Re: DAVEM TPF grant#2 weekly report for weeks #191-#194

(this report covers 3 weeks)

Been a bit of a slow time as I've had a cold/flu and family issues.

The main thing I did was 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)}) {
        ....
    }


2018/01/02
     1:43 process p5p mailbox
     0:20 OP_MULTICONCAT signed/unsigned issue
     2:05 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/03
     2:10 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/04
     4:34 RT #132608 heap-buffer-overflow in Perl_do_trans

# ----

2018/01/08
     0:30 process p5p mailbox
     4:21 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/09
     3:11 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/10
     0:13 process p5p mailbox
     1:08 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/11
     3:33 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/12
     4:22 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/13
     2:21 RT #132608 heap-buffer-overflow in Perl_do_trans


# ----

2018/01/15
     5:19 RT #132608 heap-buffer-overflow in Perl_do_trans

2018/01/17
     5:00 RT #132141: lvalue return broken in signature

2018/01/18
     1:30 RT #132141: lvalue return broken in signature
     0:56 SEGV in t/re/pat.t

2018/01/19
     2:54 RT #132608 heap-buffer-overflow in Perl_do_trans


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
      0:56 SEGV in t/re/pat.t
      2:26 process p5p mailbox
    ------
     46:10 TOTAL (HH::MM)


-- 
This is a great day for France!
    -- Nixon at Charles De Gaulle's funeral

• DAVEM TPF grant#2 weekly report #188 by Dave Mitchell
• DAVEM TPF grant#2 weekly report for weeks #189-#191 by Dave Mitchell
• Re: DAVEM TPF grant#2 weekly report for weeks #191-#194 by Dave Mitchell
• DAVEM TPF grant#2 weekly report for weeks #195-#197 by Dave Mitchell