My program appears to be losing its ability to perform thru exit. It falls to the next para instead of returning to the location where it was performed from. .
This customer's program presumably has some mainframe heritage, and was coded in such a way as to rely on implementation-specific behaviour that the mainframe gives.
Fortunately we can emulate this behavior using the checker directive PERFORM-TYPE(OSVS).
It specifies the behavior of return jumps from nested PERFORM statements.
PERFORM-TYPE"OSVS" provides compatibility with the mainframe behavior of OS/VS COBOL and DOS/VS COBOL.
The following program demonstrates having an inner PERFORM (paragraph TESTER) fall into a new SECTION instead of returning to the controlling SECTION:
IDENTIFICATION DIVISION. PROGRAM-ID. PROGRAM1. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION. 01 COUNTER PIC 9 VALUE 0. 01 SUB PIC 9. PROCEDURE DIVISION. MAIN SECTION. BEGIN. PERFORM PROCESS DISPLAY "NORMAL TERMINATION" STOP RUN. PROCESS SECTION. DISPLAY "STARTING PROCESS SECTION". PROCESS-LOOP. PERFORM TESTER VARYING SUB FROM 1 BY 1 UNTIL SUB >= 10 GO TO PROCESS-EXIT. TESTER. IF (COUNTER = 6) GO TO PROCESS-EXIT ELSE ADD 1 TO COUNTER END-IF. PROCESS-EXIT. EXIT. FALL-THROUGH SECTION. ALERT. DISPLAY "*** FALL THROUGH CODE ***" STOP RUN. END PROGRAM PROGRAM1. The program falls through when compiled using cob -vug Program1.cbl [support@rhsupv2 100500]$ cobrun Program1 STARTING PROCESS SECTION *** FALL THROUGH CODE *** The program succeeds when compiled using cob -vug demo.cbl -C'PERFORM-TYPE(OSVS)' [support@rhsupv2 100500]$ cobrun Program1 STARTING PROCESS SECTION NORMAL TERMINATION