public string MakeWrapperBody(MethodDefinition def, bool isFactoryMethod)
{
var rawName = RawName;
bool isGetMany = GetManyParameterName != null;
var getManyPname = GetManyParameterName;
var output = Output;
var rawParams = new List <string> {
"self.get_abi() as *const _ as *mut _"
};
foreach (var p in def.Parameters)
{
var pname = NameHelpers.PreventKeywords(NameHelpers.FirstToLower(p.Name));
if (p.ParameterType.IsByReference)
{
if (((ByReferenceType)p.ParameterType).ElementType.IsArray)
{
rawParams.Add("&mut " + pname + "Size");
}
// output parameter
rawParams.Add("&mut " + pname);
}
else
{
// input parameter
if (p.ParameterType.IsArray)
{
if (p.IsOut)
{
if (isGetMany)
{
rawParams.Add(pname + ".capacity() as u32");
rawParams.Add(pname + ".as_mut_ptr() as *mut T::Abi");
}
else
{
rawParams.Add(pname + ".len() as u32");
rawParams.Add(pname + ".as_mut_ptr() as *mut _");
}
}
else
{
rawParams.Add(pname + ".len() as u32");
rawParams.Add(pname + ".as_ptr() as *mut _");
}
}
else
{
rawParams.Add(TypeHelpers.UnwrapInputParameter(pname, p.ParameterType));
}
}
}
if (def.ReturnType.FullName != "System.Void")
{
if (def.ReturnType.IsArray)
{
rawParams.Add("&mut outSize");
}
rawParams.Add("&mut out");
}
var outInit = String.Join(" ", output.SelectMany(o => TypeHelpers.CreateUninitializedOutputs(o.Item1, o.Item2)));
if (outInit != "")
{
outInit = "\r\n " + outInit;
}
var outWrap = String.Join(", ", output.Zip(GeneratedOutTypes, (a, b) => Tuple.Create(a.Item1, a.Item2, a.Item3, b)).Select(o => TypeHelpers.WrapOutputParameter(o.Item1, o.Item2, isFactoryMethod || o.Item3, o.Item4)));
if (output.Count != 1)
{
outWrap = "(" + outWrap + ")"; // also works for count == 0 (empty tuple)
}
outWrap = "Ok(" + outWrap + ")";
if (isGetMany)
{
outInit = $"\r\n debug_assert!({ getManyPname }.capacity() > 0, \"capacity of `{ getManyPname }` must not be 0 (use Vec::with_capacity)\"); { getManyPname }.clear();{ outInit }";
outWrap = $"{ getManyPname }.set_len(out as usize); Ok(())";
}
return(outInit + $@"
let hr = (self.get_vtbl().{ rawName })({ String.Join(", ", rawParams) });
if hr == S_OK {{ { outWrap } }} else {{ err(hr) }}");
}
private MethodDetailsCache InitializeDetailsCache()
{
string rawName = GetRawName();
string name = GetWrapperName(rawName);
bool isGetMany = (rawName == "GetMany" && DeclaringType.Namespace == "Windows.Foundation.Collections" &&
(DeclaringType.Name == "IVectorView`1" || DeclaringType.Name == "IIterator`1" || DeclaringType.Name == "IVector`1"));
string getManyPname = null;
// These `GetMany` methods have special semantics, since it takes an array and returns the number of elements that were filled
// It uses the __RPC__out_ecount_part(capacity, *actual) annotation in the C headers. For the wrapper we use a &mut Vec<> buffer.
var input = new List <Tuple <string, TypeReference, InputKind> >();
var output = new List <Tuple <string, TypeReference, bool> >();
foreach (var p in Method.Parameters)
{
string pname = NameHelpers.PreventKeywords(NameHelpers.FirstToLower(p.Name));
if (p.ParameterType.IsByReference)
{
Assert(p.IsOut);
var realType = ((ByReferenceType)p.ParameterType).ElementType;
output.Add(Tuple.Create(pname, realType, false));
}
else
{
if (p.ParameterType.IsArray)
{
if (p.IsOut)
{
if (isGetMany)
{
Assert(getManyPname == null); // there should only be one out-array parameter for GetMany
getManyPname = pname;
input.Add(Tuple.Create(pname, ((ArrayType)p.ParameterType).ElementType, InputKind.VecBuffer));
}
else
{
input.Add(Tuple.Create(pname, ((ArrayType)p.ParameterType).ElementType, InputKind.MutSlice));
}
}
else
{
input.Add(Tuple.Create(pname, ((ArrayType)p.ParameterType).ElementType, InputKind.Slice));
}
}
else
{
input.Add(Tuple.Create(pname, p.ParameterType, InputKind.Default));
}
}
}
if (Method.ReturnType.FullName != "System.Void")
{
// this makes the actual return value the last in the tuple (if multiple)
output.Add(Tuple.Create("out", Method.ReturnType, TypeHelpers.IsReturnTypeNonNull(Method.ReturnType, DeclaringType.Generator)));
}
// TODO: second tuple element should be true for some method's return value
var outTypes = output.Select(o => Tuple.Create(o.Item2, o.Item3)).ToArray();
if (isGetMany)
{
outTypes = new Tuple <TypeReference, bool>[] { }; // GetMany has no return value
}
return(new MethodDetailsCache
{
WrappedName = name,
RawName = rawName,
InputParameterNames = input.Select(i => i.Item1).ToArray(),
InputParameterTypes = input.Select(i => Tuple.Create(i.Item2, i.Item3)).ToArray(),
OutTypes = outTypes.ToArray(),
GetManyParameterName = isGetMany ? getManyPname : null,
Output = output
});
}
public IEnumerable <string> GetParameterDeclarations()
{
yield return("&self");
foreach (var p in Method.Parameters)
{
Assert(!p.IsReturnValue);
int?lengthIs = null;
var lengthIsAttribute = p.CustomAttributes.SingleOrDefault(a => a.AttributeType.Name == "LengthIsAttribute");
if (lengthIsAttribute != null)
{
lengthIs = (int)lengthIsAttribute.ConstructorArguments[0].Value;
}
if (p.ParameterType.IsArray)
{
// need additional input size parameter (even if parameter is marked as [Out])
yield return(NameHelpers.FirstToLower(p.Name) + "Size: u32");
}
else if (p.ParameterType.IsByReference && (p.ParameterType as ByReferenceType).ElementType.IsArray)
{
Assert(!lengthIs.HasValue);
// need additional output size parameter
yield return(NameHelpers.FirstToLower(p.Name) + "Size: *mut u32");
}
yield return(NameHelpers.PreventKeywords(NameHelpers.FirstToLower(p.Name)) + ": " + TypeHelpers.GetTypeName(DeclaringType.Generator, this, p.ParameterType, TypeUsage.Raw));
}
if (Method.ReturnType.FullName != "System.Void")
{
if (Method.ReturnType.IsArray)
{
yield return("outSize: *mut u32");
}
yield return("out: *mut " + TypeHelpers.GetTypeName(DeclaringType.Generator, this, Method.ReturnType, TypeUsage.Raw));
}
}
public string[] MakeInputParameters(Generator generator, ITypeRequestSource source)
{
return(InputParameterNames.Zip(InputParameterTypes, (name, t) => name + ": " + TypeHelpers.GetInputTypeName(generator, source, t.Item1, t.Item2)).ToArray());
}