mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
130 lines
3.3 KiB
C++
130 lines
3.3 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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* Generator for code that handles LValues.
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*/
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#pragma once
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#include <libsolidity/codegen/YulUtilFunctions.h>
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#include <libdevcore/Common.h>
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#include <string>
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#include <ostream>
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#include <boost/variant.hpp>
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namespace solidity::frontend
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{
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class VariableDeclaration;
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class IRGenerationContext;
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class Type;
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class ArrayType;
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/**
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* Abstract class used to retrieve, delete and store data in LValues.
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*/
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class IRLValue
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{
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protected:
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explicit IRLValue(YulUtilFunctions _utils, Type const* _type = nullptr):
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m_utils(std::move(_utils)),
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m_type(_type)
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{}
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public:
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virtual ~IRLValue() = default;
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/// @returns an expression to retrieve the value of the lvalue.
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virtual std::string retrieveValue() const = 0;
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/// Returns code that stores the value of @a _value (should be an identifier)
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/// of type @a _type in the lvalue. Might perform type conversion.
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virtual std::string storeValue(std::string const& _value, Type const& _type) const = 0;
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/// Returns code that will reset the stored value to zero
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virtual std::string setToZero() const = 0;
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protected:
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YulUtilFunctions mutable m_utils;
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Type const* m_type;
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};
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class IRLocalVariable: public IRLValue
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{
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public:
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IRLocalVariable(
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IRGenerationContext& _context,
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VariableDeclaration const& _varDecl
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);
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std::string retrieveValue() const override { return m_variableName; }
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std::string storeValue(std::string const& _value, Type const& _type) const override;
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std::string setToZero() const override;
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private:
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std::string m_variableName;
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};
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class IRStorageItem: public IRLValue
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{
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public:
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IRStorageItem(
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IRGenerationContext& _context,
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VariableDeclaration const& _varDecl
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);
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IRStorageItem(
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YulUtilFunctions _utils,
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std::string _slot,
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boost::variant<std::string, unsigned> _offset,
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Type const& _type
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);
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std::string retrieveValue() const override;
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std::string storeValue(std::string const& _value, Type const& _type) const override;
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std::string setToZero() const override;
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private:
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IRStorageItem(
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YulUtilFunctions _utils,
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Type const& _type,
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std::pair<u256, unsigned> slot_offset
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);
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std::string const m_slot;
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/// unsigned: Used when the offset is known at compile time, uses optimized
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/// functions
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/// string: Used when the offset is determined at run time
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boost::variant<std::string, unsigned> const m_offset;
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};
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class IRMemoryItem: public IRLValue
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{
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public:
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IRMemoryItem(
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YulUtilFunctions _utils,
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std::string _address,
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bool _byteArrayElement,
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Type const& _type
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);
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std::string retrieveValue() const override;
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std::string storeValue(std::string const& _value, Type const& _type) const override;
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std::string setToZero() const override;
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private:
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std::string const m_address;
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bool m_byteArrayElement;
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};
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}
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