gistfile1.txt

c:\Users\user\repos\ruby\mybuild>ruby --disable-gems --dump aaa
ruby: warning: don't know how to dump `aaa',
ruby: warning: but only [version, copyright, usage, yydebug, syntax, parsetree,
parsetree_with_comment, insns].
^Z

c:\Users\user\repos\ruby\mybuild>ruby --disable-gems --dump insns
p :foo
^Z
== disasm: <RubyVM::InstructionSequence:<main>@->=======================
0000 trace            1                                               (   1)
0002 putself
0003 putobject        :foo
0005 opt_send_simple  <callinfo!mid:p, argc:1, FCALL|ARGS_SKIP>
0007 leave

nmake parse
というのもある。