PH68831: METAL C LP64 CAUSES EXTRA LEVEL INDIRECTION FOR PARM LIST

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• With the following testcase, we are able to represent an extra
  level of redirection in the generated Metal C assembler
  instructions with the mixed AMODE calls and DEBUG:
  
  
  ===== TESTCASE:
  
  >cat test.c
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "./test.h"
  
  TRAREA tr_area ;
  
  int main(){
       strcpy(tr_area.prefix,"TAMAU");
       tamrasmt(&tr_area);
       return 0;
  
  }
  >cat test.h
  #pragma linkage(tamrasmt, OS)
  
  struct trarea_t {
  char *__ptr32 text ;
  volatile void *__ptr32 workarea ;
  unsigned short function_code ;
  char ddname[8] ;
  char prefix[9] ;
  char fill[7] ;
  } ;
  
  typedef struct trarea_t TRAREA ;
  
  void tamrasmt( TRAREA * ) __attribute__((amode31)) ;
  >
  ==== COMPILE LINE:
  
  > xlc -S -Wc,"metal, langlvl(extended),
  DEBUG(FORMAT(DWARF),LEVEL(9),NOHOOK,SYMBOL), sscom, NOSE, ilp32,
  
  LIST, SOURCE"
  
  
  *  tamrasmt(&tr_area);
        000012
        LLGTR 14,14
       000012
        NIHF  14,X'00000000'
       000012
        ST    14,216(,13)             #wtemp_17
       000012    -- extra indirection here
        LA    14,216(,13)             #wtemp_17
       000012    -- extra indirection here
        LLGT  15,=V(TAMRASMT)
       000012
        SAM31
       000012
        LA    1,152(,13)              #MX_TEMP1
       000012
        ST    14,152(,13)             #MX_TEMP1
       000012
        MVC   8(4,13),#NAB_1+4
       000012
        BASR  14,15
       000012
        SAM64
       000012
  
  DEBUG option generates extra level of indirection #wtemp17
  section.
  

Local fix

• Remove DEBUG/TEST option or use NODEBUG/NOTEST.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IBM XLC/C++ V2.5 for z/OS           *
  *                 and up with the METAL option and source      *
  *                 code that                                    *
  *                 makes a mixed amode call to a function       *
  *                 marked as                                    *
  *                 #pragma linkage OS with a pointer argument   *
  *                 that requires                                *
  *                 the compiler to convert to a different sized *
  *                 pointer. The compilation also has            *
  *                 DEBUG/TEST options enabled.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: The program may generate code           *
  *                      that passes a wrong argument to the     *
  *                      callee function.                        *
  ****************************************************************
  * RECOMMENDATION: Install the PTF                              *
  ****************************************************************
  N/A
  

Problem conclusion

• Install the PTF
  

Temporary fix

Comments

APAR Information

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

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

Modules/Macros

• CCNECICS CCNECWI  CCNED240 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEIPA3 CCNEIPAO CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY
  CCNMSGE  CCNMSGT  CCNQIPA
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7C0 PSY UO07332

     UP26/04/23 P F604

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.