mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
52 lines
1.6 KiB
C++
52 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/>.
|
|
*/
|
|
#pragma once
|
|
|
|
#include <libyul/optimiser/ASTWalker.h>
|
|
#include <libyul/optimiser/DataFlowAnalyzer.h>
|
|
|
|
namespace yul
|
|
{
|
|
|
|
/**
|
|
* Structural simplifier. Performs the following simplification steps:
|
|
* - replace if with empty body with pop(condition)
|
|
* - replace if with true condition with its body
|
|
* - remove if with false condition
|
|
* - turn switch with single case into if
|
|
* - replace switch with only default case with pop(expression) and body
|
|
* - remove for with false condition
|
|
*
|
|
* Prerequisites: Disambiguator
|
|
*
|
|
* Important: Can only be used on EVM code.
|
|
*/
|
|
class StructuralSimplifier: public DataFlowAnalyzer
|
|
{
|
|
public:
|
|
explicit StructuralSimplifier(Dialect const& _dialect): DataFlowAnalyzer(_dialect) {}
|
|
|
|
using DataFlowAnalyzer::operator();
|
|
void operator()(Block& _block) override;
|
|
private:
|
|
void simplify(std::vector<Statement>& _statements);
|
|
bool expressionAlwaysTrue(Expression const &_expression);
|
|
bool expressionAlwaysFalse(Expression const &_expression);
|
|
};
|
|
|
|
}
|