solidity/libyul/optimiser/LoadResolver.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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/**
* Optimisation stage that replaces expressions of type ``sload(x)`` by the value
* currently stored in storage, if known.
*/
#pragma once
#include <libyul/optimiser/DataFlowAnalyzer.h>
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#include <libyul/optimiser/OptimiserStep.h>
#include <libevmasm/Instruction.h>
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namespace solidity::yul
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{
struct EVMDialect;
struct BuiltinFunctionForEVM;
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/**
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* Optimisation stage that replaces expressions of type ``sload(x)`` and ``mload(x)`` by the value
* currently stored in storage resp. memory, if known.
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*
* Works best if the code is in SSA form.
*
* Prerequisite: Disambiguator, ForLoopInitRewriter.
*/
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class LoadResolver: public DataFlowAnalyzer
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{
public:
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static constexpr char const* name{"LoadResolver"};
/// Run the load resolver on the given complete AST.
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static void run(OptimiserStepContext&, Block& _ast);
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private:
LoadResolver(
Dialect const& _dialect,
std::map<YulString, SideEffects> _functionSideEffects,
bool _optimizeMLoad
):
DataFlowAnalyzer(_dialect, std::move(_functionSideEffects)),
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m_optimizeMLoad(_optimizeMLoad)
{}
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protected:
using ASTModifier::visit;
void visit(Expression& _e) override;
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void tryResolve(
Expression& _e,
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evmasm::Instruction _instruction,
std::vector<Expression> const& _arguments
);
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bool m_optimizeMLoad = false;
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};
}