Factor/GSoC/2009/Port Factor to ARM
Factor used to run on ARM, but the port is now unmaintained. Parts of the existing code should be easy to salvage. This includes the ARM support in the VM, and the ARM assembler in Factor. The ARM compiler backend will need to be rewritten because the compiler's architecture has been changed since then.
This project will involve four tasks. The first three are highly technical and have pretty equal difficulty. The last one is more holistic and open-ended.
Porting the VM
The VM needs to have support for the ARM architecture. There are several things to do here:
Porting the non-optimizing compiler
The Non-optimizing compiler has a backend for each CPU which defines sub-primitives in assembly. These are static assembly snippets which are concatenated together. The existing backends in
Porting the optimizing compiler
The first two tasks are mandatory in order to get Factor to do anything useful on the ARM. This task is optional, but it is an important part of making Factor usable on ARM. The Optimizing compiler has a backend for each CPU which defines code generator templates for abstract instructions. These are more fine-grained than the non-optimizing compiler's sub-primitives. The code is in
Optimizing space usage and performance
Since embedded systems have less memory and CPU resources than desktops or servers, performance is critical. Part of the project would involve identifying parts of Factor which are responsible for the biggest space and time overheads and improving the algorithms and implementation of the code to minimize this.
The project will be deemed to be complete when all core unit tests pass (running
Benefit to the student
The student will gain experience in porting a real-world compiler to a new CPU architecture.
Benefit to the community
Factor will be usable for a wider range of projects if it can run on embedded ARM systems.
This revision created on Fri, 13 Mar 2009 04:14:09 by slava
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