Re: [Bug-apl] )CONTINUE crashes

[David B. Lamkins]

I'm glad you found an underlying cause.

This bug turned out to be difficult to isolate. It seems that the
problem is structural in nature. It's not *only* the presence of the '',
but also related to the structure of that variable.

I found that I could make the problem go away by deleting lines from the
test function. Even though the remaining lines still contain '', it's
the presence of *all* of those lines (or some important subset that I
failed to isolate) that somehow tickles the bug.

Just so you know: this bug is *not* blocking my work.

On Fri, 2014-06-13 at 20:02 +0200, Juergen Sauermann wrote:
> Hi David,
> 
> thanks for preparing the testcase.
> I believe I have found the reason (some well known constants like ''
> are not being saved),
> but I need a little longer to fix it.
> 
> /// Jürgen
> 
> 
> On 06/13/2014 05:13 AM, David Lamkins wrote:
> 
> > Here's the smallest test case I've been able to isolate:
> > 
> > 
> > ---- file: foo.apl ----
> > ⍝!
> > 
> > ∇foo;cmd_info
> >  cmd_info←⍬
> >  cmd_info←cmd_info, ⊂('help' '[command]' '')
> >  cmd_info←cmd_info, ⊂('ident' '' '')
> >  cmd_info←cmd_info, ⊂('packages' '' '')
> >  cmd_info←cmd_info, ⊂('read' 'package-name' '[document-id]')
> >  cmd_info←cmd_info, ⊂('depends' 'package-name' '')
> >  cmd_info←cmd_info, ⊂('metadata' 'package-name' '')
> >  cmd_info←cmd_info, ⊂('load' 'package-name' '')
> >  cmd_info←cmd_info, ⊂('expunge' 'package-name' '')
> >  cmd_info←cmd_info, ⊂('new' 'package-name' '')
> >  cmd_info←cmd_info, ⊂('init' 'directory' '')
> >  cmd_info←cmd_info, ⊂('rescan' '' '')
> >  cmd_info←cmd_info, ⊂('names' 'prefix' '')
> >  cmd_info←cmd_info, ⊂('debug' '[on|off]' '')
> > ∇
> > 
> > ---- end file ----
> > 
> > 
> > 
> > In GNU APL:
> > 
> >       )load foo
> > loading )DUMP file /home/dlamkins/APL/workspaces/foo.apl...
> > WAS CLEAR WS
> >       )continue
> > WAS foo
> > 
> > ==============================================================================
> > Assertion failed: sub_idx < values.size()
> > in Function:      save
> > in file:          Archive.cc:715
> > 
> > Call stack:
> > 
> > ----------------------------------------
> > -- Stack trace at Archive.cc:715
> > ----------------------------------------
> > 0x7f425d252d65 __libc_start_main
> > 0x435f45  main
> > 0x5298dd   Workspace::immediate_execution(bool)
> > 0x46cc45    Command::process_line()
> > 0x46cbdf     Command::process_line(UCS_string&)
> > 0x46c525      Command::do_APL_command(std::ostream&, UCS_string&)
> > 0x469a74       Command::cmd_CONTINUE(std::ostream&)
> > 0x52cbca        Workspace::save_WS(std::ostream&,
> > std::vector<UCS_string, std::allocator<UCS_string> >&)
> > 0x44146c         XML_Saving_Archive::save()
> > 0x443bd1          do_Assert(char const*, char const*, char const*,
> > int)
> > ========================================
> > 
> > SI stack:
> > 
> > 
> > ==============================================================================
> > *** immediate_execution() caught other exception ***
> > 
> > 
> > ====================================================
> > SEGMENTATION FAULT
> > 
> > ----------------------------------------
> > -- Stack trace at main.cc:121
> > ----------------------------------------
> > 0x7f425d252d65 __libc_start_main
> > 0x435f45  main
> > 0x529967   Workspace::immediate_execution(bool)
> > 0x5006ee    TestFiles::apl_error(char const*)
> > 0x7f425ef23750     
> > 0x48623a      
> > ========================================
> > ====================================================
> > 
> > 
> > Process apl exited abnormally with code 3
> > 
> > 
> > IMPORTANT: Remember to delete CONTINUE.xml before attempting to
> > restart APL.
> > 
> > 
> > 
> > 
> > 
> > On Thu, Jun 12, 2014 at 12:17 PM, David Lamkins <address@hidden>
> > wrote:
> >         This is a preliminary report. I haven't isolated a root
> >         cause.
> >         
> >         
> >         When my package manager is in the workspace, doing )CONTINUE
> >         crashes APL. Furthermore, APL can't be used (it launches,
> >         but never becomes ready for input) until CONTINUE.xml is
> >         removed.
> >         
> >         
> >         I'll see what I can do tonight to come up with a brief test
> >         case. Meanwhile, you should be able to reproduce the issue
> >         by installing and loading the package manager obtained from:
> >         
> >         https://github.com/TieDyedDevil/apl-pkg
> >         
> >         
> >         -- 
> >         "The secret to creativity is knowing how to hide your
> >         sources."
> >            Albert Einstein
> >         
> >         
> >         http://soundcloud.com/davidlamkins
> >         http://reverbnation.com/lamkins
> >         http://reverbnation.com/lcw
> >         http://lamkins-guitar.com/
> >         http://lamkins.net/
> >         http://successful-lisp.com/
> > 
> > 
> > 
> > -- 
> > "The secret to creativity is knowing how to hide your sources."
> >    Albert Einstein
> > 
> > 
> > http://soundcloud.com/davidlamkins
> > http://reverbnation.com/lamkins
> > http://reverbnation.com/lcw
> > http://lamkins-guitar.com/
> > http://lamkins.net/
> > http://successful-lisp.com/
>