/src/solidity/libyul/optimiser/OptimiserStep.h

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/*
  This file is part of solidity.

  solidity is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  solidity is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0

#pragma once

#include <libyul/Exceptions.h>

#include <optional>
#include <string>
#include <set>

namespace solidity::yul
{

struct Dialect;
struct Block;
class YulString;
class NameDispenser;

struct OptimiserStepContext
{
  Dialect const& dialect;
  NameDispenser& dispenser;
  std::set<YulString> const& reservedIdentifiers;
  /// The value nullopt represents creation code
  std::optional<size_t> expectedExecutionsPerDeployment;
};


/**
 * Construction to create dynamically callable objects out of the
 * statically callable optimiser steps.
 */
struct OptimiserStep
{
  explicit OptimiserStep(std::string _name): name(std::move(_name)) {}
  virtual ~OptimiserStep() = default;

  virtual void run(OptimiserStepContext&, Block&) const = 0;
  /// @returns non-nullopt if the step cannot be run, for example because it requires
  /// an SMT solver to be loaded, but none is available. In that case, the string
  /// contains a human-readable reason.
  virtual std::optional<std::string> invalidInCurrentEnvironment() const = 0;
  std::string name;
};

template <class Step>
struct OptimiserStepInstance: public OptimiserStep
{
private:
  template<typename T>
  struct HasInvalidInCurrentEnvironmentMethod
  {
  private:
    template<typename U> static auto test(int) -> decltype(U::invalidInCurrentEnvironment(), std::true_type());
    template<typename> static std::false_type test(...);

  public:
    static constexpr bool value = decltype(test<T>(0))::value;
  };

public:
  OptimiserStepInstance(): OptimiserStep{Step::name} {}
  void run(OptimiserStepContext& _context, Block& _ast) const override
  {
    Step::run(_context, _ast);
  }
  std::optional<std::string> invalidInCurrentEnvironment() const override
  {
    if constexpr (HasInvalidInCurrentEnvironmentMethod<Step>::value)
      return Step::invalidInCurrentEnvironment();
    else
      return std::nullopt;
  }
};


}

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Created: 2022-08-24 06:55