mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
80 lines
2.4 KiB
C++
80 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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/**
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* Optimiser component that performs function inlining inside expressions.
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*/
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#include <libyul/optimiser/ExpressionInliner.h>
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#include <libyul/optimiser/InlinableExpressionFunctionFinder.h>
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#include <libyul/optimiser/Metrics.h>
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#include <libyul/optimiser/NameCollector.h>
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#include <libyul/optimiser/Substitution.h>
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#include <libyul/optimiser/Semantics.h>
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#include <libyul/optimiser/OptimiserStep.h>
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#include <libyul/AsmData.h>
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using namespace std;
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using namespace dev;
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using namespace yul;
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void ExpressionInliner::run(OptimiserStepContext& _context, Block& _ast)
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{
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InlinableExpressionFunctionFinder funFinder;
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funFinder(_ast);
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ExpressionInliner inliner{_context.dialect, funFinder.inlinableFunctions()};
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inliner(_ast);
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}
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void ExpressionInliner::operator()(FunctionDefinition& _fun)
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{
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ASTModifier::operator()(_fun);
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}
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void ExpressionInliner::visit(Expression& _expression)
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{
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ASTModifier::visit(_expression);
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if (holds_alternative<FunctionCall>(_expression))
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{
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FunctionCall& funCall = std::get<FunctionCall>(_expression);
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if (!m_inlinableFunctions.count(funCall.functionName.name))
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return;
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FunctionDefinition const& fun = *m_inlinableFunctions.at(funCall.functionName.name);
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map<YulString, Expression const*> substitutions;
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for (size_t i = 0; i < funCall.arguments.size(); i++)
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{
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Expression const& arg = funCall.arguments[i];
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YulString paraName = fun.parameters[i].name;
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if (!SideEffectsCollector(m_dialect, arg).movable())
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return;
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size_t refs = ReferencesCounter::countReferences(fun.body)[paraName];
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size_t cost = CodeCost::codeCost(m_dialect, arg);
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if (refs > 1 && cost > 1)
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return;
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substitutions[paraName] = &arg;
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}
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_expression = Substitution(substitutions).translate(*std::get<Assignment>(fun.body.statements.front()).value);
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}
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}
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