From: W.Stuehlmeyer@t-online.de
To: gcc-help@gcc.gnu.org
Subject: dynamic vtables in c-program's on ia64
Date: Wed, 05 Jun 2002 03:36:00 -0000 [thread overview]
Message-ID: <1023273350.3cfde98608434@webmail.t-online.de> (raw)
Hello,
i have dynamically created c-programs with vtable structures.
Example:
typedef struct IMallocVtbl
{
HRESULT ( *QueryInterface) (IMalloc * pThis, const IID & riid, void
** ppvObject);
ULONG ( *AddRef) (IMalloc * pThis);
ULONG ( *Release) (IMalloc * pThis);
void * ( *Alloc) (IMalloc * pThis, ULONG cb);
...
} IMallocVtbl;
typedef struct CMalloc
{
IMallocVtbl *lpVtbl;
} CMalloc;
IMallocVtbl * g_lpVtblMalloc = 0;
CMalloc g_CMalloc;
IMalloc * g_pMalloc = (IMalloc *) &g_CMalloc;
IMallocVtbl CRetailMallocVtbl =
{
CMalloc_QueryInterface,
CMalloc_AddRef,
CMalloc_Release,
CRetailMalloc_Alloc,
...
};
HRESULT MallocInitialize(BOOL fForceLocalAlloc)
{
...
g_lpVtblMalloc = &CRetailMallocVtbl;
g_CMalloc.lpVtbl = g_lpVtblMalloc;
return hr;
}
extern "C" LPVOID CoTaskMemAlloc(ULONG ulcb)
{
if (g_CMalloc.lpVtbl == 0) {
MallocInitialize(0);
}
//
// SEGMENTATION VIOLATION
//
return g_pMalloc->Alloc(ulcb);
}
I create a function address pointer in CRetailMallocVtbl.
With gcc 3.0.x it works fine, but gcc 3.1 has a new ABI and
g_pMalloc->Alloc(ulcb) needs a <function address; GP address pointer>
pair on a itanium machine.
I have no idea how could create a GP adress pointer or a function
address/GP address pair from a C. I found no information on
www.codesourcecery.org how
could i create these address pairs.
How can i solve this problem?
Only IMallocVtbl could be modified ( typedef struct IMallocVtbl ... and
IMallocVtbl CRetailMallocVtbl = ..) via macros in a header file.
next reply other threads:[~2002-06-05 10:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-05 3:36 W.Stuehlmeyer [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-06-05 3:36 W.Stuehlmeyer
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