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Date: Thu, 01 Jul 2010 07:20:00 -0000
From: "andre dot poenitz at nokia dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Message-ID: <20100701072012.11777.andre.poenitz@nokia.com>
Reply-To: sourceware-bugzilla@sourceware.org
Subject: [Bug python/11777] New: Strange behaviour of gdb.Type.fields
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I sometimes cannot get a proper list of members from structures that do have
members:


This accesses a "real" QRegionPrivate object in a 'QRegion region;':

  python print
gdb.parse_and_eval(\"region\")[\"d\"].dereference()[\"qt_rgn\"].dereference().type

  -> struct myns::QRegionPrivate
 
  python print
gdb.parse_and_eval(\"region\")[\"d\"].dereference()[\"qt_rgn\"].dereference().type.fields()

-> []


If I "create" the type manually I get:
 
  python print gdb.parse_and_eval(\"('myns::QRegionPrivate'*)0\").dereference().type
    -> myns::QRegionPrivate

  python print gdb.parse_and_eval(\"('myns::QRegionPrivate'*)0
\").dereference().type.fields()

    -> [<gdb.Field object at 0xb7764ac0>, <gdb.Field object at 0xb7764af0>,
<gdb.Field object at 0xb7764b20>, <gdb.Field object at 0xb7764b50>, <gdb.Field
object at 0xb7764b80>]

 
Note the extra "struct " in the 'type' output in the first case.

The problem also disappears when I use  type = gdb.lookup_type(str(type)) 
before accessing fields().

-- 
           Summary: Strange behaviour of gdb.Type.fields
           Product: gdb
           Version: 7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: andre dot poenitz at nokia dot com
                CC: gdb-prs at sourceware dot org
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11777

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