Ruby 1.9.0 and the debugger

ruby-talk
1

I've built Ruby 1.9 and all is well with that. With respects to using
the debugger, the README says "use rb_debug". Now does that mean
`require rb_debug` in an irb session or am I to recompile Ruby to
include support for the debugger?

irb(main):004:0> require rb_debug.rb
NameError: undefined local variable or method `rb_debug' for main:Object
        from (irb):4
        from /usr/local/lib/ruby/1.9.0/irb.rb:150:in `block (2 levels)
in eval_input' from /usr/local/lib/ruby/1.9.0/irb.rb:259:in
`signal_status' from /usr/local/lib/ruby/1.9.0/irb.rb:147:in `block in
eval_input' from /usr/local/lib/ruby/1.9.0/irb.rb:146:in `eval_input'
        from /usr/local/lib/ruby/1.9.0/irb.rb:70:in `block in start'
        from /usr/local/lib/ruby/1.9.0/irb.rb:69:in `catch'
        from /usr/local/lib/ruby/1.9.0/irb.rb:69:in `start'
        from /usr/local/bin/irb:13:in `<main>'

I've tried to find some docs on this via ri debug:-

More than one method matched your request. You can refine
your search by asking for information on one of:

     IRB::Context#debug_level=, IRB::Context#debug?, Logger#debug,
     Logger#debug?, Net::SMTP#debug_output=, Net::SMTP#set_debug_output,
     Net::HTTP#set_debug_output, Net::POP3#set_debug_output,
     Net::IMAP::debug=, Net::IMAP::debug, DEBUGGER__::debug_thread_info,
     DEBUGGER__#debug_silent_eval, DEBUGGER__#debug_variable_info,
     DEBUGGER__#debug_funcname, DEBUGGER__#debug_eval,
     DEBUGGER__#debug_method_info, DEBUGGER__#debug_command,
     DEBUGGER__#debug_print_help, WEBrick::BasicLog#debug,
     WEBrick::BasicLog#debug?, Shell::debug=, Shell#debug=,
     RubyLex::debug?, Ripper#yydebug=, Ripper#yydebug

Regards,

John Maclean
MSc (DIC)
+44 7739 171 531

2

require "rb_debug.rb"

You need to have the quotes around it, because it takes a String :slight_smile:

HTH,
Ari

···

On Jan 23, 2008, at 5:26 PM, John Maclean wrote:

I've built Ruby 1.9 and all is well with that. With respects to using
the debugger, the README says "use rb_debug". Now does that mean
`require rb_debug` in an irb session or am I to recompile Ruby to
include support for the debugger?

irb(main):004:0> require rb_debug.rb
NameError: undefined local variable or method `rb_debug' for main:Object

3

In article <20080123222649.3e1df242@x60s>,

···

John Maclean <john@jayeola.org> wrote:

I've built Ruby 1.9 and all is well with that. With respects to using
the debugger, the README says "use rb_debug". Now does that mean
`require rb_debug` in an irb session or am I to recompile Ruby to
include support for the debugger?

irb(main):004:0> require rb_debug.rb
NameError: undefined local variable or method `rb_debug' for main:Object
       from (irb):4
       from /usr/local/lib/ruby/1.9.0/irb.rb:150:in `block (2 levels)
in eval_input' from /usr/local/lib/ruby/1.9.0/irb.rb:259:in
`signal_status' from /usr/local/lib/ruby/1.9.0/irb.rb:147:in `block in
eval_input' from /usr/local/lib/ruby/1.9.0/irb.rb:146:in `eval_input'
       from /usr/local/lib/ruby/1.9.0/irb.rb:70:in `block in start'
       from /usr/local/lib/ruby/1.9.0/irb.rb:69:in `catch'
       from /usr/local/lib/ruby/1.9.0/irb.rb:69:in `start'
       from /usr/local/bin/irb:13:in `<main>'

I've tried to find some docs on this via ri debug:-

More than one method matched your request. You can refine
your search by asking for information on one of:

    IRB::Context#debug_level=, IRB::Context#debug?, Logger#debug,
    Logger#debug?, Net::SMTP#debug_output=, Net::SMTP#set_debug_output,
    Net::HTTP#set_debug_output, Net::POP3#set_debug_output,
    Net::IMAP::debug=, Net::IMAP::debug, DEBUGGER__::debug_thread_info,
    DEBUGGER__#debug_silent_eval, DEBUGGER__#debug_variable_info,
    DEBUGGER__#debug_funcname, DEBUGGER__#debug_eval,
    DEBUGGER__#debug_method_info, DEBUGGER__#debug_command,
    DEBUGGER__#debug_print_help, WEBrick::BasicLog#debug,
    WEBrick::BasicLog#debug?, Shell::debug=, Shell#debug=,
    RubyLex::debug?, Ripper#yydebug=, Ripper#yydebug

Regards,

John Maclean
MSc (DIC)
+44 7739 171 531

--
Ollivier ROBERT -=- EEC/RIF/SEU -=-
Systems Engineering Unit

4

John Maclean wrote:

I've built Ruby 1.9 and all is well with that. With respects to using
the debugger, the README says "use rb_debug". Now does that mean
`require rb_debug` in an irb session or am I to recompile Ruby to
include support for the debugger?

Ahh. For some reason I thought that since ruby-debug didn't work with
1.9 [yet] that there was no debugger for 1.9. But apparently there
is--the default built-in [albeit slow] one. Silly me.

Note also that there's "ruby unroller" if anybody wants to see the trace
of their program executing:
http://unroller.rubyforge.org/

i.e.

> > call_one
> > > return 3
> > more stuff

Cheers.
-=r

···

--
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