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/*
This file is part of cpp-ethereum.
cpp-ethereum 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.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Solidity data types
*/
#include <libsolidity/Types.h>
#include <libsolidity/AST.h>
namespace dev
{
namespace solidity
{
std::shared_ptr<Type> Type::fromElementaryTypeName(Token::Value _typeToken)
{
if (Token::INT <= _typeToken && _typeToken <= Token::HASH256)
{
int offset = _typeToken - Token::INT;
int bits = offset % 5;
if (bits == 0)
bits = 256;
else
bits = (1 << (bits - 1)) * 32;
int modifier = offset / 5;
return std::make_shared<IntegerType>(bits,
modifier == 0 ? IntegerType::Modifier::SIGNED :
modifier == 1 ? IntegerType::Modifier::UNSIGNED :
IntegerType::Modifier::HASH);
}
else if (_typeToken == Token::ADDRESS)
return std::make_shared<IntegerType>(0, IntegerType::Modifier::ADDRESS);
else if (_typeToken == Token::BOOL)
return std::make_shared<BoolType>();
else
BOOST_ASSERT(false); // @todo add other tyes
}
std::shared_ptr<Type> Type::fromUserDefinedTypeName(UserDefinedTypeName const& _typeName)
{
return std::make_shared<StructType>(*_typeName.getReferencedStruct());
}
std::shared_ptr<Type> Type::fromMapping(Mapping const&)
{
BOOST_ASSERT(false); //@todo not yet implemented
return std::shared_ptr<Type>();
}
std::shared_ptr<Type> Type::forLiteral(Literal const& _literal)
{
switch (_literal.getToken())
{
case Token::TRUE_LITERAL:
case Token::FALSE_LITERAL:
return std::make_shared<BoolType>();
case Token::NUMBER:
return IntegerType::smallestTypeForLiteral(_literal.getValue());
case Token::STRING_LITERAL:
return std::shared_ptr<Type>(); // @todo
default:
return std::shared_ptr<Type>();
}
}
std::shared_ptr<IntegerType> IntegerType::smallestTypeForLiteral(std::string const&)
{
//@todo
return std::make_shared<IntegerType>(256, Modifier::UNSIGNED);
}
IntegerType::IntegerType(int _bits, IntegerType::Modifier _modifier):
m_bits(_bits), m_modifier(_modifier)
{
BOOST_ASSERT(_bits > 0 && _bits <= 256 && _bits % 8 == 0);
if (isAddress())
_bits = 160;
}
bool IntegerType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.getCategory() != Category::INTEGER)
return false;
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (convertTo.m_bits < m_bits)
return false;
if (isAddress())
return convertTo.isAddress();
else if (isHash())
return convertTo.isHash();
else if (isSigned())
return convertTo.isSigned();
else
return !convertTo.isSigned() || convertTo.m_bits > m_bits;
}
bool IntegerType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
return _convertTo.getCategory() == Category::INTEGER;
}
bool IntegerType::acceptsBinaryOperator(Token::Value _operator) const
{
if (isAddress())
return Token::isCompareOp(_operator);
else if (isHash())
return Token::isCompareOp(_operator) || Token::isBitOp(_operator);
else
return true;
}
bool IntegerType::acceptsUnaryOperator(Token::Value _operator) const
{
return _operator == Token::DELETE || (!isAddress() && _operator == Token::BIT_NOT);
}
bool BoolType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
// conversion to integer is fine, but not to address
// this is an example of explicit conversions being not transitive (though implicit should be)
if (_convertTo.getCategory() == Category::INTEGER)
{
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (!convertTo.isAddress())
return true;
}
return isImplicitlyConvertibleTo(_convertTo);
}
bool ContractType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.getCategory() != Category::CONTRACT)
return false;
ContractType const& convertTo = dynamic_cast<ContractType const&>(_convertTo);
return &m_contract == &convertTo.m_contract;
}
bool StructType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.getCategory() != Category::STRUCT)
return false;
StructType const& convertTo = dynamic_cast<StructType const&>(_convertTo);
return &m_struct == &convertTo.m_struct;
}
}
}
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