Jurassic.Compiler.DynamicILGenerator.BeginCatchBlock C# (CSharp) Method

        public override void BeginCatchBlock(Type exceptionType)
        {
            if (exceptionType == null)
                throw new ArgumentNullException("exceptionType");
            if (this.activeExceptionRegions == null || this.activeExceptionRegions.Count == 0)
                throw new InvalidOperationException("BeginExceptionBlock() must have been called before calling this method.");

            // Get a token for the exception type.
            var exceptionTypeToken = this.GetToken(exceptionType);

            // Get the top-most exception region.
            var exceptionRegion = this.activeExceptionRegions.Peek();

            // Check there isn't already a catch block with the same type.
            foreach (var clause in exceptionRegion.Clauses)
                if (clause.Type == ExceptionClauseType.Catch && clause.CatchToken == exceptionTypeToken)
                    throw new InvalidOperationException("Multiple catch clauses with the same type are not allowed.");

            // Close off the current exception clause.
            EndCurrentClause(exceptionRegion);

            // Add a new finally clause.
            exceptionRegion.Clauses.Add(new ExceptionClause() { Type = ExceptionClauseType.Catch, ILStart = this.offset, CatchToken = exceptionTypeToken });

            // The evaluation stack starts with the exception on the top of the stack.
            ReplaceEvaluationStack(VESType.Object);
        }