PH38137: Single stepping problem with Xpediter debugger because the compiler splits a statement at OPT(0) when using NUMCHECK

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Third party debuggers like Xpediter depend on OPT(0) compiles
  not rearranging code. The use of NUMCHECK is causing a MOVE
  statement to be split into two parts, one under the MOVE
  statement number, and the rest under a later statement, even at
  OPT(0).
  

Local fix

• Compile with NONUMCHECK
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IBM Enterprise COBOL 6.2 compiling  *
  *                 programs with NUMCHECK and OPT(0).           *
  ****************************************************************
  * PROBLEM DESCRIPTION: The compiler may generate instructions  *
  *                      that have a line number that is out of  *
  *                      order with the line numbers of          *
  *                      surrounding instructions.               *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF,                      *
  ****************************************************************
  The compiler's internal representation of a program makes
  frequent reference to the base address of WORKING-STORAGE, which
  is permanently in register R9. The compiler initially generates
  NUMCHECK checks for all affected senders and then runs analysis
  to remove checks of known good data, known bad data, or of
  values  that have already been checked. Removing such checks
  caused the compiler to keep references to the base address of
  WORKING-STORAGE and generate an instruction for the first time
  any such reference was found. As references to the base address
  of WORKING-STORAGE could be spread throughout the program, this
  unneeded instruction would have the line number of the first
  reference to the base address of WORKING-STORAGE but might be
  generated much later in the program, making the instruction out
  of order.
  

Problem conclusion

• The compiler was fixed to avoid generating the unnecessary
  instruction. "202106_62_work_sheet.txt" 503 lines, 24422
  characters
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PH36213

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• IGY8RWTU IGYCASMB IGYCCBE  IGYCCCRT IGYCCICS IGYCCSRV IGYCDGEN
  IGYCDIAG IGYCDMAP IGYCEN$0 IGYCEN$1 IGYCEN$2 IGYCEN$3 IGYCEN$4
  IGYCEN$5 IGYCEN$8 IGYCEN$D IGYCEN$R IGYCFGEN IGYCFREE IGYCINIT
  IGYCJA$0 IGYCJA$1 IGYCJA$2 IGYCJA$3 IGYCJA$4 IGYCJA$5 IGYCJA$8
  IGYCJA$D IGYCJA$R IGYCLIBH IGYCLIBO IGYCLIBR IGYCLSTR IGYCLVL0
  IGYCLVL1 IGYCLVL2 IGYCLVL3 IGYCLVL8 IGYCMALL IGYCOPT  IGYCOSCN
  IGYCPGEN IGYCRCTL IGYCRDPR IGYCRDSC IGYCREAL IGYCRWT  IGYCSCAN
  IGYCSIMD IGYCUE$0 IGYCUE$1 IGYCUE$2 IGYCUE$3 IGYCUE$4 IGYCUE$5
  IGYCUE$8 IGYCUE$D IGYCUE$R IGYCXREF IGYDRV   IGYEQCWI IGYMSGE
  IGYMSGK  IGYMSGT  IGYQCBE  IGYZQDRV IGYZQENU IGYZQJPN
  

Fix information

• Fixed component name

  ENT COBOL FOR Z

• Fixed component ID

  5655EC600

Applicable component levels

• R620 PSY UI75921

     UP21/06/24 P F106

• R621 PSY UI75922

     UP21/06/24 P F106

• R622 PSY UI75923

     UP21/06/24 P F106

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.