Re: c++/1210: Printing fails/aborts for some attributes (Cannot access memory at address)

[Daniel Jacobowitz <drow at mvista dot com>]

The following reply was made to PR c++/1210; it has been noted by GNATS.

From: Daniel Jacobowitz <drow@mvista.com>
To: milan.schulte@offis.de
Cc: gdb-gnats@sources.redhat.com
Subject: Re: c++/1210: Printing fails/aborts for some attributes (Cannot access memory at address)
Date: Wed, 14 May 2003 10:50:50 -0400

 On Wed, May 14, 2003 at 02:12:44PM -0000, milan.schulte@offis.de wrote:
 > 
 > >Number:         1210
 > >Category:       c++
 > >Synopsis:       Printing fails/aborts for some attributes (Cannot access memory at address)
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Wed May 14 14:18:00 UTC 2003
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     milan.schulte@offis.de
 > >Release:        unknown-1.0
 > >Organization:
 > >Environment:
 > 
 > >Description:
 > Using GDB 5.3 from console of DDD 3.3.1 to print the content of an object aborts at some attribute:
 > 
 > (gdb) print (*this)
 > $15 = (ControlEndCon [incomplete object]) {
 >   <ControlNode> = {
 >     <GraphNode> = {
 >       <Node> = {
 >         <Element> = {
 >           <Base> = {
 >             _vptr.Base = 0x85c5038
 >           }, <No data fields>}, 
 >         members of Node: 
 >         myLocalSet = {Cannot access memory at address 0xfffffff4
 > (gdb)
 > 
 > The attribute myLocalSet is *not* a pointer. Printing the attribute with the following command works:
 > 
 > (gdb) print (*this).myLocalSet
 > $17 = (StorageUnitSet) {
 >   <Element> = {
 >     <Base> = {
 >       _vptr.Base = 0x859b9d0
 >     }, <No data fields>}, 
 >   <ComparableList<StorageUnit*>> = {
 >     <List<StorageUnit*>> = {
 >       <BasicType> = {
 >         _vptr.BasicType = 0x859b9d0
 >       }, 
 >       members of List<StorageUnit*>: 
 >       mySize = 0, 
 >       myIteratorCount = 0, 
 >       myHead = 0x0, 
 >       myTail = 0x0
 >     }, <No data fields>}, <No data fields>}
 > (gdb) 
 > 
 > I'm using g++ (GCC) 3.3 and binutils 2.13.90.0.18 (i486-suse-linux) using BFD version 2.13.90.0.18
 > 
 > The above works with the same source code using GCC 2.95.2, binutils 2.9.5, GDB 5.1.1, DDD 3.3.1.
 > 
 > Any hints appreciated!
 
 Could you please:
   - Try a CVS snapshot of GDB
 and/or
   - Provide a small test case for the problem
 
 ?
 
 -- 
 Daniel Jacobowitz
 MontaVista Software                         Debian GNU/Linux Developer