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Virtual Machines DOWN THE RABBIT HOLE Ruby USER GROUP BERLIN 6. JUNE 2013

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TXUSTICE

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No content

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POLITICAL SCIENCE DROPOUT

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DON'T TRUST A WORDI SAY

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BARCELONA / BERLIN =>

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PROCESS VIRTUAL MACHINES

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WHY oh why

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WHY oh why Portability

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WHY oh why Portability PERFORMANCE

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WHY oh why PELICAN

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wat

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SOURCE CODE puts "hello world"

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SOURCE CODE puts "hello world" AST send self puts hello world

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SOURCE CODE puts "hello world" AST send self puts hello world BYTECODE PUSH_SELF PUSH "puts" PUSH "hello world" CALL 1

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COMPALER

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COMPILER

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BUT HOW DOES A VM LOOK LIKE?

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HUGE-ASS CASE STATEMENT

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STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2 * 3

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2 STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2 * 3

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3 2 STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2 * 3

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5 STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2 * 3

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STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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"puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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BABY DUCK

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"hello world" "puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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42 "hello world" "puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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nil STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LIT 2 CALL 2 PROGRAM IP puts "hello world", 42 "puts" "hello world" 42 LITERALS

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IT PRINTED "HELLO WORLD" HEH

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EVER SEEN A FUNCTION? def greet(name) puts "Hello, ", name end

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STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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"puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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"Hello, " "puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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"John" "Hello, " "puts" STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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nil STACK PUSH_SELF PUSH_LIT 0 PUSH_LIT 1 PUSH_LOCAL 0 CALL 2 PROGRAM IP def greet(name) puts "Hello, ", name end "puts" "Hello, " LITERALS name: "John" LOCALS

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GARBAGE COLLECTION

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THE ALLOCATOR

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WHAT'S THE OPPOSITE OF AN ALLIGATOR?

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REFERENCE COUNTING object.refcount++ WHEN WE PUSH AN OBJECT TO THE STACK object.refcount-- WHEN WE POP AN OBJECT FROM THE STACK BROUGHT TO YOU BY NAIVETY

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COOLER ALGORITHMS GENERATIONAL BAKER'S TREADMILL BROUGHT TO YOU BY COMPUTER SCIENCE MASTERMINDS REAL-TIME INCREMENTAL NON-MOVING NON-COPYING MOVING COPYING CONCURRENT BITMAP MARKING TRICOLOR STOP-THE-WORLD MARK & SWEEP BACON-FLAVOURED SENTIMENTAL KEBAP

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JUST IN TIME

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JUST IN TIME COMPILING VM Bytecode MACHINE CODE x86 x86_64 arm

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CHECK THIS OUT breaux: even cooler cool IF THIS TOPIC IS RELEVANT TO YOUR INTERESTS

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THANKS! txustice txus QUESTIONS?