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Torsten Ruger
2015-11-23 14:19:56 +02:00
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---
<div class="row vspace10">
<div class="span12">
<h2 class="center">A completely object oriented virtual machine</h2>
<h2 class="center">A completely object oriented machine</h2>
<div>
<p class="center"><span>
Leaving the old (c) world behind to go where no machine has gone before (or something like that)
A fully self describing object system without external dependencies capable of executing dynamic
object oriented languages like ruby or python.
</span></p>
</div>
</div>
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<div class="row vspace20">
<div class="span4">
<h2 class="center">Architecture</h2>
<p>
Salama is maybe the first successful attempt at writing a virtual machine without the use
of c or c tools.
It defines and implements an object virtual machine completely in object oriented terms,
using ruby to bootstrap itself.
<h2 class="center">Goal</h2>
<p>
The goal is to execute object oriented code without external dependencies, on modern hardware.
</p>
<p>
Just some of the features, most of which would not be possible in c:
<ul>
<li> Linked-List, not stack, based </li>
<li> Multiple return addresses based on type </li>
<li> Multiple implementations per function based on type </li>
<li> Implicit type tracking using adaptive code</li>
<li> Explicit <a href="/2015/06/20/the-static-call-chain.html">message and frame objects</a></li>
<li> <a href="http://book.salama-vm.org/register/machine.html">Register machine abstraction</a></li>
<li> <a href="http://book.salama-vm.org/object/instructions.html">Extensible</a> instruction set</li>
</ul>
Salama defines is's own machine language (soml) to bridge the gap between the higher language
(ruby) and assembler. Both soml and assembler can be seens as layers towards the final
binary executables</li>
<p>
No external dependencies means a system that defines an object oriented system language
that compiles to assembler. A sort of object version of c, but without using c.
</p>
<p>
It must be possible to compile higher level, dynamic, object oriented languages into this
language, in a similar way that c++ is compiled into c (at least used to be). So ruby compiles
to soml which compiles to assembler which compiles to binaries. <b>No interpretation.</b>
</p>
<p>
Most of the system is defined in a higher level language (ruby) and only a small runtime,
mostly for operating system acccess, needs to be written in the system language.
</p>
</div>
<div class="span4">
<h2 class="center">Status</h2>
<p>
A first version of the system language is now <a href="/soml/soml.html">done.</a>.
The staticaly typed language is called SOML (salama object machine language), has a roughly
ruby-ish syntax while c-ish semantics, and introduces several new concept:
<ul>
<li> Object based memory (no global memory) </li>
<li> Multiple return addresses based on type </li>
<li> Multiple implementations per function based on type </li>
<li> Implicit type tracking using adaptive code</li>
<li> Explicit <a href="/2015/06/20/the-static-call-chain.html">message and frame objects</a></li>
<li> <a href="http://book.salama-vm.org/register/machine.html">Register machine abstraction</a></li>
<li> <a href="http://book.salama-vm.org/object/instructions.html">Extensible</a> instruction set</li>
</ul>
</p>
<p>
While the project is just getting on two years, it is starting to settle conceptually,
progress smoothly, and produce <b>working binaries</b>.
An abstract risc like register level defines some abstraction from the actual hardware. The
compiler compiles to this level, but a mapping to Arm is provided to produce <b>working binaries</b>.
</p>
<p>
In numbers, there are over <b>1000 commits</b>, 6 sub-projects, more than 10k lines of code
and well over 600 tests.
</p>
<p>
Maybe more importantly there is <a href"/book.html">good documentation</a> along with an
evolved idea of how most of the difficult issues are solved. So while the executables are
still of the "Hello world" quality, there are no coneptual problems anymore.
</p>
<p>
<p>
There is also an interpreter (mostly for testing) and a basic
<a href="https://github.com/salama/salama-debugger"> visual debugger</a> which not only helps
debugging, but also understanding of the machine.
</p>
</div>
<div class="span4">
<h2 class="center">Docs</h2>
<p>
The short introduction is under the <a href="/salama/layers.html">architecture</a> menu.
</p>
<p>
The section on SOML gives an overview of the <a href="/soml/soml.html">system language</a>.
</p>
<p>
The full documentation is in form of a gitbook and can be <a href="/book.html">viewed</a> ,
and <a href="https://github.com/salama/object-machine">edited</a>
The full documentation is in form of a gitbook and can be <a href="/book.html">viewed here.</a>
</p>
<p>
The <a href="/project/motivation.html">about</a> section has some info of when and how this