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_INTERPRETER_CACHE_H_ 17 #define PANDA_RUNTIME_INTERPRETER_CACHE_H_ 18 19 #include <array> 20 #include "libpandabase/utils/math_helpers.h" 21 #include "runtime/include/method.h" 22 23 namespace panda { 24 25 class InterpreterCache { 26 public: Has(const void * pc,Method * caller)27 bool Has(const void *pc, Method *caller) const 28 { 29 const auto &entry = data_[GetIndex(pc)]; 30 return entry.pc == pc && entry.caller == caller; 31 } 32 33 template <class T> Get(const void * pc,Method * caller)34 T *Get(const void *pc, Method *caller) const 35 { 36 if (UNLIKELY(!Has(pc, caller))) { 37 return nullptr; 38 } 39 return static_cast<T *>(data_[GetIndex(pc)].item); 40 } 41 42 template <class T> Set(const void * pc,T * item,Method * caller)43 void Set(const void *pc, T *item, Method *caller) 44 { 45 data_[GetIndex(pc)] = {pc, item, caller}; 46 } 47 Clear()48 void Clear() 49 { 50 data_.fill({}); 51 } 52 53 private: GetIndex(const void * pc)54 static size_t GetIndex(const void *pc) 55 { 56 return panda::helpers::math::PowerOfTwoTableSlot(reinterpret_cast<size_t>(pc), N, 2U); 57 } 58 59 struct Entry { 60 const void *pc {nullptr}; 61 void *item {nullptr}; 62 Method *caller {nullptr}; 63 }; 64 65 static constexpr size_t N = 256; 66 static_assert(panda::helpers::math::IsPowerOfTwo(N)); 67 std::array<Entry, N> data_ {}; 68 }; 69 70 } // namespace panda 71 72 #endif // PANDA_RUNTIME_INTERPRETER_CACHE_H_ 73