/* * Copyright 2017 WebAssembly Community Group participants * * 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 wasm_ir_label_h #define wasm_ir_label_h #include "wasm-traversal.h" #include "wasm.h" namespace wasm { namespace LabelUtils { // Handles branch/loop labels in a function; makes it easy to add new // ones without duplicates class LabelManager : public PostWalker { public: LabelManager(Function* func) { walkFunction(func); } Name getUnique(std::string prefix) { while (1) { auto curr = Name(prefix + std::to_string(counter++)); if (labels.find(curr) == labels.end()) { labels.insert(curr); return curr; } } } void visitBlock(Block* curr) { labels.insert(curr->name); } void visitLoop(Loop* curr) { labels.insert(curr->name); } private: std::set labels; size_t counter = 0; }; } // namespace LabelUtils } // namespace wasm #endif // wasm_ir_label_h