mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
127 lines
3.6 KiB
C++
127 lines
3.6 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/>.
|
|
*/
|
|
/**
|
|
* Scopes for identifiers.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libsolidity/interface/Exceptions.h>
|
|
|
|
#include <boost/variant.hpp>
|
|
#include <boost/optional.hpp>
|
|
|
|
#include <functional>
|
|
#include <memory>
|
|
|
|
namespace dev
|
|
{
|
|
namespace solidity
|
|
{
|
|
namespace assembly
|
|
{
|
|
|
|
template <class...>
|
|
struct GenericVisitor{};
|
|
|
|
template <class Visitable, class... Others>
|
|
struct GenericVisitor<Visitable, Others...>: public GenericVisitor<Others...>
|
|
{
|
|
using GenericVisitor<Others...>::operator ();
|
|
explicit GenericVisitor(
|
|
std::function<void(Visitable&)> _visitor,
|
|
std::function<void(Others&)>... _otherVisitors
|
|
):
|
|
GenericVisitor<Others...>(_otherVisitors...),
|
|
m_visitor(_visitor)
|
|
{}
|
|
|
|
void operator()(Visitable& _v) const { m_visitor(_v); }
|
|
|
|
std::function<void(Visitable&)> m_visitor;
|
|
};
|
|
template <>
|
|
struct GenericVisitor<>: public boost::static_visitor<> {
|
|
void operator()() const {}
|
|
};
|
|
|
|
|
|
struct Scope
|
|
{
|
|
using JuliaType = std::string;
|
|
using LabelID = size_t;
|
|
|
|
struct Variable { JuliaType type; };
|
|
struct Label { };
|
|
struct Function
|
|
{
|
|
std::vector<JuliaType> arguments;
|
|
std::vector<JuliaType> returns;
|
|
};
|
|
|
|
using Identifier = boost::variant<Variable, Label, Function>;
|
|
using Visitor = GenericVisitor<Variable const, Label const, Function const>;
|
|
using NonconstVisitor = GenericVisitor<Variable, Label, Function>;
|
|
|
|
bool registerVariable(std::string const& _name, JuliaType const& _type);
|
|
bool registerLabel(std::string const& _name);
|
|
bool registerFunction(
|
|
std::string const& _name,
|
|
std::vector<JuliaType> const& _arguments,
|
|
std::vector<JuliaType> const& _returns
|
|
);
|
|
|
|
/// Looks up the identifier in this or super scopes and returns a valid pointer if found
|
|
/// or a nullptr if not found. Variable lookups up across function boundaries will fail, as
|
|
/// will any lookups across assembly boundaries.
|
|
/// The pointer will be invalidated if the scope is modified.
|
|
/// @param _crossedFunction if true, we already crossed a function boundary during recursive lookup
|
|
Identifier* lookup(std::string const& _name);
|
|
/// Looks up the identifier in this and super scopes (will not find variables across function
|
|
/// boundaries and generally stops at assembly boundaries) and calls the visitor, returns
|
|
/// false if not found.
|
|
template <class V>
|
|
bool lookup(std::string const& _name, V const& _visitor)
|
|
{
|
|
if (Identifier* id = lookup(_name))
|
|
{
|
|
boost::apply_visitor(_visitor, *id);
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
/// @returns true if the name exists in this scope or in super scopes (also searches
|
|
/// across function and assembly boundaries).
|
|
bool exists(std::string const& _name);
|
|
|
|
/// @returns the number of variables directly registered inside the scope.
|
|
size_t numberOfVariables() const;
|
|
/// @returns true if this scope is inside a function.
|
|
bool insideFunction() const;
|
|
|
|
Scope* superScope = nullptr;
|
|
/// If true, variables from the super scope are not visible here (other identifiers are),
|
|
/// but they are still taken into account to prevent shadowing.
|
|
bool functionScope = false;
|
|
std::map<std::string, Identifier> identifiers;
|
|
};
|
|
|
|
}
|
|
}
|
|
}
|