etc/scripts/disasms/disasm.rb

# Copyright (c) 2021, Compiler Explorer Authors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# POSSIBILITY OF SUCH DAMAGE.

require 'optparse'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: disasm.rb [options]"

  opts.on("-i", "--inputfile FILE", "Use FILE as input") { |v| options[:inputfile] = v }
  opts.on("-o", "--outputfile FILE", "Use FILE as output") { |v| options[:outputfile] = v }
  opts.on("-n", "--fname NAME", "Use NAME as input file name") { |v| options[:fname] = v }
end.parse!

src = File.read(options[:inputfile])
insns = RubyVM::InstructionSequence.compile(src, options[:fname] || options[:inputfile], options[:inputfile], 1)
File.write(options[:outputfile], insns.disassemble)