public CodeUnit getPreviousCodeUnit() {
		if (program == null)
			return null;
		return program.getListing().getCodeUnitBefore(address);
	}
{@return the code unit before this code unit.}

@throws ConcurrentModificationException if this object is no longer valid.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/util/PseudoCodeUnit.java