Digging into Ruby Guts

Digging into Ruby guts

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

How Ruby reads your code

How Ruby executes your code

What is the tokens?

10.times { |n| puts n }● tINTEGER● tIDENTIFIER● keyword_do, |tIDENTIFIER|

Ripper class — Ruby lexical analyzerhttp://www.ruby-doc.org/stdlib-1.9.3/libdoc/ripper/rdoc/Ripper.html

How it parses?

● Bison (Yacc descendant)● Samples of grammar rules● Ruby code roadmap:

– Ruby source code

– Tokens

– AST Nodes

– YARV Instructions

And we need to go deeper

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 )

How it works?

Little workshop

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

Benefits

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

Bytecode Compilation

Rubinius is not needed anymore. At least, runtime.

(little demonstration)

https://github.com/haml/haml/issues/674https://gist.github.com/Paxa/321be47319327e5e7058

Tail Call Optimization

Just for functional programming addicts(another little demonstration)

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

We are hiring. Take a contacts ;)

Mikhail Bortnykvessimir@gmail.com

Skype: mikhail.bortnyk

https://github.com/vessi/rubymeditation3_yarv