mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
59 lines
1.8 KiB
C++
59 lines
1.8 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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#pragma once
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#include <libyul/optimiser/ASTWalker.h>
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#include <libyul/Dialect.h>
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namespace solidity::yul
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{
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struct OptimiserStepContext;
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/**
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* Rewrites ForLoop by moving iteration condition into the ForLoop body.
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* For example, `for {} lt(a, b) {} { mstore(1, 2) }` will become
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* `for {} 1 {} { if iszero(lt(a, b)) { break } mstore(1, 2) }`
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*
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* By moving the iteration check part into the ForLoop body, we can apply expression splitter
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* to the condition expression.
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*
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* This rewriter will skip loops that already have literal constant as iteration condition.
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*
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* Requirements:
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* - The Disambiguator must be run upfront.
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* - To avoid unnecessary rewrite, it is recommended to run this rewriter after StructuralSimplifier.
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* - Only works for dialects with a builtin boolean negation function.
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*/
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class ForLoopConditionIntoBody: public ASTModifier
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{
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public:
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static constexpr char const* name{"ForLoopConditionIntoBody"};
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static void run(OptimiserStepContext&, Block& _ast);
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using ASTModifier::operator();
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void operator()(ForLoop& _forLoop) override;
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private:
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ForLoopConditionIntoBody(Dialect const& _dialect): m_dialect(_dialect) {}
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Dialect const& m_dialect;
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};
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}
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