Roslyn update response (#43056)

* Update function pointer syntax usage to official.

* Fix warnings with new Roslyn
Co-authored-by: NJan Kotas <jkotas@microsoft.com>

eng/Versions.props

@@ -30,6 +30,7 @@
       release, increase this number by one.
     -->
     <NETStandardPatchVersion>0</NETStandardPatchVersion>
+    <MicrosoftNetCompilersToolsetVersion>3.8.0-4.20503.2</MicrosoftNetCompilersToolsetVersion>
   </PropertyGroup>
   <!--
     Servicing build settings for Setup/Installer packages. Instructions:

src/coreclr/src/tools/Common/JitInterface/JitConfigProvider.cs

@@ -159,8 +159,8 @@ private static unsafe IntPtr CreateUnmanagedInstance()
 
             void** callbacks = (void**)Marshal.AllocCoTaskMem(sizeof(IntPtr) * numCallbacks);
 
-            callbacks[0] = (delegate* <IntPtr, char*, int, int>)&getIntConfigValue;
-            callbacks[1] = (delegate* <IntPtr, char*, char*, int, int>)&getStringConfigValue;
+            callbacks[0] = (delegate* unmanaged<IntPtr, char*, int, int>)&getIntConfigValue;
+            callbacks[1] = (delegate* unmanaged<IntPtr, char*, char*, int, int>)&getStringConfigValue;
 
             IntPtr instance = Marshal.AllocCoTaskMem(sizeof(IntPtr));
             *(IntPtr*)instance = (IntPtr)callbacks;

src/coreclr/src/tools/Common/JitInterface/ThunkGenerator/Program.cs

@@ -333,7 +333,7 @@ static IntPtr GetUnmanagedCallbacks()
             int index = 0;
             foreach (FunctionDecl decl in functionData)
             {
-                tr.Write($"            callbacks[{index}] = (delegate* <IntPtr, IntPtr*");
+                tr.Write($"            callbacks[{index}] = (delegate* unmanaged<IntPtr, IntPtr*");
                 foreach (Parameter param in decl.Parameters)
                 {
                     tr.Write($", {param.Type.UnmanagedTypeName}");

src/installer/managed/Microsoft.NET.HostModel/AppHost/RetryUtil.cs

@@ -41,7 +41,7 @@ public static void RetryOnIOError(Action func)
 
         public static void RetryOnWin32Error(Action func)
         {
-            bool IsKnownIrrecoverableError(int hresult)
+            static bool IsKnownIrrecoverableError(int hresult)
             {
                 // Error codes are defined in winerror.h
                 // The error code is stored in the lowest 16 bits of the HResult

src/libraries/Common/src/Extensions/ParameterDefaultValue/ParameterDefaultValue.cs

@@ -47,7 +47,7 @@ public static bool TryGetDefaultValue(ParameterInfo parameter, out object? defau
 
                 [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2067:UnrecognizedReflectionPattern",
                     Justification = "CreateInstance is only called on a ValueType, which will always have a default constructor.")]
-                object? CreateValueType(Type t) => Activator.CreateInstance(t);
+                static object? CreateValueType(Type t) => Activator.CreateInstance(t);
 
                 // Handle nullable enums
                 if (defaultValue != null &&

src/libraries/Common/src/Interop/Interop.Calendar.cs

@@ -16,7 +16,7 @@ internal static partial class Globalization
         internal static extern unsafe ResultCode GetCalendarInfo(string localeName, CalendarId calendarId, CalendarDataType calendarDataType, char* result, int resultCapacity);
 
         [DllImport(Libraries.GlobalizationNative, CharSet = CharSet.Unicode, EntryPoint = "GlobalizationNative_EnumCalendarInfo")]
-        internal static extern unsafe bool EnumCalendarInfo(delegate* <char*, IntPtr, void> callback, string localeName, CalendarId calendarId, CalendarDataType calendarDataType, IntPtr context);
+        internal static extern unsafe bool EnumCalendarInfo(delegate* unmanaged<char*, IntPtr, void> callback, string localeName, CalendarId calendarId, CalendarDataType calendarDataType, IntPtr context);
 
         [DllImport(Libraries.GlobalizationNative, EntryPoint = "GlobalizationNative_GetLatestJapaneseEra")]
         internal static extern int GetLatestJapaneseEra();

src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Globalization.cs

@@ -122,10 +122,10 @@ internal static unsafe partial class Kernel32
         internal static extern int GetLocaleInfoEx(string lpLocaleName, uint LCType, void* lpLCData, int cchData);
 
         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
-        internal static extern bool EnumSystemLocalesEx(delegate* <char*, uint, void*, BOOL> lpLocaleEnumProcEx, uint dwFlags, void* lParam, IntPtr reserved);
+        internal static extern bool EnumSystemLocalesEx(delegate* unmanaged<char*, uint, void*, BOOL> lpLocaleEnumProcEx, uint dwFlags, void* lParam, IntPtr reserved);
 
         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
-        internal static extern bool EnumTimeFormatsEx(delegate* <char*, void*, BOOL> lpTimeFmtEnumProcEx, string lpLocaleName, uint dwFlags, void* lParam);
+        internal static extern bool EnumTimeFormatsEx(delegate* unmanaged<char*, void*, BOOL> lpTimeFmtEnumProcEx, string lpLocaleName, uint dwFlags, void* lParam);
 
         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
         internal static extern int GetCalendarInfoEx(string? lpLocaleName, uint Calendar, IntPtr lpReserved, uint CalType, IntPtr lpCalData, int cchData, out int lpValue);
@@ -140,7 +140,7 @@ internal static unsafe partial class Kernel32
         internal static extern int GetGeoInfo(int location, int geoType, char* lpGeoData, int cchData, int LangId);
 
         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
-        internal static extern bool EnumCalendarInfoExEx(delegate* <char*, uint, IntPtr, void*, BOOL> pCalInfoEnumProcExEx, string lpLocaleName, uint Calendar, string? lpReserved, uint CalType, void* lParam);
+        internal static extern bool EnumCalendarInfoExEx(delegate* unmanaged<char*, uint, IntPtr, void*, BOOL> pCalInfoEnumProcExEx, string lpLocaleName, uint Calendar, string? lpReserved, uint CalType, void* lParam);
 
         [StructLayout(LayoutKind.Sequential)]
         internal struct NlsVersionInfoEx

src/libraries/System.Console/src/System/Console.cs

@@ -128,12 +128,12 @@ public static Encoding OutputEncoding
                     if (s_out != null && !s_isOutTextWriterRedirected)
                     {
                         s_out.Flush();
-                        Volatile.Write(ref s_out, null);
+                        Volatile.Write(ref s_out, null!);
                     }
                     if (s_error != null && !s_isErrorTextWriterRedirected)
                     {
                         s_error.Flush();
-                        Volatile.Write(ref s_error, null);
+                        Volatile.Write(ref s_error, null!);
                     }
 
                     Volatile.Write(ref s_outputEncoding, (Encoding)value.Clone());

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Linux.cs

@@ -331,7 +331,7 @@ internal static string GetUntruncatedProcessName(ref Interop.procfs.ParsedStat s
                 }
             }
 
-            string? GetUntruncatedNameFromArg(Span<byte> arg, string prefix)
+            static string? GetUntruncatedNameFromArg(Span<byte> arg, string prefix)
             {
                 // Strip directory names from arg.
                 int nameStart = arg.LastIndexOf((byte)'/') + 1;

src/libraries/System.Formats.Asn1/src/System/Formats/Asn1/AsnDecoder.GeneralizedTime.cs

@@ -144,7 +144,7 @@ public static partial class AsnDecoder
             const byte SuffixState = 2;
             byte state = HmsState;
 
-            byte? GetNextState(byte octet)
+            static byte? GetNextState(byte octet)
             {
                 if (octet == 'Z' || octet == '-' || octet == '+')
                 {

src/libraries/System.IO.FileSystem.Watcher/src/System/IO/FileSystemWatcher.OSX.cs

@@ -473,7 +473,7 @@ internal void Start(CancellationToken cancellationToken)
 
                 this._context = ExecutionContext.Capture();
 
-                ParsedEvent ParseEvent(byte* nativeEventPath)
+                static ParsedEvent ParseEvent(byte* nativeEventPath)
                 {
                     int byteCount = 0;
                     Debug.Assert(nativeEventPath != null);

src/libraries/System.IO.Pipelines/src/System/IO/Pipelines/StreamExtensions.netstandard.cs

@@ -25,7 +25,7 @@ public static ValueTask<int> ReadAsync(this Stream stream, Memory<byte> buffer,
                 byte[] sharedBuffer = ArrayPool<byte>.Shared.Rent(buffer.Length);
                 return FinishReadAsync(stream.ReadAsync(sharedBuffer, 0, buffer.Length, cancellationToken), sharedBuffer, buffer);
 
-                async ValueTask<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer, Memory<byte> localDestination)
+                static async ValueTask<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer, Memory<byte> localDestination)
                 {
                     try
                     {

src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs

@@ -101,7 +101,7 @@ internal ValueTask ConnectAsync(EndPoint remoteEP, CancellationToken cancellatio
                 return WaitForConnectWithCancellation(saea, connectTask, cancellationToken);
             }
 
-            async ValueTask WaitForConnectWithCancellation(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
+            static async ValueTask WaitForConnectWithCancellation(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
             {
                 Debug.Assert(cancellationToken.CanBeCanceled);
                 try

src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Windows.cs

@@ -920,7 +920,7 @@ public static unsafe SocketError Poll(SafeSocketHandle handle, int microseconds,
         public static unsafe SocketError Select(IList? checkRead, IList? checkWrite, IList? checkError, int microseconds)
         {
             const int StackThreshold = 64; // arbitrary limit to avoid too much space on stack
-            bool ShouldStackAlloc(IList? list, ref IntPtr[]? lease, out Span<IntPtr> span)
+            static bool ShouldStackAlloc(IList? list, ref IntPtr[]? lease, out Span<IntPtr> span)
             {
                 int count;
                 if (list == null || (count = list.Count) == 0)

src/libraries/System.Net.WebSockets.WebSocketProtocol/src/System/Net/WebSockets/ManagedWebSocketExtensions.netstandard.cs

@@ -33,7 +33,7 @@ internal static ValueTask<int> ReadAsync(this Stream stream, Memory<byte> destin
                 byte[] buffer = ArrayPool<byte>.Shared.Rent(destination.Length);
                 return new ValueTask<int>(FinishReadAsync(stream.ReadAsync(buffer, 0, destination.Length, cancellationToken), buffer, destination));
 
-                async Task<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer, Memory<byte> localDestination)
+                static async Task<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer, Memory<byte> localDestination)
                 {
                     try
                     {
@@ -61,7 +61,7 @@ internal static ValueTask WriteAsync(this Stream stream, ReadOnlyMemory<byte> so
                 source.Span.CopyTo(buffer);
                 return new ValueTask(FinishWriteAsync(stream.WriteAsync(buffer, 0, source.Length, cancellationToken), buffer));
 
-                async Task FinishWriteAsync(Task writeTask, byte[] localBuffer)
+                static async Task FinishWriteAsync(Task writeTask, byte[] localBuffer)
                 {
                     try
                     {

src/libraries/System.Private.Xml/src/System/Xml/Xsl/XsltOld/XsltCompileContext.cs

@@ -665,7 +665,7 @@ private static string IteratorToString(XPathNodeIterator it)
                 }
                 else
                 {
-                    return XmlConvert.ToXPathString(argument);
+                    return XmlConvert.ToXPathString(argument)!;
                 }
             }
 

src/libraries/System.Security.Cryptography.Encoding/src/Internal/Cryptography/OidLookup.cs

@@ -136,7 +136,7 @@ static OidLookup()
 
         private static void InitializeLookupDictionaries()
         {
-            void AddEntry(string oid, string primaryFriendlyName, string[]? additionalFriendlyNames = null)
+            static void AddEntry(string oid, string primaryFriendlyName, string[]? additionalFriendlyNames = null)
             {
                 s_oidToFriendlyName.Add(oid, primaryFriendlyName);
                 s_friendlyNameToOid.Add(primaryFriendlyName, oid);