LocalScope.cs

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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Reflection.Emit;
 
namespace System.Xml.Serialization;
 
internal sealed class LocalScope
{
    public readonly LocalScope parent;
 
    private readonly Dictionary<string, LocalBuilder> _locals;
 
    public LocalBuilder this[string key]
    {
        get
        {
            TryGetValue(key, out var value);
            return value;
        }
        [param: DisallowNull]
        set
        {
            _locals[key] = value;
        }
    }
 
    public LocalScope()
    {
        _locals = new Dictionary<string, LocalBuilder>();
    }
 
    public LocalScope(LocalScope parent)
        : this()
    {
        this.parent = parent;
    }
 
    public bool TryGetValue(string key, [NotNullWhen(true)] out LocalBuilder value)
    {
        if (_locals.TryGetValue(key, out value))
        {
            return true;
        }
        if (parent != null)
        {
            return parent.TryGetValue(key, out value);
        }
        value = null;
        return false;
    }
 
    public void AddToFreeLocals(Dictionary<(Type, string), Queue<LocalBuilder>> freeLocals)
    {
        foreach (KeyValuePair<string, LocalBuilder> local in _locals)
        {
            (Type, string) key = (local.Value.LocalType, local.Key);
            if (freeLocals.TryGetValue(key, out var value))
            {
                value.Enqueue(local.Value);
                continue;
            }
            value = new Queue<LocalBuilder>();
            value.Enqueue(local.Value);
            freeLocals.Add(key, value);
        }
    }
}