IZ43436: APPLICATIN CRASHES IN DESTRUCTOR WITH -O

April 2010 XL C/C++ Enterprise Edition V8.0 for AIX PTF
June 2011 XL C/C++ Enterprise Edition V8.0 for AIX PTF
July 2009 XL C/C++ Enterprise Edition V8.0 for AIX PTF
October 2009 XL C/C++ Enterprise Edition V8.0 for AIX PTF

APAR status

• Closed as program error.

Error description

• During the testing of an application, an exception occurs within
  a function that is called from within a constructor body in a
  complex constructor, which also involves template code.
  

Local fix

• n/a
  

Problem summary

• Program with the following classes:
  1. Class A has class B as its member
  2. Class B has class C as its member
  3. The dtor of class C has code that accesses its members
  4. Class B throws an exception (requires cleaning up the C
  object)
  
  
  When class B throws an exception, it invokes an
  Invoke_Destructor call in the RTE, passing in the object pointer
  of class C (object to be destroyed).
  The object pointer consists of 2 parts, the "this" pointer (from
  the object that invokes the call) + offset (ex. distance of
  object C from object B). Without inlining, the object pointer
  will be "address of B" + "distance of C from B", yielding the
  correct address to the C object.
  
  With FE inlining On, and class B is inlined into class A, the
  object pointer will be "address of A" + "distance of C from B",
  yielding an incorrect address. A seg fault may occur when dtor
  of C tries to access its members (since the object pointer to C
  is invalid.
  

Problem conclusion

• The offset needs to be updated when class B is inlined into
  class A.
  

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:

  IZ51698 IZ54022 LI75075 LI75078

Fix information

• Fixed component name

  XLC C++ AIX

• Fixed component ID

  5724M1200

Applicable component levels