solidity/Types.cpp
2014-11-26 15:35:25 +01:00

437 lines
13 KiB
C++

/*
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 <libdevcore/CommonIO.h>
#include <libdevcore/CommonData.h>
#include <libsolidity/Types.h>
#include <libsolidity/AST.h>
using namespace std;
namespace dev
{
namespace solidity
{
shared_ptr<Type> Type::fromElementaryTypeName(Token::Value _typeToken)
{
if (asserts(Token::isElementaryTypeName(_typeToken)))
BOOST_THROW_EXCEPTION(InternalCompilerError());
if (Token::INT <= _typeToken && _typeToken <= Token::HASH256)
{
int offset = _typeToken - Token::INT;
int bytes = offset % 33;
if (bytes == 0)
bytes = 32;
int modifier = offset / 33;
return make_shared<IntegerType>(bytes * 8,
modifier == 0 ? IntegerType::Modifier::SIGNED :
modifier == 1 ? IntegerType::Modifier::UNSIGNED :
IntegerType::Modifier::HASH);
}
else if (_typeToken == Token::ADDRESS)
return make_shared<IntegerType>(0, IntegerType::Modifier::ADDRESS);
else if (_typeToken == Token::BOOL)
return make_shared<BoolType>();
else
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unable to convert elementary typename " +
std::string(Token::toString(_typeToken)) + " to type."));
}
shared_ptr<Type> Type::fromUserDefinedTypeName(UserDefinedTypeName const& _typeName)
{
Declaration const* declaration = _typeName.getReferencedDeclaration();
if (StructDefinition const* structDef = dynamic_cast<StructDefinition const*>(declaration))
return make_shared<StructType>(*structDef);
else if (FunctionDefinition const* function = dynamic_cast<FunctionDefinition const*>(declaration))
return make_shared<FunctionType>(*function);
else if (ContractDefinition const* contract = dynamic_cast<ContractDefinition const*>(declaration))
return make_shared<ContractType>(*contract);
return shared_ptr<Type>();
}
shared_ptr<Type> Type::fromMapping(Mapping const& _typeName)
{
shared_ptr<Type const> keyType = _typeName.getKeyType().toType();
if (!keyType)
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Error resolving type name."));
shared_ptr<Type const> valueType = _typeName.getValueType().toType();
if (!valueType)
BOOST_THROW_EXCEPTION(_typeName.getValueType().createTypeError("Invalid type name"));
return make_shared<MappingType>(keyType, valueType);
}
shared_ptr<Type> Type::forLiteral(Literal const& _literal)
{
switch (_literal.getToken())
{
case Token::TRUE_LITERAL:
case Token::FALSE_LITERAL:
return make_shared<BoolType>();
case Token::NUMBER:
return IntegerType::smallestTypeForLiteral(_literal.getValue());
case Token::STRING_LITERAL:
return shared_ptr<Type>(); // @todo add string literals
default:
return shared_ptr<Type>();
}
}
const MemberList Type::EmptyMemberList = MemberList();
shared_ptr<IntegerType> IntegerType::smallestTypeForLiteral(string const& _literal)
{
bigint value(_literal);
bool isSigned = value < 0 || (!_literal.empty() && _literal.front() == '-');
if (isSigned)
// convert to positive number of same bit requirements
value = ((-value) - 1) << 1;
unsigned bytes = max(bytesRequired(value), 1u);
if (bytes > 32)
return shared_ptr<IntegerType>();
return make_shared<IntegerType>(bytes * 8, isSigned ? Modifier::SIGNED : Modifier::UNSIGNED);
}
IntegerType::IntegerType(int _bits, IntegerType::Modifier _modifier):
m_bits(_bits), m_modifier(_modifier)
{
if (isAddress())
m_bits = 160;
if (asserts(m_bits > 0 && m_bits <= 256 && m_bits % 8 == 0))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid bit number for integer type: " + dev::toString(_bits)));
}
bool IntegerType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.getCategory() != getCategory())
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() == getCategory();
}
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
{
if (_operator == Token::DELETE)
return true;
if (isAddress())
return false;
if (_operator == Token::BIT_NOT)
return true;
if (isHash())
return false;
return _operator == Token::ADD || _operator == Token::SUB ||
_operator == Token::INC || _operator == Token::DEC;
}
bool IntegerType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
IntegerType const& other = dynamic_cast<IntegerType const&>(_other);
return other.m_bits == m_bits && other.m_modifier == m_modifier;
}
string IntegerType::toString() const
{
if (isAddress())
return "address";
string prefix = isHash() ? "hash" : (isSigned() ? "int" : "uint");
return prefix + dev::toString(m_bits);
}
u256 IntegerType::literalValue(Literal const& _literal) const
{
bigint value(_literal.getValue());
return u256(value);
}
const MemberList IntegerType::AddressMemberList =
MemberList({{"balance", make_shared<IntegerType const>(256)},
{"send", make_shared<FunctionType const>(TypePointers({make_shared<IntegerType const>(256)}),
TypePointers(), FunctionType::Location::SEND)}});
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() == getCategory())
{
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (!convertTo.isAddress())
return true;
}
return isImplicitlyConvertibleTo(_convertTo);
}
u256 BoolType::literalValue(Literal const& _literal) const
{
if (_literal.getToken() == Token::TRUE_LITERAL)
return u256(1);
else if (_literal.getToken() == Token::FALSE_LITERAL)
return u256(0);
else
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Bool type constructed from non-boolean literal."));
}
bool ContractType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
if (isImplicitlyConvertibleTo(_convertTo))
return true;
if (_convertTo.getCategory() == Category::INTEGER)
return dynamic_cast<IntegerType const&>(_convertTo).isAddress();
return false;
}
bool ContractType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
ContractType const& other = dynamic_cast<ContractType const&>(_other);
return other.m_contract == m_contract;
}
u256 ContractType::getStorageSize() const
{
u256 size = 0;
for (ASTPointer<VariableDeclaration> const& variable: m_contract.getStateVariables())
size += variable->getType()->getStorageSize();
return max<u256>(1, size);
}
string ContractType::toString() const
{
return "contract " + m_contract.getName();
}
bool StructType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
StructType const& other = dynamic_cast<StructType const&>(_other);
return other.m_struct == m_struct;
}
u256 StructType::getStorageSize() const
{
u256 size = 0;
for (pair<string, shared_ptr<Type const>> const& member: getMembers())
size += member.second->getStorageSize();
return max<u256>(1, size);
}
bool StructType::canLiveOutsideStorage() const
{
for (pair<string, shared_ptr<Type const>> const& member: getMembers())
if (!member.second->canLiveOutsideStorage())
return false;
return true;
}
string StructType::toString() const
{
return string("struct ") + m_struct.getName();
}
MemberList const& StructType::getMembers() const
{
// We need to lazy-initialize it because of recursive references.
if (!m_members)
{
map<string, shared_ptr<Type const>> members;
for (ASTPointer<VariableDeclaration> const& variable: m_struct.getMembers())
members[variable->getName()] = variable->getType();
m_members.reset(new MemberList(members));
}
return *m_members;
}
u256 StructType::getStorageOffsetOfMember(string const& _name) const
{
//@todo cache member offset?
u256 offset;
for (ASTPointer<VariableDeclaration> variable: m_struct.getMembers())
{
offset += variable->getType()->getStorageSize();
if (variable->getName() == _name)
return offset;
}
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Storage offset of non-existing member requested."));
}
FunctionType::FunctionType(FunctionDefinition const& _function)
{
TypePointers params;
TypePointers retParams;
params.reserve(_function.getParameters().size());
for (ASTPointer<VariableDeclaration> const& var: _function.getParameters())
params.push_back(var->getType());
retParams.reserve(_function.getReturnParameters().size());
for (ASTPointer<VariableDeclaration> const& var: _function.getReturnParameters())
retParams.push_back(var->getType());
swap(params, m_parameterTypes);
swap(retParams, m_returnParameterTypes);
m_location = Location::INTERNAL;
}
bool FunctionType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
FunctionType const& other = dynamic_cast<FunctionType const&>(_other);
if (m_parameterTypes.size() != other.m_parameterTypes.size() ||
m_returnParameterTypes.size() != other.m_returnParameterTypes.size())
return false;
auto typeCompare = [](TypePointer const& _a, TypePointer const& _b) -> bool { return *_a == *_b; };
if (!equal(m_parameterTypes.cbegin(), m_parameterTypes.cend(),
other.m_parameterTypes.cbegin(), typeCompare))
return false;
if (!equal(m_returnParameterTypes.cbegin(), m_returnParameterTypes.cend(),
other.m_returnParameterTypes.cbegin(), typeCompare))
return false;
return true;
}
string FunctionType::toString() const
{
string name = "function (";
for (auto it = m_parameterTypes.begin(); it != m_parameterTypes.end(); ++it)
name += (*it)->toString() + (it + 1 == m_parameterTypes.end() ? "" : ",");
name += ") returns (";
for (auto it = m_returnParameterTypes.begin(); it != m_returnParameterTypes.end(); ++it)
name += (*it)->toString() + (it + 1 == m_returnParameterTypes.end() ? "" : ",");
return name + ")";
}
unsigned FunctionType::getSizeOnStack() const
{
switch (m_location)
{
case Location::INTERNAL:
return 1;
case Location::EXTERNAL:
return 2;
default:
return 0;
}
}
bool MappingType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
MappingType const& other = dynamic_cast<MappingType const&>(_other);
return *other.m_keyType == *m_keyType && *other.m_valueType == *m_valueType;
}
string MappingType::toString() const
{
return "mapping(" + getKeyType()->toString() + " => " + getValueType()->toString() + ")";
}
bool TypeType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
TypeType const& other = dynamic_cast<TypeType const&>(_other);
return *getActualType() == *other.getActualType();
}
MagicType::MagicType(MagicType::Kind _kind):
m_kind(_kind)
{
switch (m_kind)
{
case Kind::BLOCK:
m_members = MemberList({{"coinbase", make_shared<IntegerType const>(0, IntegerType::Modifier::ADDRESS)},
{"timestamp", make_shared<IntegerType const>(256)},
{"prevhash", make_shared<IntegerType const>(256, IntegerType::Modifier::HASH)},
{"difficulty", make_shared<IntegerType const>(256)},
{"number", make_shared<IntegerType const>(256)},
{"gaslimit", make_shared<IntegerType const>(256)}});
break;
case Kind::MSG:
m_members = MemberList({{"sender", make_shared<IntegerType const>(0, IntegerType::Modifier::ADDRESS)},
{"value", make_shared<IntegerType const>(256)}});
break;
case Kind::TX:
m_members = MemberList({{"origin", make_shared<IntegerType const>(0, IntegerType::Modifier::ADDRESS)},
{"gas", make_shared<IntegerType const>(256)},
{"gasprice", make_shared<IntegerType const>(256)}});
break;
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown kind of magic."));
}
}
bool MagicType::operator==(Type const& _other) const
{
if (_other.getCategory() != getCategory())
return false;
MagicType const& other = dynamic_cast<MagicType const&>(_other);
return other.m_kind == m_kind;
}
string MagicType::toString() const
{
switch (m_kind)
{
case Kind::BLOCK:
return "block";
case Kind::MSG:
return "msg";
case Kind::TX:
return "tx";
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown kind of magic."));
}
}
}
}