public static int GetHashCodeFor(TypeReference obj)
{
// a very good prime number
const int hashCodeMultiplier = 486187739;
// prime numbers
const int genericInstanceTypeMultiplier = 31;
const int byReferenceMultiplier = 37;
const int pointerMultiplier = 41;
const int requiredModifierMultiplier = 43;
const int optionalModifierMultiplier = 47;
const int pinnedMultiplier = 53;
const int sentinelMultiplier = 59;
MetadataType metadataType = obj.MetadataType;
if (metadataType == MetadataType.GenericInstance)
{
GenericInstanceType genericInstanceType = (GenericInstanceType)obj;
int hashCode = GetHashCodeFor(genericInstanceType.ElementType) * hashCodeMultiplier + genericInstanceTypeMultiplier;
for (int i = 0; i < genericInstanceType.GenericArguments.Count; i++)
{
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor(genericInstanceType.GenericArguments[i]);
}
return(hashCode);
}
if (metadataType == MetadataType.Array)
{
ArrayType arrayType = (ArrayType)obj;
return(GetHashCodeFor(arrayType.ElementType) * hashCodeMultiplier + arrayType.Rank.GetHashCode());
}
if (metadataType == MetadataType.Var || metadataType == MetadataType.MVar)
{
GenericParameter genericParameter = (GenericParameter)obj;
int hashCode = genericParameter.Position.GetHashCode() * hashCodeMultiplier + ((int)metadataType).GetHashCode();
TypeReference ownerTypeReference = genericParameter.Owner as TypeReference;
if (ownerTypeReference != null)
{
return(hashCode * hashCodeMultiplier + GetHashCodeFor(ownerTypeReference));
}
MethodReference ownerMethodReference = genericParameter.Owner as MethodReference;
if (ownerMethodReference != null)
{
return(hashCode * hashCodeMultiplier + MethodReferenceComparer.GetHashCodeFor(ownerMethodReference));
}
throw new InvalidOperationException("Generic parameter encountered with invalid owner");
}
if (metadataType == MetadataType.ByReference)
{
ByReferenceType byReferenceType = (ByReferenceType)obj;
return(GetHashCodeFor(byReferenceType.ElementType) * hashCodeMultiplier * byReferenceMultiplier);
}
if (metadataType == MetadataType.Pointer)
{
PointerType pointerType = (PointerType)obj;
return(GetHashCodeFor(pointerType.ElementType) * hashCodeMultiplier * pointerMultiplier);
}
if (metadataType == MetadataType.RequiredModifier)
{
RequiredModifierType requiredModifierType = (RequiredModifierType)obj;
int hashCode = GetHashCodeFor(requiredModifierType.ElementType) * requiredModifierMultiplier;
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor(requiredModifierType.ModifierType);
return(hashCode);
}
if (metadataType == MetadataType.OptionalModifier)
{
OptionalModifierType optionalModifierType = (OptionalModifierType)obj;
int hashCode = GetHashCodeFor(optionalModifierType.ElementType) * optionalModifierMultiplier;
hashCode = hashCode * hashCodeMultiplier + GetHashCodeFor(optionalModifierType.ModifierType);
return(hashCode);
}
if (metadataType == MetadataType.Pinned)
{
PinnedType pinnedType = (PinnedType)obj;
return(GetHashCodeFor(pinnedType.ElementType) * hashCodeMultiplier * pinnedMultiplier);
}
if (metadataType == MetadataType.Sentinel)
{
SentinelType sentinelType = (SentinelType)obj;
return(GetHashCodeFor(sentinelType.ElementType) * hashCodeMultiplier * sentinelMultiplier);
}
if (metadataType == MetadataType.FunctionPointer)
{
throw new NotImplementedException("We currently don't handle function pointer types.");
}
return(obj.Namespace.GetHashCode() * hashCodeMultiplier + obj.FullName.GetHashCode());
}
private static bool ContainsGenericParameters(TypeReference typeReference)
{
GenericParameter genericParameter = typeReference as GenericParameter;
if (genericParameter != null)
{
return(true);
}
ArrayType arrayType = typeReference as ArrayType;
if (arrayType != null)
{
return(ContainsGenericParameters(arrayType.ElementType));
}
PointerType pointerType = typeReference as PointerType;
if (pointerType != null)
{
return(ContainsGenericParameters(pointerType.ElementType));
}
ByReferenceType byRefType = typeReference as ByReferenceType;
if (byRefType != null)
{
return(ContainsGenericParameters(byRefType.ElementType));
}
SentinelType sentinelType = typeReference as SentinelType;
if (sentinelType != null)
{
return(ContainsGenericParameters(sentinelType.ElementType));
}
PinnedType pinnedType = typeReference as PinnedType;
if (pinnedType != null)
{
return(ContainsGenericParameters(pinnedType.ElementType));
}
RequiredModifierType requiredModifierType = typeReference as RequiredModifierType;
if (requiredModifierType != null)
{
return(ContainsGenericParameters(requiredModifierType.ElementType));
}
GenericInstanceType genericInstance = typeReference as GenericInstanceType;
if (genericInstance != null)
{
foreach (TypeReference genericArgument in genericInstance.GenericArguments)
{
if (ContainsGenericParameters(genericArgument))
{
return(true);
}
}
return(false);
}
if (typeReference is TypeSpecification)
{
throw new NotSupportedException();
}
return(false);
}