private FunctionPointerTypeSymbol SubstituteFunctionPointerType(FunctionPointerTypeSymbol f)
{
var substitutedReturnType = f.Signature.ReturnTypeWithAnnotations.SubstituteType(this);
var refCustomModifiers = f.Signature.RefCustomModifiers;
var substitutedRefCustomModifiers = SubstituteCustomModifiers(refCustomModifiers);
var parameterTypesWithAnnotations = f.Signature.ParameterTypesWithAnnotations;
ImmutableArray <TypeWithAnnotations> substitutedParamTypes = SubstituteTypes(
parameterTypesWithAnnotations
);
ImmutableArray <ImmutableArray <CustomModifier> > substitutedParamModifiers = default;
var paramCount = f.Signature.Parameters.Length;
if (paramCount > 0)
{
var builder = ArrayBuilder <ImmutableArray <CustomModifier> > .GetInstance(paramCount);
bool didSubstitute = false;
foreach (var param in f.Signature.Parameters)
{
var substituted = SubstituteCustomModifiers(param.RefCustomModifiers);
builder.Add(substituted);
if (substituted != param.RefCustomModifiers)
{
didSubstitute = true;
}
}
if (didSubstitute)
{
substitutedParamModifiers = builder.ToImmutableAndFree();
}
else
{
builder.Free();
}
}
if (
substitutedParamTypes != parameterTypesWithAnnotations ||
!substitutedParamModifiers.IsDefault ||
!f.Signature.ReturnTypeWithAnnotations.IsSameAs(substitutedReturnType) ||
substitutedRefCustomModifiers != refCustomModifiers
)
{
f = f.SubstituteTypeSymbol(
substitutedReturnType,
substitutedParamTypes,
refCustomModifiers,
substitutedParamModifiers
);
}
return(f);
}
