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