solidity/libyul/optimiser/CircularReferencesPruner.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/>.
*/
/**
* Optimization stage that removes functions that call each other but are
* otherwise unreferenced.
*
* Prerequisites: Disambiguator, FunctionHoister.
*/
#pragma once
#include <libyul/optimiser/ASTWalker.h>
#include <libyul/optimiser/CallGraphGenerator.h>
#include <libyul/optimiser/OptimiserStep.h>
namespace solidity::yul
{
/**
* Optimization stage that removes functions that call each other but are
* neither externally referenced nor referenced from the outermost context.
*/
class CircularReferencesPruner: public ASTModifier
{
public:
static constexpr char const* name{"CircularReferencesPruner"};
static void run(OptimiserStepContext& _context, Block& _ast);
using ASTModifier::operator();
void operator()(Block& _block) override;
private:
CircularReferencesPruner(std::set<YulString> const& _reservedIdentifiers):
m_reservedIdentifiers(_reservedIdentifiers)
{}
/// Run a breadth-first search starting from the outermost context and
/// externally referenced functions to find all the functions that are
/// called from there either directly or indirectly.
std::set<YulString> functionsCalledFromOutermostContext(CallGraph const& _callGraph);
std::set<YulString> const& m_reservedIdentifiers;
};
}