solidity/libyul/optimiser/ExpressionInliner.cpp

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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
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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>
#include <libyul/optimiser/Metrics.h>
#include <libyul/optimiser/NameCollector.h>
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#include <libyul/optimiser/Substitution.h>
#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 solidity;
using namespace solidity::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);
ExpressionInliner inliner{_context.dialect, funFinder.inlinableFunctions()};
inliner(_ast);
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}
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void ExpressionInliner::operator()(FunctionDefinition& _fun)
{
ASTModifier::operator()(_fun);
}
void ExpressionInliner::visit(Expression& _expression)
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{
ASTModifier::visit(_expression);
if (holds_alternative<FunctionCall>(_expression))
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{
FunctionCall& funCall = std::get<FunctionCall>(_expression);
if (!m_inlinableFunctions.count(funCall.functionName.name))
return;
FunctionDefinition const& fun = *m_inlinableFunctions.at(funCall.functionName.name);
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map<YulString, Expression const*> substitutions;
for (size_t i = 0; i < funCall.arguments.size(); i++)
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{
Expression const& arg = funCall.arguments[i];
YulString paraName = fun.parameters[i].name;
if (!SideEffectsCollector(m_dialect, arg).movable())
return;
size_t refs = ReferencesCounter::countReferences(fun.body)[paraName];
size_t cost = CodeCost::codeCost(m_dialect, arg);
if (refs > 1 && cost > 1)
return;
substitutions[paraName] = &arg;
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}
_expression = Substitution(substitutions).translate(*std::get<Assignment>(fun.body.statements.front()).value);
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}
}