aboutsummaryrefslogtreecommitdiff
path: root/Ryujinx.Memory/Range/RangeList.cs
diff options
context:
space:
mode:
Diffstat (limited to 'Ryujinx.Memory/Range/RangeList.cs')
-rw-r--r--Ryujinx.Memory/Range/RangeList.cs342
1 files changed, 342 insertions, 0 deletions
diff --git a/Ryujinx.Memory/Range/RangeList.cs b/Ryujinx.Memory/Range/RangeList.cs
new file mode 100644
index 00000000..3c8c4c4c
--- /dev/null
+++ b/Ryujinx.Memory/Range/RangeList.cs
@@ -0,0 +1,342 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Ryujinx.Memory.Range
+{
+ /// <summary>
+ /// Sorted list of ranges that supports binary search.
+ /// </summary>
+ /// <typeparam name="T">Type of the range.</typeparam>
+ public class RangeList<T> : IEnumerable<T> where T : IRange
+ {
+ private const int ArrayGrowthSize = 32;
+
+ private readonly List<T> _items;
+
+ public int Count => _items.Count;
+
+ /// <summary>
+ /// Creates a new range list.
+ /// </summary>
+ public RangeList()
+ {
+ _items = new List<T>();
+ }
+
+ /// <summary>
+ /// Adds a new item to the list.
+ /// </summary>
+ /// <param name="item">The item to be added</param>
+ public void Add(T item)
+ {
+ int index = BinarySearch(item.Address);
+
+ if (index < 0)
+ {
+ index = ~index;
+ }
+
+ _items.Insert(index, item);
+ }
+
+ /// <summary>
+ /// Removes an item from the list.
+ /// </summary>
+ /// <param name="item">The item to be removed</param>
+ /// <returns>True if the item was removed, or false if it was not found</returns>
+ public bool Remove(T item)
+ {
+ int index = BinarySearch(item.Address);
+
+ if (index >= 0)
+ {
+ while (index > 0 && _items[index - 1].Address == item.Address)
+ {
+ index--;
+ }
+
+ while (index < _items.Count)
+ {
+ if (_items[index].Equals(item))
+ {
+ _items.RemoveAt(index);
+
+ return true;
+ }
+
+ if (_items[index].Address > item.Address)
+ {
+ break;
+ }
+
+ index++;
+ }
+ }
+
+ return false;
+ }
+
+ /// <summary>
+ /// Gets the first item on the list overlapping in memory with the specified item.
+ /// </summary>
+ /// <remarks>
+ /// Despite the name, this has no ordering guarantees of the returned item.
+ /// It only ensures that the item returned overlaps the specified item.
+ /// </remarks>
+ /// <param name="item">Item to check for overlaps</param>
+ /// <returns>The overlapping item, or the default value for the type if none found</returns>
+ public T FindFirstOverlap(T item)
+ {
+ return FindFirstOverlap(item.Address, item.Size);
+ }
+
+ /// <summary>
+ /// Gets the first item on the list overlapping the specified memory range.
+ /// </summary>
+ /// <remarks>
+ /// Despite the name, this has no ordering guarantees of the returned item.
+ /// It only ensures that the item returned overlaps the specified memory range.
+ /// </remarks>
+ /// <param name="address">Start address of the range</param>
+ /// <param name="size">Size in bytes of the range</param>
+ /// <returns>The overlapping item, or the default value for the type if none found</returns>
+ public T FindFirstOverlap(ulong address, ulong size)
+ {
+ int index = BinarySearch(address, size);
+
+ if (index < 0)
+ {
+ return default(T);
+ }
+
+ return _items[index];
+ }
+
+ /// <summary>
+ /// Gets all items overlapping with the specified item in memory.
+ /// </summary>
+ /// <param name="item">Item to check for overlaps</param>
+ /// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
+ /// <returns>The number of overlapping items found</returns>
+ public int FindOverlaps(T item, ref T[] output)
+ {
+ return FindOverlaps(item.Address, item.Size, ref output);
+ }
+
+ /// <summary>
+ /// Gets all items on the list overlapping the specified memory range.
+ /// </summary>
+ /// <param name="address">Start address of the range</param>
+ /// <param name="size">Size in bytes of the range</param>
+ /// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
+ /// <returns>The number of overlapping items found</returns>
+ public int FindOverlaps(ulong address, ulong size, ref T[] output)
+ {
+ int outputIndex = 0;
+
+ ulong endAddress = address + size;
+
+ foreach (T item in _items)
+ {
+ if (item.Address >= endAddress)
+ {
+ break;
+ }
+
+ if (item.OverlapsWith(address, size))
+ {
+ if (outputIndex == output.Length)
+ {
+ Array.Resize(ref output, outputIndex + ArrayGrowthSize);
+ }
+
+ output[outputIndex++] = item;
+ }
+ }
+
+ return outputIndex;
+ }
+
+ /// <summary>
+ /// Gets all items overlapping with the specified item in memory.
+ /// </summary>
+ /// <remarks>
+ /// This method only returns correct results if none of the items on the list overlaps with
+ /// each other. If that is not the case, this method should not be used.
+ /// This method is faster than the regular method to find all overlaps.
+ /// </remarks>
+ /// <param name="item">Item to check for overlaps</param>
+ /// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
+ /// <returns>The number of overlapping items found</returns>
+ public int FindOverlapsNonOverlapping(T item, ref T[] output)
+ {
+ return FindOverlapsNonOverlapping(item.Address, item.Size, ref output);
+ }
+
+ /// <summary>
+ /// Gets all items on the list overlapping the specified memory range.
+ /// </summary>
+ /// <remarks>
+ /// This method only returns correct results if none of the items on the list overlaps with
+ /// each other. If that is not the case, this method should not be used.
+ /// This method is faster than the regular method to find all overlaps.
+ /// </remarks>
+ /// <param name="address">Start address of the range</param>
+ /// <param name="size">Size in bytes of the range</param>
+ /// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
+ /// <returns>The number of overlapping items found</returns>
+ public int FindOverlapsNonOverlapping(ulong address, ulong size, ref T[] output)
+ {
+ // This is a bit faster than FindOverlaps, but only works
+ // when none of the items on the list overlaps with each other.
+ int outputIndex = 0;
+
+ int index = BinarySearch(address, size);
+
+ if (index >= 0)
+ {
+ while (index > 0 && _items[index - 1].OverlapsWith(address, size))
+ {
+ index--;
+ }
+
+ do
+ {
+ if (outputIndex == output.Length)
+ {
+ Array.Resize(ref output, outputIndex + ArrayGrowthSize);
+ }
+
+ output[outputIndex++] = _items[index++];
+ }
+ while (index < _items.Count && _items[index].OverlapsWith(address, size));
+ }
+
+ return outputIndex;
+ }
+
+ /// <summary>
+ /// Gets all items on the list with the specified memory address.
+ /// </summary>
+ /// <param name="address">Address to find</param>
+ /// <param name="output">Output array where matches will be written. It is automatically resized to fit the results</param>
+ /// <returns>The number of matches found</returns>
+ public int FindOverlaps(ulong address, ref T[] output)
+ {
+ int index = BinarySearch(address);
+
+ int outputIndex = 0;
+
+ if (index >= 0)
+ {
+ while (index > 0 && _items[index - 1].Address == address)
+ {
+ index--;
+ }
+
+ while (index < _items.Count)
+ {
+ T overlap = _items[index++];
+
+ if (overlap.Address != address)
+ {
+ break;
+ }
+
+ if (outputIndex == output.Length)
+ {
+ Array.Resize(ref output, outputIndex + ArrayGrowthSize);
+ }
+
+ output[outputIndex++] = overlap;
+ }
+ }
+
+ return outputIndex;
+ }
+
+ /// <summary>
+ /// Performs binary search on the internal list of items.
+ /// </summary>
+ /// <param name="address">Address to find</param>
+ /// <returns>List index of the item, or complement index of nearest item with lower value on the list</returns>
+ private int BinarySearch(ulong address)
+ {
+ int left = 0;
+ int right = _items.Count - 1;
+
+ while (left <= right)
+ {
+ int range = right - left;
+
+ int middle = left + (range >> 1);
+
+ T item = _items[middle];
+
+ if (item.Address == address)
+ {
+ return middle;
+ }
+
+ if (address < item.Address)
+ {
+ right = middle - 1;
+ }
+ else
+ {
+ left = middle + 1;
+ }
+ }
+
+ return ~left;
+ }
+
+ /// <summary>
+ /// Performs binary search for items overlapping a given memory range.
+ /// </summary>
+ /// <param name="address">Start address of the range</param>
+ /// <param name="size">Size in bytes of the range</param>
+ /// <returns>List index of the item, or complement index of nearest item with lower value on the list</returns>
+ private int BinarySearch(ulong address, ulong size)
+ {
+ int left = 0;
+ int right = _items.Count - 1;
+
+ while (left <= right)
+ {
+ int range = right - left;
+
+ int middle = left + (range >> 1);
+
+ T item = _items[middle];
+
+ if (item.OverlapsWith(address, size))
+ {
+ return middle;
+ }
+
+ if (address < item.Address)
+ {
+ right = middle - 1;
+ }
+ else
+ {
+ left = middle + 1;
+ }
+ }
+
+ return ~left;
+ }
+
+ public IEnumerator<T> GetEnumerator()
+ {
+ return _items.GetEnumerator();
+ }
+
+ IEnumerator IEnumerable.GetEnumerator()
+ {
+ return _items.GetEnumerator();
+ }
+ }
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-04 19:27:35 +0000