Fix undefined behavior: left-shifting into the sign bit.
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Authored by kib on Dec 21 2019, 5:05 PM.

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emaste
dim
markj

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rS356039: Fix undefined behavior: left-shifting into the sign bit.

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rS FreeBSD src repository - subversion

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kib created this revision.Dec 21 2019, 5:05 PM

Herald added a subscriber: imp. · View Herald TranscriptDec 21 2019, 5:05 PM

Harbormaster completed remote builds in B28277: Diff 65892.Dec 21 2019, 5:06 PM

markj accepted this revision.Dec 21 2019, 6:58 PM

This revision is now accepted and ready to land.Dec 21 2019, 6:58 PM

LGTM. Are any users of the macros affected, btw?

In D22898#501463, @dim wrote:

Are any users of the macros affected, btw?

I do not think that anything is affected for real, otherwise we would already have reports e.g. about threading breakage due to SIGTHR == 32.
This is only a preventive measure against compiler writers trying to make our life hard.

Closed by commit rS356039: Fix undefined behavior: left-shifting into the sign bit. (authored by kib). · Explain WhyDec 23 2019, 8:18 PM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rS356039: Fix undefined behavior: left-shifting into the sign bit..

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Path

Size

head/

sys/

_sigset.h

2 lines

bitset.h

2 lines

Diff 65934

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head/sys/sys/_sigset.h