http://llvm.org/bugs/show_bug.cgi?id=21530
Bug ID: 21530
Summary: Detect integer demotions in UBSan
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
UBSan currently does not check integer demotions i.e. casts from wider integer
type to a smaller one. This is indeed not undefined behavior but rather
implementation defined. Still, loosing higher bits when downcasting ints to
chars is a constant source of bugs and it would be nice to have an optional
check for it (like we already have for float-cast-overflow).
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