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Virtual Machines: Down the Rabbit Hole
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Josep M. Bach (Txus)
June 06, 2013
Technology
2
220
Virtual Machines: Down the Rabbit Hole
Talk given at the Ruby User Group meeting in Berlin.
Josep M. Bach (Txus)
June 06, 2013
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Transcript
Virtual Machines DOWN THE RABBIT HOLE Ruby USER GROUP BERLIN
6. JUNE 2013
TXUSTICE
None
POLITICAL SCIENCE DROPOUT
DON'T TRUST A WORDI SAY
BARCELONA / BERLIN =>
PROCESS VIRTUAL MACHINES
WHY oh why
WHY oh why Portability
WHY oh why Portability PERFORMANCE
WHY oh why PELICAN
wat
SOURCE CODE puts "hello world"
SOURCE CODE puts "hello world" AST send self puts hello
world
SOURCE CODE puts "hello world" AST send self puts hello
world BYTECODE PUSH_SELF PUSH "puts" PUSH "hello world" CALL 1
COMPALER
COMPILER
BUT HOW DOES A VM LOOK LIKE?
HUGE-ASS CASE STATEMENT
STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2 *
3
2 STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2
* 3
3 2 STACK PUSH 2 PUSH 3 ADD PROGRAM IP
2 * 3
5 STACK PUSH 2 PUSH 3 ADD PROGRAM IP 2
* 3
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
<SELF> 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
"puts" <SELF> 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
BABY DUCK
"hello world" "puts" <SELF> 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
42 "hello world" "puts" <SELF> 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
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
IT PRINTED "HELLO WORLD" HEH
EVER SEEN A FUNCTION? def greet(name) puts "Hello, ", name
end
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
<SELF> 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
"puts" <SELF> 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
"Hello, " "puts" <SELF> 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
"John" "Hello, " "puts" <SELF> 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
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
GARBAGE COLLECTION
THE ALLOCATOR
WHAT'S THE OPPOSITE OF AN ALLIGATOR?
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
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
JUST IN TIME
JUST IN TIME COMPILING VM Bytecode MACHINE CODE x86 x86_64
arm
CHECK THIS OUT breaux: even cooler cool IF THIS TOPIC
IS RELEVANT TO YOUR INTERESTS
THANKS! txustice txus QUESTIONS?