From: ts <decoux@...>
Date: 2008-04-23T17:37:46+09:00
Subject: Re: Performance on method dispatch for methods defined via define_method

Robert Dober wrote:
> However, if and only if, the block in the define_method does not use
> the closure we could really inline the block as the code of a method
> defined with def.

 What do you want to say with "inline" ?

vgs% ./ruby -e 'puts VM::InstructionSequence.compile("proc {|x| x = 12 }.call(1)").disasm'
== disasm: <ISeq:<compiled>@<compiled>>=================================
== catch table
| catch type: break  st: 0000 ed: 0007 sp: 0000 cont: 0007
|------------------------------------------------------------------------
0000 putnil                                                           (   1)
0001 send             :proc, 0, block in <compiled>, 8, <ic>
0007 putobject        1
0009 send             :call, 1, nil, 0, <ic>
0015 leave            
== disasm: <ISeq:block in <compiled>@<compiled>>========================
== catch table
| catch type: redo   st: 0000 ed: 0006 sp: 0000 cont: 0000
| catch type: next   st: 0000 ed: 0006 sp: 0000 cont: 0006
|------------------------------------------------------------------------
local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1] s3)
[ 1] x<Arg>     
0000 putobject        12                                              (   1)
0002 dup              
0003 setdynamic       x, 0
0006 leave            
vgs%


vgs% ./ruby -e 'puts VM::InstructionSequence.compile("def a(x) x = 12; end; a(1)").disasm'
== disasm: <ISeq:<compiled>@<compiled>>=================================
0000 putnil                                                           (   1)
0001 definemethod     :a, a, 0
0005 putnil           
0006 putobject        1
0008 send             :a, 1, nil, 8, <ic>
0014 leave            
== disasm: <ISeq:a@<compiled>>==========================================
local table (size: 2, argc: 1 [opts: 0, rest: -1, post: 0, block: -1] s1)
[ 2] x<Arg>     
0000 putobject        12                                              (   1)
0002 dup              
0003 setlocal         x
0005 leave            
vgs% 



Guy Decoux