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Bug 768538 - 1/2 - Fix undefined behavior in CheckedInt - r=jwalden

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This commit is contained in:
Benoit Jacob 2012-07-05 10:13:13 -04:00
parent e6fb01b882
commit 457f2bf3b9
1 changed files with 6 additions and 4 deletions
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10
mfbt/CheckedInt.h
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@ -678,11 +678,13 @@ inline CheckedInt<T> operator OP(const CheckedInt<T> &lhs, \
{ \
T x = lhs.mValue; \
T y = rhs.mValue; \
T result = x OP y; \
T isOpValid = detail::Is##NAME##Valid(x, y); \
/* Help the compiler perform RVO (return value optimization). */ \
return CheckedInt<T>(result, \
lhs.mIsValid && rhs.mIsValid && isOpValid); \
if (isOpValid) { \
T result = x OP y; \
return CheckedInt<T>(result, lhs.mIsValid && rhs.mIsValid); \
} else { \
return CheckedInt<T>(T(0), false); \
} \
}
MOZ_CHECKEDINT_BASIC_BINARY_OPERATOR(Add, +)