internal static (IType, IParameter[]) DecodeSignature(MetadataModule module, IParameterizedMember owner, MethodSignature <IType> signature, ParameterHandleCollection?parameterHandles)
{
var metadata = module.metadata;
int i = 0;
CustomAttributeHandleCollection?returnTypeAttributes = null;
IParameter[] parameters = new IParameter[signature.RequiredParameterCount
+ (signature.Header.CallingConvention == SignatureCallingConvention.VarArgs ? 1 : 0)];
IType parameterType;
if (parameterHandles != null)
{
foreach (var parameterHandle in parameterHandles)
{
var par = metadata.GetParameter(parameterHandle);
if (par.SequenceNumber == 0)
{
// "parameter" holds return type attributes
returnTypeAttributes = par.GetCustomAttributes();
}
else if (par.SequenceNumber > 0 && i < signature.RequiredParameterCount)
{
// "Successive rows of the Param table that are owned by the same method shall be
// ordered by increasing Sequence value - although gaps in the sequence are allowed"
Debug.Assert(i < par.SequenceNumber);
// Fill gaps in the sequence with non-metadata parameters:
while (i < par.SequenceNumber - 1)
{
parameterType = ApplyAttributeTypeVisitor.ApplyAttributesToType(
signature.ParameterTypes[i], module.Compilation, null, metadata, module.TypeSystemOptions);
parameters[i] = new DefaultParameter(parameterType, name: string.Empty, owner,
isRef: parameterType.Kind == TypeKind.ByReference);
i++;
}
parameterType = ApplyAttributeTypeVisitor.ApplyAttributesToType(
signature.ParameterTypes[i], module.Compilation,
par.GetCustomAttributes(), metadata, module.TypeSystemOptions);
parameters[i] = new MetadataParameter(module, owner, parameterType, parameterHandle);
i++;
}
}
}
while (i < signature.RequiredParameterCount)
{
parameterType = ApplyAttributeTypeVisitor.ApplyAttributesToType(
signature.ParameterTypes[i], module.Compilation, null, metadata, module.TypeSystemOptions);
parameters[i] = new DefaultParameter(parameterType, name: string.Empty, owner,
isRef: parameterType.Kind == TypeKind.ByReference);
i++;
}
if (signature.Header.CallingConvention == SignatureCallingConvention.VarArgs)
{
parameters[i] = new DefaultParameter(SpecialType.ArgList, name: string.Empty, owner);
i++;
}
Debug.Assert(i == parameters.Length);
var returnType = ApplyAttributeTypeVisitor.ApplyAttributesToType(signature.ReturnType,
module.Compilation, returnTypeAttributes, metadata, module.TypeSystemOptions);
return(returnType, parameters);
}
public override string ToString()
{
return(DefaultParameter.ToString(this));
}
public override string ToString()
{
return($"{MetadataTokens.GetToken(handle):X8} {DefaultParameter.ToString(this)}");
}
