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README.md

RPySOM - The Simple Object Machine Smalltalk combining Self-Optimizing Interpreters with Meta-Tracing

Introduction

SOM is a minimal Smalltalk dialect used to teach VM construction at the Hasso Plattner Institute. It was originally built at the University of Århus (Denmark) where it was used for teaching and as the foundation for Resilient Smalltalk.

In addition to RPySOM, other implementations exist for Java (SOM, TruffleSOM), C (CSOM), C++ (SOM++), Python (PySOM), and Squeak/Pharo Smalltalk (AweSOM).

A simple Hello World looks like:

Hello = (
  run = (
    'Hello World!' println.
  )
)

This repository contains a RPython-based implementation of SOM, including SOM's standard library and a number of examples. Please see the main project page for links to other VM implementations.

The implementation use either an abstract-syntax-tree or a bytecode-based interpreter. One can chose between them with the SOM_INTERP environment variable.

  • AST-based interpreter: SOM_INTERP=AST
  • bytecode-based interpreter: SOM_INTERP=BC

To checkout the code:

git clone https://github.com/SOM-st/RPySOM.git

RPySOM's tests can be executed with:

$ ./som.sh -cp Smalltalk TestSuite/TestHarness.som

A simple Hello World program is executed with:

$ ./som.sh -cp Smalltalk Examples/Hello/Hello.som

To compile RPySOM, a recent PyPy is recommended and the RPython source code is required. The source distribution of PyPy 7.3 can be used like this:

wget https://downloads.python.org/pypy/pypy2.7-v7.3.1-src.tar.bz2
tar xvf pypy-5.1.1-src.tar.bz2
export PYPY_DIR=`pwd`/pypy-5.1.1-src/

Information on previous authors are included in the AUTHORS file. This code is distributed under the MIT License. Please see the LICENSE file for details.

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RPySOM - The Simple Object Machine Smalltalk implemented in RPython

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