be at the beginning of the fields list. 5176 for (size_t i = 0; i < num_reference_fields; ++i) { 5177 // Note that byte_offset is the offset from the beginning of 5178 // object, not the offset into instance data 5179 mirror::ArtField* field = fields->Get(i); 5180 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5181 uint32_t displaced_bitmap_position = 5182 (byte_offset.Uint32Value() - mirror::kObjectHeaderSize) / 5183 sizeof(mirror::HeapReference<mirror::Object>); 5184 if (displaced_bitmap_position >= 32) { 5185 // Can't encode offset so fall back on slow-path. 5186 reference_offsets = mirror::Class::kClassWalkSuper; 5187 break; 5188 } else { 5189 reference_offsets |= (1 << displaced_bitmap_position); 5190 } 5191 } 5192 } 5193 } 5194 klass->SetReferenceInstanceOffsets(reference_offsets); 5195} 5196 5197mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5198 Handle<mirror::DexCache> dex_cache) { 5199 DCHECK(dex_cache.Get() != nullptr); 5200 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5201 if (resolved != nullptr) { 5202 return resolved; 5203 } 5204 uint32_t utf16_length; 5205 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5206 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5207 dex_cache->SetResolvedString(string_idx, string); 5208 return string; 5209} 5210 5211mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5212 mirror::Class* referrer) { 5213 StackHandleScope<2> hs(Thread::Current()); 5214 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5215 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5216 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5217} 5218 5219mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5220 Handle<mirror::DexCache> dex_cache, 5221 Handle<mirror::ClassLoader> class_loader) { 5222 DCHECK(dex_cache.Get() != nullptr); 5223 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5224 if (resolved == nullptr) { 5225 Thread* self = Thread::Current(); 5226 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5227 resolved = FindClass(self, descriptor, class_loader); 5228 if (resolved != nullptr) { 5229 // TODO: we used to throw here if resolved's class loader was not the 5230 // boot class loader. This was to permit different classes with the 5231 // same name to be loaded simultaneously by different loaders 5232 dex_cache->SetResolvedType(type_idx, resolved); 5233 } else { 5234 CHECK(self->IsExceptionPending()) 5235 << "Expected pending exception for failed resolution of: " << descriptor; 5236 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5237 StackHandleScope<1> hs(self); 5238 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5239 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5240 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5241 self->ClearException(); 5242 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5243 self->GetException(nullptr)->SetCause(cause.Get()); 5244 } 5245 } 5246 } 5247 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5248 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5249 return resolved; 5250} 5251 5252mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5253 Handle<mirror::DexCache> dex_cache, 5254 Handle<mirror::ClassLoader> class_loader, 5255 Handle<mirror::ArtMethod> referrer, 5256 InvokeType type) { 5257 DCHECK(dex_cache.Get() != nullptr); 5258 // Check for hit in the dex cache. 5259 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5260 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5261 return resolved; 5262 } 5263 // Fail, get the declaring class. 5264 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5265 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5266 if (klass == nullptr) { 5267 DCHECK(Thread::Current()->IsExceptionPending()); 5268 return nullptr; 5269 } 5270 // Scan using method_idx, this saves string compares but will only hit for matching dex 5271 // caches/files. 5272 switch (type) { 5273 case kDirect: // Fall-through. 5274 case kStatic: 5275 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5276 break; 5277 case kInterface: 5278 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5279 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5280 break; 5281 case kSuper: // Fall-through. 5282 case kVirtual: 5283 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5284 break; 5285 default: 5286 LOG(FATAL) << "Unreachable - invocation type: " << type; 5287 UNREACHABLE(); 5288 } 5289 if (resolved == nullptr) { 5290 // Search by name, which works across dex files. 5291 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5292 const Signature signature = dex_file.GetMethodSignature(method_id); 5293 switch (type) { 5294 case kDirect: // Fall-through. 5295 case kStatic: 5296 resolved = klass->FindDirectMethod(name, signature); 5297 break; 5298 case kInterface: 5299 resolved = klass->FindInterfaceMethod(name, signature); 5300 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5301 break; 5302 case kSuper: // Fall-through. 5303 case kVirtual: 5304 resolved = klass->FindVirtualMethod(name, signature); 5305 break; 5306 } 5307 } 5308 // If we found a method, check for incompatible class changes. 5309 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5310 // Be a good citizen and update the dex cache to speed subsequent calls. 5311 dex_cache->SetResolvedMethod(method_idx, resolved); 5312 return resolved; 5313 } else { 5314 // If we had a method, it's an incompatible-class-change error. 5315 if (resolved != nullptr) { 5316 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5317 } else { 5318 // We failed to find the method which means either an access error, an incompatible class 5319 // change, or no such method. First try to find the method among direct and virtual methods. 5320 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5321 const Signature signature = dex_file.GetMethodSignature(method_id); 5322 switch (type) { 5323 case kDirect: 5324 case kStatic: 5325 resolved = klass->FindVirtualMethod(name, signature); 5326 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5327 // have had a resolved method before, which triggers the "true" branch above. 5328 break; 5329 case kInterface: 5330 case kVirtual: 5331 case kSuper: 5332 resolved = klass->FindDirectMethod(name, signature); 5333 break; 5334 } 5335 5336 // If we found something, check that it can be accessed by the referrer. 5337 if (resolved != nullptr && referrer.Get() != nullptr) { 5338 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5339 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5340 if (!referring_class->CanAccess(methods_class)) { 5341 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5342 resolved, type); 5343 return nullptr; 5344 } else if (!referring_class->CanAccessMember(methods_class, 5345 resolved->GetAccessFlags())) { 5346 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5347 return nullptr; 5348 } 5349 } 5350 5351 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5352 // methods and throw if we find the method there. If we find nothing, throw a 5353 // NoSuchMethodError. 5354 switch (type) { 5355 case kDirect: 5356 case kStatic: 5357 if (resolved != nullptr) { 5358 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5359 } else { 5360 resolved = klass->FindInterfaceMethod(name, signature); 5361 if (resolved != nullptr) { 5362 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5363 } else { 5364 ThrowNoSuchMethodError(type, klass, name, signature); 5365 } 5366 } 5367 break; 5368 case kInterface: 5369 if (resolved != nullptr) { 5370 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5371 } else { 5372 resolved = klass->FindVirtualMethod(name, signature); 5373 if (resolved != nullptr) { 5374 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5375 } else { 5376 ThrowNoSuchMethodError(type, klass, name, signature); 5377 } 5378 } 5379 break; 5380 case kSuper: 5381 if (resolved != nullptr) { 5382 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5383 } else { 5384 ThrowNoSuchMethodError(type, klass, name, signature); 5385 } 5386 break; 5387 case kVirtual: 5388 if (resolved != nullptr) { 5389 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5390 } else { 5391 resolved = klass->FindInterfaceMethod(name, signature); 5392 if (resolved != nullptr) { 5393 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5394 } else { 5395 ThrowNoSuchMethodError(type, klass, name, signature); 5396 } 5397 } 5398 break; 5399 } 5400 } 5401 DCHECK(Thread::Current()->IsExceptionPending()); 5402 return nullptr; 5403 } 5404} 5405 5406mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5407 Handle<mirror::DexCache> dex_cache, 5408 Handle<mirror::ClassLoader> class_loader, 5409 bool is_static) { 5410 DCHECK(dex_cache.Get() != nullptr); 5411 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5412 if (resolved != nullptr) { 5413 return resolved; 5414 } 5415 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5416 Thread* const self = Thread::Current(); 5417 StackHandleScope<1> hs(self); 5418 Handle<mirror::Class> klass( 5419 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5420 if (klass.Get() == nullptr) { 5421 DCHECK(Thread::Current()->IsExceptionPending()); 5422 return nullptr; 5423 } 5424 5425 if (is_static) { 5426 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5427 } else { 5428 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5429 } 5430 5431 if (resolved == nullptr) { 5432 const char* name = dex_file.GetFieldName(field_id); 5433 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5434 if (is_static) { 5435 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5436 } else { 5437 resolved = klass->FindInstanceField(name, type); 5438 } 5439 if (resolved == nullptr) { 5440 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5441 return nullptr; 5442 } 5443 } 5444 dex_cache->SetResolvedField(field_idx, resolved); 5445 return resolved; 5446} 5447 5448mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5449 uint32_t field_idx, 5450 Handle<mirror::DexCache> dex_cache, 5451 Handle<mirror::ClassLoader> class_loader) { 5452 DCHECK(dex_cache.Get() != nullptr); 5453 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5454 if (resolved != nullptr) { 5455 return resolved; 5456 } 5457 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5458 Thread* self = Thread::Current(); 5459 StackHandleScope<1> hs(self); 5460 Handle<mirror::Class> klass( 5461 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5462 if (klass.Get() == nullptr) { 5463 DCHECK(Thread::Current()->IsExceptionPending()); 5464 return nullptr; 5465 } 5466 5467 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5468 StringPiece type(dex_file.StringDataByIdx( 5469 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5470 resolved = mirror::Class::FindField(self, klass, name, type); 5471 if (resolved != nullptr) { 5472 dex_cache->SetResolvedField(field_idx, resolved); 5473 } else { 5474 ThrowNoSuchFieldError("", klass.Get(), type, name); 5475 } 5476 return resolved; 5477} 5478 5479const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5480 uint32_t* length) { 5481 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5482 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5483 const DexFile& dex_file = *dex_cache->GetDexFile(); 5484 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5485 return dex_file.GetMethodShorty(method_id, length); 5486} 5487 5488void ClassLinker::DumpAllClasses(int flags) { 5489 if (dex_cache_image_class_lookup_required_) { 5490 MoveImageClassesToClassTable(); 5491 } 5492 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5493 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5494 std::vector<mirror::Class*> all_classes; 5495 { 5496 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5497 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5498 mirror::Class* klass = it.second.Read(); 5499 all_classes.push_back(klass); 5500 } 5501 } 5502 5503 for (size_t i = 0; i < all_classes.size(); ++i) { 5504 all_classes[i]->DumpClass(std::cerr, flags); 5505 } 5506} 5507 5508static OatFile::OatMethod CreateOatMethod(const void* code, const uint8_t* gc_map, 5509 bool is_portable) { 5510 CHECK_EQ(kUsePortableCompiler, is_portable); 5511 CHECK(code != nullptr); 5512 const uint8_t* base; 5513 uint32_t code_offset, gc_map_offset; 5514 if (gc_map == nullptr) { 5515 base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5516 base -= sizeof(void*); // Move backward so that code_offset != 0. 5517 code_offset = sizeof(void*); 5518 gc_map_offset = 0; 5519 } else { 5520 // TODO: 64bit support. 5521 base = nullptr; // Base of data in oat file, ie 0. 5522 code_offset = PointerToLowMemUInt32(code); 5523 gc_map_offset = PointerToLowMemUInt32(gc_map); 5524 } 5525 return OatFile::OatMethod(base, code_offset, gc_map_offset); 5526} 5527 5528bool ClassLinker::IsPortableResolutionStub(const void* entry_point) const { 5529 return (entry_point == GetPortableResolutionStub()) || 5530 (portable_resolution_trampoline_ == entry_point); 5531} 5532 5533bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5534 return (entry_point == GetQuickResolutionStub()) || 5535 (quick_resolution_trampoline_ == entry_point); 5536} 5537 5538bool ClassLinker::IsPortableToInterpreterBridge(const void* entry_point) const { 5539 return (entry_point == GetPortableToInterpreterBridge()); 5540 // TODO: portable_to_interpreter_bridge_trampoline_ == entry_point; 5541} 5542 5543bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5544 return (entry_point == GetQuickToInterpreterBridge()) || 5545 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5546} 5547 5548bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5549 return (entry_point == GetQuickGenericJniStub()) || 5550 (quick_generic_jni_trampoline_ == entry_point); 5551} 5552 5553const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5554 return GetQuickGenericJniStub(); 5555} 5556 5557void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code, 5558 bool is_portable) const { 5559 OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr, is_portable); 5560 oat_method.LinkMethod(method); 5561 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5562 // Create bridges to transition between different kinds of compiled bridge. 5563 if (method->GetEntryPointFromPortableCompiledCode() == nullptr) { 5564 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5565 } else { 5566 CHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 5567 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 5568 method->SetIsPortableCompiled(); 5569 } 5570} 5571 5572void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5573 if (!method->IsNative()) { 5574 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5575 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 5576 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5577 } else { 5578 const void* quick_method_code = GetQuickGenericJniStub(); 5579 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code, nullptr, false); 5580 oat_method.LinkMethod(method); 5581 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5582 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5583 } 5584} 5585 5586void ClassLinker::DumpForSigQuit(std::ostream& os) { 5587 Thread* self = Thread::Current(); 5588 if (dex_cache_image_class_lookup_required_) { 5589 ScopedObjectAccess soa(self); 5590 MoveImageClassesToClassTable(); 5591 } 5592 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5593 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5594} 5595 5596size_t ClassLinker::NumLoadedClasses() { 5597 if (dex_cache_image_class_lookup_required_) { 5598 MoveImageClassesToClassTable(); 5599 } 5600 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5601 return class_table_.size(); 5602} 5603 5604pid_t ClassLinker::GetClassesLockOwner() { 5605 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5606} 5607 5608pid_t ClassLinker::GetDexLockOwner() { 5609 return dex_lock_.GetExclusiveOwnerTid(); 5610} 5611 5612void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5613 DCHECK(!init_done_); 5614 5615 DCHECK(klass != nullptr); 5616 DCHECK(klass->GetClassLoader() == nullptr); 5617 5618 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5619 DCHECK(class_roots != nullptr); 5620 DCHECK(class_roots->Get(class_root) == nullptr); 5621 class_roots->Set<false>(class_root, klass); 5622} 5623 5624const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5625 static const char* class_roots_descriptors[] = { 5626 "Ljava/lang/Class;", 5627 "Ljava/lang/Object;", 5628 "[Ljava/lang/Class;", 5629 "[Ljava/lang/Object;", 5630 "Ljava/lang/String;", 5631 "Ljava/lang/DexCache;", 5632 "Ljava/lang/ref/Reference;", 5633 "Ljava/lang/reflect/ArtField;", 5634 "Ljava/lang/reflect/ArtMethod;", 5635 "Ljava/lang/reflect/Proxy;", 5636 "[Ljava/lang/String;", 5637 "[Ljava/lang/reflect/ArtField;", 5638 "[Ljava/lang/reflect/ArtMethod;", 5639 "Ljava/lang/ClassLoader;", 5640 "Ljava/lang/Throwable;", 5641 "Ljava/lang/ClassNotFoundException;", 5642 "Ljava/lang/StackTraceElement;", 5643 "Z", 5644 "B", 5645 "C", 5646 "D", 5647 "F", 5648 "I", 5649 "J", 5650 "S", 5651 "V", 5652 "[Z", 5653 "[B", 5654 "[C", 5655 "[D", 5656 "[F", 5657 "[I", 5658 "[J", 5659 "[S", 5660 "[Ljava/lang/StackTraceElement;", 5661 }; 5662 COMPILE_ASSERT(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5663 mismatch_between_class_descriptors_and_class_root_enum); 5664 5665 const char* descriptor = class_roots_descriptors[class_root]; 5666 CHECK(descriptor != nullptr); 5667 return descriptor; 5668} 5669 5670} // namespace art 5671