CHANGED MACRO EXPANDING AND CORRECTING SYSTEM

PURPOSE:To improve the reliability of a machine language train by replacing only macro expansion form embedded in the machine language train corresponding to a source program with a change macro expansion form which is changed already, based on macro reference information extracted and saved by an extracting means and generating a changed machine language train, when defined contents of the macro are changed. CONSTITUTION:When defined contents of the macro MACRO are changed, a replacing means 300 replaces only a macro expansion form M embedded in a machine language train C corresponding to a source program P to a change macro expansion form M' which is changed already, based on macro reference information extracted and saved by an extracting means 200, and generates a change machine language train C'. Accordingly, when the macro MACRO is changed, only the macro expansion form M embedded in the machine language train corresponding to all the source programs which refer to the macro to be changed is replaced with the change macro expansion form M'. In such a way, the time for converting the source program again is curtailed, and the replacement omission does not occur either, and the reliability of the machine language train is improved.