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Overflow on signed integers is undefined behavior. Perl does whatever
the underlying compiler does in this case. Previously this file used a
wildcard which could specify more functions than we really expect to see
this potential overflow from. It is safer to mention explicitly all the
functions.
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It is undefined behavior to shift a negative integer to the left. This
commit avoids that by treating the value as unsigned, then casting back
to integer for return.
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This function numifies the field width string in something like
printf "%10f". It handles integer overflow itself, so suppress
ASan warnings, e.g.
sv.c:10716:26: runtime error: signed integer overflow: 922337203 * 10 cannot be represented in type 'int'
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<< in perl maps directly to << in C, so don't warn about it when the RHS
is too big.
Fixes e.g.:
print 1 << 64
use integer; print 1 << 63
Typical ASan warning:
pp.c:1893:2: runtime error: left shift of 1 by 63 places cannot be represented in type 'IV' (aka 'long')
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"clang -fsanitize=undefined" produces lots of false positives.
This file allows certain functions to be excluded from checking.
Use it as:
clang -fsanitize=undefined -fsanitize-blacklist=`pwd`/asan_ignore
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