RubyConf Bangladesh 2017 - Core Ruby: How it works
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This document describes the process Ruby code goes through before being executed: 1. Tokenization breaks the code into individual tokens like integers, identifiers, keywords. 2. Parsing uses grammar rules to organize the tokens into an abstract syntax tree (AST) that represents the code structure. 3. Compilation converts the AST into bytecode that the Ruby virtual machine (YARV) can execute for improved performance over interpreting the AST directly.
RubyConf Bangladesh 2017 - Core Ruby: How it works
- 1. CORE RUBY: HOW IT WORKS Back to Basics
- 3. Why Ruby?
- 4. A Journey To RUBY My code’s journey through Ruby Sample.r b Tokenize Parse Compile YARV instructio ns Tokens AST Nodes
- 5. Your Code has a long road to take before Ruby ever runs it. - Pat Shaughnessy Starter
- 6. Tokenization 1 0 . t i m e s d o | n | . t i m e s d o | n | tINTEG ER 10
- 7. Tokenization (Cont.) . t i m e s d o | n | tINTEG ER 10 t i m e s d o | n | tINTEG ER 10 . tINTEG ER 10 . tIDENTIFIE R times Keyword_do | | tIDENTIFIE R n
- 9. Parsing Ruby uses a parse.c file, which is a parser generator. It consists a parse.y file which contains grammar rules Parser generator: - input: tokens - output: tokens that follow the grammar rules parse.c file uses LALR (Look-ahead Left Reversed Rightmost Derivation) Algorithm
- 10. Parsing (Cont.)
- 11. Parsing (Cont.) AST (Abstract Syntax Tree) program binary Integer 5 plus Integer 5
- 12. Compilation Before Ruby 1.9, there was no compiler. Using YARV, you compile your code into bytecode (like JVM) JVM compiles the bytecode with JIT compiler, Ruby interprets the bytecode
- 13. Hey, Isn’t it too complex?
- 14. Compilation (Cont.) Why this extra compiler added from version 1.9? Answer: Speed. A compiled program with YARV is much faster (~ 4.25 times) than traversing AST nodes. Okay, Now what? Answer: Now let’s taste the magic of Ruby. Thanks to “Matz”. Enough! Why do we need this actually? Isn’t it awesome to know how a language works internally?
- 15. From, Dohatec Thanks, I’m Imtiaz Hossain Emu