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