| /* |
| * 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 "art_field.h" |
| #include "class_linker.h" |
| #include "gc_root-inl.h" |
| #include "gc/heap-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/dex_cache-inl.h" |
| #include "mirror/iftable.h" |
| #include "mirror/object_array.h" |
| #include "handle_scope-inl.h" |
| |
| #include <atomic> |
| |
| namespace art { |
| |
| inline mirror::Class* ClassLinker::FindSystemClass(Thread* self, const char* descriptor) { |
| return FindClass(self, descriptor, ScopedNullHandle<mirror::ClassLoader>()); |
| } |
| |
| inline mirror::Class* ClassLinker::FindArrayClass(Thread* self, 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. |
| mirror::Class* array_class = find_array_class_cache_[i].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<2> hs(Thread::Current()); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle((*element_class)->GetClassLoader())); |
| HandleWrapper<mirror::Class> h_element_class(hs.NewHandleWrapper(element_class)); |
| mirror::Class* array_class = FindClass(self, descriptor.c_str(), 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] = GcRoot<mirror::Class>(array_class); |
| find_array_class_cache_next_victim_ = (victim_index + 1) % kFindArrayCacheSize; |
| } else { |
| // We should have a NoClassDefFoundError. |
| self->AssertPendingException(); |
| } |
| return array_class; |
| } |
| |
| inline mirror::String* ClassLinker::ResolveString(uint32_t string_idx, ArtMethod* referrer) { |
| mirror::Class* declaring_class = referrer->GetDeclaringClass(); |
| // MethodVerifier refuses methods with string_idx out of bounds. |
| DCHECK_LT(string_idx, declaring_class->GetDexFile().NumStringIds());; |
| mirror::String* string = |
| mirror::StringDexCachePair::LookupString(declaring_class->GetDexCacheStrings(), |
| string_idx, |
| mirror::DexCache::kDexCacheStringCacheSize).Read(); |
| if (UNLIKELY(string == nullptr)) { |
| StackHandleScope<1> hs(Thread::Current()); |
| Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| string = ResolveString(dex_file, string_idx, dex_cache); |
| if (string != nullptr) { |
| DCHECK_EQ(dex_cache->GetResolvedString(string_idx), string); |
| } |
| } |
| return string; |
| } |
| |
| inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, ArtMethod* referrer) { |
| mirror::Class* resolved_type = referrer->GetDexCacheResolvedType(type_idx, image_pointer_size_); |
| if (UNLIKELY(resolved_type == nullptr)) { |
| mirror::Class* declaring_class = referrer->GetDeclaringClass(); |
| StackHandleScope<2> hs(Thread::Current()); |
| Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader); |
| // Note: We cannot check here to see whether we added the type to the cache. The type |
| // might be an erroneous class, which results in it being hidden from us. |
| } |
| return resolved_type; |
| } |
| |
| inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, ArtField* referrer) { |
| mirror::Class* declaring_class = referrer->GetDeclaringClass(); |
| mirror::DexCache* dex_cache_ptr = declaring_class->GetDexCache(); |
| mirror::Class* resolved_type = dex_cache_ptr->GetResolvedType(type_idx); |
| if (UNLIKELY(resolved_type == nullptr)) { |
| StackHandleScope<2> hs(Thread::Current()); |
| Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_cache_ptr)); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader); |
| // Note: We cannot check here to see whether we added the type to the cache. The type |
| // might be an erroneous class, which results in it being hidden from us. |
| } |
| return resolved_type; |
| } |
| |
| inline ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx, ArtMethod* referrer) { |
| ArtMethod* resolved_method = referrer->GetDexCacheResolvedMethod(method_idx, image_pointer_size_); |
| if (resolved_method == nullptr || resolved_method->IsRuntimeMethod()) { |
| return nullptr; |
| } |
| return resolved_method; |
| } |
| |
| inline mirror::Class* ClassLinker::ResolveReferencedClassOfMethod( |
| uint32_t method_idx, |
| Handle<mirror::DexCache> dex_cache, |
| Handle<mirror::ClassLoader> class_loader) { |
| // NB: We cannot simply use `GetResolvedMethod(method_idx, ...)->GetDeclaringClass()`. This is |
| // because if we did so than an invoke-super could be incorrectly dispatched in cases where |
| // GetMethodId(method_idx).class_idx_ refers to a non-interface, non-direct-superclass |
| // (super*-class?) of the referrer and the direct superclass of the referrer contains a concrete |
| // implementation of the method. If this class's implementation of the method is copied from an |
| // interface (either miranda, default or conflict) we would incorrectly assume that is what we |
| // want to invoke on, instead of the 'concrete' implementation that the direct superclass |
| // contains. |
| const DexFile* dex_file = dex_cache->GetDexFile(); |
| const DexFile::MethodId& method = dex_file->GetMethodId(method_idx); |
| mirror::Class* resolved_type = dex_cache->GetResolvedType(method.class_idx_); |
| if (UNLIKELY(resolved_type == nullptr)) { |
| resolved_type = ResolveType(*dex_file, method.class_idx_, dex_cache, class_loader); |
| } |
| return resolved_type; |
| } |
| |
| template <ClassLinker::ResolveMode kResolveMode> |
| inline ArtMethod* ClassLinker::ResolveMethod(Thread* self, |
| uint32_t method_idx, |
| ArtMethod* referrer, |
| InvokeType type) { |
| ArtMethod* resolved_method = GetResolvedMethod(method_idx, referrer); |
| if (UNLIKELY(resolved_method == nullptr)) { |
| mirror::Class* declaring_class = referrer->GetDeclaringClass(); |
| StackHandleScope<2> hs(self); |
| Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(declaring_class->GetDexCache())); |
| Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(declaring_class->GetClassLoader())); |
| const DexFile* dex_file = h_dex_cache->GetDexFile(); |
| resolved_method = ResolveMethod<kResolveMode>(*dex_file, |
| method_idx, |
| h_dex_cache, |
| h_class_loader, |
| referrer, |
| type); |
| } |
| // Note: We cannot check here to see whether we added the method to the cache. It |
| // might be an erroneous class, which results in it being hidden from us. |
| return resolved_method; |
| } |
| |
| inline ArtField* ClassLinker::GetResolvedField(uint32_t field_idx, mirror::DexCache* dex_cache) { |
| return dex_cache->GetResolvedField(field_idx, image_pointer_size_); |
| } |
| |
| inline ArtField* ClassLinker::GetResolvedField( |
| uint32_t field_idx, mirror::Class* field_declaring_class) { |
| return GetResolvedField(field_idx, field_declaring_class->GetDexCache()); |
| } |
| |
| inline ArtField* ClassLinker::ResolveField(uint32_t field_idx, ArtMethod* referrer, |
| bool is_static) { |
| mirror::Class* declaring_class = referrer->GetDeclaringClass(); |
| ArtField* resolved_field = GetResolvedField(field_idx, declaring_class); |
| if (UNLIKELY(resolved_field == nullptr)) { |
| StackHandleScope<2> hs(Thread::Current()); |
| Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); |
| const DexFile& dex_file = *dex_cache->GetDexFile(); |
| resolved_field = ResolveField(dex_file, field_idx, 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 mirror::Object* ClassLinker::AllocObject(Thread* self) { |
| return GetClassRoot(kJavaLangObject)->Alloc<true, false>( |
| self, |
| Runtime::Current()->GetHeap()->GetCurrentAllocator()); |
| } |
| |
| template <class T> |
| inline mirror::ObjectArray<T>* ClassLinker::AllocObjectArray(Thread* self, size_t length) { |
| return mirror::ObjectArray<T>::Alloc(self, GetClassRoot(kObjectArrayClass), length); |
| } |
| |
| inline mirror::ObjectArray<mirror::Class>* ClassLinker::AllocClassArray(Thread* self, |
| size_t length) { |
| return mirror::ObjectArray<mirror::Class>::Alloc(self, GetClassRoot(kClassArrayClass), length); |
| } |
| |
| inline mirror::ObjectArray<mirror::String>* ClassLinker::AllocStringArray(Thread* self, |
| size_t length) { |
| return mirror::ObjectArray<mirror::String>::Alloc(self, |
| GetClassRoot(kJavaLangStringArrayClass), |
| length); |
| } |
| |
| inline mirror::IfTable* ClassLinker::AllocIfTable(Thread* self, size_t ifcount) { |
| return down_cast<mirror::IfTable*>( |
| mirror::IfTable::Alloc(self, |
| GetClassRoot(kObjectArrayClass), |
| ifcount * mirror::IfTable::kMax)); |
| } |
| |
| inline mirror::Class* ClassLinker::GetClassRoot(ClassRoot class_root) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(!class_roots_.IsNull()); |
| mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); |
| mirror::Class* klass = class_roots->Get(class_root); |
| DCHECK(klass != nullptr); |
| return klass; |
| } |
| |
| template<ReadBarrierOption kReadBarrierOption> |
| ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, ArtMethod* proxy_method) { |
| DCHECK(proxy_class->IsProxyClass()); |
| DCHECK(proxy_method->IsProxyMethod<kReadBarrierOption>()); |
| { |
| Thread* const self = Thread::Current(); |
| ReaderMutexLock mu(self, dex_lock_); |
| // Locate the dex cache of the original interface/Object |
| for (const DexCacheData& data : dex_caches_) { |
| if (!self->IsJWeakCleared(data.weak_root) && |
| proxy_method->HasSameDexCacheResolvedTypes(data.resolved_types, |
| image_pointer_size_)) { |
| mirror::DexCache* dex_cache = down_cast<mirror::DexCache*>( |
| self->DecodeJObject(data.weak_root)); |
| if (dex_cache != nullptr) { |
| ArtMethod* resolved_method = dex_cache->GetResolvedMethod( |
| proxy_method->GetDexMethodIndex(), image_pointer_size_); |
| CHECK(resolved_method != nullptr); |
| return resolved_method; |
| } |
| } |
| } |
| } |
| LOG(FATAL) << "Didn't find dex cache for " << PrettyClass(proxy_class) << " " |
| << PrettyMethod(proxy_method); |
| UNREACHABLE(); |
| } |
| |
| } // namespace art |
| |
| #endif // ART_RUNTIME_CLASS_LINKER_INL_H_ |