mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
118 lines
3.2 KiB
C++
118 lines
3.2 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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/**
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* Optimiser component that turns complex expressions into multiple variable
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* declarations.
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*/
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#include <libyul/optimiser/ExpressionSplitter.h>
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#include <libyul/optimiser/ASTWalker.h>
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#include <libyul/optimiser/OptimiserStep.h>
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#include <libyul/AsmData.h>
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#include <libyul/Dialect.h>
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#include <libdevcore/CommonData.h>
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#include <boost/range/adaptor/reversed.hpp>
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using namespace std;
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using namespace dev;
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using namespace langutil;
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using namespace yul;
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void ExpressionSplitter::run(OptimiserStepContext& _context, Block& _ast)
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{
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ExpressionSplitter{_context.dialect, _context.dispenser}(_ast);
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}
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void ExpressionSplitter::operator()(FunctionalInstruction& _instruction)
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{
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for (auto& arg: _instruction.arguments | boost::adaptors::reversed)
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outlineExpression(arg);
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}
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void ExpressionSplitter::operator()(FunctionCall& _funCall)
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{
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if (BuiltinFunction const* builtin = m_dialect.builtin(_funCall.functionName.name))
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if (builtin->literalArguments)
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// We cannot outline function arguments that have to be literals
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return;
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for (auto& arg: _funCall.arguments | boost::adaptors::reversed)
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outlineExpression(arg);
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}
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void ExpressionSplitter::operator()(If& _if)
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{
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outlineExpression(*_if.condition);
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(*this)(_if.body);
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}
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void ExpressionSplitter::operator()(Switch& _switch)
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{
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outlineExpression(*_switch.expression);
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for (auto& _case: _switch.cases)
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// Do not visit the case expression, nothing to split there.
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(*this)(_case.body);
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}
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void ExpressionSplitter::operator()(ForLoop& _loop)
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{
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(*this)(_loop.pre);
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// Do not visit the condition because we cannot split expressions there.
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(*this)(_loop.post);
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(*this)(_loop.body);
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}
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void ExpressionSplitter::operator()(Block& _block)
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{
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vector<Statement> saved;
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swap(saved, m_statementsToPrefix);
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function<std::optional<vector<Statement>>(Statement&)> f =
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[&](Statement& _statement) -> std::optional<vector<Statement>> {
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m_statementsToPrefix.clear();
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visit(_statement);
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if (m_statementsToPrefix.empty())
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return {};
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m_statementsToPrefix.emplace_back(std::move(_statement));
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return std::move(m_statementsToPrefix);
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};
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iterateReplacing(_block.statements, f);
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swap(saved, m_statementsToPrefix);
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}
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void ExpressionSplitter::outlineExpression(Expression& _expr)
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{
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if (holds_alternative<Identifier>(_expr))
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return;
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visit(_expr);
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SourceLocation location = locationOf(_expr);
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YulString var = m_nameDispenser.newName({});
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m_statementsToPrefix.emplace_back(VariableDeclaration{
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location,
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{{TypedName{location, var, {}}}},
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make_unique<Expression>(std::move(_expr))
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});
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_expr = Identifier{location, var};
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}
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