/// <summary>
/// Resolves an invocation.
/// </summary>
/// <param name="target">The target of the invocation. Usually a MethodGroupResolveResult.</param>
/// <param name="arguments">
/// Arguments passed to the method.
/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
/// </param>
/// <param name="argumentNames">
/// The argument names. Pass the null string for positional arguments.
/// </param>
/// <returns>InvocationResolveResult or UnknownMethodResolveResult</returns>
public ResolveResult ResolveInvocation(ResolveResult target, ResolveResult[] arguments, string[] argumentNames = null)
{
// C# 4.0 spec: §7.6.5
if (target.Type.Kind == TypeKind.Dynamic)
return DynamicResult;
MethodGroupResolveResult mgrr = target as MethodGroupResolveResult;
if (mgrr != null) {
OverloadResolution or = mgrr.PerformOverloadResolution(compilation, arguments, argumentNames, conversions: conversions);
if (or.BestCandidate != null) {
return or.CreateResolveResult(mgrr.TargetResult);
} else {
// No candidate found at all (not even an inapplicable one).
// This can happen with empty method groups (as sometimes used with extension methods)
return new UnknownMethodResolveResult(
mgrr.TargetType, mgrr.MethodName, mgrr.TypeArguments, CreateParameters(arguments, argumentNames));
}
}
UnknownMemberResolveResult umrr = target as UnknownMemberResolveResult;
if (umrr != null) {
return new UnknownMethodResolveResult(umrr.TargetType, umrr.MemberName, umrr.TypeArguments, CreateParameters(arguments, argumentNames));
}
UnknownIdentifierResolveResult uirr = target as UnknownIdentifierResolveResult;
if (uirr != null && CurrentTypeDefinition != null) {
return new UnknownMethodResolveResult(CurrentTypeDefinition, uirr.Identifier, EmptyList<IType>.Instance, CreateParameters(arguments, argumentNames));
}
IMethod invokeMethod = target.Type.GetDelegateInvokeMethod();
if (invokeMethod != null) {
OverloadResolution or = new OverloadResolution(compilation, arguments, argumentNames, conversions: conversions);
or.AddCandidate(invokeMethod);
return new CppInvocationResolveResult(
target, invokeMethod, //invokeMethod.ReturnType.Resolve(context),
or.GetArgumentsWithConversions(), or.BestCandidateErrors,
isExpandedForm: or.BestCandidateIsExpandedForm,
isDelegateInvocation: true,
argumentToParameterMap: or.GetArgumentToParameterMap());
}
return ErrorResult;
}
ResolveResult CreateResolveResultForUserDefinedOperator(OverloadResolution r, System.Linq.Expressions.ExpressionType operatorType)
{
if (r.BestCandidateErrors != OverloadResolutionErrors.None)
return r.CreateResolveResult(null);
IMethod method = (IMethod)r.BestCandidate;
return new OperatorResolveResult(method.ReturnType, operatorType, method,
isLiftedOperator: method is OverloadResolution.ILiftedOperator,
operands: r.GetArgumentsWithConversions());
}