solidity/libyul/optimiser/Scoper.h
2021-01-27 19:42:08 +01:00

59 lines
1.5 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/>.
*/
// SPDX-License-Identifier: GPL-3.0
#pragma once
/**
* Base class that assigns scope to Yul AST
*/
#include <libyul/optimiser/ASTWalker.h>
#include <libyul/AST.h>
namespace solidity::yul
{
class Scoper: public ASTModifier
{
public:
using ASTModifier::operator();
void operator()(VariableDeclaration& _varDecl) override;
void operator()(FunctionDefinition& _fun) override;
void operator()(Block& _block) override;
protected:
/// Returns true iff the variable is in scope.
bool inScope(YulString _variableName) const;
/// Creates a new inner scope.
virtual void pushScope(bool _functionScope);
/// Removes the innermost scope and clears all variables in it.
virtual void popScope();
struct Scope
{
explicit Scope(bool _isFunction): isFunction(_isFunction) {}
std::set<YulString> variables;
bool isFunction;
};
std::vector<Scope> m_variableScopes;
};
}