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Add tests for implcit conversions from literals to fixed-point numbers.

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This commit is contained in:
Yi Huang
2018-12-10 17:31:20 +01:00
committed by chriseth
parent 687382ae09
commit 81f703427e
5 changed files with 86 additions and 55 deletions
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libsolidity/ast/Types.cpp
+28 -18
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@@ -125,6 +125,22 @@ bool fitsPrecisionBase2(bigint const& _mantissa, uint32_t _expBase2)
return fitsPrecisionBaseX(_mantissa, 1.0, _expBase2);
}
/// Checks whether _value fits into IntegerType _type.
bool fitsIntegerType(bigint const& _value, IntegerType const& _type)
{
return (_type.minValue() <= _value) && (_value <= _type.maxValue());
}
/// Checks whether _value fits into _bits bits when having 1 bit as the sign bit
/// if _signed is true.
bool fitsIntoBits(bigint const& _value, unsigned _bits, bool _signed)
{
return fitsIntegerType(_value, IntegerType(
_bits,
_signed ? IntegerType::Modifier::Signed : IntegerType::Modifier::Unsigned
));
}
}
void StorageOffsets::computeOffsets(TypePointers const& _types)
@@ -963,27 +979,21 @@ BoolResult RationalNumberType::isImplicitlyConvertibleTo(Type const& _convertTo)
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;
return fitsIntegerType(m_value.numerator(), targetType);
}
case Category::FixedPoint:
{
if (auto fixed = fixedPointType())
return fixed->isImplicitlyConvertibleTo(_convertTo);
return false;
FixedPointType const& targetType = dynamic_cast<FixedPointType const&>(_convertTo);
// Store a negative number into an unsigned.
if (isNegative() && !targetType.isSigned())
return false;
if (!isFractional())
return (targetType.minIntegerValue() <= m_value) && (m_value <= targetType.maxIntegerValue());
rational value = m_value * pow(bigint(10), targetType.fractionalDigits());
// Need explicit conversion since truncation will occur.
if (value.denominator() != 1)
return false;
return fitsIntoBits(value.numerator(), targetType.numBits(), targetType.isSigned());
}
case Category::FixedBytes:
return (m_value == rational(0)) || (m_compatibleBytesType && *m_compatibleBytesType == _convertTo);