StorageDescriptor.cs

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using System.Reflection;
using System.Reflection.Emit;
 
namespace System.Xml.Xsl.IlGen;
 
internal struct StorageDescriptor
{
    private ItemLocation _location;
 
    private object _locationObject;
 
    private Type _itemStorageType;
 
    private bool _isCached;
 
    public ItemLocation Location => _location;
 
    public int ParameterLocation => (int)_locationObject;
 
    public LocalBuilder LocalLocation => _locationObject as LocalBuilder;
 
    public CurrentContext CurrentLocation => _locationObject as CurrentContext;
 
    public MethodInfo GlobalLocation => _locationObject as MethodInfo;
 
    public bool IsCached => _isCached;
 
    public Type ItemStorageType => _itemStorageType;
 
    public static StorageDescriptor None()
    {
        return default(StorageDescriptor);
    }
 
    public static StorageDescriptor Stack(Type itemStorageType, bool isCached)
    {
        StorageDescriptor result = default(StorageDescriptor);
        result._location = ItemLocation.Stack;
        result._itemStorageType = itemStorageType;
        result._isCached = isCached;
        return result;
    }
 
    public static StorageDescriptor Parameter(int paramIndex, Type itemStorageType, bool isCached)
    {
        StorageDescriptor result = default(StorageDescriptor);
        result._location = ItemLocation.Parameter;
        result._locationObject = paramIndex;
        result._itemStorageType = itemStorageType;
        result._isCached = isCached;
        return result;
    }
 
    public static StorageDescriptor Local(LocalBuilder loc, Type itemStorageType, bool isCached)
    {
        StorageDescriptor result = default(StorageDescriptor);
        result._location = ItemLocation.Local;
        result._locationObject = loc;
        result._itemStorageType = itemStorageType;
        result._isCached = isCached;
        return result;
    }
 
    public static StorageDescriptor Current(LocalBuilder locIter, MethodInfo currentMethod, Type itemStorageType)
    {
        StorageDescriptor result = default(StorageDescriptor);
        result._location = ItemLocation.Current;
        result._locationObject = new CurrentContext(locIter, currentMethod);
        result._itemStorageType = itemStorageType;
        return result;
    }
 
    public static StorageDescriptor Global(MethodInfo methGlobal, Type itemStorageType, bool isCached)
    {
        StorageDescriptor result = default(StorageDescriptor);
        result._location = ItemLocation.Global;
        result._locationObject = methGlobal;
        result._itemStorageType = itemStorageType;
        result._isCached = isCached;
        return result;
    }
 
    public StorageDescriptor ToStack()
    {
        return Stack(_itemStorageType, _isCached);
    }
 
    public StorageDescriptor ToLocal(LocalBuilder loc)
    {
        return Local(loc, _itemStorageType, _isCached);
    }
 
    public StorageDescriptor ToStorageType(Type itemStorageType)
    {
        StorageDescriptor result = this;
        result._itemStorageType = itemStorageType;
        return result;
    }
}