Ryujinx/Ryujinx.Memory/WindowsShared/MappingTree.cs

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C#
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using Ryujinx.Common.Collections;
using System;
namespace Ryujinx.Memory.WindowsShared
{
/// <summary>
/// A intrusive Red-Black Tree that also supports getting nodes overlapping a given range.
/// </summary>
/// <typeparam name="T">Type of the value stored on the node</typeparam>
class MappingTree<T> : IntrusiveRedBlackTree<RangeNode<T>>
{
private const int ArrayGrowthSize = 16;
public int GetNodes(ulong start, ulong end, ref RangeNode<T>[] overlaps, int overlapCount = 0)
{
RangeNode<T> node = GetNode(new RangeNode<T>(start, start + 1UL, default));
for (; node != null; node = node.Successor)
{
if (overlaps.Length <= overlapCount)
{
Array.Resize(ref overlaps, overlapCount + ArrayGrowthSize);
}
overlaps[overlapCount++] = node;
if (node.End >= end)
{
break;
}
}
return overlapCount;
}
}
class RangeNode<T> : IntrusiveRedBlackTreeNode<RangeNode<T>>, IComparable<RangeNode<T>>
{
public ulong Start { get; }
public ulong End { get; private set; }
public T Value { get; }
public RangeNode(ulong start, ulong end, T value)
{
Start = start;
End = end;
Value = value;
}
public void Extend(ulong sizeDelta)
{
End += sizeDelta;
}
public int CompareTo(RangeNode<T> other)
{
if (Start < other.Start)
{
return -1;
}
else if (Start <= other.End - 1UL)
{
return 0;
}
else
{
return 1;
}
}
}
}