Move static helpers to managed

src/coreclr/System.Private.CoreLib/System.Private.CoreLib.csproj

@@ -195,10 +195,12 @@
     <Compile Include="$(BclSourcesRoot)\System\Reflection\RuntimePropertyInfo.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\TypeNameResolver.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Reflection\Metadata\RuntimeTypeMetadataUpdateHandler.cs" />
+    <Compile Include="$(BclSourcesRoot)\System\Runtime\BypassReadyToRunAttribute.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\CastHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\GenericsHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\InitHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\RuntimeHelpers.CoreCLR.cs" />
+    <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\StaticsHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\VirtualDispatchHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\ControlledExecution.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\DependentHandle.cs" />

src/coreclr/System.Private.CoreLib/src/System/Runtime/BypassReadyToRunAttribute.cs

@@ -0,0 +1,10 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Runtime
+{
+    // Use to disable ReadyToRun compilation for a method.
+    internal sealed class BypassReadyToRunAttribute : Attribute
+    {
+    }
+}

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/InitHelpers.cs

@@ -15,7 +15,7 @@ internal static unsafe partial class InitHelpers
 
         [DebuggerHidden]
         [MethodImpl(MethodImplOptions.NoInlining)]
-        private static void InitClassSlow(MethodTable* mt)
+        internal static void InitClassSlow(MethodTable* mt)
         {
             InitClassHelper(mt);
         }

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeHelpers.CoreCLR.cs

@@ -877,8 +877,40 @@ public TypeHandle GetArrayElementTypeHandle()
         /// </summary>
         [MethodImpl(MethodImplOptions.InternalCall)]
         public extern MethodTable* GetMethodTableMatchingParentClass(MethodTable* parent);
+
+        /// <summary>
+        /// Given a statics pointer in the DynamicStaticsInfo, get the actual statics pointer.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        public static extern ref byte MaskStaticsPointer(ref byte staticsPtr);
     }
 
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe ref struct DynamicStaticsInfo
+    {
+        internal const int ISCLASSINITED = 1;
+        internal IntPtr _pGCStatics; // The ISCLASSINITED bit is set when the class is NOT initialized
+        internal IntPtr _pNonGCStatics; // The ISCLASSINITED bit is set when the class is NOT initialized
+        internal unsafe MethodTable* _methodTable;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe ref struct GenericsStaticsInfo
+    {
+        // Pointer to field descs for statics
+        internal IntPtr _pFieldDescs;
+        internal DynamicStaticsInfo _dynamicStatics;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe ref struct ThreadStaticsInfo
+    {
+        internal int _nonGCTlsIndex;
+        internal int _gcTlsIndex;
+        internal GenericsStaticsInfo _genericStatics;
+    }
+
+
     // Subset of src\vm\methodtable.h
     [StructLayout(LayoutKind.Sequential)]
     internal unsafe struct MethodTableAuxiliaryData
@@ -939,6 +971,18 @@ public RuntimeType? ExposedClassObject
         public bool IsClassInited => (Volatile.Read(ref Flags) & enum_flag_Initialized) != 0;
 
         public bool IsClassInitedAndActive => (Volatile.Read(ref Flags) & (enum_flag_Initialized | enum_flag_EnsuredInstanceActive)) == (enum_flag_Initialized | enum_flag_EnsuredInstanceActive);
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public ref DynamicStaticsInfo GetDynamicStaticsInfo()
+        {
+            return ref Unsafe.Subtract(ref Unsafe.As<MethodTableAuxiliaryData, DynamicStaticsInfo>(ref this), 1);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public ref ThreadStaticsInfo GetThreadStaticsInfo()
+        {
+            return ref Unsafe.Subtract(ref Unsafe.As<MethodTableAuxiliaryData, ThreadStaticsInfo>(ref this), 1);
+        }
     }
 
     /// <summary>

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/StaticsHelpers.cs

@@ -0,0 +1,279 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace System.Runtime.CompilerServices
+{
+    [StackTraceHidden]
+    [DebuggerStepThrough]
+    internal static unsafe partial class StaticsHelpers
+    {
+        [LibraryImport(RuntimeHelpers.QCall)]
+        private static partial void GetThreadStaticsByIndex(ByteRefOnStack result, int index, [MarshalAs(UnmanagedType.Bool)] bool gcStatics);
+
+        [LibraryImport(RuntimeHelpers.QCall)]
+        private static partial void GetThreadStaticsByMethodTable(ByteRefOnStack result, MethodTable* pMT, [MarshalAs(UnmanagedType.Bool)] bool gcStatics);
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        [Intrinsic]
+        private static extern ref byte VolatileReadAsByref(ref IntPtr address);
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetNonGCStaticBaseSlow(MethodTable* mt)
+        {
+            InitHelpers.InitClassSlow(mt);
+            return ref MethodTable.MaskStaticsPointer(ref VolatileReadAsByref(ref mt->AuxiliaryData->GetDynamicStaticsInfo()._pNonGCStatics));
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetNonGCStaticBase(MethodTable* mt)
+        {
+            ref byte nonGCStaticBase = ref VolatileReadAsByref(ref mt->AuxiliaryData->GetDynamicStaticsInfo()._pNonGCStatics);
+
+            if ((((nuint)Unsafe.AsPointer(ref nonGCStaticBase)) & DynamicStaticsInfo.ISCLASSINITED) != 0)
+                return ref GetNonGCStaticBaseSlow(mt);
+            else
+                return ref nonGCStaticBase;
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetDynamicNonGCStaticBase(DynamicStaticsInfo *dynamicStaticsInfo)
+        {
+            ref byte nonGCStaticBase = ref VolatileReadAsByref(ref dynamicStaticsInfo->_pNonGCStatics);
+
+            if ((((nuint)Unsafe.AsPointer(ref nonGCStaticBase)) & DynamicStaticsInfo.ISCLASSINITED) != 0)
+                return ref GetNonGCStaticBaseSlow(dynamicStaticsInfo->_methodTable);
+            else
+                return ref nonGCStaticBase;
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetGCStaticBaseSlow(MethodTable* mt)
+        {
+            InitHelpers.InitClassSlow(mt);
+            return ref MethodTable.MaskStaticsPointer(ref VolatileReadAsByref(ref mt->AuxiliaryData->GetDynamicStaticsInfo()._pGCStatics));
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetGCStaticBase(MethodTable* mt)
+        {
+            ref byte gcStaticBase = ref VolatileReadAsByref(ref mt->AuxiliaryData->GetDynamicStaticsInfo()._pGCStatics);
+
+            if ((((nuint)Unsafe.AsPointer(ref gcStaticBase)) & DynamicStaticsInfo.ISCLASSINITED) != 0)
+                return ref GetGCStaticBaseSlow(mt);
+            else
+                return ref gcStaticBase;
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetDynamicGCStaticBase(DynamicStaticsInfo *dynamicStaticsInfo)
+        {
+            ref byte gcStaticBase = ref VolatileReadAsByref(ref dynamicStaticsInfo->_pGCStatics);
+
+            if ((((nuint)Unsafe.AsPointer(ref gcStaticBase)) & DynamicStaticsInfo.ISCLASSINITED) != 0)
+                return ref GetGCStaticBaseSlow(dynamicStaticsInfo->_methodTable);
+            else
+                return ref gcStaticBase;
+        }
+
+        // Thread static helpers
+
+        [StructLayout(LayoutKind.Sequential)]
+        private sealed class RawData
+        {
+            internal byte _data;
+        }
+
+        /// <summary>
+        /// Return beginning of the object as a reference to byte
+        /// </summary>
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static ref byte GetObjectAsRefByte(object obj)
+        {
+            return ref Unsafe.Add(ref Unsafe.As<RawData>(obj)._data, -sizeof(MethodTable*));
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct ThreadLocalData
+        {
+            internal const int NUMBER_OF_TLSOFFSETS_NOT_USED_IN_NONCOLLECTIBLE_ARRAY = 2;
+            internal int _cNonCollectibleTlsData; // Size of offset into the non-collectible TLS array which is valid, NOTE: this is relative to the start of the nonCollectibleTlsArrayData object, not the start of the data in the array
+            internal int _cCollectibleTlsData; // Size of offset into the TLS array which is valid
+            private IntPtr _nonCollectibleTlsArrayData_private; // This is object[], but using object[] directly causes the structure to be laid out via auto-layout, which is not what we want.
+            internal IntPtr* _collectibleTlsArrayData; // Points at the Thread local array data.
+
+            internal object[] NonCollectibleTlsArrayData
+            {
+                [MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get
+                {
+                    return Unsafe.As<IntPtr, object[]>(ref _nonCollectibleTlsArrayData_private);
+                }
+            }
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static int GetIndexOffset(int index)
+        {
+            return index & 0xFFFFFF;
+        }
+
+        private const int NonCollectibleTLSIndexType = 0;
+        private const int DirectOnThreadLocalDataTLSIndexType = 2;
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static int GetIndexType(int index)
+        {
+            return index >> 24;
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static bool IsIndexAllocated(int index)
+        {
+            return index != -1;
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetNonGCThreadStaticsByIndexSlow(int index)
+        {
+            ByteRef result = default;
+            GetThreadStaticsByIndex(ByteRefOnStack.Create(ref result), index, false);
+            return ref result.Get();
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetGCThreadStaticsByIndexSlow(int index)
+        {
+            ByteRef result = default;
+            GetThreadStaticsByIndex(ByteRefOnStack.Create(ref result), index, true);
+            return ref result.Get();
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetNonGCThreadStaticBaseSlow(MethodTable* mt)
+        {
+            ByteRef result = default;
+            GetThreadStaticsByMethodTable(ByteRefOnStack.Create(ref result), mt, false);
+            return ref result.Get();
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static ref byte GetGCThreadStaticBaseSlow(MethodTable* mt)
+        {
+            ByteRef result = default;
+            GetThreadStaticsByMethodTable(ByteRefOnStack.Create(ref result), mt, true);
+            return ref result.Get();
+        }
+
+        [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static ref byte GetThreadLocalStaticBaseByIndex(int index, bool gcStatics)
+        {
+            ThreadLocalData *t_ThreadStatics = System.Threading.Thread.GetThreadStaticsBase();
+            int indexOffset = GetIndexOffset(index);
+            if (GetIndexType(index) == NonCollectibleTLSIndexType)
+            {
+                if (t_ThreadStatics->_cNonCollectibleTlsData > GetIndexOffset(index))
+                {
+                    object? threadStaticObjectNonCollectible = Unsafe.Add(ref MemoryMarshal.GetArrayDataReference(t_ThreadStatics->NonCollectibleTlsArrayData), indexOffset - ThreadLocalData.NUMBER_OF_TLSOFFSETS_NOT_USED_IN_NONCOLLECTIBLE_ARRAY);
+                    if (threadStaticObjectNonCollectible != null)
+                    {
+                        return ref GetObjectAsRefByte(threadStaticObjectNonCollectible);
+                    }
+                }
+            }
+            else if (GetIndexType(index) == DirectOnThreadLocalDataTLSIndexType)
+            {
+                return ref Unsafe.Add(ref Unsafe.AsRef<byte>(t_ThreadStatics), indexOffset);
+            }
+            else
+            {
+                int cCollectibleTlsData = t_ThreadStatics->_cNonCollectibleTlsData;
+                if (cCollectibleTlsData > indexOffset)
+                {
+                    IntPtr* pCollectibleTlsArrayData = t_ThreadStatics->_collectibleTlsArrayData;
+
+                    pCollectibleTlsArrayData += indexOffset;
+                    IntPtr objHandle = *pCollectibleTlsArrayData;
+                    if (objHandle != IntPtr.Zero)
+                    {
+                        object? threadStaticObject = GCHandle.InternalGet(objHandle);
+                        if (threadStaticObject != null)
+                        {
+                            return ref GetObjectAsRefByte(threadStaticObject);
+                        }
+                    }
+                }
+            }
+
+            if (gcStatics)
+                return ref GetGCThreadStaticsByIndexSlow(index);
+            else
+                return ref GetNonGCThreadStaticsByIndexSlow(index);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetNonGCThreadStaticBase(MethodTable* mt)
+        {
+            int index = mt->AuxiliaryData->GetThreadStaticsInfo()._nonGCTlsIndex;
+            if (IsIndexAllocated(index))
+                return ref GetThreadLocalStaticBaseByIndex(index, false);
+            else
+                return ref GetNonGCThreadStaticBaseSlow(mt);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetGCThreadStaticBase(MethodTable* mt)
+        {
+            int index = mt->AuxiliaryData->GetThreadStaticsInfo()._gcTlsIndex;
+            if (IsIndexAllocated(index))
+                return ref GetThreadLocalStaticBaseByIndex(index, true);
+            else
+                return ref GetGCThreadStaticBaseSlow(mt);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetDynamicNonGCThreadStaticBase(ThreadStaticsInfo *threadStaticsInfo)
+        {
+            int index = threadStaticsInfo->_nonGCTlsIndex;
+            if (IsIndexAllocated(index))
+                return ref GetThreadLocalStaticBaseByIndex(index, false);
+            else
+                return ref GetNonGCThreadStaticBaseSlow(threadStaticsInfo->_genericStatics._dynamicStatics._methodTable);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetDynamicGCThreadStaticBase(ThreadStaticsInfo *threadStaticsInfo)
+        {
+            int index = threadStaticsInfo->_gcTlsIndex;
+            if (IsIndexAllocated(index))
+                return ref GetThreadLocalStaticBaseByIndex(index, true);
+            else
+                return ref GetGCThreadStaticBaseSlow(threadStaticsInfo->_genericStatics._dynamicStatics._methodTable);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetOptimizedNonGCThreadStaticBase(int index)
+        {
+            return ref GetThreadLocalStaticBaseByIndex(index, false);
+        }
+
+        [DebuggerHidden]
+        private static ref byte GetOptimizedGCThreadStaticBase(int index)
+        {
+            return ref GetThreadLocalStaticBaseByIndex(index, true);
+        }
+    }
+}