execute.rs

execute.rs

fn execute(&mut self, execbyte: u8) -> () {
  if self.push {
    self.push(execbyte);
    self.push=false;
  }else{
    let op: Option<Instruction> = FromPrimitive::from_u8(execbyte);
    match op{
      None => {
        println!("Unknown instruction, skipping...");
      },
      Some(bc) => {
        match bc{
          INTEGER => {
            self.push=true;
          },
          ADD => {
            let a=self.pop() as int;
            let b=self.pop() as int;
            let c=a+b;
            self.push(c as u8);
          },
          SHOWINTEGER => {
            println!("Integer value {}",self.pop() as int);
          },
          SHOWVERSION => {
            println!("PerinVM v0.1.0");
          },
          EXITVM => {
            println!("Exit VM");
          },
          STRING => {
            println!("Unsupported instruction 'STRING' ");
          }
        }
      }
    }
  }
}