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Types.cpp
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Types.cpp
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/*
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/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Solidity data types
*/
#include <libsolidity/ast/Types.h>
#include <libsolidity/ast/AST.h>
#include <libdevcore/CommonIO.h>
#include <libdevcore/CommonData.h>
#include <libdevcore/Keccak256.h>
#include <libdevcore/UTF8.h>
#include <libdevcore/Algorithms.h>
#include <boost/algorithm/string/join.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include <boost/range/algorithm/copy.hpp>
#include <boost/range/adaptor/sliced.hpp>
#include <boost/range/adaptor/transformed.hpp>
#include <boost/algorithm/string.hpp>
#include <limits>
using namespace std;
using namespace dev;
using namespace dev::solidity;
namespace
{
unsigned int mostSignificantBit(bigint const& _number)
{
#if BOOST_VERSION < 105500
solAssert(_number > 0, "");
bigint number = _number;
unsigned int result = 0;
while (number != 0)
{
number >>= 1;
++result;
}
return --result;
#else
return boost::multiprecision::msb(_number);
#endif
}
/// Check whether (_base ** _exp) fits into 4096 bits.
bool fitsPrecisionExp(bigint const& _base, bigint const& _exp)
{
if (_base == 0)
return true;
solAssert(_base > 0, "");
size_t const bitsMax = 4096;
unsigned mostSignificantBaseBit = mostSignificantBit(_base);
if (mostSignificantBaseBit == 0) // _base == 1
return true;
if (mostSignificantBaseBit > bitsMax) // _base >= 2 ^ 4096
return false;
bigint bitsNeeded = _exp * (mostSignificantBaseBit + 1);
return bitsNeeded <= bitsMax;
}
/// Checks whether _mantissa * (X ** _exp) fits into 4096 bits,
/// where X is given indirectly via _log2OfBase = log2(X).
bool fitsPrecisionBaseX(
bigint const& _mantissa,
double _log2OfBase,
uint32_t _exp
)
{
if (_mantissa == 0)
return true;
solAssert(_mantissa > 0, "");
size_t const bitsMax = 4096;
unsigned mostSignificantMantissaBit = mostSignificantBit(_mantissa);
if (mostSignificantMantissaBit > bitsMax) // _mantissa >= 2 ^ 4096
return false;
bigint bitsNeeded = mostSignificantMantissaBit + bigint(floor(double(_exp) * _log2OfBase)) + 1;
return bitsNeeded <= bitsMax;
}
/// Checks whether _mantissa * (10 ** _expBase10) fits into 4096 bits.
bool fitsPrecisionBase10(bigint const& _mantissa, uint32_t _expBase10)
{
double const log2Of10AwayFromZero = 3.3219280948873624;
return fitsPrecisionBaseX(_mantissa, log2Of10AwayFromZero, _expBase10);
}
/// Checks whether _mantissa * (2 ** _expBase10) fits into 4096 bits.
bool fitsPrecisionBase2(bigint const& _mantissa, uint32_t _expBase2)
{
return fitsPrecisionBaseX(_mantissa, 1.0, _expBase2);
}
}
void StorageOffsets::computeOffsets(TypePointers const& _types)
{
bigint slotOffset = 0;
unsigned byteOffset = 0;
map<size_t, pair<u256, unsigned>> offsets;
for (size_t i = 0; i < _types.size(); ++i)
{
TypePointer const& type = _types[i];
if (!type->canBeStored())
continue;
if (byteOffset + type->storageBytes() > 32)
{
// would overflow, go to next slot
++slotOffset;
byteOffset = 0;
}
if (slotOffset >= bigint(1) << 256)
BOOST_THROW_EXCEPTION(Error(Error::Type::TypeError) << errinfo_comment("Object too large for storage."));
offsets[i] = make_pair(u256(slotOffset), byteOffset);
solAssert(type->storageSize() >= 1, "Invalid storage size.");
if (type->storageSize() == 1 && byteOffset + type->storageBytes() <= 32)
byteOffset += type->storageBytes();
else
{
slotOffset += type->storageSize();
byteOffset = 0;
}
}
if (byteOffset > 0)
++slotOffset;
if (slotOffset >= bigint(1) << 256)
BOOST_THROW_EXCEPTION(Error(Error::Type::TypeError) << errinfo_comment("Object too large for storage."));
m_storageSize = u256(slotOffset);
swap(m_offsets, offsets);
}
pair<u256, unsigned> const* StorageOffsets::offset(size_t _index) const
{
if (m_offsets.count(_index))
return &m_offsets.at(_index);
else
return nullptr;
}
void MemberList::combine(MemberList const & _other)
{
m_memberTypes += _other.m_memberTypes;
}
pair<u256, unsigned> const* MemberList::memberStorageOffset(string const& _name) const
{
if (!m_storageOffsets)
{
TypePointers memberTypes;
memberTypes.reserve(m_memberTypes.size());
for (auto const& member: m_memberTypes)
memberTypes.push_back(member.type);
m_storageOffsets.reset(new StorageOffsets());
m_storageOffsets->computeOffsets(memberTypes);
}
for (size_t index = 0; index < m_memberTypes.size(); ++index)
if (m_memberTypes[index].name == _name)
return m_storageOffsets->offset(index);
return nullptr;
}
u256 const& MemberList::storageSize() const
{
// trigger lazy computation
memberStorageOffset("");
return m_storageOffsets->storageSize();
}
/// Helper functions for type identifier
namespace
{
string parenthesizeIdentifier(string const& _internal)
{
return "(" + _internal + ")";
}
template <class Range>
string identifierList(Range const&& _list)
{
return parenthesizeIdentifier(boost::algorithm::join(_list, ","));
}
string richIdentifier(TypePointer const& _type)
{
return _type ? _type->richIdentifier() : "";
}
string identifierList(vector<TypePointer> const& _list)
{
return identifierList(_list | boost::adaptors::transformed(richIdentifier));
}
string identifierList(TypePointer const& _type)
{
return parenthesizeIdentifier(richIdentifier(_type));
}
string identifierList(TypePointer const& _type1, TypePointer const& _type2)
{
TypePointers list;
list.push_back(_type1);
list.push_back(_type2);
return identifierList(list);
}
string parenthesizeUserIdentifier(string const& _internal)
{
return parenthesizeIdentifier(_internal);
}
}
string Type::escapeIdentifier(string const& _identifier)
{
string ret = _identifier;
// FIXME: should be _$$$_
boost::algorithm::replace_all(ret, "$", "$$$");
boost::algorithm::replace_all(ret, ",", "_$_");
boost::algorithm::replace_all(ret, "(", "$_");
boost::algorithm::replace_all(ret, ")", "_$");
return ret;
}
string Type::identifier() const
{
string ret = escapeIdentifier(richIdentifier());
solAssert(ret.find_first_of("0123456789") != 0, "Identifier cannot start with a number.");
solAssert(
ret.find_first_not_of("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ_$") == string::npos,
"Identifier contains invalid characters."
);
return ret;
}
TypePointer Type::fromElementaryTypeName(ElementaryTypeNameToken const& _type)
{
solAssert(TokenTraits::isElementaryTypeName(_type.token()),
"Expected an elementary type name but got " + _type.toString()
);
Token token = _type.token();
unsigned m = _type.firstNumber();
unsigned n = _type.secondNumber();
switch (token)
{
case Token::IntM:
return make_shared<IntegerType>(m, IntegerType::Modifier::Signed);
case Token::UIntM:
return make_shared<IntegerType>(m, IntegerType::Modifier::Unsigned);
case Token::BytesM:
return make_shared<FixedBytesType>(m);
case Token::FixedMxN:
return make_shared<FixedPointType>(m, n, FixedPointType::Modifier::Signed);
case Token::UFixedMxN:
return make_shared<FixedPointType>(m, n, FixedPointType::Modifier::Unsigned);
case Token::Int:
return make_shared<IntegerType>(256, IntegerType::Modifier::Signed);
case Token::UInt:
return make_shared<IntegerType>(256, IntegerType::Modifier::Unsigned);
case Token::Fixed:
return make_shared<FixedPointType>(128, 18, FixedPointType::Modifier::Signed);
case Token::UFixed:
return make_shared<FixedPointType>(128, 18, FixedPointType::Modifier::Unsigned);
case Token::Byte:
return make_shared<FixedBytesType>(1);
case Token::Address:
return make_shared<AddressType>(StateMutability::NonPayable);
case Token::Bool:
return make_shared<BoolType>();
case Token::Bytes:
return make_shared<ArrayType>(DataLocation::Storage);
case Token::String:
return make_shared<ArrayType>(DataLocation::Storage, true);
//no types found
default:
solAssert(
false,
"Unable to convert elementary typename " + _type.toString() + " to type."
);
}
}
TypePointer Type::fromElementaryTypeName(string const& _name)
{
vector<string> nameParts;
boost::split(nameParts, _name, boost::is_any_of(" "));
solAssert(nameParts.size() == 1 || nameParts.size() == 2, "Cannot parse elementary type: " + _name);
Token token;
unsigned short firstNum, secondNum;
tie(token, firstNum, secondNum) = TokenTraits::fromIdentifierOrKeyword(nameParts[0]);
auto t = fromElementaryTypeName(ElementaryTypeNameToken(token, firstNum, secondNum));
if (auto* ref = dynamic_cast<ReferenceType const*>(t.get()))
{
DataLocation location = DataLocation::Storage;
if (nameParts.size() == 2)
{
if (nameParts[1] == "storage")
location = DataLocation::Storage;
else if (nameParts[1] == "calldata")
location = DataLocation::CallData;
else if (nameParts[1] == "memory")
location = DataLocation::Memory;
else
solAssert(false, "Unknown data location: " + nameParts[1]);
}
return ref->copyForLocation(location, true);
}
else if (t->category() == Type::Category::Address)
{
if (nameParts.size() == 2)
{
if (nameParts[1] == "payable")
return make_shared<AddressType>(StateMutability::Payable);
else
solAssert(false, "Invalid state mutability for address type: " + nameParts[1]);
}
return make_shared<AddressType>(StateMutability::NonPayable);
}
else
{
solAssert(nameParts.size() == 1, "Storage location suffix only allowed for reference types");
return t;
}
}
TypePointer Type::forLiteral(Literal const& _literal)
{
switch (_literal.token())
{
case Token::TrueLiteral:
case Token::FalseLiteral:
return make_shared<BoolType>();
case Token::Number:
return RationalNumberType::forLiteral(_literal);
case Token::StringLiteral:
return make_shared<StringLiteralType>(_literal);
default:
return TypePointer();
}
}
TypePointer Type::commonType(TypePointer const& _a, TypePointer const& _b)
{
if (!_a || !_b)
return TypePointer();
else if (_a->mobileType() && _b->isImplicitlyConvertibleTo(*_a->mobileType()))
return _a->mobileType();
else if (_b->mobileType() && _a->isImplicitlyConvertibleTo(*_b->mobileType()))
return _b->mobileType();
else
return TypePointer();
}
MemberList const& Type::members(ContractDefinition const* _currentScope) const
{
if (!m_members[_currentScope])
{
MemberList::MemberMap members = nativeMembers(_currentScope);
if (_currentScope)
members += boundFunctions(*this, *_currentScope);
m_members[_currentScope] = unique_ptr<MemberList>(new MemberList(move(members)));
}
return *m_members[_currentScope];
}
TypePointer Type::fullEncodingType(bool _inLibraryCall, bool _encoderV2, bool _packed) const
{
TypePointer encodingType = mobileType();
if (encodingType)
encodingType = encodingType->interfaceType(_inLibraryCall);
if (encodingType)
encodingType = encodingType->encodingType();
// Structs are fine in the following circumstances:
// - ABIv2 without packed encoding or,
// - storage struct for a library
if (_inLibraryCall && encodingType->dataStoredIn(DataLocation::Storage))
return encodingType;
TypePointer baseType = encodingType;
while (auto const* arrayType = dynamic_cast<ArrayType const*>(baseType.get()))
baseType = arrayType->baseType();
if (dynamic_cast<StructType const*>(baseType.get()))
if (!_encoderV2 || _packed)
return TypePointer();
return encodingType;
}
MemberList::MemberMap Type::boundFunctions(Type const& _type, ContractDefinition const& _scope)
{
// Normalise data location of type.
TypePointer type = ReferenceType::copyForLocationIfReference(DataLocation::Storage, _type.shared_from_this());
set<Declaration const*> seenFunctions;
MemberList::MemberMap members;
for (ContractDefinition const* contract: _scope.annotation().linearizedBaseContracts)
for (UsingForDirective const* ufd: contract->usingForDirectives())
{
if (ufd->typeName() && *type != *ReferenceType::copyForLocationIfReference(
DataLocation::Storage,
ufd->typeName()->annotation().type
))
continue;
auto const& library = dynamic_cast<ContractDefinition const&>(
*ufd->libraryName().annotation().referencedDeclaration
);
for (FunctionDefinition const* function: library.definedFunctions())
{
if (!function->isVisibleAsLibraryMember() || seenFunctions.count(function))
continue;
seenFunctions.insert(function);
FunctionType funType(*function, false);
if (auto fun = funType.asMemberFunction(true, true))
if (_type.isImplicitlyConvertibleTo(*fun->selfType()))
members.push_back(MemberList::Member(function->name(), fun, function));
}
}
return members;
}
AddressType::AddressType(StateMutability _stateMutability):
m_stateMutability(_stateMutability)
{
solAssert(m_stateMutability == StateMutability::Payable || m_stateMutability == StateMutability::NonPayable, "");
}
string AddressType::richIdentifier() const
{
if (m_stateMutability == StateMutability::Payable)
return "t_address_payable";
else
return "t_address";
}
bool AddressType::isImplicitlyConvertibleTo(Type const& _other) const
{
if (_other.category() != category())
return false;
AddressType const& other = dynamic_cast<AddressType const&>(_other);
return other.m_stateMutability <= m_stateMutability;
}
bool AddressType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
if (auto const* contractType = dynamic_cast<ContractType const*>(&_convertTo))
return (m_stateMutability >= StateMutability::Payable) || !contractType->isPayable();
return isImplicitlyConvertibleTo(_convertTo) ||
_convertTo.category() == Category::Integer ||
(_convertTo.category() == Category::FixedBytes && 160 == dynamic_cast<FixedBytesType const&>(_convertTo).numBytes() * 8);
}
string AddressType::toString(bool) const
{
if (m_stateMutability == StateMutability::Payable)
return "address payable";
else
return "address";
}
string AddressType::canonicalName() const
{
return "address";
}
u256 AddressType::literalValue(Literal const* _literal) const
{
solAssert(_literal, "");
solAssert(_literal->value().substr(0, 2) == "0x", "");
return u256(_literal->valueWithoutUnderscores());
}
TypePointer AddressType::unaryOperatorResult(Token _operator) const
{
return _operator == Token::Delete ? make_shared<TupleType>() : TypePointer();
}
TypePointer AddressType::binaryOperatorResult(Token _operator, TypePointer const& _other) const
{
// Addresses can only be compared.
if (!TokenTraits::isCompareOp(_operator))
return TypePointer();
return Type::commonType(shared_from_this(), _other);
}
bool AddressType::operator==(Type const& _other) const
{
if (_other.category() != category())
return false;
AddressType const& other = dynamic_cast<AddressType const&>(_other);
return other.m_stateMutability == m_stateMutability;
}
MemberList::MemberMap AddressType::nativeMembers(ContractDefinition const*) const
{
MemberList::MemberMap members = {
{"balance", make_shared<IntegerType>(256)},
{"call", make_shared<FunctionType>(strings{"bytes memory"}, strings{"bool", "bytes memory"}, FunctionType::Kind::BareCall, false, StateMutability::Payable)},
{"callcode", make_shared<FunctionType>(strings{"bytes memory"}, strings{"bool", "bytes memory"}, FunctionType::Kind::BareCallCode, false, StateMutability::Payable)},
{"delegatecall", make_shared<FunctionType>(strings{"bytes memory"}, strings{"bool", "bytes memory"}, FunctionType::Kind::BareDelegateCall, false)},
{"staticcall", make_shared<FunctionType>(strings{"bytes memory"}, strings{"bool", "bytes memory"}, FunctionType::Kind::BareStaticCall, false, StateMutability::View)}
};
if (m_stateMutability == StateMutability::Payable)
{
members.emplace_back(MemberList::Member{"send", make_shared<FunctionType>(strings{"uint"}, strings{"bool"}, FunctionType::Kind::Send)});
members.emplace_back(MemberList::Member{"transfer", make_shared<FunctionType>(strings{"uint"}, strings(), FunctionType::Kind::Transfer)});
}
return members;
}
namespace
{
bool isValidShiftAndAmountType(Token _operator, Type const& _shiftAmountType)
{
// Disable >>> here.
if (_operator == Token::SHR)
return false;
else if (IntegerType const* otherInt = dynamic_cast<decltype(otherInt)>(&_shiftAmountType))
return true;
else if (RationalNumberType const* otherRat = dynamic_cast<decltype(otherRat)>(&_shiftAmountType))
return !otherRat->isFractional() && otherRat->integerType() && !otherRat->integerType()->isSigned();
else
return false;
}
}
IntegerType::IntegerType(unsigned _bits, IntegerType::Modifier _modifier):
m_bits(_bits), m_modifier(_modifier)
{
solAssert(
m_bits > 0 && m_bits <= 256 && m_bits % 8 == 0,
"Invalid bit number for integer type: " + dev::toString(m_bits)
);
}
string IntegerType::richIdentifier() const
{
return "t_" + string(isSigned() ? "" : "u") + "int" + to_string(numBits());
}
bool IntegerType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.category() == category())
{
IntegerType const& convertTo = dynamic_cast<IntegerType const&>(_convertTo);
if (convertTo.m_bits < m_bits)
return false;
else if (isSigned())
return convertTo.isSigned();
else
return !convertTo.isSigned() || convertTo.m_bits > m_bits;
}
else if (_convertTo.category() == Category::FixedPoint)
{
FixedPointType const& convertTo = dynamic_cast<FixedPointType const&>(_convertTo);
return maxValue() <= convertTo.maxIntegerValue() && minValue() >= convertTo.minIntegerValue();
}
else
return false;
}
bool IntegerType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
return _convertTo.category() == category() ||
_convertTo.category() == Category::Address ||
_convertTo.category() == Category::Contract ||
_convertTo.category() == Category::Enum ||
(_convertTo.category() == Category::FixedBytes && numBits() == dynamic_cast<FixedBytesType const&>(_convertTo).numBytes() * 8) ||
_convertTo.category() == Category::FixedPoint;
}
TypePointer IntegerType::unaryOperatorResult(Token _operator) const
{
// "delete" is ok for all integer types
if (_operator == Token::Delete)
return make_shared<TupleType>();
// we allow +, -, ++ and --
else if (_operator == Token::Add || _operator == Token::Sub ||
_operator == Token::Inc || _operator == Token::Dec ||
_operator == Token::BitNot)
return shared_from_this();
else
return TypePointer();
}
bool IntegerType::operator==(Type const& _other) const
{
if (_other.category() != category())
return false;
IntegerType const& other = dynamic_cast<IntegerType const&>(_other);
return other.m_bits == m_bits && other.m_modifier == m_modifier;
}
string IntegerType::toString(bool) const
{
string prefix = isSigned() ? "int" : "uint";
return prefix + dev::toString(m_bits);
}
bigint IntegerType::minValue() const
{
if (isSigned())
return -(bigint(1) << (m_bits - 1));
else
return bigint(0);
}
bigint IntegerType::maxValue() const
{
if (isSigned())
return (bigint(1) << (m_bits - 1)) - 1;
else
return (bigint(1) << m_bits) - 1;
}
TypePointer IntegerType::binaryOperatorResult(Token _operator, TypePointer const& _other) const
{
if (
_other->category() != Category::RationalNumber &&
_other->category() != Category::FixedPoint &&
_other->category() != category()
)
return TypePointer();
if (TokenTraits::isShiftOp(_operator))
{
// Shifts are not symmetric with respect to the type
if (isValidShiftAndAmountType(_operator, *_other))
return shared_from_this();
else
return TypePointer();
}
auto commonType = Type::commonType(shared_from_this(), _other); //might be an integer or fixed point
if (!commonType)
return TypePointer();
// All integer types can be compared
if (TokenTraits::isCompareOp(_operator))
return commonType;
if (TokenTraits::isBooleanOp(_operator))
return TypePointer();
if (auto intType = dynamic_pointer_cast<IntegerType const>(commonType))
{
// Signed EXP is not allowed
if (Token::Exp == _operator && intType->isSigned())
return TypePointer();
}
else if (auto fixType = dynamic_pointer_cast<FixedPointType const>(commonType))
if (Token::Exp == _operator)
return TypePointer();
return commonType;
}
FixedPointType::FixedPointType(unsigned _totalBits, unsigned _fractionalDigits, FixedPointType::Modifier _modifier):
m_totalBits(_totalBits), m_fractionalDigits(_fractionalDigits), m_modifier(_modifier)
{
solAssert(
8 <= m_totalBits && m_totalBits <= 256 && m_totalBits % 8 == 0 && m_fractionalDigits <= 80,
"Invalid bit number(s) for fixed type: " +
dev::toString(_totalBits) + "x" + dev::toString(_fractionalDigits)
);
}
string FixedPointType::richIdentifier() const
{
return "t_" + string(isSigned() ? "" : "u") + "fixed" + to_string(m_totalBits) + "x" + to_string(m_fractionalDigits);
}
bool FixedPointType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
if (_convertTo.category() == category())
{
FixedPointType const& convertTo = dynamic_cast<FixedPointType const&>(_convertTo);
if (convertTo.numBits() < m_totalBits || convertTo.fractionalDigits() < m_fractionalDigits)
return false;
else
return convertTo.maxIntegerValue() >= maxIntegerValue() && convertTo.minIntegerValue() <= minIntegerValue();
}
return false;
}
bool FixedPointType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
return _convertTo.category() == category() || _convertTo.category() == Category::Integer;
}
TypePointer FixedPointType::unaryOperatorResult(Token _operator) const
{
switch(_operator)
{
case Token::Delete:
// "delete" is ok for all fixed types
return make_shared<TupleType>();
case Token::Add:
case Token::Sub:
case Token::Inc:
case Token::Dec:
// for fixed, we allow +, -, ++ and --
return shared_from_this();
default:
return TypePointer();
}
}
bool FixedPointType::operator==(Type const& _other) const
{
if (_other.category() != category())
return false;
FixedPointType const& other = dynamic_cast<FixedPointType const&>(_other);
return other.m_totalBits == m_totalBits && other.m_fractionalDigits == m_fractionalDigits && other.m_modifier == m_modifier;
}
string FixedPointType::toString(bool) const
{
string prefix = isSigned() ? "fixed" : "ufixed";
return prefix + dev::toString(m_totalBits) + "x" + dev::toString(m_fractionalDigits);
}
bigint FixedPointType::maxIntegerValue() const
{
bigint maxValue = (bigint(1) << (m_totalBits - (isSigned() ? 1 : 0))) - 1;
return maxValue / boost::multiprecision::pow(bigint(10), m_fractionalDigits);
}
bigint FixedPointType::minIntegerValue() const
{
if (isSigned())
{
bigint minValue = -(bigint(1) << (m_totalBits - (isSigned() ? 1 : 0)));
return minValue / boost::multiprecision::pow(bigint(10), m_fractionalDigits);
}
else
return bigint(0);
}
TypePointer FixedPointType::binaryOperatorResult(Token _operator, TypePointer const& _other) const
{
auto commonType = Type::commonType(shared_from_this(), _other);
if (!commonType)
return TypePointer();
// All fixed types can be compared
if (TokenTraits::isCompareOp(_operator))
return commonType;
if (TokenTraits::isBitOp(_operator) || TokenTraits::isBooleanOp(_operator) || _operator == Token::Exp)
return TypePointer();
return commonType;
}
std::shared_ptr<IntegerType> FixedPointType::asIntegerType() const
{
return make_shared<IntegerType>(numBits(), isSigned() ? IntegerType::Modifier::Signed : IntegerType::Modifier::Unsigned);
}
tuple<bool, rational> RationalNumberType::parseRational(string const& _value)
{
rational value;
try
{
auto radixPoint = find(_value.begin(), _value.end(), '.');
if (radixPoint != _value.end())
{
if (
!all_of(radixPoint + 1, _value.end(), ::isdigit) ||
!all_of(_value.begin(), radixPoint, ::isdigit)
)
return make_tuple(false, rational(0));
// Only decimal notation allowed here, leading zeros would switch to octal.
auto fractionalBegin = find_if_not(
radixPoint + 1,
_value.end(),
[](char const& a) { return a == '0'; }
);
rational numerator;
rational denominator(1);
denominator = bigint(string(fractionalBegin, _value.end()));
denominator /= boost::multiprecision::pow(
bigint(10),
distance(radixPoint + 1, _value.end())
);
numerator = bigint(string(_value.begin(), radixPoint));
value = numerator + denominator;
}
else
value = bigint(_value);
return make_tuple(true, value);
}
catch (...)
{
return make_tuple(false, rational(0));
}
}
TypePointer RationalNumberType::forLiteral(Literal const& _literal)
{
solAssert(_literal.token() == Token::Number, "");
tuple<bool, rational> validLiteral = isValidLiteral(_literal);
if (get<0>(validLiteral))
{
TypePointer compatibleBytesType;
if (_literal.isHexNumber())
{
size_t const digitCount = _literal.valueWithoutUnderscores().length() - 2;
if (digitCount % 2 == 0 && (digitCount / 2) <= 32)
compatibleBytesType = make_shared<FixedBytesType>(digitCount / 2);
}
return make_shared<RationalNumberType>(get<1>(validLiteral), compatibleBytesType);
}
return TypePointer();
}
tuple<bool, rational> RationalNumberType::isValidLiteral(Literal const& _literal)
{
rational value;
try
{
ASTString valueString = _literal.valueWithoutUnderscores();
auto expPoint = find(valueString.begin(), valueString.end(), 'e');
if (expPoint == valueString.end())
expPoint = find(valueString.begin(), valueString.end(), 'E');
if (boost::starts_with(valueString, "0x"))
{
// process as hex
value = bigint(valueString);
}
else if (expPoint != valueString.end())
{
// Parse mantissa and exponent. Checks numeric limit.
tuple<bool, rational> mantissa = parseRational(string(valueString.begin(), expPoint));
if (!get<0>(mantissa))
return make_tuple(false, rational(0));
value = get<1>(mantissa);
// 0E... is always zero.
if (value == 0)
return make_tuple(true, rational(0));
bigint exp = bigint(string(expPoint + 1, valueString.end()));
if (exp > numeric_limits<int32_t>::max() || exp < numeric_limits<int32_t>::min())
return make_tuple(false, rational(0));
uint32_t expAbs = bigint(abs(exp)).convert_to<uint32_t>();
if (exp < 0)
{
if (!fitsPrecisionBase10(abs(value.denominator()), expAbs))
return make_tuple(false, rational(0));
value /= boost::multiprecision::pow(
bigint(10),
expAbs
);
}
else if (exp > 0)
{
if (!fitsPrecisionBase10(abs(value.numerator()), expAbs))
return make_tuple(false, rational(0));
value *= boost::multiprecision::pow(
bigint(10),
expAbs
);
}
}
else
{
// parse as rational number
tuple<bool, rational> tmp = parseRational(valueString);
if (!get<0>(tmp))
return tmp;
value = get<1>(tmp);
}
}
catch (...)
{
return make_tuple(false, rational(0));
}
switch (_literal.subDenomination())
{
case Literal::SubDenomination::None:
case Literal::SubDenomination::Wei:
case Literal::SubDenomination::Second:
break;
case Literal::SubDenomination::Szabo:
value *= bigint("1000000000000");
break;
case Literal::SubDenomination::Finney:
value *= bigint("1000000000000000");
break;
case Literal::SubDenomination::Ether:
value *= bigint("1000000000000000000");
break;
case Literal::SubDenomination::Minute:
value *= bigint("60");
break;
case Literal::SubDenomination::Hour:
value *= bigint("3600");
break;
case Literal::SubDenomination::Day:
value *= bigint("86400");
break;
case Literal::SubDenomination::Week:
value *= bigint("604800");
break;
case Literal::SubDenomination::Year:
value *= bigint("31536000");
break;
}
return make_tuple(true, value);
}
bool RationalNumberType::isImplicitlyConvertibleTo(Type const& _convertTo) const
{
switch (_convertTo.category())
{
case Category::Integer:
{
if (isFractional())
return false;
IntegerType const& targetType = dynamic_cast<IntegerType const&>(_convertTo);
if (m_value == rational(0))
return true;
unsigned forSignBit = (targetType.isSigned() ? 1 : 0);
if (m_value > rational(0))
{
if (m_value.numerator() <= (u256(-1) >> (256 - targetType.numBits() + forSignBit)))
return true;
return false;
}
if (targetType.isSigned())
{
if (-m_value.numerator() <= (u256(1) << (targetType.numBits() - forSignBit)))
return true;
}
return false;
}
case Category::FixedPoint:
{
if (auto fixed = fixedPointType())
return fixed->isImplicitlyConvertibleTo(_convertTo);
return false;
}
case Category::FixedBytes:
return (m_value == rational(0)) || (m_compatibleBytesType && *m_compatibleBytesType == _convertTo);
default:
return false;
}
}
bool RationalNumberType::isExplicitlyConvertibleTo(Type const& _convertTo) const
{
if (isImplicitlyConvertibleTo(_convertTo))
return true;
else if (_convertTo.category() != Category::FixedBytes)