class.cc revision ba118827465d12177f3996e50133960087b1c916
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.h" 18 19#include "android-base/stringprintf.h" 20 21#include "art_field-inl.h" 22#include "art_method-inl.h" 23#include "class_ext.h" 24#include "class_linker-inl.h" 25#include "class_loader.h" 26#include "class-inl.h" 27#include "dex_cache.h" 28#include "dex_file-inl.h" 29#include "dex_file_annotations.h" 30#include "gc/accounting/card_table-inl.h" 31#include "handle_scope-inl.h" 32#include "method.h" 33#include "object_array-inl.h" 34#include "object-inl.h" 35#include "object-refvisitor-inl.h" 36#include "object_lock.h" 37#include "runtime.h" 38#include "thread.h" 39#include "throwable.h" 40#include "utils.h" 41#include "well_known_classes.h" 42 43namespace art { 44namespace mirror { 45 46using android::base::StringPrintf; 47 48GcRoot<Class> Class::java_lang_Class_; 49 50void Class::SetClassClass(ObjPtr<Class> java_lang_Class) { 51 CHECK(java_lang_Class_.IsNull()) 52 << java_lang_Class_.Read() 53 << " " << java_lang_Class; 54 CHECK(java_lang_Class != nullptr); 55 java_lang_Class->SetClassFlags(kClassFlagClass); 56 java_lang_Class_ = GcRoot<Class>(java_lang_Class); 57} 58 59void Class::ResetClass() { 60 CHECK(!java_lang_Class_.IsNull()); 61 java_lang_Class_ = GcRoot<Class>(nullptr); 62} 63 64void Class::VisitRoots(RootVisitor* visitor) { 65 java_lang_Class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass)); 66} 67 68ClassExt* Class::EnsureExtDataPresent(Thread* self) { 69 ObjPtr<ClassExt> existing(GetExtData()); 70 if (!existing.IsNull()) { 71 return existing.Ptr(); 72 } 73 StackHandleScope<3> hs(self); 74 // Handlerize 'this' since we are allocating here. 75 Handle<Class> h_this(hs.NewHandle(this)); 76 // Clear exception so we can allocate. 77 Handle<Throwable> throwable(hs.NewHandle(self->GetException())); 78 self->ClearException(); 79 // Allocate the ClassExt 80 Handle<ClassExt> new_ext(hs.NewHandle(ClassExt::Alloc(self))); 81 if (new_ext == nullptr) { 82 // OOM allocating the classExt. 83 // TODO Should we restore the suppressed exception? 84 self->AssertPendingOOMException(); 85 return nullptr; 86 } else { 87 MemberOffset ext_offset(OFFSET_OF_OBJECT_MEMBER(Class, ext_data_)); 88 bool set; 89 // Set the ext_data_ field using CAS semantics. 90 if (Runtime::Current()->IsActiveTransaction()) { 91 set = h_this->CasFieldStrongSequentiallyConsistentObject<true>(ext_offset, 92 ObjPtr<ClassExt>(nullptr), 93 new_ext.Get()); 94 } else { 95 set = h_this->CasFieldStrongSequentiallyConsistentObject<false>(ext_offset, 96 ObjPtr<ClassExt>(nullptr), 97 new_ext.Get()); 98 } 99 ObjPtr<ClassExt> ret(set ? new_ext.Get() : h_this->GetExtData()); 100 DCHECK(!set || h_this->GetExtData() == new_ext.Get()); 101 CHECK(!ret.IsNull()); 102 // Restore the exception if there was one. 103 if (throwable != nullptr) { 104 self->SetException(throwable.Get()); 105 } 106 return ret.Ptr(); 107 } 108} 109 110void Class::SetStatus(Handle<Class> h_this, Status new_status, Thread* self) { 111 Status old_status = h_this->GetStatus(); 112 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 113 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized(); 114 if (LIKELY(class_linker_initialized)) { 115 if (UNLIKELY(new_status <= old_status && 116 new_status != kStatusErrorUnresolved && 117 new_status != kStatusErrorResolved && 118 new_status != kStatusRetired)) { 119 LOG(FATAL) << "Unexpected change back of class status for " << h_this->PrettyClass() 120 << " " << old_status << " -> " << new_status; 121 } 122 if (new_status >= kStatusResolved || old_status >= kStatusResolved) { 123 // When classes are being resolved the resolution code should hold the lock. 124 CHECK_EQ(h_this->GetLockOwnerThreadId(), self->GetThreadId()) 125 << "Attempt to change status of class while not holding its lock: " 126 << h_this->PrettyClass() << " " << old_status << " -> " << new_status; 127 } 128 } 129 if (UNLIKELY(IsErroneous(new_status))) { 130 CHECK(!h_this->IsErroneous()) 131 << "Attempt to set as erroneous an already erroneous class " 132 << h_this->PrettyClass() 133 << " old_status: " << old_status << " new_status: " << new_status; 134 CHECK_EQ(new_status == kStatusErrorResolved, old_status >= kStatusResolved); 135 if (VLOG_IS_ON(class_linker)) { 136 LOG(ERROR) << "Setting " << h_this->PrettyDescriptor() << " to erroneous."; 137 if (self->IsExceptionPending()) { 138 LOG(ERROR) << "Exception: " << self->GetException()->Dump(); 139 } 140 } 141 142 ObjPtr<ClassExt> ext(h_this->EnsureExtDataPresent(self)); 143 if (!ext.IsNull()) { 144 self->AssertPendingException(); 145 ext->SetVerifyError(self->GetException()); 146 } else { 147 self->AssertPendingOOMException(); 148 } 149 self->AssertPendingException(); 150 } 151 152 static_assert(sizeof(Status) == sizeof(uint32_t), "Size of status not equal to uint32"); 153 if (Runtime::Current()->IsActiveTransaction()) { 154 h_this->SetField32Volatile<true>(StatusOffset(), new_status); 155 } else { 156 h_this->SetField32Volatile<false>(StatusOffset(), new_status); 157 } 158 159 // Setting the object size alloc fast path needs to be after the status write so that if the 160 // alloc path sees a valid object size, we would know that it's initialized as long as it has a 161 // load-acquire/fake dependency. 162 if (new_status == kStatusInitialized && !h_this->IsVariableSize()) { 163 DCHECK_EQ(h_this->GetObjectSizeAllocFastPath(), std::numeric_limits<uint32_t>::max()); 164 // Finalizable objects must always go slow path. 165 if (!h_this->IsFinalizable()) { 166 h_this->SetObjectSizeAllocFastPath(RoundUp(h_this->GetObjectSize(), kObjectAlignment)); 167 } 168 } 169 170 if (!class_linker_initialized) { 171 // When the class linker is being initialized its single threaded and by definition there can be 172 // no waiters. During initialization classes may appear temporary but won't be retired as their 173 // size was statically computed. 174 } else { 175 // Classes that are being resolved or initialized need to notify waiters that the class status 176 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 177 if (h_this->IsTemp()) { 178 // Class is a temporary one, ensure that waiters for resolution get notified of retirement 179 // so that they can grab the new version of the class from the class linker's table. 180 CHECK_LT(new_status, kStatusResolved) << h_this->PrettyDescriptor(); 181 if (new_status == kStatusRetired || new_status == kStatusErrorUnresolved) { 182 h_this->NotifyAll(self); 183 } 184 } else { 185 CHECK_NE(new_status, kStatusRetired); 186 if (old_status >= kStatusResolved || new_status >= kStatusResolved) { 187 h_this->NotifyAll(self); 188 } 189 } 190 } 191} 192 193void Class::SetDexCache(ObjPtr<DexCache> new_dex_cache) { 194 SetFieldObjectTransaction(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 195} 196 197void Class::SetClassSize(uint32_t new_class_size) { 198 if (kIsDebugBuild && new_class_size < GetClassSize()) { 199 DumpClass(LOG_STREAM(FATAL_WITHOUT_ABORT), kDumpClassFullDetail); 200 LOG(FATAL_WITHOUT_ABORT) << new_class_size << " vs " << GetClassSize(); 201 LOG(FATAL) << "class=" << PrettyTypeOf(); 202 } 203 SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 204} 205 206// Return the class' name. The exact format is bizarre, but it's the specified behavior for 207// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 208// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 209// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 210String* Class::ComputeName(Handle<Class> h_this) { 211 String* name = h_this->GetName(); 212 if (name != nullptr) { 213 return name; 214 } 215 std::string temp; 216 const char* descriptor = h_this->GetDescriptor(&temp); 217 Thread* self = Thread::Current(); 218 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 219 // The descriptor indicates that this is the class for 220 // a primitive type; special-case the return value. 221 const char* c_name = nullptr; 222 switch (descriptor[0]) { 223 case 'Z': c_name = "boolean"; break; 224 case 'B': c_name = "byte"; break; 225 case 'C': c_name = "char"; break; 226 case 'S': c_name = "short"; break; 227 case 'I': c_name = "int"; break; 228 case 'J': c_name = "long"; break; 229 case 'F': c_name = "float"; break; 230 case 'D': c_name = "double"; break; 231 case 'V': c_name = "void"; break; 232 default: 233 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 234 } 235 name = String::AllocFromModifiedUtf8(self, c_name); 236 } else { 237 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 238 // components. 239 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str()); 240 } 241 h_this->SetName(name); 242 return name; 243} 244 245void Class::DumpClass(std::ostream& os, int flags) { 246 if ((flags & kDumpClassFullDetail) == 0) { 247 os << PrettyClass(); 248 if ((flags & kDumpClassClassLoader) != 0) { 249 os << ' ' << GetClassLoader(); 250 } 251 if ((flags & kDumpClassInitialized) != 0) { 252 os << ' ' << GetStatus(); 253 } 254 os << "\n"; 255 return; 256 } 257 258 Thread* const self = Thread::Current(); 259 StackHandleScope<2> hs(self); 260 Handle<Class> h_this(hs.NewHandle(this)); 261 Handle<Class> h_super(hs.NewHandle(GetSuperClass())); 262 auto image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize(); 263 264 std::string temp; 265 os << "----- " << (IsInterface() ? "interface" : "class") << " " 266 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n", 267 os << " objectSize=" << SizeOf() << " " 268 << "(" << (h_super != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 269 os << StringPrintf(" access=0x%04x.%04x\n", 270 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 271 if (h_super != nullptr) { 272 os << " super='" << h_super->PrettyClass() << "' (cl=" << h_super->GetClassLoader() 273 << ")\n"; 274 } 275 if (IsArrayClass()) { 276 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 277 } 278 const size_t num_direct_interfaces = NumDirectInterfaces(); 279 if (num_direct_interfaces > 0) { 280 os << " interfaces (" << num_direct_interfaces << "):\n"; 281 for (size_t i = 0; i < num_direct_interfaces; ++i) { 282 ObjPtr<Class> interface = GetDirectInterface(self, h_this.Get(), i); 283 if (interface == nullptr) { 284 os << StringPrintf(" %2zd: nullptr!\n", i); 285 } else { 286 ObjPtr<ClassLoader> cl = interface->GetClassLoader(); 287 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl.Ptr()); 288 } 289 } 290 } 291 if (!IsLoaded()) { 292 os << " class not yet loaded"; 293 } else { 294 // After this point, this may have moved due to GetDirectInterface. 295 os << " vtable (" << h_this->NumVirtualMethods() << " entries, " 296 << (h_super != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n"; 297 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 298 os << StringPrintf(" %2zd: %s\n", i, ArtMethod::PrettyMethod( 299 h_this->GetVirtualMethodDuringLinking(i, image_pointer_size)).c_str()); 300 } 301 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n"; 302 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) { 303 os << StringPrintf(" %2zd: %s\n", i, ArtMethod::PrettyMethod( 304 h_this->GetDirectMethod(i, image_pointer_size)).c_str()); 305 } 306 if (h_this->NumStaticFields() > 0) { 307 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 308 if (h_this->IsResolved()) { 309 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 310 os << StringPrintf(" %2zd: %s\n", i, 311 ArtField::PrettyField(h_this->GetStaticField(i)).c_str()); 312 } 313 } else { 314 os << " <not yet available>"; 315 } 316 } 317 if (h_this->NumInstanceFields() > 0) { 318 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 319 if (h_this->IsResolved()) { 320 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 321 os << StringPrintf(" %2zd: %s\n", i, 322 ArtField::PrettyField(h_this->GetInstanceField(i)).c_str()); 323 } 324 } else { 325 os << " <not yet available>"; 326 } 327 } 328 } 329} 330 331void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 332 if (kIsDebugBuild && new_reference_offsets != kClassWalkSuper) { 333 // Sanity check that the number of bits set in the reference offset bitmap 334 // agrees with the number of references 335 uint32_t count = 0; 336 for (ObjPtr<Class> c = this; c != nullptr; c = c->GetSuperClass()) { 337 count += c->NumReferenceInstanceFieldsDuringLinking(); 338 } 339 // +1 for the Class in Object. 340 CHECK_EQ(static_cast<uint32_t>(POPCOUNT(new_reference_offsets)) + 1, count); 341 } 342 // Not called within a transaction. 343 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 344 new_reference_offsets); 345} 346 347bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 348 size_t i = 0; 349 size_t min_length = std::min(descriptor1.size(), descriptor2.size()); 350 while (i < min_length && descriptor1[i] == descriptor2[i]) { 351 ++i; 352 } 353 if (descriptor1.find('/', i) != StringPiece::npos || 354 descriptor2.find('/', i) != StringPiece::npos) { 355 return false; 356 } else { 357 return true; 358 } 359} 360 361bool Class::IsInSamePackage(ObjPtr<Class> that) { 362 ObjPtr<Class> klass1 = this; 363 ObjPtr<Class> klass2 = that; 364 if (klass1 == klass2) { 365 return true; 366 } 367 // Class loaders must match. 368 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 369 return false; 370 } 371 // Arrays are in the same package when their element classes are. 372 while (klass1->IsArrayClass()) { 373 klass1 = klass1->GetComponentType(); 374 } 375 while (klass2->IsArrayClass()) { 376 klass2 = klass2->GetComponentType(); 377 } 378 // trivial check again for array types 379 if (klass1 == klass2) { 380 return true; 381 } 382 // Compare the package part of the descriptor string. 383 std::string temp1, temp2; 384 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 385} 386 387bool Class::IsThrowableClass() { 388 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 389} 390 391void Class::SetClassLoader(ObjPtr<ClassLoader> new_class_loader) { 392 if (Runtime::Current()->IsActiveTransaction()) { 393 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 394 } else { 395 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 396 } 397} 398 399template <typename SignatureType> 400static inline ArtMethod* FindInterfaceMethodWithSignature(ObjPtr<Class> klass, 401 const StringPiece& name, 402 const SignatureType& signature, 403 PointerSize pointer_size) 404 REQUIRES_SHARED(Locks::mutator_lock_) { 405 // If the current class is not an interface, skip the search of its declared methods; 406 // such lookup is used only to distinguish between IncompatibleClassChangeError and 407 // NoSuchMethodError and the caller has already tried to search methods in the class. 408 if (LIKELY(klass->IsInterface())) { 409 // Search declared methods, both direct and virtual. 410 // (This lookup is used also for invoke-static on interface classes.) 411 for (ArtMethod& method : klass->GetDeclaredMethodsSlice(pointer_size)) { 412 if (method.GetName() == name && method.GetSignature() == signature) { 413 return &method; 414 } 415 } 416 } 417 418 // TODO: If there is a unique maximally-specific non-abstract superinterface method, 419 // we should return it, otherwise an arbitrary one can be returned. 420 ObjPtr<IfTable> iftable = klass->GetIfTable(); 421 for (int32_t i = 0, iftable_count = iftable->Count(); i < iftable_count; ++i) { 422 ObjPtr<Class> iface = iftable->GetInterface(i); 423 for (ArtMethod& method : iface->GetVirtualMethodsSlice(pointer_size)) { 424 if (method.GetName() == name && method.GetSignature() == signature) { 425 return &method; 426 } 427 } 428 } 429 430 // Then search for public non-static methods in the java.lang.Object. 431 if (LIKELY(klass->IsInterface())) { 432 ObjPtr<Class> object_class = klass->GetSuperClass(); 433 DCHECK(object_class->IsObjectClass()); 434 for (ArtMethod& method : object_class->GetDeclaredMethodsSlice(pointer_size)) { 435 if (method.IsPublic() && !method.IsStatic() && 436 method.GetName() == name && method.GetSignature() == signature) { 437 return &method; 438 } 439 } 440 } 441 return nullptr; 442} 443 444ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, 445 const StringPiece& signature, 446 PointerSize pointer_size) { 447 return FindInterfaceMethodWithSignature(this, name, signature, pointer_size); 448} 449 450ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, 451 const Signature& signature, 452 PointerSize pointer_size) { 453 return FindInterfaceMethodWithSignature(this, name, signature, pointer_size); 454} 455 456ArtMethod* Class::FindInterfaceMethod(ObjPtr<DexCache> dex_cache, 457 uint32_t dex_method_idx, 458 PointerSize pointer_size) { 459 // We always search by name and signature, ignoring the type index in the MethodId. 460 const DexFile& dex_file = *dex_cache->GetDexFile(); 461 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 462 StringPiece name = dex_file.StringDataByIdx(method_id.name_idx_); 463 const Signature signature = dex_file.GetMethodSignature(method_id); 464 return FindInterfaceMethod(name, signature, pointer_size); 465} 466 467static inline bool IsInheritedMethod(ObjPtr<mirror::Class> klass, 468 ObjPtr<mirror::Class> declaring_class, 469 ArtMethod& method) 470 REQUIRES_SHARED(Locks::mutator_lock_) { 471 DCHECK_EQ(declaring_class, method.GetDeclaringClass()); 472 DCHECK_NE(klass, declaring_class); 473 DCHECK(klass->IsArrayClass() ? declaring_class->IsObjectClass() 474 : klass->IsSubClass(declaring_class)); 475 uint32_t access_flags = method.GetAccessFlags(); 476 if ((access_flags & (kAccPublic | kAccProtected)) != 0) { 477 return true; 478 } 479 if ((access_flags & kAccPrivate) != 0) { 480 return false; 481 } 482 for (; klass != declaring_class; klass = klass->GetSuperClass()) { 483 if (!klass->IsInSamePackage(declaring_class)) { 484 return false; 485 } 486 } 487 return true; 488} 489 490template <typename SignatureType> 491static inline ArtMethod* FindClassMethodWithSignature(ObjPtr<Class> this_klass, 492 const StringPiece& name, 493 const SignatureType& signature, 494 PointerSize pointer_size) 495 REQUIRES_SHARED(Locks::mutator_lock_) { 496 // Search declared methods first. 497 for (ArtMethod& method : this_klass->GetDeclaredMethodsSlice(pointer_size)) { 498 ArtMethod* np_method = method.GetInterfaceMethodIfProxy(pointer_size); 499 if (np_method->GetName() == name && np_method->GetSignature() == signature) { 500 return &method; 501 } 502 } 503 504 // Then search the superclass chain. If we find an inherited method, return it. 505 // If we find a method that's not inherited because of access restrictions, 506 // try to find a method inherited from an interface in copied methods. 507 ObjPtr<Class> klass = this_klass->GetSuperClass(); 508 ArtMethod* uninherited_method = nullptr; 509 for (; klass != nullptr; klass = klass->GetSuperClass()) { 510 DCHECK(!klass->IsProxyClass()); 511 for (ArtMethod& method : klass->GetDeclaredMethodsSlice(pointer_size)) { 512 if (method.GetName() == name && method.GetSignature() == signature) { 513 if (IsInheritedMethod(this_klass, klass, method)) { 514 return &method; 515 } 516 uninherited_method = &method; 517 break; 518 } 519 } 520 if (uninherited_method != nullptr) { 521 break; 522 } 523 } 524 525 // Then search copied methods. 526 // If we found a method that's not inherited, stop the search in its declaring class. 527 ObjPtr<Class> end_klass = klass; 528 DCHECK_EQ(uninherited_method != nullptr, end_klass != nullptr); 529 klass = this_klass; 530 if (UNLIKELY(klass->IsProxyClass())) { 531 DCHECK(klass->GetCopiedMethodsSlice(pointer_size).empty()); 532 klass = klass->GetSuperClass(); 533 } 534 for (; klass != end_klass; klass = klass->GetSuperClass()) { 535 DCHECK(!klass->IsProxyClass()); 536 for (ArtMethod& method : klass->GetCopiedMethodsSlice(pointer_size)) { 537 if (method.GetName() == name && method.GetSignature() == signature) { 538 return &method; // No further check needed, copied methods are inherited by definition. 539 } 540 } 541 } 542 return uninherited_method; // Return the `uninherited_method` if any. 543} 544 545 546ArtMethod* Class::FindClassMethod(const StringPiece& name, 547 const StringPiece& signature, 548 PointerSize pointer_size) { 549 return FindClassMethodWithSignature(this, name, signature, pointer_size); 550} 551 552ArtMethod* Class::FindClassMethod(const StringPiece& name, 553 const Signature& signature, 554 PointerSize pointer_size) { 555 return FindClassMethodWithSignature(this, name, signature, pointer_size); 556} 557 558ArtMethod* Class::FindClassMethod(ObjPtr<DexCache> dex_cache, 559 uint32_t dex_method_idx, 560 PointerSize pointer_size) { 561 // FIXME: Hijacking a proxy class by a custom class loader can break this assumption. 562 DCHECK(!IsProxyClass()); 563 564 // First try to find a declared method by dex_method_idx if we have a dex_cache match. 565 ObjPtr<DexCache> this_dex_cache = GetDexCache(); 566 if (this_dex_cache == dex_cache) { 567 // Lookup is always performed in the class referenced by the MethodId. 568 DCHECK_EQ(dex_type_idx_, GetDexFile().GetMethodId(dex_method_idx).class_idx_.index_); 569 for (ArtMethod& method : GetDeclaredMethodsSlice(pointer_size)) { 570 if (method.GetDexMethodIndex() == dex_method_idx) { 571 return &method; 572 } 573 } 574 } 575 // If not found, we need to search by name and signature. 576 const DexFile& dex_file = *dex_cache->GetDexFile(); 577 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 578 const Signature signature = dex_file.GetMethodSignature(method_id); 579 StringPiece name; // Delay strlen() until actually needed. 580 // If we do not have a dex_cache match, try to find the declared method in this class now. 581 if (this_dex_cache != dex_cache && !GetDeclaredMethodsSlice(pointer_size).empty()) { 582 DCHECK(name.empty()); 583 name = dex_file.StringDataByIdx(method_id.name_idx_); 584 for (ArtMethod& method : GetDeclaredMethodsSlice(pointer_size)) { 585 if (method.GetName() == name && method.GetSignature() == signature) { 586 return &method; 587 } 588 } 589 } 590 591 // Then search the superclass chain. If we find an inherited method, return it. 592 // If we find a method that's not inherited because of access restrictions, 593 // try to find a method inherited from an interface in copied methods. 594 ArtMethod* uninherited_method = nullptr; 595 ObjPtr<Class> klass = GetSuperClass(); 596 for (; klass != nullptr; klass = klass->GetSuperClass()) { 597 ArtMethod* candidate_method = nullptr; 598 ArraySlice<ArtMethod> declared_methods = klass->GetDeclaredMethodsSlice(pointer_size); 599 if (klass->GetDexCache() == dex_cache) { 600 // Matching dex_cache. We cannot compare the `dex_method_idx` anymore because 601 // the type index differs, so compare the name index and proto index. 602 for (ArtMethod& method : declared_methods) { 603 const DexFile::MethodId& cmp_method_id = dex_file.GetMethodId(method.GetDexMethodIndex()); 604 if (cmp_method_id.name_idx_ == method_id.name_idx_ && 605 cmp_method_id.proto_idx_ == method_id.proto_idx_) { 606 candidate_method = &method; 607 break; 608 } 609 } 610 } else { 611 if (!declared_methods.empty() && name.empty()) { 612 name = dex_file.StringDataByIdx(method_id.name_idx_); 613 } 614 for (ArtMethod& method : declared_methods) { 615 if (method.GetName() == name && method.GetSignature() == signature) { 616 candidate_method = &method; 617 break; 618 } 619 } 620 } 621 if (candidate_method != nullptr) { 622 if (IsInheritedMethod(this, klass, *candidate_method)) { 623 return candidate_method; 624 } else { 625 uninherited_method = candidate_method; 626 break; 627 } 628 } 629 } 630 631 // Then search copied methods. 632 // If we found a method that's not inherited, stop the search in its declaring class. 633 ObjPtr<Class> end_klass = klass; 634 DCHECK_EQ(uninherited_method != nullptr, end_klass != nullptr); 635 // After we have searched the declared methods of the super-class chain, 636 // search copied methods which can contain methods from interfaces. 637 for (klass = this; klass != end_klass; klass = klass->GetSuperClass()) { 638 ArraySlice<ArtMethod> copied_methods = klass->GetCopiedMethodsSlice(pointer_size); 639 if (!copied_methods.empty() && name.empty()) { 640 name = dex_file.StringDataByIdx(method_id.name_idx_); 641 } 642 for (ArtMethod& method : copied_methods) { 643 if (method.GetName() == name && method.GetSignature() == signature) { 644 return &method; // No further check needed, copied methods are inherited by definition. 645 } 646 } 647 } 648 return uninherited_method; // Return the `uninherited_method` if any. 649} 650 651ArtMethod* Class::FindConstructor(const StringPiece& signature, PointerSize pointer_size) { 652 // Internal helper, never called on proxy classes. We can skip GetInterfaceMethodIfProxy(). 653 DCHECK(!IsProxyClass()); 654 StringPiece name("<init>"); 655 for (ArtMethod& method : GetDirectMethodsSliceUnchecked(pointer_size)) { 656 if (method.GetName() == name && method.GetSignature() == signature) { 657 return &method; 658 } 659 } 660 return nullptr; 661} 662 663ArtMethod* Class::FindDeclaredDirectMethodByName(const StringPiece& name, 664 PointerSize pointer_size) { 665 for (auto& method : GetDirectMethods(pointer_size)) { 666 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 667 if (name == np_method->GetName()) { 668 return &method; 669 } 670 } 671 return nullptr; 672} 673 674ArtMethod* Class::FindDeclaredVirtualMethodByName(const StringPiece& name, 675 PointerSize pointer_size) { 676 for (auto& method : GetVirtualMethods(pointer_size)) { 677 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 678 if (name == np_method->GetName()) { 679 return &method; 680 } 681 } 682 return nullptr; 683} 684 685ArtMethod* Class::FindVirtualMethodForInterfaceSuper(ArtMethod* method, PointerSize pointer_size) { 686 DCHECK(method->GetDeclaringClass()->IsInterface()); 687 DCHECK(IsInterface()) << "Should only be called on a interface class"; 688 // Check if we have one defined on this interface first. This includes searching copied ones to 689 // get any conflict methods. Conflict methods are copied into each subtype from the supertype. We 690 // don't do any indirect method checks here. 691 for (ArtMethod& iface_method : GetVirtualMethods(pointer_size)) { 692 if (method->HasSameNameAndSignature(&iface_method)) { 693 return &iface_method; 694 } 695 } 696 697 std::vector<ArtMethod*> abstract_methods; 698 // Search through the IFTable for a working version. We don't need to check for conflicts 699 // because if there was one it would appear in this classes virtual_methods_ above. 700 701 Thread* self = Thread::Current(); 702 StackHandleScope<2> hs(self); 703 MutableHandle<IfTable> iftable(hs.NewHandle(GetIfTable())); 704 MutableHandle<Class> iface(hs.NewHandle<Class>(nullptr)); 705 size_t iftable_count = GetIfTableCount(); 706 // Find the method. We don't need to check for conflicts because they would have been in the 707 // copied virtuals of this interface. Order matters, traverse in reverse topological order; most 708 // subtypiest interfaces get visited first. 709 for (size_t k = iftable_count; k != 0;) { 710 k--; 711 DCHECK_LT(k, iftable->Count()); 712 iface.Assign(iftable->GetInterface(k)); 713 // Iterate through every declared method on this interface. Each direct method's name/signature 714 // is unique so the order of the inner loop doesn't matter. 715 for (auto& method_iter : iface->GetDeclaredVirtualMethods(pointer_size)) { 716 ArtMethod* current_method = &method_iter; 717 if (current_method->HasSameNameAndSignature(method)) { 718 if (current_method->IsDefault()) { 719 // Handle JLS soft errors, a default method from another superinterface tree can 720 // "override" an abstract method(s) from another superinterface tree(s). To do this, 721 // ignore any [default] method which are dominated by the abstract methods we've seen so 722 // far. Check if overridden by any in abstract_methods. We do not need to check for 723 // default_conflicts because we would hit those before we get to this loop. 724 bool overridden = false; 725 for (ArtMethod* possible_override : abstract_methods) { 726 DCHECK(possible_override->HasSameNameAndSignature(current_method)); 727 if (iface->IsAssignableFrom(possible_override->GetDeclaringClass())) { 728 overridden = true; 729 break; 730 } 731 } 732 if (!overridden) { 733 return current_method; 734 } 735 } else { 736 // Is not default. 737 // This might override another default method. Just stash it for now. 738 abstract_methods.push_back(current_method); 739 } 740 } 741 } 742 } 743 // If we reach here we either never found any declaration of the method (in which case 744 // 'abstract_methods' is empty or we found no non-overriden default methods in which case 745 // 'abstract_methods' contains a number of abstract implementations of the methods. We choose one 746 // of these arbitrarily. 747 return abstract_methods.empty() ? nullptr : abstract_methods[0]; 748} 749 750ArtMethod* Class::FindClassInitializer(PointerSize pointer_size) { 751 for (ArtMethod& method : GetDirectMethods(pointer_size)) { 752 if (method.IsClassInitializer()) { 753 DCHECK_STREQ(method.GetName(), "<clinit>"); 754 DCHECK_STREQ(method.GetSignature().ToString().c_str(), "()V"); 755 return &method; 756 } 757 } 758 return nullptr; 759} 760 761// Custom binary search to avoid double comparisons from std::binary_search. 762static ArtField* FindFieldByNameAndType(LengthPrefixedArray<ArtField>* fields, 763 const StringPiece& name, 764 const StringPiece& type) 765 REQUIRES_SHARED(Locks::mutator_lock_) { 766 if (fields == nullptr) { 767 return nullptr; 768 } 769 size_t low = 0; 770 size_t high = fields->size(); 771 ArtField* ret = nullptr; 772 while (low < high) { 773 size_t mid = (low + high) / 2; 774 ArtField& field = fields->At(mid); 775 // Fields are sorted by class, then name, then type descriptor. This is verified in dex file 776 // verifier. There can be multiple fields with the same in the same class name due to proguard. 777 int result = StringPiece(field.GetName()).Compare(name); 778 if (result == 0) { 779 result = StringPiece(field.GetTypeDescriptor()).Compare(type); 780 } 781 if (result < 0) { 782 low = mid + 1; 783 } else if (result > 0) { 784 high = mid; 785 } else { 786 ret = &field; 787 break; 788 } 789 } 790 if (kIsDebugBuild) { 791 ArtField* found = nullptr; 792 for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) { 793 if (name == field.GetName() && type == field.GetTypeDescriptor()) { 794 found = &field; 795 break; 796 } 797 } 798 CHECK_EQ(found, ret) << "Found " << found->PrettyField() << " vs " << ret->PrettyField(); 799 } 800 return ret; 801} 802 803ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 804 // Binary search by name. Interfaces are not relevant because they can't contain instance fields. 805 return FindFieldByNameAndType(GetIFieldsPtr(), name, type); 806} 807 808ArtField* Class::FindDeclaredInstanceField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) { 809 if (GetDexCache() == dex_cache) { 810 for (ArtField& field : GetIFields()) { 811 if (field.GetDexFieldIndex() == dex_field_idx) { 812 return &field; 813 } 814 } 815 } 816 return nullptr; 817} 818 819ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 820 // Is the field in this class, or any of its superclasses? 821 // Interfaces are not relevant because they can't contain instance fields. 822 for (ObjPtr<Class> c = this; c != nullptr; c = c->GetSuperClass()) { 823 ArtField* f = c->FindDeclaredInstanceField(name, type); 824 if (f != nullptr) { 825 return f; 826 } 827 } 828 return nullptr; 829} 830 831ArtField* Class::FindInstanceField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) { 832 // Is the field in this class, or any of its superclasses? 833 // Interfaces are not relevant because they can't contain instance fields. 834 for (ObjPtr<Class> c = this; c != nullptr; c = c->GetSuperClass()) { 835 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 836 if (f != nullptr) { 837 return f; 838 } 839 } 840 return nullptr; 841} 842 843ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 844 DCHECK(type != nullptr); 845 return FindFieldByNameAndType(GetSFieldsPtr(), name, type); 846} 847 848ArtField* Class::FindDeclaredStaticField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) { 849 if (dex_cache == GetDexCache()) { 850 for (ArtField& field : GetSFields()) { 851 if (field.GetDexFieldIndex() == dex_field_idx) { 852 return &field; 853 } 854 } 855 } 856 return nullptr; 857} 858 859ArtField* Class::FindStaticField(Thread* self, 860 ObjPtr<Class> klass, 861 const StringPiece& name, 862 const StringPiece& type) { 863 // Is the field in this class (or its interfaces), or any of its 864 // superclasses (or their interfaces)? 865 for (ObjPtr<Class> k = klass; k != nullptr; k = k->GetSuperClass()) { 866 // Is the field in this class? 867 ArtField* f = k->FindDeclaredStaticField(name, type); 868 if (f != nullptr) { 869 return f; 870 } 871 // Is this field in any of this class' interfaces? 872 for (uint32_t i = 0, num_interfaces = k->NumDirectInterfaces(); i != num_interfaces; ++i) { 873 ObjPtr<Class> interface = GetDirectInterface(self, k, i); 874 DCHECK(interface != nullptr); 875 f = FindStaticField(self, interface, name, type); 876 if (f != nullptr) { 877 return f; 878 } 879 } 880 } 881 return nullptr; 882} 883 884ArtField* Class::FindStaticField(Thread* self, 885 ObjPtr<Class> klass, 886 ObjPtr<DexCache> dex_cache, 887 uint32_t dex_field_idx) { 888 for (ObjPtr<Class> k = klass; k != nullptr; k = k->GetSuperClass()) { 889 // Is the field in this class? 890 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 891 if (f != nullptr) { 892 return f; 893 } 894 // Though GetDirectInterface() should not cause thread suspension when called 895 // from here, it takes a Handle as an argument, so we need to wrap `k`. 896 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 897 // Is this field in any of this class' interfaces? 898 for (uint32_t i = 0, num_interfaces = k->NumDirectInterfaces(); i != num_interfaces; ++i) { 899 ObjPtr<Class> interface = GetDirectInterface(self, k, i); 900 DCHECK(interface != nullptr); 901 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 902 if (f != nullptr) { 903 return f; 904 } 905 } 906 } 907 return nullptr; 908} 909 910ArtField* Class::FindField(Thread* self, 911 ObjPtr<Class> klass, 912 const StringPiece& name, 913 const StringPiece& type) { 914 // Find a field using the JLS field resolution order 915 for (ObjPtr<Class> k = klass; k != nullptr; k = k->GetSuperClass()) { 916 // Is the field in this class? 917 ArtField* f = k->FindDeclaredInstanceField(name, type); 918 if (f != nullptr) { 919 return f; 920 } 921 f = k->FindDeclaredStaticField(name, type); 922 if (f != nullptr) { 923 return f; 924 } 925 // Is this field in any of this class' interfaces? 926 for (uint32_t i = 0, num_interfaces = k->NumDirectInterfaces(); i != num_interfaces; ++i) { 927 ObjPtr<Class> interface = GetDirectInterface(self, k, i); 928 DCHECK(interface != nullptr); 929 f = FindStaticField(self, interface, name, type); 930 if (f != nullptr) { 931 return f; 932 } 933 } 934 } 935 return nullptr; 936} 937 938void Class::SetSkipAccessChecksFlagOnAllMethods(PointerSize pointer_size) { 939 DCHECK(IsVerified()); 940 for (auto& m : GetMethods(pointer_size)) { 941 if (!m.IsNative() && m.IsInvokable()) { 942 m.SetSkipAccessChecks(); 943 } 944 } 945} 946 947const char* Class::GetDescriptor(std::string* storage) { 948 if (IsPrimitive()) { 949 return Primitive::Descriptor(GetPrimitiveType()); 950 } else if (IsArrayClass()) { 951 return GetArrayDescriptor(storage); 952 } else if (IsProxyClass()) { 953 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 954 return storage->c_str(); 955 } else { 956 const DexFile& dex_file = GetDexFile(); 957 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 958 return dex_file.GetTypeDescriptor(type_id); 959 } 960} 961 962const char* Class::GetArrayDescriptor(std::string* storage) { 963 std::string temp; 964 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 965 *storage = "["; 966 *storage += elem_desc; 967 return storage->c_str(); 968} 969 970const DexFile::ClassDef* Class::GetClassDef() { 971 uint16_t class_def_idx = GetDexClassDefIndex(); 972 if (class_def_idx == DexFile::kDexNoIndex16) { 973 return nullptr; 974 } 975 return &GetDexFile().GetClassDef(class_def_idx); 976} 977 978dex::TypeIndex Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 979 DCHECK(!IsPrimitive()); 980 DCHECK(!IsArrayClass()); 981 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 982} 983 984ObjPtr<Class> Class::GetDirectInterface(Thread* self, ObjPtr<Class> klass, uint32_t idx) { 985 DCHECK(klass != nullptr); 986 DCHECK(!klass->IsPrimitive()); 987 if (klass->IsArrayClass()) { 988 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 989 // Use ClassLinker::LookupClass(); avoid poisoning ObjPtr<>s by ClassLinker::FindSystemClass(). 990 ObjPtr<Class> interface; 991 if (idx == 0) { 992 interface = class_linker->LookupClass(self, "Ljava/lang/Cloneable;", nullptr); 993 } else { 994 DCHECK_EQ(1U, idx); 995 interface = class_linker->LookupClass(self, "Ljava/io/Serializable;", nullptr); 996 } 997 DCHECK(interface != nullptr); 998 return interface; 999 } else if (klass->IsProxyClass()) { 1000 ObjPtr<ObjectArray<Class>> interfaces = klass->GetProxyInterfaces(); 1001 DCHECK(interfaces != nullptr); 1002 return interfaces->Get(idx); 1003 } else { 1004 dex::TypeIndex type_idx = klass->GetDirectInterfaceTypeIdx(idx); 1005 ObjPtr<Class> interface = ClassLinker::LookupResolvedType( 1006 type_idx, klass->GetDexCache(), klass->GetClassLoader()); 1007 return interface; 1008 } 1009} 1010 1011ObjPtr<Class> Class::ResolveDirectInterface(Thread* self, Handle<Class> klass, uint32_t idx) { 1012 ObjPtr<Class> interface = GetDirectInterface(self, klass.Get(), idx); 1013 if (interface == nullptr) { 1014 DCHECK(!klass->IsArrayClass()); 1015 DCHECK(!klass->IsProxyClass()); 1016 dex::TypeIndex type_idx = klass->GetDirectInterfaceTypeIdx(idx); 1017 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), 1018 type_idx, 1019 klass.Get()); 1020 CHECK(interface != nullptr || self->IsExceptionPending()); 1021 } 1022 return interface; 1023} 1024 1025ObjPtr<Class> Class::GetCommonSuperClass(Handle<Class> klass) { 1026 DCHECK(klass != nullptr); 1027 DCHECK(!klass->IsInterface()); 1028 DCHECK(!IsInterface()); 1029 ObjPtr<Class> common_super_class = this; 1030 while (!common_super_class->IsAssignableFrom(klass.Get())) { 1031 ObjPtr<Class> old_common = common_super_class; 1032 common_super_class = old_common->GetSuperClass(); 1033 DCHECK(common_super_class != nullptr) << old_common->PrettyClass(); 1034 } 1035 return common_super_class; 1036} 1037 1038const char* Class::GetSourceFile() { 1039 const DexFile& dex_file = GetDexFile(); 1040 const DexFile::ClassDef* dex_class_def = GetClassDef(); 1041 if (dex_class_def == nullptr) { 1042 // Generated classes have no class def. 1043 return nullptr; 1044 } 1045 return dex_file.GetSourceFile(*dex_class_def); 1046} 1047 1048std::string Class::GetLocation() { 1049 ObjPtr<DexCache> dex_cache = GetDexCache(); 1050 if (dex_cache != nullptr && !IsProxyClass()) { 1051 return dex_cache->GetLocation()->ToModifiedUtf8(); 1052 } 1053 // Arrays and proxies are generated and have no corresponding dex file location. 1054 return "generated class"; 1055} 1056 1057const DexFile::TypeList* Class::GetInterfaceTypeList() { 1058 const DexFile::ClassDef* class_def = GetClassDef(); 1059 if (class_def == nullptr) { 1060 return nullptr; 1061 } 1062 return GetDexFile().GetInterfacesList(*class_def); 1063} 1064 1065void Class::PopulateEmbeddedVTable(PointerSize pointer_size) { 1066 PointerArray* table = GetVTableDuringLinking(); 1067 CHECK(table != nullptr) << PrettyClass(); 1068 const size_t table_length = table->GetLength(); 1069 SetEmbeddedVTableLength(table_length); 1070 for (size_t i = 0; i < table_length; i++) { 1071 SetEmbeddedVTableEntry(i, table->GetElementPtrSize<ArtMethod*>(i, pointer_size), pointer_size); 1072 } 1073 // Keep java.lang.Object class's vtable around for since it's easier 1074 // to be reused by array classes during their linking. 1075 if (!IsObjectClass()) { 1076 SetVTable(nullptr); 1077 } 1078} 1079 1080class ReadBarrierOnNativeRootsVisitor { 1081 public: 1082 void operator()(ObjPtr<Object> obj ATTRIBUTE_UNUSED, 1083 MemberOffset offset ATTRIBUTE_UNUSED, 1084 bool is_static ATTRIBUTE_UNUSED) const {} 1085 1086 void VisitRootIfNonNull(CompressedReference<Object>* root) const 1087 REQUIRES_SHARED(Locks::mutator_lock_) { 1088 if (!root->IsNull()) { 1089 VisitRoot(root); 1090 } 1091 } 1092 1093 void VisitRoot(CompressedReference<Object>* root) const 1094 REQUIRES_SHARED(Locks::mutator_lock_) { 1095 ObjPtr<Object> old_ref = root->AsMirrorPtr(); 1096 ObjPtr<Object> new_ref = ReadBarrier::BarrierForRoot(root); 1097 if (old_ref != new_ref) { 1098 // Update the field atomically. This may fail if mutator updates before us, but it's ok. 1099 auto* atomic_root = 1100 reinterpret_cast<Atomic<CompressedReference<Object>>*>(root); 1101 atomic_root->CompareExchangeStrongSequentiallyConsistent( 1102 CompressedReference<Object>::FromMirrorPtr(old_ref.Ptr()), 1103 CompressedReference<Object>::FromMirrorPtr(new_ref.Ptr())); 1104 } 1105 } 1106}; 1107 1108// The pre-fence visitor for Class::CopyOf(). 1109class CopyClassVisitor { 1110 public: 1111 CopyClassVisitor(Thread* self, 1112 Handle<Class>* orig, 1113 size_t new_length, 1114 size_t copy_bytes, 1115 ImTable* imt, 1116 PointerSize pointer_size) 1117 : self_(self), orig_(orig), new_length_(new_length), 1118 copy_bytes_(copy_bytes), imt_(imt), pointer_size_(pointer_size) { 1119 } 1120 1121 void operator()(ObjPtr<Object> obj, size_t usable_size ATTRIBUTE_UNUSED) const 1122 REQUIRES_SHARED(Locks::mutator_lock_) { 1123 StackHandleScope<1> hs(self_); 1124 Handle<mirror::Class> h_new_class_obj(hs.NewHandle(obj->AsClass())); 1125 Object::CopyObject(h_new_class_obj.Get(), orig_->Get(), copy_bytes_); 1126 Class::SetStatus(h_new_class_obj, Class::kStatusResolving, self_); 1127 h_new_class_obj->PopulateEmbeddedVTable(pointer_size_); 1128 h_new_class_obj->SetImt(imt_, pointer_size_); 1129 h_new_class_obj->SetClassSize(new_length_); 1130 // Visit all of the references to make sure there is no from space references in the native 1131 // roots. 1132 ObjPtr<Object>(h_new_class_obj.Get())->VisitReferences( 1133 ReadBarrierOnNativeRootsVisitor(), VoidFunctor()); 1134 } 1135 1136 private: 1137 Thread* const self_; 1138 Handle<Class>* const orig_; 1139 const size_t new_length_; 1140 const size_t copy_bytes_; 1141 ImTable* imt_; 1142 const PointerSize pointer_size_; 1143 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 1144}; 1145 1146Class* Class::CopyOf(Thread* self, int32_t new_length, ImTable* imt, PointerSize pointer_size) { 1147 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 1148 // We may get copied by a compacting GC. 1149 StackHandleScope<1> hs(self); 1150 Handle<Class> h_this(hs.NewHandle(this)); 1151 gc::Heap* heap = Runtime::Current()->GetHeap(); 1152 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 1153 // to skip copying the tail part that we will overwrite here. 1154 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt, pointer_size); 1155 ObjPtr<Object> new_class = kMovingClasses ? 1156 heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) : 1157 heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 1158 if (UNLIKELY(new_class == nullptr)) { 1159 self->AssertPendingOOMException(); 1160 return nullptr; 1161 } 1162 return new_class->AsClass(); 1163} 1164 1165bool Class::ProxyDescriptorEquals(const char* match) { 1166 DCHECK(IsProxyClass()); 1167 return Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this) == match; 1168} 1169 1170// TODO: Move this to java_lang_Class.cc? 1171ArtMethod* Class::GetDeclaredConstructor( 1172 Thread* self, Handle<ObjectArray<Class>> args, PointerSize pointer_size) { 1173 for (auto& m : GetDirectMethods(pointer_size)) { 1174 // Skip <clinit> which is a static constructor, as well as non constructors. 1175 if (m.IsStatic() || !m.IsConstructor()) { 1176 continue; 1177 } 1178 // May cause thread suspension and exceptions. 1179 if (m.GetInterfaceMethodIfProxy(kRuntimePointerSize)->EqualParameters(args)) { 1180 return &m; 1181 } 1182 if (UNLIKELY(self->IsExceptionPending())) { 1183 return nullptr; 1184 } 1185 } 1186 return nullptr; 1187} 1188 1189uint32_t Class::Depth() { 1190 uint32_t depth = 0; 1191 for (ObjPtr<Class> klass = this; klass->GetSuperClass() != nullptr; klass = klass->GetSuperClass()) { 1192 depth++; 1193 } 1194 return depth; 1195} 1196 1197dex::TypeIndex Class::FindTypeIndexInOtherDexFile(const DexFile& dex_file) { 1198 std::string temp; 1199 const DexFile::TypeId* type_id = dex_file.FindTypeId(GetDescriptor(&temp)); 1200 return (type_id == nullptr) ? dex::TypeIndex() : dex_file.GetIndexForTypeId(*type_id); 1201} 1202 1203template <PointerSize kPointerSize, bool kTransactionActive> 1204ObjPtr<Method> Class::GetDeclaredMethodInternal( 1205 Thread* self, 1206 ObjPtr<Class> klass, 1207 ObjPtr<String> name, 1208 ObjPtr<ObjectArray<Class>> args) { 1209 // Covariant return types permit the class to define multiple 1210 // methods with the same name and parameter types. Prefer to 1211 // return a non-synthetic method in such situations. We may 1212 // still return a synthetic method to handle situations like 1213 // escalated visibility. We never return miranda methods that 1214 // were synthesized by the runtime. 1215 constexpr uint32_t kSkipModifiers = kAccMiranda | kAccSynthetic; 1216 StackHandleScope<3> hs(self); 1217 auto h_method_name = hs.NewHandle(name); 1218 if (UNLIKELY(h_method_name == nullptr)) { 1219 ThrowNullPointerException("name == null"); 1220 return nullptr; 1221 } 1222 auto h_args = hs.NewHandle(args); 1223 Handle<Class> h_klass = hs.NewHandle(klass); 1224 ArtMethod* result = nullptr; 1225 for (auto& m : h_klass->GetDeclaredVirtualMethods(kPointerSize)) { 1226 auto* np_method = m.GetInterfaceMethodIfProxy(kPointerSize); 1227 // May cause thread suspension. 1228 ObjPtr<String> np_name = np_method->GetNameAsString(self); 1229 if (!np_name->Equals(h_method_name.Get()) || !np_method->EqualParameters(h_args)) { 1230 if (UNLIKELY(self->IsExceptionPending())) { 1231 return nullptr; 1232 } 1233 continue; 1234 } 1235 auto modifiers = m.GetAccessFlags(); 1236 if ((modifiers & kSkipModifiers) == 0) { 1237 return Method::CreateFromArtMethod<kPointerSize, kTransactionActive>(self, &m); 1238 } 1239 if ((modifiers & kAccMiranda) == 0) { 1240 result = &m; // Remember as potential result if it's not a miranda method. 1241 } 1242 } 1243 if (result == nullptr) { 1244 for (auto& m : h_klass->GetDirectMethods(kPointerSize)) { 1245 auto modifiers = m.GetAccessFlags(); 1246 if ((modifiers & kAccConstructor) != 0) { 1247 continue; 1248 } 1249 auto* np_method = m.GetInterfaceMethodIfProxy(kPointerSize); 1250 // May cause thread suspension. 1251 ObjPtr<String> np_name = np_method->GetNameAsString(self); 1252 if (np_name == nullptr) { 1253 self->AssertPendingException(); 1254 return nullptr; 1255 } 1256 if (!np_name->Equals(h_method_name.Get()) || !np_method->EqualParameters(h_args)) { 1257 if (UNLIKELY(self->IsExceptionPending())) { 1258 return nullptr; 1259 } 1260 continue; 1261 } 1262 if ((modifiers & kSkipModifiers) == 0) { 1263 return Method::CreateFromArtMethod<kPointerSize, kTransactionActive>(self, &m); 1264 } 1265 // Direct methods cannot be miranda methods, so this potential result must be synthetic. 1266 result = &m; 1267 } 1268 } 1269 return result != nullptr 1270 ? Method::CreateFromArtMethod<kPointerSize, kTransactionActive>(self, result) 1271 : nullptr; 1272} 1273 1274template 1275ObjPtr<Method> Class::GetDeclaredMethodInternal<PointerSize::k32, false>( 1276 Thread* self, 1277 ObjPtr<Class> klass, 1278 ObjPtr<String> name, 1279 ObjPtr<ObjectArray<Class>> args); 1280template 1281ObjPtr<Method> Class::GetDeclaredMethodInternal<PointerSize::k32, true>( 1282 Thread* self, 1283 ObjPtr<Class> klass, 1284 ObjPtr<String> name, 1285 ObjPtr<ObjectArray<Class>> args); 1286template 1287ObjPtr<Method> Class::GetDeclaredMethodInternal<PointerSize::k64, false>( 1288 Thread* self, 1289 ObjPtr<Class> klass, 1290 ObjPtr<String> name, 1291 ObjPtr<ObjectArray<Class>> args); 1292template 1293ObjPtr<Method> Class::GetDeclaredMethodInternal<PointerSize::k64, true>( 1294 Thread* self, 1295 ObjPtr<Class> klass, 1296 ObjPtr<String> name, 1297 ObjPtr<ObjectArray<Class>> args); 1298 1299template <PointerSize kPointerSize, bool kTransactionActive> 1300ObjPtr<Constructor> Class::GetDeclaredConstructorInternal( 1301 Thread* self, 1302 ObjPtr<Class> klass, 1303 ObjPtr<ObjectArray<Class>> args) { 1304 StackHandleScope<1> hs(self); 1305 ArtMethod* result = klass->GetDeclaredConstructor(self, hs.NewHandle(args), kPointerSize); 1306 return result != nullptr 1307 ? Constructor::CreateFromArtMethod<kPointerSize, kTransactionActive>(self, result) 1308 : nullptr; 1309} 1310 1311// Constructor::CreateFromArtMethod<kTransactionActive>(self, result) 1312 1313template 1314ObjPtr<Constructor> Class::GetDeclaredConstructorInternal<PointerSize::k32, false>( 1315 Thread* self, 1316 ObjPtr<Class> klass, 1317 ObjPtr<ObjectArray<Class>> args); 1318template 1319ObjPtr<Constructor> Class::GetDeclaredConstructorInternal<PointerSize::k32, true>( 1320 Thread* self, 1321 ObjPtr<Class> klass, 1322 ObjPtr<ObjectArray<Class>> args); 1323template 1324ObjPtr<Constructor> Class::GetDeclaredConstructorInternal<PointerSize::k64, false>( 1325 Thread* self, 1326 ObjPtr<Class> klass, 1327 ObjPtr<ObjectArray<Class>> args); 1328template 1329ObjPtr<Constructor> Class::GetDeclaredConstructorInternal<PointerSize::k64, true>( 1330 Thread* self, 1331 ObjPtr<Class> klass, 1332 ObjPtr<ObjectArray<Class>> args); 1333 1334int32_t Class::GetInnerClassFlags(Handle<Class> h_this, int32_t default_value) { 1335 if (h_this->IsProxyClass() || h_this->GetDexCache() == nullptr) { 1336 return default_value; 1337 } 1338 uint32_t flags; 1339 if (!annotations::GetInnerClassFlags(h_this, &flags)) { 1340 return default_value; 1341 } 1342 return flags; 1343} 1344 1345void Class::SetObjectSizeAllocFastPath(uint32_t new_object_size) { 1346 if (Runtime::Current()->IsActiveTransaction()) { 1347 SetField32Volatile<true>(ObjectSizeAllocFastPathOffset(), new_object_size); 1348 } else { 1349 SetField32Volatile<false>(ObjectSizeAllocFastPathOffset(), new_object_size); 1350 } 1351} 1352 1353std::string Class::PrettyDescriptor(ObjPtr<mirror::Class> klass) { 1354 if (klass == nullptr) { 1355 return "null"; 1356 } 1357 return klass->PrettyDescriptor(); 1358} 1359 1360std::string Class::PrettyDescriptor() { 1361 std::string temp; 1362 return art::PrettyDescriptor(GetDescriptor(&temp)); 1363} 1364 1365std::string Class::PrettyClass(ObjPtr<mirror::Class> c) { 1366 if (c == nullptr) { 1367 return "null"; 1368 } 1369 return c->PrettyClass(); 1370} 1371 1372std::string Class::PrettyClass() { 1373 std::string result; 1374 result += "java.lang.Class<"; 1375 result += PrettyDescriptor(); 1376 result += ">"; 1377 return result; 1378} 1379 1380std::string Class::PrettyClassAndClassLoader(ObjPtr<mirror::Class> c) { 1381 if (c == nullptr) { 1382 return "null"; 1383 } 1384 return c->PrettyClassAndClassLoader(); 1385} 1386 1387std::string Class::PrettyClassAndClassLoader() { 1388 std::string result; 1389 result += "java.lang.Class<"; 1390 result += PrettyDescriptor(); 1391 result += ","; 1392 result += mirror::Object::PrettyTypeOf(GetClassLoader()); 1393 // TODO: add an identifying hash value for the loader 1394 result += ">"; 1395 return result; 1396} 1397 1398template<VerifyObjectFlags kVerifyFlags> void Class::GetAccessFlagsDCheck() { 1399 // Check class is loaded/retired or this is java.lang.String that has a 1400 // circularity issue during loading the names of its members 1401 DCHECK(IsIdxLoaded<kVerifyFlags>() || IsRetired<kVerifyFlags>() || 1402 IsErroneous<static_cast<VerifyObjectFlags>(kVerifyFlags & ~kVerifyThis)>() || 1403 this == String::GetJavaLangString()) 1404 << "IsIdxLoaded=" << IsIdxLoaded<kVerifyFlags>() 1405 << " IsRetired=" << IsRetired<kVerifyFlags>() 1406 << " IsErroneous=" << 1407 IsErroneous<static_cast<VerifyObjectFlags>(kVerifyFlags & ~kVerifyThis)>() 1408 << " IsString=" << (this == String::GetJavaLangString()) 1409 << " status= " << GetStatus<kVerifyFlags>() 1410 << " descriptor=" << PrettyDescriptor(); 1411} 1412// Instantiate the common cases. 1413template void Class::GetAccessFlagsDCheck<kVerifyNone>(); 1414template void Class::GetAccessFlagsDCheck<kVerifyThis>(); 1415template void Class::GetAccessFlagsDCheck<kVerifyReads>(); 1416template void Class::GetAccessFlagsDCheck<kVerifyWrites>(); 1417template void Class::GetAccessFlagsDCheck<kVerifyAll>(); 1418 1419} // namespace mirror 1420} // namespace art 1421