1 /** 2 * Copyright (c) 2021-2025 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 RECURSIVE_GUARD_H 17 #define RECURSIVE_GUARD_H 18 19 namespace ark::es2panda::parser { 20 21 constexpr unsigned int MAX_RECURSION_DEPTH = 1024; 22 23 struct RecursiveContext { 24 unsigned depth = 0; 25 }; 26 27 class TrackRecursive { 28 public: TrackRecursive(RecursiveContext & recursivecontext)29 explicit TrackRecursive(RecursiveContext &recursivecontext) : recursivecontext_(recursivecontext) 30 { 31 ++recursivecontext_.depth; 32 valid_ = recursivecontext_.depth <= MAX_RECURSION_DEPTH; 33 }; 34 ~TrackRecursive()35 ~TrackRecursive() 36 { 37 --recursivecontext_.depth; 38 } 39 40 TrackRecursive(const TrackRecursive &) = delete; 41 TrackRecursive(TrackRecursive &&) = delete; 42 TrackRecursive &operator=(const TrackRecursive &) = delete; 43 TrackRecursive &operator=(TrackRecursive &&) = delete; 44 45 explicit operator bool() const 46 { 47 return valid_; 48 } 49 50 private: 51 RecursiveContext &recursivecontext_; 52 bool valid_ = true; 53 }; 54 55 } // namespace ark::es2panda::parser 56 57 #endif // UTIL_GUARD_H 58