windows-xp/Source/XPSP1/NT/com/rpc/ndr20/i386/forward.c

/*++

  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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