PM00655: Rhapsody - Char* as event param prints junk values on console

APAR status

• Closed as Permanent restriction.

Error description

• Summary:
  ---------
  Char* as event param prints junk values on console
  
  Decsription:
  -------------
  
  Using char* as an event param and trying to utilize that else
  where prints junk characters.
  
  Ex: using params->aId and params->aChar in the attached sample
  
  If I make the char* a static string, it prints:
  
  //OUT_PORT(comm)->GEN(evElevOnline(carId,true));
  OUT_PORT(comm)->GEN(evElevOnline('TEST',true));
  
  Refer: Screenshot1
  
  
  If I use a string declared on the stack, it doesn?t:
  
  sprintf(carId,'G%dC%d',grpIdx+1,carIdx+1);
  OUT_PORT(comm)->GEN(evElevOnline(carId,true));
  //OUT_PORT(comm)->GEN(evElevOnline('TEST',true));
  
  Refer: Screenshot2
  
  Should have printed ?receivedG3C5?, but printed ?receivedai:?
  
  
  
  Animation (Sequence Diagrams) displays the correct values, its
  just the console print that is affected.
  
  
  We tested with a CPP program to check the param access flow
  pattern and it prints fine.
  
  It is an issue only iwth char* in Rhapsody.
  
  
  Work Around:
  -------------
  Use sequence diagrams to see the values
  

Local fix

Problem summary

• This is a copy constructor issue.
  When you call
  OUT_PORT(comm)-?GEN(evElevOnline(carId,false,carId,'A'));
  you actually initiate a new evElevOnline event and send to
  it a char pointer.
  Looking in the constructor of evElevOnline, you'll notice a
  simple assignment (aId = p_aId;)
  SO - when you get out of A::fxn(), this memory is being
  released, and must not be used. This is the reason you see
  garbage.
  

Problem conclusion

• A possible solution might be to allocate the memory yourself
  and send it to the constructor:
  use
     char *carId = new char[64];
  instead of:
     char carId[64];
  
  You can add a destructor to the constructor in order to
  release this memory.
  

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:

Fix information

Applicable component levels