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/*
* Copyright 2016 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
*
*
* 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 WABT_BINDING_HASH_H_
#define WABT_BINDING_HASH_H_
#include <functional>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
#include "wabt/common.h"
namespace wabt {
struct Var;
struct Binding {
explicit Binding(Index index) : index(index) {}
Binding(const Location& loc, Index index) : loc(loc), index(index) {}
Location loc;
Index index;
};
// This class derives from a C++ container, which is usually not advisable
// because they don't have virtual destructors. So don't delete a BindingHash
// object through a pointer to std::unordered_multimap.
class BindingHash : public std::unordered_multimap<std::string, Binding> {
public:
using DuplicateCallback =
std::function<void(const value_type&, const value_type&)>;
void FindDuplicates(DuplicateCallback callback) const;
Index FindIndex(const Var&) const;
Index FindIndex(const std::string& name) const {
auto iter = find(name);
return iter != end() ? iter->second.index : kInvalidIndex;
}
Index FindIndex(std::string_view name) const {
return FindIndex(std::string(name));
}
private:
using ValueTypeVector = std::vector<const value_type*>;
void CreateDuplicatesVector(ValueTypeVector* out_duplicates) const;
void SortDuplicatesVectorByLocation(ValueTypeVector* duplicates) const;
void CallCallbacks(const ValueTypeVector& duplicates,
DuplicateCallback callback) const;
};
} // namespace wabt
#endif /* WABT_BINDING_HASH_H_ */