This is a monthly report by Dave Mitchell on his grant under Perl 5 Core Maintenance Fund. We thank the TPF sponsors to make this grant possible.
The main thing I did last month was to fix a bunch of issues with tr///c. Initially I was just working on a particular ticket, then noticed that tr///c was almost completed untested in core, and had a bunch of issues, and I ended up rewriting most of the implementation for tr/nonutf8/nonutf8/c (with or without the /s and /d flags).
From the merge commit, v5.27.7-203-gb1f1599:
This branch does the following:
Fixes an issue with tr/non_utf8/long_non_utf8/c, where
length(long_non_utf8) > 0x7fff.
Fixes an issue with tr/non_utf8/non_utf8/cd: basically, the
implicit \x{100}-\x{7fffffff} added to the searchlist by /c wasn't being
added.
Adds a lot of code comments to the various tr/// functions.
Adds tr///c tests - basically /c was almost completely untested.
Changes the layout of the op_pv transliteration table: it used to be roughly
256 x short - basic table
1 x short - length of extended table (n)
n x short - extended table
where the 2 and 3rd items were only present under /c. Its now
1 x Size_t - length of table (256+n)
(256+n) x short - table - both basic and extended
where n == 0 apart from under /c.
The new table format also allowed the tr/non_utf8/non_utf8/ code branches
to be considerably simplified.
op_dump() now dumps the contents of the (non-utf8 variant) transliteration
table.
Removes I32's from the tr/non_utf8/non_utf8/ code paths, making it fully
64-bit clean.
Improves the pod for tr///.
The other thing of note I did was to move sub attributes back before the
signature, because attributes need to be able to affect the compilation of
code within the signature, e.g.
sub f :lvalue ($a = do { $x = "abc"; return substr($x,0,1)}) {
....
}
SUMMARY:
0:20 OP_MULTICONCAT signed/unsigned issue
6:30 RT #132141: lvalue return broken in signature
35:58 RT #132608 heap-buffer-overflow in Perl_do_trans
2:22 RT #132772: MULTICONCAT: Geo-StreetAddress-US-1.04 affected too
0:56 SEGV in t/re/pat.t
0:55 [perl #131648] Out-of-bounds read in S_regmatch
2:26 process p5p mailbox
------
49:27 TOTAL (HH::MM)
224.4 weeks
2962.4 total hours
13.2 average hours per week
There are 171 hours left on the grant.