PH42574: ABEND0C7 in #Calc* routine for LENGTH OF a non-parameter LINKAGE SECTION ODO structure

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• For structures involving ate least one OCCURS DEPENDING ON (ODO)
  clause, the compiler generates a #Calc* routine to determine the
  current LENGTH OF the structure.
  
  If the structure is defined in the LINKAGE SECTION and is NOT a
  parameter, addressability must be established via a
  
  SET ADDRESS OF structure TO some-address
  
  statement, which usually initializes the corresponding Base
  Locator for Linkage (BLL) cell to some-address. The optimizer
  may however incorrectly optimize away the setting of the BLL
  cell, keeping some-address in a register, and leaving the BLL
  cell in an uninitialized or stale state.
  
  If at least one ODO object (an item containing the occurs
  number) is part of the structure, a subsequent LENGTH OF
  structure will then abend in the #Calc* routine or potentially
  return the wrong length due to the incorrect BLL cell.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL 6.2 compiling and  *
  *                 running programs compiled with the OPT(1|2)  *
  *                 option, where the program contains a         *
  *                 statement of the form:                       *
  *                                                              *
  *                 SET ADDRESS OF <data-item-1> to ADDRESS OF   *
  *                 <data-item-2>                                *
  *                                                              *
  *                 and where data-item-1 is a data item in the  *
  *                 linkage section and contains a table defined *
  *                 with the OCCURS DEPENDING ON (ODO) clause.   *
  ****************************************************************
  * PROBLEM DESCRIPTION: S0C4 abend at runtime.                  *
  ****************************************************************
  * RECOMMENDATION: Apply the IBM-provided PTF.                  *
  ****************************************************************
  The compiler optimizer thought it could remove the code for the
  SET statement because it didn't understand that the BLL cell
  that was updated by the SET statement was needed by the code the
  compiler generates to manipulate various pieces of meta
  information for the ODO table.
  

Problem conclusion

• The compiler was updated so that the relationship between the
  SET statement and the ODO table code that references the BLL
  cell
  modified by the SET statement is clear to the optimizer so that
  it doesn't inadvertently remove the SET statement.
  

Temporary fix

Comments

APAR Information

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

  PH41808

• 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 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 UI78471

     UP21/12/15 P F112

• R621 PSY UI78472

     UP21/12/15 P F112

• R622 PSY UI78473

     UP21/12/15 P F112

Fix is available

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