stackDepth
int stackDepth (FICL_STACK *pStack);
#define DEPTH() stackDepth(pVM->pStack)
int d = stackDepth(pVM->fStack);
i = stackDepth(pVM->fStack);
int d = stackDepth(pStk);
int d = stackDepth(pStk);
i = stackDepth(pVM->pStack);