mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
68 lines
1.9 KiB
C++
68 lines
1.9 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
|
|
/**
|
|
* Class that can answer questions about values of variables and their relations.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libyul/ASTForward.h>
|
|
#include <libyul/YulString.h>
|
|
|
|
#include <libsolutil/Common.h>
|
|
#include <libsolutil/Numeric.h>
|
|
|
|
#include <map>
|
|
|
|
namespace solidity::yul
|
|
{
|
|
|
|
struct Dialect;
|
|
struct AssignedValue;
|
|
|
|
/**
|
|
* Class that can answer questions about values of variables and their relations.
|
|
*
|
|
* The reference to the map of values provided at construction is assumed to be updating.
|
|
*/
|
|
class KnowledgeBase
|
|
{
|
|
public:
|
|
KnowledgeBase(Dialect const& _dialect, std::map<YulString, AssignedValue> const& _variableValues):
|
|
m_dialect(_dialect),
|
|
m_variableValues(_variableValues)
|
|
{}
|
|
|
|
bool knownToBeDifferent(YulString _a, YulString _b);
|
|
std::optional<u256> differenceIfKnownConstant(YulString _a, YulString _b);
|
|
bool knownToBeDifferentByAtLeast32(YulString _a, YulString _b);
|
|
bool knownToBeEqual(YulString _a, YulString _b) const { return _a == _b; }
|
|
bool knownToBeZero(YulString _a);
|
|
std::optional<u256> valueIfKnownConstant(YulString _a);
|
|
|
|
private:
|
|
Expression simplify(Expression _expression);
|
|
Expression simplifyRecursively(Expression _expression);
|
|
|
|
Dialect const& m_dialect;
|
|
std::map<YulString, AssignedValue> const& m_variableValues;
|
|
size_t m_counter = 0;
|
|
};
|
|
|
|
}
|