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| author | Jeff Cohen <jeffc@jolt-lang.org> | 2005-10-23 04:37:20 +0000 |
|---|---|---|
| committer | Jeff Cohen <jeffc@jolt-lang.org> | 2005-10-23 04:37:20 +0000 |
| commit | 66c5fd6c537269eaef0f630fa14360dcaff6a295 (patch) | |
| tree | 90ec39b9c89faa77f29186419eb3f67def5383b1 /lib/Target/SubtargetFeature.cpp | |
| parent | 8b7f14e970d87eb52ac34e443bb508a403a2ac0d (diff) | |
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
Diffstat (limited to 'lib/Target/SubtargetFeature.cpp')
0 files changed, 0 insertions, 0 deletions