mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
58 lines
1.6 KiB
C++
58 lines
1.6 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libyul/optimiser/ASTWalker.h>
|
|
|
|
#include <map>
|
|
#include <set>
|
|
|
|
namespace yul
|
|
{
|
|
|
|
/**
|
|
* Class that walks the AST and stores the initial value of each variable
|
|
* that is never assigned to.
|
|
*
|
|
* A special zero constant expression is used for the default value of variables.
|
|
*
|
|
* Prerequisite: Disambiguator
|
|
*/
|
|
class SSAValueTracker: public ASTWalker
|
|
{
|
|
public:
|
|
using ASTWalker::operator();
|
|
void operator()(FunctionDefinition const& _funDef) override;
|
|
void operator()(VariableDeclaration const& _varDecl) override;
|
|
void operator()(Assignment const& _assignment) override;
|
|
|
|
std::map<YulString, Expression const*> const& values() const { return m_values; }
|
|
Expression const* value(YulString _name) const { return m_values.at(_name); }
|
|
|
|
private:
|
|
void setValue(YulString _name, Expression const* _value);
|
|
|
|
std::map<YulString, Expression const*> m_values;
|
|
};
|
|
|
|
}
|