windows-xp/Source/XPSP1/NT/com/rpc/midl/codegen/arrayndr.cxx

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Copyright (c) 1993-2000 Microsoft Corporation

 Module Name:

    arrayndr.cxx

 Abstract:

    Contains routines for the generation of the new NDR format strings for
    array types, and the new NDR marshalling and unmarshalling calls.

 Notes:


 History:

    DKays     Oct-1993     Created.
 ----------------------------------------------------------------------------*/

#include "becls.hxx"
#pragma hdrstop

#define OUT_CORRELATION_DESC( x, y )    (x)->PushCorrelationFlagsShort(y)

//*************************************************************************
// CG_ARRAY
//*************************************************************************

BOOL
CG_ARRAY::GenNdrFormatArrayProlog( CCB * pCCB )
/*++

Routine Description :

    Handles some common tasks for array Ndr format string generation.

Arguments :

    pCCB    - pointer to code control block

Return :

    TRUE if format string generation should continue, FALSE if the format
    string for the array has already been generated.

 --*/
{
    FORMAT_STRING *     pFormatString;
    CG_NDR *            pChild;

    if ( GetFormatStringOffset() != -1 )
        return FALSE;

    pFormatString = pCCB->GetFormatString();

    pChild = (CG_NDR *) GetChild();

    if ( pChild->IsArray() )
        {
        SetIsInMultiDim( TRUE );
        ((CG_ARRAY *)pChild)->SetIsInMultiDim( TRUE );
        }

    //
    // If the array's element type is a structure, pointer, or another array
    // then generate either it's description (structure/array) or it's
    // pointee's description (pointer).
    //
    if ( pChild->IsStruct() ||
         pChild->IsArray() ||
         pChild->IsUnion() ||
         pChild->IsInterfacePointer() ||
         pChild->IsXmitRepOrUserMarshal() )
        {
        pChild->GenNdrFormat( pCCB );
        }

    if ( pChild->IsPointer() && 
        !pChild->IsInterfacePointer() )
        {
        // Only generate the pointee format string if the pointee is not a
        // base type or non-sized string pointer.
        if ( ! pChild->IsPointerToBaseType() &&
             (pChild->GetCGID() != ID_CG_STRING_PTR) )
            ((CG_POINTER *)pChild)->GenNdrFormatPointee( pCCB );
        }

    SetFormatStringOffset( pFormatString->GetCurrentOffset() );

    //
    // If this is a cs_char array, generate the FC_CS_ARRAY prolog
    //
    GenNdrCSArrayProlog( pCCB );

    //
    // For an array which has [unique] or [ptr] applied to it, we generate
    // a format string description of a pointer to the array.
    //
    if ( GetPtrType() != PTR_REF )
        {
        pFormatString->PushFormatChar( GetPtrType() == PTR_UNIQUE ?
                                       FC_UP : FC_FP );
        pFormatString->PushByte( 0 );
        pFormatString->PushShortOffset( 2 );
        }

    //
    // Check if this is a complex array.
    //
    if ( IsComplex() ) 
        {
        GenNdrFormatComplex( pCCB );
        return FALSE;
        }

    // Push the type.
    switch ( GetCGID() )
        {
        case ID_CG_ARRAY :
        case ID_CG_VAR_ARRAY :
            //
            // Fixed and varying array's fill this in later when they know
            // their size.
            //
            pFormatString->PushByte( 0 );
            break;
        case ID_CG_CONF_ARRAY :
            pFormatString->PushFormatChar( FC_CARRAY );
            break;
        case ID_CG_CONF_VAR_ARRAY :
            pFormatString->PushFormatChar( FC_CVARRAY );
            break;
        }

    //
    // Push the correct alignment value.
    //
    pFormatString->PushByte( ( pChild->IsUnion() ? 1 : pChild->GetWireAlignment() ) - 1 );

    return TRUE;
}

BOOL
CG_ARRAY::GenNdrFormatArrayLayout( CCB * pCCB )
{
    FORMAT_STRING *     pFormatString;
    CG_NDR *            pChild;
    BOOL                fCanOptimize = TRUE;

    pFormatString = pCCB->GetFormatString();

    pChild = (CG_NDR *) GetChild();

    //
    // See if we need to generate a pointer layout.
    //
    if ( (pChild->IsPointer() && 
          !pChild->IsInterfacePointer()  ) ||
         (pChild->IsStruct() && ((CG_STRUCT *)pChild)->HasPointer()) )
        {
        //
        // Not home free yet.  Even if the array has pointers, we only
        // output a pointer layout if one of the following is true :
        //   1. The array is a top level parameter.
        //   2. The array is really a fabrication of a size or size length
        //      pointer (of structures which contain pointers).
        //   3. The array is embedded in a complex or hard struct.
        // Otherwise the array's pointer description will be in its structure's
        // pointer layout.
        //
        // We also never generate a pointer layout for complex arrays.
        //
        // We know if it was fabricated from a size or size-length pointer
        // if IsDupedSizePtr() is TRUE.
        //
        // BUGBUG: Another case where we should generate the pointer layout
        //         is if our parent is a simple pointer.  One scenario where
        //         this occurs is a struct containing a pointer to an array.
        //         The simple scenario of a top-level pointer to an array is
        //         taken care of because then the node context is the proc.

        CG_NDR * pParent;

        pParent = pCCB->GetCGNodeContext();
        
        if ( pParent->IsProc() ||
             (pParent->GetCGID() == ID_CG_COMPLEX_STRUCT) ||
             (pParent->IsStruct() && 
              ((CG_STRUCT *)pParent)->IsHardStruct()) ||
             IsDupedSizePtr()
           )
            {
            if ( ! IsComplex() )
                GenNdrFormatArrayPointerLayout( pCCB,
                                                FALSE );
            }
        }

    SetElementDescriptionOffset( pFormatString->GetCurrentOffset() );

    //
    // Now generate the element description.
    //
    if ( pChild->IsStruct() || 
         pChild->IsArray() ||
         pChild->IsUnion() ||
         pChild->IsInterfacePointer() ||
         pChild->IsXmitRepOrUserMarshal() )
        {
        pFormatString->PushFormatChar( FC_EMBEDDED_COMPLEX );

        // Not used.
        pFormatString->PushByte( 0 );

        // if embedded complex member has an offset zero, then it is a
        // recursive definition.  Register it for fixup later.

        if ( pChild->GetFormatStringOffset() == 0 )
            {   
            fCanOptimize = FALSE;
            pCCB->RegisterRecPointerForFixup( 
                            pChild, 
                            pFormatString->GetCurrentOffset() );
            }

        pFormatString->PushShortOffset( pChild->GetFormatStringOffset() - 
                                          pFormatString->GetCurrentOffset() );
        }

    if ( pChild->IsPointer() && 
         !pChild->IsInterfacePointer() )
        {
        // 
        // For complex arrays of pointers we put the actual pointer description
        // in the layout, otherwise we put a long.
        //
        if ( IsComplex() )
            {
            ((CG_POINTER *)pChild)->GenNdrFormatAlways( pCCB );
            // This may return zero when pointee is not generated yet. It would
            // need to be checked if we wanted to call the string optimizer.
            }
        else
            {
            pFormatString->PushFormatChar( FC_LONG );
            }
        }

    if ( pChild->IsSimpleType() )
        {
        pChild->GenNdrFormat( pCCB );
        }

    // Possibly align the format string and spit out the FC_END.
    if ( ! (pFormatString->GetCurrentOffset() % 2) )
        pFormatString->PushFormatChar( FC_PAD );

    pFormatString->PushFormatChar( FC_END );
    SetFormatStringEndOffset( pFormatString->GetCurrentOffset() );

    return fCanOptimize;
}

void
CG_ARRAY::GenNdrFormatArrayPointerLayout( CCB * pCCB,
                                          BOOL  fNoPP )
/*++

Routine Description :

    Generates the Ndr format string pointer layout for a conformant array.

Arguments :

    pCCB    - pointer to the code control block
    fNoPP   - TRUE if no FC_PP or FC_END should be generated

 --*/
{
    ITERATOR            Iterator;
    FORMAT_STRING *     pFormatString;
    CG_STRUCT *         pStruct;
    CG_NDR *            pImbedingNode;
    unsigned long       MemOffsetToArray;
    unsigned long       BufOffsetToArray;
    long                ImbedingMemSize;
    long                ImbedingBufSize;

    // Get the current imbeding sizes.
    ImbedingMemSize = pCCB->GetImbedingMemSize();
    ImbedingBufSize = pCCB->GetImbedingBufSize();

    pFormatString = pCCB->GetFormatString();

    pImbedingNode = pCCB->GetCGNodeContext();

    MemOffsetToArray = ImbedingMemSize;
    BufOffsetToArray = ImbedingBufSize;

    if ( pImbedingNode->IsStruct() )
        {
        pStruct = (CG_STRUCT *) pImbedingNode;

        if ( GetCGID() == ID_CG_CONF_ARRAY ||
             GetCGID() == ID_CG_CONF_VAR_ARRAY )
            {
            ; // Do nothing, imbeding sizes set offset right.
            }
        else // GetCGID() == ID_CG_ARRAY || ID_CG_VAR_ARRAY
            {
            CG_FIELD *      pField;

            //
            // If we're embedded in a complex struct then we do nothing - our
            // offset will end up being 0.
            //
            if ( pStruct->GetCGID() != ID_CG_COMPLEX_STRUCT )
                {
                pField = pStruct->GetArrayField( this );

                //
                // If we don't find the array's field, that's because the 
                // array must have been contained within a union which was
                // part of a Hard Structure.
                //
                if ( pField )
                    {
                    //
                    // What has to be done here is to actually subract the
                    // difference between the struct's sizes and the field's
                    // offsets, since the array appears somewhere inside the 
                    // struct whose size has already been added to the 
                    // imbeding sizes.
                    //
                    MemOffsetToArray -= pStruct->GetMemorySize() -
                                        pField->GetMemOffset();
                    BufOffsetToArray -= pStruct->GetWireSize() -
                                        pField->GetWireOffset();
                    }
                }
            }
        }

    if ( ! fNoPP )
        {
        pFormatString->PushFormatChar( FC_PP );
        pFormatString->PushFormatChar( FC_PAD );
        }

    //
    // Stuff for fixed arrays.
    //
    if ( GetCGID() == ID_CG_ARRAY )
        {
        pFormatString->PushFormatChar( FC_FIXED_REPEAT );
        pFormatString->PushFormatChar( FC_PAD );
        pFormatString->PushShort( (short)
            ((CG_FIXED_ARRAY *)this)->GetNumOfElements() );
        }

    //
    // Stuff for conformant arrays.
    //
    if ( GetCGID() == ID_CG_CONF_ARRAY )
        {
        pFormatString->PushFormatChar( FC_VARIABLE_REPEAT );
        pFormatString->PushFormatChar( FC_FIXED_OFFSET );
        }

    //
    // Stuff for conformant varying and varying arrays.
    //
    if ( GetCGID() == ID_CG_CONF_VAR_ARRAY ||
         GetCGID() == ID_CG_VAR_ARRAY )
        {
        pFormatString->PushFormatChar( FC_VARIABLE_REPEAT );
        pFormatString->PushFormatChar( FC_VARIABLE_OFFSET );
        }

    if ( GetChild()->IsPointer() && 
         !GetChild()->IsInterfacePointer() )
        {
        CG_POINTER *        pPointer;

        pPointer = (CG_POINTER *) GetChild();

        //
        // Push the increment amount between successive pointers.  In this
        // case it's always 4.
        //
        pFormatString->PushShort( (short) SIZEOF_MEM_PTR() );

        // offset_to_array<2>
        pFormatString->PushShort( (short) MemOffsetToArray );

        // number_of_pointers<2> 
        pFormatString->PushShort( (short) 1 );

        // offset_to_pointer_in_memory<2>
        pFormatString->PushShort( (short) MemOffsetToArray );

        // offset_to_pointer_in_buffer<2>
        pFormatString->PushShort( (short) BufOffsetToArray );

        // Push the pointer description.
        pPointer->GenNdrFormatEmbedded( pCCB );
        }

    if ( GetChild()->IsStruct() )
        {
        ITERATOR        Iterator;
        CG_STRUCT *     pStruct;

        long ImbBufSizeSave = pCCB->GetImbedingBufSize();

        pStruct = (CG_STRUCT *) GetChild();

        //
        // Increment between successive pointers is the memory size of
        // the structure.
        //
        pFormatString->PushShort( (short) pStruct->GetMemorySize() );

        // offset_to_array<2>
        pFormatString->PushShort( (short) MemOffsetToArray );

        // number_of_pointers<2>
        pFormatString->PushShort( (short) pStruct->GetNumberOfPointers() );

        if ( GetCGID() == ID_CG_CONF_VAR_ARRAY ||
             GetCGID() == ID_CG_VAR_ARRAY )
            {
            // Account for varying information in the buffer in front of the array.
            // It effectively makes the flat part of the struct bigger.
            // Imbedded size should be zero for top level and non-embedded arrays.
            if ( ImbBufSizeSave )
                pCCB->SetImbedingBufSize( ImbBufSizeSave + 8 );
            }

        pStruct->GenNdrStructurePointerLayout( pCCB, TRUE, TRUE );
        pCCB->SetImbedingBufSize( ImbBufSizeSave );
        } 

    MIDL_ASSERT( !GetChild()->IsUnion() && !GetChild()->IsArray() );

    if ( ! fNoPP )
        pFormatString->PushFormatChar( FC_END );

    SetFormatStringEndOffset( pFormatString->GetCurrentOffset() );
}

void
CG_ARRAY::GenNdrFormatComplex( CCB * pCCB )
{
    FORMAT_STRING *     pFormatString;
    CG_NDR *            pChild;

    pFormatString = pCCB->GetFormatString();

    pChild = (CG_NDR *) GetChild();

    pFormatString->PushFormatChar( FC_BOGUS_ARRAY );

    // Alignment.
    pFormatString->PushByte( ( pChild->IsUnion() ? 1 : pChild->GetWireAlignment() ) - 1 );

    //
    // Number of elements - 0 if conformant.
    //
    switch ( GetCGID() )
        {
        case ID_CG_ARRAY :
            pFormatString->PushShort( (short)
                    ((CG_FIXED_ARRAY *)this)->GetNumOfElements() );
            break;
        case ID_CG_VAR_ARRAY :
            pFormatString->PushShort( (short)
                    ((CG_VARYING_ARRAY *)this)->GetNumOfElements() );
            break;
        default :
            pFormatString->PushShort( (short) 0 );
            break;
        }

    //
    // Conformance description.
    //
    switch ( GetCGID() )
        {
        case ID_CG_CONF_ARRAY :
            ((CG_CONFORMANT_ARRAY *)this)->
              GenFormatStringConformanceDescription( pCCB, 
                                                     IsDupedSizePtr(),
                                                     IsInMultiDim() );
            break;
        case ID_CG_CONF_VAR_ARRAY :
            ((CG_CONFORMANT_VARYING_ARRAY *)this)->
              GenFormatStringConformanceDescription( pCCB, 
                                                     IsDupedSizePtr(),
                                                     IsInMultiDim() );
            break;
        default :
            pFormatString->PushLong( 0xffffffff );
            if ( pCommand->IsSwitchDefined( SWITCH_ROBUST ) )
                {
                OUT_CORRELATION_DESC( pFormatString, 0 );
                }

            break;
        }
    //
    // Variance description.
    //
    switch ( GetCGID() )
        {
        case ID_CG_CONF_VAR_ARRAY :
            ((CG_CONFORMANT_VARYING_ARRAY *)this)->
              GenFormatStringVarianceDescription( pCCB, 
                                                  IsDupedSizePtr(),
                                                  FALSE,
                                                  IsInMultiDim() );
            break;
        case ID_CG_VAR_ARRAY :
            ((CG_VARYING_ARRAY *)this)->
              GenFormatStringVarianceDescription( pCCB, 
                                                  FALSE,
                                                  TRUE,
                                                  IsInMultiDim() );
            break;
        default :
            pFormatString->PushLong( 0xffffffff );
            if ( pCommand->IsSwitchDefined( SWITCH_ROBUST ) )
                {
                OUT_CORRELATION_DESC( pFormatString, 0 );
                }

            break;
        }

    if ( GenNdrFormatArrayLayout( pCCB ) )
        pFormatString->OptimizeFragment( this );

    // This call needs some preparation that I have no time for.
//    FixupEmbeddedComplex( pCCB );
}

long
CG_ARRAY::GetElementSize()
{
    CG_NDR *            pChild;

    pChild = (CG_NDR *) GetChild();

    if ( pChild->IsSimpleType() )
        {
        // Cheat a little.  Size is equal to wire alignment value.
        return pChild->GetWireAlignment();
        }

    if ( pChild->IsPointer() )
        return SIZEOF_MEM_PTR();

    if ( pChild->IsStruct() )
        return ((CG_STRUCT *)pChild)->GetMemorySize();

    if ( pChild->IsArray() )
        {
        MIDL_ASSERT ( pChild->GetCGID() == ID_CG_ARRAY );

        CG_FIXED_ARRAY * pArray = (CG_FIXED_ARRAY *) pChild;

        return pArray->GetElementSize() * pArray->GetNumOfElements();
        }

    if ( pChild->IsInterfacePointer()  )
        return SIZEOF_MEM_PTR();

    MIDL_ASSERT( !"Shouldn't be able to get here" );

    return 0;   // for the compiler
}

BOOL                    
CG_ARRAY::IsComplex()
{
    if ( IsForcedComplex() )
        {
        return TRUE;
        }
    //
    // If this is a conformant and/or varying array, then it becomes
    // complex if it is part of a multidimensional array (but not a multi
    // level sized pointer).
    //
    if ( (GetCGID() == ID_CG_CONF_ARRAY) ||
         (GetCGID() == ID_CG_CONF_VAR_ARRAY) ||
         (GetCGID() == ID_CG_VAR_ARRAY) )
        {
        if ( IsInMultiDim() && ! IsDupedSizePtr() )
            return TRUE;
        }

    // multi dimensional array of struct embedding pointers needs to be
    // marked complex.
    if ( IsFixedArray() && IsInMultiDim() && HasPointer() )
         return TRUE;

    CG_NDR* pChild = ( CG_NDR* ) GetChild();

    // [range] on an element of an array makes the array complex
    if ( pChild->GetRangeAttribute() )
        {
        return TRUE;
        }

    //
    // Is the array complex by Ndr Engine standards.  Any array of complex
    // or hard structs, encapsulated unions, transmit_as or represent_as, 
    // enums, ref pointers, or another complex array, is complex.
    //
    // Any multidimensional array with at least one dimension with conformance 
    // or variance is complex as well.
    //
    // On 64bit platforms array of pointers are also complex.
    //
    switch ( pChild->GetCGID() )
        {
        case ID_CG_STRUCT :
            return( ((CG_STRUCT *)GetChild())->IsComplexStruct() ||
                    ((CG_STRUCT *)GetChild())->IsHardStruct()    ||
                    GetWireSize() != GetMemorySize() ); 

        case ID_CG_ARRAY :
            switch ( GetCGID() )
                {
                case ID_CG_CONF_ARRAY :
                case ID_CG_CONF_VAR_ARRAY :
                case ID_CG_VAR_ARRAY :
                    return TRUE;
                default :
                    //
                    // The array is complex if the next lower fixed array 
                    // dimension is complex.
                    //
                    return ((CG_ARRAY *) GetChild())->IsComplex();
                }

        case ID_CG_COMPLEX_STRUCT :
        case ID_CG_ENCAP_STRUCT :
        case ID_CG_CONF_ARRAY :
        case ID_CG_CONF_VAR_ARRAY :
        case ID_CG_VAR_ARRAY :
        case ID_CG_STRING_ARRAY :
        case ID_CG_CONF_STRING_ARRAY :
        case ID_CG_TRANSMIT_AS :
        case ID_CG_REPRESENT_AS :
        case ID_CG_USER_MARSHAL :
        case ID_CG_INTERFACE_PTR :
        case ID_CG_IIDIS_INTERFACE_PTR :
        case ID_CG_INT3264 :
            return TRUE;

        case ID_CG_ENUM :
            //
            // The array is complex if it is an array of enum16 or __int3264,
            //  and for a similar reason, bigger in memory than on wire.
            //
            return ! ((CG_ENUM *)GetChild())->IsEnumLong();

        case ID_CG_CONF_STRUCT :
        case ID_CG_CONF_VAR_STRUCT :
            return TRUE;

        default :
            //
            // Make a final check for an array of ref pointers.
            //
            if ( GetChild()->IsPointer() )
                {
                if ( pCommand->Is64BitEnv() )
                    return TRUE;
                else
                    return (((CG_POINTER *)GetChild())->GetPtrType() == PTR_REF);

                }

            return FALSE;
        }
}

BOOL                    
CG_ARRAY::IsMultiConfOrVar()
{
    CG_NDR * pNdr;

    switch ( GetCGID() )
        {
        case ID_CG_CONF_ARRAY :
        case ID_CG_CONF_VAR_ARRAY :
        case ID_CG_VAR_ARRAY :
            break;
        default :
            return FALSE;
        }

    //
    // Search for an inner dimension array other than fixed.
    //
    pNdr = (CG_NDR *) GetChild();

    for ( ; pNdr && pNdr->IsArray(); pNdr = (CG_NDR *) pNdr->GetChild() )
        {   
        if ( pNdr->GetCGID() == ID_CG_ARRAY )
            continue;
        else
            return TRUE;
        }

    return FALSE;
}

BOOL
CG_ARRAY::ShouldFreeOffline()
{
    CG_NDR *    pChild;

    pChild = (CG_NDR *) GetChild();

    switch ( GetCGID() )
        {
        case ID_CG_STRING_ARRAY :
        case ID_CG_CONF_STRING_ARRAY :
            return FALSE;

        default :
            if ( pChild->IsSimpleType() )
                return FALSE;

            if ( pChild->IsStruct() )
                return ((CG_STRUCT *)pChild)->ShouldFreeOffline();

            if ( pChild->IsArray() )
                return ((CG_ARRAY *)pChild)->ShouldFreeOffline();
                
            return TRUE;
        }
}

void
CG_ARRAY::GenFreeInline( CCB * pCCB )
{
    CG_PARAM *  pParam;
    BOOL        fFree;

    fFree = FALSE;

    pParam = (CG_PARAM *) pCCB->GetLastPlaceholderClass();

    //
    // Don't free a [unique] or [ptr] array inline.
    //
    if ( GetPtrType() != PTR_REF )
        return;

    if ( IsComplex() )
        {
        //
        // If the array is complex then we must free it unless it is a
        // fixed or varying array of ref pointers or an [out] fixed or varying 
        // array.
        // Pointer in 64 bit env is already complex
        if ( ! pParam->IsParamIn() || 
              GetBasicCGClass()->IsPointer()  )
            fFree = (GetCGID() == ID_CG_CONF_ARRAY) ||
                    (GetCGID() == ID_CG_CONF_VAR_ARRAY) ;
        else
            fFree = TRUE;
        }
    else
        {
        //
        // For non complex arrays the rules are :
        //  Fixed - never free, we use the buffer.
        //  Conformant - free if [out] only.
        //  Conformant Varying - always free.
        //  Varying - free if [in] or [in,out].
        // 
        //  String array - free always.
        //  Conformant string array - free if sized.
        //
        switch ( GetCGID() )
            {
            case ID_CG_ARRAY :
                break; 

            case ID_CG_CONF_ARRAY :
                fFree = ! pParam->IsParamIn();
                break;

            case ID_CG_CONF_VAR_ARRAY :
                fFree = TRUE;
                break;

            case ID_CG_VAR_ARRAY :
                fFree = pParam->IsParamIn();
                break;

            case ID_CG_STRING_ARRAY :
                fFree = TRUE;
                break;
            
            case ID_CG_CONF_STRING_ARRAY :
                fFree = GetSizeIsExpr() != 0;
                break;
            }
        }

    if ( fFree )
        Out_FreeParamInline( pCCB );
}

//*************************************************************************
// CG_FIXED_ARRAY
//*************************************************************************

void 
CG_FIXED_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a fixed array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING *     pFormatString = pCCB->GetFormatString();
    unsigned long       ArraySize;

    if ( GenNdrFormatArrayProlog( pCCB ) )
        {
        MIDL_ASSERT( GetSizeIsExpr()->IsConstant() );

        ArraySize = GetNumOfElements() * GetElementSize();

        //
        // If the array size is >= 64K then the format is different.
        //
        if ( ArraySize >= (64 * 1024) )
            {
            pFormatString->PushFormatChar( FC_LGFARRAY,
                                           pFormatString->GetCurrentOffset() - 2 );
            pFormatString->PushLong( ArraySize );
            }
        else
            {
            pFormatString->PushFormatChar( FC_SMFARRAY,
                                           pFormatString->GetCurrentOffset() - 2 );
            pFormatString->PushShort( (short) ArraySize );
            }

        if ( GenNdrFormatArrayLayout( pCCB ) )
            pFormatString->OptimizeFragment( this );
        }
}

long
CG_FIXED_ARRAY::FixedBufferSize( CCB * pCCB )
{
    CG_NDR *    pNdr;
    long        BufSize;
    long        TotalSize;

    pNdr = (CG_NDR *)GetChild();

    // skip these nodes to get to the transmitted element type.

    if ( pNdr->IsXmitRepOrUserMarshal() )
        pNdr = (CG_NDR *)pNdr->GetChild();

    if ( pNdr->IsPointer() && ((CG_POINTER *)pNdr)->IsPointerToBaseType() )
        {
        CG_POINTER * pPointer;

        //
        // Special case arrays of pointers to base types so that we 
        // don't grossly overestimate the buffer size.
        //

        pPointer = (CG_POINTER *) pNdr;
        pNdr = (CG_NDR *) pNdr->GetChild();

        // If this is the 64bit transfer syntax, include 
        // the size of ref pointers in the buffer size.

        BufSize = ( ( pPointer->GetPtrType() == PTR_REF ) &&
                    !pCommand->IsNDR64Run() ) ? 0 : SIZEOF_WIRE_PTR();
        
        BufSize += pNdr->GetWireSize(); 

        return MAX_WIRE_ALIGNMENT + (GetNumOfElements() * BufSize);
        }

    if ( pNdr->IsStruct() || pNdr->IsArray() || pNdr->IsPointer() 
         || pNdr->IsUnion() )
        {
        BufSize = pNdr->FixedBufferSize( pCCB );

        if ( BufSize == -1 ) 
            return -1;

        // Success!
        TotalSize = GetNumOfElements() * BufSize;
        }
    else
        {
        // Fixed array of basetypes.
        TotalSize = MAX_WIRE_ALIGNMENT + GetWireSize();
        }

    return TotalSize;
}

//*************************************************************************
// CG_CONFORMANT_ARRAY
//*************************************************************************

void
CG_CONFORMANT_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a conformant or array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING *     pFormatString = pCCB->GetFormatString();
    long                ElementSize;

    if ( ! GenNdrFormatArrayProlog( pCCB ) )
        return;

    ElementSize = GetElementSize();

    if ( ElementSize >= (64 * 1024) )
        {
        RpcError(NULL, 0, ARRAY_ELEMENT_TOO_BIG, GetSymName());
        exit(ARRAY_ELEMENT_TOO_BIG);
        }

    pFormatString->PushShort( ElementSize );

    GenFormatStringConformanceDescription( pCCB, 
                                           IsDupedSizePtr(),
                                           IsInMultiDim() );

    if ( GenNdrFormatArrayLayout( pCCB ) )
        pFormatString->OptimizeFragment( this );

}

//*************************************************************************
// CG_CONFORMANT_VARYING_ARRAY
//*************************************************************************

void CG_CONFORMANT_VARYING_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a conformant varying array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING *     pFormatString = pCCB->GetFormatString();
    long                ElementSize;

    if ( ! GenNdrFormatArrayProlog( pCCB ) )
        return;

    ElementSize = GetElementSize();

    if ( ElementSize >= (64 * 1024) )
        {
        RpcError(NULL, 0, ARRAY_ELEMENT_TOO_BIG, GetSymName());
        exit(ARRAY_ELEMENT_TOO_BIG);
        }

    pFormatString->PushShort( ElementSize );

    GenFormatStringConformanceDescription( pCCB, 
                                           IsDupedSizePtr(),
                                           IsInMultiDim() );

    GenFormatStringVarianceDescription( pCCB,
                                        IsDupedSizePtr(),
                                        FALSE,
                                        IsInMultiDim() );

    if ( GenNdrFormatArrayLayout( pCCB ) )
        pFormatString->OptimizeFragment( this );

}

void CG_VARYING_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a varying array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING *     pFormatString = pCCB->GetFormatString();
    long                Elements;
    long                ElementSize;
    long                ArraySize;

    if ( ! GenNdrFormatArrayProlog( pCCB ) )
        return;

    //
    // Size must be constant.
    //
    MIDL_ASSERT( GetSizeIsExpr()->IsConstant() );

    Elements = GetNumOfElements();
    ElementSize = GetElementSize();

    ArraySize = Elements * ElementSize;

    //
    // Check if this is a large varying array.
    //
    if ( ArraySize >= (64 * 1024) )
        {
        pFormatString->PushFormatChar( FC_LGVARRAY,
                                       pFormatString->GetCurrentOffset() - 2 );
        pFormatString->PushLong( ArraySize );
        pFormatString->PushLong( Elements );
        }
    else
        {
        pFormatString->PushFormatChar( FC_SMVARRAY,
                                       pFormatString->GetCurrentOffset() - 2 );
        pFormatString->PushShort( ArraySize );
        pFormatString->PushShort( Elements );
        }

    pFormatString->PushShort( ElementSize );

    GenFormatStringVarianceDescription( pCCB,
                                        FALSE,
                                        TRUE,
                                        FALSE );

    if ( GenNdrFormatArrayLayout( pCCB ) )
        pFormatString->OptimizeFragment( this );

}

//*************************************************************************
// CG_STRING_ARRAY
//*************************************************************************

void CG_STRING_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a string array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING * pFormatString;

    if ( GetFormatStringOffset() != -1 )
        return;

    pFormatString = pCCB->GetFormatString();

    SetFormatStringOffset( pFormatString->GetCurrentOffset() );

    GenNdrCSArrayProlog( pCCB );

    if ( IsStringableStruct() )
        {
        pFormatString->PushFormatChar( FC_SSTRING );
        pFormatString->PushByte( ((CG_NDR *)GetChild())->GetWireSize() );
        }
    else
        {
        switch ( ((CG_BASETYPE *)GetChild())->GetFormatChar() )
            {
            case FC_CHAR :
            case FC_BYTE :
                pFormatString->PushFormatChar( FC_CSTRING );
                break;
            case FC_WCHAR :
                pFormatString->PushFormatChar( FC_WSTRING );
                break;
            default :
                MIDL_ASSERT(0);
            }

        pFormatString->PushFormatChar( FC_PAD );
        }

    MIDL_ASSERT( GetSizeIsExpr()->IsConstant() );

    __int64 SizeIs = GetSizeIsExpr()->GetValue();

    if ( _UI16_MAX <= SizeIs )
        {
        RpcError(NULL, 0, ARRAY_SIZE_EXCEEDS_64K, GetSymName());
        exit(ARRAY_SIZE_EXCEEDS_64K);
        }

    pFormatString->PushShort( (short) SizeIs );

    // optimize away duplicates
    SetFormatStringEndOffset( pFormatString->GetCurrentOffset() );

    pFormatString->OptimizeFragment( this );

}

void CG_CONFORMANT_STRING_ARRAY::GenNdrFormat( CCB * pCCB )
/*++

Routine Description :

    Generates the Ndr format string for a conformant string array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    FORMAT_STRING * pFormatString;

    if ( GetFormatStringOffset() != -1 )
        return;

    pFormatString = pCCB->GetFormatString();

    SetFormatStringOffset( pFormatString->GetCurrentOffset() );

    GenNdrCSArrayProlog( pCCB );

    if ( IsStringableStruct() )
        {
        pFormatString->PushFormatChar( FC_C_SSTRING );
        pFormatString->PushByte( ((CG_NDR *)GetChild())->GetWireSize() );
        }
    else
        {
        switch ( ((CG_BASETYPE *)GetChild())->GetFormatChar() )
            {
            case FC_CHAR :
            case FC_BYTE :
                pFormatString->PushFormatChar( FC_C_CSTRING );
                break;
            case FC_WCHAR :
                pFormatString->PushFormatChar( FC_C_WSTRING );
                break;
            default :
                MIDL_ASSERT(0);
            }
        }

    if ( GetSizeIsExpr() )
        {
        pFormatString->PushFormatChar( FC_STRING_SIZED );

        if ( IsStringableStruct() )
            pFormatString->PushFormatChar( FC_PAD );

        //
        // Set the IsPointer parameter to FALSE.
        //
        GenFormatStringConformanceDescription( pCCB, FALSE, IsInMultiDim() );
        }
    else
        {
        if ( ! IsStringableStruct() )
            pFormatString->PushFormatChar( FC_PAD );
        }

    // optimize away duplicates
    SetFormatStringEndOffset( pFormatString->GetCurrentOffset() );

    pFormatString->OptimizeFragment( this );

}

//*************************************************************************
// CG_CONF_ATTRIBUTE
//*************************************************************************

void
CG_CONF_ATTRIBUTE::GenFormatStringConformanceDescription( 
    CCB * pCCB,
    BOOL  IsPointer,
    BOOL  IsMultiDArray )
/*++

Routine Description :

    Generates the conformace description field for a conformant (varying)
    array.

Arguments :

    pCCB    - pointer to the code control block

 --*/
{
    GenNdrFormatAttributeDescription( pCCB,
                                      GetMinIsExpr(),
                                      GetSizeIsExpr(),
                                      IsPointer,
                                      FALSE,
                                      FALSE,
                                      IsMultiDArray,
                                      pCommand->IsSwitchDefined( SWITCH_ROBUST ) );
}

//*************************************************************************
// CG_VARY_ATTRIBUTE
//*************************************************************************

void
CG_VARY_ATTRIBUTE::GenFormatStringVarianceDescription( 
    CCB *   pCCB,
    BOOL    IsPointer,
    BOOL    IsVaryingArray,
    BOOL    IsMultiDArray )
/*++

Routine Description :

    Generates the variance description for a (conformant) varying array.

Arguments :

    pCCB    - pointer to the code control block
    IsPointer   - TRUE if the array is actually a length_is pointer
    IsVaryingArray  - TRUE if the array is varying only

 --*/
{
    GenNdrFormatAttributeDescription( pCCB,
                                      GetFirstIsExpr(),
                                      GetLengthIsExpr(),
                                      IsPointer,
                                      FALSE,
                                      IsVaryingArray,
                                      IsMultiDArray,
                                      pCommand->IsSwitchDefined( SWITCH_ROBUST ) );
}

void
GenNdrFormatAttributeDescription( CCB *         pCCB,
                                  expr_node *   pMinExpr,
                                  expr_node *   pSizeExpr,
                                  BOOL          IsPointer,
                                  BOOL          IsUnion,
                                  BOOL          IsVaryingArray,
                                  BOOL          IsMultiDArray,
                                  BOOL          fGenCorrelationDesc,
                                  unsigned char uFlags
                                  )
/*++

Routine Description :

    Generates the conformance, variance, switch_is, or iid_is description for
    an array, pointer, union, or interface pointer.

Arguments :

    pCCB        - Pointer to code control block.
    pMinExpr    - Either the min_is expression (conformance), first_is
                  expression (variance), or 0 for a switch_is (union)
                  or iid_is (interface pointer).
    pSizeExpr   - Either the size_is (conformance), length_is (variance), 
                  switch_is (union), or iid_is (interface pointer) expression.
    IsPointer   - Is the conformance or variance a pointer attribute.
    IsUnion     - Are we generating a switch_is description.

--*/
{
    FORMAT_STRING *     pFormatString;
    node_skl *          pAttributeNodeType;
    long                Offset;
    FORMAT_CHARACTER    Op;
    unsigned char       Type;
    unsigned char       uConfFlags = uFlags;
    pFormatString = pCCB->GetFormatString();

    //
    // Make sure the min_is() or first_is() is constant 0.
    // The pMinExpr is NULL if we're handling a union's switch_is.
    //
    if ( pMinExpr )
        {
        if ( ! pMinExpr->IsConstant() ) 
            goto ComplexAttribute;
        else
            if ( ((expr_constant *)pMinExpr)->GetValue() != 0 )  
                goto ComplexAttribute;
        }

    if ( pSizeExpr->IsConstant() )
        {
        __int64    Size;

        pFormatString->PushCorrelationTypeByte( FC_CONSTANT_CONFORMANCE );

        Size = ((expr_constant *)pSizeExpr)->GetValue();

        //
        // We push the lower 24 bits of the constant size.
        //
        pFormatString->PushByte( (char) ((Size & 0x00ff0000) >> 16) );
        pFormatString->PushShort( (short) (Size & 0x0000ffff) );
        if ( fGenCorrelationDesc )
            {
            OUT_CORRELATION_DESC( pFormatString, uConfFlags );
            }
        return;
        }

    if ( pSizeExpr->IsAVariable() )
        {
        Op = FC_ZERO;
        pAttributeNodeType = pSizeExpr->GetType();
        }
    else
        {
        expr_node * pLeftExpr;
        expr_node * pRightExpr;
        OPERATOR        Operator;

        if ( pSizeExpr->IsBinaryOperator() )
            {
            pLeftExpr = ((expr_op_binary *)pSizeExpr)->GetLeft();
            pRightExpr = ((expr_op_binary *)pSizeExpr)->GetRight();
            }
        else
            if ( pSizeExpr->IsUnaryOperator() )
                pLeftExpr = ((expr_op_unary *)pSizeExpr)->GetLeft();
            else
                goto ComplexAttribute;

        switch ( Operator = ((expr_operator *)pSizeExpr)->GetOperator() )
            {
            case OP_SLASH :
            case OP_STAR :
                if ( pLeftExpr->IsAVariable() &&
                     pRightExpr->IsConstant() &&
                     ((expr_constant *)pRightExpr)->GetValue() == 2 )
                    {
                    Op = ((Operator == OP_SLASH) ? FC_DIV_2 : FC_MULT_2);

                    pAttributeNodeType = pLeftExpr->GetType();
                    }
                else
                    {
                    goto ComplexAttribute;
                    }
                break;

            case OP_PLUS :
            case OP_MINUS :
                if ( ( pLeftExpr->IsAVariable() &&
                       pRightExpr->IsConstant() &&
                       ((expr_constant *)pRightExpr)->GetValue() == 1 ) ||
                     ( pRightExpr->IsAVariable() &&
                       pLeftExpr->IsConstant() &&
                       ((expr_constant *)pLeftExpr)->GetValue() == 1 ) )
                    {
                    Op = ((Operator == OP_PLUS) ? FC_ADD_1 : FC_SUB_1);

                    pAttributeNodeType = pLeftExpr->GetType();
                    }
                else
                    {
                    goto ComplexAttribute;
                    }
                break;

            case OP_UNARY_INDIRECTION :
                if ( ! pLeftExpr->IsAVariable() )
                    goto ComplexAttribute;

                pAttributeNodeType = pLeftExpr->GetType();

                Op = FC_DEREFERENCE;

                break;

            default :
                goto ComplexAttribute;
            }
        }

    // Will hold the switch_is node.
    CG_NDR *        pSwitchNode;

    //
    // Check if this is top level conformance.
    //
    if (  pCCB->GetCGNodeContext()->IsProc() )
        {
        CG_PROC *       pProc       = (CG_PROC *) pCCB->GetCGNodeContext();
        CG_PARAM *      pParam      = 0;
        CG_PARAM*       pCurrParam  = ( CG_PARAM*) pCCB->GetCurrentParam();
        CG_NDR*         pFirst      = 0;

        CG_ITERATOR     Iterator;

        if ( (pProc->GetOptimizationFlags() & OPTIMIZE_SIZE) &&
             IsMultiDArray )
            Type = FC_TOP_LEVEL_MULTID_CONFORMANCE;
        else
            Type = FC_TOP_LEVEL_CONFORMANCE;

        pProc->GetMembers( Iterator );
        //
        // Find out the type of the attribute descriptor.
        //
        while ( ITERATOR_GETNEXT( Iterator, pParam ) )
            {
            // determine early/late correlation
            if ( pFirst == 0 )
                {
                if ( pCurrParam == pParam )
                    {
                    pFirst = pParam;
                    }
                }
            if ( pParam->GetType() == pAttributeNodeType )
                {
                // determine early/late correlation
                if ( pFirst == 0 )
                    {
                    pFirst = pParam;
                    uConfFlags |= FC_EARLY_CORRELATION;
                    }
                break;
                }
            }

        if ( ( ( node_param* ) pAttributeNodeType )->IsSaveForAsyncFinish() )
            {
            uConfFlags |= FC_SPLIT_CORRELATION;
            Op = ( FORMAT_CHARACTER ) ( ( ( unsigned char ) Op ) | 0x20 );
            }

        pParam = ( ( node_param* ) pAttributeNodeType )->GetCG();
        pSwitchNode = (CG_NDR*) pParam->GetChild();
        //
        // Get the actual base type if the attribute is a dereference.
        //
        if ( Op == FC_DEREFERENCE || Op == FC_SPLIT_DEREFERENCE )
            {
            pSwitchNode = (CG_NDR *) pSwitchNode->GetChild();
            }

        // Code the type of the size_is etc. expression.

        if ( pCommand->Is64BitEnv() )
            {
            if ( pSwitchNode->IsPointer() )
                {
                // iid_is
                Type |= FC_HYPER;
                }
            else
                {
                // Special treatment for __int3264.
                // hyper is here till the front end prevents it.

				// Note that to support __int3264 in sizing expressions etc., for robust
				// we would need to know the real size of memory variable.
				// Hence at that point we need a mapping from FC_*3264 to a type in <0..f>.
				// It looks like the only tokens that are left are these
				//     FC_INT3264 -> FC_WCHAR, 
				//	   FC_UINT3264 -> FC_FLOAT
				//     FC_UHYPER -> FC_DOUBLE
				// Please compare Xxx_Is_Type_OK in fldattr.cxx.

                FORMAT_CHARACTER  fc = ((CG_BASETYPE *)pSwitchNode)->GetSignedFormatChar();
        
                if ( fc == FC_INT3264  ||  fc == FC_UINT3264  ||  fc == FC_HYPER )
                    {
                    if ( fc == FC_INT3264 )
                        fc = FC_LONG;
                    else
                        fc = FC_ULONG;
                    }
                Type |= fc;
                }
            }
        else
            {
            if ( pSwitchNode->IsPointer() )
                {
                // iid_is
                Type |= FC_LONG;
                }
            else
                Type |= ((CG_BASETYPE *)pSwitchNode)->GetSignedFormatChar();
            }

        pFormatString->PushCorrelationTypeByte( Type );
        pFormatString->PushFormatChar( Op );

        if ( IsPointer && IsMultiDArray &&
             (pProc->GetOptimizationFlags() & OPTIMIZE_SIZE) )
            {
            CG_QUALIFIED_POINTER* pSizePointer = pCCB->GetCurrentSizePointer();
            pFormatString->PushShort( pSizePointer->GetDimension() ); 
            }
        else
            {
            CG_NDR* pOld = 0;
            if ( ( uConfFlags & FC_SPLIT_CORRELATION ) && pProc->IsFinishProc() )
                {
                pOld = pCCB->SetCGNodeContext( pProc->GetAsyncRelative() );
                }

            pFormatString->PushShortStackOffset( 
                            pParam->GetStackOffset( pCCB, I386_STACK_SIZING )
                            );
            if ( ( uConfFlags & FC_SPLIT_CORRELATION ) && pProc->IsFinishProc() )
                {
                pCCB->SetCGNodeContext( pOld );
                }
            }
        }
    else // structure cg class
        {
        CG_STRUCT *         pStruct;
        CG_FIELD *          pField;
        CG_ITERATOR         Iterator;
        CG_NDR*             pFirst = 0;
        CG_NDR*             pCurrentField = pCCB->GetLastPlaceholderClass();

        if ( IsPointer )
            Type = FC_POINTER_CONFORMANCE;
        else
            Type = FC_NORMAL_CONFORMANCE;

        pStruct = (CG_STRUCT *) pCCB->GetCGNodeContext();

        pStruct->GetMembers( Iterator );

        while ( ITERATOR_GETNEXT( Iterator, pField ) )
            {
            pSwitchNode = (CG_NDR *) pField->GetChild();

            if ( pCurrentField == pField )
                {
                if ( pFirst == 0 )
                    {
                    pFirst = pField;
                    uConfFlags = 0; // late correlation
                    }
                }

            if ( pField->GetType() == pAttributeNodeType  &&
                 ! pField->GetSizeIsDone() )
                {
                if ( pFirst == 0 )
                    {
                    pFirst = pField;
                    uConfFlags = FC_EARLY_CORRELATION; // early correlation
                    }
                pField->SetSizeIsDone( TRUE );

                //
                // Get the actual base type if the attribute is a dereference.
                //
                if ( Op == FC_DEREFERENCE )
                    pSwitchNode = (CG_NDR *) pSwitchNode->GetChild();

                // Code the type of the size etc. expression.

                if ( pSwitchNode->IsPointer() )
                    {
                    // Iid_is check.
                    //
                    if ( pCommand->Is64BitEnv() )
                        Type |= FC_HYPER;
                    else
                        Type |= FC_LONG;

                    break;
                    }

                if ( pCommand->Is64BitEnv() )
                    {
                    // Special treatment for __int3264.
                    // hyper is here till the front end prevents it.

                    FORMAT_CHARACTER  fc = ((CG_BASETYPE *)pSwitchNode)->GetSignedFormatChar();
        
                    if ( fc == FC_INT3264  ||  fc == FC_UINT3264  || fc == FC_HYPER )
                        {
                        if ( fc == FC_INT3264 )
                            fc = FC_LONG;
                        else
                            fc = FC_ULONG;
                        }
                    Type |= fc;
                    }
                else
                    Type |= ((CG_BASETYPE *)pSwitchNode)->GetSignedFormatChar();

                break;
                }
            }

            //
            // Offset to the attribute field in the structure.  Below are
            // the three possible ways to compute the offset, with the order
            // of precedence.
            //
            // For pointers (either sized pointers, or a pointer to a union)
            // this is a positive offset from the beginning of the structure.
            // For imbeded unions this is the offset from the union's position
            // in the structure to the attribute's position.
            // For conformant (varying) arrays it's a negative offset from the
            // end of the structure.
            //
            if ( IsPointer )
                Offset = pField->GetMemOffset();
            else
                {
                if ( IsUnion || IsVaryingArray )
                    {
                    CG_FIELD * pUnionField;

                    pUnionField = (CG_FIELD *) pCCB->GetLastPlaceholderClass();

                    Offset = pField->GetMemOffset() -
                             pUnionField->GetMemOffset();
                    }
                else
                    {
                    Offset = pField->GetMemOffset() -
                             pStruct->GetMemorySize();
                    }
                }

        pFormatString->PushCorrelationTypeByte( Type );
        pFormatString->PushFormatChar( Op );
        pFormatString->PushShort( Offset );
        }

    if ( fGenCorrelationDesc )
        {
        OUT_CORRELATION_DESC( pFormatString, uConfFlags );
        }

    return;

ComplexAttribute:

    char *      PrintPrefix = "";
    CG_NDR *    pNdr;

    pNdr = pCCB->GetCGNodeContext();

    //
    // If this is a top level attribute and we're compiling /Os then we 
    // don't need the callback since the expression is computed inline in 
    // the stub.
    //
    if ( pNdr->IsProc() &&
         (((CG_PROC *)pNdr)->GetOptimizationFlags() & OPTIMIZE_SIZE) )
        {
        pFormatString->PushCorrelationTypeByte( 
                IsMultiDArray ? 
                FC_TOP_LEVEL_MULTID_CONFORMANCE : FC_TOP_LEVEL_CONFORMANCE );
        pFormatString->PushByte( 0 );
        pFormatString->PushShort( (short) 0 );
        }
    else
        {
        long    Displacement;

        if ( pCCB->GetCGNodeContext()->IsProc() )
            Displacement = 0;
        else
            {
            CG_STRUCT *     pStruct;
            CG_FIELD *      pField;
            CG_NDR *        pNdr;

            // Get the imbeding struct.
            pStruct = (CG_STRUCT *) pCCB->GetCGNodeContext();

            // Get the field whose attribute we're handling.
            pField = (CG_FIELD *) pCCB->GetLastPlaceholderClass();

            //
            // Set the PrintPrefix string correctly.
            //
            PrintPrefix = pField->GetPrintPrefix();

            pNdr = (CG_NDR *) pField->GetChild();

            switch ( pNdr->GetCGID() )
                {
                case ID_CG_CONF_ARRAY :
                case ID_CG_CONF_VAR_ARRAY :
                case ID_CG_CONF_STRING_ARRAY :
                    // Displacement is imbeding struct's size.
                    Displacement = pStruct->GetMemorySize();
                    break;

                case ID_CG_VAR_ARRAY :
                case ID_CG_STRING_ARRAY :
                case ID_CG_ENCAP_STRUCT :
                case ID_CG_UNION :
                    // Displacement is imbeded node's offset in the struct.
                    Displacement = pField->GetMemOffset();
                    break;

                default :
                    Displacement = 0;
                    break;
                }
            }

        GenNdrFormatComplexAttributeDescription( pCCB,
                                                 pMinExpr,
                                                 pSizeExpr,
                                                 Displacement,
                                                 PrintPrefix,
                                                 IsPointer );
        }

    if ( fGenCorrelationDesc )
        {
        OUT_CORRELATION_DESC( pFormatString, uConfFlags );
        }

}


void
GenNdrFormatComplexAttributeDescription( CCB *          pCCB,
                                         expr_node *    pMinExpr,
                                         expr_node *    pSizeExpr,
                                         long           StackTopDisplacement,
                                         char *         PrintPrefix,
                                         BOOL           IsPointer )
/*++

Routine description:

    This routine generates
     - an auxuliary routine that evaluates a complicated expression.
     - a description of the callback call into the current code stream.

    The routine has the following signature:

        void  <name>( PMIDL_STUB_MESSAGE pStubMsg );

    The description is as follows (takes 4 bytes):

        0, FC_CALLBACK, <<routine_index>>

    The naming convention for the routine is currently as follows

        <name> is  <proc_or_struct_name>exprEval_<routine_index>

    Routine generation is postponed by using a Registry object.

Arguments:

    pCCB        - ptr to the code control block
    pMinExpr    - pointer to an expression tree, relates to min_is, first_is
    pSizeExpr   - pointer to an expression tree, relates to size_is, max_is etc.
    StackTopDisplacement    - For an attribute expression on a field in a 
                              a structure, this is the number of bytes to 
                              subtract from StackTop to get the proper 
                              structure pointer.
    PrinfPrefix - The prefix to print after "pS->" when accessing a field. 
    IsPointer   - Is this a description for an attribute on a pointer

    The interpretation of the two input expressions (pMinExpr and pSizeExpr)
    is such that when both of them are present, it is enough to take
    the difference to come up with the proper sizing.

    The algorithm used here is thus as follows:
        pMin    pSize

        NULL    NULL    impossible (assert)
        !=NULL  NULL    impossible (assert)

        NULL    !=NULL  Generate a routine that evaluates the following:
                          pStubMsg->Offset = 0
                          pStubMsg->MaxCount = eval(pSize)

        !=NULL  !=NULL  Generate a routine that evaluates the following:
                          pStubMsg->Offset = eval(pMin)
                          pStubMsg->MaxCount  = eval(pSize) - pStubMsg->Offset
Returns:


--*/
{
    MIDL_ASSERT( pSizeExpr != NULL );

    // Make the name of the routine and put it into the table.
    // Each call to the routine we are in right now will create a new entry
    // in the ExprEval routine table.

    CG_NDR *  pContainer = pCCB->GetCGNodeContext();
    unsigned short Index = (unsigned short)
                           (pCCB->GetExprEvalIndexMgr()->GetIndex() - 1);

    char * pContainerName = pContainer->GetType()->GetSymName();
    char * pName = new char[ strlen(pCCB->GetInterfaceName()) +
                             1 +  // "_"
                             strlen(pContainerName) +
                             sizeof("ExprEval_0000") + 1 ];
    strcpy( pName, pCCB->GetInterfaceName() );
    strcat( pName, "_" );
    strcat( pName, pContainerName );
    strcat( pName, "ExprEval_" );

    char * pBuf = pName + strlen(pName);
    sprintf( pBuf, "%04x", Index );

    pCCB->GetExprEvalIndexMgr()->Lookup( pName );

    // generate the description of the callback

    // If this is a top level attribute we note that in the description.
    if ( pCCB->GetCGNodeContext()->IsProc() )
        pCCB->GetFormatString()->PushCorrelationTypeByte(FC_TOP_LEVEL_CONFORMANCE);
    else
        if ( IsPointer ) 
            pCCB->GetFormatString()->PushCorrelationTypeByte(FC_POINTER_CONFORMANCE);
        else
            pCCB->GetFormatString()->PushCorrelationTypeByte(0);

    pCCB->GetFormatString()->PushFormatChar( FC_CALLBACK );
    pCCB->GetFormatString()->PushShort( (short) Index );

    // Register the routine to be generated for future use.

    EXPR_EVAL_CONTEXT * pExprEvalContext = new EXPR_EVAL_CONTEXT;
    pExprEvalContext->pContainer = pContainer;
    pExprEvalContext->pMinExpr = pMinExpr;
    pExprEvalContext->pSizeExpr = pSizeExpr;
    pExprEvalContext->pRoutineName = pName;
    pExprEvalContext->pPrintPrefix = PrintPrefix;
    pExprEvalContext->Displacement = StackTopDisplacement;

    pCCB->RegisterExprEvalRoutine( (node_skl *) pExprEvalContext );

}



void
CG_ARRAY::GenNdrCSArrayProlog( CCB * pCCB )
/*++

Routine description:

    Generate the format string for an array of international characters
    (if necessary).

Arguments:

    pCCB    - pointer to the code control block

Notes:

    This function also inserts the name of the user type and the name of the
    tag routines used (if any) into their respective lists so that the 
    prototypes can be emitted later.
   
    The FC_CSARRAY format:

        FC_CSARRAY
        FC_PAD
        reserved<2>                     // reserved
        element_size<2>                 // size of the user type
        index_of_cs_routines<2>         // offset of sizing/conversion routine
        offset_to_array_or_string<4>    // offset to the underlying type
        
--*/
{
    PNAME   pUserTypeName = GetCSUserTypeName();

    // If there's no CS user type name, this is not a cs array and we can quit.

    if ( ! pUserTypeName )
        return;

    FORMAT_STRING *pFormatString = pCCB->GetFormatString();
    short          TypeIndex = pCCB->GetCsTypeList().Insert( pUserTypeName );

    pFormatString->PushFormatChar( FC_CSARRAY );
    pFormatString->PushByte( 0 );
    pFormatString->PushShort( GetCSElementSize() );
    pFormatString->PushShort( TypeIndex );    
    pFormatString->PushShort( (short) 0 );      // reserved

    // Push the offset to the underlying array/string descriptor.  For now
    // it will always be immediately after the FC_CSARRAY so we can push a
    // constant value

    pFormatString->PushLong( 12 );
}