tree 90ec39b9c89faa77f29186419eb3f67def5383b1
parent 8b7f14e970d87eb52ac34e443bb508a403a2ac0d
author Jeff Cohen <jeffc@jolt-lang.org> 1130042240 +0000
committer Jeff Cohen <jeffc@jolt-lang.org> 1130042240 +0000

When a function takes a variable number of pointer arguments, with a zero
pointer marking the end of the list, the zero *must* be cast to the pointer
type.  An un-cast zero is a 32-bit int, and at least on x86_64, gcc will
not extend the zero to 64 bits, thus allowing the upper 32 bits to be
random junk.

The new END_WITH_NULL macro may be used to annotate a such a function
so that GCC (version 4 or newer) will detect the use of un-casted zero
at compile time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23888 91177308-0d34-0410-b5e6-96231b3b80d8