class_linker.cc revision 677cd61ad05d993c4d3b22656675874f06d6aabc
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <memory> 21#include <queue> 22#include <string> 23#include <utility> 24#include <vector> 25 26#include "base/casts.h" 27#include "base/logging.h" 28#include "base/scoped_flock.h" 29#include "base/stl_util.h" 30#include "base/unix_file/fd_file.h" 31#include "class_linker-inl.h" 32#include "compiler_callbacks.h" 33#include "debugger.h" 34#include "dex_file-inl.h" 35#include "entrypoints/runtime_asm_entrypoints.h" 36#include "gc_root-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "method_helper-inl.h" 46#include "oat.h" 47#include "oat_file.h" 48#include "object_lock.h" 49#include "mirror/art_field-inl.h" 50#include "mirror/art_method-inl.h" 51#include "mirror/class.h" 52#include "mirror/class-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/dex_cache-inl.h" 55#include "mirror/iftable-inl.h" 56#include "mirror/object-inl.h" 57#include "mirror/object_array-inl.h" 58#include "mirror/proxy.h" 59#include "mirror/reference-inl.h" 60#include "mirror/stack_trace_element.h" 61#include "mirror/string-inl.h" 62#include "os.h" 63#include "runtime.h" 64#include "entrypoints/entrypoint_utils.h" 65#include "ScopedLocalRef.h" 66#include "scoped_thread_state_change.h" 67#include "handle_scope-inl.h" 68#include "thread-inl.h" 69#include "utils.h" 70#include "verifier/method_verifier.h" 71#include "well_known_classes.h" 72 73namespace art { 74 75static void ThrowNoClassDefFoundError(const char* fmt, ...) 76 __attribute__((__format__(__printf__, 1, 2))) 77 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 78static void ThrowNoClassDefFoundError(const char* fmt, ...) { 79 va_list args; 80 va_start(args, fmt); 81 Thread* self = Thread::Current(); 82 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 83 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 84 va_end(args); 85} 86 87static void ThrowEarlierClassFailure(mirror::Class* c) 88 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 89 // The class failed to initialize on a previous attempt, so we want to throw 90 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 91 // failed in verification, in which case v2 5.4.1 says we need to re-throw 92 // the previous error. 93 Runtime* runtime = Runtime::Current(); 94 bool is_compiler = runtime->IsCompiler(); 95 if (!is_compiler) { // Give info if this occurs at runtime. 96 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 97 } 98 99 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 100 Thread* self = Thread::Current(); 101 if (is_compiler) { 102 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 103 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 104 self->SetException(ThrowLocation(), pre_allocated); 105 } else { 106 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 107 if (c->GetVerifyErrorClass() != NULL) { 108 // TODO: change the verifier to store an _instance_, with a useful detail message? 109 std::string temp; 110 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 111 PrettyDescriptor(c).c_str()); 112 } else { 113 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 114 PrettyDescriptor(c).c_str()); 115 } 116 } 117} 118 119static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 120 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 121 if (VLOG_IS_ON(class_linker)) { 122 std::string temp; 123 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 124 << klass->GetLocation() << "\n" << Thread::Current()->GetException(nullptr)->Dump(); 125 } 126} 127 128static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 129 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 130 Thread* self = Thread::Current(); 131 JNIEnv* env = self->GetJniEnv(); 132 133 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 134 CHECK(cause.get() != nullptr); 135 136 env->ExceptionClear(); 137 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 138 env->Throw(cause.get()); 139 140 // We only wrap non-Error exceptions; an Error can just be used as-is. 141 if (!is_error) { 142 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 143 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 144 nullptr); 145 } 146 VlogClassInitializationFailure(klass); 147} 148 149static size_t Hash(const char* s) { 150 // This is the java.lang.String hashcode for convenience, not interoperability. 151 size_t hash = 0; 152 for (; *s != '\0'; ++s) { 153 hash = hash * 31 + *s; 154 } 155 return hash; 156} 157 158// Gap between two fields in object layout. 159struct FieldGap { 160 uint32_t start_offset; // The offset from the start of the object. 161 uint32_t size; // The gap size of 1, 2, or 4 bytes. 162}; 163struct FieldGapsComparator { 164 explicit FieldGapsComparator() { 165 } 166 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 167 NO_THREAD_SAFETY_ANALYSIS { 168 // Sort by gap size, largest first. 169 return lhs.size > rhs.size; 170 } 171}; 172typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 173 174// Adds largest aligned gaps to queue of gaps. 175void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 176 DCHECK(gaps != nullptr); 177 178 uint32_t current_offset = gap_start; 179 while (current_offset != gap_end) { 180 size_t remaining = gap_end - current_offset; 181 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 182 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 183 current_offset += sizeof(uint32_t); 184 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 185 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 186 current_offset += sizeof(uint16_t); 187 } else { 188 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 189 current_offset += sizeof(uint8_t); 190 } 191 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 192 } 193} 194// Shuffle fields forward, making use of gaps whenever possible. 195template<int n> 196static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 197 MemberOffset* field_offset, 198 mirror::ObjectArray<mirror::ArtField>* fields, 199 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 200 FieldGaps* gaps) 201 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 202 DCHECK(current_field_idx != nullptr); 203 DCHECK(grouped_and_sorted_fields != nullptr); 204 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 205 DCHECK(gaps != nullptr); 206 DCHECK(field_offset != nullptr); 207 208 DCHECK(IsPowerOfTwo(n)); 209 while (!grouped_and_sorted_fields->empty()) { 210 mirror::ArtField* field = grouped_and_sorted_fields->front(); 211 Primitive::Type type = field->GetTypeAsPrimitiveType(); 212 if (Primitive::ComponentSize(type) < n) { 213 break; 214 } 215 if (!IsAligned<n>(field_offset->Uint32Value())) { 216 MemberOffset old_offset = *field_offset; 217 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 218 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 219 } 220 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 221 grouped_and_sorted_fields->pop_front(); 222 fields->Set<false>(*current_field_idx, field); 223 if (!gaps->empty() && gaps->top().size >= n) { 224 FieldGap gap = gaps->top(); 225 gaps->pop(); 226 DCHECK(IsAligned<n>(gap.start_offset)); 227 field->SetOffset(MemberOffset(gap.start_offset)); 228 if (gap.size > n) { 229 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 230 } 231 } else { 232 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 233 field->SetOffset(*field_offset); 234 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 235 } 236 ++(*current_field_idx); 237 } 238} 239 240ClassLinker::ClassLinker(InternTable* intern_table) 241 // dex_lock_ is recursive as it may be used in stack dumping. 242 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 243 dex_cache_image_class_lookup_required_(false), 244 failed_dex_cache_class_lookups_(0), 245 class_roots_(nullptr), 246 array_iftable_(nullptr), 247 find_array_class_cache_next_victim_(0), 248 init_done_(false), 249 log_new_dex_caches_roots_(false), 250 log_new_class_table_roots_(false), 251 intern_table_(intern_table), 252 portable_resolution_trampoline_(nullptr), 253 quick_resolution_trampoline_(nullptr), 254 portable_imt_conflict_trampoline_(nullptr), 255 quick_imt_conflict_trampoline_(nullptr), 256 quick_generic_jni_trampoline_(nullptr), 257 quick_to_interpreter_bridge_trampoline_(nullptr) { 258 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 259} 260 261void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 262 VLOG(startup) << "ClassLinker::Init"; 263 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 264 265 CHECK(!init_done_); 266 267 // java_lang_Class comes first, it's needed for AllocClass 268 Thread* self = Thread::Current(); 269 gc::Heap* heap = Runtime::Current()->GetHeap(); 270 // The GC can't handle an object with a null class since we can't get the size of this object. 271 heap->IncrementDisableMovingGC(self); 272 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 273 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 274 heap->AllocNonMovableObject<true>(self, nullptr, 275 mirror::Class::ClassClassSize(), 276 VoidFunctor())))); 277 CHECK(java_lang_Class.Get() != nullptr); 278 mirror::Class::SetClassClass(java_lang_Class.Get()); 279 java_lang_Class->SetClass(java_lang_Class.Get()); 280 if (kUseBakerOrBrooksReadBarrier) { 281 java_lang_Class->AssertReadBarrierPointer(); 282 } 283 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 284 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 285 heap->DecrementDisableMovingGC(self); 286 // AllocClass(mirror::Class*) can now be used 287 288 // Class[] is used for reflection support. 289 Handle<mirror::Class> class_array_class(hs.NewHandle( 290 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 291 class_array_class->SetComponentType(java_lang_Class.Get()); 292 293 // java_lang_Object comes next so that object_array_class can be created. 294 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 295 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 296 CHECK(java_lang_Object.Get() != nullptr); 297 // backfill Object as the super class of Class. 298 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 299 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 300 301 // Object[] next to hold class roots. 302 Handle<mirror::Class> object_array_class(hs.NewHandle( 303 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 304 object_array_class->SetComponentType(java_lang_Object.Get()); 305 306 // Setup the char (primitive) class to be used for char[]. 307 Handle<mirror::Class> char_class(hs.NewHandle( 308 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 309 // The primitive char class won't be initialized by 310 // InitializePrimitiveClass until line 459, but strings (and 311 // internal char arrays) will be allocated before that and the 312 // component size, which is computed from the primitive type, needs 313 // to be set here. 314 char_class->SetPrimitiveType(Primitive::kPrimChar); 315 316 // Setup the char[] class to be used for String. 317 Handle<mirror::Class> char_array_class(hs.NewHandle( 318 AllocClass(self, java_lang_Class.Get(), 319 mirror::Array::ClassSize()))); 320 char_array_class->SetComponentType(char_class.Get()); 321 mirror::CharArray::SetArrayClass(char_array_class.Get()); 322 323 // Setup String. 324 Handle<mirror::Class> java_lang_String(hs.NewHandle( 325 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 326 mirror::String::SetClass(java_lang_String.Get()); 327 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 328 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 329 330 // Setup Reference. 331 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 332 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 333 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 334 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 335 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 336 337 // Create storage for root classes, save away our work so far (requires descriptors). 338 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 339 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 340 kClassRootsMax)); 341 CHECK(!class_roots_.IsNull()); 342 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 343 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 344 SetClassRoot(kClassArrayClass, class_array_class.Get()); 345 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 346 SetClassRoot(kCharArrayClass, char_array_class.Get()); 347 SetClassRoot(kJavaLangString, java_lang_String.Get()); 348 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 349 350 // Setup the primitive type classes. 351 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 352 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 353 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 354 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 355 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 356 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 357 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 358 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 359 360 // Create array interface entries to populate once we can load system classes. 361 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 362 363 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 364 Handle<mirror::Class> int_array_class(hs.NewHandle( 365 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 366 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 367 mirror::IntArray::SetArrayClass(int_array_class.Get()); 368 SetClassRoot(kIntArrayClass, int_array_class.Get()); 369 370 // now that these are registered, we can use AllocClass() and AllocObjectArray 371 372 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 373 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 374 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 375 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 376 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 377 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 378 379 // Constructor, Field, Method, and AbstractMethod are necessary so 380 // that FindClass can link members. 381 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 382 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 383 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 384 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 385 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 386 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 387 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 388 389 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 390 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 391 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 392 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 393 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 394 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 395 396 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 397 398 // Set up array classes for string, field, method 399 Handle<mirror::Class> object_array_string(hs.NewHandle( 400 AllocClass(self, java_lang_Class.Get(), 401 mirror::ObjectArray<mirror::String>::ClassSize()))); 402 object_array_string->SetComponentType(java_lang_String.Get()); 403 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 404 405 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 406 AllocClass(self, java_lang_Class.Get(), 407 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 408 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 409 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 410 411 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 412 AllocClass(self, java_lang_Class.Get(), 413 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 414 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 415 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 416 417 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 418 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 419 // these roots. 420 CHECK_NE(0U, boot_class_path.size()); 421 for (size_t i = 0; i != boot_class_path.size(); ++i) { 422 const DexFile* dex_file = boot_class_path[i]; 423 CHECK(dex_file != nullptr); 424 AppendToBootClassPath(self, *dex_file); 425 } 426 427 // now we can use FindSystemClass 428 429 // run char class through InitializePrimitiveClass to finish init 430 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 431 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 432 433 // Create runtime resolution and imt conflict methods. Also setup the default imt. 434 Runtime* runtime = Runtime::Current(); 435 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 436 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 437 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 438 439 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 440 // we do not need friend classes or a publicly exposed setter. 441 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 442 if (!runtime->IsCompiler()) { 443 // We need to set up the generic trampolines since we don't have an image. 444 quick_resolution_trampoline_ = GetQuickResolutionStub(); 445 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 446 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 447 } 448 449 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 450 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 452 CHECK_EQ(java_lang_Object.Get(), Object_class); 453 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 454 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 455 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 456 std::ostringstream os1, os2; 457 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 458 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 459 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 460 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 461 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 462 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 463 CHECK_EQ(java_lang_String.Get(), String_class); 464 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 465 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 466 467 // Setup the primitive array type classes - can't be done until Object has a vtable. 468 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 469 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 470 471 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 472 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 473 474 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 475 CHECK_EQ(char_array_class.Get(), found_char_array_class); 476 477 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 478 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 479 480 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 481 CHECK_EQ(int_array_class.Get(), found_int_array_class); 482 483 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 484 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 485 486 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 487 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 488 489 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 490 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 491 492 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 493 CHECK_EQ(class_array_class.Get(), found_class_array_class); 494 495 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 496 CHECK_EQ(object_array_class.Get(), found_object_array_class); 497 498 // Setup the single, global copy of "iftable". 499 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 500 CHECK(java_lang_Cloneable != nullptr); 501 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 502 CHECK(java_io_Serializable != nullptr); 503 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 504 // crawl up and explicitly list all of the supers as well. 505 { 506 mirror::IfTable* array_iftable = array_iftable_.Read(); 507 array_iftable->SetInterface(0, java_lang_Cloneable); 508 array_iftable->SetInterface(1, java_io_Serializable); 509 } 510 511 // Sanity check Class[] and Object[]'s interfaces. 512 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 513 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 514 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 515 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 516 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 517 // dex_cache_ fields and register them in class_table_. 518 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 519 CHECK_EQ(java_lang_Class.Get(), Class_class); 520 521 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 522 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 523 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 524 525 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 526 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 527 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 528 529 mirror::Class* String_array_class = 530 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 531 CHECK_EQ(object_array_string.Get(), String_array_class); 532 533 mirror::Class* Art_method_array_class = 534 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 535 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 536 537 mirror::Class* Art_field_array_class = 538 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 539 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 540 541 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 542 543 // Create java.lang.reflect.Proxy root. 544 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 545 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 546 547 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 548 // finish initializing Reference class 549 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 550 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 551 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 552 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 553 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 554 mirror::Class* java_lang_ref_FinalizerReference = 555 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 556 java_lang_ref_FinalizerReference->SetAccessFlags( 557 java_lang_ref_FinalizerReference->GetAccessFlags() | 558 kAccClassIsReference | kAccClassIsFinalizerReference); 559 mirror::Class* java_lang_ref_PhantomReference = 560 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 561 java_lang_ref_PhantomReference->SetAccessFlags( 562 java_lang_ref_PhantomReference->GetAccessFlags() | 563 kAccClassIsReference | kAccClassIsPhantomReference); 564 mirror::Class* java_lang_ref_SoftReference = 565 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 566 java_lang_ref_SoftReference->SetAccessFlags( 567 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 568 mirror::Class* java_lang_ref_WeakReference = 569 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 570 java_lang_ref_WeakReference->SetAccessFlags( 571 java_lang_ref_WeakReference->GetAccessFlags() | 572 kAccClassIsReference | kAccClassIsWeakReference); 573 574 // Setup the ClassLoader, verifying the object_size_. 575 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 576 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 577 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 578 579 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 580 // java.lang.StackTraceElement as a convenience. 581 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 582 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 583 SetClassRoot(kJavaLangClassNotFoundException, 584 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 585 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 586 SetClassRoot(kJavaLangStackTraceElementArrayClass, 587 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 588 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 589 590 FinishInit(self); 591 592 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 593} 594 595void ClassLinker::FinishInit(Thread* self) { 596 VLOG(startup) << "ClassLinker::FinishInit entering"; 597 598 // Let the heap know some key offsets into java.lang.ref instances 599 // Note: we hard code the field indexes here rather than using FindInstanceField 600 // as the types of the field can't be resolved prior to the runtime being 601 // fully initialized 602 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 603 mirror::Class* java_lang_ref_FinalizerReference = 604 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 605 606 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 607 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 608 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 609 610 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 611 CHECK_STREQ(queue->GetName(), "queue"); 612 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 613 614 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 615 CHECK_STREQ(queueNext->GetName(), "queueNext"); 616 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 617 618 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 619 CHECK_STREQ(referent->GetName(), "referent"); 620 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 621 622 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 623 CHECK_STREQ(zombie->GetName(), "zombie"); 624 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 625 626 // ensure all class_roots_ are initialized 627 for (size_t i = 0; i < kClassRootsMax; i++) { 628 ClassRoot class_root = static_cast<ClassRoot>(i); 629 mirror::Class* klass = GetClassRoot(class_root); 630 CHECK(klass != nullptr); 631 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 632 // note SetClassRoot does additional validation. 633 // if possible add new checks there to catch errors early 634 } 635 636 CHECK(!array_iftable_.IsNull()); 637 638 // disable the slow paths in FindClass and CreatePrimitiveClass now 639 // that Object, Class, and Object[] are setup 640 init_done_ = true; 641 642 VLOG(startup) << "ClassLinker::FinishInit exiting"; 643} 644 645void ClassLinker::RunRootClinits() { 646 Thread* self = Thread::Current(); 647 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 648 mirror::Class* c = GetClassRoot(ClassRoot(i)); 649 if (!c->IsArrayClass() && !c->IsPrimitive()) { 650 StackHandleScope<1> hs(self); 651 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 652 EnsureInitialized(self, h_class, true, true); 653 self->AssertNoPendingException(); 654 } 655 } 656} 657 658bool ClassLinker::GenerateOatFile(const char* dex_filename, 659 int oat_fd, 660 const char* oat_cache_filename, 661 std::string* error_msg) { 662 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 663 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 664 665 gc::Heap* heap = Runtime::Current()->GetHeap(); 666 std::string boot_image_option("--boot-image="); 667 if (heap->GetImageSpace() == nullptr) { 668 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 669 // out of space anyway it might not matter. 670 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 671 "without an image.", dex_filename); 672 return false; 673 } 674 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 675 676 std::string dex_file_option("--dex-file="); 677 dex_file_option += dex_filename; 678 679 std::string oat_fd_option("--oat-fd="); 680 StringAppendF(&oat_fd_option, "%d", oat_fd); 681 682 std::string oat_location_option("--oat-location="); 683 oat_location_option += oat_cache_filename; 684 685 std::vector<std::string> argv; 686 argv.push_back(dex2oat); 687 argv.push_back("--runtime-arg"); 688 argv.push_back("-classpath"); 689 argv.push_back("--runtime-arg"); 690 argv.push_back(Runtime::Current()->GetClassPathString()); 691 692 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 693 694 if (!Runtime::Current()->IsVerificationEnabled()) { 695 argv.push_back("--compiler-filter=verify-none"); 696 } 697 698 if (Runtime::Current()->MustRelocateIfPossible()) { 699 argv.push_back("--runtime-arg"); 700 argv.push_back("-Xrelocate"); 701 } else { 702 argv.push_back("--runtime-arg"); 703 argv.push_back("-Xnorelocate"); 704 } 705 706 if (!kIsTargetBuild) { 707 argv.push_back("--host"); 708 } 709 710 argv.push_back(boot_image_option); 711 argv.push_back(dex_file_option); 712 argv.push_back(oat_fd_option); 713 argv.push_back(oat_location_option); 714 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 715 for (size_t i = 0; i < compiler_options.size(); ++i) { 716 argv.push_back(compiler_options[i].c_str()); 717 } 718 719 return Exec(argv, error_msg); 720} 721 722const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 723 WriterMutexLock mu(Thread::Current(), dex_lock_); 724 if (kIsDebugBuild) { 725 for (size_t i = 0; i < oat_files_.size(); ++i) { 726 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 727 } 728 } 729 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 730 oat_files_.push_back(oat_file); 731 return oat_file; 732} 733 734OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 735 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 736 OatFile* oat_file = space->ReleaseOatFile(); 737 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 738 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 739 return *oat_file; 740} 741 742const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 743 const char* dex_location = dex_file.GetLocation().c_str(); 744 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 745 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 746} 747 748const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 749 const char* dex_location, 750 const uint32_t* dex_location_checksum) { 751 ReaderMutexLock mu(Thread::Current(), dex_lock_); 752 for (const OatFile* oat_file : oat_files_) { 753 DCHECK(oat_file != nullptr); 754 755 if (oat_location != nullptr) { 756 if (oat_file->GetLocation() != oat_location) { 757 continue; 758 } 759 } 760 761 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 762 dex_location_checksum, 763 false); 764 if (oat_dex_file != nullptr) { 765 return oat_dex_file; 766 } 767 } 768 return nullptr; 769} 770 771 772// Loads all multi dex files from the given oat file returning true on success. 773// 774// Parameters: 775// oat_file - the oat file to load from 776// dex_location - the dex location used to generate the oat file 777// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 778// generated - whether or not the oat_file existed before or was just (re)generated 779// error_msgs - any error messages will be appended here 780// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 781static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 782 const char* dex_location, 783 const uint32_t* dex_location_checksum, 784 bool generated, 785 std::vector<std::string>* error_msgs, 786 std::vector<const DexFile*>* dex_files) { 787 if (oat_file == nullptr) { 788 return false; 789 } 790 791 size_t old_size = dex_files->size(); // To rollback on error. 792 793 bool success = true; 794 for (size_t i = 0; success; ++i) { 795 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 796 const char* next_name = next_name_str.c_str(); 797 798 uint32_t next_location_checksum; 799 uint32_t* next_location_checksum_pointer = &next_location_checksum; 800 std::string error_msg; 801 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 802 // When i=0 the multidex name should be the same as the location name. We already have the 803 // checksum it so we don't need to recompute it. 804 if (dex_location_checksum == nullptr) { 805 next_location_checksum_pointer = nullptr; 806 } else { 807 next_location_checksum = *dex_location_checksum; 808 } 809 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 810 DCHECK_EQ(false, i == 0 && generated); 811 next_location_checksum_pointer = nullptr; 812 } 813 814 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 815 816 if (oat_dex_file == nullptr) { 817 if (i == 0 && generated) { 818 std::string error_msg; 819 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 820 " file'%s'", dex_location, next_location_checksum, 821 oat_file->GetLocation().c_str()); 822 error_msgs->push_back(error_msg); 823 } 824 break; // Not found, done. 825 } 826 827 // Checksum test. Test must succeed when generated. 828 success = !generated; 829 if (next_location_checksum_pointer != nullptr) { 830 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 831 } 832 833 if (success) { 834 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 835 if (dex_file == nullptr) { 836 success = false; 837 error_msgs->push_back(error_msg); 838 } else { 839 dex_files->push_back(dex_file); 840 } 841 } 842 843 // When we generated the file, we expect success, or something is terribly wrong. 844 CHECK_EQ(false, generated && !success) 845 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 846 << std::hex << " dex_location_checksum=" << next_location_checksum 847 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 848 } 849 850 if (dex_files->size() == old_size) { 851 success = false; // We did not even find classes.dex 852 } 853 854 if (success) { 855 return true; 856 } else { 857 // Free all the dex files we have loaded. 858 auto it = dex_files->begin() + old_size; 859 auto it_end = dex_files->end(); 860 for (; it != it_end; it++) { 861 delete *it; 862 } 863 dex_files->erase(dex_files->begin() + old_size, it_end); 864 865 return false; 866 } 867} 868 869// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 870// complicates the loading process, as we should not use an iterative loading process, because that 871// would register the oat file and dex files that come before the broken one. Instead, check all 872// multidex ahead of time. 873bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 874 std::vector<std::string>* error_msgs, 875 std::vector<const DexFile*>* dex_files) { 876 // 1) Check whether we have an open oat file. 877 // This requires a dex checksum, use the "primary" one. 878 uint32_t dex_location_checksum; 879 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 880 bool have_checksum = true; 881 std::string checksum_error_msg; 882 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 883 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 884 dex_location_checksum_pointer = nullptr; 885 have_checksum = false; 886 } 887 888 bool needs_registering = false; 889 890 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 891 dex_location_checksum_pointer); 892 std::unique_ptr<const OatFile> open_oat_file( 893 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 894 895 // 2) If we do not have an open one, maybe there's one on disk already. 896 897 // In case the oat file is not open, we play a locking game here so 898 // that if two different processes race to load and register or generate 899 // (or worse, one tries to open a partial generated file) we will be okay. 900 // This is actually common with apps that use DexClassLoader to work 901 // around the dex method reference limit and that have a background 902 // service running in a separate process. 903 ScopedFlock scoped_flock; 904 905 if (open_oat_file.get() == nullptr) { 906 if (oat_location != nullptr) { 907 // Can only do this if we have a checksum, else error. 908 if (!have_checksum) { 909 error_msgs->push_back(checksum_error_msg); 910 return false; 911 } 912 913 std::string error_msg; 914 915 // We are loading or creating one in the future. Time to set up the file lock. 916 if (!scoped_flock.Init(oat_location, &error_msg)) { 917 error_msgs->push_back(error_msg); 918 return false; 919 } 920 921 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 922 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 923 oat_location, &error_msg)); 924 925 if (open_oat_file.get() == nullptr) { 926 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 927 dex_location, oat_location, error_msg.c_str()); 928 VLOG(class_linker) << compound_msg; 929 error_msgs->push_back(compound_msg); 930 } 931 } else { 932 // TODO: What to lock here? 933 bool obsolete_file_cleanup_failed; 934 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 935 dex_location_checksum_pointer, 936 kRuntimeISA, error_msgs, 937 &obsolete_file_cleanup_failed)); 938 // There's no point in going forward and eventually try to regenerate the 939 // file if we couldn't remove the obsolete one. Mostly likely we will fail 940 // with the same error when trying to write the new file. 941 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 942 if (obsolete_file_cleanup_failed) { 943 return false; 944 } 945 } 946 needs_registering = true; 947 } 948 949 // 3) If we have an oat file, check all contained multidex files for our dex_location. 950 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 951 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 952 dex_location_checksum_pointer, 953 false, error_msgs, dex_files); 954 if (success) { 955 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 956 if (needs_registering) { 957 // We opened the oat file, so we must register it. 958 RegisterOatFile(oat_file); 959 } 960 // If the file isn't executable we failed patchoat but did manage to get the dex files. 961 return oat_file->IsExecutable(); 962 } else { 963 if (needs_registering) { 964 // We opened it, delete it. 965 open_oat_file.reset(); 966 } else { 967 open_oat_file.release(); // Do not delete open oat files. 968 } 969 } 970 971 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 972 973 // Need a checksum, fail else. 974 if (!have_checksum) { 975 error_msgs->push_back(checksum_error_msg); 976 return false; 977 } 978 979 // Look in cache location if no oat_location is given. 980 std::string cache_location; 981 if (oat_location == nullptr) { 982 // Use the dalvik cache. 983 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 984 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 985 oat_location = cache_location.c_str(); 986 } 987 988 bool has_flock = true; 989 // Definitely need to lock now. 990 if (!scoped_flock.HasFile()) { 991 std::string error_msg; 992 if (!scoped_flock.Init(oat_location, &error_msg)) { 993 error_msgs->push_back(error_msg); 994 has_flock = false; 995 } 996 } 997 998 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 999 // Create the oat file. 1000 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1001 oat_location, error_msgs)); 1002 } 1003 1004 // Failed, bail. 1005 if (open_oat_file.get() == nullptr) { 1006 std::string error_msg; 1007 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1008 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1009 error_msgs->push_back(error_msg); 1010 return false; 1011 } 1012 1013 // Try to load again, but stronger checks. 1014 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1015 dex_location_checksum_pointer, 1016 true, error_msgs, dex_files); 1017 if (success) { 1018 RegisterOatFile(open_oat_file.release()); 1019 return true; 1020 } else { 1021 return false; 1022 } 1023} 1024 1025const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1026 uint32_t dex_location_checksum, 1027 const char* oat_location, 1028 std::string* error_msg) { 1029 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1030 !Runtime::Current()->IsCompiler(), 1031 error_msg)); 1032 if (oat_file.get() == nullptr) { 1033 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1034 error_msg->c_str()); 1035 return nullptr; 1036 } 1037 Runtime* runtime = Runtime::Current(); 1038 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1039 if (image_space != nullptr) { 1040 const ImageHeader& image_header = image_space->GetImageHeader(); 1041 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1042 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1043 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1044 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1045 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1046 actual_image_oat_checksum); 1047 return nullptr; 1048 } 1049 1050 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1051 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1052 if (expected_image_oat_offset != actual_image_oat_offset) { 1053 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1054 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1055 actual_image_oat_offset); 1056 return nullptr; 1057 } 1058 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1059 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1060 if (expected_patch_delta != actual_patch_delta) { 1061 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1062 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1063 return nullptr; 1064 } 1065 } 1066 1067 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1068 &dex_location_checksum); 1069 if (oat_dex_file == nullptr) { 1070 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1071 dex_location); 1072 return nullptr; 1073 } 1074 uint32_t expected_dex_checksum = dex_location_checksum; 1075 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1076 if (expected_dex_checksum != actual_dex_checksum) { 1077 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1078 "found 0x%x", oat_location, expected_dex_checksum, 1079 actual_dex_checksum); 1080 return nullptr; 1081 } 1082 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1083 if (dex_file.get() != nullptr) { 1084 return oat_file.release(); 1085 } else { 1086 return nullptr; 1087 } 1088} 1089 1090const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1091 int fd, const char* oat_location, 1092 std::vector<std::string>* error_msgs) { 1093 // Generate the output oat file for the dex file 1094 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1095 std::string error_msg; 1096 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1097 CHECK(!error_msg.empty()); 1098 error_msgs->push_back(error_msg); 1099 return nullptr; 1100 } 1101 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1102 !Runtime::Current()->IsCompiler(), 1103 &error_msg)); 1104 if (oat_file.get() == nullptr) { 1105 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1106 oat_location, error_msg.c_str()); 1107 error_msgs->push_back(compound_msg); 1108 return nullptr; 1109 } 1110 1111 return oat_file.release(); 1112} 1113 1114bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1115 const InstructionSet instruction_set) { 1116 Runtime* runtime = Runtime::Current(); 1117 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1118 if (image_space == nullptr) { 1119 return false; 1120 } 1121 uint32_t image_oat_checksum = 0; 1122 if (instruction_set == kRuntimeISA) { 1123 const ImageHeader& image_header = image_space->GetImageHeader(); 1124 image_oat_checksum = image_header.GetOatChecksum(); 1125 } else { 1126 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1127 image_space->GetImageLocation().c_str(), instruction_set)); 1128 image_oat_checksum = image_header->GetOatChecksum(); 1129 } 1130 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1131} 1132 1133bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1134 const InstructionSet instruction_set, 1135 std::string* error_msg) { 1136 Runtime* runtime = Runtime::Current(); 1137 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1138 if (image_space == nullptr) { 1139 *error_msg = "No image space for verification against"; 1140 return false; 1141 } 1142 1143 // If the requested instruction set is the same as the current runtime, 1144 // we can use the checksums directly. If it isn't, we'll have to read the 1145 // image header from the image for the right instruction set. 1146 uint32_t image_oat_checksum = 0; 1147 uintptr_t image_oat_data_begin = 0; 1148 int32_t image_patch_delta = 0; 1149 if (instruction_set == runtime->GetInstructionSet()) { 1150 const ImageHeader& image_header = image_space->GetImageHeader(); 1151 image_oat_checksum = image_header.GetOatChecksum(); 1152 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1153 image_patch_delta = image_header.GetPatchDelta(); 1154 } else { 1155 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1156 image_space->GetImageLocation().c_str(), instruction_set)); 1157 image_oat_checksum = image_header->GetOatChecksum(); 1158 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1159 image_patch_delta = image_header->GetPatchDelta(); 1160 } 1161 const OatHeader& oat_header = oat_file->GetOatHeader(); 1162 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1163 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1164 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1165 if (!ret) { 1166 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1167 oat_file->GetLocation().c_str(), 1168 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1169 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1170 oat_file->GetOatHeader().GetImagePatchDelta(), 1171 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1172 } 1173 return ret; 1174} 1175 1176bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1177 const char* dex_location, 1178 uint32_t dex_location_checksum, 1179 const InstructionSet instruction_set, 1180 std::string* error_msg) { 1181 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1182 return false; 1183 } 1184 1185 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1186 &dex_location_checksum); 1187 if (oat_dex_file == nullptr) { 1188 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1189 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1190 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1191 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1192 oat_file->GetLocation().c_str(), 1193 oat_dex_file->GetDexFileLocation().c_str(), 1194 oat_dex_file->GetDexFileLocationChecksum()); 1195 } 1196 return false; 1197 } 1198 1199 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1200 return true; 1201} 1202 1203bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1204 const char* dex_location, 1205 const uint32_t* dex_location_checksum, 1206 std::string* error_msg) { 1207 CHECK(oat_file != nullptr); 1208 CHECK(dex_location != nullptr); 1209 std::unique_ptr<const DexFile> dex_file; 1210 if (dex_location_checksum == nullptr) { 1211 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1212 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1213 // directory. 1214 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1215 if (oat_dex_file == nullptr) { 1216 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1217 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1218 error_msg->c_str()); 1219 return false; 1220 } 1221 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1222 } else { 1223 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1224 kRuntimeISA, error_msg); 1225 if (!verified) { 1226 return false; 1227 } 1228 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1229 dex_location_checksum)->OpenDexFile(error_msg)); 1230 } 1231 return dex_file.get() != nullptr; 1232} 1233 1234const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1235 const char* dex_location, 1236 const uint32_t* dex_location_checksum, 1237 InstructionSet isa, 1238 std::vector<std::string>* error_msgs, 1239 bool* obsolete_file_cleanup_failed) { 1240 *obsolete_file_cleanup_failed = false; 1241 bool already_opened = false; 1242 std::string dex_location_str(dex_location); 1243 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1244 &already_opened, 1245 obsolete_file_cleanup_failed, 1246 error_msgs)); 1247 std::string error_msg; 1248 if (oat_file.get() == nullptr) { 1249 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1250 dex_location)); 1251 return nullptr; 1252 } else if (oat_file->IsExecutable() && 1253 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1254 dex_location_checksum, &error_msg)) { 1255 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1256 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1257 error_msg.c_str())); 1258 return nullptr; 1259 } else if (!oat_file->IsExecutable() && 1260 Runtime::Current()->GetHeap()->HasImageSpace() && 1261 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1262 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1263 "dex location '%s'. Image checksum incorrect.", 1264 oat_file->GetLocation().c_str(), dex_location)); 1265 return nullptr; 1266 } else { 1267 return oat_file.release(); 1268 } 1269} 1270 1271const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1272 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1273 for (size_t i = 0; i < oat_files_.size(); i++) { 1274 const OatFile* oat_file = oat_files_[i]; 1275 DCHECK(oat_file != nullptr); 1276 if (oat_file->GetLocation() == oat_location) { 1277 return oat_file; 1278 } 1279 } 1280 return nullptr; 1281} 1282 1283const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1284 InstructionSet isa, 1285 bool *already_opened, 1286 bool *obsolete_file_cleanup_failed, 1287 std::vector<std::string>* error_msgs) { 1288 // Find out if we've already opened the file 1289 const OatFile* ret = nullptr; 1290 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1291 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1292 if (ret != nullptr) { 1293 *already_opened = true; 1294 return ret; 1295 } 1296 1297 std::string dalvik_cache; 1298 bool have_android_data = false; 1299 bool have_dalvik_cache = false; 1300 bool is_global_cache = false; 1301 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1302 &have_android_data, &have_dalvik_cache, &is_global_cache); 1303 std::string cache_filename; 1304 if (have_dalvik_cache) { 1305 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1306 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1307 if (ret != nullptr) { 1308 *already_opened = true; 1309 return ret; 1310 } 1311 } else { 1312 // If we need to relocate we should just place odex back where it started. 1313 cache_filename = odex_filename; 1314 } 1315 1316 ret = nullptr; 1317 1318 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1319 // 1320 // Now we do the following: 1321 // 1) Try and open the odex version 1322 // 2) If present, checksum-verified & relocated correctly return it 1323 // 3) Close the odex version to free up its address space. 1324 // 4) Try and open the cache version 1325 // 5) If present, checksum-verified & relocated correctly return it 1326 // 6) Close the cache version to free up its address space. 1327 // 7) If we should relocate: 1328 // a) If we have opened and checksum-verified the odex version relocate it to 1329 // 'cache_filename' and return it 1330 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1331 // it. This should not happen often (I think only the run-test's will hit this case). 1332 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1333 // this point. 1334 // 9) Return nullptr 1335 1336 *already_opened = false; 1337 const Runtime* runtime = Runtime::Current(); 1338 CHECK(runtime != nullptr); 1339 bool executable = !runtime->IsCompiler(); 1340 1341 std::string odex_error_msg; 1342 bool should_patch_system = false; 1343 bool odex_checksum_verified = false; 1344 bool have_system_odex = false; 1345 { 1346 // There is a high probability that these both these oat files map similar/the same address 1347 // spaces so we must scope them like this so they each gets its turn. 1348 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1349 executable, &odex_error_msg)); 1350 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1351 &odex_checksum_verified, 1352 &odex_error_msg)) { 1353 return odex_oat_file.release(); 1354 } else { 1355 if (odex_checksum_verified) { 1356 // We can just relocate 1357 should_patch_system = true; 1358 odex_error_msg = "Image Patches are incorrect"; 1359 } 1360 if (odex_oat_file.get() != nullptr) { 1361 have_system_odex = true; 1362 } 1363 } 1364 } 1365 1366 std::string cache_error_msg; 1367 bool should_patch_cache = false; 1368 bool cache_checksum_verified = false; 1369 if (have_dalvik_cache) { 1370 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1371 executable, &cache_error_msg)); 1372 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1373 &cache_checksum_verified, 1374 &cache_error_msg)) { 1375 return cache_oat_file.release(); 1376 } else if (cache_checksum_verified) { 1377 // We can just relocate 1378 should_patch_cache = true; 1379 cache_error_msg = "Image Patches are incorrect"; 1380 } 1381 } else if (have_android_data) { 1382 // dalvik_cache does not exist but android data does. This means we should be able to create 1383 // it, so we should try. 1384 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1385 } 1386 1387 ret = nullptr; 1388 std::string error_msg; 1389 if (runtime->CanRelocate()) { 1390 // Run relocation 1391 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1392 if (space != nullptr) { 1393 const std::string& image_location = space->GetImageLocation(); 1394 if (odex_checksum_verified && should_patch_system) { 1395 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1396 } else if (cache_checksum_verified && should_patch_cache) { 1397 CHECK(have_dalvik_cache); 1398 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1399 } 1400 } else if (have_system_odex) { 1401 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1402 } 1403 } 1404 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1405 // implicitly: were able to fine where the cached version is but we were unable to use it, 1406 // either as a destination for relocation or to open a file. We should delete it if it is 1407 // there. 1408 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1409 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1410 "searching for dex file %s: %s", 1411 cache_filename.c_str(), dex_location.c_str(), 1412 strerror(errno)); 1413 error_msgs->push_back(rm_error_msg); 1414 VLOG(class_linker) << rm_error_msg; 1415 // Let the caller know that we couldn't remove the obsolete file. 1416 // This is a good indication that further writes may fail as well. 1417 *obsolete_file_cleanup_failed = true; 1418 } 1419 } 1420 if (ret == nullptr) { 1421 VLOG(class_linker) << error_msg; 1422 error_msgs->push_back(error_msg); 1423 std::string relocation_msg; 1424 if (runtime->CanRelocate()) { 1425 relocation_msg = StringPrintf(" and relocation failed"); 1426 } 1427 if (have_dalvik_cache && cache_checksum_verified) { 1428 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1429 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1430 cache_filename.c_str(), cache_error_msg.c_str(), 1431 relocation_msg.c_str()); 1432 } else { 1433 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1434 "dalvik_cache availible)%s.", odex_filename.c_str(), 1435 odex_error_msg.c_str(), relocation_msg.c_str()); 1436 } 1437 VLOG(class_linker) << error_msg; 1438 error_msgs->push_back(error_msg); 1439 } 1440 return ret; 1441} 1442 1443const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1444 InstructionSet isa, 1445 std::string* error_msg) { 1446 // We open it non-executable 1447 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1448 if (output.get() == nullptr) { 1449 return nullptr; 1450 } 1451 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1452 VerifyOatImageChecksum(output.get(), isa)) { 1453 return output.release(); 1454 } else { 1455 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1456 oat_path.c_str()); 1457 return nullptr; 1458 } 1459} 1460 1461const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1462 const std::string& output_oat, 1463 const std::string& image_location, 1464 InstructionSet isa, 1465 std::string* error_msg) { 1466 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1467 // We don't have an image space so there is no point in trying to patchoat. 1468 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1469 << "running without an image. Attempting to use oat file for interpretation."; 1470 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1471 } 1472 if (!Runtime::Current()->IsDex2OatEnabled()) { 1473 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1474 // input_oat but make sure we only do interpretation on it's dex files. 1475 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1476 << "disabled. Attempting to use oat file for interpretation"; 1477 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1478 } 1479 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1480 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1481 1482 std::string isa_arg("--instruction-set="); 1483 isa_arg += GetInstructionSetString(isa); 1484 std::string input_oat_filename_arg("--input-oat-file="); 1485 input_oat_filename_arg += input_oat; 1486 std::string output_oat_filename_arg("--output-oat-file="); 1487 output_oat_filename_arg += output_oat; 1488 std::string patched_image_arg("--patched-image-location="); 1489 patched_image_arg += image_location; 1490 1491 std::vector<std::string> argv; 1492 argv.push_back(patchoat); 1493 argv.push_back(isa_arg); 1494 argv.push_back(input_oat_filename_arg); 1495 argv.push_back(output_oat_filename_arg); 1496 argv.push_back(patched_image_arg); 1497 1498 std::string command_line(Join(argv, ' ')); 1499 LOG(INFO) << "Relocate Oat File: " << command_line; 1500 bool success = Exec(argv, error_msg); 1501 if (success) { 1502 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1503 !Runtime::Current()->IsCompiler(), error_msg)); 1504 bool checksum_verified = false; 1505 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1506 return output.release(); 1507 } else if (output.get() != nullptr) { 1508 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1509 "but output file '%s' failed verifcation: %s", 1510 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1511 } else { 1512 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1513 "but was unable to open output file '%s': %s", 1514 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1515 } 1516 } else if (!Runtime::Current()->IsCompiler()) { 1517 // patchoat failed which means we probably don't have enough room to place the output oat file, 1518 // instead of failing we should just run the interpreter from the dex files in the input oat. 1519 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1520 << "for interpretation. patchoat failure was: " << *error_msg; 1521 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1522 } else { 1523 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1524 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1525 error_msg->c_str()); 1526 } 1527 return nullptr; 1528} 1529 1530int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1531 Runtime* runtime = Runtime::Current(); 1532 int32_t real_patch_delta; 1533 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1534 CHECK(image_space != nullptr); 1535 if (isa == Runtime::Current()->GetInstructionSet()) { 1536 const ImageHeader& image_header = image_space->GetImageHeader(); 1537 real_patch_delta = image_header.GetPatchDelta(); 1538 } else { 1539 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1540 image_space->GetImageLocation().c_str(), isa)); 1541 real_patch_delta = image_header->GetPatchDelta(); 1542 } 1543 const OatHeader& oat_header = oat_file->GetOatHeader(); 1544 return real_patch_delta - oat_header.GetImagePatchDelta(); 1545} 1546 1547bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1548 bool* checksum_verified, 1549 std::string* error_msg) { 1550 Runtime* runtime = Runtime::Current(); 1551 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1552 if (image_space == nullptr) { 1553 *error_msg = "No image space present"; 1554 return false; 1555 } 1556 uint32_t real_image_checksum; 1557 void* real_image_oat_offset; 1558 int32_t real_patch_delta; 1559 if (isa == runtime->GetInstructionSet()) { 1560 const ImageHeader& image_header = image_space->GetImageHeader(); 1561 real_image_checksum = image_header.GetOatChecksum(); 1562 real_image_oat_offset = image_header.GetOatDataBegin(); 1563 real_patch_delta = image_header.GetPatchDelta(); 1564 } else { 1565 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1566 image_space->GetImageLocation().c_str(), isa)); 1567 real_image_checksum = image_header->GetOatChecksum(); 1568 real_image_oat_offset = image_header->GetOatDataBegin(); 1569 real_patch_delta = image_header->GetPatchDelta(); 1570 } 1571 1572 const OatHeader& oat_header = oat_file->GetOatHeader(); 1573 std::string compound_msg; 1574 1575 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1576 *checksum_verified = oat_image_checksum == real_image_checksum; 1577 if (!*checksum_verified) { 1578 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1579 real_image_checksum, oat_image_checksum); 1580 } 1581 1582 void* oat_image_oat_offset = 1583 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1584 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1585 if (!offset_verified) { 1586 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1587 real_image_oat_offset, oat_image_oat_offset); 1588 } 1589 1590 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1591 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1592 if (!patch_delta_verified) { 1593 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1594 real_patch_delta, oat_patch_delta); 1595 } 1596 1597 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1598 if (!ret) { 1599 *error_msg = "Oat file failed to verify:" + compound_msg; 1600 } 1601 return ret; 1602} 1603 1604const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1605 std::string* error_msg) { 1606 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1607 if (oat_file != nullptr) { 1608 return oat_file; 1609 } 1610 1611 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1612 error_msg); 1613} 1614 1615static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1616 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1617 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1618 1619 DCHECK(obj != nullptr); 1620 DCHECK(class_linker != nullptr); 1621 1622 if (obj->IsArtMethod()) { 1623 mirror::ArtMethod* method = obj->AsArtMethod(); 1624 if (!method->IsNative()) { 1625 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 1626 if (method != Runtime::Current()->GetResolutionMethod()) { 1627 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1628 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1629 } 1630 } 1631 } 1632} 1633 1634void ClassLinker::InitFromImage() { 1635 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1636 CHECK(!init_done_); 1637 1638 Thread* self = Thread::Current(); 1639 gc::Heap* heap = Runtime::Current()->GetHeap(); 1640 gc::space::ImageSpace* space = heap->GetImageSpace(); 1641 dex_cache_image_class_lookup_required_ = true; 1642 CHECK(space != nullptr); 1643 OatFile& oat_file = GetImageOatFile(space); 1644 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1645 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1646 const char* image_file_location = oat_file.GetOatHeader(). 1647 GetStoreValueByKey(OatHeader::kImageLocationKey); 1648 CHECK(image_file_location == nullptr || *image_file_location == 0); 1649 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1650 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1651 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1652 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1653 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1654 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1655 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1656 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1657 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1658 1659 StackHandleScope<1> hs(self); 1660 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1661 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1662 AsObjectArray<mirror::Class>())); 1663 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1664 1665 // Special case of setting up the String class early so that we can test arbitrary objects 1666 // as being Strings or not 1667 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1668 1669 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1670 static_cast<uint32_t>(dex_caches->GetLength())); 1671 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1672 StackHandleScope<1> hs(self); 1673 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1674 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1675 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1676 nullptr); 1677 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1678 std::string error_msg; 1679 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1680 if (dex_file == nullptr) { 1681 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1682 << " from within oat file " << oat_file.GetLocation() 1683 << " error '" << error_msg << "'"; 1684 } 1685 1686 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1687 1688 AppendToBootClassPath(*dex_file, dex_cache); 1689 } 1690 1691 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1692 // bitmap walk. 1693 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1694 1695 // Set entry point to interpreter if in InterpretOnly mode. 1696 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1697 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1698 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1699 } 1700 1701 // reinit class_roots_ 1702 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1703 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1704 1705 // reinit array_iftable_ from any array class instance, they should be == 1706 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1707 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1708 // String class root was set above 1709 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1710 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1711 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1712 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1713 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1714 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1715 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1716 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1717 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1718 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1719 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1720 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1721 1722 FinishInit(self); 1723 1724 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1725} 1726 1727void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1728 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1729 if ((flags & kVisitRootFlagAllRoots) != 0) { 1730 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1731 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1732 } 1733 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1734 for (auto& pair : new_class_roots_) { 1735 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1736 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1737 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1738 if (UNLIKELY(new_ref != old_ref)) { 1739 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1740 // corresponding object. This is slow, but luckily for us, this may only happen with a 1741 // concurrent moving GC. 1742 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1743 it != end && it->first == pair.first; ++it) { 1744 // If the class stored matches the old class, update it to the new value. 1745 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1746 it->second = GcRoot<mirror::Class>(new_ref); 1747 } 1748 } 1749 } 1750 } 1751 } 1752 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1753 new_class_roots_.clear(); 1754 } 1755 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1756 log_new_class_table_roots_ = true; 1757 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1758 log_new_class_table_roots_ = false; 1759 } 1760 // We deliberately ignore the class roots in the image since we 1761 // handle image roots by using the MS/CMS rescanning of dirty cards. 1762} 1763 1764// Keep in sync with InitCallback. Anything we visit, we need to 1765// reinit references to when reinitializing a ClassLinker from a 1766// mapped image. 1767void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1768 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1769 Thread* self = Thread::Current(); 1770 { 1771 ReaderMutexLock mu(self, dex_lock_); 1772 if ((flags & kVisitRootFlagAllRoots) != 0) { 1773 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1774 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1775 } 1776 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1777 for (size_t index : new_dex_cache_roots_) { 1778 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1779 } 1780 } 1781 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1782 new_dex_cache_roots_.clear(); 1783 } 1784 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1785 log_new_dex_caches_roots_ = true; 1786 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1787 log_new_dex_caches_roots_ = false; 1788 } 1789 } 1790 VisitClassRoots(callback, arg, flags); 1791 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1792 DCHECK(!array_iftable_.IsNull()); 1793 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1794 if (!find_array_class_cache_[i].IsNull()) { 1795 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1796 } 1797 } 1798} 1799 1800void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1801 if (dex_cache_image_class_lookup_required_) { 1802 MoveImageClassesToClassTable(); 1803 } 1804 // TODO: why isn't this a ReaderMutexLock? 1805 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1806 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1807 mirror::Class* c = it.second.Read(); 1808 if (!visitor(c, arg)) { 1809 return; 1810 } 1811 } 1812} 1813 1814static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1815 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1816 classes->insert(c); 1817 return true; 1818} 1819 1820struct GetClassesVisitorArrayArg { 1821 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1822 int32_t index; 1823 bool success; 1824}; 1825 1826static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1827 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1828 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1829 if (arg->index < (*arg->classes)->GetLength()) { 1830 (*arg->classes)->Set(arg->index, c); 1831 arg->index++; 1832 return true; 1833 } else { 1834 arg->success = false; 1835 return false; 1836 } 1837} 1838 1839void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1840 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1841 // is avoiding duplicates. 1842 if (!kMovingClasses) { 1843 std::set<mirror::Class*> classes; 1844 VisitClasses(GetClassesVisitorSet, &classes); 1845 for (mirror::Class* klass : classes) { 1846 if (!visitor(klass, arg)) { 1847 return; 1848 } 1849 } 1850 } else { 1851 Thread* self = Thread::Current(); 1852 StackHandleScope<1> hs(self); 1853 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1854 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1855 GetClassesVisitorArrayArg local_arg; 1856 local_arg.classes = &classes; 1857 local_arg.success = false; 1858 // We size the array assuming classes won't be added to the class table during the visit. 1859 // If this assumption fails we iterate again. 1860 while (!local_arg.success) { 1861 size_t class_table_size; 1862 { 1863 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1864 class_table_size = class_table_.size(); 1865 } 1866 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1867 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1868 classes.Assign( 1869 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1870 CHECK(classes.Get() != nullptr); // OOME. 1871 local_arg.index = 0; 1872 local_arg.success = true; 1873 VisitClasses(GetClassesVisitorArray, &local_arg); 1874 } 1875 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1876 // If the class table shrank during creation of the clases array we expect null elements. If 1877 // the class table grew then the loop repeats. If classes are created after the loop has 1878 // finished then we don't visit. 1879 mirror::Class* klass = classes->Get(i); 1880 if (klass != nullptr && !visitor(klass, arg)) { 1881 return; 1882 } 1883 } 1884 } 1885} 1886 1887ClassLinker::~ClassLinker() { 1888 mirror::Class::ResetClass(); 1889 mirror::String::ResetClass(); 1890 mirror::Reference::ResetClass(); 1891 mirror::ArtField::ResetClass(); 1892 mirror::ArtMethod::ResetClass(); 1893 mirror::BooleanArray::ResetArrayClass(); 1894 mirror::ByteArray::ResetArrayClass(); 1895 mirror::CharArray::ResetArrayClass(); 1896 mirror::DoubleArray::ResetArrayClass(); 1897 mirror::FloatArray::ResetArrayClass(); 1898 mirror::IntArray::ResetArrayClass(); 1899 mirror::LongArray::ResetArrayClass(); 1900 mirror::ShortArray::ResetArrayClass(); 1901 mirror::Throwable::ResetClass(); 1902 mirror::StackTraceElement::ResetClass(); 1903 STLDeleteElements(&boot_class_path_); 1904 STLDeleteElements(&oat_files_); 1905} 1906 1907mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1908 gc::Heap* heap = Runtime::Current()->GetHeap(); 1909 StackHandleScope<16> hs(self); 1910 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1911 Handle<mirror::DexCache> dex_cache( 1912 hs.NewHandle(down_cast<mirror::DexCache*>( 1913 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1914 VoidFunctor())))); 1915 if (dex_cache.Get() == nullptr) { 1916 return nullptr; 1917 } 1918 Handle<mirror::String> 1919 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1920 if (location.Get() == nullptr) { 1921 return nullptr; 1922 } 1923 Handle<mirror::ObjectArray<mirror::String>> 1924 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1925 if (strings.Get() == nullptr) { 1926 return nullptr; 1927 } 1928 Handle<mirror::ObjectArray<mirror::Class>> 1929 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1930 if (types.Get() == nullptr) { 1931 return nullptr; 1932 } 1933 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1934 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1935 if (methods.Get() == nullptr) { 1936 return nullptr; 1937 } 1938 Handle<mirror::ObjectArray<mirror::ArtField>> 1939 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1940 if (fields.Get() == nullptr) { 1941 return nullptr; 1942 } 1943 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1944 fields.Get()); 1945 return dex_cache.Get(); 1946} 1947 1948mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1949 uint32_t class_size) { 1950 DCHECK_GE(class_size, sizeof(mirror::Class)); 1951 gc::Heap* heap = Runtime::Current()->GetHeap(); 1952 mirror::Class::InitializeClassVisitor visitor(class_size); 1953 mirror::Object* k = kMovingClasses ? 1954 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1955 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1956 if (UNLIKELY(k == nullptr)) { 1957 CHECK(self->IsExceptionPending()); // OOME. 1958 return nullptr; 1959 } 1960 return k->AsClass(); 1961} 1962 1963mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1964 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1965} 1966 1967mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1968 return down_cast<mirror::ArtField*>( 1969 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1970} 1971 1972mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1973 return down_cast<mirror::ArtMethod*>( 1974 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1975} 1976 1977mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1978 Thread* self, size_t length) { 1979 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1980 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1981} 1982 1983mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1984 mirror::Class* klass) { 1985 DCHECK(klass != nullptr); 1986 1987 // For temporary classes we must wait for them to be retired. 1988 if (init_done_ && klass->IsTemp()) { 1989 CHECK(!klass->IsResolved()); 1990 if (klass->IsErroneous()) { 1991 ThrowEarlierClassFailure(klass); 1992 return nullptr; 1993 } 1994 StackHandleScope<1> hs(self); 1995 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1996 ObjectLock<mirror::Class> lock(self, h_class); 1997 // Loop and wait for the resolving thread to retire this class. 1998 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1999 lock.WaitIgnoringInterrupts(); 2000 } 2001 if (h_class->IsErroneous()) { 2002 ThrowEarlierClassFailure(h_class.Get()); 2003 return nullptr; 2004 } 2005 CHECK(h_class->IsRetired()); 2006 // Get the updated class from class table. 2007 klass = LookupClass(self, descriptor, h_class.Get()->GetClassLoader()); 2008 } 2009 2010 // Wait for the class if it has not already been linked. 2011 if (!klass->IsResolved() && !klass->IsErroneous()) { 2012 StackHandleScope<1> hs(self); 2013 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2014 ObjectLock<mirror::Class> lock(self, h_class); 2015 // Check for circular dependencies between classes. 2016 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2017 ThrowClassCircularityError(h_class.Get()); 2018 h_class->SetStatus(mirror::Class::kStatusError, self); 2019 return nullptr; 2020 } 2021 // Wait for the pending initialization to complete. 2022 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2023 lock.WaitIgnoringInterrupts(); 2024 } 2025 } 2026 2027 if (klass->IsErroneous()) { 2028 ThrowEarlierClassFailure(klass); 2029 return nullptr; 2030 } 2031 // Return the loaded class. No exceptions should be pending. 2032 CHECK(klass->IsResolved()) << PrettyClass(klass); 2033 self->AssertNoPendingException(); 2034 return klass; 2035} 2036 2037typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2038 2039// Search a collection of DexFiles for a descriptor 2040ClassPathEntry FindInClassPath(const char* descriptor, 2041 const std::vector<const DexFile*>& class_path) { 2042 for (size_t i = 0; i != class_path.size(); ++i) { 2043 const DexFile* dex_file = class_path[i]; 2044 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2045 if (dex_class_def != nullptr) { 2046 return ClassPathEntry(dex_file, dex_class_def); 2047 } 2048 } 2049 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2050 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2051 static_cast<const DexFile::ClassDef*>(nullptr)); 2052} 2053 2054mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2055 Thread* self, const char* descriptor, 2056 Handle<mirror::ClassLoader> class_loader) { 2057 if (class_loader->GetClass() != 2058 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2059 class_loader->GetParent()->GetClass() != 2060 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2061 return nullptr; 2062 } 2063 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2064 // Check if this would be found in the parent boot class loader. 2065 if (pair.second != nullptr) { 2066 mirror::Class* klass = LookupClass(self, descriptor, nullptr); 2067 if (klass != nullptr) { 2068 return EnsureResolved(self, descriptor, klass); 2069 } 2070 klass = DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2071 *pair.second); 2072 if (klass != nullptr) { 2073 return klass; 2074 } 2075 CHECK(self->IsExceptionPending()) << descriptor; 2076 self->ClearException(); 2077 } else { 2078 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2079 StackHandleScope<3> hs(self); 2080 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2081 // We need to get the DexPathList and loop through it. 2082 Handle<mirror::ArtField> cookie_field = 2083 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2084 Handle<mirror::ArtField> dex_file_field = 2085 hs.NewHandle( 2086 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2087 mirror::Object* dex_path_list = 2088 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2089 GetObject(class_loader.Get()); 2090 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2091 cookie_field.Get() != nullptr) { 2092 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2093 mirror::Object* dex_elements_obj = 2094 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2095 GetObject(dex_path_list); 2096 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2097 // at the mCookie which is a DexFile vector. 2098 if (dex_elements_obj != nullptr) { 2099 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2100 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2101 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2102 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2103 if (element == nullptr) { 2104 // Should never happen, fall back to java code to throw a NPE. 2105 break; 2106 } 2107 mirror::Object* dex_file = dex_file_field->GetObject(element); 2108 if (dex_file != nullptr) { 2109 const uint64_t cookie = cookie_field->GetLong(dex_file); 2110 auto* dex_files = 2111 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2112 if (dex_files == nullptr) { 2113 // This should never happen so log a warning. 2114 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2115 break; 2116 } 2117 for (const DexFile* dex_file : *dex_files) { 2118 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2119 if (dex_class_def != nullptr) { 2120 RegisterDexFile(*dex_file); 2121 mirror::Class* klass = 2122 DefineClass(self, descriptor, class_loader, *dex_file, *dex_class_def); 2123 if (klass == nullptr) { 2124 CHECK(self->IsExceptionPending()) << descriptor; 2125 self->ClearException(); 2126 return nullptr; 2127 } 2128 return klass; 2129 } 2130 } 2131 } 2132 } 2133 } 2134 } 2135 } 2136 return nullptr; 2137} 2138 2139mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2140 Handle<mirror::ClassLoader> class_loader) { 2141 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2142 DCHECK(self != nullptr); 2143 self->AssertNoPendingException(); 2144 if (descriptor[1] == '\0') { 2145 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2146 // for primitive classes that aren't backed by dex files. 2147 return FindPrimitiveClass(descriptor[0]); 2148 } 2149 // Find the class in the loaded classes table. 2150 mirror::Class* klass = LookupClass(self, descriptor, class_loader.Get()); 2151 if (klass != nullptr) { 2152 return EnsureResolved(self, descriptor, klass); 2153 } 2154 // Class is not yet loaded. 2155 if (descriptor[0] == '[') { 2156 return CreateArrayClass(self, descriptor, class_loader); 2157 } else if (class_loader.Get() == nullptr) { 2158 // The boot class loader, search the boot class path. 2159 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2160 if (pair.second != nullptr) { 2161 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2162 *pair.second); 2163 } else { 2164 // The boot class loader is searched ahead of the application class loader, failures are 2165 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2166 // trigger the chaining with a proper stack trace. 2167 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2168 self->SetException(ThrowLocation(), pre_allocated); 2169 return nullptr; 2170 } 2171 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2172 // First try with the bootstrap class loader. 2173 if (class_loader.Get() != nullptr) { 2174 klass = LookupClass(self, descriptor, nullptr); 2175 if (klass != nullptr) { 2176 return EnsureResolved(self, descriptor, klass); 2177 } 2178 } 2179 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2180 // a NoClassDefFoundError being allocated. 2181 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2182 if (pair.second != nullptr) { 2183 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2184 *pair.second); 2185 } 2186 // Next try the compile time class path. 2187 const std::vector<const DexFile*>* class_path; 2188 { 2189 ScopedObjectAccessUnchecked soa(self); 2190 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2191 soa.AddLocalReference<jobject>(class_loader.Get())); 2192 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2193 } 2194 pair = FindInClassPath(descriptor, *class_path); 2195 if (pair.second != nullptr) { 2196 return DefineClass(self, descriptor, class_loader, *pair.first, *pair.second); 2197 } else { 2198 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2199 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2200 self->SetException(ThrowLocation(), pre_allocated); 2201 return nullptr; 2202 } 2203 } else { 2204 ScopedObjectAccessUnchecked soa(self); 2205 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2206 if (klass != nullptr) { 2207 return klass; 2208 } 2209 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2210 soa.AddLocalReference<jobject>(class_loader.Get())); 2211 std::string class_name_string(DescriptorToDot(descriptor)); 2212 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2213 { 2214 ScopedThreadStateChange tsc(self, kNative); 2215 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2216 soa.Env()->NewStringUTF(class_name_string.c_str())); 2217 if (class_name_object.get() == nullptr) { 2218 DCHECK(self->IsExceptionPending()); // OOME. 2219 return nullptr; 2220 } 2221 CHECK(class_loader_object.get() != nullptr); 2222 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2223 WellKnownClasses::java_lang_ClassLoader_loadClass, 2224 class_name_object.get())); 2225 } 2226 if (self->IsExceptionPending()) { 2227 // If the ClassLoader threw, pass that exception up. 2228 return nullptr; 2229 } else if (result.get() == nullptr) { 2230 // broken loader - throw NPE to be compatible with Dalvik 2231 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2232 class_name_string.c_str()).c_str()); 2233 return nullptr; 2234 } else { 2235 // success, return mirror::Class* 2236 return soa.Decode<mirror::Class*>(result.get()); 2237 } 2238 } 2239 UNREACHABLE(); 2240} 2241 2242mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, 2243 Handle<mirror::ClassLoader> class_loader, 2244 const DexFile& dex_file, 2245 const DexFile::ClassDef& dex_class_def) { 2246 StackHandleScope<3> hs(self); 2247 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2248 bool should_allocate = false; 2249 2250 // Load the class from the dex file. 2251 if (UNLIKELY(!init_done_)) { 2252 // finish up init of hand crafted class_roots_ 2253 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2254 klass.Assign(GetClassRoot(kJavaLangObject)); 2255 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2256 klass.Assign(GetClassRoot(kJavaLangClass)); 2257 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2258 klass.Assign(GetClassRoot(kJavaLangString)); 2259 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2260 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2261 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2262 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2263 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2264 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2265 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2266 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2267 } else { 2268 should_allocate = true; 2269 } 2270 } else { 2271 should_allocate = true; 2272 } 2273 2274 if (should_allocate) { 2275 // Allocate a class with the status of not ready. 2276 // Interface object should get the right size here. Regular class will 2277 // figure out the right size later and be replaced with one of the right 2278 // size when the class becomes resolved. 2279 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2280 } 2281 if (UNLIKELY(klass.Get() == nullptr)) { 2282 CHECK(self->IsExceptionPending()); // Expect an OOME. 2283 return nullptr; 2284 } 2285 klass->SetDexCache(FindDexCache(dex_file)); 2286 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2287 ObjectLock<mirror::Class> lock(self, klass); 2288 if (self->IsExceptionPending()) { 2289 // An exception occured during load, set status to erroneous while holding klass' lock in case 2290 // notification is necessary. 2291 if (!klass->IsErroneous()) { 2292 klass->SetStatus(mirror::Class::kStatusError, self); 2293 } 2294 return nullptr; 2295 } 2296 klass->SetClinitThreadId(self->GetTid()); 2297 2298 // Add the newly loaded class to the loaded classes table. 2299 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2300 if (existing != nullptr) { 2301 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2302 // this thread to block. 2303 return EnsureResolved(self, descriptor, existing); 2304 } 2305 2306 // Finish loading (if necessary) by finding parents 2307 CHECK(!klass->IsLoaded()); 2308 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2309 // Loading failed. 2310 if (!klass->IsErroneous()) { 2311 klass->SetStatus(mirror::Class::kStatusError, self); 2312 } 2313 return nullptr; 2314 } 2315 CHECK(klass->IsLoaded()); 2316 // Link the class (if necessary) 2317 CHECK(!klass->IsResolved()); 2318 // TODO: Use fast jobjects? 2319 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2320 2321 mirror::Class* new_class = nullptr; 2322 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2323 // Linking failed. 2324 if (!klass->IsErroneous()) { 2325 klass->SetStatus(mirror::Class::kStatusError, self); 2326 } 2327 return nullptr; 2328 } 2329 self->AssertNoPendingException(); 2330 CHECK(new_class != nullptr) << descriptor; 2331 CHECK(new_class->IsResolved()) << descriptor; 2332 2333 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2334 2335 /* 2336 * We send CLASS_PREPARE events to the debugger from here. The 2337 * definition of "preparation" is creating the static fields for a 2338 * class and initializing them to the standard default values, but not 2339 * executing any code (that comes later, during "initialization"). 2340 * 2341 * We did the static preparation in LinkClass. 2342 * 2343 * The class has been prepared and resolved but possibly not yet verified 2344 * at this point. 2345 */ 2346 Dbg::PostClassPrepare(new_class_h.Get()); 2347 2348 return new_class_h.Get(); 2349} 2350 2351uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2352 const DexFile::ClassDef& dex_class_def) { 2353 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2354 size_t num_ref = 0; 2355 size_t num_8 = 0; 2356 size_t num_16 = 0; 2357 size_t num_32 = 0; 2358 size_t num_64 = 0; 2359 if (class_data != nullptr) { 2360 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2361 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2362 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2363 char c = descriptor[0]; 2364 switch (c) { 2365 case 'L': 2366 case '[': 2367 num_ref++; 2368 break; 2369 case 'J': 2370 case 'D': 2371 num_64++; 2372 break; 2373 case 'I': 2374 case 'F': 2375 num_32++; 2376 break; 2377 case 'S': 2378 case 'C': 2379 num_16++; 2380 break; 2381 case 'B': 2382 case 'Z': 2383 num_8++; 2384 break; 2385 default: 2386 LOG(FATAL) << "Unknown descriptor: " << c; 2387 } 2388 } 2389 } 2390 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2391} 2392 2393OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2394 bool* found) { 2395 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2396 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2397 if (oat_dex_file == nullptr) { 2398 *found = false; 2399 return OatFile::OatClass::Invalid(); 2400 } 2401 *found = true; 2402 return oat_dex_file->GetOatClass(class_def_idx); 2403} 2404 2405static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2406 uint32_t method_idx) { 2407 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2408 const uint8_t* class_data = dex_file.GetClassData(class_def); 2409 CHECK(class_data != nullptr); 2410 ClassDataItemIterator it(dex_file, class_data); 2411 // Skip fields 2412 while (it.HasNextStaticField()) { 2413 it.Next(); 2414 } 2415 while (it.HasNextInstanceField()) { 2416 it.Next(); 2417 } 2418 // Process methods 2419 size_t class_def_method_index = 0; 2420 while (it.HasNextDirectMethod()) { 2421 if (it.GetMemberIndex() == method_idx) { 2422 return class_def_method_index; 2423 } 2424 class_def_method_index++; 2425 it.Next(); 2426 } 2427 while (it.HasNextVirtualMethod()) { 2428 if (it.GetMemberIndex() == method_idx) { 2429 return class_def_method_index; 2430 } 2431 class_def_method_index++; 2432 it.Next(); 2433 } 2434 DCHECK(!it.HasNext()); 2435 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2436 return 0; 2437} 2438 2439const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2440 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2441 // method for direct methods (or virtual methods made direct). 2442 mirror::Class* declaring_class = method->GetDeclaringClass(); 2443 size_t oat_method_index; 2444 if (method->IsStatic() || method->IsDirect()) { 2445 // Simple case where the oat method index was stashed at load time. 2446 oat_method_index = method->GetMethodIndex(); 2447 } else { 2448 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2449 // by search for its position in the declared virtual methods. 2450 oat_method_index = declaring_class->NumDirectMethods(); 2451 size_t end = declaring_class->NumVirtualMethods(); 2452 bool found = false; 2453 for (size_t i = 0; i < end; i++) { 2454 // Check method index instead of identity in case of duplicate method definitions. 2455 if (method->GetDexMethodIndex() == 2456 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2457 found = true; 2458 break; 2459 } 2460 oat_method_index++; 2461 } 2462 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2463 } 2464 DCHECK_EQ(oat_method_index, 2465 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2466 method->GetDeclaringClass()->GetDexClassDefIndex(), 2467 method->GetDexMethodIndex())); 2468 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2469 declaring_class->GetDexClassDefIndex(), 2470 found); 2471 if (!found) { 2472 return OatFile::OatMethod::Invalid(); 2473 } 2474 *found = true; 2475 return oat_class.GetOatMethod(oat_method_index); 2476} 2477 2478// Special case to get oat code without overwriting a trampoline. 2479const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2480 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2481 if (method->IsProxyMethod()) { 2482 return GetQuickProxyInvokeHandler(); 2483 } 2484 bool found; 2485 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2486 const void* result = nullptr; 2487 if (found) { 2488 result = oat_method.GetQuickCode(); 2489 } 2490 2491 if (result == nullptr) { 2492 if (method->IsNative()) { 2493 // No code and native? Use generic trampoline. 2494 result = GetQuickGenericJniStub(); 2495 } else if (method->IsPortableCompiled()) { 2496 // No code? Do we expect portable code? 2497 result = GetQuickToPortableBridge(); 2498 } else { 2499 // No code? You must mean to go into the interpreter. 2500 result = GetQuickToInterpreterBridge(); 2501 } 2502 } 2503 return result; 2504} 2505 2506const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2507 bool* have_portable_code) { 2508 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2509 *have_portable_code = false; 2510 if (method->IsProxyMethod()) { 2511 return GetPortableProxyInvokeHandler(); 2512 } 2513 bool found; 2514 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2515 const void* result = nullptr; 2516 const void* quick_code = nullptr; 2517 if (found) { 2518 result = oat_method.GetPortableCode(); 2519 quick_code = oat_method.GetQuickCode(); 2520 } 2521 2522 if (result == nullptr) { 2523 if (quick_code == nullptr) { 2524 // No code? You must mean to go into the interpreter. 2525 result = GetPortableToInterpreterBridge(); 2526 } else { 2527 // No code? But there's quick code, so use a bridge. 2528 result = GetPortableToQuickBridge(); 2529 } 2530 } else { 2531 *have_portable_code = true; 2532 } 2533 return result; 2534} 2535 2536const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2537 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2538 return nullptr; 2539 } 2540 bool found; 2541 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2542 return found ? oat_method.GetQuickCode() : nullptr; 2543} 2544 2545const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2546 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2547 return nullptr; 2548 } 2549 bool found; 2550 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2551 return found ? oat_method.GetPortableCode() : nullptr; 2552} 2553 2554const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2555 uint32_t method_idx) { 2556 bool found; 2557 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2558 if (!found) { 2559 return nullptr; 2560 } 2561 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2562 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2563} 2564 2565const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2566 uint32_t method_idx) { 2567 bool found; 2568 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2569 if (!found) { 2570 return nullptr; 2571 } 2572 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2573 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2574} 2575 2576// Returns true if the method must run with interpreter, false otherwise. 2577static bool NeedsInterpreter( 2578 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2579 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2580 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2581 // No code: need interpreter. 2582 // May return true for native code, in the case of generic JNI 2583 // DCHECK(!method->IsNative()); 2584 return true; 2585 } 2586#ifdef ART_SEA_IR_MODE 2587 ScopedObjectAccess soa(Thread::Current()); 2588 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2589 LOG(INFO) << "Found " << PrettyMethod(method); 2590 return false; 2591 } 2592#endif 2593 // If interpreter mode is enabled, every method (except native and proxy) must 2594 // be run with interpreter. 2595 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2596 !method->IsNative() && !method->IsProxyMethod(); 2597} 2598 2599void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2600 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2601 if (klass->NumDirectMethods() == 0) { 2602 return; // No direct methods => no static methods. 2603 } 2604 Runtime* runtime = Runtime::Current(); 2605 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2606 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2607 return; // OAT file unavailable. 2608 } 2609 } 2610 2611 const DexFile& dex_file = klass->GetDexFile(); 2612 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2613 CHECK(dex_class_def != nullptr); 2614 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2615 // There should always be class data if there were direct methods. 2616 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2617 ClassDataItemIterator it(dex_file, class_data); 2618 // Skip fields 2619 while (it.HasNextStaticField()) { 2620 it.Next(); 2621 } 2622 while (it.HasNextInstanceField()) { 2623 it.Next(); 2624 } 2625 bool has_oat_class; 2626 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2627 &has_oat_class); 2628 // Link the code of methods skipped by LinkCode. 2629 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2630 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2631 if (!method->IsStatic()) { 2632 // Only update static methods. 2633 continue; 2634 } 2635 const void* portable_code = nullptr; 2636 const void* quick_code = nullptr; 2637 if (has_oat_class) { 2638 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2639 portable_code = oat_method.GetPortableCode(); 2640 quick_code = oat_method.GetQuickCode(); 2641 } 2642 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2643 bool have_portable_code = false; 2644 if (enter_interpreter) { 2645 // Use interpreter entry point. 2646 // Check whether the method is native, in which case it's generic JNI. 2647 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2648 quick_code = GetQuickGenericJniStub(); 2649 portable_code = GetPortableToQuickBridge(); 2650 } else { 2651 portable_code = GetPortableToInterpreterBridge(); 2652 quick_code = GetQuickToInterpreterBridge(); 2653 } 2654 } else { 2655 if (portable_code == nullptr) { 2656 portable_code = GetPortableToQuickBridge(); 2657 } else { 2658 have_portable_code = true; 2659 } 2660 if (quick_code == nullptr) { 2661 quick_code = GetQuickToPortableBridge(); 2662 } 2663 } 2664 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2665 have_portable_code); 2666 } 2667 // Ignore virtual methods on the iterator. 2668} 2669 2670void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2671 const OatFile::OatClass* oat_class, 2672 const DexFile& dex_file, uint32_t dex_method_index, 2673 uint32_t method_index) { 2674 Runtime* runtime = Runtime::Current(); 2675 if (runtime->IsCompiler()) { 2676 // The following code only applies to a non-compiler runtime. 2677 return; 2678 } 2679 // Method shouldn't have already been linked. 2680 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2681 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2682 if (oat_class != nullptr) { 2683 // Every kind of method should at least get an invoke stub from the oat_method. 2684 // non-abstract methods also get their code pointers. 2685 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2686 oat_method.LinkMethod(method.Get()); 2687 } 2688 2689 // Install entry point from interpreter. 2690 bool enter_interpreter = NeedsInterpreter(method.Get(), 2691 method->GetEntryPointFromQuickCompiledCode(), 2692 method->GetEntryPointFromPortableCompiledCode()); 2693 if (enter_interpreter && !method->IsNative()) { 2694 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2695 } else { 2696 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2697 } 2698 2699 if (method->IsAbstract()) { 2700 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2701 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2702 return; 2703 } 2704 2705 bool have_portable_code = false; 2706 if (method->IsStatic() && !method->IsConstructor()) { 2707 // For static methods excluding the class initializer, install the trampoline. 2708 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2709 // after initializing class (see ClassLinker::InitializeClass method). 2710 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2711 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionStub()); 2712 } else if (enter_interpreter) { 2713 if (!method->IsNative()) { 2714 // Set entry point from compiled code if there's no code or in interpreter only mode. 2715 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2716 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2717 } else { 2718 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2719 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2720 } 2721 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2722 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2723 have_portable_code = true; 2724 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2725 } else { 2726 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2727 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2728 } 2729 2730 if (method->IsNative()) { 2731 // Unregistering restores the dlsym lookup stub. 2732 method->UnregisterNative(); 2733 2734 if (enter_interpreter) { 2735 // We have a native method here without code. Then it should have either the generic JNI 2736 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2737 // TODO: this doesn't handle all the cases where trampolines may be installed. 2738 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2739 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2740 } 2741 } 2742 2743 // Allow instrumentation its chance to hijack code. 2744 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2745 method->GetEntryPointFromQuickCompiledCode(), 2746 method->GetEntryPointFromPortableCompiledCode(), 2747 have_portable_code); 2748} 2749 2750 2751 2752void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2753 const DexFile::ClassDef& dex_class_def, 2754 Handle<mirror::Class> klass, 2755 mirror::ClassLoader* class_loader) { 2756 CHECK(klass.Get() != nullptr); 2757 CHECK(klass->GetDexCache() != nullptr); 2758 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2759 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2760 CHECK(descriptor != nullptr); 2761 2762 klass->SetClass(GetClassRoot(kJavaLangClass)); 2763 if (kUseBakerOrBrooksReadBarrier) { 2764 klass->AssertReadBarrierPointer(); 2765 } 2766 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2767 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2768 klass->SetAccessFlags(access_flags); 2769 klass->SetClassLoader(class_loader); 2770 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2771 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2772 2773 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2774 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2775 2776 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2777 if (class_data == nullptr) { 2778 return; // no fields or methods - for example a marker interface 2779 } 2780 2781 2782 bool has_oat_class = false; 2783 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2784 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2785 &has_oat_class); 2786 if (has_oat_class) { 2787 LoadClassMembers(self, dex_file, class_data, klass, class_loader, &oat_class); 2788 } 2789 } 2790 if (!has_oat_class) { 2791 LoadClassMembers(self, dex_file, class_data, klass, class_loader, nullptr); 2792 } 2793} 2794 2795void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2796 const uint8_t* class_data, 2797 Handle<mirror::Class> klass, 2798 mirror::ClassLoader* class_loader, 2799 const OatFile::OatClass* oat_class) { 2800 // Load fields. 2801 ClassDataItemIterator it(dex_file, class_data); 2802 if (it.NumStaticFields() != 0) { 2803 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2804 if (UNLIKELY(statics == nullptr)) { 2805 CHECK(self->IsExceptionPending()); // OOME. 2806 return; 2807 } 2808 klass->SetSFields(statics); 2809 } 2810 if (it.NumInstanceFields() != 0) { 2811 mirror::ObjectArray<mirror::ArtField>* fields = 2812 AllocArtFieldArray(self, it.NumInstanceFields()); 2813 if (UNLIKELY(fields == nullptr)) { 2814 CHECK(self->IsExceptionPending()); // OOME. 2815 return; 2816 } 2817 klass->SetIFields(fields); 2818 } 2819 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2820 self->AllowThreadSuspension(); 2821 StackHandleScope<1> hs(self); 2822 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2823 if (UNLIKELY(sfield.Get() == nullptr)) { 2824 CHECK(self->IsExceptionPending()); // OOME. 2825 return; 2826 } 2827 klass->SetStaticField(i, sfield.Get()); 2828 LoadField(dex_file, it, klass, sfield); 2829 } 2830 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2831 self->AllowThreadSuspension(); 2832 StackHandleScope<1> hs(self); 2833 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2834 if (UNLIKELY(ifield.Get() == nullptr)) { 2835 CHECK(self->IsExceptionPending()); // OOME. 2836 return; 2837 } 2838 klass->SetInstanceField(i, ifield.Get()); 2839 LoadField(dex_file, it, klass, ifield); 2840 } 2841 2842 // Load methods. 2843 if (it.NumDirectMethods() != 0) { 2844 // TODO: append direct methods to class object 2845 mirror::ObjectArray<mirror::ArtMethod>* directs = 2846 AllocArtMethodArray(self, it.NumDirectMethods()); 2847 if (UNLIKELY(directs == nullptr)) { 2848 CHECK(self->IsExceptionPending()); // OOME. 2849 return; 2850 } 2851 klass->SetDirectMethods(directs); 2852 } 2853 if (it.NumVirtualMethods() != 0) { 2854 // TODO: append direct methods to class object 2855 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2856 AllocArtMethodArray(self, it.NumVirtualMethods()); 2857 if (UNLIKELY(virtuals == nullptr)) { 2858 CHECK(self->IsExceptionPending()); // OOME. 2859 return; 2860 } 2861 klass->SetVirtualMethods(virtuals); 2862 } 2863 size_t class_def_method_index = 0; 2864 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2865 size_t last_class_def_method_index = 0; 2866 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2867 self->AllowThreadSuspension(); 2868 StackHandleScope<1> hs(self); 2869 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2870 if (UNLIKELY(method.Get() == nullptr)) { 2871 CHECK(self->IsExceptionPending()); // OOME. 2872 return; 2873 } 2874 klass->SetDirectMethod(i, method.Get()); 2875 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2876 uint32_t it_method_index = it.GetMemberIndex(); 2877 if (last_dex_method_index == it_method_index) { 2878 // duplicate case 2879 method->SetMethodIndex(last_class_def_method_index); 2880 } else { 2881 method->SetMethodIndex(class_def_method_index); 2882 last_dex_method_index = it_method_index; 2883 last_class_def_method_index = class_def_method_index; 2884 } 2885 class_def_method_index++; 2886 } 2887 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2888 self->AllowThreadSuspension(); 2889 StackHandleScope<1> hs(self); 2890 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2891 if (UNLIKELY(method.Get() == nullptr)) { 2892 CHECK(self->IsExceptionPending()); // OOME. 2893 return; 2894 } 2895 klass->SetVirtualMethod(i, method.Get()); 2896 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2897 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2898 class_def_method_index++; 2899 } 2900 DCHECK(!it.HasNext()); 2901} 2902 2903void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2904 Handle<mirror::Class> klass, 2905 Handle<mirror::ArtField> dst) { 2906 uint32_t field_idx = it.GetMemberIndex(); 2907 dst->SetDexFieldIndex(field_idx); 2908 dst->SetDeclaringClass(klass.Get()); 2909 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2910} 2911 2912mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2913 const ClassDataItemIterator& it, 2914 Handle<mirror::Class> klass) { 2915 uint32_t dex_method_idx = it.GetMemberIndex(); 2916 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2917 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2918 2919 mirror::ArtMethod* dst = AllocArtMethod(self); 2920 if (UNLIKELY(dst == nullptr)) { 2921 CHECK(self->IsExceptionPending()); // OOME. 2922 return nullptr; 2923 } 2924 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2925 2926 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2927 dst->SetDexMethodIndex(dex_method_idx); 2928 dst->SetDeclaringClass(klass.Get()); 2929 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2930 2931 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2932 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2933 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2934 2935 uint32_t access_flags = it.GetMethodAccessFlags(); 2936 2937 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2938 // Set finalizable flag on declaring class. 2939 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2940 // Void return type. 2941 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2942 klass->SetFinalizable(); 2943 } else { 2944 std::string temp; 2945 const char* klass_descriptor = klass->GetDescriptor(&temp); 2946 // The Enum class declares a "final" finalize() method to prevent subclasses from 2947 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2948 // subclasses, so we exclude it here. 2949 // We also want to avoid setting the flag on Object, where we know that finalize() is 2950 // empty. 2951 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2952 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2953 klass->SetFinalizable(); 2954 } 2955 } 2956 } 2957 } else if (method_name[0] == '<') { 2958 // Fix broken access flags for initializers. Bug 11157540. 2959 bool is_init = (strcmp("<init>", method_name) == 0); 2960 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2961 if (UNLIKELY(!is_init && !is_clinit)) { 2962 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2963 } else { 2964 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2965 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2966 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2967 access_flags |= kAccConstructor; 2968 } 2969 } 2970 } 2971 dst->SetAccessFlags(access_flags); 2972 2973 return dst; 2974} 2975 2976void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2977 StackHandleScope<1> hs(self); 2978 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2979 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2980 << dex_file.GetLocation(); 2981 AppendToBootClassPath(dex_file, dex_cache); 2982} 2983 2984void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2985 Handle<mirror::DexCache> dex_cache) { 2986 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2987 boot_class_path_.push_back(&dex_file); 2988 RegisterDexFile(dex_file, dex_cache); 2989} 2990 2991bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2992 dex_lock_.AssertSharedHeld(Thread::Current()); 2993 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2994 mirror::DexCache* dex_cache = GetDexCache(i); 2995 if (dex_cache->GetDexFile() == &dex_file) { 2996 return true; 2997 } 2998 } 2999 return false; 3000} 3001 3002bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3003 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3004 return IsDexFileRegisteredLocked(dex_file); 3005} 3006 3007void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3008 Handle<mirror::DexCache> dex_cache) { 3009 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3010 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3011 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3012 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3013 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3014 dex_cache->SetDexFile(&dex_file); 3015 if (log_new_dex_caches_roots_) { 3016 // TODO: This is not safe if we can remove dex caches. 3017 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3018 } 3019} 3020 3021void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3022 Thread* self = Thread::Current(); 3023 { 3024 ReaderMutexLock mu(self, dex_lock_); 3025 if (IsDexFileRegisteredLocked(dex_file)) { 3026 return; 3027 } 3028 } 3029 // Don't alloc while holding the lock, since allocation may need to 3030 // suspend all threads and another thread may need the dex_lock_ to 3031 // get to a suspend point. 3032 StackHandleScope<1> hs(self); 3033 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3034 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3035 << dex_file.GetLocation(); 3036 { 3037 WriterMutexLock mu(self, dex_lock_); 3038 if (IsDexFileRegisteredLocked(dex_file)) { 3039 return; 3040 } 3041 RegisterDexFileLocked(dex_file, dex_cache); 3042 } 3043} 3044 3045void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3046 Handle<mirror::DexCache> dex_cache) { 3047 WriterMutexLock mu(Thread::Current(), dex_lock_); 3048 RegisterDexFileLocked(dex_file, dex_cache); 3049} 3050 3051mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3052 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3053 // Search assuming unique-ness of dex file. 3054 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3055 mirror::DexCache* dex_cache = GetDexCache(i); 3056 if (dex_cache->GetDexFile() == &dex_file) { 3057 return dex_cache; 3058 } 3059 } 3060 // Search matching by location name. 3061 std::string location(dex_file.GetLocation()); 3062 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3063 mirror::DexCache* dex_cache = GetDexCache(i); 3064 if (dex_cache->GetDexFile()->GetLocation() == location) { 3065 return dex_cache; 3066 } 3067 } 3068 // Failure, dump diagnostic and abort. 3069 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3070 mirror::DexCache* dex_cache = GetDexCache(i); 3071 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3072 } 3073 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3074 return nullptr; 3075} 3076 3077void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3078 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3079 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3080 mirror::DexCache* dex_cache = GetDexCache(i); 3081 dex_cache->Fixup(resolution_method); 3082 } 3083} 3084 3085mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3086 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3087 if (UNLIKELY(klass == nullptr)) { 3088 return nullptr; 3089 } 3090 return InitializePrimitiveClass(klass, type); 3091} 3092 3093mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3094 Primitive::Type type) { 3095 CHECK(primitive_class != nullptr); 3096 // Must hold lock on object when initializing. 3097 Thread* self = Thread::Current(); 3098 StackHandleScope<1> hs(self); 3099 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3100 ObjectLock<mirror::Class> lock(self, h_class); 3101 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3102 primitive_class->SetPrimitiveType(type); 3103 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3104 const char* descriptor = Primitive::Descriptor(type); 3105 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3106 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3107 return primitive_class; 3108} 3109 3110// Create an array class (i.e. the class object for the array, not the 3111// array itself). "descriptor" looks like "[C" or "[[[[B" or 3112// "[Ljava/lang/String;". 3113// 3114// If "descriptor" refers to an array of primitives, look up the 3115// primitive type's internally-generated class object. 3116// 3117// "class_loader" is the class loader of the class that's referring to 3118// us. It's used to ensure that we're looking for the element type in 3119// the right context. It does NOT become the class loader for the 3120// array class; that always comes from the base element class. 3121// 3122// Returns nullptr with an exception raised on failure. 3123mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3124 Handle<mirror::ClassLoader> class_loader) { 3125 // Identify the underlying component type 3126 CHECK_EQ('[', descriptor[0]); 3127 StackHandleScope<2> hs(self); 3128 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3129 class_loader))); 3130 if (component_type.Get() == nullptr) { 3131 DCHECK(self->IsExceptionPending()); 3132 // We need to accept erroneous classes as component types. 3133 component_type.Assign(LookupClass(self, descriptor + 1, class_loader.Get())); 3134 if (component_type.Get() == nullptr) { 3135 DCHECK(self->IsExceptionPending()); 3136 return nullptr; 3137 } else { 3138 self->ClearException(); 3139 } 3140 } 3141 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3142 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3143 return nullptr; 3144 } 3145 // See if the component type is already loaded. Array classes are 3146 // always associated with the class loader of their underlying 3147 // element type -- an array of Strings goes with the loader for 3148 // java/lang/String -- so we need to look for it there. (The 3149 // caller should have checked for the existence of the class 3150 // before calling here, but they did so with *their* class loader, 3151 // not the component type's loader.) 3152 // 3153 // If we find it, the caller adds "loader" to the class' initiating 3154 // loader list, which should prevent us from going through this again. 3155 // 3156 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3157 // are the same, because our caller (FindClass) just did the 3158 // lookup. (Even if we get this wrong we still have correct behavior, 3159 // because we effectively do this lookup again when we add the new 3160 // class to the hash table --- necessary because of possible races with 3161 // other threads.) 3162 if (class_loader.Get() != component_type->GetClassLoader()) { 3163 mirror::Class* new_class = LookupClass(self, descriptor, component_type->GetClassLoader()); 3164 if (new_class != nullptr) { 3165 return new_class; 3166 } 3167 } 3168 3169 // Fill out the fields in the Class. 3170 // 3171 // It is possible to execute some methods against arrays, because 3172 // all arrays are subclasses of java_lang_Object_, so we need to set 3173 // up a vtable. We can just point at the one in java_lang_Object_. 3174 // 3175 // Array classes are simple enough that we don't need to do a full 3176 // link step. 3177 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3178 if (UNLIKELY(!init_done_)) { 3179 // Classes that were hand created, ie not by FindSystemClass 3180 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3181 new_class.Assign(GetClassRoot(kClassArrayClass)); 3182 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3183 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3184 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3185 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3186 } else if (strcmp(descriptor, 3187 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3188 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3189 } else if (strcmp(descriptor, 3190 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3191 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3192 } else if (strcmp(descriptor, "[C") == 0) { 3193 new_class.Assign(GetClassRoot(kCharArrayClass)); 3194 } else if (strcmp(descriptor, "[I") == 0) { 3195 new_class.Assign(GetClassRoot(kIntArrayClass)); 3196 } 3197 } 3198 if (new_class.Get() == nullptr) { 3199 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3200 if (new_class.Get() == nullptr) { 3201 return nullptr; 3202 } 3203 new_class->SetComponentType(component_type.Get()); 3204 } 3205 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3206 DCHECK(new_class->GetComponentType() != nullptr); 3207 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3208 new_class->SetSuperClass(java_lang_Object); 3209 new_class->SetVTable(java_lang_Object->GetVTable()); 3210 new_class->SetPrimitiveType(Primitive::kPrimNot); 3211 new_class->SetClassLoader(component_type->GetClassLoader()); 3212 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3213 new_class->PopulateEmbeddedImtAndVTable(); 3214 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3215 // don't need to set new_class->SetObjectSize(..) 3216 // because Object::SizeOf delegates to Array::SizeOf 3217 3218 3219 // All arrays have java/lang/Cloneable and java/io/Serializable as 3220 // interfaces. We need to set that up here, so that stuff like 3221 // "instanceof" works right. 3222 // 3223 // Note: The GC could run during the call to FindSystemClass, 3224 // so we need to make sure the class object is GC-valid while we're in 3225 // there. Do this by clearing the interface list so the GC will just 3226 // think that the entries are null. 3227 3228 3229 // Use the single, global copies of "interfaces" and "iftable" 3230 // (remember not to free them for arrays). 3231 { 3232 mirror::IfTable* array_iftable = array_iftable_.Read(); 3233 CHECK(array_iftable != nullptr); 3234 new_class->SetIfTable(array_iftable); 3235 } 3236 3237 // Inherit access flags from the component type. 3238 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3239 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3240 access_flags &= kAccJavaFlagsMask; 3241 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3242 // and remove "interface". 3243 access_flags |= kAccAbstract | kAccFinal; 3244 access_flags &= ~kAccInterface; 3245 3246 new_class->SetAccessFlags(access_flags); 3247 3248 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3249 if (existing == nullptr) { 3250 return new_class.Get(); 3251 } 3252 // Another thread must have loaded the class after we 3253 // started but before we finished. Abandon what we've 3254 // done. 3255 // 3256 // (Yes, this happens.) 3257 3258 return existing; 3259} 3260 3261mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3262 switch (type) { 3263 case 'B': 3264 return GetClassRoot(kPrimitiveByte); 3265 case 'C': 3266 return GetClassRoot(kPrimitiveChar); 3267 case 'D': 3268 return GetClassRoot(kPrimitiveDouble); 3269 case 'F': 3270 return GetClassRoot(kPrimitiveFloat); 3271 case 'I': 3272 return GetClassRoot(kPrimitiveInt); 3273 case 'J': 3274 return GetClassRoot(kPrimitiveLong); 3275 case 'S': 3276 return GetClassRoot(kPrimitiveShort); 3277 case 'Z': 3278 return GetClassRoot(kPrimitiveBoolean); 3279 case 'V': 3280 return GetClassRoot(kPrimitiveVoid); 3281 default: 3282 break; 3283 } 3284 std::string printable_type(PrintableChar(type)); 3285 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3286 return nullptr; 3287} 3288 3289mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3290 size_t hash) { 3291 if (VLOG_IS_ON(class_linker)) { 3292 mirror::DexCache* dex_cache = klass->GetDexCache(); 3293 std::string source; 3294 if (dex_cache != nullptr) { 3295 source += " from "; 3296 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3297 } 3298 LOG(INFO) << "Loaded class " << descriptor << source; 3299 } 3300 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3301 mirror::Class* existing = 3302 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3303 if (existing != nullptr) { 3304 return existing; 3305 } 3306 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3307 dex_cache_image_class_lookup_required_) { 3308 // Check a class loaded with the system class loader matches one in the image if the class 3309 // is in the image. 3310 existing = LookupClassFromImage(descriptor); 3311 if (existing != nullptr) { 3312 CHECK(klass == existing); 3313 } 3314 } 3315 VerifyObject(klass); 3316 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3317 if (log_new_class_table_roots_) { 3318 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3319 } 3320 return nullptr; 3321} 3322 3323mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3324 size_t hash) { 3325 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3326 mirror::Class* existing = 3327 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3328 3329 if (existing == nullptr) { 3330 CHECK(klass->IsProxyClass()); 3331 return nullptr; 3332 } 3333 3334 CHECK_NE(existing, klass) << descriptor; 3335 CHECK(!existing->IsResolved()) << descriptor; 3336 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3337 3338 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3339 it != end && it->first == hash; ++it) { 3340 mirror::Class* klass = it->second.Read(); 3341 if (klass == existing) { 3342 class_table_.erase(it); 3343 break; 3344 } 3345 } 3346 3347 CHECK(!klass->IsTemp()) << descriptor; 3348 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3349 dex_cache_image_class_lookup_required_) { 3350 // Check a class loaded with the system class loader matches one in the image if the class 3351 // is in the image. 3352 existing = LookupClassFromImage(descriptor); 3353 if (existing != nullptr) { 3354 CHECK(klass == existing) << descriptor; 3355 } 3356 } 3357 VerifyObject(klass); 3358 3359 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3360 if (log_new_class_table_roots_) { 3361 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3362 } 3363 3364 return existing; 3365} 3366 3367bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3368 size_t hash = Hash(descriptor); 3369 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3370 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3371 it != end && it->first == hash; 3372 ++it) { 3373 mirror::Class* klass = it->second.Read(); 3374 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3375 class_table_.erase(it); 3376 return true; 3377 } 3378 } 3379 return false; 3380} 3381 3382mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, 3383 const mirror::ClassLoader* class_loader) { 3384 size_t hash = Hash(descriptor); 3385 { 3386 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3387 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3388 if (result != nullptr) { 3389 return result; 3390 } 3391 } 3392 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3393 return nullptr; 3394 } else { 3395 // Lookup failed but need to search dex_caches_. 3396 mirror::Class* result = LookupClassFromImage(descriptor); 3397 if (result != nullptr) { 3398 InsertClass(descriptor, result, hash); 3399 } else { 3400 // Searching the image dex files/caches failed, we don't want to get into this situation 3401 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3402 // classes into the class table. 3403 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3404 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3405 MoveImageClassesToClassTable(); 3406 } 3407 } 3408 return result; 3409 } 3410} 3411 3412mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3413 const mirror::ClassLoader* class_loader, 3414 size_t hash) { 3415 auto end = class_table_.end(); 3416 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3417 mirror::Class* klass = it->second.Read(); 3418 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3419 if (kIsDebugBuild) { 3420 // Check for duplicates in the table. 3421 for (++it; it != end && it->first == hash; ++it) { 3422 mirror::Class* klass2 = it->second.Read(); 3423 CHECK(!(klass2->GetClassLoader() == class_loader && 3424 klass2->DescriptorEquals(descriptor))) 3425 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3426 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3427 } 3428 } 3429 return klass; 3430 } 3431 } 3432 return nullptr; 3433} 3434 3435static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3436 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3437 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3438 CHECK(image != nullptr); 3439 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3440 return root->AsObjectArray<mirror::DexCache>(); 3441} 3442 3443void ClassLinker::MoveImageClassesToClassTable() { 3444 Thread* self = Thread::Current(); 3445 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3446 if (!dex_cache_image_class_lookup_required_) { 3447 return; // All dex cache classes are already in the class table. 3448 } 3449 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3450 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3451 std::string temp; 3452 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3453 mirror::DexCache* dex_cache = dex_caches->Get(i); 3454 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3455 for (int32_t j = 0; j < types->GetLength(); j++) { 3456 mirror::Class* klass = types->Get(j); 3457 if (klass != nullptr) { 3458 DCHECK(klass->GetClassLoader() == nullptr); 3459 const char* descriptor = klass->GetDescriptor(&temp); 3460 size_t hash = Hash(descriptor); 3461 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3462 if (existing != nullptr) { 3463 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3464 << PrettyClassAndClassLoader(klass); 3465 } else { 3466 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3467 if (log_new_class_table_roots_) { 3468 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3469 } 3470 } 3471 } 3472 } 3473 } 3474 dex_cache_image_class_lookup_required_ = false; 3475} 3476 3477mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3478 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3479 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3480 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3481 mirror::DexCache* dex_cache = dex_caches->Get(i); 3482 const DexFile* dex_file = dex_cache->GetDexFile(); 3483 // Try binary searching the string/type index. 3484 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3485 if (string_id != nullptr) { 3486 const DexFile::TypeId* type_id = 3487 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3488 if (type_id != nullptr) { 3489 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3490 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3491 if (klass != nullptr) { 3492 return klass; 3493 } 3494 } 3495 } 3496 } 3497 return nullptr; 3498} 3499 3500void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3501 result.clear(); 3502 if (dex_cache_image_class_lookup_required_) { 3503 MoveImageClassesToClassTable(); 3504 } 3505 size_t hash = Hash(descriptor); 3506 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3507 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3508 it != end && it->first == hash; ++it) { 3509 mirror::Class* klass = it->second.Read(); 3510 if (klass->DescriptorEquals(descriptor)) { 3511 result.push_back(klass); 3512 } 3513 } 3514} 3515 3516void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3517 // TODO: assert that the monitor on the Class is held 3518 ObjectLock<mirror::Class> lock(self, klass); 3519 3520 // Don't attempt to re-verify if already sufficiently verified. 3521 if (klass->IsVerified()) { 3522 EnsurePreverifiedMethods(klass); 3523 return; 3524 } 3525 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3526 return; 3527 } 3528 3529 // The class might already be erroneous, for example at compile time if we attempted to verify 3530 // this class as a parent to another. 3531 if (klass->IsErroneous()) { 3532 ThrowEarlierClassFailure(klass.Get()); 3533 return; 3534 } 3535 3536 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3537 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3538 } else { 3539 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3540 << PrettyClass(klass.Get()); 3541 CHECK(!Runtime::Current()->IsCompiler()); 3542 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3543 } 3544 3545 // Skip verification if disabled. 3546 if (!Runtime::Current()->IsVerificationEnabled()) { 3547 klass->SetStatus(mirror::Class::kStatusVerified, self); 3548 EnsurePreverifiedMethods(klass); 3549 return; 3550 } 3551 3552 // Verify super class. 3553 StackHandleScope<2> hs(self); 3554 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3555 if (super.Get() != nullptr) { 3556 // Acquire lock to prevent races on verifying the super class. 3557 ObjectLock<mirror::Class> lock(self, super); 3558 3559 if (!super->IsVerified() && !super->IsErroneous()) { 3560 VerifyClass(self, super); 3561 } 3562 if (!super->IsCompileTimeVerified()) { 3563 std::string error_msg( 3564 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3565 PrettyDescriptor(klass.Get()).c_str(), 3566 PrettyDescriptor(super.Get()).c_str())); 3567 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3568 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3569 if (cause.Get() != nullptr) { 3570 self->ClearException(); 3571 } 3572 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3573 if (cause.Get() != nullptr) { 3574 self->GetException(nullptr)->SetCause(cause.Get()); 3575 } 3576 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3577 if (Runtime::Current()->IsCompiler()) { 3578 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3579 } 3580 klass->SetStatus(mirror::Class::kStatusError, self); 3581 return; 3582 } 3583 } 3584 3585 // Try to use verification information from the oat file, otherwise do runtime verification. 3586 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3587 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3588 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3589 if (oat_file_class_status == mirror::Class::kStatusError) { 3590 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3591 << PrettyDescriptor(klass.Get()) << " in " 3592 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3593 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3594 PrettyDescriptor(klass.Get()).c_str()); 3595 klass->SetStatus(mirror::Class::kStatusError, self); 3596 return; 3597 } 3598 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3599 std::string error_msg; 3600 if (!preverified) { 3601 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3602 Runtime::Current()->IsCompiler(), 3603 &error_msg); 3604 } 3605 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3606 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3607 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3608 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3609 << " because: " << error_msg; 3610 } 3611 self->AssertNoPendingException(); 3612 // Make sure all classes referenced by catch blocks are resolved. 3613 ResolveClassExceptionHandlerTypes(dex_file, klass); 3614 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3615 // Even though there were no verifier failures we need to respect whether the super-class 3616 // was verified or requiring runtime reverification. 3617 if (super.Get() == nullptr || super->IsVerified()) { 3618 klass->SetStatus(mirror::Class::kStatusVerified, self); 3619 } else { 3620 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3621 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3622 // Pretend a soft failure occured so that we don't consider the class verified below. 3623 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3624 } 3625 } else { 3626 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3627 // Soft failures at compile time should be retried at runtime. Soft 3628 // failures at runtime will be handled by slow paths in the generated 3629 // code. Set status accordingly. 3630 if (Runtime::Current()->IsCompiler()) { 3631 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3632 } else { 3633 klass->SetStatus(mirror::Class::kStatusVerified, self); 3634 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3635 // later. 3636 klass->SetPreverified(); 3637 } 3638 } 3639 } else { 3640 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3641 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3642 << " because: " << error_msg; 3643 self->AssertNoPendingException(); 3644 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3645 klass->SetStatus(mirror::Class::kStatusError, self); 3646 } 3647 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3648 // Class is verified so we don't need to do any access check on its methods. 3649 // Let the interpreter know it by setting the kAccPreverified flag onto each 3650 // method. 3651 // Note: we're going here during compilation and at runtime. When we set the 3652 // kAccPreverified flag when compiling image classes, the flag is recorded 3653 // in the image and is set when loading the image. 3654 EnsurePreverifiedMethods(klass); 3655 } 3656} 3657 3658void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3659 if (!klass->IsPreverified()) { 3660 klass->SetPreverifiedFlagOnAllMethods(); 3661 klass->SetPreverified(); 3662 } 3663} 3664 3665bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3666 mirror::Class::Status& oat_file_class_status) { 3667 // If we're compiling, we can only verify the class using the oat file if 3668 // we are not compiling the image or if the class we're verifying is not part of 3669 // the app. In other words, we will only check for preverification of bootclasspath 3670 // classes. 3671 if (Runtime::Current()->IsCompiler()) { 3672 // Are we compiling the bootclasspath? 3673 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3674 return false; 3675 } 3676 // We are compiling an app (not the image). 3677 3678 // Is this an app class? (I.e. not a bootclasspath class) 3679 if (klass->GetClassLoader() != nullptr) { 3680 return false; 3681 } 3682 } 3683 3684 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3685 // In case we run without an image there won't be a backing oat file. 3686 if (oat_dex_file == nullptr) { 3687 return false; 3688 } 3689 3690 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3691 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3692 if (oat_file_class_status == mirror::Class::kStatusVerified || 3693 oat_file_class_status == mirror::Class::kStatusInitialized) { 3694 return true; 3695 } 3696 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3697 // Compile time verification failed with a soft error. Compile time verification can fail 3698 // because we have incomplete type information. Consider the following: 3699 // class ... { 3700 // Foo x; 3701 // .... () { 3702 // if (...) { 3703 // v1 gets assigned a type of resolved class Foo 3704 // } else { 3705 // v1 gets assigned a type of unresolved class Bar 3706 // } 3707 // iput x = v1 3708 // } } 3709 // when we merge v1 following the if-the-else it results in Conflict 3710 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3711 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3712 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3713 // at compile time). 3714 return false; 3715 } 3716 if (oat_file_class_status == mirror::Class::kStatusError) { 3717 // Compile time verification failed with a hard error. This is caused by invalid instructions 3718 // in the class. These errors are unrecoverable. 3719 return false; 3720 } 3721 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3722 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3723 // not loading the class. 3724 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3725 // isn't a problem and this case shouldn't occur 3726 return false; 3727 } 3728 std::string temp; 3729 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3730 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3731 << klass->GetDescriptor(&temp); 3732 3733 return false; 3734} 3735 3736void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3737 Handle<mirror::Class> klass) { 3738 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3739 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3740 } 3741 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3742 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3743 } 3744} 3745 3746void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3747 mirror::ArtMethod* method) { 3748 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3749 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3750 if (code_item == nullptr) { 3751 return; // native or abstract method 3752 } 3753 if (code_item->tries_size_ == 0) { 3754 return; // nothing to process 3755 } 3756 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3757 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3758 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3759 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3760 CatchHandlerIterator iterator(handlers_ptr); 3761 for (; iterator.HasNext(); iterator.Next()) { 3762 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3763 // unresolved exception types will be ignored by exception delivery 3764 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3765 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3766 if (exception_type == nullptr) { 3767 DCHECK(Thread::Current()->IsExceptionPending()); 3768 Thread::Current()->ClearException(); 3769 } 3770 } 3771 } 3772 handlers_ptr = iterator.EndDataPointer(); 3773 } 3774} 3775 3776static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3777static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3778 Handle<mirror::ArtMethod> prototype); 3779 3780mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3781 jobjectArray interfaces, jobject loader, 3782 jobjectArray methods, jobjectArray throws) { 3783 Thread* self = soa.Self(); 3784 StackHandleScope<8> hs(self); 3785 MutableHandle<mirror::Class> klass(hs.NewHandle( 3786 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3787 if (klass.Get() == nullptr) { 3788 CHECK(self->IsExceptionPending()); // OOME. 3789 return nullptr; 3790 } 3791 DCHECK(klass->GetClass() != nullptr); 3792 klass->SetObjectSize(sizeof(mirror::Proxy)); 3793 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3794 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3795 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3796 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3797 klass->SetName(soa.Decode<mirror::String*>(name)); 3798 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3799 klass->SetDexCache(proxy_class->GetDexCache()); 3800 klass->SetStatus(mirror::Class::kStatusIdx, self); 3801 3802 // Instance fields are inherited, but we add a couple of static fields... 3803 { 3804 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3805 if (UNLIKELY(sfields == nullptr)) { 3806 CHECK(self->IsExceptionPending()); // OOME. 3807 return nullptr; 3808 } 3809 klass->SetSFields(sfields); 3810 } 3811 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3812 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3813 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3814 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3815 CHECK(self->IsExceptionPending()); // OOME. 3816 return nullptr; 3817 } 3818 klass->SetStaticField(0, interfaces_sfield.Get()); 3819 interfaces_sfield->SetDexFieldIndex(0); 3820 interfaces_sfield->SetDeclaringClass(klass.Get()); 3821 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3822 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3823 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3824 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3825 CHECK(self->IsExceptionPending()); // OOME. 3826 return nullptr; 3827 } 3828 klass->SetStaticField(1, throws_sfield.Get()); 3829 throws_sfield->SetDexFieldIndex(1); 3830 throws_sfield->SetDeclaringClass(klass.Get()); 3831 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3832 3833 // Proxies have 1 direct method, the constructor 3834 { 3835 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3836 if (UNLIKELY(directs == nullptr)) { 3837 CHECK(self->IsExceptionPending()); // OOME. 3838 return nullptr; 3839 } 3840 klass->SetDirectMethods(directs); 3841 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3842 if (UNLIKELY(constructor == nullptr)) { 3843 CHECK(self->IsExceptionPending()); // OOME. 3844 return nullptr; 3845 } 3846 klass->SetDirectMethod(0, constructor); 3847 } 3848 3849 // Create virtual method using specified prototypes. 3850 size_t num_virtual_methods = 3851 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3852 { 3853 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3854 num_virtual_methods); 3855 if (UNLIKELY(virtuals == nullptr)) { 3856 CHECK(self->IsExceptionPending()); // OOME. 3857 return nullptr; 3858 } 3859 klass->SetVirtualMethods(virtuals); 3860 } 3861 for (size_t i = 0; i < num_virtual_methods; ++i) { 3862 StackHandleScope<1> hs(self); 3863 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3864 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3865 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3866 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3867 if (UNLIKELY(clone == nullptr)) { 3868 CHECK(self->IsExceptionPending()); // OOME. 3869 return nullptr; 3870 } 3871 klass->SetVirtualMethod(i, clone); 3872 } 3873 3874 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3875 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3876 self->AssertNoPendingException(); 3877 3878 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3879 mirror::Class* new_class = nullptr; 3880 { 3881 // Must hold lock on object when resolved. 3882 ObjectLock<mirror::Class> resolution_lock(self, klass); 3883 // Link the fields and virtual methods, creating vtable and iftables 3884 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3885 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3886 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3887 klass->SetStatus(mirror::Class::kStatusError, self); 3888 return nullptr; 3889 } 3890 } 3891 3892 CHECK(klass->IsRetired()); 3893 CHECK_NE(klass.Get(), new_class); 3894 klass.Assign(new_class); 3895 3896 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3897 interfaces_sfield->SetObject<false>(klass.Get(), 3898 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3899 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3900 throws_sfield->SetObject<false>(klass.Get(), 3901 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3902 3903 { 3904 // Lock on klass is released. Lock new class object. 3905 ObjectLock<mirror::Class> initialization_lock(self, klass); 3906 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3907 } 3908 3909 // sanity checks 3910 if (kIsDebugBuild) { 3911 CHECK(klass->GetIFields() == nullptr); 3912 CheckProxyConstructor(klass->GetDirectMethod(0)); 3913 for (size_t i = 0; i < num_virtual_methods; ++i) { 3914 StackHandleScope<2> hs(self); 3915 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3916 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3917 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3918 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3919 CheckProxyMethod(virtual_method, prototype); 3920 } 3921 3922 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3923 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3924 decoded_name->ToModifiedUtf8().c_str())); 3925 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3926 3927 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3928 decoded_name->ToModifiedUtf8().c_str())); 3929 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3930 3931 CHECK_EQ(klass.Get()->GetInterfaces(), 3932 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3933 CHECK_EQ(klass.Get()->GetThrows(), 3934 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3935 } 3936 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3937 CHECK(existing == nullptr); 3938 return klass.Get(); 3939} 3940 3941std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3942 DCHECK(proxy_class->IsProxyClass()); 3943 mirror::String* name = proxy_class->GetName(); 3944 DCHECK(name != nullptr); 3945 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3946} 3947 3948mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3949 mirror::ArtMethod* proxy_method) { 3950 DCHECK(proxy_class->IsProxyClass()); 3951 DCHECK(proxy_method->IsProxyMethod()); 3952 // Locate the dex cache of the original interface/Object 3953 mirror::DexCache* dex_cache = nullptr; 3954 { 3955 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3956 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3957 mirror::DexCache* a_dex_cache = GetDexCache(i); 3958 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3959 dex_cache = a_dex_cache; 3960 break; 3961 } 3962 } 3963 } 3964 CHECK(dex_cache != nullptr); 3965 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3966 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3967 CHECK(resolved_method != nullptr); 3968 return resolved_method; 3969} 3970 3971 3972mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3973 Handle<mirror::Class> klass, 3974 mirror::Class* proxy_class) { 3975 // Create constructor for Proxy that must initialize h 3976 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3977 proxy_class->GetDirectMethods(); 3978 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3979 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3980 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3981 // constructor method. 3982 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3983 proxy_constructor); 3984 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3985 // code_ too) 3986 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3987 if (constructor == nullptr) { 3988 CHECK(self->IsExceptionPending()); // OOME. 3989 return nullptr; 3990 } 3991 // Make this constructor public and fix the class to be our Proxy version 3992 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3993 constructor->SetDeclaringClass(klass.Get()); 3994 return constructor; 3995} 3996 3997static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3998 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3999 CHECK(constructor->IsConstructor()); 4000 CHECK_STREQ(constructor->GetName(), "<init>"); 4001 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4002 "(Ljava/lang/reflect/InvocationHandler;)V"); 4003 DCHECK(constructor->IsPublic()); 4004} 4005 4006mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4007 Handle<mirror::Class> klass, 4008 Handle<mirror::ArtMethod> prototype) { 4009 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4010 // prototype method 4011 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4012 prototype.Get()); 4013 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4014 // as necessary 4015 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4016 if (UNLIKELY(method == nullptr)) { 4017 CHECK(self->IsExceptionPending()); // OOME. 4018 return nullptr; 4019 } 4020 4021 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4022 // the intersection of throw exceptions as defined in Proxy 4023 method->SetDeclaringClass(klass.Get()); 4024 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4025 4026 // At runtime the method looks like a reference and argument saving method, clone the code 4027 // related parameters from this method. 4028 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4029 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4030 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4031 4032 return method; 4033} 4034 4035static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4036 Handle<mirror::ArtMethod> prototype) 4037 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4038 // Basic sanity 4039 CHECK(!prototype->IsFinal()); 4040 CHECK(method->IsFinal()); 4041 CHECK(!method->IsAbstract()); 4042 4043 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4044 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4045 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4046 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4047 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4048 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4049 4050 StackHandleScope<2> hs(Thread::Current()); 4051 MethodHelper mh(hs.NewHandle(method.Get())); 4052 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4053 CHECK_STREQ(method->GetName(), prototype->GetName()); 4054 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4055 // More complex sanity - via dex cache 4056 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4057} 4058 4059static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4060 bool can_init_parents) 4061 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4062 if (can_init_statics && can_init_parents) { 4063 return true; 4064 } 4065 if (!can_init_statics) { 4066 // Check if there's a class initializer. 4067 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4068 if (clinit != nullptr) { 4069 return false; 4070 } 4071 // Check if there are encoded static values needing initialization. 4072 if (klass->NumStaticFields() != 0) { 4073 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4074 DCHECK(dex_class_def != nullptr); 4075 if (dex_class_def->static_values_off_ != 0) { 4076 return false; 4077 } 4078 } 4079 } 4080 if (!klass->IsInterface() && klass->HasSuperClass()) { 4081 mirror::Class* super_class = klass->GetSuperClass(); 4082 if (!can_init_parents && !super_class->IsInitialized()) { 4083 return false; 4084 } else { 4085 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4086 return false; 4087 } 4088 } 4089 } 4090 return true; 4091} 4092 4093bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4094 bool can_init_statics, bool can_init_parents) { 4095 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4096 4097 // Are we already initialized and therefore done? 4098 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4099 // an initialized class will never change its state. 4100 if (klass->IsInitialized()) { 4101 return true; 4102 } 4103 4104 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4105 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4106 return false; 4107 } 4108 4109 self->AllowThreadSuspension(); 4110 uint64_t t0; 4111 { 4112 ObjectLock<mirror::Class> lock(self, klass); 4113 4114 // Re-check under the lock in case another thread initialized ahead of us. 4115 if (klass->IsInitialized()) { 4116 return true; 4117 } 4118 4119 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4120 if (klass->IsErroneous()) { 4121 ThrowEarlierClassFailure(klass.Get()); 4122 VlogClassInitializationFailure(klass); 4123 return false; 4124 } 4125 4126 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4127 4128 if (!klass->IsVerified()) { 4129 VerifyClass(self, klass); 4130 if (!klass->IsVerified()) { 4131 // We failed to verify, expect either the klass to be erroneous or verification failed at 4132 // compile time. 4133 if (klass->IsErroneous()) { 4134 CHECK(self->IsExceptionPending()); 4135 VlogClassInitializationFailure(klass); 4136 } else { 4137 CHECK(Runtime::Current()->IsCompiler()); 4138 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4139 } 4140 return false; 4141 } else { 4142 self->AssertNoPendingException(); 4143 } 4144 } 4145 4146 // If the class is kStatusInitializing, either this thread is 4147 // initializing higher up the stack or another thread has beat us 4148 // to initializing and we need to wait. Either way, this 4149 // invocation of InitializeClass will not be responsible for 4150 // running <clinit> and will return. 4151 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4152 // Could have got an exception during verification. 4153 if (self->IsExceptionPending()) { 4154 VlogClassInitializationFailure(klass); 4155 return false; 4156 } 4157 // We caught somebody else in the act; was it us? 4158 if (klass->GetClinitThreadId() == self->GetTid()) { 4159 // Yes. That's fine. Return so we can continue initializing. 4160 return true; 4161 } 4162 // No. That's fine. Wait for another thread to finish initializing. 4163 return WaitForInitializeClass(klass, self, lock); 4164 } 4165 4166 if (!ValidateSuperClassDescriptors(klass)) { 4167 klass->SetStatus(mirror::Class::kStatusError, self); 4168 return false; 4169 } 4170 self->AllowThreadSuspension(); 4171 4172 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4173 4174 // From here out other threads may observe that we're initializing and so changes of state 4175 // require the a notification. 4176 klass->SetClinitThreadId(self->GetTid()); 4177 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4178 4179 t0 = NanoTime(); 4180 } 4181 4182 // Initialize super classes, must be done while initializing for the JLS. 4183 if (!klass->IsInterface() && klass->HasSuperClass()) { 4184 mirror::Class* super_class = klass->GetSuperClass(); 4185 if (!super_class->IsInitialized()) { 4186 CHECK(!super_class->IsInterface()); 4187 CHECK(can_init_parents); 4188 StackHandleScope<1> hs(self); 4189 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4190 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4191 if (!super_initialized) { 4192 // The super class was verified ahead of entering initializing, we should only be here if 4193 // the super class became erroneous due to initialization. 4194 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4195 << "Super class initialization failed for " 4196 << PrettyDescriptor(handle_scope_super.Get()) 4197 << " that has unexpected status " << handle_scope_super->GetStatus() 4198 << "\nPending exception:\n" 4199 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4200 ObjectLock<mirror::Class> lock(self, klass); 4201 // Initialization failed because the super-class is erroneous. 4202 klass->SetStatus(mirror::Class::kStatusError, self); 4203 return false; 4204 } 4205 } 4206 } 4207 4208 if (klass->NumStaticFields() > 0) { 4209 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4210 CHECK(dex_class_def != nullptr); 4211 const DexFile& dex_file = klass->GetDexFile(); 4212 StackHandleScope<3> hs(self); 4213 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4214 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4215 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4216 this, *dex_class_def); 4217 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4218 ClassDataItemIterator field_it(dex_file, class_data); 4219 if (value_it.HasNext()) { 4220 DCHECK(field_it.HasNextStaticField()); 4221 CHECK(can_init_statics); 4222 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4223 StackHandleScope<1> hs(self); 4224 Handle<mirror::ArtField> field(hs.NewHandle( 4225 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4226 if (Runtime::Current()->IsActiveTransaction()) { 4227 value_it.ReadValueToField<true>(field); 4228 } else { 4229 value_it.ReadValueToField<false>(field); 4230 } 4231 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4232 } 4233 } 4234 } 4235 4236 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4237 if (clinit != nullptr) { 4238 CHECK(can_init_statics); 4239 JValue result; 4240 clinit->Invoke(self, nullptr, 0, &result, "V"); 4241 } 4242 4243 self->AllowThreadSuspension(); 4244 uint64_t t1 = NanoTime(); 4245 4246 bool success = true; 4247 { 4248 ObjectLock<mirror::Class> lock(self, klass); 4249 4250 if (self->IsExceptionPending()) { 4251 WrapExceptionInInitializer(klass); 4252 klass->SetStatus(mirror::Class::kStatusError, self); 4253 success = false; 4254 } else { 4255 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4256 RuntimeStats* thread_stats = self->GetStats(); 4257 ++global_stats->class_init_count; 4258 ++thread_stats->class_init_count; 4259 global_stats->class_init_time_ns += (t1 - t0); 4260 thread_stats->class_init_time_ns += (t1 - t0); 4261 // Set the class as initialized except if failed to initialize static fields. 4262 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4263 if (VLOG_IS_ON(class_linker)) { 4264 std::string temp; 4265 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4266 klass->GetLocation(); 4267 } 4268 // Opportunistically set static method trampolines to their destination. 4269 FixupStaticTrampolines(klass.Get()); 4270 } 4271 } 4272 return success; 4273} 4274 4275bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4276 ObjectLock<mirror::Class>& lock) 4277 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4278 while (true) { 4279 self->AssertNoPendingException(); 4280 CHECK(!klass->IsInitialized()); 4281 lock.WaitIgnoringInterrupts(); 4282 4283 // When we wake up, repeat the test for init-in-progress. If 4284 // there's an exception pending (only possible if 4285 // we were not using WaitIgnoringInterrupts), bail out. 4286 if (self->IsExceptionPending()) { 4287 WrapExceptionInInitializer(klass); 4288 klass->SetStatus(mirror::Class::kStatusError, self); 4289 return false; 4290 } 4291 // Spurious wakeup? Go back to waiting. 4292 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4293 continue; 4294 } 4295 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4296 // Compile time initialization failed. 4297 return false; 4298 } 4299 if (klass->IsErroneous()) { 4300 // The caller wants an exception, but it was thrown in a 4301 // different thread. Synthesize one here. 4302 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4303 PrettyDescriptor(klass.Get()).c_str()); 4304 VlogClassInitializationFailure(klass); 4305 return false; 4306 } 4307 if (klass->IsInitialized()) { 4308 return true; 4309 } 4310 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4311 << klass->GetStatus(); 4312 } 4313 UNREACHABLE(); 4314} 4315 4316bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4317 if (klass->IsInterface()) { 4318 return true; 4319 } 4320 // Begin with the methods local to the superclass. 4321 StackHandleScope<2> hs(Thread::Current()); 4322 MutableMethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4323 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4324 if (klass->HasSuperClass() && 4325 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4326 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4327 mh.ChangeMethod(klass->GetVTableEntry(i)); 4328 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4329 if (mh.GetMethod() != super_mh.GetMethod() && 4330 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4331 ThrowLinkageError(klass.Get(), 4332 "Class %s method %s resolves differently in superclass %s", 4333 PrettyDescriptor(klass.Get()).c_str(), 4334 PrettyMethod(mh.GetMethod()).c_str(), 4335 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4336 return false; 4337 } 4338 } 4339 } 4340 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4341 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4342 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4343 for (uint32_t j = 0; j < num_methods; ++j) { 4344 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4345 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4346 if (mh.GetMethod() != super_mh.GetMethod() && 4347 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4348 ThrowLinkageError(klass.Get(), 4349 "Class %s method %s resolves differently in interface %s", 4350 PrettyDescriptor(klass.Get()).c_str(), 4351 PrettyMethod(mh.GetMethod()).c_str(), 4352 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4353 return false; 4354 } 4355 } 4356 } 4357 } 4358 return true; 4359} 4360 4361bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4362 bool can_init_parents) { 4363 DCHECK(c.Get() != nullptr); 4364 if (c->IsInitialized()) { 4365 EnsurePreverifiedMethods(c); 4366 return true; 4367 } 4368 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4369 if (!success) { 4370 if (can_init_fields && can_init_parents) { 4371 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4372 } 4373 } else { 4374 self->AssertNoPendingException(); 4375 } 4376 return success; 4377} 4378 4379void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4380 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4381 if (fields != nullptr) { 4382 for (int index = 0; index < fields->GetLength(); index ++) { 4383 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4384 fields->Get(index)->SetDeclaringClass(new_class); 4385 } 4386 } 4387 } 4388 4389 fields = new_class->GetSFields(); 4390 if (fields != nullptr) { 4391 for (int index = 0; index < fields->GetLength(); index ++) { 4392 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4393 fields->Get(index)->SetDeclaringClass(new_class); 4394 } 4395 } 4396 } 4397 4398 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4399 if (methods != nullptr) { 4400 for (int index = 0; index < methods->GetLength(); index ++) { 4401 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4402 methods->Get(index)->SetDeclaringClass(new_class); 4403 } 4404 } 4405 } 4406 4407 methods = new_class->GetVirtualMethods(); 4408 if (methods != nullptr) { 4409 for (int index = 0; index < methods->GetLength(); index ++) { 4410 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4411 methods->Get(index)->SetDeclaringClass(new_class); 4412 } 4413 } 4414 } 4415} 4416 4417bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4418 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4419 mirror::Class** new_class) { 4420 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4421 4422 if (!LinkSuperClass(klass)) { 4423 return false; 4424 } 4425 if (!LinkMethods(self, klass, interfaces)) { 4426 return false; 4427 } 4428 if (!LinkInstanceFields(self, klass)) { 4429 return false; 4430 } 4431 size_t class_size; 4432 if (!LinkStaticFields(self, klass, &class_size)) { 4433 return false; 4434 } 4435 CreateReferenceInstanceOffsets(klass); 4436 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4437 4438 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4439 // We don't need to retire this class as it has no embedded tables or it was created the 4440 // correct size during class linker initialization. 4441 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4442 4443 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4444 klass->PopulateEmbeddedImtAndVTable(); 4445 } 4446 4447 // This will notify waiters on klass that saw the not yet resolved 4448 // class in the class_table_ during EnsureResolved. 4449 klass->SetStatus(mirror::Class::kStatusResolved, self); 4450 *new_class = klass.Get(); 4451 } else { 4452 CHECK(!klass->IsResolved()); 4453 // Retire the temporary class and create the correctly sized resolved class. 4454 *new_class = klass->CopyOf(self, class_size); 4455 if (UNLIKELY(*new_class == nullptr)) { 4456 CHECK(self->IsExceptionPending()); // Expect an OOME. 4457 klass->SetStatus(mirror::Class::kStatusError, self); 4458 return false; 4459 } 4460 4461 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4462 StackHandleScope<1> hs(self); 4463 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4464 ObjectLock<mirror::Class> lock(self, new_class_h); 4465 4466 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4467 4468 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4469 CHECK(existing == nullptr || existing == klass.Get()); 4470 4471 // This will notify waiters on temp class that saw the not yet resolved class in the 4472 // class_table_ during EnsureResolved. 4473 klass->SetStatus(mirror::Class::kStatusRetired, self); 4474 4475 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4476 // This will notify waiters on new_class that saw the not yet resolved 4477 // class in the class_table_ during EnsureResolved. 4478 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4479 } 4480 return true; 4481} 4482 4483bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4484 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4485 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4486 uint16_t super_class_idx = class_def.superclass_idx_; 4487 if (super_class_idx != DexFile::kDexNoIndex16) { 4488 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4489 if (super_class == nullptr) { 4490 DCHECK(Thread::Current()->IsExceptionPending()); 4491 return false; 4492 } 4493 // Verify 4494 if (!klass->CanAccess(super_class)) { 4495 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4496 PrettyDescriptor(super_class).c_str(), 4497 PrettyDescriptor(klass.Get()).c_str()); 4498 return false; 4499 } 4500 CHECK(super_class->IsResolved()); 4501 klass->SetSuperClass(super_class); 4502 } 4503 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4504 if (interfaces != nullptr) { 4505 for (size_t i = 0; i < interfaces->Size(); i++) { 4506 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4507 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4508 if (interface == nullptr) { 4509 DCHECK(Thread::Current()->IsExceptionPending()); 4510 return false; 4511 } 4512 // Verify 4513 if (!klass->CanAccess(interface)) { 4514 // TODO: the RI seemed to ignore this in my testing. 4515 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4516 PrettyDescriptor(interface).c_str(), 4517 PrettyDescriptor(klass.Get()).c_str()); 4518 return false; 4519 } 4520 } 4521 } 4522 // Mark the class as loaded. 4523 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4524 return true; 4525} 4526 4527bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4528 CHECK(!klass->IsPrimitive()); 4529 mirror::Class* super = klass->GetSuperClass(); 4530 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4531 if (super != nullptr) { 4532 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4533 return false; 4534 } 4535 return true; 4536 } 4537 if (super == nullptr) { 4538 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4539 PrettyDescriptor(klass.Get()).c_str()); 4540 return false; 4541 } 4542 // Verify 4543 if (super->IsFinal() || super->IsInterface()) { 4544 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4545 PrettyDescriptor(super).c_str(), 4546 PrettyDescriptor(klass.Get()).c_str(), 4547 super->IsFinal() ? "declared final" : "an interface"); 4548 return false; 4549 } 4550 if (!klass->CanAccess(super)) { 4551 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4552 PrettyDescriptor(super).c_str(), 4553 PrettyDescriptor(klass.Get()).c_str()); 4554 return false; 4555 } 4556 4557 // Inherit kAccClassIsFinalizable from the superclass in case this 4558 // class doesn't override finalize. 4559 if (super->IsFinalizable()) { 4560 klass->SetFinalizable(); 4561 } 4562 4563 // Inherit reference flags (if any) from the superclass. 4564 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4565 if (reference_flags != 0) { 4566 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4567 } 4568 // Disallow custom direct subclasses of java.lang.ref.Reference. 4569 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4570 ThrowLinkageError(klass.Get(), 4571 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4572 PrettyDescriptor(klass.Get()).c_str()); 4573 return false; 4574 } 4575 4576 if (kIsDebugBuild) { 4577 // Ensure super classes are fully resolved prior to resolving fields.. 4578 while (super != nullptr) { 4579 CHECK(super->IsResolved()); 4580 super = super->GetSuperClass(); 4581 } 4582 } 4583 return true; 4584} 4585 4586// Populate the class vtable and itable. Compute return type indices. 4587bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4588 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4589 self->AllowThreadSuspension(); 4590 if (klass->IsInterface()) { 4591 // No vtable. 4592 size_t count = klass->NumVirtualMethods(); 4593 if (!IsUint(16, count)) { 4594 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4595 return false; 4596 } 4597 for (size_t i = 0; i < count; ++i) { 4598 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4599 } 4600 // Link interface method tables 4601 return LinkInterfaceMethods(klass, interfaces); 4602 } else { 4603 // Link virtual and interface method tables 4604 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4605 } 4606 return true; 4607} 4608 4609bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4610 if (klass->HasSuperClass()) { 4611 uint32_t max_count = klass->NumVirtualMethods() + 4612 klass->GetSuperClass()->GetVTableLength(); 4613 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4614 CHECK_LE(actual_count, max_count); 4615 StackHandleScope<4> hs(self); 4616 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4617 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4618 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4619 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4620 if (UNLIKELY(vtable.Get() == nullptr)) { 4621 CHECK(self->IsExceptionPending()); // OOME. 4622 return false; 4623 } 4624 int len = super_class->GetVTableLength(); 4625 for (int i = 0; i < len; i++) { 4626 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4627 } 4628 } else { 4629 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4630 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4631 if (UNLIKELY(vtable.Get() == nullptr)) { 4632 CHECK(self->IsExceptionPending()); // OOME. 4633 return false; 4634 } 4635 } 4636 4637 // See if any of our virtual methods override the superclass. 4638 MutableMethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4639 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4640 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4641 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4642 local_mh.ChangeMethod(local_method); 4643 size_t j = 0; 4644 for (; j < actual_count; ++j) { 4645 mirror::ArtMethod* super_method = vtable->Get(j); 4646 super_mh.ChangeMethod(super_method); 4647 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4648 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4649 super_method->GetAccessFlags())) { 4650 if (super_method->IsFinal()) { 4651 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4652 PrettyMethod(local_method).c_str(), 4653 super_method->GetDeclaringClassDescriptor()); 4654 return false; 4655 } 4656 vtable->Set<false>(j, local_method); 4657 local_method->SetMethodIndex(j); 4658 break; 4659 } else { 4660 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4661 << " would have incorrectly overridden the package-private method in " 4662 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4663 } 4664 } 4665 } 4666 if (j == actual_count) { 4667 // Not overriding, append. 4668 vtable->Set<false>(actual_count, local_method); 4669 local_method->SetMethodIndex(actual_count); 4670 actual_count += 1; 4671 } 4672 } 4673 if (!IsUint(16, actual_count)) { 4674 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4675 return false; 4676 } 4677 // Shrink vtable if possible 4678 CHECK_LE(actual_count, max_count); 4679 if (actual_count < max_count) { 4680 vtable.Assign(vtable->CopyOf(self, actual_count)); 4681 if (UNLIKELY(vtable.Get() == nullptr)) { 4682 CHECK(self->IsExceptionPending()); // OOME. 4683 return false; 4684 } 4685 } 4686 klass->SetVTable(vtable.Get()); 4687 } else { 4688 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4689 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4690 if (!IsUint(16, num_virtual_methods)) { 4691 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4692 return false; 4693 } 4694 StackHandleScope<1> hs(self); 4695 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4696 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4697 if (UNLIKELY(vtable.Get() == nullptr)) { 4698 CHECK(self->IsExceptionPending()); // OOME. 4699 return false; 4700 } 4701 for (size_t i = 0; i < num_virtual_methods; ++i) { 4702 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4703 vtable->Set<false>(i, virtual_method); 4704 virtual_method->SetMethodIndex(i & 0xFFFF); 4705 } 4706 klass->SetVTable(vtable.Get()); 4707 } 4708 return true; 4709} 4710 4711bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4712 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4713 Thread* const self = Thread::Current(); 4714 Runtime* const runtime = Runtime::Current(); 4715 // Set the imt table to be all conflicts by default. 4716 klass->SetImTable(runtime->GetDefaultImt()); 4717 size_t super_ifcount; 4718 if (klass->HasSuperClass()) { 4719 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4720 } else { 4721 super_ifcount = 0; 4722 } 4723 uint32_t num_interfaces = 4724 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4725 size_t ifcount = super_ifcount + num_interfaces; 4726 for (size_t i = 0; i < num_interfaces; i++) { 4727 mirror::Class* interface = 4728 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4729 interfaces->Get(i); 4730 ifcount += interface->GetIfTableCount(); 4731 } 4732 if (ifcount == 0) { 4733 // Class implements no interfaces. 4734 DCHECK_EQ(klass->GetIfTableCount(), 0); 4735 DCHECK(klass->GetIfTable() == nullptr); 4736 return true; 4737 } 4738 if (ifcount == super_ifcount) { 4739 // Class implements same interfaces as parent, are any of these not marker interfaces? 4740 bool has_non_marker_interface = false; 4741 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4742 for (size_t i = 0; i < ifcount; ++i) { 4743 if (super_iftable->GetMethodArrayCount(i) > 0) { 4744 has_non_marker_interface = true; 4745 break; 4746 } 4747 } 4748 if (!has_non_marker_interface) { 4749 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4750 klass->SetIfTable(super_iftable); 4751 return true; 4752 } 4753 } 4754 StackHandleScope<5> hs(self); 4755 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4756 if (UNLIKELY(iftable.Get() == nullptr)) { 4757 CHECK(self->IsExceptionPending()); // OOME. 4758 return false; 4759 } 4760 if (super_ifcount != 0) { 4761 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4762 for (size_t i = 0; i < super_ifcount; i++) { 4763 mirror::Class* super_interface = super_iftable->GetInterface(i); 4764 iftable->SetInterface(i, super_interface); 4765 } 4766 } 4767 self->AllowThreadSuspension(); 4768 // Flatten the interface inheritance hierarchy. 4769 size_t idx = super_ifcount; 4770 for (size_t i = 0; i < num_interfaces; i++) { 4771 mirror::Class* interface = 4772 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4773 interfaces->Get(i); 4774 DCHECK(interface != nullptr); 4775 if (!interface->IsInterface()) { 4776 std::string temp; 4777 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4778 PrettyDescriptor(klass.Get()).c_str(), 4779 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4780 return false; 4781 } 4782 // Check if interface is already in iftable 4783 bool duplicate = false; 4784 for (size_t j = 0; j < idx; j++) { 4785 mirror::Class* existing_interface = iftable->GetInterface(j); 4786 if (existing_interface == interface) { 4787 duplicate = true; 4788 break; 4789 } 4790 } 4791 if (!duplicate) { 4792 // Add this non-duplicate interface. 4793 iftable->SetInterface(idx++, interface); 4794 // Add this interface's non-duplicate super-interfaces. 4795 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4796 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4797 bool super_duplicate = false; 4798 for (size_t k = 0; k < idx; k++) { 4799 mirror::Class* existing_interface = iftable->GetInterface(k); 4800 if (existing_interface == super_interface) { 4801 super_duplicate = true; 4802 break; 4803 } 4804 } 4805 if (!super_duplicate) { 4806 iftable->SetInterface(idx++, super_interface); 4807 } 4808 } 4809 } 4810 } 4811 self->AllowThreadSuspension(); 4812 // Shrink iftable in case duplicates were found 4813 if (idx < ifcount) { 4814 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4815 if (UNLIKELY(iftable.Get() == nullptr)) { 4816 CHECK(self->IsExceptionPending()); // OOME. 4817 return false; 4818 } 4819 ifcount = idx; 4820 } else { 4821 CHECK_EQ(idx, ifcount); 4822 } 4823 klass->SetIfTable(iftable.Get()); 4824 4825 // If we're an interface, we don't need the vtable pointers, so we're done. 4826 if (klass->IsInterface()) { 4827 return true; 4828 } 4829 self->AllowThreadSuspension(); 4830 // Allocate imtable 4831 bool imtable_changed = false; 4832 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4833 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4834 if (UNLIKELY(imtable.Get() == nullptr)) { 4835 CHECK(self->IsExceptionPending()); // OOME. 4836 return false; 4837 } 4838 MutableMethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4839 MutableMethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4840 size_t max_miranda_methods = 0; // The max size of miranda_list. 4841 for (size_t i = 0; i < ifcount; ++i) { 4842 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4843 } 4844 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4845 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4846 size_t miranda_list_size = 0; // The current size of miranda_list. 4847 for (size_t i = 0; i < ifcount; ++i) { 4848 self->AllowThreadSuspension(); 4849 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4850 if (num_methods > 0) { 4851 StackHandleScope<2> hs(self); 4852 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4853 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4854 if (UNLIKELY(method_array.Get() == nullptr)) { 4855 CHECK(self->IsExceptionPending()); // OOME. 4856 return false; 4857 } 4858 iftable->SetMethodArray(i, method_array.Get()); 4859 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4860 hs.NewHandle(klass->GetVTableDuringLinking())); 4861 for (size_t j = 0; j < num_methods; ++j) { 4862 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4863 int32_t k; 4864 // For each method listed in the interface's method list, find the 4865 // matching method in our class's method list. We want to favor the 4866 // subclass over the superclass, which just requires walking 4867 // back from the end of the vtable. (This only matters if the 4868 // superclass defines a private method and this class redefines 4869 // it -- otherwise it would use the same vtable slot. In .dex files 4870 // those don't end up in the virtual method table, so it shouldn't 4871 // matter which direction we go. We walk it backward anyway.) 4872 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4873 vtable_mh.ChangeMethod(vtable->Get(k)); 4874 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4875 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4876 ThrowIllegalAccessError( 4877 klass.Get(), 4878 "Method '%s' implementing interface method '%s' is not public", 4879 PrettyMethod(vtable_mh.Get()).c_str(), 4880 PrettyMethod(interface_mh.Get()).c_str()); 4881 return false; 4882 } 4883 method_array->Set<false>(j, vtable_mh.Get()); 4884 // Place method in imt if entry is empty, place conflict otherwise. 4885 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4886 if (imtable->Get(imt_index) == nullptr) { 4887 imtable->Set<false>(imt_index, vtable_mh.Get()); 4888 imtable_changed = true; 4889 } else { 4890 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4891 } 4892 break; 4893 } 4894 } 4895 if (k < 0) { 4896 StackHandleScope<1> hs(self); 4897 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4898 for (size_t l = 0; l < miranda_list_size; ++l) { 4899 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4900 DCHECK(mir_method != nullptr); 4901 vtable_mh.ChangeMethod(mir_method); 4902 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4903 miranda_method.Assign(mir_method); 4904 break; 4905 } 4906 } 4907 if (miranda_method.Get() == nullptr) { 4908 // Point the interface table at a phantom slot. 4909 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4910 if (UNLIKELY(miranda_method.Get() == nullptr)) { 4911 CHECK(self->IsExceptionPending()); // OOME. 4912 return false; 4913 } 4914 DCHECK_LT(miranda_list_size, max_miranda_methods); 4915 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4916 } 4917 method_array->Set<false>(j, miranda_method.Get()); 4918 } 4919 } 4920 } 4921 } 4922 if (imtable_changed) { 4923 // Fill in empty entries in interface method table with conflict. 4924 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4925 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4926 if (imtable->Get(i) == nullptr) { 4927 imtable->Set<false>(i, imt_conflict_method); 4928 } 4929 } 4930 klass->SetImTable(imtable.Get()); 4931 } 4932 if (miranda_list_size > 0) { 4933 int old_method_count = klass->NumVirtualMethods(); 4934 int new_method_count = old_method_count + miranda_list_size; 4935 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4936 if (old_method_count == 0) { 4937 virtuals = AllocArtMethodArray(self, new_method_count); 4938 } else { 4939 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4940 } 4941 if (UNLIKELY(virtuals == nullptr)) { 4942 CHECK(self->IsExceptionPending()); // OOME. 4943 return false; 4944 } 4945 klass->SetVirtualMethods(virtuals); 4946 4947 StackHandleScope<1> hs(self); 4948 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4949 hs.NewHandle(klass->GetVTableDuringLinking())); 4950 CHECK(vtable.Get() != nullptr); 4951 int old_vtable_count = vtable->GetLength(); 4952 int new_vtable_count = old_vtable_count + miranda_list_size; 4953 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4954 if (UNLIKELY(vtable.Get() == nullptr)) { 4955 CHECK(self->IsExceptionPending()); // OOME. 4956 return false; 4957 } 4958 for (size_t i = 0; i < miranda_list_size; ++i) { 4959 mirror::ArtMethod* method = miranda_list->Get(i); 4960 // Leave the declaring class alone as type indices are relative to it 4961 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4962 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4963 klass->SetVirtualMethod(old_method_count + i, method); 4964 vtable->Set<false>(old_vtable_count + i, method); 4965 } 4966 // TODO: do not assign to the vtable field until it is fully constructed. 4967 klass->SetVTable(vtable.Get()); 4968 } 4969 4970 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4971 for (int i = 0; i < vtable->GetLength(); ++i) { 4972 CHECK(vtable->Get(i) != nullptr); 4973 } 4974 4975 self->AllowThreadSuspension(); 4976 4977 return true; 4978} 4979 4980bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 4981 CHECK(klass.Get() != nullptr); 4982 return LinkFields(self, klass, false, nullptr); 4983} 4984 4985bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 4986 CHECK(klass.Get() != nullptr); 4987 return LinkFields(self, klass, true, class_size); 4988} 4989 4990struct LinkFieldsComparator { 4991 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4992 } 4993 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4994 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4995 NO_THREAD_SAFETY_ANALYSIS { 4996 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 4997 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4998 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4999 if (type1 != type2) { 5000 bool is_primitive1 = type1 != Primitive::kPrimNot; 5001 bool is_primitive2 = type2 != Primitive::kPrimNot; 5002 if (type1 != type2) { 5003 if (is_primitive1 && is_primitive2) { 5004 // Larger primitive types go first. 5005 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5006 } else { 5007 // Reference always goes first. 5008 return !is_primitive1; 5009 } 5010 } 5011 } 5012 // same basic group? then sort by string. 5013 return strcmp(field1->GetName(), field2->GetName()) < 0; 5014 } 5015}; 5016 5017bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5018 size_t* class_size) { 5019 self->AllowThreadSuspension(); 5020 size_t num_fields = 5021 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5022 5023 mirror::ObjectArray<mirror::ArtField>* fields = 5024 is_static ? klass->GetSFields() : klass->GetIFields(); 5025 5026 // Initialize field_offset 5027 MemberOffset field_offset(0); 5028 if (is_static) { 5029 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5030 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5031 // Static fields come after the embedded tables. 5032 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5033 0, 0, 0, 0, 0); 5034 } 5035 field_offset = MemberOffset(base); 5036 } else { 5037 mirror::Class* super_class = klass->GetSuperClass(); 5038 if (super_class != nullptr) { 5039 CHECK(super_class->IsResolved()) 5040 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5041 field_offset = MemberOffset(super_class->GetObjectSize()); 5042 } 5043 } 5044 5045 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5046 5047 // we want a relatively stable order so that adding new fields 5048 // minimizes disruption of C++ version such as Class and Method. 5049 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5050 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5051 "Naked ArtField references in deque"); 5052 for (size_t i = 0; i < num_fields; i++) { 5053 mirror::ArtField* f = fields->Get(i); 5054 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5055 grouped_and_sorted_fields.push_back(f); 5056 } 5057 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5058 LinkFieldsComparator()); 5059 5060 // References should be at the front. 5061 size_t current_field = 0; 5062 size_t num_reference_fields = 0; 5063 FieldGaps gaps; 5064 5065 for (; current_field < num_fields; current_field++) { 5066 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5067 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5068 bool isPrimitive = type != Primitive::kPrimNot; 5069 if (isPrimitive) { 5070 break; // past last reference, move on to the next phase 5071 } 5072 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5073 MemberOffset old_offset = field_offset; 5074 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5075 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5076 } 5077 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5078 grouped_and_sorted_fields.pop_front(); 5079 num_reference_fields++; 5080 fields->Set<false>(current_field, field); 5081 field->SetOffset(field_offset); 5082 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5083 } 5084 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5085 // otherwise we could end up with suboptimal gap fills. 5086 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5087 fields, &grouped_and_sorted_fields, &gaps); 5088 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5089 fields, &grouped_and_sorted_fields, &gaps); 5090 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5091 fields, &grouped_and_sorted_fields, &gaps); 5092 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5093 fields, &grouped_and_sorted_fields, &gaps); 5094 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5095 " fields."; 5096 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5097 5098 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5099 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5100 // We know there are no non-reference fields in the Reference classes, and we know 5101 // that 'referent' is alphabetically last, so this is easy... 5102 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5103 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5104 --num_reference_fields; 5105 } 5106 5107 if (kIsDebugBuild) { 5108 // Make sure that all reference fields appear before 5109 // non-reference fields, and all double-wide fields are aligned. 5110 bool seen_non_ref = false; 5111 for (size_t i = 0; i < num_fields; i++) { 5112 mirror::ArtField* field = fields->Get(i); 5113 if (false) { // enable to debug field layout 5114 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5115 << " class=" << PrettyClass(klass.Get()) 5116 << " field=" << PrettyField(field) 5117 << " offset=" 5118 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5119 } 5120 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5121 bool is_primitive = type != Primitive::kPrimNot; 5122 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5123 strcmp("referent", field->GetName()) == 0) { 5124 is_primitive = true; // We lied above, so we have to expect a lie here. 5125 } 5126 if (is_primitive) { 5127 if (!seen_non_ref) { 5128 seen_non_ref = true; 5129 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5130 } 5131 } else { 5132 DCHECK(!seen_non_ref) << PrettyField(field); 5133 } 5134 } 5135 if (!seen_non_ref) { 5136 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5137 } 5138 } 5139 5140 size_t size = field_offset.Uint32Value(); 5141 // Update klass 5142 if (is_static) { 5143 klass->SetNumReferenceStaticFields(num_reference_fields); 5144 *class_size = size; 5145 } else { 5146 klass->SetNumReferenceInstanceFields(num_reference_fields); 5147 if (!klass->IsVariableSize()) { 5148 std::string temp; 5149 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5150 size_t previous_size = klass->GetObjectSize(); 5151 if (previous_size != 0) { 5152 // Make sure that we didn't originally have an incorrect size. 5153 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5154 } 5155 klass->SetObjectSize(size); 5156 } 5157 } 5158 return true; 5159} 5160 5161// Set the bitmap of reference offsets, refOffsets, from the ifields 5162// list. 5163void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5164 uint32_t reference_offsets = 0; 5165 mirror::Class* super_class = klass->GetSuperClass(); 5166 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5167 if (super_class != nullptr) { 5168 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5169 // Compute reference offsets unless our superclass overflowed. 5170 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5171 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5172 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5173 // All of the fields that contain object references are guaranteed 5174 // to be at the beginning of the fields list. 5175 for (size_t i = 0; i < num_reference_fields; ++i) { 5176 // Note that byte_offset is the offset from the beginning of 5177 // object, not the offset into instance data 5178 mirror::ArtField* field = fields->Get(i); 5179 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5180 uint32_t displaced_bitmap_position = 5181 (byte_offset.Uint32Value() - mirror::kObjectHeaderSize) / 5182 sizeof(mirror::HeapReference<mirror::Object>); 5183 if (displaced_bitmap_position >= 32) { 5184 // Can't encode offset so fall back on slow-path. 5185 reference_offsets = mirror::Class::kClassWalkSuper; 5186 break; 5187 } else { 5188 reference_offsets |= (1 << displaced_bitmap_position); 5189 } 5190 } 5191 } 5192 } 5193 klass->SetReferenceInstanceOffsets(reference_offsets); 5194} 5195 5196mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5197 Handle<mirror::DexCache> dex_cache) { 5198 DCHECK(dex_cache.Get() != nullptr); 5199 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5200 if (resolved != nullptr) { 5201 return resolved; 5202 } 5203 uint32_t utf16_length; 5204 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5205 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5206 dex_cache->SetResolvedString(string_idx, string); 5207 return string; 5208} 5209 5210mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5211 mirror::Class* referrer) { 5212 StackHandleScope<2> hs(Thread::Current()); 5213 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5214 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5215 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5216} 5217 5218mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5219 Handle<mirror::DexCache> dex_cache, 5220 Handle<mirror::ClassLoader> class_loader) { 5221 DCHECK(dex_cache.Get() != nullptr); 5222 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5223 if (resolved == nullptr) { 5224 Thread* self = Thread::Current(); 5225 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5226 resolved = FindClass(self, descriptor, class_loader); 5227 if (resolved != nullptr) { 5228 // TODO: we used to throw here if resolved's class loader was not the 5229 // boot class loader. This was to permit different classes with the 5230 // same name to be loaded simultaneously by different loaders 5231 dex_cache->SetResolvedType(type_idx, resolved); 5232 } else { 5233 CHECK(self->IsExceptionPending()) 5234 << "Expected pending exception for failed resolution of: " << descriptor; 5235 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5236 StackHandleScope<1> hs(self); 5237 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5238 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5239 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5240 self->ClearException(); 5241 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5242 self->GetException(nullptr)->SetCause(cause.Get()); 5243 } 5244 } 5245 } 5246 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5247 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5248 return resolved; 5249} 5250 5251mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5252 Handle<mirror::DexCache> dex_cache, 5253 Handle<mirror::ClassLoader> class_loader, 5254 Handle<mirror::ArtMethod> referrer, 5255 InvokeType type) { 5256 DCHECK(dex_cache.Get() != nullptr); 5257 // Check for hit in the dex cache. 5258 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5259 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5260 return resolved; 5261 } 5262 // Fail, get the declaring class. 5263 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5264 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5265 if (klass == nullptr) { 5266 DCHECK(Thread::Current()->IsExceptionPending()); 5267 return nullptr; 5268 } 5269 // Scan using method_idx, this saves string compares but will only hit for matching dex 5270 // caches/files. 5271 switch (type) { 5272 case kDirect: // Fall-through. 5273 case kStatic: 5274 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5275 break; 5276 case kInterface: 5277 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5278 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5279 break; 5280 case kSuper: // Fall-through. 5281 case kVirtual: 5282 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5283 break; 5284 default: 5285 LOG(FATAL) << "Unreachable - invocation type: " << type; 5286 } 5287 if (resolved == nullptr) { 5288 // Search by name, which works across dex files. 5289 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5290 const Signature signature = dex_file.GetMethodSignature(method_id); 5291 switch (type) { 5292 case kDirect: // Fall-through. 5293 case kStatic: 5294 resolved = klass->FindDirectMethod(name, signature); 5295 break; 5296 case kInterface: 5297 resolved = klass->FindInterfaceMethod(name, signature); 5298 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5299 break; 5300 case kSuper: // Fall-through. 5301 case kVirtual: 5302 resolved = klass->FindVirtualMethod(name, signature); 5303 break; 5304 } 5305 } 5306 // If we found a method, check for incompatible class changes. 5307 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5308 // Be a good citizen and update the dex cache to speed subsequent calls. 5309 dex_cache->SetResolvedMethod(method_idx, resolved); 5310 return resolved; 5311 } else { 5312 // If we had a method, it's an incompatible-class-change error. 5313 if (resolved != nullptr) { 5314 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5315 } else { 5316 // We failed to find the method which means either an access error, an incompatible class 5317 // change, or no such method. First try to find the method among direct and virtual methods. 5318 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5319 const Signature signature = dex_file.GetMethodSignature(method_id); 5320 switch (type) { 5321 case kDirect: 5322 case kStatic: 5323 resolved = klass->FindVirtualMethod(name, signature); 5324 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5325 // have had a resolved method before, which triggers the "true" branch above. 5326 break; 5327 case kInterface: 5328 case kVirtual: 5329 case kSuper: 5330 resolved = klass->FindDirectMethod(name, signature); 5331 break; 5332 } 5333 5334 // If we found something, check that it can be accessed by the referrer. 5335 if (resolved != nullptr && referrer.Get() != nullptr) { 5336 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5337 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5338 if (!referring_class->CanAccess(methods_class)) { 5339 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5340 resolved, type); 5341 return nullptr; 5342 } else if (!referring_class->CanAccessMember(methods_class, 5343 resolved->GetAccessFlags())) { 5344 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5345 return nullptr; 5346 } 5347 } 5348 5349 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5350 // methods and throw if we find the method there. If we find nothing, throw a 5351 // NoSuchMethodError. 5352 switch (type) { 5353 case kDirect: 5354 case kStatic: 5355 if (resolved != nullptr) { 5356 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5357 } else { 5358 resolved = klass->FindInterfaceMethod(name, signature); 5359 if (resolved != nullptr) { 5360 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5361 } else { 5362 ThrowNoSuchMethodError(type, klass, name, signature); 5363 } 5364 } 5365 break; 5366 case kInterface: 5367 if (resolved != nullptr) { 5368 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5369 } else { 5370 resolved = klass->FindVirtualMethod(name, signature); 5371 if (resolved != nullptr) { 5372 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5373 } else { 5374 ThrowNoSuchMethodError(type, klass, name, signature); 5375 } 5376 } 5377 break; 5378 case kSuper: 5379 if (resolved != nullptr) { 5380 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5381 } else { 5382 ThrowNoSuchMethodError(type, klass, name, signature); 5383 } 5384 break; 5385 case kVirtual: 5386 if (resolved != nullptr) { 5387 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5388 } else { 5389 resolved = klass->FindInterfaceMethod(name, signature); 5390 if (resolved != nullptr) { 5391 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5392 } else { 5393 ThrowNoSuchMethodError(type, klass, name, signature); 5394 } 5395 } 5396 break; 5397 } 5398 } 5399 DCHECK(Thread::Current()->IsExceptionPending()); 5400 return nullptr; 5401 } 5402} 5403 5404mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5405 Handle<mirror::DexCache> dex_cache, 5406 Handle<mirror::ClassLoader> class_loader, 5407 bool is_static) { 5408 DCHECK(dex_cache.Get() != nullptr); 5409 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5410 if (resolved != nullptr) { 5411 return resolved; 5412 } 5413 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5414 Thread* const self = Thread::Current(); 5415 StackHandleScope<1> hs(self); 5416 Handle<mirror::Class> klass( 5417 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5418 if (klass.Get() == nullptr) { 5419 DCHECK(Thread::Current()->IsExceptionPending()); 5420 return nullptr; 5421 } 5422 5423 if (is_static) { 5424 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5425 } else { 5426 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5427 } 5428 5429 if (resolved == nullptr) { 5430 const char* name = dex_file.GetFieldName(field_id); 5431 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5432 if (is_static) { 5433 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5434 } else { 5435 resolved = klass->FindInstanceField(name, type); 5436 } 5437 if (resolved == nullptr) { 5438 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5439 return nullptr; 5440 } 5441 } 5442 dex_cache->SetResolvedField(field_idx, resolved); 5443 return resolved; 5444} 5445 5446mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5447 uint32_t field_idx, 5448 Handle<mirror::DexCache> dex_cache, 5449 Handle<mirror::ClassLoader> class_loader) { 5450 DCHECK(dex_cache.Get() != nullptr); 5451 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5452 if (resolved != nullptr) { 5453 return resolved; 5454 } 5455 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5456 Thread* self = Thread::Current(); 5457 StackHandleScope<1> hs(self); 5458 Handle<mirror::Class> klass( 5459 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5460 if (klass.Get() == nullptr) { 5461 DCHECK(Thread::Current()->IsExceptionPending()); 5462 return nullptr; 5463 } 5464 5465 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5466 StringPiece type(dex_file.StringDataByIdx( 5467 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5468 resolved = mirror::Class::FindField(self, klass, name, type); 5469 if (resolved != nullptr) { 5470 dex_cache->SetResolvedField(field_idx, resolved); 5471 } else { 5472 ThrowNoSuchFieldError("", klass.Get(), type, name); 5473 } 5474 return resolved; 5475} 5476 5477const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5478 uint32_t* length) { 5479 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5480 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5481 const DexFile& dex_file = *dex_cache->GetDexFile(); 5482 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5483 return dex_file.GetMethodShorty(method_id, length); 5484} 5485 5486void ClassLinker::DumpAllClasses(int flags) { 5487 if (dex_cache_image_class_lookup_required_) { 5488 MoveImageClassesToClassTable(); 5489 } 5490 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5491 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5492 std::vector<mirror::Class*> all_classes; 5493 { 5494 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5495 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5496 mirror::Class* klass = it.second.Read(); 5497 all_classes.push_back(klass); 5498 } 5499 } 5500 5501 for (size_t i = 0; i < all_classes.size(); ++i) { 5502 all_classes[i]->DumpClass(std::cerr, flags); 5503 } 5504} 5505 5506static OatFile::OatMethod CreateOatMethod(const void* code, const uint8_t* gc_map, 5507 bool is_portable) { 5508 CHECK_EQ(kUsePortableCompiler, is_portable); 5509 CHECK(code != nullptr); 5510 const uint8_t* base; 5511 uint32_t code_offset, gc_map_offset; 5512 if (gc_map == nullptr) { 5513 base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5514 base -= sizeof(void*); // Move backward so that code_offset != 0. 5515 code_offset = sizeof(void*); 5516 gc_map_offset = 0; 5517 } else { 5518 // TODO: 64bit support. 5519 base = nullptr; // Base of data in oat file, ie 0. 5520 code_offset = PointerToLowMemUInt32(code); 5521 gc_map_offset = PointerToLowMemUInt32(gc_map); 5522 } 5523 return OatFile::OatMethod(base, code_offset, gc_map_offset); 5524} 5525 5526bool ClassLinker::IsPortableResolutionStub(const void* entry_point) const { 5527 return (entry_point == GetPortableResolutionStub()) || 5528 (portable_resolution_trampoline_ == entry_point); 5529} 5530 5531bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5532 return (entry_point == GetQuickResolutionStub()) || 5533 (quick_resolution_trampoline_ == entry_point); 5534} 5535 5536bool ClassLinker::IsPortableToInterpreterBridge(const void* entry_point) const { 5537 return (entry_point == GetPortableToInterpreterBridge()); 5538 // TODO: portable_to_interpreter_bridge_trampoline_ == entry_point; 5539} 5540 5541bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5542 return (entry_point == GetQuickToInterpreterBridge()) || 5543 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5544} 5545 5546bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5547 return (entry_point == GetQuickGenericJniStub()) || 5548 (quick_generic_jni_trampoline_ == entry_point); 5549} 5550 5551const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5552 return GetQuickGenericJniStub(); 5553} 5554 5555void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code, 5556 bool is_portable) const { 5557 OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr, is_portable); 5558 oat_method.LinkMethod(method); 5559 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5560 // Create bridges to transition between different kinds of compiled bridge. 5561 if (method->GetEntryPointFromPortableCompiledCode() == nullptr) { 5562 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5563 } else { 5564 CHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 5565 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 5566 method->SetIsPortableCompiled(); 5567 } 5568} 5569 5570void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5571 if (!method->IsNative()) { 5572 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5573 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 5574 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5575 } else { 5576 const void* quick_method_code = GetQuickGenericJniStub(); 5577 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code, nullptr, false); 5578 oat_method.LinkMethod(method); 5579 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5580 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5581 } 5582} 5583 5584void ClassLinker::DumpForSigQuit(std::ostream& os) { 5585 Thread* self = Thread::Current(); 5586 if (dex_cache_image_class_lookup_required_) { 5587 ScopedObjectAccess soa(self); 5588 MoveImageClassesToClassTable(); 5589 } 5590 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5591 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5592} 5593 5594size_t ClassLinker::NumLoadedClasses() { 5595 if (dex_cache_image_class_lookup_required_) { 5596 MoveImageClassesToClassTable(); 5597 } 5598 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5599 return class_table_.size(); 5600} 5601 5602pid_t ClassLinker::GetClassesLockOwner() { 5603 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5604} 5605 5606pid_t ClassLinker::GetDexLockOwner() { 5607 return dex_lock_.GetExclusiveOwnerTid(); 5608} 5609 5610void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5611 DCHECK(!init_done_); 5612 5613 DCHECK(klass != nullptr); 5614 DCHECK(klass->GetClassLoader() == nullptr); 5615 5616 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5617 DCHECK(class_roots != nullptr); 5618 DCHECK(class_roots->Get(class_root) == nullptr); 5619 class_roots->Set<false>(class_root, klass); 5620} 5621 5622const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5623 static const char* class_roots_descriptors[] = { 5624 "Ljava/lang/Class;", 5625 "Ljava/lang/Object;", 5626 "[Ljava/lang/Class;", 5627 "[Ljava/lang/Object;", 5628 "Ljava/lang/String;", 5629 "Ljava/lang/DexCache;", 5630 "Ljava/lang/ref/Reference;", 5631 "Ljava/lang/reflect/ArtField;", 5632 "Ljava/lang/reflect/ArtMethod;", 5633 "Ljava/lang/reflect/Proxy;", 5634 "[Ljava/lang/String;", 5635 "[Ljava/lang/reflect/ArtField;", 5636 "[Ljava/lang/reflect/ArtMethod;", 5637 "Ljava/lang/ClassLoader;", 5638 "Ljava/lang/Throwable;", 5639 "Ljava/lang/ClassNotFoundException;", 5640 "Ljava/lang/StackTraceElement;", 5641 "Z", 5642 "B", 5643 "C", 5644 "D", 5645 "F", 5646 "I", 5647 "J", 5648 "S", 5649 "V", 5650 "[Z", 5651 "[B", 5652 "[C", 5653 "[D", 5654 "[F", 5655 "[I", 5656 "[J", 5657 "[S", 5658 "[Ljava/lang/StackTraceElement;", 5659 }; 5660 COMPILE_ASSERT(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5661 mismatch_between_class_descriptors_and_class_root_enum); 5662 5663 const char* descriptor = class_roots_descriptors[class_root]; 5664 CHECK(descriptor != nullptr); 5665 return descriptor; 5666} 5667 5668} // namespace art 5669