$ perl -MO=Bytecode,-S learning-perl/chap1/helloworld.pl

helloworld.pl

#!/usr/bin/perl
print "Hello World!\n";

helloworld.s

#magic     	0x43424c50
#archname  	darwin-2level
#blversion 	0.09
#ivsize    	8
#ptrsize   	8
#byteorder 	12345678
#longsize  	8
#archflag  	0
#perlversion	5.010001

# <push_begin>

# <end_begin>

# <main_start>

# [leave 1]
newopx 23224	# 23224=size:56,type:181
op_flags 13	# WANT_VOID,KIDS,PARENS
op_next 0
op_targ 1
op_private 64

# [print 2]
newopx 28216	# 28216=size:56,type:220
op_flags 5	# WANT_VOID,KIDS
op_next 1
op_targ 0
op_private 0

# [const 3]
newopx 688	# 688=size:48,type:5

# [PV 4]
newsvx 134235141	# type=5,flags=0x8004405,PV "Hello World!\n"
sv_refcnt 1
newpv "Hello World!\n\000"
xpv
op_flags 2	# WANT_SCALAR
op_next 2
op_targ 0
op_private 0
op_sv 4

# [pushmark 5]
newopx 424	# 424=size:40,type:3
op_flags 2	# WANT_SCALAR
op_next 3
op_targ 0
op_private 0

# [nextstate 6]
newopx 22744	# 22744=size:88,type:177

# [SPECIAL 7]
ldspecsvx 6	# (SV*)pWARN_STD

# [STASH 8]
gv_stashpvx "main"
sv_flags 570425356	# 0x2200000c
# -PV- 9
newpv "main\000"
stpv 9
xhv_name 9
sv_refcnt 2

# [GV 10]
gv_fetchpvx "main::_<learning-perl/chap1/helloworld.pl"
sv_flags 32777	# 0x8009
sv_refcnt 3
xgv_flags 0	# 0x0
gp_refcnt 1

# [PV 11]
newsvx 17413	# type=5,flags=0x4405,PV "learning-perl/chap1/helloworld.pl"
sv_refcnt 1
newpv "learning-perl/chap1/helloworld.pl\000"
xpv
# -GP-
ldsv 10	# *_<learning-perl/chap1/helloworld.pl
gp_sv 11	# PV "learning-perl/chap1/helloworld.pl"
gp_av 0	# B::SPECIAL
gp_hv 0	# B::SPECIAL
gp_cv 0	# B::SPECIAL
gp_io 0
gp_cvgen 0
gp_form 0
# -PV- 12
newpv "\000"
stpv 12
gp_file 12
gp_line 0
op_flags 1	# WANT_VOID
op_next 5
op_targ 0
op_private 0
cop_stash 8
cop_filegv 10
cop_seq 1608
cop_line 2
cop_warnings 7

# [enter 13]
newopx 23080	# 23080=size:40,type:180
op_flags 0	#
op_next 6
op_targ 0
op_private 0
main_start 13

# <main_root>
main_root 1

# <main_cv>

# [CV 14]
newsvx 13	# type=13,flags=0xd,CV undef

# [AV 15]
newsvx 11	# type=11,flags=0xb,AV undef

# [AV 16]
newsvx 1073741835	# type=11,flags=0x4000000b,AV undef
sv_refcnt 1
xmg_stash 0

# [AV 17]
newsvx 1073741835	# type=11,flags=0x4000000b,AV undef

# [SPECIAL 18]
ldspecsvx 1	# &PL_sv_undef

# -AV-
ldsv 17	# AV undef
av_extend 3
av_pushx 18
av_pushx 18
sv_refcnt 1
xmg_stash 0

# -AV-
ldsv 15	# AV undef
av_extend 3
av_pushx 16
av_pushx 17
sv_refcnt 1
xmg_stash 0

# -CV-
ldsv 14	# CV undef
sv_refcnt 1
xmg_stash 0
xcv_stash 0
xcv_start 0
xcv_root 0
xcv_xsubany 0
xcv_padlist 15
xcv_outside 0
xcv_outside_seq 0
xcv_depth 0
xcv_flags 256
xcv_gv 0
main_cv 14

# <curpad>
curpad 17
dowarn

# <DATA>
ret