* Gcc-4.0 vtable layout on IA64
@ 2005-07-18 17:36 Martin Kittel
0 siblings, 0 replies; only message in thread
From: Martin Kittel @ 2005-07-18 17:36 UTC (permalink / raw)
To: gcc-help
Hi,
While trying to get the MaxDB sources compiled with gcc 4.0 on an IA64
machine I stumbled over the following comment describing the vtable layout:
* gcc 3.1 on ia64 uses new c++ abi (without runtime type info):
*
* pInterface -> 0 ----------- 0 -----------------------
* ! virt.Meth ! ------->| gp0 | Method 0 |
* ----------- |------------| |
* ! : ! 8 | offset0 | |
* ------------+----------|
* 16 | gp1 | Method 1 |
* ------------| |
* 24 | offset1 | |
* ------------+----------|
* | : | : |
* :
* | : | : |
* ------------+----------|
* 16*(n-1)+0 | gp n | Method n |
* ------------| |
* 16*(n-1)+8 | offset n | |
* ------------+----------
I was wondering if this is still correct with gcc 4.0 or whether there
the formula should be 8*(n-1) to access method n (as that seems to
correspond to what you have on i386)?
Thanks for any help,
Martin.
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2005-07-18 17:36 Gcc-4.0 vtable layout on IA64 Martin Kittel
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