Ruby Debug
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This document discusses using the ruby-debug gem to debug Ruby code. It provides instructions on installing ruby-debug for different Ruby versions and describes basic usage like starting a program or Rails server in the debugger. It also overviews important debugger commands for evaluating expressions, viewing variables and methods, moving execution, and determining the call stack. Alternative debugging options like rack-debug and ruby-debug-ide integrations are also mentioned.
![Notch8.com Ruby Debugger
Slide No. 7
Most Important
h[elp]
Displays the help message for an item or the list of
commands
(rdb:1) help delete
del[ete][ nnn...] delete some or all breakpoints
(rdb:1) help
Available commands:
backtrace delete enable help list ps save thread
var break disable eval info method putl set tmate
where catch display exit irb next quit show trace
condition down finish jump p reload source undisplay
continue edit frame kill pp restart step up](https://image.slidesharecdn.com/rubydebug-120418230811-phpapp01/85/Ruby-Debug-7-320.jpg)
![Notch8.com Ruby Debugger
Slide No. 8
Seeing
disp[lay] expression
Displays value of expression
undisp[lay] [ n]
Removes display of n
p expression
Evaluates the expression
m[ethod] i[instance] object
Displays instance methods of object
m[ethod] class| module
Displays instance methods of the class or module](https://image.slidesharecdn.com/rubydebug-120418230811-phpapp01/85/Ruby-Debug-8-320.jpg)
![Notch8.com Ruby Debugger
Slide No. 9
Seeing
v[ar] g[lobal]
Displays global variables
v[ar] l[ocal]
Displays local variables
v[ar] i[instance] object
Displays instance variables of object
v[ar] c[onst] object
Displays constants of object](https://image.slidesharecdn.com/rubydebug-120418230811-phpapp01/85/Ruby-Debug-9-320.jpg)
![Notch8.com Ruby Debugger
Slide No. 10
Moving
c[ont]
Continues execution
s[tep] [ n]
Executes next n lines stepping into methods
n[ext] [ n]
Executes next n lines stepping over methods
fin[ish]
Finishes execution of the current method
q[uit]
Exits debugger](https://image.slidesharecdn.com/rubydebug-120418230811-phpapp01/85/Ruby-Debug-10-320.jpg)
![Notch8.com Ruby Debugger
Slide No. 11
Where am I?
w[here]
Displays stack frame
l[ist][<-| n- m>]
Displays source lines from n to m
up [ n]
Moves up n levels in the stack frame
down [ n]
Moves down n levels in the stack frame](https://image.slidesharecdn.com/rubydebug-120418230811-phpapp01/85/Ruby-Debug-11-320.jpg)
Ruby Debug
- 1. Notch8.com Slide No. 1 by Rob Kaufman [email protected] http://notch8.com http://www.slideshare.net/notch8 http://speakerrate.com/notch8 @orangewolf
- 2. Notch8.com Ruby Debugger Slide No. 2 Ruby Debugger: Beyond “puts”
- 3. Notch8.com Ruby Debugger Slide No. 3 Installation Ruby 1.8 gem install ruby-debug Ruby 1.9.2 gem install ruby-debug19 Ruby 1.9.3 see http://blog.wyeworks.com/2011/11/1/ruby-1-9-3-and- ruby-debug
- 4. Notch8.com Ruby Debugger Slide No. 4 Bundler group :test, :development do gem "ruby-debug", :platform => :ruby_18 gem "ruby-debug19", :platform => :ruby_19 end
- 5. Notch8.com Ruby Debugger Slide No. 5 Basic Usage Starting a program in the debugger rdebug my_file.rb Starting with a running program 'debugger' statement Starting the Rails server rails server --debugger
- 6. Notch8.com Ruby Debugger Slide No. 6 Debugger Commands backtrace putl finish delete set jump enable tmate p help where reload list catch source ps display undisplay save exit continue thread irb edit var next frame break quit kill disable show pp eval trace restart info condition step method down up
- 7. Notch8.com Ruby Debugger Slide No. 7 Most Important h[elp] Displays the help message for an item or the list of commands (rdb:1) help delete del[ete][ nnn...] delete some or all breakpoints (rdb:1) help Available commands: backtrace delete enable help list ps save thread var break disable eval info method putl set tmate where catch display exit irb next quit show trace condition down finish jump p reload source undisplay continue edit frame kill pp restart step up
- 8. Notch8.com Ruby Debugger Slide No. 8 Seeing disp[lay] expression Displays value of expression undisp[lay] [ n] Removes display of n p expression Evaluates the expression m[ethod] i[instance] object Displays instance methods of object m[ethod] class| module Displays instance methods of the class or module
- 9. Notch8.com Ruby Debugger Slide No. 9 Seeing v[ar] g[lobal] Displays global variables v[ar] l[ocal] Displays local variables v[ar] i[instance] object Displays instance variables of object v[ar] c[onst] object Displays constants of object
- 10. Notch8.com Ruby Debugger Slide No. 10 Moving c[ont] Continues execution s[tep] [ n] Executes next n lines stepping into methods n[ext] [ n] Executes next n lines stepping over methods fin[ish] Finishes execution of the current method q[uit] Exits debugger
- 11. Notch8.com Ruby Debugger Slide No. 11 Where am I? w[here] Displays stack frame l[ist][<-| n- m>] Displays source lines from n to m up [ n] Moves up n levels in the stack frame down [ n] Moves down n levels in the stack frame
- 12. Notch8.com Ruby Debugger Slide No. 12 There are others: Setting and clearing breakpoints and watchpoints Thread manipulation
- 13. Notch8.com Ruby Debugger Slide No. 13 What if I'm in Passenger Rack-debug https://github.com/ddollar/rack-debug Add “rack-debug” to Gemfile for development In config/environments/development.rb require 'rack/debug' # for rails 2.3.x config.middleware.use 'Rack::Debug' # for rails 3.0.x config.middleware.use Rack::Debug Add “require 'rack-debug/tasks'” to Rakefile Restart passenger Run the listener “rake debug”
- 14. Notch8.com Ruby Debugger Slide No. 14 What if I'm Using an IDE? Ruby-debug-ide integrates with Emacs, Vim, Rubymine, etc
- 15. Notch8.com Ruby Debugger Slide No. 15 Next Steps The Rails Guide http://guides.rubyonrails.org/debugging_rails_applications.html Checkout Pry http://pry.github.com/
- 16. Notch8.com Slide No. 16 by Rob Kaufman [email protected] http://notch8.com http://www.slideshare.net/notch8 http://speakerrate.com/notch8 @orangewolf