Maintaining the Perl 5 Core (Dave Mitchell): Grant Report for June 2017
Wed, 06-Sep-2017 by
Makoto Nozaki
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<pre>I spent June mainly:
* finishing off the heavy reworking of perl's internal sprintf implementation.
This has now been merged into blead. It contains about 100 commits which
fixes bugs, audits the code for possible integer overflows, makes the
code simpler - and simpler to understand - and improves performance by
around 15%.
* adding a proper test suite for Porting/bench.pl, and fixing the utility
up based on the test results. For example at some point the
--bisect option broke, but this was never noticed due to no testing.
* adding a DEBUGGING-build mechanism to detect some classes of
bug where pp functions fail to extend the stack before pushing return
values. Basically the runops loop sets a high water mark variable before
calling the pp function; EXTEND() and similar update that mark, and on
return from the pp function, we check whether PL_stack_sp is > the mark
and panic if so. This has allowed me to detect and fix several such bugs
in core.
Other than that I worked on a few miscellaneous RT tickets.
</pre>
<pre>SUMMARY:
15:41 RT #131260 sprintf implementation
0:37 RT #131555 heap-buffer-overflow
1:57 RT #131575 s// on utf8 string occasionally crashes
0:51 RT #131577 heap-use-after-free (READ of size 1) in S_reghop4()
21:25 add better tests for Porting/bench.pl
4:21 apply accumulated post-5.26 fixes
4:29 fix 32-bit builds
14:17 fix stack extend overruns
4:23 process p5p mailbox
2:00 sort out 5.27.1 version numbers
1:04 update perldelta
------
71:05 TOTAL (HH::MM)
199.1 weeks
2800.0 total hours
14.1 average hours per week
</pre>
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