public Exchange(RegVRef source, RegVRef dest, PointerIndex frame, SExpr addr)
{
if (addr.AsDirectField() == null && !addr.IsConstant())
{
throw new ArgumentException("must be register field or constant", "addr");
}
this.source = source;
this.dest = dest;
this.frame = frame;
this.addr = addr;
}
public Exchange(RegVRef reg, PointerIndex frame, SExpr addr) : this(reg, reg, frame, addr)
{
}
public Push(RegVRef reg, PointerIndex stack = PointerIndex.CallStack)
{
this.reg = reg;
this.stack = stack;
}
public Exchange(RegVRef reg, PointerIndex frame = PointerIndex.CallStack) : this(reg, frame, IntSExpr.Zero)
{
}
public static FieldSRef Pointer(PointerIndex ptr)
{
string[] ptrnames = { "err", "callstack", "progbase", "progdata", "localdata" };
return(new FieldSRef(RegVRef.rIndex, ptrnames[(int)ptr]));
}
