iseq.rb

require 'ffi'

module RB
  extend FFI::Library

  ffi_lib [:ruby]

  attach_function :iseq_load, :rb_iseq_load, [:pointer, :int, :pointer], :pointer
  attach_function :iseq_eval, :rb_iseq_eval, [:pointer], :pointer
  attach_function :eval_string, :rb_eval_string, [:string], :pointer
end

a = RB.eval_string('RubyVM::InstructionSequence.new("puts :hi").to_a')
b = 4
c = RB.eval_string('RubyVM::InstructionSequence.compile_option')

p RB.iseq_eval(RB.iseq_load(a, b, c))