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Commit 741070b

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author
dse
committed
Python string to CLR string marshaling cache added.
1 parent 507edc9 commit 741070b

9 files changed

+531
-5
lines changed

‎src/runtime/Python.Runtime.csproj

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<Reference Include="System" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="perf_utils\EncodedStringsFifoDictionary.cs" />
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<Compile Include="perf_utils\EncodingGetStringPolyfill.cs" />
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<Compile Include="perf_utils\FifoDictionary.cs" />
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<Compile Include="perf_utils\RawImmutableMemBlock.cs" />
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<Compile Include="perf_utils\RawMemoryFifoDictionary.cs" />
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<Compile Include="perf_utils\RawMemUtils.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="..\SharedAssemblyInfo.cs">
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<Link>Properties\SharedAssemblyInfo.cs</Link>

‎src/runtime/perf_utils/EncodedStringsFifoDictionary.cs

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using System;
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namespace Python.Runtime
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{
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using System.Runtime.InteropServices;
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public class EncodedStringsFifoDictionary: IDisposable
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{
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private readonly FifoDictionary<string, IntPtr> _innerDictionary;
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private readonly IntPtr _rawMemory;
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private readonly int _allocatedSize;
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public EncodedStringsFifoDictionary(int capacity, int maxItemSize)
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{
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if (maxItemSize < 1)
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{
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throw new ArgumentOutOfRangeException(
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nameof(maxItemSize),
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"Maximum item size should be non-zero positive.");
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}
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_innerDictionary = new FifoDictionary<string, IntPtr>(capacity);
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_allocatedSize = maxItemSize * capacity;
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_rawMemory = Marshal.AllocHGlobal(_allocatedSize);
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MaxItemSize = maxItemSize;
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}
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public int MaxItemSize { get; }
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public bool TryGetValue(string key, out IntPtr value)
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{
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return _innerDictionary.TryGetValue(key, out value);
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}
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public IntPtr AddUnsafe(string key)
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{
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int nextSlot = _innerDictionary.NextSlotToAdd;
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IntPtr ptr = _rawMemory + (MaxItemSize * nextSlot);
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_innerDictionary.AddUnsafe(key, ptr);
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return ptr;
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}
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public bool IsKnownPtr(IntPtr ptr)
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{
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var uptr = (ulong)ptr;
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var umem = (ulong)_rawMemory;
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return uptr >= umem && uptr < umem + (ulong)_allocatedSize;
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}
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private void ReleaseUnmanagedResources()
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{
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if (_rawMemory != IntPtr.Zero)
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{
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Marshal.FreeHGlobal(_rawMemory);
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}
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}
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public void Dispose()
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{
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ReleaseUnmanagedResources();
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GC.SuppressFinalize(this);
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}
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~EncodedStringsFifoDictionary()
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{
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ReleaseUnmanagedResources();
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}
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}
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}

‎src/runtime/perf_utils/EncodingGetStringPolyfill.cs

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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace Python.Runtime
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{
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/// <summary>
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/// This polyfill is thread unsafe.
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/// </summary>
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#if !NETSTANDARD
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public static class EncodingGetStringPolyfill
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{
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private static readonly MethodInfo PlatformGetStringMethodInfo =
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typeof(Encoding).GetMethod(
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"GetString",
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BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null,
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new[]
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{
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typeof(byte*), typeof(int)
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}, null);
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private static readonly byte[] StdDecodeBuffer = PlatformGetStringMethodInfo == null ? new byte[1024 * 1024] : null;
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private static Dictionary<Encoding, EncodingGetStringUnsafeDelegate> PlatformGetStringMethodsDelegatesCache = new Dictionary<Encoding, EncodingGetStringUnsafeDelegate>();
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private unsafe delegate string EncodingGetStringUnsafeDelegate(byte* pstr, int size);
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public unsafe static string GetString(this Encoding encoding, byte* pstr, int size)
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{
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if (PlatformGetStringMethodInfo != null)
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{
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EncodingGetStringUnsafeDelegate getStringDelegate;
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if (!PlatformGetStringMethodsDelegatesCache.TryGetValue(encoding, out getStringDelegate))
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{
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getStringDelegate =
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(EncodingGetStringUnsafeDelegate)PlatformGetStringMethodInfo.CreateDelegate(
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typeof(EncodingGetStringUnsafeDelegate), encoding);
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PlatformGetStringMethodsDelegatesCache.Add(encoding, getStringDelegate);
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}
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return getStringDelegate(pstr, size);
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}
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byte[] buffer = size <= StdDecodeBuffer.Length ? StdDecodeBuffer : new byte[size];
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Marshal.Copy((IntPtr)pstr, buffer, 0, size);
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return encoding.GetString(buffer, 0, size);
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}
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}
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#endif
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}

‎src/runtime/perf_utils/FifoDictionary.cs

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using System;
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namespace Python.Runtime
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{
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using System.Collections.Generic;
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public class FifoDictionary<TKey, TValue>
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{
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private readonly Dictionary<TKey, int> _innerDictionary;
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private readonly KeyValuePair<TKey,TValue>[] _fifoList;
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private bool _hasEmptySlots = true;
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public FifoDictionary(int capacity)
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{
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if (capacity <= 0)
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{
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throw new ArgumentOutOfRangeException(nameof(capacity), "Capacity should be non-zero positive.");
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}
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_innerDictionary = new Dictionary<TKey, int>(capacity);
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_fifoList = new KeyValuePair<TKey, TValue>[capacity];
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Capacity = capacity;
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}
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public bool TryGetValue(TKey key, out TValue value)
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{
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int index;
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if (_innerDictionary.TryGetValue(key, out index))
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{
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value =_fifoList[index].Value;
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return true;
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}
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value = default(TValue);
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return false;
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}
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public void AddUnsafe(TKey key, TValue value)
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{
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if (!_hasEmptySlots)
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{
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_innerDictionary.Remove(_fifoList[NextSlotToAdd].Key);
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}
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_innerDictionary.Add(key, NextSlotToAdd);
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_fifoList[NextSlotToAdd] = new KeyValuePair<TKey, TValue>(key, value);
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NextSlotToAdd++;
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if (NextSlotToAdd >= Capacity)
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{
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_hasEmptySlots = false;
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NextSlotToAdd = 0;
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}
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}
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public int NextSlotToAdd { get; private set; }
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public int Capacity { get; }
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}
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}

‎src/runtime/perf_utils/RawImmutableMemBlock.cs

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namespace Python.Runtime
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{
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using System;
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public struct RawImmutableMemBlock: IEquatable<RawImmutableMemBlock>
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{
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private readonly int _hash;
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public RawImmutableMemBlock(IntPtr ptr, int size)
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{
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if (ptr == IntPtr.Zero)
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{
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throw new ArgumentException("Memory pointer should not be zero", nameof(ptr));
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}
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if (size < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(size), "Size should be zero or positive.");
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}
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Ptr = ptr;
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Size = size;
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_hash = RawMemUtils.FastXorHash(ptr, size);
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}
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public RawImmutableMemBlock(RawImmutableMemBlock memBlock, IntPtr newPtr)
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{
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if (memBlock.Ptr == IntPtr.Zero)
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{
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throw new ArgumentException("Cannot copy non initialized RawImmutableMemBlock structure.", nameof(memBlock));
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}
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if (newPtr == IntPtr.Zero)
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{
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throw new ArgumentException("Cannot copy to zero pointer.");
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}
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RawMemUtils.CopyMemBlocks(memBlock.Ptr, newPtr, memBlock.Size);
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Ptr = newPtr;
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Size = memBlock.Size;
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_hash = memBlock._hash;
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}
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public IntPtr Ptr { get; }
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public int Size { get; }
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public bool Equals(RawImmutableMemBlock other)
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{
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bool preEqual = _hash == other._hash && Size == other.Size;
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if (!preEqual)
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{
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return false;
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}
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return RawMemUtils.CompareMemBlocks(Ptr, other.Ptr, Size);
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}
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/// <inheritdoc/>
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public override bool Equals(object obj)
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{
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return obj is RawImmutableMemBlock && Equals((RawImmutableMemBlock)obj);
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}
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/// <inheritdoc/>
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public override int GetHashCode()
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{
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unchecked
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{
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return (_hash * 397) ^ Size;
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}
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}
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public static bool operator ==(RawImmutableMemBlock left, RawImmutableMemBlock right)
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{
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return left.Equals(right);
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}
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public static bool operator !=(RawImmutableMemBlock left, RawImmutableMemBlock right)
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{
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return !left.Equals(right);
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}
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}
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}

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