1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef PANDA_RUNTIME_HANDLE_STORAGE_H_ 17 #define PANDA_RUNTIME_HANDLE_STORAGE_H_ 18 19 #include "runtime/include/coretypes/tagged_value.h" 20 #include "runtime/include/mem/allocator.h" 21 #include "runtime/include/mem/panda_containers.h" 22 23 namespace panda { 24 class LocalScope; 25 class EscapeLocalScope; 26 27 template <class T> 28 class HandleScope; 29 30 template <class T> 31 class EscapeHandleScope; 32 33 using InternalAllocatorPtr = mem::AllocatorPtr<mem::AllocatorPurpose::ALLOCATOR_PURPOSE_INTERNAL>; 34 35 // storage is the storage structure of the object pointer 36 template <typename T> 37 class HandleStorage { 38 public: HandleStorage(InternalAllocatorPtr allocator)39 explicit HandleStorage(InternalAllocatorPtr allocator) : allocator_(allocator) 40 { 41 ASSERT(allocator_ != nullptr); 42 }; ~HandleStorage()43 ~HandleStorage() 44 { 45 for (auto n : nodes_) { 46 allocator_->Delete(n); 47 } 48 nodes_.clear(); 49 } 50 51 NO_COPY_SEMANTIC(HandleStorage); 52 NO_MOVE_SEMANTIC(HandleStorage); 53 54 private: 55 static const uint32_t NODE_BLOCK_SIZE_LOG2 = 10; 56 static const uint32_t NODE_BLOCK_SIZE = 1U << NODE_BLOCK_SIZE_LOG2; 57 static const uint32_t NODE_BLOCK_SIZE_MASK = NODE_BLOCK_SIZE - 1; 58 59 void ZapFreedHandles(); 60 61 // TaggedType has been specialized for js, Other types are empty implementation UpdateHeapObject()62 void UpdateHeapObject() {} 63 64 // TaggedType has been specialized for js, Other types are empty implementation VisitGCRoots(const ObjectVisitor & cb)65 void VisitGCRoots([[maybe_unused]] const ObjectVisitor &cb) {} 66 67 uintptr_t NewHandle(T value = 0); 68 69 void FreeHandles(uint32_t beginIndex); 70 71 uintptr_t GetNodeAddress(uint32_t index) const; 72 73 uint32_t lastIndex_ {0}; 74 PandaVector<std::array<T, NODE_BLOCK_SIZE> *> nodes_; 75 InternalAllocatorPtr allocator_ {nullptr}; 76 friend class ManagedThread; 77 friend class HandleScope<T>; 78 friend class LocalScope; 79 friend class EscapeLocalScope; 80 friend class EscapeHandleScope<T>; 81 }; 82 83 } // namespace panda 84 85 #endif // PANDA_RUNTIME_HANDLE_STORAGE_H_ 86