The word before an assignment is inspected during definition is it is a
string. Parentheses prevent that. I'll fix it when I get back.
hhr
On Thu, Nov 2, 2023, 11:37 PM Raul Miller <rauldmil...@gmail.com> wrote:
> I don't think this kind of problem is that reliable.
>
> Anyways, running under gdb and triggering the bug, gets me:
>
> {{a.=.'oops'}}
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff28bd93a in jtcrelocalsyms (jt=0x7ffff13f8200,
> l=0x5555555c7700, c=0x5555555c7680, type=3, dyad=0, flags=262144)
> at ../../../../jsrc/cx.c:946
> 946 if(AN(neww)){ // ignore blank string
> (gdb) where
> #0 0x00007ffff28bd93a in jtcrelocalsyms (jt=0x7ffff13f8200,
> l=0x5555555c7700, c=0x5555555c7680, type=3, dyad=0, flags=262144)
> at ../../../../jsrc/cx.c:946
> #1 0x00007ffff28c0e13 in jtcolon (jt=0x7ffff13f8200, a=0x7ffff3a26740
> <Bnum+1344>, w=0x5555555c7380) at ../../../../jsrc/cx.c:1211
> #2 0x00007ffff2921039 in jtparsea (jt=0x7ffff13f8200,
> queue=0x5555555c75b8, nwds=5) at ../../../../jsrc/p.c:869
> #3 0x00007ffff291ec70 in jtparse (jt=0x7ffff13f8200,
> w=0x5555555c7580) at ../../../../jsrc/p.c:290
> #4 0x00007ffff292d645 in jtimmex (jt=0x7ffff13f8200,
> w=0x5555555c7580) at ../../../../jsrc/px.c:54
> #5 0x00007ffff28f71d9 in jtimmexexecct (jt=0x7ffff13f8200,
> x=0x5555555c7580) at ../../../../jsrc/io.c:382
> #6 0x00007ffff28f4f42 in jdo (jt=0x7ffff13f8000, lp=0x55555592de60
> "{{a.=.'oops'}}") at ../../../../jsrc/io.c:418
> #7 0x00007ffff28f4d25 in JDo (jt=0x7ffff13f8000, lp=0x55555592de60
> "{{a.=.'oops'}}") at ../../../../jsrc/io.c:523
> #8 0x0000555555557710 in jedo (sentence=0x55555592de60
> "{{a.=.'oops'}}") at ../../../../jsrc/jeload.c:92
> #9 0x000055555555724f in main (argc=1, argv=0x7fffffffe288) at
> ../../../../jsrc/jconsole.c:393
>
> And jtcrelocalsyms also gets called when parsing {{(a.)=.'oops'}} but
> I guess things have been initialized differently or something, because
> that doesn't crash.
>
> FYI,
>
> --
> Raul
>
>
> On Thu, Nov 2, 2023 at 6:23 PM Ian Clark <earthspo...@gmail.com> wrote:
> >
> > If so then shouldn't putting parentheses round (a.) still crash?
> > But it doesn't…
> >
> > {{(a.)=.'oops' y}}
> >
> > 3 : '(a.)=.''oops'' y'
> >
> >
> > This doesn't crash either:
> >
> >
> > {{a.,''=.'oops' y}}
> >
> > 3 : 'a.,''''=.''oops'' y'
> >
> >
> >
> >
> > On Thu, 2 Nov 2023 at 22:15, Raul Miller <rauldmil...@gmail.com> wrote:
> >
> > > I think what's happening in {{ a.=.'oops' }} is that the left hand
> > > side of =. is being inspected during parsing (because literal
> > > expressions are valid assignment targets), but J isn't prepared to
> > > deal with some of the characters which are present in this context.
> > >
> > > --
> > > Raul
> > >
> > > On Thu, Nov 2, 2023 at 6:07 PM Ian Clark <earthspo...@gmail.com>
> wrote:
> > > >
> > > > It does for me too on my Mac mini.
> > > >
> > > > JVERSION
> > > >
> > > > Engine: j903/j64/darwin
> > > >
> > > > Release-b: commercial/2022-01-28T04:07:40
> > > >
> > > > Library: 9.03.08
> > > >
> > > > Qt IDE: 1.9.5/5.15.2(5.15.2)
> > > >
> > > > Platform: Darwin 64
> > > >
> > > > Installer: J903 install
> > > >
> > > > InstallPath: /applications/j903
> > > >
> > > > Contact: www.jsoftware.com
> > > >
> > > >
> > > > After the 3rd or 4th crash I actually got an Apple crash report. The
> > > whole
> > > > thing is too long to insert here, but I have kept a copy.
> > > > The key part IMHO is this:
> > > >
> > > > +++++++++++++++++++++++++++++++++++
> > > > Notes:
> > > > PC register does not match crashing frame (0x0 vs 0x115314C97)
> > > >
> > > > Crashed Thread: 0 Dispatch queue: com.apple.main-thread
> > > >
> > > > Exception Type: EXC_BAD_ACCESS (SIGSEGV)
> > > > Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000028
> > > > Exception Codes: 0x0000000000000001, 0x0000000000000028
> > > >
> > > > Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault:
> 11
> > > > Terminating Process: exc handler [1282]
> > > >
> > > > VM Region Info: 0x28 is not in any region. Bytes before following
> > > region:
> > > > 140723209813976
> > > > REGION TYPE START - END [ VSIZE]
> PRT/MAX
> > > > SHRMOD REGION DETAIL
> > > > UNUSED SPACE AT START
> > > > --->
> > > > mapped file 7ffcaceec000-7ffcd260c000 [599.1M]
> r-x/r-x
> > > > SM=COW ...t_id=e024f55b
> > > >
> > > > Error Formulating Crash Report:
> > > > PC register does not match crashing frame (0x0 vs 0x115314C97)
> > > > +++++++++++++++++++++++++++++++++++
> > > >
> > > > AFAICT you can replace 'oops' with a string, name or numeral to get
> the
> > > > crash. (Not tested extensively.)
> > > >
> > > >
> > > > On Thu, 2 Nov 2023 at 21:33, Raul Miller <rauldmil...@gmail.com>
> wrote:
> > > >
> > > > > This reliably crashes J for me (all versions since j902, but j901
> > > > > didn't support the {{ }} notation).
> > > > >
> > > > > {{ a.=.'oops' y }}
> > > > >
> > > > > FYI,
> > > > >
> > > > > --
> > > > > Raul
> > > > >
> ----------------------------------------------------------------------
> > > > > For information about J forums see
> http://www.jsoftware.com/forums.htm
> > > > >
> > > >
> ----------------------------------------------------------------------
> > > > For information about J forums see
> http://www.jsoftware.com/forums.htm
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> > >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
