mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
75 lines
2.4 KiB
C++
75 lines
2.4 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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#include <libyul/optimiser/ForLoopConditionOutOfBody.h>
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#include <libyul/optimiser/Semantics.h>
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#include <libyul/AsmData.h>
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#include <libyul/Utilities.h>
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#include <libsolutil/CommonData.h>
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using namespace std;
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using namespace solidity;
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using namespace solidity::yul;
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void ForLoopConditionOutOfBody::run(OptimiserStepContext& _context, Block& _ast)
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{
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ForLoopConditionOutOfBody{_context.dialect}(_ast);
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}
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void ForLoopConditionOutOfBody::operator()(ForLoop& _forLoop)
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{
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ASTModifier::operator()(_forLoop);
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if (
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!m_dialect.booleanNegationFunction() ||
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!holds_alternative<Literal>(*_forLoop.condition) ||
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valueOfLiteral(std::get<Literal>(*_forLoop.condition)) == u256(0) ||
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_forLoop.body.statements.empty() ||
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!holds_alternative<If>(_forLoop.body.statements.front())
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)
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return;
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If& firstStatement = std::get<If>(_forLoop.body.statements.front());
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if (
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firstStatement.body.statements.empty() ||
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!holds_alternative<Break>(firstStatement.body.statements.front())
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)
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return;
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if (!SideEffectsCollector(m_dialect, *firstStatement.condition).movable())
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return;
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YulString iszero = m_dialect.booleanNegationFunction()->name;
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langutil::SourceLocation location = locationOf(*firstStatement.condition);
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if (
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holds_alternative<FunctionCall>(*firstStatement.condition) &&
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std::get<FunctionCall>(*firstStatement.condition).functionName.name == iszero
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)
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_forLoop.condition = make_unique<Expression>(std::move(std::get<FunctionCall>(*firstStatement.condition).arguments.front()));
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else
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_forLoop.condition = make_unique<Expression>(FunctionCall{
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location,
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Identifier{location, iszero},
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util::make_vector<Expression>(
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std::move(*firstStatement.condition)
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)
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});
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_forLoop.body.statements.erase(_forLoop.body.statements.begin());
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}
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