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using Ryujinx.Common;
using Ryujinx.Memory;
using System;
using System.Collections.Generic;
using System.Diagnostics;
namespace Ryujinx.Cpu
{
class PrivateMemoryAllocator : PrivateMemoryAllocatorImpl<PrivateMemoryAllocator.Block>
{
public const ulong InvalidOffset = ulong.MaxValue;
public class Block : IComparable<Block>
{
public MemoryBlock Memory { get; private set; }
public ulong Size { get; }
private readonly struct Range : IComparable<Range>
{
public ulong Offset { get; }
public ulong Size { get; }
public Range(ulong offset, ulong size)
{
Offset = offset;
Size = size;
}
public int CompareTo(Range other)
{
return Offset.CompareTo(other.Offset);
}
}
private readonly List<Range> _freeRanges;
public Block(MemoryBlock memory, ulong size)
{
Memory = memory;
Size = size;
_freeRanges = new List<Range>
{
new Range(0, size),
};
}
public ulong Allocate(ulong size, ulong alignment)
{
for (int i = 0; i < _freeRanges.Count; i++)
{
var range = _freeRanges[i];
ulong alignedOffset = BitUtils.AlignUp(range.Offset, alignment);
ulong sizeDelta = alignedOffset - range.Offset;
ulong usableSize = range.Size - sizeDelta;
if (sizeDelta < range.Size && usableSize >= size)
{
_freeRanges.RemoveAt(i);
if (sizeDelta != 0)
{
InsertFreeRange(range.Offset, sizeDelta);
}
ulong endOffset = range.Offset + range.Size;
ulong remainingSize = endOffset - (alignedOffset + size);
if (remainingSize != 0)
{
InsertFreeRange(endOffset - remainingSize, remainingSize);
}
return alignedOffset;
}
}
return InvalidOffset;
}
public void Free(ulong offset, ulong size)
{
InsertFreeRangeComingled(offset, size);
}
private void InsertFreeRange(ulong offset, ulong size)
{
var range = new Range(offset, size);
int index = _freeRanges.BinarySearch(range);
if (index < 0)
{
index = ~index;
}
_freeRanges.Insert(index, range);
}
private void InsertFreeRangeComingled(ulong offset, ulong size)
{
ulong endOffset = offset + size;
var range = new Range(offset, size);
int index = _freeRanges.BinarySearch(range);
if (index < 0)
{
index = ~index;
}
if (index < _freeRanges.Count && _freeRanges[index].Offset == endOffset)
{
endOffset = _freeRanges[index].Offset + _freeRanges[index].Size;
_freeRanges.RemoveAt(index);
}
if (index > 0 && _freeRanges[index - 1].Offset + _freeRanges[index - 1].Size == offset)
{
offset = _freeRanges[index - 1].Offset;
_freeRanges.RemoveAt(--index);
}
range = new Range(offset, endOffset - offset);
_freeRanges.Insert(index, range);
}
public bool IsTotallyFree()
{
if (_freeRanges.Count == 1 && _freeRanges[0].Size == Size)
{
Debug.Assert(_freeRanges[0].Offset == 0);
return true;
}
return false;
}
public int CompareTo(Block other)
{
return Size.CompareTo(other.Size);
}
public virtual void Destroy()
{
Memory.Dispose();
}
}
public PrivateMemoryAllocator(int blockAlignment, MemoryAllocationFlags allocationFlags) : base(blockAlignment, allocationFlags)
{
}
public PrivateMemoryAllocation Allocate(ulong size, ulong alignment)
{
var allocation = Allocate(size, alignment, CreateBlock);
return new PrivateMemoryAllocation(this, allocation.Block, allocation.Offset, allocation.Size);
}
private Block CreateBlock(MemoryBlock memory, ulong size)
{
return new Block(memory, size);
}
}
class PrivateMemoryAllocatorImpl<T> : IDisposable where T : PrivateMemoryAllocator.Block
{
private const ulong InvalidOffset = ulong.MaxValue;
public readonly struct Allocation
{
public T Block { get; }
public ulong Offset { get; }
public ulong Size { get; }
public Allocation(T block, ulong offset, ulong size)
{
Block = block;
Offset = offset;
Size = size;
}
}
private readonly List<T> _blocks;
private readonly int _blockAlignment;
private readonly MemoryAllocationFlags _allocationFlags;
public PrivateMemoryAllocatorImpl(int blockAlignment, MemoryAllocationFlags allocationFlags)
{
_blocks = new List<T>();
_blockAlignment = blockAlignment;
_allocationFlags = allocationFlags;
}
protected Allocation Allocate(ulong size, ulong alignment, Func<MemoryBlock, ulong, T> createBlock)
{
// Ensure we have a sane alignment value.
if ((ulong)(int)alignment != alignment || (int)alignment <= 0)
{
throw new ArgumentOutOfRangeException(nameof(alignment), $"Invalid alignment 0x{alignment:X}.");
}
for (int i = 0; i < _blocks.Count; i++)
{
var block = _blocks[i];
if (block.Size >= size)
{
ulong offset = block.Allocate(size, alignment);
if (offset != InvalidOffset)
{
return new Allocation(block, offset, size);
}
}
}
ulong blockAlignedSize = BitUtils.AlignUp(size, (ulong)_blockAlignment);
var memory = new MemoryBlock(blockAlignedSize, _allocationFlags);
var newBlock = createBlock(memory, blockAlignedSize);
InsertBlock(newBlock);
ulong newBlockOffset = newBlock.Allocate(size, alignment);
Debug.Assert(newBlockOffset != InvalidOffset);
return new Allocation(newBlock, newBlockOffset, size);
}
public void Free(PrivateMemoryAllocator.Block block, ulong offset, ulong size)
{
block.Free(offset, size);
if (block.IsTotallyFree())
{
for (int i = 0; i < _blocks.Count; i++)
{
if (_blocks[i] == block)
{
_blocks.RemoveAt(i);
break;
}
}
block.Destroy();
}
}
private void InsertBlock(T block)
{
int index = _blocks.BinarySearch(block);
if (index < 0)
{
index = ~index;
}
_blocks.Insert(index, block);
}
public void Dispose()
{
for (int i = 0; i < _blocks.Count; i++)
{
_blocks[i].Destroy();
}
_blocks.Clear();
}
}
}
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