Dipl.-Ing. Thomas Schatzl Address: Altenbergerstr. 69, 4040 Linz, Austria Room: HF 305 Phone: + 43-732-2468-7142 Fax: + 43-732-2468-7138 Email:

Research

• Garbage Collection for High-End Mobile Devices (In cooperation with Oracle Sun Labs, from 2008-)
• For that purpose I am also working on the GCSpy framework and visualizer. You can download a current zipped source tree here.
• Research related interests lie in virtual machines and compilers.
• If there is spare time left, I am contributing to the Free Pascal Object Pascal compiler project, helping with the PowerPC and ARM platforms.

Advisor for bachelor thesises

• Peter Hofer worked on Visualization of Heaps with GCSpy. Thesis PDF available here.
• Scripting for GCSpy Heap visualizer which has been completed by Benjamin Dallinger. Thesis PDF available here.
• Work is in progress for Interactive history graphs for GCSpy.

Other Teaching

• Course: Projektpraktikum SS2011
  Title: Object data structure for Graal Hotspot Compiler
  Description: Zur Zeit erzeugt der Graal Hotspot-Compiler aus einer High-Level Zwischensprache (LIR) direkt Maschinencode. Die Aufgabe dieser Arbeit ist es, zwischen der LIR und dem Maschinencode eine passende objektorientierte Datenstruktur zwischenzuschalten, um darauf vor der eigentlichen Ausgabe des Maschinencodes verschiedene Transformationen (z.B. Optimierungen) anwenden zu koennen.

Proposals for bachelor/master thesises

• Instruction scheduling for client compilers: implement an instruction scheduler for the Maxine VM compiler.
• Memory management prototyper: Create a simulator for rapid prototyping of memory management (garbage collection) algorithms.
• Peephole optimizations for the Maxine compiler: Add and measure the effects of peephole optimizations at code generation level.
• Object graph mutability analysis in Hotspot: Evaluate whether it is true that the object graph surrounding long-living objects usually does not change a lot.
• Back-end work on the FreePascal compiler, e.g. code generation, register allocation, ...

Publications

• Schatzl, T., Daynès, L., Mössenböck, H.: Optimized Memory Management for Class Metadata in a JVM. 9th International Conference on the Principles and Practice of Programming in Java (PPPJ'11), Kongens Lyngby, Denmark, August 24-26, 2011. Preprint/draft version available for personal use here.