mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
63 lines
1.7 KiB
C++
63 lines
1.7 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/>.
|
|
*/
|
|
/**
|
|
* Component that collects variables that are never assigned to and their
|
|
* initial values.
|
|
*/
|
|
|
|
#include <libyul/optimiser/SSAValueTracker.h>
|
|
|
|
#include <libyul/AsmData.h>
|
|
|
|
using namespace std;
|
|
using namespace dev;
|
|
using namespace yul;
|
|
|
|
void SSAValueTracker::operator()(Assignment const& _assignment)
|
|
{
|
|
for (auto const& var: _assignment.variableNames)
|
|
m_values.erase(var.name);
|
|
}
|
|
|
|
void SSAValueTracker::operator()(FunctionDefinition const& _funDef)
|
|
{
|
|
for (auto const& var: _funDef.returnVariables)
|
|
setValue(var.name, nullptr);
|
|
ASTWalker::operator()(_funDef);
|
|
}
|
|
|
|
void SSAValueTracker::operator()(VariableDeclaration const& _varDecl)
|
|
{
|
|
if (!_varDecl.value)
|
|
for (auto const& var: _varDecl.variables)
|
|
setValue(var.name, nullptr);
|
|
else if (_varDecl.variables.size() == 1)
|
|
setValue(_varDecl.variables.front().name, _varDecl.value.get());
|
|
}
|
|
|
|
void SSAValueTracker::setValue(YulString _name, Expression const* _value)
|
|
{
|
|
assertThrow(
|
|
m_values.count(_name) == 0,
|
|
OptimizerException,
|
|
"Source needs to be disambiguated."
|
|
);
|
|
if (!_value)
|
|
_value = &m_zero;
|
|
m_values[_name] = _value;
|
|
}
|