🚀 go-pugleaf

In g++ 2.2.2 and the current snapshot 920814, the following two code
fragement show two possible locations for NULL derferences in cc1plus.
The diff is from the snapshot and it doesn't attempt to solve the
problem NULL pointer problem, but instead it tries to avoid a core
dump.  I'll try to get a small C++ example that causes the above
failures.


*** 1.9	1992/08/11 16:18:26
--- cp-class.c	1992/08/18 20:12:18
***************
*** 928,936 ****
  	  tree context_binfo = binfo_value (base_context, base, 0);
  	  prepare_fresh_vtable (vbases, context_binfo, t);
  	}
!       modify_vtable_entry (get_vtable_entry (BINFO_VIRTUALS (vbases), base_fndecl),
! 			   build_vtable_entry (this_offset, pfn),
! 			   fndecl, base_context);
      skip: {}
      }
  }
--- 928,942 ----
  	  tree context_binfo = binfo_value (base_context, base, 0);
  	  prepare_fresh_vtable (vbases, context_binfo, t);
  	}
!       if (! BINFO_VIRTUALS (vbases))
!       {
! 	 modify_vtable_entry (get_vtable_entry (BINFO_VIRTUALS (vbases), base_fndecl),
! 			      build_vtable_entry (this_offset, pfn),
! 			      fndecl, base_context);
!       }
!       else
! 	 fprintf(stderr, "Warning BINFO_VIRTUALS (vbases) == NULL\n");
! 
      skip: {}
      }
  }
*** 1.8	1992/08/11 16:18:26
--- cp-typeck.c	1992/08/18 20:11:56
***************
*** 1575,1580 ****
--- 1575,1587 ----
      }
  
    itype = TREE_TYPE (index);
+ 
+   if (!itype)
+   {
+      error("itype is equal to NULL");
+      return error_mark_node;
+   }
+   
    if (TREE_CODE (itype) == REFERENCE_TYPE)
      {
        index = convert_from_reference (index);


Jody Winston		jody@shell.com
..!{sun,psuvax1,bcm,rice,decwrl,cs.utexas.edu}!shell!jody
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