Disassemble.scala

Disassemble.scala

// to be called from the class output folder as cwd, traverses that folder
// for class files, calls javap on each, and writes the results to text
// files relative to a base directory given as parameter -d <outputDir>
//
// e.g.
// cd scala-2.10.0-M5
// mkdir ~/Desktop/m5
// scala /path/to/Disassemble -d ~/Desktop/m5
// ../scala-2.10.0-M6
// mkdir ~/Desktop/m6
// scala /path/to/Disassemble -d ~/Desktop/m6
// opendiff ~/Desktop/m5 ~/Desktop/m6

import sys.process._
import java.io.File

def recurse( inBase: File, outBase: File )( in: File = inBase, name: String = "" ) {
  val arr = in.listFiles
  if( arr == null ) return
  arr.foreach { inChild =>
    val f     = inChild.getName
    val name1 = if( name == "" ) name else name + "."  
    if( inChild.isDirectory ) {
      recurse( inBase, outBase )( new File( in, f ), name1 + f )
    } else if( inChild.isFile ) {
      if( f.endsWith( ".class" )) {
        val outName = name1 + f.substring( 0, f.length - 6 )
        disassemble( outName, outBase )
      }
    }
  }
}

def disassemble( name: String, outBase: File ) {
  val cmd = Seq( "javap", "-c", name )
  println( cmd.mkString( " " ))
  val code = (cmd #> new File( outBase, name + ".txt" )).!
  if( code != 0 ) println( "... failed with code " + code )
}

args.toSeq match {
  case Seq( "-d", outPath ) =>
    val outDir = new File( outPath )
    require( outDir.isDirectory, outPath + " must be an existing directory" )
    recurse( new File( "" ).getAbsoluteFile, outDir )()
  case _ => println( "Usage: scala Disassemble -d <outputDir>" )
}