//*****************************************************************************
// Implementation of IMetaDataImport::ResolveTypeRef to resolve a typeref across scopes.
//
// Arguments:
// tr - typeref within this scope to resolve
// riid - interface on ppIScope to support
// ppIScope - out-parameter to get metadata scope for typedef (*ptd)
// ptd - out-parameter to get typedef that the ref resolves to.
//
// Notes:
// TypeDefs define a type within a scope. TypeRefs refer to type-defs in other scopes
// and allow you to import a type from another scope. This function attempts to determine
// which type-def a type-ref points to.
//
// This resolve (type-ref, this cope) --> (type-def=*ptd, other scope=*ppIScope)
//
// However, this resolution requires knowing what modules have been loaded, which is not decided
// until runtime via loader / fusion policy. Thus this interface can't possibly be correct since
// it doesn't have that knowledge. Furthermore, when inspecting metadata from another process
// (such as a debugger inspecting the debuggee's metadata), this API can be truly misleading.
//
// This API usage should be avoided.
//
//*****************************************************************************
STDMETHODIMP
RegMeta::ResolveTypeRef(
mdTypeRef tr,
REFIID riid,
IUnknown ** ppIScope,
mdTypeDef * ptd)
{
#ifdef FEATURE_METADATA_IN_VM
HRESULT hr;
BEGIN_ENTRYPOINT_NOTHROW;
TypeRefRec * pTypeRefRec;
WCHAR wzNameSpace[_MAX_PATH];
CMiniMdRW * pMiniMd = NULL;
LOG((LOGMD, "{%08x} RegMeta::ResolveTypeRef(0x%08x, 0x%08x, 0x%08x, 0x%08x)\n",
this, tr, riid, ppIScope, ptd));
START_MD_PERF();
LOCKREAD();
pMiniMd = &(m_pStgdb->m_MiniMd);
_ASSERTE((ppIScope != NULL) && (ptd != NULL));
// Init the output values.
*ppIScope = NULL;
*ptd = 0;
if (IsNilToken(tr))
{
if (ptd != NULL)
{
*ptd = mdTypeDefNil;
}
if (ppIScope != NULL)
{
*ppIScope = NULL;
}
STOP_MD_PERF(ResolveTypeRef);
hr = E_INVALIDARG;
goto ErrExit;
}
if (TypeFromToken(tr) == mdtTypeDef)
{
// Shortcut when we receive a TypeDef token
*ptd = tr;
STOP_MD_PERF(ResolveTypeRef);
hr = this->QueryInterface(riid, (void **)ppIScope);
goto ErrExit;
}
// Get the class ref row.
_ASSERTE(TypeFromToken(tr) == mdtTypeRef);
IfFailGo(pMiniMd->GetTypeRefRecord(RidFromToken(tr), &pTypeRefRec));
IfFailGo(pMiniMd->getNamespaceOfTypeRef(pTypeRefRec, wzNameSpace, lengthof(wzNameSpace), NULL));
if (hr != NOERROR)
{
_ASSERTE(hr == CLDB_S_TRUNCATION);
// Truncate the namespace string
wzNameSpace[lengthof(wzNameSpace) - 1] = 0;
}
//***********************
// before we go off to CORPATH, check the loaded modules!
//***********************
if (LOADEDMODULES::ResolveTypeRefWithLoadedModules(
tr,
this,
pMiniMd,
riid,
ppIScope,
ptd) == NOERROR)
{
// Done!! We found one match among the loaded modules.
goto ErrExit;
}
IfFailGo(META_E_CANNOTRESOLVETYPEREF);
ErrExit:
STOP_MD_PERF(ResolveTypeRef);
END_ENTRYPOINT_NOTHROW;
return hr;
#else // FEATURE_METADATA_IN_VM
return E_NOTIMPL;
#endif // FEATURE_METADATA_IN_VM
} // RegMeta::ResolveTypeRef
