krispybyte / virtual-machine

A virtual machine with an included lexer

📜 virtual-machine

A virtual machine I've been working on over the weekend, includes a lexer and a bytecode generator so that you can write code in a file which is then compiled into the VM's bytecode and ran. Code could most likely be improved in some places, meaning pull requests are welcome as always.

🤯 Features

• Artihmetic instructions (addition, subtraction, multiplication, division)
• Stack value pushing/popping
• Several registers
• Large numeric value support
• Debug mode (more specified in the flags section)
• Interpreter supports running in both x64 and x86
• Code comments

💡 Todo

• Add floating point value support
• Add strings, chars and printing

🏁 Flags

• '-b' - Build flag, compiles the content in your inputted file and saves it to a file
• '-d' - Debug flag, skips code compilation and instead just converts it to bytecode then runs it through the VM
• '-o' - Out flag, lets you specify the binary's file name after the flag is pass

Usage examples

Compiling code (-o flag is optional)

$ virtual-machine code.txt -b -o output.bin

Running code without compilation

$ virtual-machine code.txt -d

⚙️ Example code

$ this is an example of a comment

add vax, 2
mul vax, 4
div vax, 2

mov vax, 0      $ this is another comment

push 9000
push 2000

pop vax
pop vbx

$ do not trust this comment.
$ https://www.youtube.com/watch?v=dQw4w9WgXcQ

Example output

..
vax = 2
vax = 8
vax = 4
vax = 0
popped 2000 onto vax
popped 9000 onto vbx