mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* Optimiser component that performs function inlining.
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*/
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#pragma once
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#include <libyul/optimiser/ASTWalker.h>
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#include <libyul/ASTForward.h>
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#include <optional>
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#include <set>
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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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/**
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* Optimiser component that modifies an AST in place, inlining functions that can be
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* inlined inside functional expressions, i.e. functions that
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* - return a single value
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* - have a body like r := <functional expression>
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* - neither reference themselves nor r in the right hand side
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*
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* Furthermore, for all parameters, all of the following need to be true
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* - the argument is movable
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* - the parameter is either referenced less than twice in the function body, or the argument is rather cheap
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* ("cost" of at most 1 like a constant up to 0xff)
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*
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* This component can only be used on sources with unique names.
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*/
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class ExpressionInliner: public ASTModifier
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{
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public:
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static constexpr char const* name{"ExpressionInliner"};
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static void run(OptimiserStepContext&, Block& _ast);
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using ASTModifier::operator();
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void operator()(FunctionDefinition& _fun) override;
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void visit(Expression& _expression) override;
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private:
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ExpressionInliner(
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Dialect const& _dialect,
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std::map<YulString, FunctionDefinition const*> const& _inlinableFunctions
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): m_dialect(_dialect), m_inlinableFunctions(_inlinableFunctions)
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{}
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Dialect const& m_dialect;
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std::map<YulString, FunctionDefinition const*> const& m_inlinableFunctions;
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std::map<YulString, YulString> m_varReplacements;
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/// Set of functions we are currently visiting inside.
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std::set<YulString> m_currentFunctions;
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};
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}
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