STDMETHODIMP RegMeta::EnumGenericParams(HCORENUM *phEnum, mdToken tkOwner,
mdGenericParam rTokens[], ULONG cMaxTokens, ULONG *pcTokens)
{
HRESULT hr = S_OK;
BEGIN_ENTRYPOINT_NOTHROW;
HENUMInternal **ppmdEnum = reinterpret_cast<HENUMInternal **> (phEnum);
ULONG ridStart;
ULONG ridEnd;
HENUMInternal *pEnum;
GenericParamRec *pRec;
ULONG index;
CMiniMdRW *pMiniMd = NULL;
LOG((LOGMD, "RegMeta::EnumGenericParams(0x%08x, 0x%08x, 0x%08x, 0x%08x, 0x%08x)\n",
phEnum, tkOwner, rTokens, cMaxTokens, pcTokens));
START_MD_PERF();
LOCKREAD();
pMiniMd = &(m_pStgdb->m_MiniMd);
// See if this version of the metadata can do Generics
if (!pMiniMd->SupportsGenerics())
{
if (pcTokens)
*pcTokens = 0;
hr = S_FALSE;
goto ErrExit;
}
_ASSERTE(TypeFromToken(tkOwner) == mdtTypeDef || TypeFromToken(tkOwner) == mdtMethodDef);
if ( *ppmdEnum == 0 )
{
// instantiating a new ENUM
//@todo GENERICS: review this. Are we expecting a sorted table or not?
if ( pMiniMd->IsSorted( TBL_GenericParam ) )
{
if (TypeFromToken(tkOwner) == mdtTypeDef)
{
IfFailGo(pMiniMd->getGenericParamsForTypeDef(RidFromToken(tkOwner), &ridEnd, &ridStart));
}
else
{
IfFailGo(pMiniMd->getGenericParamsForMethodDef(RidFromToken(tkOwner), &ridEnd, &ridStart));
}
IfFailGo( HENUMInternal::CreateSimpleEnum(mdtGenericParam, ridStart, ridEnd, &pEnum) );
}
else
{
// table is not sorted so we have to create dynamic array
// create the dynamic enumerator
//
ridStart = 1;
ridEnd = pMiniMd->getCountGenericParams() + 1;
IfFailGo( HENUMInternal::CreateDynamicArrayEnum(mdtGenericParam, &pEnum) );
for (index = ridStart; index < ridEnd; index ++ )
{
IfFailGo(pMiniMd->GetGenericParamRecord(index, &pRec));
if ( tkOwner == pMiniMd->getOwnerOfGenericParam(pRec) )
{
IfFailGo( HENUMInternal::AddElementToEnum(pEnum, TokenFromRid(index, mdtGenericParam) ) );
}
}
}
// set the output parameter
*ppmdEnum = pEnum;
}
else
{
pEnum = *ppmdEnum;
}
// fill the output token buffer
hr = HENUMInternal::EnumWithCount(pEnum, cMaxTokens, rTokens, pcTokens);
ErrExit:
HENUMInternal::DestroyEnumIfEmpty(ppmdEnum);
STOP_MD_PERF(EnumGenericPars);
END_ENTRYPOINT_NOTHROW;
return hr;
} // RegMeta::EnumGenericParams
