sample.rb

#!/usr/local/bin/ruby
require 'open3'
require 'tempfile'
require 'rbconfig'
require 'fiddle/import'

class Sample
  def main
    func = RbConfig::CONFIG["SYMBOL_PREFIX"]+"sample_add"
    src = <<EOS
	.text
	.globl	#{func}
	.align	16, 0x90
#{func}:
	addl	%esi, %edi
	movl	%edi, %eax
	ret
EOS
    objfile = Tempfile.new ['rbasm-obj_', '.o'], '/tmp'
    objfile.close
    IO.popen(%W"clang -x assembler -c -o #{objfile.path} -", "w", umask: 0177) do |stream|
      stream.write src
      stream.close
    end
    libfile = Tempfile.new ['rbasm-lib_', '.so'], '/tmp'
    libfile.close
    system(*%W"clang -shared -o #{libfile.path} #{objfile.path}", umask: 177)
    objfile.delete
    m = Module.new {
      extend Fiddle::Importer
      dlload libfile.path
      libfile.delete
      extern "int sample_add(int, int)"
    }
    p m.sample_add 1, 2
    m.handler.handlers.each {|h|
      h.close
    }
    m = nil
    GC.start
  end
end

sample = Sample.new
sample.main