JSVM

Shameless plug: a while back I wrote an assembler-and-VM for a similarly hypothetical assembly language that I was studying in class. Just for kicks, I wondered if I could fit the entire thing into 1KB of JavaScript, whilst including features as step by step execution, a &quot;debugging GUI&quot; (as much as you could expect from 1KB!) featuring the stack, register contents and program counter, plus the assembler on top which performs full syntax&#x2F;opcode argument checking.<p>The result (which I&#x27;m pretty pleased with) is here: <a href="http://chengsun.github.io/ocremutiny.html" rel="nofollow">http:&#x2F;&#x2F;chengsun.github.io&#x2F;ocremutiny.html</a>

I love low-level learning projects like this, but I wish more of them would centralize around something like Nand2Tetris[1] to create an expanded, and interconnected, learning ecosystem.<p>[1] <a href="http://www.nand2tetris.org/" rel="nofollow">http:&#x2F;&#x2F;www.nand2tetris.org&#x2F;</a>

Your VM will work much faster if you take the time to do a second pass over the generated &quot;code&quot; and resolve the jumps to LABELs all at once instead of linearly scanning the code for the appropriate target on each jump.

I had to write one of these (in C) for a class a couple years ago.<p><a href="https://github.com/tylerkahn/MIPS-Virtual-Machine" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;tylerkahn&#x2F;MIPS-Virtual-Machine</a>

If I make make a few suggestions (mostly from a desire to see a more familiar sort of spec):<p>&gt; Add arithmetic shift left&#x2F;right<p>&gt; Add logical shift left&#x2F;right<p>&gt; Add exclusive OR (XOR)<p>&gt; Pick a word size so your integer and bit ops have meaning<p>Questions:<p>&gt; How do I set the program counter from my assembly?<p>&gt; Do I have registers (seems like a stack-based VM, so no)? If not, can I have more stacks?<p>&gt; Can you setup a dedicated block of memory to use as a framebuffer and render it to a &lt;canvas&gt; tag?<p>~<p>Good work so far!

Better name it VM.js !!