Re: Using asm from jruby

Have you seen my BiteScript toolkit? It is a JRuby DSL around ASM.

http://github.com/headius/bitescript

I believe there are a few languages (including Mirah) using it for their JVM backend.

- Charlie (mobile)

On Sep 23, 2011, at 15:32, <[email protected]> wrote:

> I'm a novice asm user, and I've been using jruby for a long time.  When I
> started using asm, it seemed like there might be some things that would be
> simpler in jruby than in Java.
> 
> If you haven't played with asm + jruby, take a look.  You can do some
> interesting things with not much code.    For example, here's the jruby to visit
> a set of class files (given on the command line), printing out every call to
> visit*:
> 
> (You'll need to specify a -I option to tell jruby where to find the asm-3.3.1
> jar - in my case: jruby -I /Users/james/experimements/AsmSample/libs
> SomeFile.class)
> 
> require 'java'
> require 'asm-3.3.1'
> 
> # This lets me type org.objectweb.asm::... instead of
> Java::OrgObjectwebAsm::...
> def org
>  Java::Org
> end
> 
> class SampleVisitor
>  include org.objectweb.asm::MethodVisitor
>  include org.objectweb.asm::ClassVisitor
>  include org.objectweb.asm::FieldVisitor
>  include org.objectweb.asm::AnnotationVisitor
>  include org.objectweb.asm.signature::SignatureVisitor
> 
>  def method_missing name, *args
>    name_string = name.to_s
>    if name_string =~ /visit.*/
>      puts "#{name}\t#{args}"
>      self
>    else
>      super
>    end
>  end
> end
> 
> # Loop through each .class file given on the command line
> ARGV.each do |classfile|
>  puts " ---------------- Reading file #{classfile}"
>  f = java.io.File.new classfile
>  fis = java.io.FileInputStream.new f
> 
>  class_reader = org.objectweb.asm::ClassReader.new fis
> 
>  v = SampleVisitor.new
> 
>  class_reader.accept v, 0
> 
>  puts
> end
> 
> -- 
> James Moore
> [email protected]
> http://blog.restphone.com/
> 
> -- 
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