DATA FLOW ANALYZER FOR PROGRAM

PROBLEM TO BE SOLVED: To shorten the time needed for analysis of a data flow by extracting the information on definition/reference of a variable. SOLUTION: The functions of a syntax analysis means 26, a procedure decision means 21, a definition/reference information extraction means 23 and a data flow analysis means 24 are stored in a storage medium 31 as programs. These programs can be read and executed by a computer 30. The information on definition/reference of a variable is previously stored in a definition/reference information store file 22 by a prescribed procedure. This procedure includes a compiled and executable program, for example. If the prescribed information is acquired while the information on definition/reference of a variable is extracted for every line of a read source program, the said information is extracted by making reference to the file 22. Such a job is executed for the entire read source program.