145 lines
5.2 KiB
C#
145 lines
5.2 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="UnmanagedMemoryPool.IndexNode.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection.Emit;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Runtime.Serialization;
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using System.Text;
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using System.Threading.Tasks;
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namespace StgSharp.HighPerformance
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{
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public unsafe partial class UnmanagedMemoryPool
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{
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private const int
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LevelOf4096 = 4,
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LevelOf1024 = 3,
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LevelOf256 = 2,
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LevelOf64 = 1;
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internal readonly ref struct NextIndexNode
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{
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private readonly Span<M64> _layout;
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public readonly nuint this[int level]
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => Position - _layout[level].Member<uint>(0);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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set => _layout[level].Member<uint>(0) = (uint)(Position - value);
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}
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private readonly ref nuint Position
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => ref _layout[0].Member<nuint>(0);
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}
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}
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internal readonly ref struct PreviousIndexNode
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{
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private readonly Span<M64> _layout;
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public readonly nuint this[int level]
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => Position - _layout[level].Member<uint>(1);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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set => _layout[level].Member<uint>(1) = (uint)(Position - value);
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}
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private readonly ref nuint Position
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => ref _layout[0].Member<nuint>(0);
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}
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}
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[StructLayout(LayoutKind.Explicit)]
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internal readonly ref struct IndexNode
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{
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private static readonly uint[] _sizeArr = [16, 64, 256, 1024, 4096];
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[FieldOffset(0)] private readonly NextIndexNode nxt;
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[FieldOffset(0)] private readonly PreviousIndexNode pre;
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[FieldOffset(0)] private readonly Span<M64> _layout;
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public IndexNode(ref byte span)
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{
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_layout = MemoryMarshal.CreateSpan(ref Unsafe.As<byte, M64>(ref span), 8);
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}
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public readonly ref nuint Position => ref _layout[0].Member<nuint>(0);
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public readonly ref uint Size => ref _layout[5].Member<uint>(0);
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public readonly ref int Level => ref _layout[5].Member<int>(1);
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public readonly ref nuint Segment => ref _layout[6].Member<nuint>(0);
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public readonly uint BlockSize => LevelToSize(Level);
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public static uint LevelToSize(int level)
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{
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return level switch
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{
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< 0 or > 4 => throw new ArgumentOutOfRangeException(
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nameof(level), "Level must be from 1 to 4."),
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_ => _sizeArr[level]
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};
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}
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#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
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public readonly ref readonly NextIndexNode Next
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => ref nxt;
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}
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public readonly ref readonly PreviousIndexNode Previous
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => ref pre;
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}
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#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
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}
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}
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}
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