Rubinius experiment: generate bytecode for a method call

quux.rb

klass = Object.const_set :Baz, Class.new

method = klass.dynamic_method :main do |generator|
  generator.push_self
  generator.push 42
  generator.allow_private
  generator.send_stack :puts, 1
  generator.ret
end

Baz.new.main

# Error validating bytecode: corrupt instruction sequence
# An exception occurred running quux.rb
#     corrupt instruction sequence - at main+6 (Rubinius::InvalidBytecode)

# Backtrace:
#                  Object#__script__ at quux.rb:11
#   Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:65
#   Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:107
#            Rubinius::Loader#script at kernel/loader.rb:618
#              Rubinius::Loader#main at kernel/loader.rb:772

I found this gist on Google beause I was running into the same problem. I figured out that you can just call generator.send :puts, 1 and that will work. The send method is just shorthand for:

    method = find_literal(:puts)
    generator.send_stack method, 1

Hope that helps!

Hi, E.J.

Thanks for this. You can also call send, a helper method whose existence I wasn't aware of when I wrote this Gist, but which Brian Ford pointed out to me:

    generator.send :puts, 1