solidity/libyul/optimiser/OptimizerUtilities.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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/**
* Small useful snippets for the optimiser.
*/
#pragma once
#include <libsolutil/Common.h>
#include <libyul/ASTForward.h>
#include <libyul/Dialect.h>
#include <libyul/YulString.h>
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#include <libyul/optimiser/ASTWalker.h>
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#include <optional>
namespace solidity::evmasm
{
enum class Instruction: uint8_t;
}
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namespace solidity::yul
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{
/// Removes statements that are just empty blocks (non-recursive).
/// If this is run on the outermost block, the FunctionGrouper should be run afterwards to keep
/// the canonical form.
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void removeEmptyBlocks(Block& _block);
/// Returns true if a given literal can not be used as an identifier.
/// This includes Yul keywords and builtins of the given dialect.
bool isRestrictedIdentifier(Dialect const& _dialect, YulString const& _identifier);
/// Helper function that returns the instruction, if the `_name` is a BuiltinFunction
std::optional<evmasm::Instruction> toEVMInstruction(Dialect const& _dialect, YulString const& _name);
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class StatementRemover: public ASTModifier
{
public:
explicit StatementRemover(std::set<Statement const*> const& _toRemove): m_toRemove(_toRemove) {}
void operator()(Block& _block) override;
private:
std::set<Statement const*> const& m_toRemove;
};
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}