Leaked source code of windows server 2003
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320 lines
6.0 KiB

/*++
Copyright c 1994 Microsoft Corporation. All rights reserved.
Module Name:
forward.c
Abstract:
This module implements the proxy forwarding functions.
Author:
ShannonC 26-Oct-94
Environment:
Any mode.
Revision History:
--*/
#define STDMETHODCALLTYPE __stdcall
/*++
VOID
NdrProxyForwardingFunction<nnn>(...)
Routine Description:
This function forwards a call to the proxy for the base interface.
Arguments:
This [esp+4] - Points to an interface proxy.
Return Value:
None.
--*/
// Here is what a forwarder looks like
// we must:
// change the "this" pointer in [esp+4] to point to the delegated object
// fetch the correct entry from the vtable
// call the function
#define SUBCLASS_OFFSET 16
#define VTABLE_ENTRY(n) n*4
// Stop the C++ compiler from adding additional push instructions
// as well as generating the return sequence for the forwarder
// and so messing up our assembly stack when using -Od, etc.
// by using the _declspec().
#define DELEGATION_FORWARDER(method_num) \
_declspec(naked) \
void STDMETHODCALLTYPE NdrProxyForwardingFunction##method_num() \
{ \
/*Get this->pBaseProxy */ \
__asm{mov eax, [esp + 4]} \
__asm{mov eax, [eax + SUBCLASS_OFFSET]} \
__asm{mov [esp + 4], eax} \
/*Get this->pBaseProxy->lpVtbl*/ \
__asm{mov eax, [eax]} \
/*Jump to interface member function*/ \
__asm{mov eax, [eax + VTABLE_ENTRY(method_num)]} \
__asm{jmp eax} \
}
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