11–17 of 17 posts
Your VM will work much faster if you take the time to do a second pass over the generated "code" and resolve the jumps to LABELs all at once instead of linearly scanning the code for the appropriate target on each jump.
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 ded…
> 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 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,
Better name it VM.js !!
I real disappointed when I discovered this was not an amateur JS vm that I could read in a weekend or two, that would be awesome to have :(
Better name it VM.js !!
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 ded…
> 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 (s…
Earlier quoted context omitted.
> 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 (s…
I think I understand the thing about word size, thank you I'll fix it
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).
Earlier quoted context omitted.
I think I understand the thing about word size, thank you I'll fix it
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).