README

fizzvm

This is a simple stack virtual machine I made after reading a few articles and getting ideas on the subject, my goal is to try and make my own programming language with a compiler and bytecode interpreter a little like Java that can run my little programs on different platforms.

I have so far done a basic VM that runs some small programs, I soon I hope to write a simple compiler that I can translate my own high-level language to the assembly code then the assembler will compile to bytecode that can executed on my own virtual machine.

With the current version the project loads a plain text file from the command prompt with an assembly like language then builds a byte array of integers then executes the instructions. My idea is to in future versions separate the assembler compiler and the VM interpreter.

At this moment I am just really testing so bear with me. There is really no documentation yet, I plan to add this with future updates; however, I have left some examples to get you started and get an idea. If you really get stuck, you can contact me or view the source code.

Compile and running

For this you need Free Pascal or Lazarus, it should be easy to also work it in Delphi as well.

Example

Times table lister.

# Display a times table by the number entered from the user.

.globals [0] count
.globals [1] counter
.globals [2] table

iconst 12
istore count
iconst_1
istore counter

# Load chars
iconst_0
iconst ':'
iconst 'r'
iconst 'e'
iconst 'b'
iconst 'm'
iconst 'u'
iconst 'n'

#Print the chars on the stack until 0 is found
print:
 #Print char to screen
 syscall 3
jnz print

#Get number from input
SysCall 4

#The times table to list
istore table

#Display the times table
loop:
 iload counter
 iload table
 mul
 syscall 2
 iload counter
 inc
 istore counter
 
 iload counter
 iload count
 leq
 jt loop
halt