/**
* Assembly funcion SWAP. <br>
* Swaps the top of the main stack.
*
* @param rvm Virtual Machine
* @throws StackUnderflowException
* @see Stackable
*/
static void SWAP(RVM rvm) throws StackUnderflowException {
Stackable top = rvm.DATA.pop();
Stackable sl = rvm.DATA.pop();
rvm.DATA.push(top);
rvm.DATA.push(sl);
Debug.printStack(rvm);
}
/**
* Assembly funcion POP. <br>
* Takes out an element of the top of the main stack.
*
* @param rvm Virtual Machine
* @throws StackUnderflowException
* @see Stackable
*/
static Stackable POP(RVM rvm) throws StackUnderflowException {
Stackable pop = rvm.DATA.pop();
Debug.printStack(rvm);
return pop;
}
/**
* Assembly funcion DUP. <br>
* Duplicates the top of the main stack.
*
* @param rvm Virtual Machine
* @throws StackUnderflowException
* @see Stackable
*/
static void DUP(RVM rvm) throws StackUnderflowException {
Stackable st = rvm.DATA.pop();
rvm.DATA.push(st);
rvm.DATA.push(st);
Debug.printStack(rvm);
}
/**
* Assembly funcion PUSH. <br>
* Puts an element in the top of the main stack.
*
* @param rvm Virtual Machine
* @param st Stackable element.
* @throws StackUnderflowException
* @see Stackable
*/
static void PUSH(RVM rvm, Stackable st) {
rvm.DATA.push(st);
Debug.printStack(rvm);
}