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c++/10893: wrong class mapping for empty bases
- From: yanliu at ca dot ibm dot com
- To: gcc-gnats at gcc dot gnu dot org
- Date: 21 May 2003 02:34:36 -0000
- Subject: c++/10893: wrong class mapping for empty bases
- Reply-to: yanliu at ca dot ibm dot com
>Number: 10893
>Category: c++
>Synopsis: wrong class mapping for empty bases
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Wed May 21 02:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Yan Liu
>Release: unknown-1.0
>Organization:
>Environment:
linuxppc system, version 3.2 32bit mode.
>Description:
>How-To-Repeat:
using -fdump-class-hierarchy option to get the class layout of the above testcase. You will find the empty base class E1 and E are at offset 4 in struct D1 class layout. There is a another data member also be mapped at the same address, which is wrong according to C++ ABI.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="kaka.C"
Content-Disposition: inline; filename="kaka.C"
struct E {};
struct E1: public E {};
struct E2: public E {};
struct D: public virtual E1, public E2 {
};
struct D1: public D {
int d1;
};
D1 objd1;