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→Tools: Game script (bytecode) decompiler
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Write a ''generic'' bytecode decompiler with the goal of ultimately being able to decompile bytecode of all games which use a stack based bytecode virtual machine. You can look at existing work from GSoC 2007, our descumm compiler (only SCUMM v6 and newer is stack based) and some other de*.cpp files in our [http://scummvm.svn.sourceforge.net/viewvc/scummvm/tools/trunk/ tools SVN module]. Your goal should be to support at least two different bytecode systems (i.e., from two different ScummVM engines). But everything should be designed and implemented with the ultimate goal of being able to support all such bytecode systems (e.g. by providing a suitable API or subclassing facilities that make it possible to hook in parsers for arbitrary bytecode variants). Engines which use a stack based virtual machine include SCUMM v6+, KYRA, SWORD1, SWORD2, ... For many of these, free game demos are available, too. We would help you by providing dumps of scripts etc. | Write a ''generic'' bytecode decompiler with the goal of ultimately being able to decompile bytecode of all games which use a stack based bytecode virtual machine. You can look at existing work from GSoC 2007, our descumm compiler (only SCUMM v6 and newer is stack based) and some other de*.cpp files in our [http://scummvm.svn.sourceforge.net/viewvc/scummvm/tools/trunk/ tools SVN module]. Your goal should be to support at least two different bytecode systems (i.e., from two different ScummVM engines). But everything should be designed and implemented with the ultimate goal of being able to support all such bytecode systems (e.g. by providing a suitable API or subclassing facilities that make it possible to hook in parsers for arbitrary bytecode variants). Engines which use a stack based virtual machine include SCUMM v6+, KYRA, SWORD1, SWORD2, ... For many of these, free game demos are available, too. We would help you by providing dumps of scripts etc. | ||
A good starting point for this might be the [[http://jode.sf.net Jode]] Java bytecode decompiler which does a pretty good job at decompiling. Another useful site might be [http://www.program-transformation.org/Transform/DeCompilation]. The technical contact has several ideas on how to approach this project, too -- as usual, you are expected to talk to us and ask for help and ideas! | A good starting point for this might be the [[http://jode.sf.net Jode]] Java bytecode decompiler which does a pretty good job at decompiling. Another useful site might be [http://www.program-transformation.org/Transform/DeCompilation], and [http://vanemmerikfamily.com/mike/master.pdf this thesis]. The technical contact has several ideas on how to approach this project, too -- as usual, you are expected to talk to us and ask for help and ideas! | ||
The tool should run on at least Windows, Mac OS X and Linux. Acceptable languages include C/C++, Python, Perl -- other languages might be OK, but please consult with us first -- after all, other developers also will have to use and maintain your code. For the same reason is is obviously mandatory that your code be well documented. | The tool should run on at least Windows, Mac OS X and Linux. Acceptable languages include C/C++, Python, Perl -- other languages might be OK, but please consult with us first -- after all, other developers also will have to use and maintain your code. For the same reason is is obviously mandatory that your code be well documented. | ||