ActivationAttributeStack.cs

namespace System.Runtime.Remoting.Activation
{
    internal class ActivationAttributeStack
    {
        private object[] activationTypes;

        private object[] activationAttributes;

        private int freeIndex;

        internal ActivationAttributeStack()
        {
            activationTypes = new object[4];
            activationAttributes = new object[4];
            freeIndex = 0;
        }

        internal void Push(Type typ, object[] attr)
        {
            if (freeIndex == activationTypes.Length)
            {
                object[] destinationArray = new object[activationTypes.Length * 2];
                object[] destinationArray2 = new object[activationAttributes.Length * 2];
                Array.Copy(activationTypes, destinationArray, activationTypes.Length);
                Array.Copy(activationAttributes, destinationArray2, activationAttributes.Length);
                activationTypes = destinationArray;
                activationAttributes = destinationArray2;
            }
            activationTypes[freeIndex] = typ;
            activationAttributes[freeIndex] = attr;
            freeIndex++;
        }

        internal object[] Peek(Type typ)
        {
            if (freeIndex == 0 || activationTypes[freeIndex - 1] != typ)
            {
                return null;
            }
            return (object[])activationAttributes[freeIndex - 1];
        }

        internal void Pop(Type typ)
        {
            if (freeIndex != 0 && activationTypes[freeIndex - 1] == typ)
            {
                freeIndex--;
                activationTypes[freeIndex] = null;
                activationAttributes[freeIndex] = null;
            }
        }
    }
}