Access byte code generated by ruby for sample program

Question

Is there any way to access the byte code created by the Ruby program for the following sample piece of code?

x=1
x.to_s
puts x

Answer 1

This will display the YARV instructions

code = <<END
x=1
x.to_s
puts x
END
puts RubyVM::InstructionSequence.compile(code).disasm

If you want to learn more about that you can look for the book Ruby under a Microscope

This would be the output

1.9.3-p547 :012 > code = <<END
1.9.3-p547 :013"> x=1
1.9.3-p547 :014"> x.to_s
1.9.3-p547 :015"> puts x
1.9.3-p547 :016"> END
 => "x=1\nx.to_s\nputs x\n" 
1.9.3-p547 :017 > puts RubyVM::InstructionSequence.compile(code).disasm
== disasm: <RubyVM::InstructionSequence:<compiled>@<compiled>>==========
local table (size: 2, argc: 0 [opts: 0, rest: -1, post: 0, block: -1] s1)
[ 2] x          
0000 trace            1                                               (   1)
0002 putobject        1
0004 setlocal         x
0006 trace            1                                               (   2)
0008 getlocal         x
0010 send             :to_s, 0, nil, 0, <ic:0>
0016 pop              
0017 trace            1                                               (   3)
0019 putself          
0020 getlocal         x
0022 send             :puts, 1, nil, 8, <ic:1>
0028 leave