| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_RUNTIME_CLASS_LINKER_INL_H_ |
| #define ART_RUNTIME_CLASS_LINKER_INL_H_ |
| |
| #include <atomic> |
| |
| #include "android-base/thread_annotations.h" |
| #include "art_field-inl.h" |
| #include "art_method-inl.h" |
| #include "base/mutex.h" |
| #include "class_linker.h" |
| #include "class_table-inl.h" |
| #include "dex/dex_file-inl.h" |
| #include "dex/dex_file_structs.h" |
| #include "gc_root-inl.h" |
| #include "handle_scope-inl.h" |
| #include "jni/jni_internal.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/dex_cache-inl.h" |
| #include "mirror/iftable.h" |
| #include "mirror/object_array-inl.h" |
| #include "obj_ptr-inl.h" |
| #include "scoped_thread_state_change-inl.h" |
| |
| namespace art HIDDEN { |
| |
| inline ObjPtr<mirror::Class> ClassLinker::FindArrayClass(Thread* self, |
| ObjPtr<mirror::Class> element_class) { |
| for (size_t i = 0; i < kFindArrayCacheSize; ++i) { |
| // Read the cached array class once to avoid races with other threads setting it. |
| ObjPtr<mirror::Class> array_class = |
| find_array_class_cache_[i].load(std::memory_order_acquire).Read(); |
| if (array_class != nullptr && array_class->GetComponentType() == element_class) { |
| return array_class; |
| } |
| } |
| std::string descriptor = "["; |
| std::string temp; |
| descriptor += element_class->GetDescriptor(&temp); |
| StackHandleScope<1> hs(Thread::Current()); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle(element_class->GetClassLoader())); |
| ObjPtr<mirror::Class> array_class = |
| FindClass(self, descriptor.c_str(), descriptor.length(), class_loader); |
| if (array_class != nullptr) { |
| // Benign races in storing array class and incrementing index. |
| size_t victim_index = find_array_class_cache_next_victim_; |
| find_array_class_cache_[victim_index].store(GcRoot<mirror::Class>(array_class), |
| std::memory_order_release); |
| find_array_class_cache_next_victim_ = (victim_index + 1) % kFindArrayCacheSize; |
| } else { |
| // We should have a NoClassDefFoundError. |
| self->AssertPendingException(); |
| } |
| return array_class; |
| } |
| |
| inline ObjPtr<mirror::String> ClassLinker::ResolveString(dex::StringIndex string_idx, |
| ArtField* referrer) { |
| Thread::PoisonObjectPointersIfDebug(); |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); |
| ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx); |
| if (resolved == nullptr) { |
| resolved = DoResolveString(string_idx, dex_cache); |
| } |
| return resolved; |
| } |
| |
| inline ObjPtr<mirror::String> ClassLinker::ResolveString(dex::StringIndex string_idx, |
| ArtMethod* referrer) { |
| Thread::PoisonObjectPointersIfDebug(); |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); |
| ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx); |
| if (resolved == nullptr) { |
| resolved = DoResolveString(string_idx, dex_cache); |
| } |
| return resolved; |
| } |
| |
| inline ObjPtr<mirror::String> ClassLinker::ResolveString(dex::StringIndex string_idx, |
| Handle<mirror::DexCache> dex_cache) { |
| Thread::PoisonObjectPointersIfDebug(); |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx); |
| if (resolved == nullptr) { |
| resolved = DoResolveString(string_idx, dex_cache); |
| } |
| return resolved; |
| } |
| |
| inline ObjPtr<mirror::String> ClassLinker::LookupString(dex::StringIndex string_idx, |
| ObjPtr<mirror::DexCache> dex_cache) { |
| ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx); |
| if (resolved == nullptr) { |
| resolved = DoLookupString(string_idx, dex_cache); |
| } |
| return resolved; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::ResolveType(dex::TypeIndex type_idx, |
| ObjPtr<mirror::Class> referrer) { |
| if (kObjPtrPoisoning) { |
| StackHandleScope<1> hs(Thread::Current()); |
| HandleWrapperObjPtr<mirror::Class> referrer_wrapper = hs.NewHandleWrapper(&referrer); |
| Thread::Current()->PoisonObjectPointers(); |
| } |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::Class> resolved_type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (resolved_type == nullptr) { |
| resolved_type = DoResolveType(type_idx, referrer); |
| } |
| return resolved_type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::ResolveType(dex::TypeIndex type_idx, |
| ArtField* referrer) { |
| Thread::PoisonObjectPointersIfDebug(); |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::Class> resolved_type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (UNLIKELY(resolved_type == nullptr)) { |
| resolved_type = DoResolveType(type_idx, referrer); |
| } |
| return resolved_type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::ResolveType(dex::TypeIndex type_idx, |
| ArtMethod* referrer) { |
| Thread::PoisonObjectPointersIfDebug(); |
| DCHECK(!Thread::Current()->IsExceptionPending()); |
| ObjPtr<mirror::Class> resolved_type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (UNLIKELY(resolved_type == nullptr)) { |
| resolved_type = DoResolveType(type_idx, referrer); |
| } |
| return resolved_type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::ResolveType(dex::TypeIndex type_idx, |
| Handle<mirror::DexCache> dex_cache, |
| Handle<mirror::ClassLoader> class_loader) { |
| DCHECK(dex_cache != nullptr); |
| DCHECK(dex_cache->GetClassLoader() == class_loader.Get()); |
| Thread::PoisonObjectPointersIfDebug(); |
| ObjPtr<mirror::Class> resolved = dex_cache->GetResolvedType(type_idx); |
| if (resolved == nullptr) { |
| resolved = DoResolveType(type_idx, dex_cache, class_loader); |
| } |
| return resolved; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::LookupResolvedType(dex::TypeIndex type_idx, |
| ObjPtr<mirror::Class> referrer) { |
| ObjPtr<mirror::Class> type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (type == nullptr) { |
| type = DoLookupResolvedType(type_idx, referrer); |
| } |
| return type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::LookupResolvedType(dex::TypeIndex type_idx, |
| ArtField* referrer) { |
| // We do not need the read barrier for getting the DexCache for the initial resolved type |
| // lookup as both from-space and to-space copies point to the same native resolved types array. |
| ObjPtr<mirror::Class> type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (type == nullptr) { |
| type = DoLookupResolvedType(type_idx, referrer->GetDeclaringClass()); |
| } |
| return type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::LookupResolvedType(dex::TypeIndex type_idx, |
| ArtMethod* referrer) { |
| // We do not need the read barrier for getting the DexCache for the initial resolved type |
| // lookup as both from-space and to-space copies point to the same native resolved types array. |
| ObjPtr<mirror::Class> type = referrer->GetDexCache()->GetResolvedType(type_idx); |
| if (type == nullptr) { |
| type = DoLookupResolvedType(type_idx, referrer->GetDeclaringClass()); |
| } |
| return type; |
| } |
| |
| inline ObjPtr<mirror::Class> ClassLinker::LookupResolvedType( |
| dex::TypeIndex type_idx, |
| ObjPtr<mirror::DexCache> dex_cache, |
| ObjPtr<mirror::ClassLoader> class_loader) { |
| DCHECK(dex_cache->GetClassLoader() == class_loader); |
| ObjPtr<mirror::Class> type = dex_cache->GetResolvedType(type_idx); |
| if (type == nullptr) { |
| type = DoLookupResolvedType(type_idx, dex_cache, class_loader); |
| } |
| return type; |
| } |
| |
| inline ArtMethod* ClassLinker::LookupResolvedMethod(uint32_t method_idx, |
| ObjPtr<mirror::DexCache> dex_cache, |
| ObjPtr<mirror::ClassLoader> class_loader) { |
| DCHECK(dex_cache->GetClassLoader() == class_loader); |
| ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); |
| if (resolved == nullptr) { |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| const dex::MethodId& method_id = dex_file.GetMethodId(method_idx); |
| ObjPtr<mirror::Class> klass = LookupResolvedType(method_id.class_idx_, dex_cache, class_loader); |
| if (klass != nullptr) { |
| resolved = FindResolvedMethod(klass, dex_cache, class_loader, method_idx); |
| } |
| } |
| return resolved; |
| } |
| |
| inline ArtMethod* ClassLinker::ResolveMethodId(uint32_t method_idx, ArtMethod* referrer) { |
| ArtMethod* resolved = referrer->GetDexCache()->GetResolvedMethod(method_idx); |
| if (resolved != nullptr) { |
| DCHECK(!resolved->IsRuntimeMethod()); |
| DCHECK(resolved->GetDeclaringClassUnchecked() != nullptr) << resolved->GetDexMethodIndex(); |
| return resolved; |
| } |
| // Fail, get the declaring class. |
| referrer = referrer->GetInterfaceMethodIfProxy(image_pointer_size_); |
| const dex::MethodId& method_id = referrer->GetDexFile()->GetMethodId(method_idx); |
| ObjPtr<mirror::Class> klass = ResolveType(method_id.class_idx_, referrer); |
| if (klass == nullptr) { |
| Thread::Current()->AssertPendingException(); |
| return nullptr; |
| } |
| |
| resolved = |
| FindResolvedMethod(klass, referrer->GetDexCache(), referrer->GetClassLoader(), method_idx); |
| if (resolved != nullptr) { |
| return resolved; |
| } |
| |
| const char* name = referrer->GetDexFile()->GetStringData(method_id.name_idx_); |
| const Signature signature = referrer->GetDexFile()->GetMethodSignature(method_id); |
| ThrowNoSuchMethodError(klass, name, signature); |
| return nullptr; |
| } |
| |
| inline bool ClassLinker::ThrowIfInvokeClassMismatch(ObjPtr<mirror::Class> klass, |
| const DexFile& dex_file, |
| InvokeType type) { |
| if (type == kInterface) { |
| if (UNLIKELY(!klass->IsInterface())) { |
| ThrowIncompatibleClassChangeError(klass, |
| "Found class %s, but interface was expected", |
| klass->PrettyDescriptor().c_str()); |
| return true; |
| } |
| } else if (type == kVirtual) { |
| if (UNLIKELY(klass->IsInterface())) { |
| ThrowIncompatibleClassChangeError(klass, |
| "Found interface %s, but class was expected", |
| klass->PrettyDescriptor().c_str()); |
| return true; |
| } |
| } else if (type == kDirect) { |
| if (UNLIKELY(klass->IsInterface()) && !dex_file.SupportsDefaultMethods()) { |
| ThrowIncompatibleClassChangeError(klass, |
| "Found interface %s, but class was expected", |
| klass->PrettyDescriptor().c_str()); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| inline ArtMethod* ClassLinker::ResolveMethodWithChecks(uint32_t method_idx, |
| ArtMethod* referrer, |
| InvokeType type) { |
| DCHECK(referrer != nullptr); |
| DCHECK_IMPLIES(referrer->IsProxyMethod(), referrer->IsConstructor()); |
| |
| // For a Proxy constructor, we need to do the lookup in the context of the original method |
| // from where it steals the code. |
| referrer = referrer->GetInterfaceMethodIfProxy(image_pointer_size_); |
| |
| const dex::MethodId& method_id = referrer->GetDexFile()->GetMethodId(method_idx); |
| ObjPtr<mirror::Class> klass = ResolveType(method_id.class_idx_, referrer); |
| if (klass == nullptr || ThrowIfInvokeClassMismatch(klass, *referrer->GetDexFile(), type)) { |
| DCHECK(Thread::Current()->IsExceptionPending()); |
| return nullptr; |
| } |
| |
| ArtMethod* resolved = referrer->GetDexCache()->GetResolvedMethod(method_idx); |
| if (resolved == nullptr) { |
| resolved = FindResolvedMethod(klass, |
| referrer->GetDexCache(), |
| referrer->GetDexCache()->GetClassLoader(), |
| method_idx); |
| } |
| |
| if (resolved != nullptr) { |
| ObjPtr<mirror::Class> methods_class = resolved->GetDeclaringClass(); |
| ObjPtr<mirror::Class> referring_class = referrer->GetDeclaringClass(); |
| if (UNLIKELY(!referring_class->CanAccess(methods_class))) { |
| // The referrer class can't access the method's declaring class but may still be able |
| // to access the method if the MethodId specifies an accessible subclass of the declaring |
| // class rather than the declaring class itself. |
| if (UNLIKELY(!referring_class->CanAccess(klass))) { |
| ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, |
| klass, |
| resolved, |
| type); |
| return nullptr; |
| } |
| } |
| if (UNLIKELY(!referring_class->CanAccessMember(methods_class, resolved->GetAccessFlags()))) { |
| ThrowIllegalAccessErrorMethod(referring_class, resolved); |
| return nullptr; |
| } |
| |
| if (LIKELY(!resolved->CheckIncompatibleClassChange(type))) { |
| return resolved; |
| } |
| } else { |
| resolved = FindIncompatibleMethod(klass, |
| referrer->GetDexCache(), |
| referrer->GetDexCache()->GetClassLoader(), |
| method_idx); |
| } |
| if (resolved != nullptr) { |
| ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer); |
| return nullptr; |
| } |
| |
| // We failed to find the method (using all lookup types), so throw a NoSuchMethodError. |
| const char* name = referrer->GetDexFile()->GetStringData(method_id.name_idx_); |
| const Signature signature = referrer->GetDexFile()->GetMethodSignature(method_id); |
| ThrowNoSuchMethodError(type, klass, name, signature); |
| return nullptr; |
| } |
| |
| inline ArtField* ClassLinker::LookupResolvedField(uint32_t field_idx, |
| ArtMethod* referrer, |
| bool is_static) { |
| ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); |
| ArtField* field = dex_cache->GetResolvedField(field_idx); |
| if (field == nullptr) { |
| referrer = referrer->GetInterfaceMethodIfProxy(image_pointer_size_); |
| ObjPtr<mirror::ClassLoader> class_loader = referrer->GetDeclaringClass()->GetClassLoader(); |
| field = LookupResolvedField(field_idx, dex_cache, class_loader, is_static); |
| } |
| return field; |
| } |
| |
| inline ArtField* ClassLinker::ResolveField(uint32_t field_idx, |
| ArtMethod* referrer, |
| bool is_static) { |
| Thread::PoisonObjectPointersIfDebug(); |
| ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); |
| ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); |
| // If `resolved_field->IsStatic()` is different than `is_static` we know that we will return |
| // nullptr. In this case we still fall into the if case below and make the call in order to throw |
| // the right exception. |
| if (UNLIKELY(resolved_field == nullptr || resolved_field->IsStatic() != is_static)) { |
| StackHandleScope<2> hs(Thread::Current()); |
| referrer = referrer->GetInterfaceMethodIfProxy(image_pointer_size_); |
| ObjPtr<mirror::Class> referring_class = referrer->GetDeclaringClass(); |
| Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(dex_cache)); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referring_class->GetClassLoader())); |
| resolved_field = ResolveField(field_idx, h_dex_cache, class_loader, is_static); |
| // Note: We cannot check here to see whether we added the field to the cache. The type |
| // might be an erroneous class, which results in it being hidden from us. |
| } |
| return resolved_field; |
| } |
| |
| inline ArtField* ClassLinker::ResolveField(uint32_t field_idx, |
| Handle<mirror::DexCache> dex_cache, |
| Handle<mirror::ClassLoader> class_loader, |
| bool is_static) { |
| DCHECK(dex_cache != nullptr); |
| DCHECK(dex_cache->GetClassLoader().Ptr() == class_loader.Get()); |
| DCHECK(!Thread::Current()->IsExceptionPending()) << Thread::Current()->GetException()->Dump(); |
| ArtField* resolved = dex_cache->GetResolvedField(field_idx); |
| Thread::PoisonObjectPointersIfDebug(); |
| |
| // If `resolved->IsStatic()` is different than `is_static` we know that we will return |
| // nullptr. In this case we still continue forward in order to throw the right exception. |
| if (resolved != nullptr && resolved->IsStatic() == is_static) { |
| return resolved; |
| } |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| const dex::FieldId& field_id = dex_file.GetFieldId(field_idx); |
| ObjPtr<mirror::Class> klass = ResolveType(field_id.class_idx_, dex_cache, class_loader); |
| if (klass == nullptr) { |
| DCHECK(Thread::Current()->IsExceptionPending()); |
| return nullptr; |
| } |
| |
| // Look for the field again in case the type resolution updated the cache. |
| resolved = dex_cache->GetResolvedField(field_idx); |
| if (resolved != nullptr && resolved->IsStatic() == is_static) { |
| return resolved; |
| } |
| |
| resolved = FindResolvedField(klass, dex_cache.Get(), class_loader.Get(), field_idx, is_static); |
| if (resolved == nullptr) { |
| const char* name = dex_file.GetFieldName(field_id); |
| const char* type = dex_file.GetFieldTypeDescriptor(field_id); |
| ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); |
| } |
| return resolved; |
| } |
| |
| template <typename Visitor> |
| inline void ClassLinker::VisitBootClasses(Visitor* visitor) { |
| boot_class_table_->Visit(*visitor); |
| } |
| |
| template <class Visitor> |
| inline void ClassLinker::VisitClassTables(const Visitor& visitor) { |
| Thread* const self = Thread::Current(); |
| WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); |
| for (const ClassLoaderData& data : class_loaders_) { |
| if (data.class_table != nullptr) { |
| visitor(data.class_table); |
| } |
| } |
| } |
| |
| template <ReadBarrierOption kReadBarrierOption> |
| inline ObjPtr<mirror::ObjectArray<mirror::Class>> ClassLinker::GetClassRoots() { |
| ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots = |
| class_roots_.Read<kReadBarrierOption>(); |
| DCHECK(class_roots != nullptr); |
| return class_roots; |
| } |
| |
| template <typename Visitor> |
| void ClassLinker::VisitKnownDexFiles(Thread* self, Visitor visitor) { |
| ReaderMutexLock rmu(self, *Locks::dex_lock_); |
| std::for_each(dex_caches_.begin(), |
| dex_caches_.end(), |
| [&](const auto& entry) REQUIRES(Locks::mutator_lock_) { |
| visitor(/*dex_file=*/entry.first); |
| }); |
| } |
| |
| } // namespace art |
| |
| #endif // ART_RUNTIME_CLASS_LINKER_INL_H_ |
