class_linker.cc revision d035c2d0523f29cb3c4fcc14a80d2a8ceadec3ba
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <iostream> 21#include <memory> 22#include <queue> 23#include <string> 24#include <utility> 25#include <vector> 26 27#include "base/casts.h" 28#include "base/logging.h" 29#include "base/scoped_flock.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "entrypoints/runtime_asm_entrypoints.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread-inl.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 Runtime* runtime = Runtime::Current(); 95 bool is_compiler = runtime->IsCompiler(); 96 if (!is_compiler) { // Give info if this occurs at runtime. 97 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 98 } 99 100 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 101 Thread* self = Thread::Current(); 102 if (is_compiler) { 103 // At compile time, accurate errors and NCDFE are disabled to speed compilation. 104 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError(); 105 self->SetException(ThrowLocation(), pre_allocated); 106 } else { 107 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 108 if (c->GetVerifyErrorClass() != NULL) { 109 // TODO: change the verifier to store an _instance_, with a useful detail message? 110 std::string temp; 111 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 112 PrettyDescriptor(c).c_str()); 113 } else { 114 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 115 PrettyDescriptor(c).c_str()); 116 } 117 } 118} 119 120static void VlogClassInitializationFailure(Handle<mirror::Class> klass) 121 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 122 if (VLOG_IS_ON(class_linker)) { 123 std::string temp; 124 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from " 125 << klass->GetLocation() << "\n" << Thread::Current()->GetException(nullptr)->Dump(); 126 } 127} 128 129static void WrapExceptionInInitializer(Handle<mirror::Class> klass) 130 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 131 Thread* self = Thread::Current(); 132 JNIEnv* env = self->GetJniEnv(); 133 134 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 135 CHECK(cause.get() != nullptr); 136 137 env->ExceptionClear(); 138 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 139 env->Throw(cause.get()); 140 141 // We only wrap non-Error exceptions; an Error can just be used as-is. 142 if (!is_error) { 143 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 144 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 145 nullptr); 146 } 147 VlogClassInitializationFailure(klass); 148} 149 150static size_t Hash(const char* s) { 151 // This is the java.lang.String hashcode for convenience, not interoperability. 152 size_t hash = 0; 153 for (; *s != '\0'; ++s) { 154 hash = hash * 31 + *s; 155 } 156 return hash; 157} 158 159// Gap between two fields in object layout. 160struct FieldGap { 161 uint32_t start_offset; // The offset from the start of the object. 162 uint32_t size; // The gap size of 1, 2, or 4 bytes. 163}; 164struct FieldGapsComparator { 165 explicit FieldGapsComparator() { 166 } 167 bool operator() (const FieldGap& lhs, const FieldGap& rhs) 168 NO_THREAD_SAFETY_ANALYSIS { 169 // Sort by gap size, largest first. 170 return lhs.size > rhs.size; 171 } 172}; 173typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps; 174 175// Adds largest aligned gaps to queue of gaps. 176void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) { 177 DCHECK(gaps != nullptr); 178 179 uint32_t current_offset = gap_start; 180 while (current_offset != gap_end) { 181 size_t remaining = gap_end - current_offset; 182 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) { 183 gaps->push(FieldGap {current_offset, sizeof(uint32_t)}); 184 current_offset += sizeof(uint32_t); 185 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) { 186 gaps->push(FieldGap {current_offset, sizeof(uint16_t)}); 187 current_offset += sizeof(uint16_t); 188 } else { 189 gaps->push(FieldGap {current_offset, sizeof(uint8_t)}); 190 current_offset += sizeof(uint8_t); 191 } 192 DCHECK_LE(current_offset, gap_end) << "Overran gap"; 193 } 194} 195// Shuffle fields forward, making use of gaps whenever possible. 196template<int n> 197static void ShuffleForward(const size_t num_fields, size_t* current_field_idx, 198 MemberOffset* field_offset, 199 mirror::ObjectArray<mirror::ArtField>* fields, 200 std::deque<mirror::ArtField*>* grouped_and_sorted_fields, 201 FieldGaps* gaps) 202 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 203 DCHECK(current_field_idx != nullptr); 204 DCHECK(grouped_and_sorted_fields != nullptr); 205 DCHECK(fields != nullptr || (num_fields == 0 && grouped_and_sorted_fields->empty())); 206 DCHECK(gaps != nullptr); 207 DCHECK(field_offset != nullptr); 208 209 DCHECK(IsPowerOfTwo(n)); 210 while (!grouped_and_sorted_fields->empty()) { 211 mirror::ArtField* field = grouped_and_sorted_fields->front(); 212 Primitive::Type type = field->GetTypeAsPrimitiveType(); 213 if (Primitive::ComponentSize(type) < n) { 214 break; 215 } 216 if (!IsAligned<n>(field_offset->Uint32Value())) { 217 MemberOffset old_offset = *field_offset; 218 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n)); 219 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps); 220 } 221 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 222 grouped_and_sorted_fields->pop_front(); 223 fields->Set<false>(*current_field_idx, field); 224 if (!gaps->empty() && gaps->top().size >= n) { 225 FieldGap gap = gaps->top(); 226 gaps->pop(); 227 DCHECK(IsAligned<n>(gap.start_offset)); 228 field->SetOffset(MemberOffset(gap.start_offset)); 229 if (gap.size > n) { 230 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps); 231 } 232 } else { 233 DCHECK(IsAligned<n>(field_offset->Uint32Value())); 234 field->SetOffset(*field_offset); 235 *field_offset = MemberOffset(field_offset->Uint32Value() + n); 236 } 237 ++(*current_field_idx); 238 } 239} 240 241ClassLinker::ClassLinker(InternTable* intern_table) 242 // dex_lock_ is recursive as it may be used in stack dumping. 243 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 244 dex_cache_image_class_lookup_required_(false), 245 failed_dex_cache_class_lookups_(0), 246 class_roots_(nullptr), 247 array_iftable_(nullptr), 248 find_array_class_cache_next_victim_(0), 249 init_done_(false), 250 log_new_dex_caches_roots_(false), 251 log_new_class_table_roots_(false), 252 intern_table_(intern_table), 253 portable_resolution_trampoline_(nullptr), 254 quick_resolution_trampoline_(nullptr), 255 portable_imt_conflict_trampoline_(nullptr), 256 quick_imt_conflict_trampoline_(nullptr), 257 quick_generic_jni_trampoline_(nullptr), 258 quick_to_interpreter_bridge_trampoline_(nullptr) { 259 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 260} 261 262void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 263 VLOG(startup) << "ClassLinker::Init"; 264 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 265 266 CHECK(!init_done_); 267 268 // java_lang_Class comes first, it's needed for AllocClass 269 Thread* self = Thread::Current(); 270 gc::Heap* heap = Runtime::Current()->GetHeap(); 271 // The GC can't handle an object with a null class since we can't get the size of this object. 272 heap->IncrementDisableMovingGC(self); 273 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 274 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 275 heap->AllocNonMovableObject<true>(self, nullptr, 276 mirror::Class::ClassClassSize(), 277 VoidFunctor())))); 278 CHECK(java_lang_Class.Get() != nullptr); 279 mirror::Class::SetClassClass(java_lang_Class.Get()); 280 java_lang_Class->SetClass(java_lang_Class.Get()); 281 if (kUseBakerOrBrooksReadBarrier) { 282 java_lang_Class->AssertReadBarrierPointer(); 283 } 284 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 285 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot); 286 heap->DecrementDisableMovingGC(self); 287 // AllocClass(mirror::Class*) can now be used 288 289 // Class[] is used for reflection support. 290 Handle<mirror::Class> class_array_class(hs.NewHandle( 291 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 292 class_array_class->SetComponentType(java_lang_Class.Get()); 293 294 // java_lang_Object comes next so that object_array_class can be created. 295 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 297 CHECK(java_lang_Object.Get() != nullptr); 298 // backfill Object as the super class of Class. 299 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 300 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 301 302 // Object[] next to hold class roots. 303 Handle<mirror::Class> object_array_class(hs.NewHandle( 304 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 305 object_array_class->SetComponentType(java_lang_Object.Get()); 306 307 // Setup the char (primitive) class to be used for char[]. 308 Handle<mirror::Class> char_class(hs.NewHandle( 309 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 310 // The primitive char class won't be initialized by 311 // InitializePrimitiveClass until line 459, but strings (and 312 // internal char arrays) will be allocated before that and the 313 // component size, which is computed from the primitive type, needs 314 // to be set here. 315 char_class->SetPrimitiveType(Primitive::kPrimChar); 316 317 // Setup the char[] class to be used for String. 318 Handle<mirror::Class> char_array_class(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), 320 mirror::Array::ClassSize()))); 321 char_array_class->SetComponentType(char_class.Get()); 322 mirror::CharArray::SetArrayClass(char_array_class.Get()); 323 324 // Setup String. 325 Handle<mirror::Class> java_lang_String(hs.NewHandle( 326 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 327 mirror::String::SetClass(java_lang_String.Get()); 328 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 329 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 330 331 // Setup Reference. 332 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 333 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 334 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 335 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 336 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 337 338 // Create storage for root classes, save away our work so far (requires descriptors). 339 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 340 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 341 kClassRootsMax)); 342 CHECK(!class_roots_.IsNull()); 343 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 344 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 345 SetClassRoot(kClassArrayClass, class_array_class.Get()); 346 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 347 SetClassRoot(kCharArrayClass, char_array_class.Get()); 348 SetClassRoot(kJavaLangString, java_lang_String.Get()); 349 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 350 351 // Setup the primitive type classes. 352 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 353 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 354 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 355 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 356 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 357 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 358 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 359 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 360 361 // Create array interface entries to populate once we can load system classes. 362 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 363 364 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 365 Handle<mirror::Class> int_array_class(hs.NewHandle( 366 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 367 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 368 mirror::IntArray::SetArrayClass(int_array_class.Get()); 369 SetClassRoot(kIntArrayClass, int_array_class.Get()); 370 371 // now that these are registered, we can use AllocClass() and AllocObjectArray 372 373 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 374 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 375 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 376 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 377 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 378 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 379 380 // Constructor, Field, Method, and AbstractMethod are necessary so 381 // that FindClass can link members. 382 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 383 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 384 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 385 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 386 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 387 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 388 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 389 390 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 391 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 392 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 393 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 394 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 395 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 396 397 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 398 399 // Set up array classes for string, field, method 400 Handle<mirror::Class> object_array_string(hs.NewHandle( 401 AllocClass(self, java_lang_Class.Get(), 402 mirror::ObjectArray<mirror::String>::ClassSize()))); 403 object_array_string->SetComponentType(java_lang_String.Get()); 404 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 405 406 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 407 AllocClass(self, java_lang_Class.Get(), 408 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 409 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 410 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 411 412 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 413 AllocClass(self, java_lang_Class.Get(), 414 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 415 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 416 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 417 418 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 419 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 420 // these roots. 421 CHECK_NE(0U, boot_class_path.size()); 422 for (size_t i = 0; i != boot_class_path.size(); ++i) { 423 const DexFile* dex_file = boot_class_path[i]; 424 CHECK(dex_file != nullptr); 425 AppendToBootClassPath(self, *dex_file); 426 } 427 428 // now we can use FindSystemClass 429 430 // run char class through InitializePrimitiveClass to finish init 431 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 432 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 433 434 // Create runtime resolution and imt conflict methods. Also setup the default imt. 435 Runtime* runtime = Runtime::Current(); 436 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 437 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 438 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 439 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 440 441 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 442 // we do not need friend classes or a publicly exposed setter. 443 quick_generic_jni_trampoline_ = GetQuickGenericJniStub(); 444 if (!runtime->IsCompiler()) { 445 // We need to set up the generic trampolines since we don't have an image. 446 quick_resolution_trampoline_ = GetQuickResolutionStub(); 447 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub(); 448 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge(); 449 } 450 451 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 452 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 453 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 454 CHECK_EQ(java_lang_Object.Get(), Object_class); 455 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 456 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 457 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 458 std::ostringstream os1, os2; 459 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 460 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 461 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 462 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 463 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 464 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 465 CHECK_EQ(java_lang_String.Get(), String_class); 466 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 467 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 468 469 // Setup the primitive array type classes - can't be done until Object has a vtable. 470 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 471 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 472 473 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 474 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 475 476 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 477 CHECK_EQ(char_array_class.Get(), found_char_array_class); 478 479 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 480 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 481 482 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 483 CHECK_EQ(int_array_class.Get(), found_int_array_class); 484 485 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 486 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 487 488 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 489 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 490 491 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 492 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 493 494 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 495 CHECK_EQ(class_array_class.Get(), found_class_array_class); 496 497 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 498 CHECK_EQ(object_array_class.Get(), found_object_array_class); 499 500 // Setup the single, global copy of "iftable". 501 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 502 CHECK(java_lang_Cloneable != nullptr); 503 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 504 CHECK(java_io_Serializable != nullptr); 505 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 506 // crawl up and explicitly list all of the supers as well. 507 { 508 mirror::IfTable* array_iftable = array_iftable_.Read(); 509 array_iftable->SetInterface(0, java_lang_Cloneable); 510 array_iftable->SetInterface(1, java_io_Serializable); 511 } 512 513 // Sanity check Class[] and Object[]'s interfaces. 514 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 515 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 516 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 517 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 518 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 519 // dex_cache_ fields and register them in class_table_. 520 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 521 CHECK_EQ(java_lang_Class.Get(), Class_class); 522 523 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 524 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 525 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 526 527 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 528 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 529 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 530 531 mirror::Class* String_array_class = 532 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)); 533 CHECK_EQ(object_array_string.Get(), String_array_class); 534 535 mirror::Class* Art_method_array_class = 536 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)); 537 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 538 539 mirror::Class* Art_field_array_class = 540 FindSystemClass(self, GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)); 541 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 542 543 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 544 545 // Create java.lang.reflect.Proxy root. 546 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 547 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 548 549 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 550 // finish initializing Reference class 551 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 552 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 553 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 554 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 555 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 556 mirror::Class* java_lang_ref_FinalizerReference = 557 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 558 java_lang_ref_FinalizerReference->SetAccessFlags( 559 java_lang_ref_FinalizerReference->GetAccessFlags() | 560 kAccClassIsReference | kAccClassIsFinalizerReference); 561 mirror::Class* java_lang_ref_PhantomReference = 562 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 563 java_lang_ref_PhantomReference->SetAccessFlags( 564 java_lang_ref_PhantomReference->GetAccessFlags() | 565 kAccClassIsReference | kAccClassIsPhantomReference); 566 mirror::Class* java_lang_ref_SoftReference = 567 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 568 java_lang_ref_SoftReference->SetAccessFlags( 569 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 570 mirror::Class* java_lang_ref_WeakReference = 571 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 572 java_lang_ref_WeakReference->SetAccessFlags( 573 java_lang_ref_WeakReference->GetAccessFlags() | 574 kAccClassIsReference | kAccClassIsWeakReference); 575 576 // Setup the ClassLoader, verifying the object_size_. 577 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 578 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 579 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 580 581 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 582 // java.lang.StackTraceElement as a convenience. 583 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 584 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 585 SetClassRoot(kJavaLangClassNotFoundException, 586 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 587 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 588 SetClassRoot(kJavaLangStackTraceElementArrayClass, 589 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 590 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 591 592 FinishInit(self); 593 594 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 595} 596 597void ClassLinker::FinishInit(Thread* self) { 598 VLOG(startup) << "ClassLinker::FinishInit entering"; 599 600 // Let the heap know some key offsets into java.lang.ref instances 601 // Note: we hard code the field indexes here rather than using FindInstanceField 602 // as the types of the field can't be resolved prior to the runtime being 603 // fully initialized 604 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 605 mirror::Class* java_lang_ref_FinalizerReference = 606 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 607 608 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 609 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 610 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 611 612 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 613 CHECK_STREQ(queue->GetName(), "queue"); 614 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 615 616 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 617 CHECK_STREQ(queueNext->GetName(), "queueNext"); 618 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 619 620 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 621 CHECK_STREQ(referent->GetName(), "referent"); 622 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 623 624 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 625 CHECK_STREQ(zombie->GetName(), "zombie"); 626 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 627 628 // ensure all class_roots_ are initialized 629 for (size_t i = 0; i < kClassRootsMax; i++) { 630 ClassRoot class_root = static_cast<ClassRoot>(i); 631 mirror::Class* klass = GetClassRoot(class_root); 632 CHECK(klass != nullptr); 633 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 634 // note SetClassRoot does additional validation. 635 // if possible add new checks there to catch errors early 636 } 637 638 CHECK(!array_iftable_.IsNull()); 639 640 // disable the slow paths in FindClass and CreatePrimitiveClass now 641 // that Object, Class, and Object[] are setup 642 init_done_ = true; 643 644 VLOG(startup) << "ClassLinker::FinishInit exiting"; 645} 646 647void ClassLinker::RunRootClinits() { 648 Thread* self = Thread::Current(); 649 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 650 mirror::Class* c = GetClassRoot(ClassRoot(i)); 651 if (!c->IsArrayClass() && !c->IsPrimitive()) { 652 StackHandleScope<1> hs(self); 653 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 654 EnsureInitialized(self, h_class, true, true); 655 self->AssertNoPendingException(); 656 } 657 } 658} 659 660bool ClassLinker::GenerateOatFile(const char* dex_filename, 661 int oat_fd, 662 const char* oat_cache_filename, 663 std::string* error_msg) { 664 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 665 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 666 667 gc::Heap* heap = Runtime::Current()->GetHeap(); 668 std::string boot_image_option("--boot-image="); 669 if (heap->GetImageSpace() == nullptr) { 670 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 671 // out of space anyway it might not matter. 672 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 673 "without an image.", dex_filename); 674 return false; 675 } 676 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 677 678 std::string dex_file_option("--dex-file="); 679 dex_file_option += dex_filename; 680 681 std::string oat_fd_option("--oat-fd="); 682 StringAppendF(&oat_fd_option, "%d", oat_fd); 683 684 std::string oat_location_option("--oat-location="); 685 oat_location_option += oat_cache_filename; 686 687 std::vector<std::string> argv; 688 argv.push_back(dex2oat); 689 argv.push_back("--runtime-arg"); 690 argv.push_back("-classpath"); 691 argv.push_back("--runtime-arg"); 692 argv.push_back(Runtime::Current()->GetClassPathString()); 693 694 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 695 696 if (!Runtime::Current()->IsVerificationEnabled()) { 697 argv.push_back("--compiler-filter=verify-none"); 698 } 699 700 if (Runtime::Current()->MustRelocateIfPossible()) { 701 argv.push_back("--runtime-arg"); 702 argv.push_back("-Xrelocate"); 703 } else { 704 argv.push_back("--runtime-arg"); 705 argv.push_back("-Xnorelocate"); 706 } 707 708 if (!kIsTargetBuild) { 709 argv.push_back("--host"); 710 } 711 712 argv.push_back(boot_image_option); 713 argv.push_back(dex_file_option); 714 argv.push_back(oat_fd_option); 715 argv.push_back(oat_location_option); 716 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 717 for (size_t i = 0; i < compiler_options.size(); ++i) { 718 argv.push_back(compiler_options[i].c_str()); 719 } 720 721 return Exec(argv, error_msg); 722} 723 724const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 725 WriterMutexLock mu(Thread::Current(), dex_lock_); 726 if (kIsDebugBuild) { 727 for (size_t i = 0; i < oat_files_.size(); ++i) { 728 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 729 } 730 } 731 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 732 oat_files_.push_back(oat_file); 733 return oat_file; 734} 735 736OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 737 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 738 OatFile* oat_file = space->ReleaseOatFile(); 739 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 740 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 741 return *oat_file; 742} 743 744const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 745 const char* dex_location = dex_file.GetLocation().c_str(); 746 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 747 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 748} 749 750const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 751 const char* dex_location, 752 const uint32_t* dex_location_checksum) { 753 ReaderMutexLock mu(Thread::Current(), dex_lock_); 754 for (const OatFile* oat_file : oat_files_) { 755 DCHECK(oat_file != nullptr); 756 757 if (oat_location != nullptr) { 758 if (oat_file->GetLocation() != oat_location) { 759 continue; 760 } 761 } 762 763 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 764 dex_location_checksum, 765 false); 766 if (oat_dex_file != nullptr) { 767 return oat_dex_file; 768 } 769 } 770 return nullptr; 771} 772 773 774// Loads all multi dex files from the given oat file returning true on success. 775// 776// Parameters: 777// oat_file - the oat file to load from 778// dex_location - the dex location used to generate the oat file 779// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 780// generated - whether or not the oat_file existed before or was just (re)generated 781// error_msgs - any error messages will be appended here 782// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 783static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 784 const char* dex_location, 785 const uint32_t* dex_location_checksum, 786 bool generated, 787 std::vector<std::string>* error_msgs, 788 std::vector<const DexFile*>* dex_files) { 789 if (oat_file == nullptr) { 790 return false; 791 } 792 793 size_t old_size = dex_files->size(); // To rollback on error. 794 795 bool success = true; 796 for (size_t i = 0; success; ++i) { 797 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 798 const char* next_name = next_name_str.c_str(); 799 800 uint32_t next_location_checksum; 801 uint32_t* next_location_checksum_pointer = &next_location_checksum; 802 std::string error_msg; 803 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 804 // When i=0 the multidex name should be the same as the location name. We already have the 805 // checksum it so we don't need to recompute it. 806 if (dex_location_checksum == nullptr) { 807 next_location_checksum_pointer = nullptr; 808 } else { 809 next_location_checksum = *dex_location_checksum; 810 } 811 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 812 DCHECK_EQ(false, i == 0 && generated); 813 next_location_checksum_pointer = nullptr; 814 } 815 816 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 817 818 if (oat_dex_file == nullptr) { 819 if (i == 0 && generated) { 820 std::string error_msg; 821 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 822 " file'%s'", dex_location, next_location_checksum, 823 oat_file->GetLocation().c_str()); 824 error_msgs->push_back(error_msg); 825 } 826 break; // Not found, done. 827 } 828 829 // Checksum test. Test must succeed when generated. 830 success = !generated; 831 if (next_location_checksum_pointer != nullptr) { 832 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 833 } 834 835 if (success) { 836 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 837 if (dex_file == nullptr) { 838 success = false; 839 error_msgs->push_back(error_msg); 840 } else { 841 dex_files->push_back(dex_file); 842 } 843 } 844 845 // When we generated the file, we expect success, or something is terribly wrong. 846 CHECK_EQ(false, generated && !success) 847 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 848 << std::hex << " dex_location_checksum=" << next_location_checksum 849 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 850 } 851 852 if (dex_files->size() == old_size) { 853 success = false; // We did not even find classes.dex 854 } 855 856 if (success) { 857 return true; 858 } else { 859 // Free all the dex files we have loaded. 860 auto it = dex_files->begin() + old_size; 861 auto it_end = dex_files->end(); 862 for (; it != it_end; it++) { 863 delete *it; 864 } 865 dex_files->erase(dex_files->begin() + old_size, it_end); 866 867 return false; 868 } 869} 870 871// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 872// complicates the loading process, as we should not use an iterative loading process, because that 873// would register the oat file and dex files that come before the broken one. Instead, check all 874// multidex ahead of time. 875bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 876 std::vector<std::string>* error_msgs, 877 std::vector<const DexFile*>* dex_files) { 878 // 1) Check whether we have an open oat file. 879 // This requires a dex checksum, use the "primary" one. 880 uint32_t dex_location_checksum; 881 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 882 bool have_checksum = true; 883 std::string checksum_error_msg; 884 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 885 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 886 dex_location_checksum_pointer = nullptr; 887 have_checksum = false; 888 } 889 890 bool needs_registering = false; 891 892 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 893 dex_location_checksum_pointer); 894 std::unique_ptr<const OatFile> open_oat_file( 895 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 896 897 // 2) If we do not have an open one, maybe there's one on disk already. 898 899 // In case the oat file is not open, we play a locking game here so 900 // that if two different processes race to load and register or generate 901 // (or worse, one tries to open a partial generated file) we will be okay. 902 // This is actually common with apps that use DexClassLoader to work 903 // around the dex method reference limit and that have a background 904 // service running in a separate process. 905 ScopedFlock scoped_flock; 906 907 if (open_oat_file.get() == nullptr) { 908 if (oat_location != nullptr) { 909 // Can only do this if we have a checksum, else error. 910 if (!have_checksum) { 911 error_msgs->push_back(checksum_error_msg); 912 return false; 913 } 914 915 std::string error_msg; 916 917 // We are loading or creating one in the future. Time to set up the file lock. 918 if (!scoped_flock.Init(oat_location, &error_msg)) { 919 error_msgs->push_back(error_msg); 920 return false; 921 } 922 923 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 924 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 925 oat_location, &error_msg)); 926 927 if (open_oat_file.get() == nullptr) { 928 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 929 dex_location, oat_location, error_msg.c_str()); 930 VLOG(class_linker) << compound_msg; 931 error_msgs->push_back(compound_msg); 932 } 933 } else { 934 // TODO: What to lock here? 935 bool obsolete_file_cleanup_failed; 936 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 937 dex_location_checksum_pointer, 938 kRuntimeISA, error_msgs, 939 &obsolete_file_cleanup_failed)); 940 // There's no point in going forward and eventually try to regenerate the 941 // file if we couldn't remove the obsolete one. Mostly likely we will fail 942 // with the same error when trying to write the new file. 943 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 944 if (obsolete_file_cleanup_failed) { 945 return false; 946 } 947 } 948 needs_registering = true; 949 } 950 951 // 3) If we have an oat file, check all contained multidex files for our dex_location. 952 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 953 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 954 dex_location_checksum_pointer, 955 false, error_msgs, dex_files); 956 if (success) { 957 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 958 if (needs_registering) { 959 // We opened the oat file, so we must register it. 960 RegisterOatFile(oat_file); 961 } 962 // If the file isn't executable we failed patchoat but did manage to get the dex files. 963 return oat_file->IsExecutable(); 964 } else { 965 if (needs_registering) { 966 // We opened it, delete it. 967 open_oat_file.reset(); 968 } else { 969 open_oat_file.release(); // Do not delete open oat files. 970 } 971 } 972 973 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 974 975 // Need a checksum, fail else. 976 if (!have_checksum) { 977 error_msgs->push_back(checksum_error_msg); 978 return false; 979 } 980 981 // Look in cache location if no oat_location is given. 982 std::string cache_location; 983 if (oat_location == nullptr) { 984 // Use the dalvik cache. 985 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 986 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 987 oat_location = cache_location.c_str(); 988 } 989 990 bool has_flock = true; 991 // Definitely need to lock now. 992 if (!scoped_flock.HasFile()) { 993 std::string error_msg; 994 if (!scoped_flock.Init(oat_location, &error_msg)) { 995 error_msgs->push_back(error_msg); 996 has_flock = false; 997 } 998 } 999 1000 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 1001 // Create the oat file. 1002 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 1003 oat_location, error_msgs)); 1004 } 1005 1006 // Failed, bail. 1007 if (open_oat_file.get() == nullptr) { 1008 std::string error_msg; 1009 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 1010 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 1011 error_msgs->push_back(error_msg); 1012 return false; 1013 } 1014 1015 // Try to load again, but stronger checks. 1016 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 1017 dex_location_checksum_pointer, 1018 true, error_msgs, dex_files); 1019 if (success) { 1020 RegisterOatFile(open_oat_file.release()); 1021 return true; 1022 } else { 1023 return false; 1024 } 1025} 1026 1027const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 1028 uint32_t dex_location_checksum, 1029 const char* oat_location, 1030 std::string* error_msg) { 1031 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1032 !Runtime::Current()->IsCompiler(), 1033 error_msg)); 1034 if (oat_file.get() == nullptr) { 1035 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 1036 error_msg->c_str()); 1037 return nullptr; 1038 } 1039 Runtime* runtime = Runtime::Current(); 1040 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1041 if (image_space != nullptr) { 1042 const ImageHeader& image_header = image_space->GetImageHeader(); 1043 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 1044 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 1045 if (expected_image_oat_checksum != actual_image_oat_checksum) { 1046 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 1047 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1048 actual_image_oat_checksum); 1049 return nullptr; 1050 } 1051 1052 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1053 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1054 if (expected_image_oat_offset != actual_image_oat_offset) { 1055 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1056 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1057 actual_image_oat_offset); 1058 return nullptr; 1059 } 1060 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1061 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1062 if (expected_patch_delta != actual_patch_delta) { 1063 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1064 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1065 return nullptr; 1066 } 1067 } 1068 1069 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1070 &dex_location_checksum); 1071 if (oat_dex_file == nullptr) { 1072 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1073 dex_location); 1074 return nullptr; 1075 } 1076 uint32_t expected_dex_checksum = dex_location_checksum; 1077 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1078 if (expected_dex_checksum != actual_dex_checksum) { 1079 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1080 "found 0x%x", oat_location, expected_dex_checksum, 1081 actual_dex_checksum); 1082 return nullptr; 1083 } 1084 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1085 if (dex_file.get() != nullptr) { 1086 return oat_file.release(); 1087 } else { 1088 return nullptr; 1089 } 1090} 1091 1092const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1093 int fd, const char* oat_location, 1094 std::vector<std::string>* error_msgs) { 1095 // Generate the output oat file for the dex file 1096 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1097 std::string error_msg; 1098 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1099 CHECK(!error_msg.empty()); 1100 error_msgs->push_back(error_msg); 1101 return nullptr; 1102 } 1103 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1104 !Runtime::Current()->IsCompiler(), 1105 &error_msg)); 1106 if (oat_file.get() == nullptr) { 1107 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1108 oat_location, error_msg.c_str()); 1109 error_msgs->push_back(compound_msg); 1110 return nullptr; 1111 } 1112 1113 return oat_file.release(); 1114} 1115 1116bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1117 const InstructionSet instruction_set) { 1118 Runtime* runtime = Runtime::Current(); 1119 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1120 if (image_space == nullptr) { 1121 return false; 1122 } 1123 uint32_t image_oat_checksum = 0; 1124 if (instruction_set == kRuntimeISA) { 1125 const ImageHeader& image_header = image_space->GetImageHeader(); 1126 image_oat_checksum = image_header.GetOatChecksum(); 1127 } else { 1128 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1129 image_space->GetImageLocation().c_str(), instruction_set)); 1130 image_oat_checksum = image_header->GetOatChecksum(); 1131 } 1132 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1133} 1134 1135bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1136 const InstructionSet instruction_set, 1137 std::string* error_msg) { 1138 Runtime* runtime = Runtime::Current(); 1139 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1140 if (image_space == nullptr) { 1141 *error_msg = "No image space for verification against"; 1142 return false; 1143 } 1144 1145 // If the requested instruction set is the same as the current runtime, 1146 // we can use the checksums directly. If it isn't, we'll have to read the 1147 // image header from the image for the right instruction set. 1148 uint32_t image_oat_checksum = 0; 1149 uintptr_t image_oat_data_begin = 0; 1150 int32_t image_patch_delta = 0; 1151 if (instruction_set == runtime->GetInstructionSet()) { 1152 const ImageHeader& image_header = image_space->GetImageHeader(); 1153 image_oat_checksum = image_header.GetOatChecksum(); 1154 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1155 image_patch_delta = image_header.GetPatchDelta(); 1156 } else { 1157 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1158 image_space->GetImageLocation().c_str(), instruction_set)); 1159 image_oat_checksum = image_header->GetOatChecksum(); 1160 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1161 image_patch_delta = image_header->GetPatchDelta(); 1162 } 1163 const OatHeader& oat_header = oat_file->GetOatHeader(); 1164 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1165 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1166 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1167 if (!ret) { 1168 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1169 oat_file->GetLocation().c_str(), 1170 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1171 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1172 oat_file->GetOatHeader().GetImagePatchDelta(), 1173 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1174 } 1175 return ret; 1176} 1177 1178bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1179 const char* dex_location, 1180 uint32_t dex_location_checksum, 1181 const InstructionSet instruction_set, 1182 std::string* error_msg) { 1183 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1184 return false; 1185 } 1186 1187 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1188 &dex_location_checksum); 1189 if (oat_dex_file == nullptr) { 1190 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1191 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1192 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1193 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1194 oat_file->GetLocation().c_str(), 1195 oat_dex_file->GetDexFileLocation().c_str(), 1196 oat_dex_file->GetDexFileLocationChecksum()); 1197 } 1198 return false; 1199 } 1200 1201 DCHECK_EQ(dex_location_checksum, oat_dex_file->GetDexFileLocationChecksum()); 1202 return true; 1203} 1204 1205bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1206 const char* dex_location, 1207 const uint32_t* dex_location_checksum, 1208 std::string* error_msg) { 1209 CHECK(oat_file != nullptr); 1210 CHECK(dex_location != nullptr); 1211 std::unique_ptr<const DexFile> dex_file; 1212 if (dex_location_checksum == nullptr) { 1213 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1214 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1215 // directory. 1216 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1217 if (oat_dex_file == nullptr) { 1218 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1219 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1220 error_msg->c_str()); 1221 return false; 1222 } 1223 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1224 } else { 1225 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1226 kRuntimeISA, error_msg); 1227 if (!verified) { 1228 return false; 1229 } 1230 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1231 dex_location_checksum)->OpenDexFile(error_msg)); 1232 } 1233 return dex_file.get() != nullptr; 1234} 1235 1236const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1237 const char* dex_location, 1238 const uint32_t* dex_location_checksum, 1239 InstructionSet isa, 1240 std::vector<std::string>* error_msgs, 1241 bool* obsolete_file_cleanup_failed) { 1242 *obsolete_file_cleanup_failed = false; 1243 bool already_opened = false; 1244 std::string dex_location_str(dex_location); 1245 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1246 &already_opened, 1247 obsolete_file_cleanup_failed, 1248 error_msgs)); 1249 std::string error_msg; 1250 if (oat_file.get() == nullptr) { 1251 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1252 dex_location)); 1253 return nullptr; 1254 } else if (oat_file->IsExecutable() && 1255 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1256 dex_location_checksum, &error_msg)) { 1257 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1258 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1259 error_msg.c_str())); 1260 return nullptr; 1261 } else if (!oat_file->IsExecutable() && 1262 Runtime::Current()->GetHeap()->HasImageSpace() && 1263 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1264 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1265 "dex location '%s'. Image checksum incorrect.", 1266 oat_file->GetLocation().c_str(), dex_location)); 1267 return nullptr; 1268 } else { 1269 return oat_file.release(); 1270 } 1271} 1272 1273const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1274 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1275 for (size_t i = 0; i < oat_files_.size(); i++) { 1276 const OatFile* oat_file = oat_files_[i]; 1277 DCHECK(oat_file != nullptr); 1278 if (oat_file->GetLocation() == oat_location) { 1279 return oat_file; 1280 } 1281 } 1282 return nullptr; 1283} 1284 1285const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1286 InstructionSet isa, 1287 bool *already_opened, 1288 bool *obsolete_file_cleanup_failed, 1289 std::vector<std::string>* error_msgs) { 1290 // Find out if we've already opened the file 1291 const OatFile* ret = nullptr; 1292 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1293 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1294 if (ret != nullptr) { 1295 *already_opened = true; 1296 return ret; 1297 } 1298 1299 std::string dalvik_cache; 1300 bool have_android_data = false; 1301 bool have_dalvik_cache = false; 1302 bool is_global_cache = false; 1303 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1304 &have_android_data, &have_dalvik_cache, &is_global_cache); 1305 std::string cache_filename; 1306 if (have_dalvik_cache) { 1307 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1308 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1309 if (ret != nullptr) { 1310 *already_opened = true; 1311 return ret; 1312 } 1313 } else { 1314 // If we need to relocate we should just place odex back where it started. 1315 cache_filename = odex_filename; 1316 } 1317 1318 ret = nullptr; 1319 1320 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1321 // 1322 // Now we do the following: 1323 // 1) Try and open the odex version 1324 // 2) If present, checksum-verified & relocated correctly return it 1325 // 3) Close the odex version to free up its address space. 1326 // 4) Try and open the cache version 1327 // 5) If present, checksum-verified & relocated correctly return it 1328 // 6) Close the cache version to free up its address space. 1329 // 7) If we should relocate: 1330 // a) If we have opened and checksum-verified the odex version relocate it to 1331 // 'cache_filename' and return it 1332 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1333 // it. This should not happen often (I think only the run-test's will hit this case). 1334 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1335 // this point. 1336 // 9) Return nullptr 1337 1338 *already_opened = false; 1339 const Runtime* runtime = Runtime::Current(); 1340 CHECK(runtime != nullptr); 1341 bool executable = !runtime->IsCompiler(); 1342 1343 std::string odex_error_msg; 1344 bool should_patch_system = false; 1345 bool odex_checksum_verified = false; 1346 bool have_system_odex = false; 1347 { 1348 // There is a high probability that these both these oat files map similar/the same address 1349 // spaces so we must scope them like this so they each gets its turn. 1350 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1351 executable, &odex_error_msg)); 1352 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1353 &odex_checksum_verified, 1354 &odex_error_msg)) { 1355 return odex_oat_file.release(); 1356 } else { 1357 if (odex_checksum_verified) { 1358 // We can just relocate 1359 should_patch_system = true; 1360 odex_error_msg = "Image Patches are incorrect"; 1361 } 1362 if (odex_oat_file.get() != nullptr) { 1363 have_system_odex = true; 1364 } 1365 } 1366 } 1367 1368 std::string cache_error_msg; 1369 bool should_patch_cache = false; 1370 bool cache_checksum_verified = false; 1371 if (have_dalvik_cache) { 1372 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1373 executable, &cache_error_msg)); 1374 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1375 &cache_checksum_verified, 1376 &cache_error_msg)) { 1377 return cache_oat_file.release(); 1378 } else if (cache_checksum_verified) { 1379 // We can just relocate 1380 should_patch_cache = true; 1381 cache_error_msg = "Image Patches are incorrect"; 1382 } 1383 } else if (have_android_data) { 1384 // dalvik_cache does not exist but android data does. This means we should be able to create 1385 // it, so we should try. 1386 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1387 } 1388 1389 ret = nullptr; 1390 std::string error_msg; 1391 if (runtime->CanRelocate()) { 1392 // Run relocation 1393 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1394 if (space != nullptr) { 1395 const std::string& image_location = space->GetImageLocation(); 1396 if (odex_checksum_verified && should_patch_system) { 1397 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1398 } else if (cache_checksum_verified && should_patch_cache) { 1399 CHECK(have_dalvik_cache); 1400 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1401 } 1402 } else if (have_system_odex) { 1403 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1404 } 1405 } 1406 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1407 // implicitly: were able to fine where the cached version is but we were unable to use it, 1408 // either as a destination for relocation or to open a file. We should delete it if it is 1409 // there. 1410 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1411 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1412 "searching for dex file %s: %s", 1413 cache_filename.c_str(), dex_location.c_str(), 1414 strerror(errno)); 1415 error_msgs->push_back(rm_error_msg); 1416 VLOG(class_linker) << rm_error_msg; 1417 // Let the caller know that we couldn't remove the obsolete file. 1418 // This is a good indication that further writes may fail as well. 1419 *obsolete_file_cleanup_failed = true; 1420 } 1421 } 1422 if (ret == nullptr) { 1423 VLOG(class_linker) << error_msg; 1424 error_msgs->push_back(error_msg); 1425 std::string relocation_msg; 1426 if (runtime->CanRelocate()) { 1427 relocation_msg = StringPrintf(" and relocation failed"); 1428 } 1429 if (have_dalvik_cache && cache_checksum_verified) { 1430 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1431 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1432 cache_filename.c_str(), cache_error_msg.c_str(), 1433 relocation_msg.c_str()); 1434 } else { 1435 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1436 "dalvik_cache availible)%s.", odex_filename.c_str(), 1437 odex_error_msg.c_str(), relocation_msg.c_str()); 1438 } 1439 VLOG(class_linker) << error_msg; 1440 error_msgs->push_back(error_msg); 1441 } 1442 return ret; 1443} 1444 1445const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1446 InstructionSet isa, 1447 std::string* error_msg) { 1448 // We open it non-executable 1449 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1450 if (output.get() == nullptr) { 1451 return nullptr; 1452 } 1453 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1454 VerifyOatImageChecksum(output.get(), isa)) { 1455 return output.release(); 1456 } else { 1457 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1458 oat_path.c_str()); 1459 return nullptr; 1460 } 1461} 1462 1463const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1464 const std::string& output_oat, 1465 const std::string& image_location, 1466 InstructionSet isa, 1467 std::string* error_msg) { 1468 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1469 // We don't have an image space so there is no point in trying to patchoat. 1470 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1471 << "running without an image. Attempting to use oat file for interpretation."; 1472 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1473 } 1474 if (!Runtime::Current()->IsDex2OatEnabled()) { 1475 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1476 // input_oat but make sure we only do interpretation on it's dex files. 1477 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1478 << "disabled. Attempting to use oat file for interpretation"; 1479 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1480 } 1481 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1482 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1483 1484 std::string isa_arg("--instruction-set="); 1485 isa_arg += GetInstructionSetString(isa); 1486 std::string input_oat_filename_arg("--input-oat-file="); 1487 input_oat_filename_arg += input_oat; 1488 std::string output_oat_filename_arg("--output-oat-file="); 1489 output_oat_filename_arg += output_oat; 1490 std::string patched_image_arg("--patched-image-location="); 1491 patched_image_arg += image_location; 1492 1493 std::vector<std::string> argv; 1494 argv.push_back(patchoat); 1495 argv.push_back(isa_arg); 1496 argv.push_back(input_oat_filename_arg); 1497 argv.push_back(output_oat_filename_arg); 1498 argv.push_back(patched_image_arg); 1499 1500 std::string command_line(Join(argv, ' ')); 1501 LOG(INFO) << "Relocate Oat File: " << command_line; 1502 bool success = Exec(argv, error_msg); 1503 if (success) { 1504 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1505 !Runtime::Current()->IsCompiler(), error_msg)); 1506 bool checksum_verified = false; 1507 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1508 return output.release(); 1509 } else if (output.get() != nullptr) { 1510 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1511 "but output file '%s' failed verifcation: %s", 1512 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1513 } else { 1514 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1515 "but was unable to open output file '%s': %s", 1516 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1517 } 1518 } else if (!Runtime::Current()->IsCompiler()) { 1519 // patchoat failed which means we probably don't have enough room to place the output oat file, 1520 // instead of failing we should just run the interpreter from the dex files in the input oat. 1521 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1522 << "for interpretation. patchoat failure was: " << *error_msg; 1523 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1524 } else { 1525 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1526 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1527 error_msg->c_str()); 1528 } 1529 return nullptr; 1530} 1531 1532int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1533 Runtime* runtime = Runtime::Current(); 1534 int32_t real_patch_delta; 1535 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1536 CHECK(image_space != nullptr); 1537 if (isa == Runtime::Current()->GetInstructionSet()) { 1538 const ImageHeader& image_header = image_space->GetImageHeader(); 1539 real_patch_delta = image_header.GetPatchDelta(); 1540 } else { 1541 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1542 image_space->GetImageLocation().c_str(), isa)); 1543 real_patch_delta = image_header->GetPatchDelta(); 1544 } 1545 const OatHeader& oat_header = oat_file->GetOatHeader(); 1546 return real_patch_delta - oat_header.GetImagePatchDelta(); 1547} 1548 1549bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1550 bool* checksum_verified, 1551 std::string* error_msg) { 1552 Runtime* runtime = Runtime::Current(); 1553 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1554 if (image_space == nullptr) { 1555 *error_msg = "No image space present"; 1556 return false; 1557 } 1558 uint32_t real_image_checksum; 1559 void* real_image_oat_offset; 1560 int32_t real_patch_delta; 1561 if (isa == runtime->GetInstructionSet()) { 1562 const ImageHeader& image_header = image_space->GetImageHeader(); 1563 real_image_checksum = image_header.GetOatChecksum(); 1564 real_image_oat_offset = image_header.GetOatDataBegin(); 1565 real_patch_delta = image_header.GetPatchDelta(); 1566 } else { 1567 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1568 image_space->GetImageLocation().c_str(), isa)); 1569 real_image_checksum = image_header->GetOatChecksum(); 1570 real_image_oat_offset = image_header->GetOatDataBegin(); 1571 real_patch_delta = image_header->GetPatchDelta(); 1572 } 1573 1574 const OatHeader& oat_header = oat_file->GetOatHeader(); 1575 std::string compound_msg; 1576 1577 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1578 *checksum_verified = oat_image_checksum == real_image_checksum; 1579 if (!*checksum_verified) { 1580 StringAppendF(&compound_msg, " Oat Image Checksum Incorrect (expected 0x%x, received 0x%x)", 1581 real_image_checksum, oat_image_checksum); 1582 } 1583 1584 void* oat_image_oat_offset = 1585 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1586 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1587 if (!offset_verified) { 1588 StringAppendF(&compound_msg, " Oat Image oat offset incorrect (expected 0x%p, received 0x%p)", 1589 real_image_oat_offset, oat_image_oat_offset); 1590 } 1591 1592 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1593 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1594 if (!patch_delta_verified) { 1595 StringAppendF(&compound_msg, " Oat image patch delta incorrect (expected 0x%x, received 0x%x)", 1596 real_patch_delta, oat_patch_delta); 1597 } 1598 1599 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1600 if (!ret) { 1601 *error_msg = "Oat file failed to verify:" + compound_msg; 1602 } 1603 return ret; 1604} 1605 1606const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1607 std::string* error_msg) { 1608 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1609 if (oat_file != nullptr) { 1610 return oat_file; 1611 } 1612 1613 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1614 error_msg); 1615} 1616 1617static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1618 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1619 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1620 1621 DCHECK(obj != nullptr); 1622 DCHECK(class_linker != nullptr); 1623 1624 if (obj->IsArtMethod()) { 1625 mirror::ArtMethod* method = obj->AsArtMethod(); 1626 if (!method->IsNative()) { 1627 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 1628 if (method != Runtime::Current()->GetResolutionMethod()) { 1629 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1630 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1631 } 1632 } 1633 } 1634} 1635 1636void ClassLinker::InitFromImage() { 1637 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1638 CHECK(!init_done_); 1639 1640 Thread* self = Thread::Current(); 1641 gc::Heap* heap = Runtime::Current()->GetHeap(); 1642 gc::space::ImageSpace* space = heap->GetImageSpace(); 1643 dex_cache_image_class_lookup_required_ = true; 1644 CHECK(space != nullptr); 1645 OatFile& oat_file = GetImageOatFile(space); 1646 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1647 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1648 const char* image_file_location = oat_file.GetOatHeader(). 1649 GetStoreValueByKey(OatHeader::kImageLocationKey); 1650 CHECK(image_file_location == nullptr || *image_file_location == 0); 1651 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1652 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1653 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1654 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1655 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1656 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1657 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1658 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1659 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1660 1661 StackHandleScope<1> hs(self); 1662 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1663 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1664 AsObjectArray<mirror::Class>())); 1665 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1666 1667 // Special case of setting up the String class early so that we can test arbitrary objects 1668 // as being Strings or not 1669 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1670 1671 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1672 static_cast<uint32_t>(dex_caches->GetLength())); 1673 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1674 StackHandleScope<1> hs(self); 1675 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1676 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1677 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1678 nullptr); 1679 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1680 std::string error_msg; 1681 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1682 if (dex_file == nullptr) { 1683 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1684 << " from within oat file " << oat_file.GetLocation() 1685 << " error '" << error_msg << "'"; 1686 } 1687 1688 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1689 1690 AppendToBootClassPath(*dex_file, dex_cache); 1691 } 1692 1693 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1694 // bitmap walk. 1695 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1696 1697 // Set entry point to interpreter if in InterpretOnly mode. 1698 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1699 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1700 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1701 } 1702 1703 // reinit class_roots_ 1704 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1705 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1706 1707 // reinit array_iftable_ from any array class instance, they should be == 1708 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1709 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1710 // String class root was set above 1711 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1712 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1713 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1714 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1715 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1716 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1717 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1718 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1719 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1720 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1721 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1722 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1723 1724 FinishInit(self); 1725 1726 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1727} 1728 1729void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1730 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1731 if ((flags & kVisitRootFlagAllRoots) != 0) { 1732 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1733 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1734 } 1735 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1736 for (auto& pair : new_class_roots_) { 1737 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1738 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1739 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1740 if (UNLIKELY(new_ref != old_ref)) { 1741 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1742 // corresponding object. This is slow, but luckily for us, this may only happen with a 1743 // concurrent moving GC. 1744 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1745 it != end && it->first == pair.first; ++it) { 1746 // If the class stored matches the old class, update it to the new value. 1747 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1748 it->second = GcRoot<mirror::Class>(new_ref); 1749 } 1750 } 1751 } 1752 } 1753 } 1754 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1755 new_class_roots_.clear(); 1756 } 1757 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1758 log_new_class_table_roots_ = true; 1759 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1760 log_new_class_table_roots_ = false; 1761 } 1762 // We deliberately ignore the class roots in the image since we 1763 // handle image roots by using the MS/CMS rescanning of dirty cards. 1764} 1765 1766// Keep in sync with InitCallback. Anything we visit, we need to 1767// reinit references to when reinitializing a ClassLinker from a 1768// mapped image. 1769void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1770 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1771 Thread* self = Thread::Current(); 1772 { 1773 ReaderMutexLock mu(self, dex_lock_); 1774 if ((flags & kVisitRootFlagAllRoots) != 0) { 1775 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1776 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1777 } 1778 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1779 for (size_t index : new_dex_cache_roots_) { 1780 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1781 } 1782 } 1783 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1784 new_dex_cache_roots_.clear(); 1785 } 1786 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1787 log_new_dex_caches_roots_ = true; 1788 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1789 log_new_dex_caches_roots_ = false; 1790 } 1791 } 1792 VisitClassRoots(callback, arg, flags); 1793 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1794 DCHECK(!array_iftable_.IsNull()); 1795 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1796 if (!find_array_class_cache_[i].IsNull()) { 1797 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1798 } 1799 } 1800} 1801 1802void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1803 if (dex_cache_image_class_lookup_required_) { 1804 MoveImageClassesToClassTable(); 1805 } 1806 // TODO: why isn't this a ReaderMutexLock? 1807 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1808 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1809 mirror::Class* c = it.second.Read(); 1810 if (!visitor(c, arg)) { 1811 return; 1812 } 1813 } 1814} 1815 1816static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1817 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1818 classes->insert(c); 1819 return true; 1820} 1821 1822struct GetClassesVisitorArrayArg { 1823 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1824 int32_t index; 1825 bool success; 1826}; 1827 1828static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1829 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1830 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1831 if (arg->index < (*arg->classes)->GetLength()) { 1832 (*arg->classes)->Set(arg->index, c); 1833 arg->index++; 1834 return true; 1835 } else { 1836 arg->success = false; 1837 return false; 1838 } 1839} 1840 1841void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1842 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1843 // is avoiding duplicates. 1844 if (!kMovingClasses) { 1845 std::set<mirror::Class*> classes; 1846 VisitClasses(GetClassesVisitorSet, &classes); 1847 for (mirror::Class* klass : classes) { 1848 if (!visitor(klass, arg)) { 1849 return; 1850 } 1851 } 1852 } else { 1853 Thread* self = Thread::Current(); 1854 StackHandleScope<1> hs(self); 1855 MutableHandle<mirror::ObjectArray<mirror::Class>> classes = 1856 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1857 GetClassesVisitorArrayArg local_arg; 1858 local_arg.classes = &classes; 1859 local_arg.success = false; 1860 // We size the array assuming classes won't be added to the class table during the visit. 1861 // If this assumption fails we iterate again. 1862 while (!local_arg.success) { 1863 size_t class_table_size; 1864 { 1865 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1866 class_table_size = class_table_.size(); 1867 } 1868 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1869 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1870 classes.Assign( 1871 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1872 CHECK(classes.Get() != nullptr); // OOME. 1873 local_arg.index = 0; 1874 local_arg.success = true; 1875 VisitClasses(GetClassesVisitorArray, &local_arg); 1876 } 1877 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1878 // If the class table shrank during creation of the clases array we expect null elements. If 1879 // the class table grew then the loop repeats. If classes are created after the loop has 1880 // finished then we don't visit. 1881 mirror::Class* klass = classes->Get(i); 1882 if (klass != nullptr && !visitor(klass, arg)) { 1883 return; 1884 } 1885 } 1886 } 1887} 1888 1889ClassLinker::~ClassLinker() { 1890 mirror::Class::ResetClass(); 1891 mirror::String::ResetClass(); 1892 mirror::Reference::ResetClass(); 1893 mirror::ArtField::ResetClass(); 1894 mirror::ArtMethod::ResetClass(); 1895 mirror::BooleanArray::ResetArrayClass(); 1896 mirror::ByteArray::ResetArrayClass(); 1897 mirror::CharArray::ResetArrayClass(); 1898 mirror::DoubleArray::ResetArrayClass(); 1899 mirror::FloatArray::ResetArrayClass(); 1900 mirror::IntArray::ResetArrayClass(); 1901 mirror::LongArray::ResetArrayClass(); 1902 mirror::ShortArray::ResetArrayClass(); 1903 mirror::Throwable::ResetClass(); 1904 mirror::StackTraceElement::ResetClass(); 1905 STLDeleteElements(&boot_class_path_); 1906 STLDeleteElements(&oat_files_); 1907} 1908 1909mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1910 gc::Heap* heap = Runtime::Current()->GetHeap(); 1911 StackHandleScope<16> hs(self); 1912 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1913 Handle<mirror::DexCache> dex_cache( 1914 hs.NewHandle(down_cast<mirror::DexCache*>( 1915 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1916 VoidFunctor())))); 1917 if (dex_cache.Get() == nullptr) { 1918 return nullptr; 1919 } 1920 Handle<mirror::String> 1921 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1922 if (location.Get() == nullptr) { 1923 return nullptr; 1924 } 1925 Handle<mirror::ObjectArray<mirror::String>> 1926 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1927 if (strings.Get() == nullptr) { 1928 return nullptr; 1929 } 1930 Handle<mirror::ObjectArray<mirror::Class>> 1931 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1932 if (types.Get() == nullptr) { 1933 return nullptr; 1934 } 1935 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1936 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1937 if (methods.Get() == nullptr) { 1938 return nullptr; 1939 } 1940 Handle<mirror::ObjectArray<mirror::ArtField>> 1941 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1942 if (fields.Get() == nullptr) { 1943 return nullptr; 1944 } 1945 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1946 fields.Get()); 1947 return dex_cache.Get(); 1948} 1949 1950mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1951 uint32_t class_size) { 1952 DCHECK_GE(class_size, sizeof(mirror::Class)); 1953 gc::Heap* heap = Runtime::Current()->GetHeap(); 1954 mirror::Class::InitializeClassVisitor visitor(class_size); 1955 mirror::Object* k = kMovingClasses ? 1956 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1957 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1958 if (UNLIKELY(k == nullptr)) { 1959 CHECK(self->IsExceptionPending()); // OOME. 1960 return nullptr; 1961 } 1962 return k->AsClass(); 1963} 1964 1965mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1966 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1967} 1968 1969mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1970 return down_cast<mirror::ArtField*>( 1971 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1972} 1973 1974mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1975 return down_cast<mirror::ArtMethod*>( 1976 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1977} 1978 1979mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1980 Thread* self, size_t length) { 1981 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1982 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1983} 1984 1985mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1986 mirror::Class* klass) { 1987 DCHECK(klass != nullptr); 1988 1989 // For temporary classes we must wait for them to be retired. 1990 if (init_done_ && klass->IsTemp()) { 1991 CHECK(!klass->IsResolved()); 1992 if (klass->IsErroneous()) { 1993 ThrowEarlierClassFailure(klass); 1994 return nullptr; 1995 } 1996 StackHandleScope<1> hs(self); 1997 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1998 ObjectLock<mirror::Class> lock(self, h_class); 1999 // Loop and wait for the resolving thread to retire this class. 2000 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 2001 lock.WaitIgnoringInterrupts(); 2002 } 2003 if (h_class->IsErroneous()) { 2004 ThrowEarlierClassFailure(h_class.Get()); 2005 return nullptr; 2006 } 2007 CHECK(h_class->IsRetired()); 2008 // Get the updated class from class table. 2009 klass = LookupClass(self, descriptor, h_class.Get()->GetClassLoader()); 2010 } 2011 2012 // Wait for the class if it has not already been linked. 2013 if (!klass->IsResolved() && !klass->IsErroneous()) { 2014 StackHandleScope<1> hs(self); 2015 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 2016 ObjectLock<mirror::Class> lock(self, h_class); 2017 // Check for circular dependencies between classes. 2018 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 2019 ThrowClassCircularityError(h_class.Get()); 2020 h_class->SetStatus(mirror::Class::kStatusError, self); 2021 return nullptr; 2022 } 2023 // Wait for the pending initialization to complete. 2024 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2025 lock.WaitIgnoringInterrupts(); 2026 } 2027 } 2028 2029 if (klass->IsErroneous()) { 2030 ThrowEarlierClassFailure(klass); 2031 return nullptr; 2032 } 2033 // Return the loaded class. No exceptions should be pending. 2034 CHECK(klass->IsResolved()) << PrettyClass(klass); 2035 self->AssertNoPendingException(); 2036 return klass; 2037} 2038 2039typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2040 2041// Search a collection of DexFiles for a descriptor 2042ClassPathEntry FindInClassPath(const char* descriptor, 2043 const std::vector<const DexFile*>& class_path) { 2044 for (size_t i = 0; i != class_path.size(); ++i) { 2045 const DexFile* dex_file = class_path[i]; 2046 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2047 if (dex_class_def != nullptr) { 2048 return ClassPathEntry(dex_file, dex_class_def); 2049 } 2050 } 2051 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 2052 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2053 static_cast<const DexFile::ClassDef*>(nullptr)); 2054} 2055 2056mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2057 Thread* self, const char* descriptor, 2058 Handle<mirror::ClassLoader> class_loader) { 2059 if (class_loader->GetClass() != 2060 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2061 class_loader->GetParent()->GetClass() != 2062 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2063 return nullptr; 2064 } 2065 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2066 // Check if this would be found in the parent boot class loader. 2067 if (pair.second != nullptr) { 2068 mirror::Class* klass = LookupClass(self, descriptor, nullptr); 2069 if (klass != nullptr) { 2070 return EnsureResolved(self, descriptor, klass); 2071 } 2072 klass = DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2073 *pair.second); 2074 if (klass != nullptr) { 2075 return klass; 2076 } 2077 CHECK(self->IsExceptionPending()) << descriptor; 2078 self->ClearException(); 2079 } else { 2080 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2081 StackHandleScope<3> hs(self); 2082 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2083 // We need to get the DexPathList and loop through it. 2084 Handle<mirror::ArtField> cookie_field = 2085 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2086 Handle<mirror::ArtField> dex_file_field = 2087 hs.NewHandle( 2088 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile)); 2089 mirror::Object* dex_path_list = 2090 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2091 GetObject(class_loader.Get()); 2092 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2093 cookie_field.Get() != nullptr) { 2094 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2095 mirror::Object* dex_elements_obj = 2096 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2097 GetObject(dex_path_list); 2098 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2099 // at the mCookie which is a DexFile vector. 2100 if (dex_elements_obj != nullptr) { 2101 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2102 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2103 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2104 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2105 if (element == nullptr) { 2106 // Should never happen, fall back to java code to throw a NPE. 2107 break; 2108 } 2109 mirror::Object* dex_file = dex_file_field->GetObject(element); 2110 if (dex_file != nullptr) { 2111 const uint64_t cookie = cookie_field->GetLong(dex_file); 2112 auto* dex_files = 2113 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2114 if (dex_files == nullptr) { 2115 // This should never happen so log a warning. 2116 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2117 break; 2118 } 2119 for (const DexFile* dex_file : *dex_files) { 2120 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2121 if (dex_class_def != nullptr) { 2122 RegisterDexFile(*dex_file); 2123 mirror::Class* klass = 2124 DefineClass(self, descriptor, class_loader, *dex_file, *dex_class_def); 2125 if (klass == nullptr) { 2126 CHECK(self->IsExceptionPending()) << descriptor; 2127 self->ClearException(); 2128 return nullptr; 2129 } 2130 return klass; 2131 } 2132 } 2133 } 2134 } 2135 } 2136 } 2137 } 2138 return nullptr; 2139} 2140 2141mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2142 Handle<mirror::ClassLoader> class_loader) { 2143 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2144 DCHECK(self != nullptr); 2145 self->AssertNoPendingException(); 2146 if (descriptor[1] == '\0') { 2147 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2148 // for primitive classes that aren't backed by dex files. 2149 return FindPrimitiveClass(descriptor[0]); 2150 } 2151 // Find the class in the loaded classes table. 2152 mirror::Class* klass = LookupClass(self, descriptor, class_loader.Get()); 2153 if (klass != nullptr) { 2154 return EnsureResolved(self, descriptor, klass); 2155 } 2156 // Class is not yet loaded. 2157 if (descriptor[0] == '[') { 2158 return CreateArrayClass(self, descriptor, class_loader); 2159 } else if (class_loader.Get() == nullptr) { 2160 // The boot class loader, search the boot class path. 2161 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2162 if (pair.second != nullptr) { 2163 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2164 *pair.second); 2165 } else { 2166 // The boot class loader is searched ahead of the application class loader, failures are 2167 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2168 // trigger the chaining with a proper stack trace. 2169 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2170 self->SetException(ThrowLocation(), pre_allocated); 2171 return nullptr; 2172 } 2173 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2174 // First try with the bootstrap class loader. 2175 if (class_loader.Get() != nullptr) { 2176 klass = LookupClass(self, descriptor, nullptr); 2177 if (klass != nullptr) { 2178 return EnsureResolved(self, descriptor, klass); 2179 } 2180 } 2181 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2182 // a NoClassDefFoundError being allocated. 2183 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2184 if (pair.second != nullptr) { 2185 return DefineClass(self, descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2186 *pair.second); 2187 } 2188 // Next try the compile time class path. 2189 const std::vector<const DexFile*>* class_path; 2190 { 2191 ScopedObjectAccessUnchecked soa(self); 2192 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2193 soa.AddLocalReference<jobject>(class_loader.Get())); 2194 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2195 } 2196 pair = FindInClassPath(descriptor, *class_path); 2197 if (pair.second != nullptr) { 2198 return DefineClass(self, descriptor, class_loader, *pair.first, *pair.second); 2199 } else { 2200 // Use the pre-allocated NCDFE at compile time to avoid wasting time constructing exceptions. 2201 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2202 self->SetException(ThrowLocation(), pre_allocated); 2203 return nullptr; 2204 } 2205 } else { 2206 ScopedObjectAccessUnchecked soa(self); 2207 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2208 if (klass != nullptr) { 2209 return klass; 2210 } 2211 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2212 soa.AddLocalReference<jobject>(class_loader.Get())); 2213 std::string class_name_string(DescriptorToDot(descriptor)); 2214 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2215 { 2216 ScopedThreadStateChange tsc(self, kNative); 2217 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2218 soa.Env()->NewStringUTF(class_name_string.c_str())); 2219 if (class_name_object.get() == nullptr) { 2220 DCHECK(self->IsExceptionPending()); // OOME. 2221 return nullptr; 2222 } 2223 CHECK(class_loader_object.get() != nullptr); 2224 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2225 WellKnownClasses::java_lang_ClassLoader_loadClass, 2226 class_name_object.get())); 2227 } 2228 if (self->IsExceptionPending()) { 2229 // If the ClassLoader threw, pass that exception up. 2230 return nullptr; 2231 } else if (result.get() == nullptr) { 2232 // broken loader - throw NPE to be compatible with Dalvik 2233 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2234 class_name_string.c_str()).c_str()); 2235 return nullptr; 2236 } else { 2237 // success, return mirror::Class* 2238 return soa.Decode<mirror::Class*>(result.get()); 2239 } 2240 } 2241 UNREACHABLE(); 2242} 2243 2244mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, 2245 Handle<mirror::ClassLoader> class_loader, 2246 const DexFile& dex_file, 2247 const DexFile::ClassDef& dex_class_def) { 2248 StackHandleScope<3> hs(self); 2249 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2250 bool should_allocate = false; 2251 2252 // Load the class from the dex file. 2253 if (UNLIKELY(!init_done_)) { 2254 // finish up init of hand crafted class_roots_ 2255 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2256 klass.Assign(GetClassRoot(kJavaLangObject)); 2257 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2258 klass.Assign(GetClassRoot(kJavaLangClass)); 2259 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2260 klass.Assign(GetClassRoot(kJavaLangString)); 2261 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2262 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2263 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2264 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2265 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2266 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2267 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2268 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2269 } else { 2270 should_allocate = true; 2271 } 2272 } else { 2273 should_allocate = true; 2274 } 2275 2276 if (should_allocate) { 2277 // Allocate a class with the status of not ready. 2278 // Interface object should get the right size here. Regular class will 2279 // figure out the right size later and be replaced with one of the right 2280 // size when the class becomes resolved. 2281 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2282 } 2283 if (UNLIKELY(klass.Get() == nullptr)) { 2284 CHECK(self->IsExceptionPending()); // Expect an OOME. 2285 return nullptr; 2286 } 2287 klass->SetDexCache(FindDexCache(dex_file)); 2288 LoadClass(self, dex_file, dex_class_def, klass, class_loader.Get()); 2289 ObjectLock<mirror::Class> lock(self, klass); 2290 if (self->IsExceptionPending()) { 2291 // An exception occured during load, set status to erroneous while holding klass' lock in case 2292 // notification is necessary. 2293 if (!klass->IsErroneous()) { 2294 klass->SetStatus(mirror::Class::kStatusError, self); 2295 } 2296 return nullptr; 2297 } 2298 klass->SetClinitThreadId(self->GetTid()); 2299 2300 // Add the newly loaded class to the loaded classes table. 2301 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2302 if (existing != nullptr) { 2303 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2304 // this thread to block. 2305 return EnsureResolved(self, descriptor, existing); 2306 } 2307 2308 // Finish loading (if necessary) by finding parents 2309 CHECK(!klass->IsLoaded()); 2310 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2311 // Loading failed. 2312 if (!klass->IsErroneous()) { 2313 klass->SetStatus(mirror::Class::kStatusError, self); 2314 } 2315 return nullptr; 2316 } 2317 CHECK(klass->IsLoaded()); 2318 // Link the class (if necessary) 2319 CHECK(!klass->IsResolved()); 2320 // TODO: Use fast jobjects? 2321 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2322 2323 mirror::Class* new_class = nullptr; 2324 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2325 // Linking failed. 2326 if (!klass->IsErroneous()) { 2327 klass->SetStatus(mirror::Class::kStatusError, self); 2328 } 2329 return nullptr; 2330 } 2331 self->AssertNoPendingException(); 2332 CHECK(new_class != nullptr) << descriptor; 2333 CHECK(new_class->IsResolved()) << descriptor; 2334 2335 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2336 2337 /* 2338 * We send CLASS_PREPARE events to the debugger from here. The 2339 * definition of "preparation" is creating the static fields for a 2340 * class and initializing them to the standard default values, but not 2341 * executing any code (that comes later, during "initialization"). 2342 * 2343 * We did the static preparation in LinkClass. 2344 * 2345 * The class has been prepared and resolved but possibly not yet verified 2346 * at this point. 2347 */ 2348 Dbg::PostClassPrepare(new_class_h.Get()); 2349 2350 return new_class_h.Get(); 2351} 2352 2353uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2354 const DexFile::ClassDef& dex_class_def) { 2355 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2356 size_t num_ref = 0; 2357 size_t num_8 = 0; 2358 size_t num_16 = 0; 2359 size_t num_32 = 0; 2360 size_t num_64 = 0; 2361 if (class_data != nullptr) { 2362 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2363 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2364 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2365 char c = descriptor[0]; 2366 switch (c) { 2367 case 'L': 2368 case '[': 2369 num_ref++; 2370 break; 2371 case 'J': 2372 case 'D': 2373 num_64++; 2374 break; 2375 case 'I': 2376 case 'F': 2377 num_32++; 2378 break; 2379 case 'S': 2380 case 'C': 2381 num_16++; 2382 break; 2383 case 'B': 2384 case 'Z': 2385 num_8++; 2386 break; 2387 default: 2388 LOG(FATAL) << "Unknown descriptor: " << c; 2389 } 2390 } 2391 } 2392 return mirror::Class::ComputeClassSize(false, 0, num_8, num_16, num_32, num_64, num_ref); 2393} 2394 2395OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2396 bool* found) { 2397 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2398 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2399 if (oat_dex_file == nullptr) { 2400 *found = false; 2401 return OatFile::OatClass::Invalid(); 2402 } 2403 *found = true; 2404 return oat_dex_file->GetOatClass(class_def_idx); 2405} 2406 2407static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2408 uint32_t method_idx) { 2409 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2410 const uint8_t* class_data = dex_file.GetClassData(class_def); 2411 CHECK(class_data != nullptr); 2412 ClassDataItemIterator it(dex_file, class_data); 2413 // Skip fields 2414 while (it.HasNextStaticField()) { 2415 it.Next(); 2416 } 2417 while (it.HasNextInstanceField()) { 2418 it.Next(); 2419 } 2420 // Process methods 2421 size_t class_def_method_index = 0; 2422 while (it.HasNextDirectMethod()) { 2423 if (it.GetMemberIndex() == method_idx) { 2424 return class_def_method_index; 2425 } 2426 class_def_method_index++; 2427 it.Next(); 2428 } 2429 while (it.HasNextVirtualMethod()) { 2430 if (it.GetMemberIndex() == method_idx) { 2431 return class_def_method_index; 2432 } 2433 class_def_method_index++; 2434 it.Next(); 2435 } 2436 DCHECK(!it.HasNext()); 2437 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2438 return 0; 2439} 2440 2441const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2442 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2443 // method for direct methods (or virtual methods made direct). 2444 mirror::Class* declaring_class = method->GetDeclaringClass(); 2445 size_t oat_method_index; 2446 if (method->IsStatic() || method->IsDirect()) { 2447 // Simple case where the oat method index was stashed at load time. 2448 oat_method_index = method->GetMethodIndex(); 2449 } else { 2450 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2451 // by search for its position in the declared virtual methods. 2452 oat_method_index = declaring_class->NumDirectMethods(); 2453 size_t end = declaring_class->NumVirtualMethods(); 2454 bool found = false; 2455 for (size_t i = 0; i < end; i++) { 2456 // Check method index instead of identity in case of duplicate method definitions. 2457 if (method->GetDexMethodIndex() == 2458 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2459 found = true; 2460 break; 2461 } 2462 oat_method_index++; 2463 } 2464 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2465 } 2466 DCHECK_EQ(oat_method_index, 2467 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2468 method->GetDeclaringClass()->GetDexClassDefIndex(), 2469 method->GetDexMethodIndex())); 2470 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2471 declaring_class->GetDexClassDefIndex(), 2472 found); 2473 if (!found) { 2474 return OatFile::OatMethod::Invalid(); 2475 } 2476 *found = true; 2477 return oat_class.GetOatMethod(oat_method_index); 2478} 2479 2480// Special case to get oat code without overwriting a trampoline. 2481const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2482 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2483 if (method->IsProxyMethod()) { 2484 return GetQuickProxyInvokeHandler(); 2485 } 2486 bool found; 2487 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2488 const void* result = nullptr; 2489 if (found) { 2490 result = oat_method.GetQuickCode(); 2491 } 2492 2493 if (result == nullptr) { 2494 if (method->IsNative()) { 2495 // No code and native? Use generic trampoline. 2496 result = GetQuickGenericJniStub(); 2497 } else if (method->IsPortableCompiled()) { 2498 // No code? Do we expect portable code? 2499 result = GetQuickToPortableBridge(); 2500 } else { 2501 // No code? You must mean to go into the interpreter. 2502 result = GetQuickToInterpreterBridge(); 2503 } 2504 } 2505 return result; 2506} 2507 2508const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2509 bool* have_portable_code) { 2510 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2511 *have_portable_code = false; 2512 if (method->IsProxyMethod()) { 2513 return GetPortableProxyInvokeHandler(); 2514 } 2515 bool found; 2516 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2517 const void* result = nullptr; 2518 const void* quick_code = nullptr; 2519 if (found) { 2520 result = oat_method.GetPortableCode(); 2521 quick_code = oat_method.GetQuickCode(); 2522 } 2523 2524 if (result == nullptr) { 2525 if (quick_code == nullptr) { 2526 // No code? You must mean to go into the interpreter. 2527 result = GetPortableToInterpreterBridge(); 2528 } else { 2529 // No code? But there's quick code, so use a bridge. 2530 result = GetPortableToQuickBridge(); 2531 } 2532 } else { 2533 *have_portable_code = true; 2534 } 2535 return result; 2536} 2537 2538const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2539 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2540 return nullptr; 2541 } 2542 bool found; 2543 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2544 return found ? oat_method.GetQuickCode() : nullptr; 2545} 2546 2547const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2548 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2549 return nullptr; 2550 } 2551 bool found; 2552 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2553 return found ? oat_method.GetPortableCode() : nullptr; 2554} 2555 2556const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2557 uint32_t method_idx) { 2558 bool found; 2559 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2560 if (!found) { 2561 return nullptr; 2562 } 2563 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2564 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2565} 2566 2567const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2568 uint32_t method_idx) { 2569 bool found; 2570 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2571 if (!found) { 2572 return nullptr; 2573 } 2574 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2575 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2576} 2577 2578// Returns true if the method must run with interpreter, false otherwise. 2579static bool NeedsInterpreter( 2580 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2581 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2582 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2583 // No code: need interpreter. 2584 // May return true for native code, in the case of generic JNI 2585 // DCHECK(!method->IsNative()); 2586 return true; 2587 } 2588#ifdef ART_SEA_IR_MODE 2589 ScopedObjectAccess soa(Thread::Current()); 2590 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2591 LOG(INFO) << "Found " << PrettyMethod(method); 2592 return false; 2593 } 2594#endif 2595 // If interpreter mode is enabled, every method (except native and proxy) must 2596 // be run with interpreter. 2597 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2598 !method->IsNative() && !method->IsProxyMethod(); 2599} 2600 2601void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2602 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2603 if (klass->NumDirectMethods() == 0) { 2604 return; // No direct methods => no static methods. 2605 } 2606 Runtime* runtime = Runtime::Current(); 2607 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2608 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2609 return; // OAT file unavailable. 2610 } 2611 } 2612 2613 const DexFile& dex_file = klass->GetDexFile(); 2614 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2615 CHECK(dex_class_def != nullptr); 2616 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 2617 // There should always be class data if there were direct methods. 2618 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2619 ClassDataItemIterator it(dex_file, class_data); 2620 // Skip fields 2621 while (it.HasNextStaticField()) { 2622 it.Next(); 2623 } 2624 while (it.HasNextInstanceField()) { 2625 it.Next(); 2626 } 2627 bool has_oat_class; 2628 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2629 &has_oat_class); 2630 // Link the code of methods skipped by LinkCode. 2631 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2632 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2633 if (!method->IsStatic()) { 2634 // Only update static methods. 2635 continue; 2636 } 2637 const void* portable_code = nullptr; 2638 const void* quick_code = nullptr; 2639 if (has_oat_class) { 2640 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2641 portable_code = oat_method.GetPortableCode(); 2642 quick_code = oat_method.GetQuickCode(); 2643 } 2644 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2645 bool have_portable_code = false; 2646 if (enter_interpreter) { 2647 // Use interpreter entry point. 2648 // Check whether the method is native, in which case it's generic JNI. 2649 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2650 quick_code = GetQuickGenericJniStub(); 2651 portable_code = GetPortableToQuickBridge(); 2652 } else { 2653 portable_code = GetPortableToInterpreterBridge(); 2654 quick_code = GetQuickToInterpreterBridge(); 2655 } 2656 } else { 2657 if (portable_code == nullptr) { 2658 portable_code = GetPortableToQuickBridge(); 2659 } else { 2660 have_portable_code = true; 2661 } 2662 if (quick_code == nullptr) { 2663 quick_code = GetQuickToPortableBridge(); 2664 } 2665 } 2666 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2667 have_portable_code); 2668 } 2669 // Ignore virtual methods on the iterator. 2670} 2671 2672void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, 2673 const OatFile::OatClass* oat_class, 2674 const DexFile& dex_file, uint32_t dex_method_index, 2675 uint32_t method_index) { 2676 Runtime* runtime = Runtime::Current(); 2677 if (runtime->IsCompiler()) { 2678 // The following code only applies to a non-compiler runtime. 2679 return; 2680 } 2681 // Method shouldn't have already been linked. 2682 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2683 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2684 if (oat_class != nullptr) { 2685 // Every kind of method should at least get an invoke stub from the oat_method. 2686 // non-abstract methods also get their code pointers. 2687 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2688 oat_method.LinkMethod(method.Get()); 2689 } 2690 2691 // Install entry point from interpreter. 2692 bool enter_interpreter = NeedsInterpreter(method.Get(), 2693 method->GetEntryPointFromQuickCompiledCode(), 2694 method->GetEntryPointFromPortableCompiledCode()); 2695 if (enter_interpreter && !method->IsNative()) { 2696 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 2697 } else { 2698 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2699 } 2700 2701 if (method->IsAbstract()) { 2702 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2703 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2704 return; 2705 } 2706 2707 bool have_portable_code = false; 2708 if (method->IsStatic() && !method->IsConstructor()) { 2709 // For static methods excluding the class initializer, install the trampoline. 2710 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2711 // after initializing class (see ClassLinker::InitializeClass method). 2712 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub()); 2713 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionStub()); 2714 } else if (enter_interpreter) { 2715 if (!method->IsNative()) { 2716 // Set entry point from compiled code if there's no code or in interpreter only mode. 2717 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2718 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2719 } else { 2720 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub()); 2721 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2722 } 2723 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2724 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2725 have_portable_code = true; 2726 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2727 } else { 2728 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2729 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2730 } 2731 2732 if (method->IsNative()) { 2733 // Unregistering restores the dlsym lookup stub. 2734 method->UnregisterNative(); 2735 2736 if (enter_interpreter) { 2737 // We have a native method here without code. Then it should have either the generic JNI 2738 // trampoline as entrypoint (non-static), or the resolution trampoline (static). 2739 // TODO: this doesn't handle all the cases where trampolines may be installed. 2740 const void* entry_point = method->GetEntryPointFromQuickCompiledCode(); 2741 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point)); 2742 } 2743 } 2744 2745 // Allow instrumentation its chance to hijack code. 2746 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2747 method->GetEntryPointFromQuickCompiledCode(), 2748 method->GetEntryPointFromPortableCompiledCode(), 2749 have_portable_code); 2750} 2751 2752 2753 2754void ClassLinker::LoadClass(Thread* self, const DexFile& dex_file, 2755 const DexFile::ClassDef& dex_class_def, 2756 Handle<mirror::Class> klass, 2757 mirror::ClassLoader* class_loader) { 2758 CHECK(klass.Get() != nullptr); 2759 CHECK(klass->GetDexCache() != nullptr); 2760 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2761 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2762 CHECK(descriptor != nullptr); 2763 2764 klass->SetClass(GetClassRoot(kJavaLangClass)); 2765 if (kUseBakerOrBrooksReadBarrier) { 2766 klass->AssertReadBarrierPointer(); 2767 } 2768 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2769 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2770 klass->SetAccessFlags(access_flags); 2771 klass->SetClassLoader(class_loader); 2772 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2773 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2774 2775 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2776 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2777 2778 const uint8_t* class_data = dex_file.GetClassData(dex_class_def); 2779 if (class_data == nullptr) { 2780 return; // no fields or methods - for example a marker interface 2781 } 2782 2783 2784 bool has_oat_class = false; 2785 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2786 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2787 &has_oat_class); 2788 if (has_oat_class) { 2789 LoadClassMembers(self, dex_file, class_data, klass, class_loader, &oat_class); 2790 } 2791 } 2792 if (!has_oat_class) { 2793 LoadClassMembers(self, dex_file, class_data, klass, class_loader, nullptr); 2794 } 2795} 2796 2797void ClassLinker::LoadClassMembers(Thread* self, const DexFile& dex_file, 2798 const uint8_t* class_data, 2799 Handle<mirror::Class> klass, 2800 mirror::ClassLoader* class_loader, 2801 const OatFile::OatClass* oat_class) { 2802 // Load fields. 2803 ClassDataItemIterator it(dex_file, class_data); 2804 if (it.NumStaticFields() != 0) { 2805 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2806 if (UNLIKELY(statics == nullptr)) { 2807 CHECK(self->IsExceptionPending()); // OOME. 2808 return; 2809 } 2810 klass->SetSFields(statics); 2811 } 2812 if (it.NumInstanceFields() != 0) { 2813 mirror::ObjectArray<mirror::ArtField>* fields = 2814 AllocArtFieldArray(self, it.NumInstanceFields()); 2815 if (UNLIKELY(fields == nullptr)) { 2816 CHECK(self->IsExceptionPending()); // OOME. 2817 return; 2818 } 2819 klass->SetIFields(fields); 2820 } 2821 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2822 self->AllowThreadSuspension(); 2823 StackHandleScope<1> hs(self); 2824 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2825 if (UNLIKELY(sfield.Get() == nullptr)) { 2826 CHECK(self->IsExceptionPending()); // OOME. 2827 return; 2828 } 2829 klass->SetStaticField(i, sfield.Get()); 2830 LoadField(dex_file, it, klass, sfield); 2831 } 2832 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2833 self->AllowThreadSuspension(); 2834 StackHandleScope<1> hs(self); 2835 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2836 if (UNLIKELY(ifield.Get() == nullptr)) { 2837 CHECK(self->IsExceptionPending()); // OOME. 2838 return; 2839 } 2840 klass->SetInstanceField(i, ifield.Get()); 2841 LoadField(dex_file, it, klass, ifield); 2842 } 2843 2844 // Load methods. 2845 if (it.NumDirectMethods() != 0) { 2846 // TODO: append direct methods to class object 2847 mirror::ObjectArray<mirror::ArtMethod>* directs = 2848 AllocArtMethodArray(self, it.NumDirectMethods()); 2849 if (UNLIKELY(directs == nullptr)) { 2850 CHECK(self->IsExceptionPending()); // OOME. 2851 return; 2852 } 2853 klass->SetDirectMethods(directs); 2854 } 2855 if (it.NumVirtualMethods() != 0) { 2856 // TODO: append direct methods to class object 2857 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2858 AllocArtMethodArray(self, it.NumVirtualMethods()); 2859 if (UNLIKELY(virtuals == nullptr)) { 2860 CHECK(self->IsExceptionPending()); // OOME. 2861 return; 2862 } 2863 klass->SetVirtualMethods(virtuals); 2864 } 2865 size_t class_def_method_index = 0; 2866 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2867 size_t last_class_def_method_index = 0; 2868 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2869 self->AllowThreadSuspension(); 2870 StackHandleScope<1> hs(self); 2871 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2872 if (UNLIKELY(method.Get() == nullptr)) { 2873 CHECK(self->IsExceptionPending()); // OOME. 2874 return; 2875 } 2876 klass->SetDirectMethod(i, method.Get()); 2877 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2878 uint32_t it_method_index = it.GetMemberIndex(); 2879 if (last_dex_method_index == it_method_index) { 2880 // duplicate case 2881 method->SetMethodIndex(last_class_def_method_index); 2882 } else { 2883 method->SetMethodIndex(class_def_method_index); 2884 last_dex_method_index = it_method_index; 2885 last_class_def_method_index = class_def_method_index; 2886 } 2887 class_def_method_index++; 2888 } 2889 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2890 self->AllowThreadSuspension(); 2891 StackHandleScope<1> hs(self); 2892 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2893 if (UNLIKELY(method.Get() == nullptr)) { 2894 CHECK(self->IsExceptionPending()); // OOME. 2895 return; 2896 } 2897 klass->SetVirtualMethod(i, method.Get()); 2898 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2899 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2900 class_def_method_index++; 2901 } 2902 DCHECK(!it.HasNext()); 2903} 2904 2905void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2906 Handle<mirror::Class> klass, 2907 Handle<mirror::ArtField> dst) { 2908 uint32_t field_idx = it.GetMemberIndex(); 2909 dst->SetDexFieldIndex(field_idx); 2910 dst->SetDeclaringClass(klass.Get()); 2911 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2912} 2913 2914mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2915 const ClassDataItemIterator& it, 2916 Handle<mirror::Class> klass) { 2917 uint32_t dex_method_idx = it.GetMemberIndex(); 2918 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2919 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2920 2921 mirror::ArtMethod* dst = AllocArtMethod(self); 2922 if (UNLIKELY(dst == nullptr)) { 2923 CHECK(self->IsExceptionPending()); // OOME. 2924 return nullptr; 2925 } 2926 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2927 2928 ScopedAssertNoThreadSuspension ants(self, "LoadMethod"); 2929 dst->SetDexMethodIndex(dex_method_idx); 2930 dst->SetDeclaringClass(klass.Get()); 2931 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2932 2933 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2934 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2935 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2936 2937 uint32_t access_flags = it.GetMethodAccessFlags(); 2938 2939 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2940 // Set finalizable flag on declaring class. 2941 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2942 // Void return type. 2943 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2944 klass->SetFinalizable(); 2945 } else { 2946 std::string temp; 2947 const char* klass_descriptor = klass->GetDescriptor(&temp); 2948 // The Enum class declares a "final" finalize() method to prevent subclasses from 2949 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2950 // subclasses, so we exclude it here. 2951 // We also want to avoid setting the flag on Object, where we know that finalize() is 2952 // empty. 2953 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2954 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2955 klass->SetFinalizable(); 2956 } 2957 } 2958 } 2959 } else if (method_name[0] == '<') { 2960 // Fix broken access flags for initializers. Bug 11157540. 2961 bool is_init = (strcmp("<init>", method_name) == 0); 2962 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2963 if (UNLIKELY(!is_init && !is_clinit)) { 2964 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2965 } else { 2966 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2967 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2968 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2969 access_flags |= kAccConstructor; 2970 } 2971 } 2972 } 2973 dst->SetAccessFlags(access_flags); 2974 2975 return dst; 2976} 2977 2978void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) { 2979 StackHandleScope<1> hs(self); 2980 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2981 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2982 << dex_file.GetLocation(); 2983 AppendToBootClassPath(dex_file, dex_cache); 2984} 2985 2986void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2987 Handle<mirror::DexCache> dex_cache) { 2988 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2989 boot_class_path_.push_back(&dex_file); 2990 RegisterDexFile(dex_file, dex_cache); 2991} 2992 2993bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2994 dex_lock_.AssertSharedHeld(Thread::Current()); 2995 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2996 mirror::DexCache* dex_cache = GetDexCache(i); 2997 if (dex_cache->GetDexFile() == &dex_file) { 2998 return true; 2999 } 3000 } 3001 return false; 3002} 3003 3004bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 3005 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3006 return IsDexFileRegisteredLocked(dex_file); 3007} 3008 3009void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 3010 Handle<mirror::DexCache> dex_cache) { 3011 dex_lock_.AssertExclusiveHeld(Thread::Current()); 3012 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 3013 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 3014 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 3015 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 3016 dex_cache->SetDexFile(&dex_file); 3017 if (log_new_dex_caches_roots_) { 3018 // TODO: This is not safe if we can remove dex caches. 3019 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 3020 } 3021} 3022 3023void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 3024 Thread* self = Thread::Current(); 3025 { 3026 ReaderMutexLock mu(self, dex_lock_); 3027 if (IsDexFileRegisteredLocked(dex_file)) { 3028 return; 3029 } 3030 } 3031 // Don't alloc while holding the lock, since allocation may need to 3032 // suspend all threads and another thread may need the dex_lock_ to 3033 // get to a suspend point. 3034 StackHandleScope<1> hs(self); 3035 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3036 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3037 << dex_file.GetLocation(); 3038 { 3039 WriterMutexLock mu(self, dex_lock_); 3040 if (IsDexFileRegisteredLocked(dex_file)) { 3041 return; 3042 } 3043 RegisterDexFileLocked(dex_file, dex_cache); 3044 } 3045} 3046 3047void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3048 Handle<mirror::DexCache> dex_cache) { 3049 WriterMutexLock mu(Thread::Current(), dex_lock_); 3050 RegisterDexFileLocked(dex_file, dex_cache); 3051} 3052 3053mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3054 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3055 // Search assuming unique-ness of dex file. 3056 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3057 mirror::DexCache* dex_cache = GetDexCache(i); 3058 if (dex_cache->GetDexFile() == &dex_file) { 3059 return dex_cache; 3060 } 3061 } 3062 // Search matching by location name. 3063 std::string location(dex_file.GetLocation()); 3064 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3065 mirror::DexCache* dex_cache = GetDexCache(i); 3066 if (dex_cache->GetDexFile()->GetLocation() == location) { 3067 return dex_cache; 3068 } 3069 } 3070 // Failure, dump diagnostic and abort. 3071 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3072 mirror::DexCache* dex_cache = GetDexCache(i); 3073 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3074 } 3075 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3076 return nullptr; 3077} 3078 3079void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3080 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3081 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3082 mirror::DexCache* dex_cache = GetDexCache(i); 3083 dex_cache->Fixup(resolution_method); 3084 } 3085} 3086 3087mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3088 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3089 if (UNLIKELY(klass == nullptr)) { 3090 return nullptr; 3091 } 3092 return InitializePrimitiveClass(klass, type); 3093} 3094 3095mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3096 Primitive::Type type) { 3097 CHECK(primitive_class != nullptr); 3098 // Must hold lock on object when initializing. 3099 Thread* self = Thread::Current(); 3100 StackHandleScope<1> hs(self); 3101 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3102 ObjectLock<mirror::Class> lock(self, h_class); 3103 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3104 primitive_class->SetPrimitiveType(type); 3105 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3106 const char* descriptor = Primitive::Descriptor(type); 3107 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3108 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3109 return primitive_class; 3110} 3111 3112// Create an array class (i.e. the class object for the array, not the 3113// array itself). "descriptor" looks like "[C" or "[[[[B" or 3114// "[Ljava/lang/String;". 3115// 3116// If "descriptor" refers to an array of primitives, look up the 3117// primitive type's internally-generated class object. 3118// 3119// "class_loader" is the class loader of the class that's referring to 3120// us. It's used to ensure that we're looking for the element type in 3121// the right context. It does NOT become the class loader for the 3122// array class; that always comes from the base element class. 3123// 3124// Returns nullptr with an exception raised on failure. 3125mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3126 Handle<mirror::ClassLoader> class_loader) { 3127 // Identify the underlying component type 3128 CHECK_EQ('[', descriptor[0]); 3129 StackHandleScope<2> hs(self); 3130 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, 3131 class_loader))); 3132 if (component_type.Get() == nullptr) { 3133 DCHECK(self->IsExceptionPending()); 3134 // We need to accept erroneous classes as component types. 3135 component_type.Assign(LookupClass(self, descriptor + 1, class_loader.Get())); 3136 if (component_type.Get() == nullptr) { 3137 DCHECK(self->IsExceptionPending()); 3138 return nullptr; 3139 } else { 3140 self->ClearException(); 3141 } 3142 } 3143 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3144 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3145 return nullptr; 3146 } 3147 // See if the component type is already loaded. Array classes are 3148 // always associated with the class loader of their underlying 3149 // element type -- an array of Strings goes with the loader for 3150 // java/lang/String -- so we need to look for it there. (The 3151 // caller should have checked for the existence of the class 3152 // before calling here, but they did so with *their* class loader, 3153 // not the component type's loader.) 3154 // 3155 // If we find it, the caller adds "loader" to the class' initiating 3156 // loader list, which should prevent us from going through this again. 3157 // 3158 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3159 // are the same, because our caller (FindClass) just did the 3160 // lookup. (Even if we get this wrong we still have correct behavior, 3161 // because we effectively do this lookup again when we add the new 3162 // class to the hash table --- necessary because of possible races with 3163 // other threads.) 3164 if (class_loader.Get() != component_type->GetClassLoader()) { 3165 mirror::Class* new_class = LookupClass(self, descriptor, component_type->GetClassLoader()); 3166 if (new_class != nullptr) { 3167 return new_class; 3168 } 3169 } 3170 3171 // Fill out the fields in the Class. 3172 // 3173 // It is possible to execute some methods against arrays, because 3174 // all arrays are subclasses of java_lang_Object_, so we need to set 3175 // up a vtable. We can just point at the one in java_lang_Object_. 3176 // 3177 // Array classes are simple enough that we don't need to do a full 3178 // link step. 3179 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3180 if (UNLIKELY(!init_done_)) { 3181 // Classes that were hand created, ie not by FindSystemClass 3182 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3183 new_class.Assign(GetClassRoot(kClassArrayClass)); 3184 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3185 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3186 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) { 3187 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3188 } else if (strcmp(descriptor, 3189 GetClassRootDescriptor(kJavaLangReflectArtMethodArrayClass)) == 0) { 3190 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3191 } else if (strcmp(descriptor, 3192 GetClassRootDescriptor(kJavaLangReflectArtFieldArrayClass)) == 0) { 3193 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3194 } else if (strcmp(descriptor, "[C") == 0) { 3195 new_class.Assign(GetClassRoot(kCharArrayClass)); 3196 } else if (strcmp(descriptor, "[I") == 0) { 3197 new_class.Assign(GetClassRoot(kIntArrayClass)); 3198 } 3199 } 3200 if (new_class.Get() == nullptr) { 3201 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3202 if (new_class.Get() == nullptr) { 3203 return nullptr; 3204 } 3205 new_class->SetComponentType(component_type.Get()); 3206 } 3207 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3208 DCHECK(new_class->GetComponentType() != nullptr); 3209 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3210 new_class->SetSuperClass(java_lang_Object); 3211 new_class->SetVTable(java_lang_Object->GetVTable()); 3212 new_class->SetPrimitiveType(Primitive::kPrimNot); 3213 new_class->SetClassLoader(component_type->GetClassLoader()); 3214 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3215 { 3216 StackHandleScope<mirror::Class::kImtSize> hs(self, 3217 Runtime::Current()->GetImtUnimplementedMethod()); 3218 new_class->PopulateEmbeddedImtAndVTable(&hs); 3219 } 3220 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3221 // don't need to set new_class->SetObjectSize(..) 3222 // because Object::SizeOf delegates to Array::SizeOf 3223 3224 3225 // All arrays have java/lang/Cloneable and java/io/Serializable as 3226 // interfaces. We need to set that up here, so that stuff like 3227 // "instanceof" works right. 3228 // 3229 // Note: The GC could run during the call to FindSystemClass, 3230 // so we need to make sure the class object is GC-valid while we're in 3231 // there. Do this by clearing the interface list so the GC will just 3232 // think that the entries are null. 3233 3234 3235 // Use the single, global copies of "interfaces" and "iftable" 3236 // (remember not to free them for arrays). 3237 { 3238 mirror::IfTable* array_iftable = array_iftable_.Read(); 3239 CHECK(array_iftable != nullptr); 3240 new_class->SetIfTable(array_iftable); 3241 } 3242 3243 // Inherit access flags from the component type. 3244 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3245 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3246 access_flags &= kAccJavaFlagsMask; 3247 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3248 // and remove "interface". 3249 access_flags |= kAccAbstract | kAccFinal; 3250 access_flags &= ~kAccInterface; 3251 3252 new_class->SetAccessFlags(access_flags); 3253 3254 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3255 if (existing == nullptr) { 3256 return new_class.Get(); 3257 } 3258 // Another thread must have loaded the class after we 3259 // started but before we finished. Abandon what we've 3260 // done. 3261 // 3262 // (Yes, this happens.) 3263 3264 return existing; 3265} 3266 3267mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3268 switch (type) { 3269 case 'B': 3270 return GetClassRoot(kPrimitiveByte); 3271 case 'C': 3272 return GetClassRoot(kPrimitiveChar); 3273 case 'D': 3274 return GetClassRoot(kPrimitiveDouble); 3275 case 'F': 3276 return GetClassRoot(kPrimitiveFloat); 3277 case 'I': 3278 return GetClassRoot(kPrimitiveInt); 3279 case 'J': 3280 return GetClassRoot(kPrimitiveLong); 3281 case 'S': 3282 return GetClassRoot(kPrimitiveShort); 3283 case 'Z': 3284 return GetClassRoot(kPrimitiveBoolean); 3285 case 'V': 3286 return GetClassRoot(kPrimitiveVoid); 3287 default: 3288 break; 3289 } 3290 std::string printable_type(PrintableChar(type)); 3291 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3292 return nullptr; 3293} 3294 3295mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3296 size_t hash) { 3297 if (VLOG_IS_ON(class_linker)) { 3298 mirror::DexCache* dex_cache = klass->GetDexCache(); 3299 std::string source; 3300 if (dex_cache != nullptr) { 3301 source += " from "; 3302 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3303 } 3304 LOG(INFO) << "Loaded class " << descriptor << source; 3305 } 3306 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3307 mirror::Class* existing = 3308 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3309 if (existing != nullptr) { 3310 return existing; 3311 } 3312 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3313 dex_cache_image_class_lookup_required_) { 3314 // Check a class loaded with the system class loader matches one in the image if the class 3315 // is in the image. 3316 existing = LookupClassFromImage(descriptor); 3317 if (existing != nullptr) { 3318 CHECK(klass == existing); 3319 } 3320 } 3321 VerifyObject(klass); 3322 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3323 if (log_new_class_table_roots_) { 3324 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3325 } 3326 return nullptr; 3327} 3328 3329mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3330 size_t hash) { 3331 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3332 mirror::Class* existing = 3333 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3334 3335 if (existing == nullptr) { 3336 CHECK(klass->IsProxyClass()); 3337 return nullptr; 3338 } 3339 3340 CHECK_NE(existing, klass) << descriptor; 3341 CHECK(!existing->IsResolved()) << descriptor; 3342 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3343 3344 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3345 it != end && it->first == hash; ++it) { 3346 mirror::Class* klass = it->second.Read(); 3347 if (klass == existing) { 3348 class_table_.erase(it); 3349 break; 3350 } 3351 } 3352 3353 CHECK(!klass->IsTemp()) << descriptor; 3354 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3355 dex_cache_image_class_lookup_required_) { 3356 // Check a class loaded with the system class loader matches one in the image if the class 3357 // is in the image. 3358 existing = LookupClassFromImage(descriptor); 3359 if (existing != nullptr) { 3360 CHECK(klass == existing) << descriptor; 3361 } 3362 } 3363 VerifyObject(klass); 3364 3365 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3366 if (log_new_class_table_roots_) { 3367 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3368 } 3369 3370 return existing; 3371} 3372 3373bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3374 size_t hash = Hash(descriptor); 3375 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3376 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3377 it != end && it->first == hash; 3378 ++it) { 3379 mirror::Class* klass = it->second.Read(); 3380 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3381 class_table_.erase(it); 3382 return true; 3383 } 3384 } 3385 return false; 3386} 3387 3388mirror::Class* ClassLinker::LookupClass(Thread* self, const char* descriptor, 3389 const mirror::ClassLoader* class_loader) { 3390 size_t hash = Hash(descriptor); 3391 { 3392 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 3393 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3394 if (result != nullptr) { 3395 return result; 3396 } 3397 } 3398 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3399 return nullptr; 3400 } else { 3401 // Lookup failed but need to search dex_caches_. 3402 mirror::Class* result = LookupClassFromImage(descriptor); 3403 if (result != nullptr) { 3404 InsertClass(descriptor, result, hash); 3405 } else { 3406 // Searching the image dex files/caches failed, we don't want to get into this situation 3407 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3408 // classes into the class table. 3409 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3410 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3411 MoveImageClassesToClassTable(); 3412 } 3413 } 3414 return result; 3415 } 3416} 3417 3418mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3419 const mirror::ClassLoader* class_loader, 3420 size_t hash) { 3421 auto end = class_table_.end(); 3422 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3423 mirror::Class* klass = it->second.Read(); 3424 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3425 if (kIsDebugBuild) { 3426 // Check for duplicates in the table. 3427 for (++it; it != end && it->first == hash; ++it) { 3428 mirror::Class* klass2 = it->second.Read(); 3429 CHECK(!(klass2->GetClassLoader() == class_loader && 3430 klass2->DescriptorEquals(descriptor))) 3431 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3432 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3433 } 3434 } 3435 return klass; 3436 } 3437 } 3438 return nullptr; 3439} 3440 3441static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3442 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3443 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3444 CHECK(image != nullptr); 3445 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3446 return root->AsObjectArray<mirror::DexCache>(); 3447} 3448 3449void ClassLinker::MoveImageClassesToClassTable() { 3450 Thread* self = Thread::Current(); 3451 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3452 if (!dex_cache_image_class_lookup_required_) { 3453 return; // All dex cache classes are already in the class table. 3454 } 3455 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table"); 3456 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3457 std::string temp; 3458 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3459 mirror::DexCache* dex_cache = dex_caches->Get(i); 3460 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3461 for (int32_t j = 0; j < types->GetLength(); j++) { 3462 mirror::Class* klass = types->Get(j); 3463 if (klass != nullptr) { 3464 DCHECK(klass->GetClassLoader() == nullptr); 3465 const char* descriptor = klass->GetDescriptor(&temp); 3466 size_t hash = Hash(descriptor); 3467 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3468 if (existing != nullptr) { 3469 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3470 << PrettyClassAndClassLoader(klass); 3471 } else { 3472 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3473 if (log_new_class_table_roots_) { 3474 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3475 } 3476 } 3477 } 3478 } 3479 } 3480 dex_cache_image_class_lookup_required_ = false; 3481} 3482 3483mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3484 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup"); 3485 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3486 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3487 mirror::DexCache* dex_cache = dex_caches->Get(i); 3488 const DexFile* dex_file = dex_cache->GetDexFile(); 3489 // Try binary searching the string/type index. 3490 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3491 if (string_id != nullptr) { 3492 const DexFile::TypeId* type_id = 3493 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3494 if (type_id != nullptr) { 3495 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3496 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3497 if (klass != nullptr) { 3498 return klass; 3499 } 3500 } 3501 } 3502 } 3503 return nullptr; 3504} 3505 3506void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3507 result.clear(); 3508 if (dex_cache_image_class_lookup_required_) { 3509 MoveImageClassesToClassTable(); 3510 } 3511 size_t hash = Hash(descriptor); 3512 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3513 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3514 it != end && it->first == hash; ++it) { 3515 mirror::Class* klass = it->second.Read(); 3516 if (klass->DescriptorEquals(descriptor)) { 3517 result.push_back(klass); 3518 } 3519 } 3520} 3521 3522void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) { 3523 // TODO: assert that the monitor on the Class is held 3524 ObjectLock<mirror::Class> lock(self, klass); 3525 3526 // Don't attempt to re-verify if already sufficiently verified. 3527 if (klass->IsVerified()) { 3528 EnsurePreverifiedMethods(klass); 3529 return; 3530 } 3531 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3532 return; 3533 } 3534 3535 // The class might already be erroneous, for example at compile time if we attempted to verify 3536 // this class as a parent to another. 3537 if (klass->IsErroneous()) { 3538 ThrowEarlierClassFailure(klass.Get()); 3539 return; 3540 } 3541 3542 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3543 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3544 } else { 3545 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3546 << PrettyClass(klass.Get()); 3547 CHECK(!Runtime::Current()->IsCompiler()); 3548 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3549 } 3550 3551 // Skip verification if disabled. 3552 if (!Runtime::Current()->IsVerificationEnabled()) { 3553 klass->SetStatus(mirror::Class::kStatusVerified, self); 3554 EnsurePreverifiedMethods(klass); 3555 return; 3556 } 3557 3558 // Verify super class. 3559 StackHandleScope<2> hs(self); 3560 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3561 if (super.Get() != nullptr) { 3562 // Acquire lock to prevent races on verifying the super class. 3563 ObjectLock<mirror::Class> lock(self, super); 3564 3565 if (!super->IsVerified() && !super->IsErroneous()) { 3566 VerifyClass(self, super); 3567 } 3568 if (!super->IsCompileTimeVerified()) { 3569 std::string error_msg( 3570 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3571 PrettyDescriptor(klass.Get()).c_str(), 3572 PrettyDescriptor(super.Get()).c_str())); 3573 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3574 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3575 if (cause.Get() != nullptr) { 3576 self->ClearException(); 3577 } 3578 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3579 if (cause.Get() != nullptr) { 3580 self->GetException(nullptr)->SetCause(cause.Get()); 3581 } 3582 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3583 if (Runtime::Current()->IsCompiler()) { 3584 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3585 } 3586 klass->SetStatus(mirror::Class::kStatusError, self); 3587 return; 3588 } 3589 } 3590 3591 // Try to use verification information from the oat file, otherwise do runtime verification. 3592 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3593 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3594 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3595 if (oat_file_class_status == mirror::Class::kStatusError) { 3596 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3597 << PrettyDescriptor(klass.Get()) << " in " 3598 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3599 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3600 PrettyDescriptor(klass.Get()).c_str()); 3601 klass->SetStatus(mirror::Class::kStatusError, self); 3602 return; 3603 } 3604 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3605 std::string error_msg; 3606 if (!preverified) { 3607 verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(), 3608 Runtime::Current()->IsCompiler(), 3609 &error_msg); 3610 } 3611 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3612 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3613 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3614 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3615 << " because: " << error_msg; 3616 } 3617 self->AssertNoPendingException(); 3618 // Make sure all classes referenced by catch blocks are resolved. 3619 ResolveClassExceptionHandlerTypes(dex_file, klass); 3620 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3621 // Even though there were no verifier failures we need to respect whether the super-class 3622 // was verified or requiring runtime reverification. 3623 if (super.Get() == nullptr || super->IsVerified()) { 3624 klass->SetStatus(mirror::Class::kStatusVerified, self); 3625 } else { 3626 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3627 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3628 // Pretend a soft failure occured so that we don't consider the class verified below. 3629 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3630 } 3631 } else { 3632 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3633 // Soft failures at compile time should be retried at runtime. Soft 3634 // failures at runtime will be handled by slow paths in the generated 3635 // code. Set status accordingly. 3636 if (Runtime::Current()->IsCompiler()) { 3637 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3638 } else { 3639 klass->SetStatus(mirror::Class::kStatusVerified, self); 3640 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3641 // later. 3642 klass->SetPreverified(); 3643 } 3644 } 3645 } else { 3646 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3647 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3648 << " because: " << error_msg; 3649 self->AssertNoPendingException(); 3650 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3651 klass->SetStatus(mirror::Class::kStatusError, self); 3652 } 3653 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3654 // Class is verified so we don't need to do any access check on its methods. 3655 // Let the interpreter know it by setting the kAccPreverified flag onto each 3656 // method. 3657 // Note: we're going here during compilation and at runtime. When we set the 3658 // kAccPreverified flag when compiling image classes, the flag is recorded 3659 // in the image and is set when loading the image. 3660 EnsurePreverifiedMethods(klass); 3661 } 3662} 3663 3664void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3665 if (!klass->IsPreverified()) { 3666 klass->SetPreverifiedFlagOnAllMethods(); 3667 klass->SetPreverified(); 3668 } 3669} 3670 3671bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3672 mirror::Class::Status& oat_file_class_status) { 3673 // If we're compiling, we can only verify the class using the oat file if 3674 // we are not compiling the image or if the class we're verifying is not part of 3675 // the app. In other words, we will only check for preverification of bootclasspath 3676 // classes. 3677 if (Runtime::Current()->IsCompiler()) { 3678 // Are we compiling the bootclasspath? 3679 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3680 return false; 3681 } 3682 // We are compiling an app (not the image). 3683 3684 // Is this an app class? (I.e. not a bootclasspath class) 3685 if (klass->GetClassLoader() != nullptr) { 3686 return false; 3687 } 3688 } 3689 3690 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3691 // In case we run without an image there won't be a backing oat file. 3692 if (oat_dex_file == nullptr) { 3693 return false; 3694 } 3695 3696 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3697 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3698 if (oat_file_class_status == mirror::Class::kStatusVerified || 3699 oat_file_class_status == mirror::Class::kStatusInitialized) { 3700 return true; 3701 } 3702 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3703 // Compile time verification failed with a soft error. Compile time verification can fail 3704 // because we have incomplete type information. Consider the following: 3705 // class ... { 3706 // Foo x; 3707 // .... () { 3708 // if (...) { 3709 // v1 gets assigned a type of resolved class Foo 3710 // } else { 3711 // v1 gets assigned a type of unresolved class Bar 3712 // } 3713 // iput x = v1 3714 // } } 3715 // when we merge v1 following the if-the-else it results in Conflict 3716 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3717 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3718 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3719 // at compile time). 3720 return false; 3721 } 3722 if (oat_file_class_status == mirror::Class::kStatusError) { 3723 // Compile time verification failed with a hard error. This is caused by invalid instructions 3724 // in the class. These errors are unrecoverable. 3725 return false; 3726 } 3727 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3728 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3729 // not loading the class. 3730 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3731 // isn't a problem and this case shouldn't occur 3732 return false; 3733 } 3734 std::string temp; 3735 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3736 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3737 << klass->GetDescriptor(&temp); 3738 3739 return false; 3740} 3741 3742void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3743 Handle<mirror::Class> klass) { 3744 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3745 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3746 } 3747 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3748 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3749 } 3750} 3751 3752void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3753 mirror::ArtMethod* method) { 3754 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3755 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3756 if (code_item == nullptr) { 3757 return; // native or abstract method 3758 } 3759 if (code_item->tries_size_ == 0) { 3760 return; // nothing to process 3761 } 3762 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3763 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3764 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3765 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3766 CatchHandlerIterator iterator(handlers_ptr); 3767 for (; iterator.HasNext(); iterator.Next()) { 3768 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3769 // unresolved exception types will be ignored by exception delivery 3770 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3771 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3772 if (exception_type == nullptr) { 3773 DCHECK(Thread::Current()->IsExceptionPending()); 3774 Thread::Current()->ClearException(); 3775 } 3776 } 3777 } 3778 handlers_ptr = iterator.EndDataPointer(); 3779 } 3780} 3781 3782static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3783static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3784 Handle<mirror::ArtMethod> prototype); 3785 3786mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3787 jobjectArray interfaces, jobject loader, 3788 jobjectArray methods, jobjectArray throws) { 3789 Thread* self = soa.Self(); 3790 StackHandleScope<8> hs(self); 3791 MutableHandle<mirror::Class> klass(hs.NewHandle( 3792 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3793 if (klass.Get() == nullptr) { 3794 CHECK(self->IsExceptionPending()); // OOME. 3795 return nullptr; 3796 } 3797 DCHECK(klass->GetClass() != nullptr); 3798 klass->SetObjectSize(sizeof(mirror::Proxy)); 3799 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3800 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3801 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3802 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3803 klass->SetName(soa.Decode<mirror::String*>(name)); 3804 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3805 klass->SetDexCache(proxy_class->GetDexCache()); 3806 klass->SetStatus(mirror::Class::kStatusIdx, self); 3807 3808 // Instance fields are inherited, but we add a couple of static fields... 3809 { 3810 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3811 if (UNLIKELY(sfields == nullptr)) { 3812 CHECK(self->IsExceptionPending()); // OOME. 3813 return nullptr; 3814 } 3815 klass->SetSFields(sfields); 3816 } 3817 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3818 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3819 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3820 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3821 CHECK(self->IsExceptionPending()); // OOME. 3822 return nullptr; 3823 } 3824 klass->SetStaticField(0, interfaces_sfield.Get()); 3825 interfaces_sfield->SetDexFieldIndex(0); 3826 interfaces_sfield->SetDeclaringClass(klass.Get()); 3827 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3828 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3829 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3830 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3831 CHECK(self->IsExceptionPending()); // OOME. 3832 return nullptr; 3833 } 3834 klass->SetStaticField(1, throws_sfield.Get()); 3835 throws_sfield->SetDexFieldIndex(1); 3836 throws_sfield->SetDeclaringClass(klass.Get()); 3837 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3838 3839 // Proxies have 1 direct method, the constructor 3840 { 3841 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3842 if (UNLIKELY(directs == nullptr)) { 3843 CHECK(self->IsExceptionPending()); // OOME. 3844 return nullptr; 3845 } 3846 klass->SetDirectMethods(directs); 3847 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3848 if (UNLIKELY(constructor == nullptr)) { 3849 CHECK(self->IsExceptionPending()); // OOME. 3850 return nullptr; 3851 } 3852 klass->SetDirectMethod(0, constructor); 3853 } 3854 3855 // Create virtual method using specified prototypes. 3856 size_t num_virtual_methods = 3857 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3858 { 3859 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3860 num_virtual_methods); 3861 if (UNLIKELY(virtuals == nullptr)) { 3862 CHECK(self->IsExceptionPending()); // OOME. 3863 return nullptr; 3864 } 3865 klass->SetVirtualMethods(virtuals); 3866 } 3867 for (size_t i = 0; i < num_virtual_methods; ++i) { 3868 StackHandleScope<1> hs(self); 3869 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3870 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3871 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3872 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3873 if (UNLIKELY(clone == nullptr)) { 3874 CHECK(self->IsExceptionPending()); // OOME. 3875 return nullptr; 3876 } 3877 klass->SetVirtualMethod(i, clone); 3878 } 3879 3880 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3881 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3882 self->AssertNoPendingException(); 3883 3884 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3885 mirror::Class* new_class = nullptr; 3886 { 3887 // Must hold lock on object when resolved. 3888 ObjectLock<mirror::Class> resolution_lock(self, klass); 3889 // Link the fields and virtual methods, creating vtable and iftables 3890 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3891 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3892 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3893 klass->SetStatus(mirror::Class::kStatusError, self); 3894 return nullptr; 3895 } 3896 } 3897 3898 CHECK(klass->IsRetired()); 3899 CHECK_NE(klass.Get(), new_class); 3900 klass.Assign(new_class); 3901 3902 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3903 interfaces_sfield->SetObject<false>(klass.Get(), 3904 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3905 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3906 throws_sfield->SetObject<false>(klass.Get(), 3907 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3908 3909 { 3910 // Lock on klass is released. Lock new class object. 3911 ObjectLock<mirror::Class> initialization_lock(self, klass); 3912 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3913 } 3914 3915 // sanity checks 3916 if (kIsDebugBuild) { 3917 CHECK(klass->GetIFields() == nullptr); 3918 CheckProxyConstructor(klass->GetDirectMethod(0)); 3919 for (size_t i = 0; i < num_virtual_methods; ++i) { 3920 StackHandleScope<2> hs(self); 3921 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3922 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3923 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3924 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3925 CheckProxyMethod(virtual_method, prototype); 3926 } 3927 3928 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3929 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3930 decoded_name->ToModifiedUtf8().c_str())); 3931 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3932 3933 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3934 decoded_name->ToModifiedUtf8().c_str())); 3935 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3936 3937 CHECK_EQ(klass.Get()->GetInterfaces(), 3938 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3939 CHECK_EQ(klass.Get()->GetThrows(), 3940 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3941 } 3942 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3943 CHECK(existing == nullptr); 3944 return klass.Get(); 3945} 3946 3947std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3948 DCHECK(proxy_class->IsProxyClass()); 3949 mirror::String* name = proxy_class->GetName(); 3950 DCHECK(name != nullptr); 3951 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3952} 3953 3954mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3955 mirror::ArtMethod* proxy_method) { 3956 DCHECK(proxy_class->IsProxyClass()); 3957 DCHECK(proxy_method->IsProxyMethod()); 3958 // Locate the dex cache of the original interface/Object 3959 mirror::DexCache* dex_cache = nullptr; 3960 { 3961 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3962 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3963 mirror::DexCache* a_dex_cache = GetDexCache(i); 3964 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3965 dex_cache = a_dex_cache; 3966 break; 3967 } 3968 } 3969 } 3970 CHECK(dex_cache != nullptr); 3971 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3972 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3973 CHECK(resolved_method != nullptr); 3974 return resolved_method; 3975} 3976 3977 3978mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3979 Handle<mirror::Class> klass, 3980 mirror::Class* proxy_class) { 3981 // Create constructor for Proxy that must initialize h 3982 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3983 proxy_class->GetDirectMethods(); 3984 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3985 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3986 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3987 // constructor method. 3988 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3989 proxy_constructor); 3990 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3991 // code_ too) 3992 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3993 if (constructor == nullptr) { 3994 CHECK(self->IsExceptionPending()); // OOME. 3995 return nullptr; 3996 } 3997 // Make this constructor public and fix the class to be our Proxy version 3998 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3999 constructor->SetDeclaringClass(klass.Get()); 4000 return constructor; 4001} 4002 4003static void CheckProxyConstructor(mirror::ArtMethod* constructor) 4004 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4005 CHECK(constructor->IsConstructor()); 4006 CHECK_STREQ(constructor->GetName(), "<init>"); 4007 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4008 "(Ljava/lang/reflect/InvocationHandler;)V"); 4009 DCHECK(constructor->IsPublic()); 4010} 4011 4012mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4013 Handle<mirror::Class> klass, 4014 Handle<mirror::ArtMethod> prototype) { 4015 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4016 // prototype method 4017 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4018 prototype.Get()); 4019 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4020 // as necessary 4021 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4022 if (UNLIKELY(method == nullptr)) { 4023 CHECK(self->IsExceptionPending()); // OOME. 4024 return nullptr; 4025 } 4026 4027 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4028 // the intersection of throw exceptions as defined in Proxy 4029 method->SetDeclaringClass(klass.Get()); 4030 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4031 4032 // At runtime the method looks like a reference and argument saving method, clone the code 4033 // related parameters from this method. 4034 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4035 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4036 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4037 4038 return method; 4039} 4040 4041static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 4042 Handle<mirror::ArtMethod> prototype) 4043 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4044 // Basic sanity 4045 CHECK(!prototype->IsFinal()); 4046 CHECK(method->IsFinal()); 4047 CHECK(!method->IsAbstract()); 4048 4049 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4050 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4051 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 4052 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4053 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4054 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4055 4056 StackHandleScope<2> hs(Thread::Current()); 4057 MethodHelper mh(hs.NewHandle(method.Get())); 4058 MethodHelper mh2(hs.NewHandle(prototype.Get())); 4059 CHECK_STREQ(method->GetName(), prototype->GetName()); 4060 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4061 // More complex sanity - via dex cache 4062 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4063} 4064 4065static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4066 bool can_init_parents) 4067 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4068 if (can_init_statics && can_init_parents) { 4069 return true; 4070 } 4071 if (!can_init_statics) { 4072 // Check if there's a class initializer. 4073 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4074 if (clinit != nullptr) { 4075 return false; 4076 } 4077 // Check if there are encoded static values needing initialization. 4078 if (klass->NumStaticFields() != 0) { 4079 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4080 DCHECK(dex_class_def != nullptr); 4081 if (dex_class_def->static_values_off_ != 0) { 4082 return false; 4083 } 4084 } 4085 } 4086 if (!klass->IsInterface() && klass->HasSuperClass()) { 4087 mirror::Class* super_class = klass->GetSuperClass(); 4088 if (!can_init_parents && !super_class->IsInitialized()) { 4089 return false; 4090 } else { 4091 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4092 return false; 4093 } 4094 } 4095 } 4096 return true; 4097} 4098 4099bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass, 4100 bool can_init_statics, bool can_init_parents) { 4101 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4102 4103 // Are we already initialized and therefore done? 4104 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4105 // an initialized class will never change its state. 4106 if (klass->IsInitialized()) { 4107 return true; 4108 } 4109 4110 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4111 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4112 return false; 4113 } 4114 4115 self->AllowThreadSuspension(); 4116 uint64_t t0; 4117 { 4118 ObjectLock<mirror::Class> lock(self, klass); 4119 4120 // Re-check under the lock in case another thread initialized ahead of us. 4121 if (klass->IsInitialized()) { 4122 return true; 4123 } 4124 4125 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4126 if (klass->IsErroneous()) { 4127 ThrowEarlierClassFailure(klass.Get()); 4128 VlogClassInitializationFailure(klass); 4129 return false; 4130 } 4131 4132 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4133 4134 if (!klass->IsVerified()) { 4135 VerifyClass(self, klass); 4136 if (!klass->IsVerified()) { 4137 // We failed to verify, expect either the klass to be erroneous or verification failed at 4138 // compile time. 4139 if (klass->IsErroneous()) { 4140 CHECK(self->IsExceptionPending()); 4141 VlogClassInitializationFailure(klass); 4142 } else { 4143 CHECK(Runtime::Current()->IsCompiler()); 4144 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4145 } 4146 return false; 4147 } else { 4148 self->AssertNoPendingException(); 4149 } 4150 } 4151 4152 // If the class is kStatusInitializing, either this thread is 4153 // initializing higher up the stack or another thread has beat us 4154 // to initializing and we need to wait. Either way, this 4155 // invocation of InitializeClass will not be responsible for 4156 // running <clinit> and will return. 4157 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4158 // Could have got an exception during verification. 4159 if (self->IsExceptionPending()) { 4160 VlogClassInitializationFailure(klass); 4161 return false; 4162 } 4163 // We caught somebody else in the act; was it us? 4164 if (klass->GetClinitThreadId() == self->GetTid()) { 4165 // Yes. That's fine. Return so we can continue initializing. 4166 return true; 4167 } 4168 // No. That's fine. Wait for another thread to finish initializing. 4169 return WaitForInitializeClass(klass, self, lock); 4170 } 4171 4172 if (!ValidateSuperClassDescriptors(klass)) { 4173 klass->SetStatus(mirror::Class::kStatusError, self); 4174 return false; 4175 } 4176 self->AllowThreadSuspension(); 4177 4178 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4179 4180 // From here out other threads may observe that we're initializing and so changes of state 4181 // require the a notification. 4182 klass->SetClinitThreadId(self->GetTid()); 4183 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4184 4185 t0 = NanoTime(); 4186 } 4187 4188 // Initialize super classes, must be done while initializing for the JLS. 4189 if (!klass->IsInterface() && klass->HasSuperClass()) { 4190 mirror::Class* super_class = klass->GetSuperClass(); 4191 if (!super_class->IsInitialized()) { 4192 CHECK(!super_class->IsInterface()); 4193 CHECK(can_init_parents); 4194 StackHandleScope<1> hs(self); 4195 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4196 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true); 4197 if (!super_initialized) { 4198 // The super class was verified ahead of entering initializing, we should only be here if 4199 // the super class became erroneous due to initialization. 4200 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4201 << "Super class initialization failed for " 4202 << PrettyDescriptor(handle_scope_super.Get()) 4203 << " that has unexpected status " << handle_scope_super->GetStatus() 4204 << "\nPending exception:\n" 4205 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4206 ObjectLock<mirror::Class> lock(self, klass); 4207 // Initialization failed because the super-class is erroneous. 4208 klass->SetStatus(mirror::Class::kStatusError, self); 4209 return false; 4210 } 4211 } 4212 } 4213 4214 if (klass->NumStaticFields() > 0) { 4215 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4216 CHECK(dex_class_def != nullptr); 4217 const DexFile& dex_file = klass->GetDexFile(); 4218 StackHandleScope<3> hs(self); 4219 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4220 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4221 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader, 4222 this, *dex_class_def); 4223 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def); 4224 ClassDataItemIterator field_it(dex_file, class_data); 4225 if (value_it.HasNext()) { 4226 DCHECK(field_it.HasNextStaticField()); 4227 CHECK(can_init_statics); 4228 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) { 4229 StackHandleScope<1> hs(self); 4230 Handle<mirror::ArtField> field(hs.NewHandle( 4231 ResolveField(dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true))); 4232 if (Runtime::Current()->IsActiveTransaction()) { 4233 value_it.ReadValueToField<true>(field); 4234 } else { 4235 value_it.ReadValueToField<false>(field); 4236 } 4237 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField()); 4238 } 4239 } 4240 } 4241 4242 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4243 if (clinit != nullptr) { 4244 CHECK(can_init_statics); 4245 JValue result; 4246 clinit->Invoke(self, nullptr, 0, &result, "V"); 4247 } 4248 4249 self->AllowThreadSuspension(); 4250 uint64_t t1 = NanoTime(); 4251 4252 bool success = true; 4253 { 4254 ObjectLock<mirror::Class> lock(self, klass); 4255 4256 if (self->IsExceptionPending()) { 4257 WrapExceptionInInitializer(klass); 4258 klass->SetStatus(mirror::Class::kStatusError, self); 4259 success = false; 4260 } else { 4261 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4262 RuntimeStats* thread_stats = self->GetStats(); 4263 ++global_stats->class_init_count; 4264 ++thread_stats->class_init_count; 4265 global_stats->class_init_time_ns += (t1 - t0); 4266 thread_stats->class_init_time_ns += (t1 - t0); 4267 // Set the class as initialized except if failed to initialize static fields. 4268 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4269 if (VLOG_IS_ON(class_linker)) { 4270 std::string temp; 4271 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4272 klass->GetLocation(); 4273 } 4274 // Opportunistically set static method trampolines to their destination. 4275 FixupStaticTrampolines(klass.Get()); 4276 } 4277 } 4278 return success; 4279} 4280 4281bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4282 ObjectLock<mirror::Class>& lock) 4283 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4284 while (true) { 4285 self->AssertNoPendingException(); 4286 CHECK(!klass->IsInitialized()); 4287 lock.WaitIgnoringInterrupts(); 4288 4289 // When we wake up, repeat the test for init-in-progress. If 4290 // there's an exception pending (only possible if 4291 // we were not using WaitIgnoringInterrupts), bail out. 4292 if (self->IsExceptionPending()) { 4293 WrapExceptionInInitializer(klass); 4294 klass->SetStatus(mirror::Class::kStatusError, self); 4295 return false; 4296 } 4297 // Spurious wakeup? Go back to waiting. 4298 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4299 continue; 4300 } 4301 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4302 // Compile time initialization failed. 4303 return false; 4304 } 4305 if (klass->IsErroneous()) { 4306 // The caller wants an exception, but it was thrown in a 4307 // different thread. Synthesize one here. 4308 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4309 PrettyDescriptor(klass.Get()).c_str()); 4310 VlogClassInitializationFailure(klass); 4311 return false; 4312 } 4313 if (klass->IsInitialized()) { 4314 return true; 4315 } 4316 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4317 << klass->GetStatus(); 4318 } 4319 UNREACHABLE(); 4320} 4321 4322bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4323 if (klass->IsInterface()) { 4324 return true; 4325 } 4326 // Begin with the methods local to the superclass. 4327 StackHandleScope<2> hs(Thread::Current()); 4328 MutableMethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4329 MutableMethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4330 if (klass->HasSuperClass() && 4331 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4332 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4333 mh.ChangeMethod(klass->GetVTableEntry(i)); 4334 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4335 if (mh.GetMethod() != super_mh.GetMethod() && 4336 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4337 ThrowLinkageError(klass.Get(), 4338 "Class %s method %s resolves differently in superclass %s", 4339 PrettyDescriptor(klass.Get()).c_str(), 4340 PrettyMethod(mh.GetMethod()).c_str(), 4341 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4342 return false; 4343 } 4344 } 4345 } 4346 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4347 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4348 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4349 for (uint32_t j = 0; j < num_methods; ++j) { 4350 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4351 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4352 if (mh.GetMethod() != super_mh.GetMethod() && 4353 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4354 ThrowLinkageError(klass.Get(), 4355 "Class %s method %s resolves differently in interface %s", 4356 PrettyDescriptor(klass.Get()).c_str(), 4357 PrettyMethod(mh.GetMethod()).c_str(), 4358 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4359 return false; 4360 } 4361 } 4362 } 4363 } 4364 return true; 4365} 4366 4367bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 4368 bool can_init_parents) { 4369 DCHECK(c.Get() != nullptr); 4370 if (c->IsInitialized()) { 4371 EnsurePreverifiedMethods(c); 4372 return true; 4373 } 4374 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents); 4375 if (!success) { 4376 if (can_init_fields && can_init_parents) { 4377 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4378 } 4379 } else { 4380 self->AssertNoPendingException(); 4381 } 4382 return success; 4383} 4384 4385void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4386 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4387 if (fields != nullptr) { 4388 for (int index = 0; index < fields->GetLength(); index ++) { 4389 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4390 fields->Get(index)->SetDeclaringClass(new_class); 4391 } 4392 } 4393 } 4394 4395 fields = new_class->GetSFields(); 4396 if (fields != nullptr) { 4397 for (int index = 0; index < fields->GetLength(); index ++) { 4398 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4399 fields->Get(index)->SetDeclaringClass(new_class); 4400 } 4401 } 4402 } 4403 4404 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4405 if (methods != nullptr) { 4406 for (int index = 0; index < methods->GetLength(); index ++) { 4407 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4408 methods->Get(index)->SetDeclaringClass(new_class); 4409 } 4410 } 4411 } 4412 4413 methods = new_class->GetVirtualMethods(); 4414 if (methods != nullptr) { 4415 for (int index = 0; index < methods->GetLength(); index ++) { 4416 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4417 methods->Get(index)->SetDeclaringClass(new_class); 4418 } 4419 } 4420 } 4421} 4422 4423bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4424 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4425 mirror::Class** new_class) { 4426 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4427 4428 if (!LinkSuperClass(klass)) { 4429 return false; 4430 } 4431 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4432 self, Runtime::Current()->GetImtUnimplementedMethod()); 4433 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4434 return false; 4435 } 4436 if (!LinkInstanceFields(self, klass)) { 4437 return false; 4438 } 4439 size_t class_size; 4440 if (!LinkStaticFields(self, klass, &class_size)) { 4441 return false; 4442 } 4443 CreateReferenceInstanceOffsets(klass); 4444 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4445 4446 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4447 // We don't need to retire this class as it has no embedded tables or it was created the 4448 // correct size during class linker initialization. 4449 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4450 4451 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4452 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4453 } 4454 4455 // This will notify waiters on klass that saw the not yet resolved 4456 // class in the class_table_ during EnsureResolved. 4457 klass->SetStatus(mirror::Class::kStatusResolved, self); 4458 *new_class = klass.Get(); 4459 } else { 4460 CHECK(!klass->IsResolved()); 4461 // Retire the temporary class and create the correctly sized resolved class. 4462 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4463 if (UNLIKELY(*new_class == nullptr)) { 4464 CHECK(self->IsExceptionPending()); // Expect an OOME. 4465 klass->SetStatus(mirror::Class::kStatusError, self); 4466 return false; 4467 } 4468 4469 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4470 StackHandleScope<1> hs(self); 4471 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4472 ObjectLock<mirror::Class> lock(self, new_class_h); 4473 4474 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4475 4476 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4477 CHECK(existing == nullptr || existing == klass.Get()); 4478 4479 // This will notify waiters on temp class that saw the not yet resolved class in the 4480 // class_table_ during EnsureResolved. 4481 klass->SetStatus(mirror::Class::kStatusRetired, self); 4482 4483 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4484 // This will notify waiters on new_class that saw the not yet resolved 4485 // class in the class_table_ during EnsureResolved. 4486 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4487 } 4488 return true; 4489} 4490 4491bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4492 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4493 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4494 uint16_t super_class_idx = class_def.superclass_idx_; 4495 if (super_class_idx != DexFile::kDexNoIndex16) { 4496 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4497 if (super_class == nullptr) { 4498 DCHECK(Thread::Current()->IsExceptionPending()); 4499 return false; 4500 } 4501 // Verify 4502 if (!klass->CanAccess(super_class)) { 4503 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4504 PrettyDescriptor(super_class).c_str(), 4505 PrettyDescriptor(klass.Get()).c_str()); 4506 return false; 4507 } 4508 CHECK(super_class->IsResolved()); 4509 klass->SetSuperClass(super_class); 4510 } 4511 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4512 if (interfaces != nullptr) { 4513 for (size_t i = 0; i < interfaces->Size(); i++) { 4514 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4515 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4516 if (interface == nullptr) { 4517 DCHECK(Thread::Current()->IsExceptionPending()); 4518 return false; 4519 } 4520 // Verify 4521 if (!klass->CanAccess(interface)) { 4522 // TODO: the RI seemed to ignore this in my testing. 4523 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4524 PrettyDescriptor(interface).c_str(), 4525 PrettyDescriptor(klass.Get()).c_str()); 4526 return false; 4527 } 4528 } 4529 } 4530 // Mark the class as loaded. 4531 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4532 return true; 4533} 4534 4535bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4536 CHECK(!klass->IsPrimitive()); 4537 mirror::Class* super = klass->GetSuperClass(); 4538 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4539 if (super != nullptr) { 4540 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4541 return false; 4542 } 4543 return true; 4544 } 4545 if (super == nullptr) { 4546 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4547 PrettyDescriptor(klass.Get()).c_str()); 4548 return false; 4549 } 4550 // Verify 4551 if (super->IsFinal() || super->IsInterface()) { 4552 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4553 PrettyDescriptor(super).c_str(), 4554 PrettyDescriptor(klass.Get()).c_str(), 4555 super->IsFinal() ? "declared final" : "an interface"); 4556 return false; 4557 } 4558 if (!klass->CanAccess(super)) { 4559 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4560 PrettyDescriptor(super).c_str(), 4561 PrettyDescriptor(klass.Get()).c_str()); 4562 return false; 4563 } 4564 4565 // Inherit kAccClassIsFinalizable from the superclass in case this 4566 // class doesn't override finalize. 4567 if (super->IsFinalizable()) { 4568 klass->SetFinalizable(); 4569 } 4570 4571 // Inherit reference flags (if any) from the superclass. 4572 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4573 if (reference_flags != 0) { 4574 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4575 } 4576 // Disallow custom direct subclasses of java.lang.ref.Reference. 4577 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4578 ThrowLinkageError(klass.Get(), 4579 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4580 PrettyDescriptor(klass.Get()).c_str()); 4581 return false; 4582 } 4583 4584 if (kIsDebugBuild) { 4585 // Ensure super classes are fully resolved prior to resolving fields.. 4586 while (super != nullptr) { 4587 CHECK(super->IsResolved()); 4588 super = super->GetSuperClass(); 4589 } 4590 } 4591 return true; 4592} 4593 4594// Populate the class vtable and itable. Compute return type indices. 4595bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4596 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4597 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4598 self->AllowThreadSuspension(); 4599 if (klass->IsInterface()) { 4600 // No vtable. 4601 size_t count = klass->NumVirtualMethods(); 4602 if (!IsUint(16, count)) { 4603 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4604 return false; 4605 } 4606 for (size_t i = 0; i < count; ++i) { 4607 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4608 } 4609 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4610 return false; 4611 } 4612 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4613} 4614 4615bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4616 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4617 if (klass->HasSuperClass()) { 4618 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4619 const size_t max_count = num_virtual_methods + super_vtable_length; 4620 size_t actual_count = super_vtable_length; 4621 StackHandleScope<2> hs(self); 4622 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4623 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4624 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4625 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4626 if (UNLIKELY(vtable.Get() == nullptr)) { 4627 CHECK(self->IsExceptionPending()); // OOME. 4628 return false; 4629 } 4630 for (size_t i = 0; i < super_vtable_length; i++) { 4631 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4632 } 4633 } else { 4634 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4635 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4636 if (UNLIKELY(vtable.Get() == nullptr)) { 4637 CHECK(self->IsExceptionPending()); // OOME. 4638 return false; 4639 } 4640 } 4641 4642 // See if any of our virtual methods override the superclass. 4643 for (size_t i = 0; i < num_virtual_methods; ++i) { 4644 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4645 MethodProtoHelper local_helper(local_method); 4646 size_t j = 0; 4647 for (; j < actual_count; ++j) { 4648 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4649 MethodProtoHelper super_helper(super_method); 4650 if (local_helper.HasSameNameAndSignature(super_helper)) { 4651 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4652 super_method->GetAccessFlags())) { 4653 if (super_method->IsFinal()) { 4654 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4655 PrettyMethod(local_method).c_str(), 4656 super_method->GetDeclaringClassDescriptor()); 4657 return false; 4658 } 4659 vtable->SetWithoutChecks<false>(j, local_method); 4660 local_method->SetMethodIndex(j); 4661 break; 4662 } 4663 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4664 << " would have incorrectly overridden the package-private method in " 4665 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4666 } 4667 } 4668 if (j == actual_count) { 4669 // Not overriding, append. 4670 vtable->SetWithoutChecks<false>(actual_count, local_method); 4671 local_method->SetMethodIndex(actual_count); 4672 ++actual_count; 4673 } 4674 } 4675 if (!IsUint(16, actual_count)) { 4676 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4677 return false; 4678 } 4679 // Shrink vtable if possible 4680 CHECK_LE(actual_count, max_count); 4681 if (actual_count < max_count) { 4682 vtable.Assign(vtable->CopyOf(self, actual_count)); 4683 if (UNLIKELY(vtable.Get() == nullptr)) { 4684 CHECK(self->IsExceptionPending()); // OOME. 4685 return false; 4686 } 4687 } 4688 klass->SetVTable(vtable.Get()); 4689 } else { 4690 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4691 if (!IsUint(16, num_virtual_methods)) { 4692 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 4693 static_cast<int>(num_virtual_methods)); 4694 return false; 4695 } 4696 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 4697 if (UNLIKELY(vtable == 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->SetWithoutChecks<false>(i, virtual_method); 4704 virtual_method->SetMethodIndex(i & 0xFFFF); 4705 } 4706 klass->SetVTable(vtable); 4707 } 4708 return true; 4709} 4710 4711bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 4712 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4713 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4714 StackHandleScope<3> hs(self); 4715 Runtime* const runtime = Runtime::Current(); 4716 const bool has_superclass = klass->HasSuperClass(); 4717 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 4718 const bool have_interfaces = interfaces.Get() != nullptr; 4719 const size_t num_interfaces = 4720 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 4721 if (num_interfaces == 0) { 4722 if (super_ifcount == 0) { 4723 // Class implements no interfaces. 4724 DCHECK_EQ(klass->GetIfTableCount(), 0); 4725 DCHECK(klass->GetIfTable() == nullptr); 4726 return true; 4727 } 4728 // Class implements same interfaces as parent, are any of these not marker interfaces? 4729 bool has_non_marker_interface = false; 4730 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4731 for (size_t i = 0; i < super_ifcount; ++i) { 4732 if (super_iftable->GetMethodArrayCount(i) > 0) { 4733 has_non_marker_interface = true; 4734 break; 4735 } 4736 } 4737 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4738 if (!has_non_marker_interface) { 4739 klass->SetIfTable(super_iftable); 4740 return true; 4741 } 4742 } 4743 size_t ifcount = super_ifcount + num_interfaces; 4744 for (size_t i = 0; i < num_interfaces; i++) { 4745 mirror::Class* interface = have_interfaces ? 4746 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 4747 DCHECK(interface != nullptr); 4748 if (UNLIKELY(!interface->IsInterface())) { 4749 std::string temp; 4750 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4751 PrettyDescriptor(klass.Get()).c_str(), 4752 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4753 return false; 4754 } 4755 ifcount += interface->GetIfTableCount(); 4756 } 4757 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4758 if (UNLIKELY(iftable.Get() == nullptr)) { 4759 CHECK(self->IsExceptionPending()); // OOME. 4760 return false; 4761 } 4762 if (super_ifcount != 0) { 4763 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4764 for (size_t i = 0; i < super_ifcount; i++) { 4765 mirror::Class* super_interface = super_iftable->GetInterface(i); 4766 iftable->SetInterface(i, super_interface); 4767 } 4768 } 4769 self->AllowThreadSuspension(); 4770 // Flatten the interface inheritance hierarchy. 4771 size_t idx = super_ifcount; 4772 for (size_t i = 0; i < num_interfaces; i++) { 4773 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 4774 mirror::Class::GetDirectInterface(self, klass, i); 4775 // Check if interface is already in iftable 4776 bool duplicate = false; 4777 for (size_t j = 0; j < idx; j++) { 4778 mirror::Class* existing_interface = iftable->GetInterface(j); 4779 if (existing_interface == interface) { 4780 duplicate = true; 4781 break; 4782 } 4783 } 4784 if (!duplicate) { 4785 // Add this non-duplicate interface. 4786 iftable->SetInterface(idx++, interface); 4787 // Add this interface's non-duplicate super-interfaces. 4788 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4789 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4790 bool super_duplicate = false; 4791 for (size_t k = 0; k < idx; k++) { 4792 mirror::Class* existing_interface = iftable->GetInterface(k); 4793 if (existing_interface == super_interface) { 4794 super_duplicate = true; 4795 break; 4796 } 4797 } 4798 if (!super_duplicate) { 4799 iftable->SetInterface(idx++, super_interface); 4800 } 4801 } 4802 } 4803 } 4804 self->AllowThreadSuspension(); 4805 // Shrink iftable in case duplicates were found 4806 if (idx < ifcount) { 4807 DCHECK_NE(num_interfaces, 0U); 4808 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4809 if (UNLIKELY(iftable.Get() == nullptr)) { 4810 CHECK(self->IsExceptionPending()); // OOME. 4811 return false; 4812 } 4813 ifcount = idx; 4814 } else { 4815 DCHECK_EQ(idx, ifcount); 4816 } 4817 klass->SetIfTable(iftable.Get()); 4818 // If we're an interface, we don't need the vtable pointers, so we're done. 4819 if (klass->IsInterface()) { 4820 return true; 4821 } 4822 size_t miranda_list_size = 0; 4823 size_t max_miranda_methods = 0; // The max size of miranda_list. 4824 for (size_t i = 0; i < ifcount; ++i) { 4825 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4826 } 4827 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> 4828 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4829 MutableHandle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4830 hs.NewHandle(klass->GetVTableDuringLinking())); 4831 // Copy the IMT from the super class if possible. 4832 bool extend_super_iftable = false; 4833 if (has_superclass) { 4834 mirror::Class* super_class = klass->GetSuperClass(); 4835 extend_super_iftable = true; 4836 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4837 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 4838 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 4839 } 4840 } else { 4841 // No imt in the super class, need to reconstruct from the iftable. 4842 mirror::IfTable* if_table = super_class->GetIfTable(); 4843 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4844 const size_t length = super_class->GetIfTableCount(); 4845 for (size_t i = 0; i < length; ++i) { 4846 mirror::Class* interface = iftable->GetInterface(i); 4847 const size_t num_virtuals = interface->NumVirtualMethods(); 4848 const size_t method_array_count = if_table->GetMethodArrayCount(i); 4849 DCHECK_EQ(num_virtuals, method_array_count); 4850 if (method_array_count == 0) { 4851 continue; 4852 } 4853 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 4854 for (size_t j = 0; j < num_virtuals; ++j) { 4855 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 4856 if (method->IsMiranda()) { 4857 continue; 4858 } 4859 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 4860 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4861 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4862 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4863 out_imt->SetReference(imt_index, method); 4864 } else if (imt_ref != conflict_method) { 4865 out_imt->SetReference(imt_index, conflict_method); 4866 } 4867 } 4868 } 4869 } 4870 } 4871 for (size_t i = 0; i < ifcount; ++i) { 4872 self->AllowThreadSuspension(); 4873 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4874 if (num_methods > 0) { 4875 StackHandleScope<2> hs(self); 4876 const bool is_super = i < super_ifcount; 4877 const bool super_interface = is_super && extend_super_iftable; 4878 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 4879 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 4880 if (super_interface) { 4881 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 4882 DCHECK(if_table != nullptr); 4883 DCHECK(if_table->GetMethodArray(i) != nullptr); 4884 // If we are working on a super interface, try extending the existing method array. 4885 method_array = hs.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 4886 AsObjectArray<mirror::ArtMethod>()); 4887 // We are overwriting a super class interface, try to only virtual methods instead of the 4888 // whole vtable. 4889 input_array = hs.NewHandle(klass->GetVirtualMethods()); 4890 } else { 4891 method_array = hs.NewHandle(AllocArtMethodArray(self, num_methods)); 4892 // A new interface, we need the whole vtable incase a new interface method is implemented 4893 // in the whole superclass. 4894 input_array = vtable; 4895 } 4896 if (UNLIKELY(method_array.Get() == nullptr)) { 4897 CHECK(self->IsExceptionPending()); // OOME. 4898 return false; 4899 } 4900 iftable->SetMethodArray(i, method_array.Get()); 4901 if (input_array.Get() == nullptr) { 4902 // If the added virtual methods is empty, do nothing. 4903 DCHECK(super_interface); 4904 continue; 4905 } 4906 for (size_t j = 0; j < num_methods; ++j) { 4907 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4908 MethodProtoHelper interface_helper(interface_method); 4909 int32_t k; 4910 // For each method listed in the interface's method list, find the 4911 // matching method in our class's method list. We want to favor the 4912 // subclass over the superclass, which just requires walking 4913 // back from the end of the vtable. (This only matters if the 4914 // superclass defines a private method and this class redefines 4915 // it -- otherwise it would use the same vtable slot. In .dex files 4916 // those don't end up in the virtual method table, so it shouldn't 4917 // matter which direction we go. We walk it backward anyway.) 4918 for (k = input_array->GetLength() - 1; k >= 0; --k) { 4919 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 4920 MethodProtoHelper vtable_helper(vtable_method); 4921 if (interface_helper.HasSameNameAndSignature(vtable_helper)) { 4922 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4923 ThrowIllegalAccessError( 4924 klass.Get(), 4925 "Method '%s' implementing interface method '%s' is not public", 4926 PrettyMethod(vtable_method).c_str(), 4927 PrettyMethod(interface_method).c_str()); 4928 return false; 4929 } 4930 method_array->SetWithoutChecks<false>(j, vtable_method); 4931 // Place method in imt if entry is empty, place conflict otherwise. 4932 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4933 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4934 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4935 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4936 out_imt->SetReference(imt_index, vtable_method); 4937 } else if (imt_ref != conflict_method) { 4938 // If we are not a conflict and we have the same signature and name as the imt entry, 4939 // it must be that we overwrote a superclass vtable entry. 4940 if (MethodProtoHelper(imt_ref).HasSameNameAndSignature(vtable_helper)) { 4941 out_imt->SetReference(imt_index, vtable_method); 4942 } else { 4943 out_imt->SetReference(imt_index, conflict_method); 4944 } 4945 } 4946 break; 4947 } 4948 } 4949 if (k < 0 && !super_interface) { 4950 mirror::ArtMethod* miranda_method = nullptr; 4951 for (size_t l = 0; l < miranda_list_size; ++l) { 4952 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4953 MethodProtoHelper vtable_helper(mir_method); 4954 if (interface_helper.HasSameNameAndSignature(vtable_helper)) { 4955 miranda_method = mir_method; 4956 break; 4957 } 4958 } 4959 if (miranda_method == nullptr) { 4960 // Point the interface table at a phantom slot. 4961 miranda_method = interface_method->Clone(self)->AsArtMethod(); 4962 if (UNLIKELY(miranda_method == nullptr)) { 4963 CHECK(self->IsExceptionPending()); // OOME. 4964 return false; 4965 } 4966 DCHECK_LT(miranda_list_size, max_miranda_methods); 4967 miranda_list->Set<false>(miranda_list_size++, miranda_method); 4968 } 4969 method_array->SetWithoutChecks<false>(j, miranda_method); 4970 } 4971 } 4972 } 4973 } 4974 if (miranda_list_size > 0) { 4975 int old_method_count = klass->NumVirtualMethods(); 4976 int new_method_count = old_method_count + miranda_list_size; 4977 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4978 if (old_method_count == 0) { 4979 virtuals = AllocArtMethodArray(self, new_method_count); 4980 } else { 4981 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4982 } 4983 if (UNLIKELY(virtuals == nullptr)) { 4984 CHECK(self->IsExceptionPending()); // OOME. 4985 return false; 4986 } 4987 klass->SetVirtualMethods(virtuals); 4988 4989 int old_vtable_count = vtable->GetLength(); 4990 int new_vtable_count = old_vtable_count + miranda_list_size; 4991 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4992 if (UNLIKELY(vtable.Get() == nullptr)) { 4993 CHECK(self->IsExceptionPending()); // OOME. 4994 return false; 4995 } 4996 for (size_t i = 0; i < miranda_list_size; ++i) { 4997 mirror::ArtMethod* method = miranda_list->Get(i); 4998 // Leave the declaring class alone as type indices are relative to it 4999 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5000 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5001 klass->SetVirtualMethod(old_method_count + i, method); 5002 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5003 } 5004 // TODO: do not assign to the vtable field until it is fully constructed. 5005 klass->SetVTable(vtable.Get()); 5006 } 5007 5008 if (kIsDebugBuild) { 5009 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 5010 for (int i = 0; i < vtable->GetLength(); ++i) { 5011 CHECK(vtable->GetWithoutChecks(i) != nullptr); 5012 } 5013 } 5014 5015 self->AllowThreadSuspension(); 5016 return true; 5017} 5018 5019bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) { 5020 CHECK(klass.Get() != nullptr); 5021 return LinkFields(self, klass, false, nullptr); 5022} 5023 5024bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) { 5025 CHECK(klass.Get() != nullptr); 5026 return LinkFields(self, klass, true, class_size); 5027} 5028 5029struct LinkFieldsComparator { 5030 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5031 } 5032 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5033 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5034 NO_THREAD_SAFETY_ANALYSIS { 5035 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit. 5036 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5037 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5038 if (type1 != type2) { 5039 bool is_primitive1 = type1 != Primitive::kPrimNot; 5040 bool is_primitive2 = type2 != Primitive::kPrimNot; 5041 if (type1 != type2) { 5042 if (is_primitive1 && is_primitive2) { 5043 // Larger primitive types go first. 5044 return Primitive::ComponentSize(type1) > Primitive::ComponentSize(type2); 5045 } else { 5046 // Reference always goes first. 5047 return !is_primitive1; 5048 } 5049 } 5050 } 5051 // same basic group? then sort by string. 5052 return strcmp(field1->GetName(), field2->GetName()) < 0; 5053 } 5054}; 5055 5056bool ClassLinker::LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, 5057 size_t* class_size) { 5058 self->AllowThreadSuspension(); 5059 size_t num_fields = 5060 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5061 5062 mirror::ObjectArray<mirror::ArtField>* fields = 5063 is_static ? klass->GetSFields() : klass->GetIFields(); 5064 5065 // Initialize field_offset 5066 MemberOffset field_offset(0); 5067 if (is_static) { 5068 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5069 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5070 // Static fields come after the embedded tables. 5071 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5072 0, 0, 0, 0, 0); 5073 } 5074 field_offset = MemberOffset(base); 5075 } else { 5076 mirror::Class* super_class = klass->GetSuperClass(); 5077 if (super_class != nullptr) { 5078 CHECK(super_class->IsResolved()) 5079 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5080 field_offset = MemberOffset(super_class->GetObjectSize()); 5081 } 5082 } 5083 5084 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5085 5086 // we want a relatively stable order so that adding new fields 5087 // minimizes disruption of C++ version such as Class and Method. 5088 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5089 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension( 5090 "Naked ArtField references in deque"); 5091 for (size_t i = 0; i < num_fields; i++) { 5092 mirror::ArtField* f = fields->Get(i); 5093 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5094 grouped_and_sorted_fields.push_back(f); 5095 } 5096 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5097 LinkFieldsComparator()); 5098 5099 // References should be at the front. 5100 size_t current_field = 0; 5101 size_t num_reference_fields = 0; 5102 FieldGaps gaps; 5103 5104 for (; current_field < num_fields; current_field++) { 5105 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5106 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5107 bool isPrimitive = type != Primitive::kPrimNot; 5108 if (isPrimitive) { 5109 break; // past last reference, move on to the next phase 5110 } 5111 if (UNLIKELY(!IsAligned<4>(field_offset.Uint32Value()))) { 5112 MemberOffset old_offset = field_offset; 5113 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4)); 5114 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps); 5115 } 5116 DCHECK(IsAligned<4>(field_offset.Uint32Value())); 5117 grouped_and_sorted_fields.pop_front(); 5118 num_reference_fields++; 5119 fields->Set<false>(current_field, field); 5120 field->SetOffset(field_offset); 5121 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5122 } 5123 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest 5124 // otherwise we could end up with suboptimal gap fills. 5125 ShuffleForward<8>(num_fields, ¤t_field, &field_offset, 5126 fields, &grouped_and_sorted_fields, &gaps); 5127 ShuffleForward<4>(num_fields, ¤t_field, &field_offset, 5128 fields, &grouped_and_sorted_fields, &gaps); 5129 ShuffleForward<2>(num_fields, ¤t_field, &field_offset, 5130 fields, &grouped_and_sorted_fields, &gaps); 5131 ShuffleForward<1>(num_fields, ¤t_field, &field_offset, 5132 fields, &grouped_and_sorted_fields, &gaps); 5133 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() << 5134 " fields."; 5135 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 5136 5137 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5138 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5139 // We know there are no non-reference fields in the Reference classes, and we know 5140 // that 'referent' is alphabetically last, so this is easy... 5141 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5142 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5143 --num_reference_fields; 5144 } 5145 5146 if (kIsDebugBuild) { 5147 // Make sure that all reference fields appear before 5148 // non-reference fields, and all double-wide fields are aligned. 5149 bool seen_non_ref = false; 5150 for (size_t i = 0; i < num_fields; i++) { 5151 mirror::ArtField* field = fields->Get(i); 5152 if ((false)) { // enable to debug field layout 5153 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5154 << " class=" << PrettyClass(klass.Get()) 5155 << " field=" << PrettyField(field) 5156 << " offset=" 5157 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5158 } 5159 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5160 bool is_primitive = type != Primitive::kPrimNot; 5161 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5162 strcmp("referent", field->GetName()) == 0) { 5163 is_primitive = true; // We lied above, so we have to expect a lie here. 5164 } 5165 if (is_primitive) { 5166 if (!seen_non_ref) { 5167 seen_non_ref = true; 5168 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5169 } 5170 } else { 5171 DCHECK(!seen_non_ref) << PrettyField(field); 5172 } 5173 } 5174 if (!seen_non_ref) { 5175 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5176 } 5177 } 5178 5179 size_t size = field_offset.Uint32Value(); 5180 // Update klass 5181 if (is_static) { 5182 klass->SetNumReferenceStaticFields(num_reference_fields); 5183 *class_size = size; 5184 } else { 5185 klass->SetNumReferenceInstanceFields(num_reference_fields); 5186 if (!klass->IsVariableSize()) { 5187 std::string temp; 5188 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5189 size_t previous_size = klass->GetObjectSize(); 5190 if (previous_size != 0) { 5191 // Make sure that we didn't originally have an incorrect size. 5192 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5193 } 5194 klass->SetObjectSize(size); 5195 } 5196 } 5197 return true; 5198} 5199 5200// Set the bitmap of reference offsets, refOffsets, from the ifields 5201// list. 5202void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5203 uint32_t reference_offsets = 0; 5204 mirror::Class* super_class = klass->GetSuperClass(); 5205 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially). 5206 if (super_class != nullptr) { 5207 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5208 // Compute reference offsets unless our superclass overflowed. 5209 if (reference_offsets != mirror::Class::kClassWalkSuper) { 5210 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking(); 5211 mirror::ObjectArray<mirror::ArtField>* fields = klass->GetIFields(); 5212 // All of the fields that contain object references are guaranteed 5213 // to be at the beginning of the fields list. 5214 for (size_t i = 0; i < num_reference_fields; ++i) { 5215 // Note that byte_offset is the offset from the beginning of 5216 // object, not the offset into instance data 5217 mirror::ArtField* field = fields->Get(i); 5218 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5219 uint32_t displaced_bitmap_position = 5220 (byte_offset.Uint32Value() - mirror::kObjectHeaderSize) / 5221 sizeof(mirror::HeapReference<mirror::Object>); 5222 if (displaced_bitmap_position >= 32) { 5223 // Can't encode offset so fall back on slow-path. 5224 reference_offsets = mirror::Class::kClassWalkSuper; 5225 break; 5226 } else { 5227 reference_offsets |= (1 << displaced_bitmap_position); 5228 } 5229 } 5230 } 5231 } 5232 klass->SetReferenceInstanceOffsets(reference_offsets); 5233} 5234 5235mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5236 Handle<mirror::DexCache> dex_cache) { 5237 DCHECK(dex_cache.Get() != nullptr); 5238 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5239 if (resolved != nullptr) { 5240 return resolved; 5241 } 5242 uint32_t utf16_length; 5243 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5244 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5245 dex_cache->SetResolvedString(string_idx, string); 5246 return string; 5247} 5248 5249mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5250 mirror::Class* referrer) { 5251 StackHandleScope<2> hs(Thread::Current()); 5252 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5253 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5254 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5255} 5256 5257mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5258 Handle<mirror::DexCache> dex_cache, 5259 Handle<mirror::ClassLoader> class_loader) { 5260 DCHECK(dex_cache.Get() != nullptr); 5261 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5262 if (resolved == nullptr) { 5263 Thread* self = Thread::Current(); 5264 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5265 resolved = FindClass(self, descriptor, class_loader); 5266 if (resolved != nullptr) { 5267 // TODO: we used to throw here if resolved's class loader was not the 5268 // boot class loader. This was to permit different classes with the 5269 // same name to be loaded simultaneously by different loaders 5270 dex_cache->SetResolvedType(type_idx, resolved); 5271 } else { 5272 CHECK(self->IsExceptionPending()) 5273 << "Expected pending exception for failed resolution of: " << descriptor; 5274 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5275 StackHandleScope<1> hs(self); 5276 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5277 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5278 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5279 self->ClearException(); 5280 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5281 self->GetException(nullptr)->SetCause(cause.Get()); 5282 } 5283 } 5284 } 5285 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5286 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5287 return resolved; 5288} 5289 5290mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5291 Handle<mirror::DexCache> dex_cache, 5292 Handle<mirror::ClassLoader> class_loader, 5293 Handle<mirror::ArtMethod> referrer, 5294 InvokeType type) { 5295 DCHECK(dex_cache.Get() != nullptr); 5296 // Check for hit in the dex cache. 5297 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5298 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5299 return resolved; 5300 } 5301 // Fail, get the declaring class. 5302 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5303 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5304 if (klass == nullptr) { 5305 DCHECK(Thread::Current()->IsExceptionPending()); 5306 return nullptr; 5307 } 5308 // Scan using method_idx, this saves string compares but will only hit for matching dex 5309 // caches/files. 5310 switch (type) { 5311 case kDirect: // Fall-through. 5312 case kStatic: 5313 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5314 break; 5315 case kInterface: 5316 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5317 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5318 break; 5319 case kSuper: // Fall-through. 5320 case kVirtual: 5321 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5322 break; 5323 default: 5324 LOG(FATAL) << "Unreachable - invocation type: " << type; 5325 UNREACHABLE(); 5326 } 5327 if (resolved == nullptr) { 5328 // Search by name, which works across dex files. 5329 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5330 const Signature signature = dex_file.GetMethodSignature(method_id); 5331 switch (type) { 5332 case kDirect: // Fall-through. 5333 case kStatic: 5334 resolved = klass->FindDirectMethod(name, signature); 5335 break; 5336 case kInterface: 5337 resolved = klass->FindInterfaceMethod(name, signature); 5338 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5339 break; 5340 case kSuper: // Fall-through. 5341 case kVirtual: 5342 resolved = klass->FindVirtualMethod(name, signature); 5343 break; 5344 } 5345 } 5346 // If we found a method, check for incompatible class changes. 5347 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5348 // Be a good citizen and update the dex cache to speed subsequent calls. 5349 dex_cache->SetResolvedMethod(method_idx, resolved); 5350 return resolved; 5351 } else { 5352 // If we had a method, it's an incompatible-class-change error. 5353 if (resolved != nullptr) { 5354 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5355 } else { 5356 // We failed to find the method which means either an access error, an incompatible class 5357 // change, or no such method. First try to find the method among direct and virtual methods. 5358 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5359 const Signature signature = dex_file.GetMethodSignature(method_id); 5360 switch (type) { 5361 case kDirect: 5362 case kStatic: 5363 resolved = klass->FindVirtualMethod(name, signature); 5364 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5365 // have had a resolved method before, which triggers the "true" branch above. 5366 break; 5367 case kInterface: 5368 case kVirtual: 5369 case kSuper: 5370 resolved = klass->FindDirectMethod(name, signature); 5371 break; 5372 } 5373 5374 // If we found something, check that it can be accessed by the referrer. 5375 if (resolved != nullptr && referrer.Get() != nullptr) { 5376 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5377 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5378 if (!referring_class->CanAccess(methods_class)) { 5379 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5380 resolved, type); 5381 return nullptr; 5382 } else if (!referring_class->CanAccessMember(methods_class, 5383 resolved->GetAccessFlags())) { 5384 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5385 return nullptr; 5386 } 5387 } 5388 5389 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5390 // methods and throw if we find the method there. If we find nothing, throw a 5391 // NoSuchMethodError. 5392 switch (type) { 5393 case kDirect: 5394 case kStatic: 5395 if (resolved != nullptr) { 5396 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5397 } else { 5398 resolved = klass->FindInterfaceMethod(name, signature); 5399 if (resolved != nullptr) { 5400 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5401 } else { 5402 ThrowNoSuchMethodError(type, klass, name, signature); 5403 } 5404 } 5405 break; 5406 case kInterface: 5407 if (resolved != nullptr) { 5408 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5409 } else { 5410 resolved = klass->FindVirtualMethod(name, signature); 5411 if (resolved != nullptr) { 5412 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5413 } else { 5414 ThrowNoSuchMethodError(type, klass, name, signature); 5415 } 5416 } 5417 break; 5418 case kSuper: 5419 if (resolved != nullptr) { 5420 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5421 } else { 5422 ThrowNoSuchMethodError(type, klass, name, signature); 5423 } 5424 break; 5425 case kVirtual: 5426 if (resolved != nullptr) { 5427 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5428 } else { 5429 resolved = klass->FindInterfaceMethod(name, signature); 5430 if (resolved != nullptr) { 5431 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5432 } else { 5433 ThrowNoSuchMethodError(type, klass, name, signature); 5434 } 5435 } 5436 break; 5437 } 5438 } 5439 DCHECK(Thread::Current()->IsExceptionPending()); 5440 return nullptr; 5441 } 5442} 5443 5444mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5445 Handle<mirror::DexCache> dex_cache, 5446 Handle<mirror::ClassLoader> class_loader, 5447 bool is_static) { 5448 DCHECK(dex_cache.Get() != nullptr); 5449 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5450 if (resolved != nullptr) { 5451 return resolved; 5452 } 5453 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5454 Thread* const self = Thread::Current(); 5455 StackHandleScope<1> hs(self); 5456 Handle<mirror::Class> klass( 5457 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5458 if (klass.Get() == nullptr) { 5459 DCHECK(Thread::Current()->IsExceptionPending()); 5460 return nullptr; 5461 } 5462 5463 if (is_static) { 5464 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5465 } else { 5466 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5467 } 5468 5469 if (resolved == nullptr) { 5470 const char* name = dex_file.GetFieldName(field_id); 5471 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5472 if (is_static) { 5473 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5474 } else { 5475 resolved = klass->FindInstanceField(name, type); 5476 } 5477 if (resolved == nullptr) { 5478 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5479 return nullptr; 5480 } 5481 } 5482 dex_cache->SetResolvedField(field_idx, resolved); 5483 return resolved; 5484} 5485 5486mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5487 uint32_t field_idx, 5488 Handle<mirror::DexCache> dex_cache, 5489 Handle<mirror::ClassLoader> class_loader) { 5490 DCHECK(dex_cache.Get() != nullptr); 5491 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5492 if (resolved != nullptr) { 5493 return resolved; 5494 } 5495 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5496 Thread* self = Thread::Current(); 5497 StackHandleScope<1> hs(self); 5498 Handle<mirror::Class> klass( 5499 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5500 if (klass.Get() == nullptr) { 5501 DCHECK(Thread::Current()->IsExceptionPending()); 5502 return nullptr; 5503 } 5504 5505 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5506 StringPiece type(dex_file.StringDataByIdx( 5507 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5508 resolved = mirror::Class::FindField(self, klass, name, type); 5509 if (resolved != nullptr) { 5510 dex_cache->SetResolvedField(field_idx, resolved); 5511 } else { 5512 ThrowNoSuchFieldError("", klass.Get(), type, name); 5513 } 5514 return resolved; 5515} 5516 5517const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5518 uint32_t* length) { 5519 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5520 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5521 const DexFile& dex_file = *dex_cache->GetDexFile(); 5522 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5523 return dex_file.GetMethodShorty(method_id, length); 5524} 5525 5526void ClassLinker::DumpAllClasses(int flags) { 5527 if (dex_cache_image_class_lookup_required_) { 5528 MoveImageClassesToClassTable(); 5529 } 5530 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5531 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5532 std::vector<mirror::Class*> all_classes; 5533 { 5534 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5535 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5536 mirror::Class* klass = it.second.Read(); 5537 all_classes.push_back(klass); 5538 } 5539 } 5540 5541 for (size_t i = 0; i < all_classes.size(); ++i) { 5542 all_classes[i]->DumpClass(std::cerr, flags); 5543 } 5544} 5545 5546static OatFile::OatMethod CreateOatMethod(const void* code, const uint8_t* gc_map, 5547 bool is_portable) { 5548 CHECK_EQ(kUsePortableCompiler, is_portable); 5549 CHECK(code != nullptr); 5550 const uint8_t* base; 5551 uint32_t code_offset, gc_map_offset; 5552 if (gc_map == nullptr) { 5553 base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code. 5554 base -= sizeof(void*); // Move backward so that code_offset != 0. 5555 code_offset = sizeof(void*); 5556 gc_map_offset = 0; 5557 } else { 5558 // TODO: 64bit support. 5559 base = nullptr; // Base of data in oat file, ie 0. 5560 code_offset = PointerToLowMemUInt32(code); 5561 gc_map_offset = PointerToLowMemUInt32(gc_map); 5562 } 5563 return OatFile::OatMethod(base, code_offset, gc_map_offset); 5564} 5565 5566bool ClassLinker::IsPortableResolutionStub(const void* entry_point) const { 5567 return (entry_point == GetPortableResolutionStub()) || 5568 (portable_resolution_trampoline_ == entry_point); 5569} 5570 5571bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const { 5572 return (entry_point == GetQuickResolutionStub()) || 5573 (quick_resolution_trampoline_ == entry_point); 5574} 5575 5576bool ClassLinker::IsPortableToInterpreterBridge(const void* entry_point) const { 5577 return (entry_point == GetPortableToInterpreterBridge()); 5578 // TODO: portable_to_interpreter_bridge_trampoline_ == entry_point; 5579} 5580 5581bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const { 5582 return (entry_point == GetQuickToInterpreterBridge()) || 5583 (quick_to_interpreter_bridge_trampoline_ == entry_point); 5584} 5585 5586bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const { 5587 return (entry_point == GetQuickGenericJniStub()) || 5588 (quick_generic_jni_trampoline_ == entry_point); 5589} 5590 5591const void* ClassLinker::GetRuntimeQuickGenericJniStub() const { 5592 return GetQuickGenericJniStub(); 5593} 5594 5595void ClassLinker::SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code, 5596 bool is_portable) const { 5597 OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr, is_portable); 5598 oat_method.LinkMethod(method); 5599 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5600 // Create bridges to transition between different kinds of compiled bridge. 5601 if (method->GetEntryPointFromPortableCompiledCode() == nullptr) { 5602 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5603 } else { 5604 CHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 5605 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 5606 method->SetIsPortableCompiled(); 5607 } 5608} 5609 5610void ClassLinker::SetEntryPointsToInterpreter(mirror::ArtMethod* method) const { 5611 if (!method->IsNative()) { 5612 method->SetEntryPointFromInterpreter(artInterpreterToInterpreterBridge); 5613 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 5614 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 5615 } else { 5616 const void* quick_method_code = GetQuickGenericJniStub(); 5617 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code, nullptr, false); 5618 oat_method.LinkMethod(method); 5619 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 5620 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 5621 } 5622} 5623 5624void ClassLinker::DumpForSigQuit(std::ostream& os) { 5625 Thread* self = Thread::Current(); 5626 if (dex_cache_image_class_lookup_required_) { 5627 ScopedObjectAccess soa(self); 5628 MoveImageClassesToClassTable(); 5629 } 5630 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 5631 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5632} 5633 5634size_t ClassLinker::NumLoadedClasses() { 5635 if (dex_cache_image_class_lookup_required_) { 5636 MoveImageClassesToClassTable(); 5637 } 5638 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5639 return class_table_.size(); 5640} 5641 5642pid_t ClassLinker::GetClassesLockOwner() { 5643 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5644} 5645 5646pid_t ClassLinker::GetDexLockOwner() { 5647 return dex_lock_.GetExclusiveOwnerTid(); 5648} 5649 5650void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5651 DCHECK(!init_done_); 5652 5653 DCHECK(klass != nullptr); 5654 DCHECK(klass->GetClassLoader() == nullptr); 5655 5656 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5657 DCHECK(class_roots != nullptr); 5658 DCHECK(class_roots->Get(class_root) == nullptr); 5659 class_roots->Set<false>(class_root, klass); 5660} 5661 5662const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) { 5663 static const char* class_roots_descriptors[] = { 5664 "Ljava/lang/Class;", 5665 "Ljava/lang/Object;", 5666 "[Ljava/lang/Class;", 5667 "[Ljava/lang/Object;", 5668 "Ljava/lang/String;", 5669 "Ljava/lang/DexCache;", 5670 "Ljava/lang/ref/Reference;", 5671 "Ljava/lang/reflect/ArtField;", 5672 "Ljava/lang/reflect/ArtMethod;", 5673 "Ljava/lang/reflect/Proxy;", 5674 "[Ljava/lang/String;", 5675 "[Ljava/lang/reflect/ArtField;", 5676 "[Ljava/lang/reflect/ArtMethod;", 5677 "Ljava/lang/ClassLoader;", 5678 "Ljava/lang/Throwable;", 5679 "Ljava/lang/ClassNotFoundException;", 5680 "Ljava/lang/StackTraceElement;", 5681 "Z", 5682 "B", 5683 "C", 5684 "D", 5685 "F", 5686 "I", 5687 "J", 5688 "S", 5689 "V", 5690 "[Z", 5691 "[B", 5692 "[C", 5693 "[D", 5694 "[F", 5695 "[I", 5696 "[J", 5697 "[S", 5698 "[Ljava/lang/StackTraceElement;", 5699 }; 5700 COMPILE_ASSERT(arraysize(class_roots_descriptors) == size_t(kClassRootsMax), 5701 mismatch_between_class_descriptors_and_class_root_enum); 5702 5703 const char* descriptor = class_roots_descriptors[class_root]; 5704 CHECK(descriptor != nullptr); 5705 return descriptor; 5706} 5707 5708} // namespace art 5709