mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
100 lines
3.0 KiB
C++
100 lines
3.0 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 <liblangutil/Exceptions.h>
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#include <libyul/YulString.h>
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#include <libdevcore/Visitor.h>
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#include <boost/variant.hpp>
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#include <boost/optional.hpp>
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#include <functional>
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#include <memory>
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namespace yul
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{
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struct Scope
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{
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using YulType = YulString;
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using LabelID = size_t;
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struct Variable { YulType type; };
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struct Label { };
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struct Function
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{
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std::vector<YulType> arguments;
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std::vector<YulType> returns;
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};
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using Identifier = boost::variant<Variable, Label, Function>;
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using Visitor = dev::GenericVisitor<Variable const, Label const, Function const>;
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using NonconstVisitor = dev::GenericVisitor<Variable, Label, Function>;
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bool registerVariable(YulString _name, YulType const& _type);
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bool registerLabel(YulString _name);
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bool registerFunction(
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YulString _name,
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std::vector<YulType> _arguments,
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std::vector<YulType> _returns
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);
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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(YulString _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(YulString _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(YulString _name) const;
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/// @returns the number of variables directly registered inside the scope.
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size_t numberOfVariables() const;
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/// @returns true if this scope is inside a function.
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bool insideFunction() const;
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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<YulString, Identifier> identifiers;
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};
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}
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