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Type after shift should be type of left operand.

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This commit is contained in:
chriseth 2016-12-05 18:40:50 +01:00
parent b8b4f5e9f9
commit 2df60bec92
2 changed files with 57 additions and 5 deletions
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47
libsolidity/ast/Types.cpp
View File

@ -340,6 +340,28 @@ TypePointer IntegerType::binaryOperatorResult(Token::Value _operator, TypePointe
_other->category() != category()
)
return TypePointer();
if (Token::isShiftOp(_operator))
{
// Disable >>> here.
if (_operator == Token::SHR)
return TypePointer();
// Shifts are not symmetric with respect to the type
if (isAddress())
return TypePointer();
if (IntegerType const* otherInt = dynamic_cast<decltype(otherInt)>(_other.get()))
{
if (!otherInt->isAddress())
return shared_from_this();
}
else if (RationalNumberType const* otherRat = dynamic_cast<decltype(otherRat)>(_other.get()))
{
if (!otherRat->isFractional())
return shared_from_this();
}
return TypePointer();
}
auto commonType = Type::commonType(shared_from_this(), _other); //might be a integer or fixed point
if (!commonType)
return TypePointer();
@ -347,11 +369,6 @@ TypePointer IntegerType::binaryOperatorResult(Token::Value _operator, TypePointe
// All integer types can be compared
if (Token::isCompareOp(_operator))
return commonType;
// Disable >>> here.
if (_operator == Token::SHR)
return TypePointer();
if (Token::isShiftOp(_operator) && !isAddress()) // && !_other->isAddress())
return shared_from_this();
if (Token::isBooleanOp(_operator))
return TypePointer();
if (auto intType = dynamic_pointer_cast<IntegerType const>(commonType))
@ -959,6 +976,26 @@ TypePointer FixedBytesType::unaryOperatorResult(Token::Value _operator) const
TypePointer FixedBytesType::binaryOperatorResult(Token::Value _operator, TypePointer const& _other) const
{
if (Token::isShiftOp(_operator))
{
// Disable >>> here.
if (_operator == Token::SHR)
return TypePointer();
// Shifts are not symmetric with respect to the type
if (IntegerType const* otherInt = dynamic_cast<decltype(otherInt)>(_other.get()))
{
if (!otherInt->isAddress())
return shared_from_this();
}
else if (RationalNumberType const* otherRat = dynamic_cast<decltype(otherRat)>(_other.get()))
{
if (!otherRat->isFractional())
return shared_from_this();
}
return TypePointer();
}
auto commonType = dynamic_pointer_cast<FixedBytesType const>(Type::commonType(shared_from_this(), _other));
if (!commonType)
return TypePointer();

15
test/libsolidity/SolidityEndToEndTest.cpp
View File

@ -8505,6 +8505,21 @@ BOOST_AUTO_TEST_CASE(shift_left_uint8)
BOOST_CHECK(callContractFunction("f(uint8,uint8)", u256(0x66), u256(8)) == encodeArgs(u256(0)));
}
BOOST_AUTO_TEST_CASE(shift_left_larger_type)
{
char const* sourceCode = R"(
contract C {
function f() returns (int8) {
uint8 x = 255;
int8 y = 1;
return a << b;
}
}
)";
compileAndRun(sourceCode, 0, "C");
BOOST_CHECK(callContractFunction("f()") == encodeArgs(u256(1) << 255));
}
BOOST_AUTO_TEST_CASE(shift_left_assignment)
{
char const* sourceCode = R"(