Decompiled java AST representation

[Vladimir Maximovich]

Hello,

So I've been playing a little with JEB plugins and scripts. I saw there is a script for decompiling all the bytecode and creating corresponding JAVA files.

I was wondering, by the use of Java plugins or Python scripts - is there any way to take this decompiled Java files and work with their AST elements?

I mean, when the input is a java file, I want to work with the AST elements themselves, either to manipulate them or simply just to "break the Java" to it's smallest components. 

I want to get a full tree of the class where I know all the methods, variables, names, types, ... - and be able to save the representation or change names with code (both plugins and scripts are acceptable here).

Thank you)))

[Nicolas Falliere]

Yes of course, e.g. for a class:

// if you already have a decompiled code unit, IJavaSourceUnit, such as produced when decompiling using decompile()

// src is an IJavaSourceUnit

IJavaClass c = src.getClassElement()

// if you're going though a decompiler object directly:

// dexdec is a IDexDecompilerUnit object

//  IJavaMethod is a top-level AST element

IJavaMethod m = dexdec.getMethod("Lcom/foo;f()V")

//  IJavaClass is another top-level AST element  

IJavaClass c = dexdec.getClass() "Lcom/foo;")

Have a look at this dummy script, it's taking an AST element and printing the tree recursively using getSubElements()

https://github.com/pnfsoftware/jeb2-samplecode/blob/master/scripts/JavaASTDemo.py  

Reference point: https://www.pnfsoftware.com/jeb/apidoc/reference/com/pnfsoftware/jeb/core/units/code/android/IDexDecompilerUnit.html and all classes in the package com.pnfsoftware.jeb.core.units.code.android.

Hope this helps - let me know if you have more questions. And you should join us on Slack (see link in my sig below), for a more interactive conversation!

--

Nicolas Falliere (ni...@pnfsoftware.com)
JEB Decompiler, Founder and Architect

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