An application of compiler technology to the year 2000 problem

This paper describes our experience in developing techniques for repairing date affected programs using standard compiler technology. Starting with da te-ness information of certain variables based on their declarations, we pr opagate this information through all possible control paths, using date inf erence rules to traverse across individual statements, Our approach is fine grained enough to infer the date-ness of each occurrence of a variable. Af ter detecting date-ness of variables, we renovate programs by applying a tr ansformation using base year strategy, These techniques have been implement ed as a tool set for renovating date affected COBOL programs. Copyright (C) 1999 John Whey & Sons, Ltd.