5 ms·

If I make make a few suggestions (mostly from a desire to see a more familiar sort of spec): > Add arithmetic shift left/right > Add logical shift left/right

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

jawb 13y ago
> Add arithmetic shift left/right .. I'll add > Add logical shift left/right .. I'll add > Add exclusive OR (XOR) .. I'll add > Pick a word size so your integer and bit ops have meaning .. I think I'll just rely on js types to keep things simple, If you see any reason not to please explain further > How do I set the program counter from my assembly? The only way to set PC is through branching > Do I have registers (seems like a stack-based VM, so no)? If not, can I have more stacks? Like you said it's a stack-based VM, so no registers. Currently it's a single stack since it's enough. I never encountered a machine with multiple stacks, can you enlighten me about this ? > Can you setup a dedicated block of memory to use as a framebuffer and render it to a <canvas> tag I made this machine to be used by students to test compilers, But I think I'll add this feature in case there is any ambitious student who wants to embed a graphics library in his language :) Thanks,
- jawb 13y ago
  I think I understand the thing about word size, thank you I'll fix it
  - angersock 13y ago
    No worries--nothing broken, just undefined. :) Having a fixed word size in a machine is important for being able to say, for example, what the largest and smallest integers are (assuming twos-complement arithmetic).
    - jawb 13y ago
      It's 32bit now

jawb 13y ago

> Add arithmetic shift left/right .. I'll add > Add logical shift left/right .. I'll add > Add exclusive OR (XOR) .. I'll add > Pick a word size so your integer and bit ops have meaning .. I think I'll just rely on js types to keep things simple, If you see any reason not to please explain further > How do I set the program counter from my assembly? The only way to set PC is through branching > Do I have registers (seems like a stack-based VM, so no)? If not, can I have more stacks? Like you said it's a stack-based VM, so no registers. Currently it's a single stack since it's enough. I never encountered a machine with multiple stacks, can you enlighten me about this ? > Can you setup a dedicated block of memory to use as a framebuffer and render it to a <canvas> tag I made this machine to be used by students to test compilers, But I think I'll add this feature in case there is any ambitious student who wants to embed a graphics library in his language :) Thanks,

jawb 13y ago
I think I understand the thing about word size, thank you I'll fix it
- angersock 13y ago
  No worries--nothing broken, just undefined. :) Having a fixed word size in a machine is important for being able to say, for example, what the largest and smallest integers are (assuming twos-complement arithmetic).
  - jawb 13y ago
    It's 32bit now