grep out push4 opcodes

4bytes.py

import sys
from pyevmasm import disassemble_hex

def four_byte(line):
    toks = line.split()
    if toks[0] != 'PUSH4':
        return
    return toks[1]

def main():
    if len(sys.argv) < 2:
        sys.exit("Usage: <string blob from c'tor>")

    with open(sys.argv[1]) as f:
        blob = f.read()
    opcodes = disassemble_hex(blob).split('\n')
    ops = set()
    for entry in opcodes:
        op = four_byte(entry)
        if not op:
            continue
        ops.add(op)
    print(ops)

main()