// Get number of generic parameters on a given type.
// Eg, for 'Foo<t, u>', returns 2.
// for 'Foo', returns 0.
public int CountGenericParams(int typeToken)
{
// This may fail in pre V2.0 debuggees.
//Guid IID_IMetadataImport2 = new Guid("FCE5EFA0-8BBA-4f8e-A036-8F2022B08466");
if (!(m_importer is IMetadataImport2))
{
return(0); // this means we're pre v2.0 debugees.
}
IMetadataImport2 importer2 = (m_importer as IMetadataImport2);
Debug.Assert(importer2 != null);
int dummy;
uint dummy2;
IntPtr hEnum = IntPtr.Zero;
int count;
importer2.EnumGenericParams(ref hEnum, typeToken, out dummy, 1, out dummy2);
try
{
m_importer.CountEnum(hEnum, out count);
}
finally
{
if (hEnum != IntPtr.Zero)
{
importer2.CloseEnum(hEnum);
}
}
return(count);
}
// Function translated directly from cor.h but never tested; included here in case someone wants to use it in future
/* internal static uint CorSigUncompressElementType(// return number of bytes of that compressed data occupied in pData
* IntPtr pData, // [IN] compressed data
* out CorElementType pElementType) // [OUT] the expanded *pData
* {
* unsafe
* {
* byte *pBytes = (byte*)pData;
* pElementType = (CorElementType)(*pBytes & 0x7f);
* return 1;
* }
* }*/
static internal string[] GetGenericArgumentNames(IMetadataImport importer,
int typeOrMethodToken)
{
IMetadataImport2 importer2 = (importer as IMetadataImport2);
if (importer2 == null)
{
return(new string[0]); // this means we're pre v2.0 debugees.
}
Debug.Assert(importer2 != null);
string[] genargs = null;
IntPtr hEnum = IntPtr.Zero;
try{
int i = 0;
do
{
uint nOut;
int genTypeToken;
importer2.EnumGenericParams(ref hEnum, typeOrMethodToken,
out genTypeToken, 1, out nOut);
if (genargs == null)
{
int count;
importer.CountEnum(hEnum, out count);
genargs = new string[count];
}
if (nOut == 0)
{
break;
}
Debug.Assert(nOut == 1);
if (nOut == 1)
{
uint genIndex;
int genFlags, ptkOwner, ptkKind;
ulong genArgNameSize;
importer2.GetGenericParamProps(genTypeToken,
out genIndex,
out genFlags,
out ptkOwner,
out ptkKind,
null,
0,
out genArgNameSize);
StringBuilder genArgName = new StringBuilder((int)genArgNameSize);
importer2.GetGenericParamProps(genTypeToken,
out genIndex,
out genFlags,
out ptkOwner,
out ptkKind,
genArgName,
(ulong)genArgName.Capacity,
out genArgNameSize);
genargs[i] = genArgName.ToString();
}
++i;
} while(i < genargs.Length);
}
finally
{
if (hEnum != IntPtr.Zero)
{
importer2.CloseEnum(hEnum);
}
}
return(genargs);
}