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Merge pull request #1274 from ethereum/signed-exp

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Banning signed exp
This commit is contained in:
chriseth 2016-10-26 14:28:10 +02:00 committed by GitHub
commit 34e2209bcc
3 changed files with 21 additions and 1 deletions
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1
Changelog.md
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@ -3,6 +3,7 @@
Features:
Bugfixes:
* Type checker: forbid signed exponential that led to an incorrect use of EXP opcode.
### 0.4.3 (2016-10-25)

5
libsolidity/ast/Types.cpp
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@ -349,11 +349,14 @@ TypePointer IntegerType::binaryOperatorResult(Token::Value _operator, TypePointe
return commonType;
if (Token::isBooleanOp(_operator))
return TypePointer();
// Nothing else can be done with addresses
if (auto intType = dynamic_pointer_cast<IntegerType const>(commonType))
{
// Nothing else can be done with addresses
if (intType->isAddress())
return TypePointer();
// 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)

16
test/libsolidity/SolidityNameAndTypeResolution.cpp
View File

@ -2098,6 +2098,22 @@ BOOST_AUTO_TEST_CASE(integer_boolean_operators)
BOOST_CHECK(expectError(sourceCode3) == Error::Type::TypeError);
}
BOOST_AUTO_TEST_CASE(exp_signed_variable)
{
char const* sourceCode1 = R"(
contract test { function() { uint x = 3; int y = -4; x ** y; } }
)";
BOOST_CHECK(expectError(sourceCode1) == Error::Type::TypeError);
char const* sourceCode2 = R"(
contract test { function() { uint x = 3; int y = -4; y ** x; } }
)";
BOOST_CHECK(expectError(sourceCode2) == Error::Type::TypeError);
char const* sourceCode3 = R"(
contract test { function() { int x = -3; int y = -4; x ** y; } }
)";
BOOST_CHECK(expectError(sourceCode3) == Error::Type::TypeError);
}
BOOST_AUTO_TEST_CASE(reference_compare_operators)
{
char const* sourceCode1 = R"(