mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
134 lines
3.8 KiB
C++
134 lines
3.8 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
|
|
/**
|
|
* Specific AST walkers that collect facts about identifiers and definitions.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libyul/optimiser/ASTWalker.h>
|
|
|
|
#include <map>
|
|
#include <set>
|
|
|
|
namespace solidity::yul
|
|
{
|
|
|
|
/**
|
|
* Specific AST walker that collects all defined names.
|
|
*/
|
|
class NameCollector: public ASTWalker
|
|
{
|
|
public:
|
|
enum CollectWhat { VariablesAndFunctions, OnlyVariables };
|
|
|
|
explicit NameCollector(
|
|
Block const& _block,
|
|
CollectWhat _collectWhat = VariablesAndFunctions
|
|
):
|
|
m_collectWhat(_collectWhat)
|
|
{
|
|
(*this)(_block);
|
|
}
|
|
|
|
explicit NameCollector(
|
|
FunctionDefinition const& _functionDefinition,
|
|
CollectWhat _collectWhat = VariablesAndFunctions
|
|
):
|
|
m_collectWhat(_collectWhat)
|
|
{
|
|
(*this)(_functionDefinition);
|
|
}
|
|
|
|
using ASTWalker::operator ();
|
|
void operator()(VariableDeclaration const& _varDecl) override;
|
|
void operator()(FunctionDefinition const& _funDef) override;
|
|
|
|
std::set<YulString> names() const { return m_names; }
|
|
private:
|
|
std::set<YulString> m_names;
|
|
CollectWhat m_collectWhat = VariablesAndFunctions;
|
|
};
|
|
|
|
/**
|
|
* Specific AST walker that counts all references to all declarations.
|
|
*/
|
|
class ReferencesCounter: public ASTWalker
|
|
{
|
|
public:
|
|
enum CountWhat { VariablesAndFunctions, OnlyVariables };
|
|
|
|
explicit ReferencesCounter(CountWhat _countWhat = VariablesAndFunctions):
|
|
m_countWhat(_countWhat)
|
|
{}
|
|
|
|
using ASTWalker::operator ();
|
|
void operator()(Identifier const& _identifier) override;
|
|
void operator()(FunctionCall const& _funCall) override;
|
|
|
|
static std::map<YulString, size_t> countReferences(Block const& _block, CountWhat _countWhat = VariablesAndFunctions);
|
|
static std::map<YulString, size_t> countReferences(FunctionDefinition const& _function, CountWhat _countWhat = VariablesAndFunctions);
|
|
static std::map<YulString, size_t> countReferences(Expression const& _expression, CountWhat _countWhat = VariablesAndFunctions);
|
|
|
|
std::map<YulString, size_t> const& references() const { return m_references; }
|
|
private:
|
|
CountWhat m_countWhat = CountWhat::VariablesAndFunctions;
|
|
std::map<YulString, size_t> m_references;
|
|
};
|
|
|
|
/**
|
|
* Specific AST walker that finds all variables that are assigned to.
|
|
*/
|
|
class Assignments: public ASTWalker
|
|
{
|
|
public:
|
|
using ASTWalker::operator ();
|
|
void operator()(Assignment const& _assignment) override;
|
|
|
|
std::set<YulString> const& names() const { return m_names; }
|
|
private:
|
|
std::set<YulString> m_names;
|
|
};
|
|
|
|
/**
|
|
* Collects all names from a given continue statement on onwards.
|
|
*
|
|
* It makes only sense to be invoked from within a body of an outer for loop, that is,
|
|
* it will only collect all names from the beginning of the first continue statement
|
|
* of the outer-most ForLoop.
|
|
*/
|
|
class AssignmentsSinceContinue: public ASTWalker
|
|
{
|
|
public:
|
|
using ASTWalker::operator();
|
|
void operator()(ForLoop const& _forLoop) override;
|
|
void operator()(Continue const&) override;
|
|
void operator()(Assignment const& _assignment) override;
|
|
void operator()(FunctionDefinition const& _funDef) override;
|
|
|
|
std::set<YulString> const& names() const { return m_names; }
|
|
bool empty() const noexcept { return m_names.empty(); }
|
|
|
|
private:
|
|
size_t m_forLoopDepth = 0;
|
|
bool m_continueFound = false;
|
|
std::set<YulString> m_names;
|
|
};
|
|
|
|
}
|