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Jun 012010

How to print out Perl opcodes?


If you want to have a deep understanding on how Perl execute your statements, you can try the following:

# perl -MO=Concise -e ' print "foo\n" '

6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
5     <@> print vK ->6
3        <0> pushmark s ->4
4        <$> const[PV "foo\n"] s ->5
-e syntax OK

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