solidity/libyul/optimiser/ExpressionSimplifier.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
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/**
* Optimiser component that uses the simplification rules to simplify expressions.
*/
#pragma once
#include <libyul/ASTForward.h>
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#include <libyul/optimiser/DataFlowAnalyzer.h>
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namespace solidity::yul
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{
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struct Dialect;
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struct OptimiserStepContext;
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/**
* Applies simplification rules to all expressions.
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* The component will work best if the code is in SSA form, but
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* this is not required for correctness. Using CommonSubexpressionEliminator
* also helps this component track equivalent sub-expressions.
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*
* It tracks the current values of variables using the DataFlowAnalyzer
* and takes them into account for replacements.
*
* Prerequisite: Disambiguator, ForLoopInitRewriter.
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*/
class ExpressionSimplifier: public DataFlowAnalyzer
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{
public:
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static constexpr char const* name{"ExpressionSimplifier"};
static void run(OptimiserStepContext&, Block& _ast);
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using ASTModifier::operator();
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void visit(Expression& _expression) override;
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private:
explicit ExpressionSimplifier(Dialect const& _dialect): DataFlowAnalyzer(_dialect) {}
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};
}