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small fixes per chris's comments

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This commit is contained in:
Lu Guanqun 2015-02-10 22:43:13 +08:00
parent d307b0914c
commit 11b4e7f7d8
1 changed files with 6 additions and 6 deletions
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12
Types.cpp
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@ -26,6 +26,8 @@
#include <libsolidity/Types.h>
#include <libsolidity/AST.h>
#include <limits>
using namespace std;
namespace dev
@ -322,13 +324,11 @@ TypePointer IntegerConstantType::binaryOperatorResult(Token::Value _operator, Ty
break;
case Token::Exp:
if (other.m_value < 0)
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("exponent can't be negative"));
return TypePointer();
else if (other.m_value > std::numeric_limits<unsigned int>::max())
return TypePointer();
else
{
value = boost::multiprecision::powm(m_value, other.m_value, bigint(2) << 256);
if (value >= (bigint(1) << 256))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("exp result overflowed"));
}
value = boost::multiprecision::pow(m_value, other.m_value.convert_to<unsigned int>());
break;
default:
return TypePointer();