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// Copyright 2012-2022 The ANTLR Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted
// provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions
// and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of
// conditions and the following disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to
// endorse or promote products derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
// WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <utility>
#include "atn/PredictionContext.h"
#include "atn/PredictionContextMergeCacheOptions.h"
#include "FlatHashMap.h"
namespace antlr4 {
namespace atn {
class ANTLR4CPP_PUBLIC PredictionContextMergeCache final {
public:
PredictionContextMergeCache()
: PredictionContextMergeCache(PredictionContextMergeCacheOptions()) {}
explicit PredictionContextMergeCache(const PredictionContextMergeCacheOptions &options);
PredictionContextMergeCache(const PredictionContextMergeCache&) = delete;
PredictionContextMergeCache(PredictionContextMergeCache&&) = delete;
PredictionContextMergeCache& operator=(const PredictionContextMergeCache&) = delete;
PredictionContextMergeCache& operator=(PredictionContextMergeCache&&) = delete;
Ref<const PredictionContext> put(const Ref<const PredictionContext> &key1,
const Ref<const PredictionContext> &key2,
Ref<const PredictionContext> value);
Ref<const PredictionContext> get(const Ref<const PredictionContext> &key1,
const Ref<const PredictionContext> &key2) const;
const PredictionContextMergeCacheOptions& getOptions() const { return _options; }
void clear();
private:
using PredictionContextPair = std::pair<const PredictionContext*, const PredictionContext*>;
struct ANTLR4CPP_PUBLIC PredictionContextHasher final {
size_t operator()(const PredictionContextPair &value) const;
};
struct ANTLR4CPP_PUBLIC PredictionContextComparer final {
bool operator()(const PredictionContextPair &lhs, const PredictionContextPair &rhs) const;
};
struct ANTLR4CPP_PUBLIC Entry final {
std::pair<Ref<const PredictionContext>, Ref<const PredictionContext>> key;
Ref<const PredictionContext> value;
Entry *prev = nullptr;
Entry *next = nullptr;
};
void moveToFront(Entry *entry) const;
void pushToFront(Entry *entry);
void remove(Entry *entry);
void compact(const Entry *preserve);
using Container = FlatHashMap<PredictionContextPair, std::unique_ptr<Entry>,
PredictionContextHasher, PredictionContextComparer>;
const PredictionContextMergeCacheOptions _options;
Container _entries;
mutable Entry *_head = nullptr;
mutable Entry *_tail = nullptr;
size_t _size = 0;
};
} // namespace atn
} // namespace antlr4
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