mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Scopes for identifiers.
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*/
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#pragma once
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#include <libsolidity/interface/Exceptions.h>
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#include <boost/variant.hpp>
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#include <functional>
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#include <memory>
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namespace dev
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{
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namespace solidity
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{
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namespace assembly
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{
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template <class...>
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struct GenericVisitor{};
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template <class Visitable, class... Others>
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struct GenericVisitor<Visitable, Others...>: public GenericVisitor<Others...>
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{
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using GenericVisitor<Others...>::operator ();
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explicit GenericVisitor(
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std::function<void(Visitable&)> _visitor,
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std::function<void(Others&)>... _otherVisitors
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):
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GenericVisitor<Others...>(_otherVisitors...),
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m_visitor(_visitor)
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{}
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void operator()(Visitable& _v) const { m_visitor(_v); }
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std::function<void(Visitable&)> m_visitor;
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};
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template <>
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struct GenericVisitor<>: public boost::static_visitor<> {
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void operator()() const {}
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};
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struct Scope
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{
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struct Variable
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{
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/// Used during code generation to store the stack height. @todo move there.
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int stackHeight = 0;
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/// Used during analysis to check whether we already passed the declaration inside the block.
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/// @todo move there.
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bool active = false;
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};
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struct Label
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{
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size_t id = unassignedLabelId;
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static const size_t unassignedLabelId = 0;
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};
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struct Function
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{
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Function(size_t _arguments, size_t _returns): arguments(_arguments), returns(_returns) {}
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size_t arguments = 0;
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size_t returns = 0;
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};
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using Identifier = boost::variant<Variable, Label, Function>;
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using Visitor = GenericVisitor<Variable const, Label const, Function const>;
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using NonconstVisitor = GenericVisitor<Variable, Label, Function>;
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bool registerVariable(std::string const& _name);
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bool registerLabel(std::string const& _name);
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bool registerFunction(std::string const& _name, size_t _arguments, size_t _returns);
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/// Looks up the identifier in this or super scopes and returns a valid pointer if found
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/// or a nullptr if not found. Variable lookups up across function boundaries will fail, as
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/// will any lookups across assembly boundaries.
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/// The pointer will be invalidated if the scope is modified.
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/// @param _crossedFunction if true, we already crossed a function boundary during recursive lookup
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Identifier* lookup(std::string const& _name);
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/// Looks up the identifier in this and super scopes (will not find variables across function
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/// boundaries and generally stops at assembly boundaries) and calls the visitor, returns
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/// false if not found.
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template <class V>
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bool lookup(std::string const& _name, V const& _visitor)
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{
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if (Identifier* id = lookup(_name))
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{
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boost::apply_visitor(_visitor, *id);
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return true;
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}
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else
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return false;
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}
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/// @returns true if the name exists in this scope or in super scopes (also searches
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/// across function and assembly boundaries).
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bool exists(std::string const& _name);
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Scope* superScope = nullptr;
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/// If true, variables from the super scope are not visible here (other identifiers are),
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/// but they are still taken into account to prevent shadowing.
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bool functionScope = false;
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std::map<std::string, Identifier> identifiers;
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};
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}
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}
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}
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