int getLength(Address addr) {
		lock.acquire();
		try {
			return lengthMgr.getInt(addr);
		}
		catch (NoValueException e) {
			return -1;
		}
		finally {
			lock.release();
		}
	}
Returns the reference manager being used by this code manager.

@return ReferenceManager the reference manager being used by this code manager
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/CodeManager.java