[New-bugs-announce] [issue31338] Use abort() for code we never expect to hit
Barry A. Warsaw
report at bugs.python.org
Mon Sep 4 15:18:14 EDT 2017
New submission from Barry A. Warsaw:
Over in bpo-31337 the observation was made that we often use the following pattern in situations we never expect to hit:
assert(0);
return NULL;
but this isn't strictly optimal. First, the asserts can be compiled away. Second, it's possible that our assumptions about a particular condition are incorrect. Third, the intent of non-reachability isn't as clear as it could be.
As suggested in http://bugs.python.org/issue31337#msg301229 it would be better to use
abort() /* NOT REACHED */
instead (although @skrah says "The only drawback is that in the case of libraries, sometimes distribution package lint tools complain." so it would be useful to understand that in more detail.
@serhiy.storchaka says "I have counted 48 occurrences of assert(0), 11 assert(0 && "message") and 2 assert(!"message"). If fix one occurrence, why not fix all others?" We should! This issue tracks that.
----------
assignee: barry
components: Interpreter Core
messages: 301244
nosy: barry, serhiy.storchaka, skrah
priority: normal
severity: normal
status: open
title: Use abort() for code we never expect to hit
versions: Python 3.7
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31338>
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