Python script that demonstrates loading a Java class file from a string, performing analysis of the class file, and then printing the _init_ function. Finally, this script will print the address and instruction bytes from the basic blocks in the function.

r2_walk_fcn_bbs.py

def flush(c):
    k = c.cons
    k.flush()

def exec_(c, cmd):
    c.cmd0(cmd)
    k = c.cons
    k.flush()

import ctypes
from r2.r_core import RCore
core = RCore()

data = '''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'''

f = core.file_open("malloc://1024", False, 0)
core.cmd0('wx %s'%data)

core.cmd0('ib')
core.cmd0('af')

fcns = core.anal.get_fcns()
fcn = fcns[1]

head = fcn.get_bbs()[0]

bbs = [bb for bb in fcn.get_bbs()]

# print all basic blocks
# addr and bytes
for bb in bbs:
    pBytes = ctypes.cast( bb.op_bytes.__long__(), ctypes.POINTER( ctypes.c_uint8 ) )
    bytes = [pBytes[j] for j in xrange(0, bb.op_sz)]
    print ("0x%04x %s"%(bb.addr, "".join(["%02x"%j for j in bytes]) ))

core.cmd0('pdf')
flush (core)