protected override void AnalyzeNode()

in ClrHeapAllocationsAnalyzer/CallSiteImplicitAllocationAnalyzer.cs [25:67]
31 lines of code
8 McCabe index (conditional complexity)

        protected override void AnalyzeNode(SyntaxNodeAnalysisContext context)
        {
            var node = context.Node;
            var semanticModel = context.SemanticModel;
            Action<Diagnostic> reportDiagnostic = context.ReportDiagnostic;
            var cancellationToken = context.CancellationToken;
            string filePath = node.SyntaxTree.FilePath;

            if (semanticModel.GetOperation(node, cancellationToken) is not IInvocationOperation invocationOperation)
            {
                return;
            }

            var targetMethod = invocationOperation.TargetMethod;

            if (targetMethod.IsOverride)
            {
                CheckNonOverridenMethodOnStruct(targetMethod, reportDiagnostic, node, filePath);
            }

            bool compilationHasSystemArrayEmpty = !semanticModel.Compilation.GetSpecialType(SpecialType.System_Array).GetMembers("Empty").IsEmpty;

            // Loop on every argument because params argument may not be the last one.
            //     static void Fun1() => Fun2(args: "", i: 5);
            //     static void Fun2(int i = 0, params object[] args) {}
            foreach (var argument in invocationOperation.Arguments)
            {
                if (argument.ArgumentKind != ArgumentKind.ParamArray)
                {
                    continue;
                }

                bool isEmpty = (argument.Value as IArrayCreationOperation)?.Initializer.ElementValues.IsEmpty == true;

                // Up to net45 the System.Array.Empty<T> singleton didn't existed so an empty params array was still causing some memory allocation.
                if (argument.IsImplicit && (!isEmpty || !compilationHasSystemArrayEmpty))
                {
                    reportDiagnostic(Diagnostic.Create(ParamsParameterRule, node.GetLocation(), EmptyMessageArgs));
                }

                break;
            }
        }