function_selector.etk

# entry point check

returndatasize
calldataload
returndatasize
byte                                            # 1st byte of calldata

dup1
push1 0x18
eq
%push(totalSupply)
jumpi

dup1
push1 0x70
eq
%push(balanceOf)
jumpi

dup1
push1 0xa9
eq
%push(transfer)
jumpi

dup1
push1 0x23
eq
%push(transferFrom)
jumpi

dup1
push1 0x09
eq
%push(approve)
jumpi

push1 0xdd
eq
%push(allowance)
jumpi