Annotating System.Diagnostics.DiagnosticSource on AOT (#72706)

* Annotating System.Diagnostics.DiagnosticSource on AOT

* FB + enable tests

* FB

* warning message FB

* comment FB2

* Warning message revision to reflect AOT problems at code generation

Author: LakshanF

src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.cs

@@ -20,6 +20,7 @@ public virtual void Dispose() { }
         public virtual System.IDisposable Subscribe(System.IObserver<System.Collections.Generic.KeyValuePair<string, object?>> observer, System.Predicate<string>? isEnabled) { throw null; }
         public override string ToString() { throw null; }
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The type of object being written to DiagnosticSource cannot be discovered statically.")]
+        [System.Diagnostics.CodeAnalysis.RequiresDynamicCode("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
         public override void Write(string name, object? value) { }
     }
     public abstract partial class DiagnosticSource
@@ -28,6 +29,7 @@ protected DiagnosticSource() { }
         public abstract bool IsEnabled(string name);
         public virtual bool IsEnabled(string name, object? arg1, object? arg2 = null) { throw null; }
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The type of object being written to DiagnosticSource cannot be discovered statically.")]
+        [System.Diagnostics.CodeAnalysis.RequiresDynamicCode("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
         public abstract void Write(string name, object? value);
     }
 }

src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <CLSCompliant>false</CLSCompliant>
@@ -15,6 +15,10 @@
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\IsExternalInit.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">
+    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\ref\System.Runtime.csproj" />
   </ItemGroup>

src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs

@@ -197,8 +197,10 @@ public abstract partial class DiagnosticSource
         public virtual void OnActivityExport(System.Diagnostics.Activity activity, object? payload) { }
         public virtual void OnActivityImport(System.Diagnostics.Activity activity, object? payload) { }
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The type of object being written to DiagnosticSource cannot be discovered statically.")]
+        [System.Diagnostics.CodeAnalysis.RequiresDynamicCode("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
         public System.Diagnostics.Activity StartActivity(System.Diagnostics.Activity activity, object? args) { throw null; }
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The type of object being written to DiagnosticSource cannot be discovered statically.")]
+        [System.Diagnostics.CodeAnalysis.RequiresDynamicCode("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
         public void StopActivity(System.Diagnostics.Activity activity, object? args) { }
     }
     public enum ActivitySamplingResult

src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj

@@ -8,6 +8,7 @@
     <IsPackable>true</IsPackable>
     <!-- Lifetime rules introduced in C# 11 impact scenarios in net6 framework -->
     <LangVersion Condition="'$(TargetFramework)' == 'net6.0'">10</LangVersion>
+    <EnableAOTAnalyzer>true</EnableAOTAnalyzer>
     <PackageDescription>Provides Classes that allow you to decouple code logging rich (unserializable) diagnostics/telemetry (e.g. framework) from code that consumes it (e.g. tools)
 
 Commonly Used Types:
@@ -103,6 +104,10 @@ System.Diagnostics.DiagnosticSource</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\IsExternalInit.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))" >
+    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp' or
                         '$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="System\Diagnostics\Activity.DateTime.corefx.cs" />

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/DiagnosticListener.cs

@@ -34,6 +34,8 @@ public partial class DiagnosticListener : DiagnosticSource, IObservable<KeyValue
         /// </summary>
         public static IObservable<DiagnosticListener> AllListeners
         {
+            [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
+               Justification = "ENABLE_HTTP_HANDLER is not enabled in the .NET current version")]
             get
             {
 #if ENABLE_HTTP_HANDLER
@@ -253,6 +255,7 @@ public override bool IsEnabled(string name, object? arg1, object? arg2 = null)
         /// Override abstract method
         /// </summary>
         [RequiresUnreferencedCode(WriteRequiresUnreferencedCode)]
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         public override void Write(string name, object? value)
         {
             for (DiagnosticSubscription? curSubscription = _subscriptions; curSubscription != null; curSubscription = curSubscription.Next)

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/DiagnosticSource.cs

@@ -17,6 +17,7 @@ namespace System.Diagnostics
     public abstract partial class DiagnosticSource
     {
         internal const string WriteRequiresUnreferencedCode = "The type of object being written to DiagnosticSource cannot be discovered statically.";
+        internal const string WriteRequiresDynamicCode = "DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.";
 
         /// <summary>
         /// Write is a generic way of logging complex payloads.  Each notification
@@ -35,6 +36,7 @@ public abstract partial class DiagnosticSource
         /// <param name="value">An object that represent the value being passed as a payload for the event.
         /// This is often an anonymous type which contains several sub-values.</param>
         [RequiresUnreferencedCode(WriteRequiresUnreferencedCode)]
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         public abstract void Write(string name, object? value);
 
         /// <summary>

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/DiagnosticSourceActivity.cs

@@ -26,6 +26,7 @@ public abstract partial class DiagnosticSource
         /// <returns>Started Activity for convenient chaining</returns>
         /// <seealso cref="Activity"/>
         [RequiresUnreferencedCode(WriteRequiresUnreferencedCode)]
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         public Activity StartActivity(Activity activity, object? args)
         {
             activity.Start();
@@ -44,6 +45,7 @@ public Activity StartActivity(Activity activity, object? args)
         /// <param name="args">An object that represent the value being passed as a payload for the event.</param>
         /// <seealso cref="Activity"/>
         [RequiresUnreferencedCode(WriteRequiresUnreferencedCode)]
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         public void StopActivity(Activity activity, object? args)
         {
             // Stop sets the end time if it was unset, but we want it set before we issue the write

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/DiagnosticSourceEventSource.cs

@@ -641,6 +641,8 @@ public FilterAndTransform(string filterAndPayloadSpec, int startIdx, int endIdx,
                         [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2119",
                             Justification = "DAM on EventSource references this compiler-generated local function which calls a " +
                                             "method that requires unreferenced code. EventSource will not access this local function.")]
+                        [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
+                            Justification = "DiagnosticSource.Write is marked with RequiresDynamicCode.")]
                         void OnEventWritten(KeyValuePair<string, object?> evnt)
                         {
                             // The filter given to the DiagnosticSource may not work if users don't is 'IsEnabled' as expected.
@@ -888,6 +890,8 @@ internal static void CreateActivityListener(DiagnosticSourceEventSource eventSou
             [DynamicDependency(nameof(TimeSpan.Ticks), typeof(TimeSpan))]
             [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
                 Justification = "Activity's properties are being preserved with the DynamicDependencies on OnActivityStarted.")]
+            [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
+                            Justification = "Activity is a reference type and is safe in aot.")]
             private static void OnActivityStarted(DiagnosticSourceEventSource eventSource, Activity activity)
             {
                 FilterAndTransform? list = eventSource._activitySourceSpecs;
@@ -907,6 +911,8 @@ private static void OnActivityStarted(DiagnosticSourceEventSource eventSource, A
 
             [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
                 Justification = "Activity's properties are being preserved with the DynamicDependencies on OnActivityStarted.")]
+            [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
+                            Justification = "Activity is a reference type and is safe with aot.")]
             private static void OnActivityStopped(DiagnosticSourceEventSource eventSource, Activity activity)
             {
                 FilterAndTransform? list = eventSource._activitySourceSpecs;
@@ -1009,6 +1015,7 @@ private void Dispose()
                 Justification = "In EventSource, EnsureDescriptorsInitialized's use of GetType preserves this method which " +
                                 "requires unreferenced code, but EnsureDescriptorsInitialized does not access this member and is safe to call.")]
             [RequiresUnreferencedCode(DiagnosticSource.WriteRequiresUnreferencedCode)]
+            [RequiresDynamicCode(DiagnosticSource.WriteRequiresDynamicCode)]
             public List<KeyValuePair<string, string?>> Morph(object? args)
             {
                 // Transform the args into a bag of key-value strings.
@@ -1190,6 +1197,7 @@ public TransformSpec(string transformSpec, int startIdx, int endIdx, TransformSp
                 Justification = "In EventSource, EnsureDescriptorsInitialized's use of GetType preserves this method which " +
                                 "requires unreferenced code, but EnsureDescriptorsInitialized does not access this member and is safe to call.")]
             [RequiresUnreferencedCode(DiagnosticSource.WriteRequiresUnreferencedCode)]
+            [RequiresDynamicCode(DiagnosticSource.WriteRequiresDynamicCode)]
             public KeyValuePair<string, string?> Morph(object? obj)
             {
                 for (PropertySpec? cur = _fetches; cur != null; cur = cur.Next)
@@ -1244,6 +1252,7 @@ public PropertySpec(string propertyName, PropertySpec? next)
                     Justification = "In EventSource, EnsureDescriptorsInitialized's use of GetType preserves this method which " +
                                     "requires unreferenced code, but EnsureDescriptorsInitialized does not access this member and is safe to call.")]
                 [RequiresUnreferencedCode(DiagnosticSource.WriteRequiresUnreferencedCode)]
+                [RequiresDynamicCode(DiagnosticSource.WriteRequiresDynamicCode)]
                 public object? Fetch(object? obj)
                 {
                     PropertyFetch? fetch = _fetchForExpectedType;
@@ -1290,6 +1299,7 @@ public PropertyFetch(Type? type)
                         Justification = "In EventSource, EnsureDescriptorsInitialized's use of GetType preserves this method which " +
                                         "requires unreferenced code, but EnsureDescriptorsInitialized does not access this member and is safe to call.")]
                     [RequiresUnreferencedCode(DiagnosticSource.WriteRequiresUnreferencedCode)]
+                    [RequiresDynamicCode(DiagnosticSource.WriteRequiresDynamicCode)]
                     public static PropertyFetch FetcherForProperty(Type? type, string propertyName)
                     {
                         if (propertyName == null)

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/HttpHandlerDiagnosticListener.cs

@@ -3,6 +3,7 @@
 
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Net;
 using System.Reflection;
 using System.Reflection.Emit;
@@ -24,6 +25,7 @@ namespace System.Diagnostics
     /// when it sees the System.Net.Http.Desktop source, subscribe to it. This will trigger the
     /// initialization of this DiagnosticListener.
     /// </summary>
+    [RequiresDynamicCode(WriteRequiresDynamicCode)]
     internal sealed class HttpHandlerDiagnosticListener : DiagnosticListener
     {
         /// <summary>
@@ -202,6 +204,7 @@ public override void Remove(object key)
         /// intercept each new ServicePoint object being added to ServicePointManager.s_ServicePointTable
         /// and replace its ConnectionGroupList hashtable field.
         /// </summary>
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         private sealed class ServicePointHashtable : HashtableWrapper
         {
             public ServicePointHashtable(Hashtable table) : base(table)
@@ -242,6 +245,7 @@ public override object this[object key]
         /// intercept each new ConnectionGroup object being added to ServicePoint.m_ConnectionGroupList
         /// and replace its m_ConnectionList arraylist field.
         /// </summary>
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         private sealed class ConnectionGroupHashtable : HashtableWrapper
         {
             public ConnectionGroupHashtable(Hashtable table) : base(table)
@@ -481,6 +485,7 @@ public override void TrimToSize()
         /// intercept each new Connection object being added to ConnectionGroup.m_ConnectionList
         /// and replace its m_WriteList arraylist field.
         /// </summary>
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         private sealed class ConnectionArrayList : ArrayListWrapper
         {
             public ConnectionArrayList(ArrayList list) : base(list)
@@ -511,6 +516,7 @@ public override int Add(object value)
         /// It also intercepts all HttpWebRequest objects that are about to get removed from
         /// Connection.m_WriteList as they have completed the request.
         /// </summary>
+        [RequiresDynamicCode(WriteRequiresDynamicCode)]
         private sealed class HttpWebRequestArrayList : ArrayListWrapper
         {
             public HttpWebRequestArrayList(ArrayList list) : base(list)

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/AggregationManager.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.Versioning;
 using System.Security;
 using System.Threading;
@@ -249,6 +250,8 @@ private void RemoveInstrumentState(Instrument instrument, InstrumentState state)
             return instrumentState;
         }
 
+        [UnconditionalSuppressMessage("AotAnalysis", "IL3050:RequiresDynamicCode",
+                        Justification = "MakeGenericType is creating instances over reference types that works fine in AOT.")]
         internal InstrumentState? BuildInstrumentState(Instrument instrument)
         {
             Func<Aggregator?>? createAggregatorFunc = GetAggregatorFactory(instrument);