From: daz <dooby@...10.karoo.co.uk>
Date: 2003-06-01T14:39:42+09:00
Subject: 'line' trace event  (was Re: IF statement in ruby 1.8.0 ......)


"Yukihiro Matsumoto" <matz@ruby-lang.org> wrote:
>
> |> This could be 'bug-lite' in 1.7+ (or i386)?
> |
> |Bug or a feature ? ;-)
>
> A feature.  This is added to accomplish better debugger tracing.
> The call timing may be changed in the future.
>
> matz.
>


< abbreviated ri 1.8 description>
------------------------------------------------- Kernel::set_trace_func
     set_trace_func( aProc ) -> aProc
     set_trace_func( nil ) -> nil
------------------------------------------------------------------------

     Events are: c-call, c-return, call , class, end,
     line (execute code on a new line), raise and return.
</>


puts "ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}) [#{RUBY_PLATFORM}]"
set_trace_func proc {| ev, fi, li, oi, bi, cl |
  printf("(%8s)   %s:%-2d (%10s) %s %8s\n",
    ev, fi[-11,11], li, oi.inspect, bi.to_s, cl) if ev == 'line'
}
##- line 7
a =
 1
a = 2 if true
if true then a = 3 end
a -= 1 while a > 0


produces:-

ruby 1.8.0 (2003-05-15) [i386-mswin32]
(    line)   stf_line.rb:8  (       nil) #<Binding:0x257ab44>    false
(    line)   stf_line.rb:10 (       nil) #<Binding:0x257a97c>    false
(    line)   stf_line.rb:10 (       nil) #<Binding:0x257a1fc>    false
(    line)   stf_line.rb:11 (       nil) #<Binding:0x257a0c4>    false
(    line)   stf_line.rb:11 (       nil) #<Binding:0x2579f8c>    false
(    line)   stf_line.rb:11 (       nil) #<Binding:0x2579e54>    false
(    line)   stf_line.rb:12 (       nil) #<Binding:0x2579d1c>    false


Perhaps if calls other than the first were 'line+', the debugger could
accept 'line' and 'line+' while others could easily filter out the
extra detail.

We're not all 'node-dumpers' :-)


Very many thanks, Matz,


daz
--

"Not only that: He's handed out the fkn source code as well!"