MacRuby, an introduction

A quick introduction to MacRuby Objective-C, Cocoa, LLVM, Grand Central and other musings Olivier Gutknecht - OSDC.fr - Oct. 3 2009

Olivier Gutknecht olg@no-distance.net twitter : olg MacRuby iCal, iSync, [...] co-founder Active lurker Server Software

Breaking News ! MacRuby developer attacked by raptors

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MacRuby

Mac OS X Stack Applications Application Frameworks Cocoa, WebKit, ... Core Technologies CoreGraphics, CoreFoundation, ... Darwin Kernel, userland, libdispatch, ...

Ruby on OS X 2002 Mac OS X 10.2 Ruby 1.6.7 2005 Mac OS X 10.4 Ruby 1.8.2 2007 Mac OS X 10.5 Ruby 1.8.6 RubyCocoa, gems, Rails 2009 Mac OS X 10.6 Ruby 1.8.7 RubyCocoa, gems, Rails 20xx ? Sky is the limit

Ruby on OS X • Ruby, just on another unix platform • With some small improvements... e.g. mongrel_rails_persists on OS X Server launchd / bonjour integration • What about Cocoa ?

Family business SmallTalk Objective-C Ruby

A “true” OS X App in Ruby ? Sure. Check out Gitnub

RubyCocoa • A ruby-objc bridge (FUJIMOTO Hisakuni, 2001) • Ruby 1.8 • Green threads, no reentrance • Two runtimes, two GC • ... interesting syntax • Ouch

require 'osx/cocoa'; include OSX app = NSApplication.sharedApplication win = NSWindow.alloc.initWithContentRect_styleMask_backing_defer( [0, 0, 200, 60], NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask, NSBackingStoreBuffered, false) win.title = 'Hello World' button = NSButton.alloc.initWithFrame(NSZeroRect) win.contentView.addSubview(button) button.bezelStyle = NSRoundedBezelStyle button.title = 'Hello!' button.sizeToFit button.frameOrigin = NSMakePoint((win.contentView.frameSize.width/ 2.0)-(button.frameSize.width/2.0), (win.contentView.frameSize.height/ 2.0)-(button.frameSize.height/2.0)) button_controller = Object.new def button_controller.sayHello(sender) puts "Hello OSDC!" end button.target = button_controller button.action = 'sayHello:' win.display win.orderFrontRegardless app.run

Easy. (when you’re proﬁcient in Objective-C, Cocoa, Ruby and the bridge - here be dragons)

MacRuby

MacRuby • One GC to release them all

MacRuby • One GC to release them all • One runtime to bind them

MacRuby • One GC to release them all • One runtime to bind them • In the land of Cocoa where Obj-C lie

MacRuby Laurent Sansonetti (Apple) Vincent Isambart Kich Kilmer Eloy Duran Ben Stiglitz Matt Aimonetti ... http://www.macruby.org http://twitter.com/macruby

Modest goals • The best platform for Ruby developers • A great platform for Cocoa developers

Bridge, what bridge ? $ macirb >> s = "osdc" => "osdc" >> s.class => NSMutableString >> s.class.ancestors => [NSMutableString, NSString, Comparable, NSObject, Kernel] >> s.upcase => "OSDC" >> s.uppercaseString => "OSDC" >> s.respondsToSelector(:upcase) => 1 >> s.respond_to?(:upcase) => true

Bridge, what bridge ? • A Ruby class is an Objective-C class • A Ruby method is an Objective-C method • A Ruby instance is an Objective-C instance

Syntax Objective-C Person *person = [Person new]; [person name]; [person setName:name]; [person setFirstName:first lastName:last]; MacRuby person = Person.new person.name person.name = myName person.setFirstName(first, lastName:last)

HotCocoa require ‘hotcocoa’ include HotCocoa application do win = window :title => ‘hello OSDC’, :frame => [0, 0, 200, 60] b = button :title => ‘Hello!’, :layout => {:align => :center} win << b b.on_action { puts “Hello OSDC!” } end A thin layer by Rich Kilmer, providing a natural ruby experience when coding Cocoa apps

Ruby 1.9 Parser Runtime Built-in classes YARV GC Stdlib

MacRuby Runtime Parser Stdlib LLVM/Roxor libobjc Built-in Classes AOT JIT libauto CoreFoundation

MacRuby 0.4 - 04/09 • XCode integration • Embedding / Runtime Control • HotCocoa • Threaded GC

MacRuby 0.5 - xx/09 • YARV ? LLVM ! • RubySpec • AOT • GrandCentral • ...

Why LLVM ?

Coolest Logo Ever

Everybody loves microbenchmarks (lies, damn lies and benchmarks) From a bench by Patrick Thomson @ C4

C static int fib(int n) { if (n < 3) { return 1; } else { return fib(n - 1) + fib(n - 2); } }

Objective-C @implementation Fib - (int)fib:(int)n { if (n < 3) { return 1; } else { return [self fib:n - 1] + [self fib:n - 2]; } } @end

4 3 execution time (s) 2 1 0 fib(40) C Objective-C

Ruby def fib(n) if n < 3 1 else fib(n-1) + fib(n-2) end end p fib(ARGV.join("").to_i)

4 3 execution time (s) 2 1 0 fib(40) C MacRuby Objective-C

MRI Ruby 1.8 $ ruby fibo.rb 40 102334155 MacRuby $ macruby fibo.rb 40 102334155 MacRuby AOT $ macrubyc fibo.rb -o fibo $ ./fibo 40 102334155

Grand Central # A GCD-based implementation of the sleeping barber problem: # http://en.wikipedia.org/wiki/Sleeping_barber_problem # http://www.madebysofa.com/#blog/the_sleeping_barber waiting_chairs = Dispatch::Queue.new('com.apple.waiting_chairs') semaphore = Dispatch::Semaphore.new(3) index = -1 while true index += 1 success = semaphore.wait(Dispatch::TIME_NOW) if success != 0 puts "Customer turned away #{index}" next end waiting_chairs.dispatch do semaphore.signal puts "Shave and a haircut #{index}" end end

Tools Galore ?

Why MacRuby ? • Ruby for “mac-like” desktop applications • A wonderful experimentation playground • ... Interesting perspectives

Q&A • Ruby 1.9 compatibility • Right now, ≈ 80% on rubyspec • Other platforms, portability • No closed-source dependancies, no deﬁnitive technical blocker • ... Any takers ?

Thanks!

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MacRuby, an introduction

by Olivier Gutknecht on Oct 04, 2009

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