solidity/libyul/backends/evm/EVMDialect.h
2019-06-17 18:42:47 +02:00

90 lines
2.8 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/>.
*/
/**
* Yul dialects for EVM.
*/
#pragma once
#include <libyul/Dialect.h>
#include <libyul/backends/evm/AbstractAssembly.h>
#include <liblangutil/EVMVersion.h>
#include <map>
namespace yul
{
class YulString;
using Type = YulString;
struct FunctionCall;
struct Object;
/**
* Context used during code generation.
*/
struct BuiltinContext
{
Object const* currentObject = nullptr;
/// Mapping from named objects to abstract assembly sub IDs.
std::map<YulString, AbstractAssembly::SubID> subIDs;
};
struct BuiltinFunctionForEVM: BuiltinFunction
{
boost::optional<dev::eth::Instruction> instruction;
/// Function to generate code for the given function call and append it to the abstract
/// assembly. The fourth parameter is called to visit (and generate code for) the arguments
/// from right to left.
std::function<void(FunctionCall const&, AbstractAssembly&, BuiltinContext&, std::function<void()>)> generateCode;
};
/**
* Yul dialect for EVM as a backend.
* The main difference is that the builtin functions take an AbstractAssembly for the
* code generation.
*/
struct EVMDialect: public Dialect
{
/// Constructor, should only be used internally. Use the factory functions below.
EVMDialect(AsmFlavour _flavour, bool _objectAccess, langutil::EVMVersion _evmVersion);
/// @returns the builtin function of the given name or a nullptr if it is not a builtin function.
BuiltinFunctionForEVM const* builtin(YulString _name) const override;
BuiltinFunctionForEVM const* discardFunction() const override { return builtin("pop"_yulstring); }
BuiltinFunctionForEVM const* equalityFunction() const override { return builtin("eq"_yulstring); }
static EVMDialect const& looseAssemblyForEVM(langutil::EVMVersion _version);
static EVMDialect const& strictAssemblyForEVM(langutil::EVMVersion _version);
static EVMDialect const& strictAssemblyForEVMObjects(langutil::EVMVersion _version);
static EVMDialect const& yulForEVM(langutil::EVMVersion _version);
langutil::EVMVersion evmVersion() const { return m_evmVersion; }
bool providesObjectAccess() const { return m_objectAccess; }
protected:
bool const m_objectAccess;
langutil::EVMVersion const m_evmVersion;
std::map<YulString, BuiltinFunctionForEVM> m_functions;
};
}