final int magic = getMagic(sf);
final int magic = getMagic(sf) & VmStackFrame.MAGIC_MASK;
	final boolean isValid(Address sf) {		if (sf == null) {			return false;		}		if (getMethod(sf) == null) {			return false;		}		final int magic = getMagic(sf);		if ((magic != VmStackFrame.MAGIC_COMPILED) && (magic != VmStackFrame.MAGIC_INTERPRETED)) {			return false;		}		return true;	}