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Building a compiler in JRuby
- 1. Building a Miserably Fun Compiler in JRuby. Chris Umbel @chrisumbel http://www.chrisumbel.com Sunday, January 29, 12
- 2. Agenda Ruby/JRuby introduction Talk background Building a compiler Sunday, January 29, 12
- 3. Ruby Dynamic, but strongly typed. Object-oriented metaprogrammable Has multiple implementations (MRI, IronRuby, Rubinius, JRuby) Has functional features (Higher-order functions, blocks) Sunday, January 29, 12
- 4. Ruby Examples OO Data Structures Sunday, January 29, 12
- 5. JRuby Highly compatible Ruby implementation Written in Java/runs on the JVM Can consume arbitrary Java libraries Favorable concurrency characteristics to CRuby (no GIL) Sunday, January 29, 12
- 6. JRuby Examples Java types Using .jars conventions Sunday, January 29, 12
- 7. Inspiration Ian Dees @undees JRubyConf 2011 JRuby, Not Just for Hard-Headed Pragmatists Anymore Author: Using JRuby: Bringing Ruby to Java Sunday, January 29, 12
- 8. JRubyConf Practical problem solving Customers, Customers, Customers! ROI Sunday, January 29, 12
- 9. Thnad Just enough of a fictional programming language to show how to write a compiler https://github.com/undees/thnad Sort of JavaScript-ey Allusion to the greatest of classical literature Sunday, January 29, 12
- 10. What We’ll Build Lisp-style S-expressions Pure JRuby Compiles to Java bytecode Sunday, January 29, 12
- 11. What We’ll Use JRuby Parslet Kaspar Shiess Parser in pure Ruby Bitescript Charles Nutter JVM bytecode emitter for JRuby Sunday, January 29, 12
- 12. What it wont’ do Conditionals Non-parametric locally scoped variables OO Provide Java library support, standard or otherwise. Sunday, January 29, 12
- 13. What It’ll Do Basic math Functions Standard output Suck!!! Sunday, January 29, 12
- 14. sucklang Sunday, January 29, 12
- 15. Language Components Simple Atoms (identifiers; literal strings and integers) Lists Function calls Sunday, January 29, 12
- 16. sucklang Code Sample (defun foo [x y] (+ x y)) (println "result is " (foo 6 9)) Sunday, January 29, 12
- 17. Parts Parser Transmogrifier Compiler Sunday, January 29, 12
- 18. Step 1 Parser Numbers Basic list Whitespace handling Sunday, January 29, 12
- 19. Step 2 Parser Expressions Sunday, January 29, 12
- 20. Step 3 Parser Identifiers Atoms Lists in lists Operators are Identifiers Sunday, January 29, 12
- 21. Step 4 Parser Strings Sunday, January 29, 12
- 22. Step 5 Parser Vectors Sunday, January 29, 12
- 23. Step 6 Transmogrifier AST Sunday, January 29, 12
- 24. Step 7: STOP! javap - Java disassembler Sunday, January 29, 12
- 25. Step 8 bitescript example Sunday, January 29, 12
- 26. Step 9 compiler java requires/imports emitting of simple types Sunday, January 29, 12
- 27. Step 10 emitting of functions + println defun calls Sunday, January 29, 12
- 28. What It Did Parsed S-expressions into an AST Compiled AST to JVM bytecode Sucked (a lot of assumptions) Sunday, January 29, 12
- 29. What We’ve Learned Parslet Bitescript JVM innards Sunday, January 29, 12
- 30. Thank you! Sunday, January 29, 12