Presentation about how Ruby processes and executes your code and how it can help you to find bugs and speed up some of your code.

1. Digging into Ruby guts

2. For why?
●
Become a better developer
–
If you know internals of your language, you'll use it
more efficient
–
If you will understand more, you can help
community
●
Improve your knowledge of computer science
●
Just for fun, you know

3. How Ruby reads your code

4. How Ruby executes your code

5. What is the tokens?
10.times { |n| puts n }
●
tINTEGER
●
tIDENTIFIER
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keyword_do, |tIDENTIFIER|
Ripper class — Ruby lexical analyzer
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/ripper/rdoc/Ripper.html

6. How it parses?
●
Bison (Yacc descendant)
●
Samples of grammar rules
●
Ruby code roadmap:
–
Ruby source code
–
Tokens
–
AST Nodes
–
YARV Instructions

7. And we need to go deeper

8. What the hell is YARV?
YARV (Yet Another Ruby Virtual Machine)
–
Stack-oriented virtual machine
–
Developed by Koichi Sasada (mostly)
–
Finally, it's double stack machine
–
Tracing of ruby code using YARV
–
Well-documented, really ( スタックに self をプッ
シュする )

9. How it works?
Little workshop

10. RubyVM module
●
Well-documented, you know, as before ( スタッ
クに self をプッシュする )
●
http://www.ruby-doc.org/core-2.0.0/RubyVM.html
●
Container for RubyVM::InstructionSequence

11. Benefits
●
Speed up your templates by precompiling
●
Use functional style programming
●
Trace your program if bug is hard to find

12. Bytecode Compilation
Rubinius is not needed anymore. At least,
runtime.
(little demonstration)
https://github.com/haml/haml/issues/674
https://gist.github.com/Paxa/321be47319327e5e7058

13. Tail Call Optimization
Just for functional programming addicts
(another little demonstration)

14. Where to find more?
●
Ruby under the microscope
●
Ruby sources
●
http://lmgtfy.com/?q=RubyVM
●
https://www.ruby-forum.com/forum/ruby-core
●
http://rxr.whitequark.org/mri/source/iseq.c

15. We are hiring. Take a contacts ;)

16. Mikhail Bortnyk
vessimir@gmail.com
Skype: mikhail.bortnyk
https://github.com/vessi/rubymeditation3_yarv