Updated InProcessNoEmitToolchain to match behavior of other toolchains. (#2315)

Added support for pointer, ByRef, ValueTask, and ref struct returns.
Added benchmark validation.

Author: timcassell

src/BenchmarkDotNet/BenchmarkDotNet.csproj

@@ -2,7 +2,7 @@
   <Import Project="..\..\build\common.props" />
   <PropertyGroup>
     <AssemblyTitle>BenchmarkDotNet</AssemblyTitle>
-    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0;net9.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <NoWarn>$(NoWarn);1701;1702;1705;1591;3005;NU1702;CS3001;CS3003</NoWarn>
     <AssemblyName>BenchmarkDotNet</AssemblyName>

src/BenchmarkDotNet/Extensions/ReflectionExtensions.cs

@@ -211,9 +211,7 @@ internal static bool IsStackOnlyWithImplicitCast(this Type argumentType, object?
             if (argumentInstance == null)
                 return false;
 
-            // IsByRefLikeAttribute is not exposed for older runtimes, so we need to check it in an ugly way ;)
-            bool isByRefLike = argumentType.GetCustomAttributes().Any(attribute => attribute.ToString()?.Contains("IsByRefLike") ?? false);
-            if (!isByRefLike)
+            if (!argumentType.IsByRefLike())
                 return false;
 
             var instanceType = argumentInstance.GetType();
@@ -235,5 +233,13 @@ private static bool IsRunnableGenericType(TypeInfo typeInfo)
                     && typeInfo.DeclaredConstructors.Any(ctor => ctor.IsPublic && ctor.GetParameters().Length == 0); // we need public parameterless ctor to create it
 
         internal static bool IsLinqPad(this Assembly assembly) => assembly.FullName.IndexOf("LINQPAD", StringComparison.OrdinalIgnoreCase) >= 0;
+
+        internal static bool IsByRefLike(this Type type)
+#if NETSTANDARD2_0
+            // Type.IsByRefLike is not available in netstandard2.0.
+            => type.IsValueType && type.CustomAttributes.Any(attr => attr.AttributeType.FullName == "System.Runtime.CompilerServices.IsByRefLikeAttribute");
+#else
+            => type.IsByRefLike;
+#endif
     }
 }

src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

@@ -150,6 +150,12 @@ protected void GatherReferences(string projectFilePath, BuildPartition buildPart
                 // TODO: Add Aliases here for extern alias #2289
             }
 
+            // Mono80IsSupported test fails when BenchmarkDotNet is restored for net9.0 if we don't remove the ProjectReference.
+            if (XUnitHelper.IsIntegrationTest.Value)
+            {
+                projectElement.RemoveChild(projectElement.SelectSingleNode("ItemGroup/ProjectReference").ParentNode);
+            }
+
             xmlDoc.Save(artifactsPaths.ProjectFilePath);
 
             BuildResult BuildProject(string tfm)

src/BenchmarkDotNet/Toolchains/InProcess/NoEmit/BenchmarkAction.cs

@@ -1,12 +1,9 @@
 using System;
 
-using JetBrains.Annotations;
-
 namespace BenchmarkDotNet.Toolchains.InProcess.NoEmit
 {
     /// <summary>Common API to run the Setup/Clean/Idle/Run methods</summary>
-    [PublicAPI]
-    public abstract class BenchmarkAction
+    internal abstract class BenchmarkAction
     {
         /// <summary>Gets or sets invoke single callback.</summary>
         /// <value>Invoke single callback.</value>
@@ -16,9 +13,5 @@ public abstract class BenchmarkAction
         /// <value>Invoke multiple times callback.</value>
         public Action<long> InvokeUnroll { get; protected set; }
         public Action<long> InvokeNoUnroll{ get; protected set; }
-
-        /// <summary>Gets the last run result.</summary>
-        /// <value>The last run result.</value>
-        public virtual object LastRunResult => null;
     }
 }

src/BenchmarkDotNet/Toolchains/InProcess/NoEmit/BenchmarkActionFactory.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
@@ -9,27 +10,47 @@
 namespace BenchmarkDotNet.Toolchains.InProcess.NoEmit
 {
     /// <summary>Helper class that creates <see cref="BenchmarkAction"/> instances. </summary>
-    public static partial class BenchmarkActionFactory
+    internal static partial class BenchmarkActionFactory
     {
         /// <summary>
         /// Dispatch method that creates <see cref="BenchmarkAction"/> using
         /// <paramref name="targetMethod"/> or <paramref name="fallbackIdleSignature"/> to find correct implementation.
         /// Either <paramref name="targetMethod"/> or <paramref name="fallbackIdleSignature"/> should be not <c>null</c>.
         /// </summary>
-        private static BenchmarkAction CreateCore(
-            object instance,
-            MethodInfo? targetMethod,
-            MethodInfo? fallbackIdleSignature,
-            int unrollFactor)
+        private static BenchmarkAction CreateCore(object instance, MethodInfo? targetMethod, MethodInfo? fallbackIdleSignature, int unrollFactor)
         {
             PrepareInstanceAndResultType(instance, targetMethod, fallbackIdleSignature, out var resultInstance, out var resultType);
 
             if (resultType == typeof(void))
                 return new BenchmarkActionVoid(resultInstance, targetMethod, unrollFactor);
 
+            if (resultType == typeof(void*))
+                return new BenchmarkActionVoidPointer(resultInstance, targetMethod, unrollFactor);
+
+            if (resultType.IsByRef)
+            {
+                var returnParameter = targetMethod?.ReturnParameter ?? fallbackIdleSignature.ReturnParameter;
+                // IsReadOnlyAttribute is not part of netstandard2.0, so we need to check the attribute name as usual.
+                if (returnParameter.GetCustomAttributes().Any(attribute => attribute.GetType().FullName == "System.Runtime.CompilerServices.IsReadOnlyAttribute"))
+                    return Create(
+                        typeof(BenchmarkActionByRefReadonly<>).MakeGenericType(resultType.GetElementType()),
+                        resultInstance,
+                        targetMethod,
+                        unrollFactor);
+
+                return Create(
+                    typeof(BenchmarkActionByRef<>).MakeGenericType(resultType.GetElementType()),
+                    resultInstance,
+                    targetMethod,
+                    unrollFactor);
+            }
+
             if (resultType == typeof(Task))
                 return new BenchmarkActionTask(resultInstance, targetMethod, unrollFactor);
 
+            if (resultType == typeof(ValueTask))
+                return new BenchmarkActionValueTask(resultInstance, targetMethod, unrollFactor);
+
             if (resultType.GetTypeInfo().IsGenericType)
             {
                 var genericType = resultType.GetGenericTypeDefinition();
@@ -49,10 +70,6 @@ private static BenchmarkAction CreateCore(
                         unrollFactor);
             }
 
-            if (targetMethod == null && resultType.GetTypeInfo().IsValueType)
-                // for Idle: we return int because creating bigger ValueType could take longer than benchmarked method itself.
-                resultType = typeof(int);
-
             return Create(
                 typeof(BenchmarkAction<>).MakeGenericType(resultType),
                 resultInstance,
@@ -86,6 +103,10 @@ private static void PrepareInstanceAndResultType(
                 if (isUsingAsyncKeyword)
                     throw new NotSupportedException("Async void is not supported by design.");
             }
+            else if (resultType.IsPointer && resultType != typeof(void*))
+            {
+                throw new NotSupportedException("InProcessNoEmitToolchain only supports void* return, not T*");
+            }
         }
 
         /// <summary>Helper to enforce .ctor signature.</summary>
@@ -109,7 +130,7 @@ public static BenchmarkAction CreateWorkload(Descriptor descriptor, object insta
         /// <param name="unrollFactor">Unroll factor.</param>
         /// <returns>Idle benchmark action.</returns>
         public static BenchmarkAction CreateOverhead(Descriptor descriptor, object instance, int unrollFactor) =>
-            CreateCore(instance, null, descriptor.WorkloadMethod, unrollFactor);
+            CreateCore(instance, null, FallbackSignature, unrollFactor);
 
         /// <summary>Creates global setup benchmark action.</summary>
         /// <param name="descriptor">Descriptor info.</param>

src/BenchmarkDotNet/Toolchains/InProcess/NoEmit/BenchmarkActionFactory_Base.cs

@@ -20,9 +20,7 @@ 5. Implementation should match to the code in BenchmarkProgram.txt.
 
     // DONTTOUCH: Be VERY CAREFUL when changing the code.
     // Please, ensure that the implementation is in sync with content of BenchmarkProgram.txt
-
-    /// <summary>Helper class that creates <see cref="BenchmarkAction"/> instances. </summary>
-    public static partial class BenchmarkActionFactory
+    internal static partial class BenchmarkActionFactory
     {
         /// <summary>Base class that provides reusable API for final implementations.</summary>
         internal abstract class BenchmarkActionBase : BenchmarkAction
@@ -35,19 +33,15 @@ protected static TDelegate CreateWorkload<TDelegate>(object? targetInstance, Met
                 return (TDelegate)(object)workloadMethod.CreateDelegate(typeof(TDelegate), targetInstance);
             }
 
-            protected static TDelegate CreateWorkloadOrOverhead<TDelegate>(
-                object? targetInstance,
-                MethodInfo? workloadMethod,
-                TDelegate overheadStaticCallback,
-                TDelegate overheadInstanceCallback) where TDelegate : notnull
+            protected Action CreateWorkloadOrOverhead(object? instance, MethodInfo? method)
             {
-                if (workloadMethod == null)
-                    return targetInstance == null ? overheadStaticCallback : overheadInstanceCallback;
-
-                if (workloadMethod.IsStatic)
-                    return (TDelegate)(object)workloadMethod.CreateDelegate(typeof(TDelegate));
-
-                return (TDelegate)(object)workloadMethod.CreateDelegate(typeof(TDelegate), targetInstance);
+                if (method == null)
+                {
+                    return instance == null ? OverheadStatic : OverheadInstance;
+                }
+                return method.IsStatic
+                    ? (Action) method.CreateDelegate(typeof(Action))
+                    : (Action) method.CreateDelegate(typeof(Action), instance);
             }
 
             protected static TDelegate Unroll<TDelegate>(TDelegate callback, int unrollFactor)
@@ -61,6 +55,11 @@ protected static TDelegate Unroll<TDelegate>(TDelegate callback, int unrollFacto
                 return (TDelegate)(object)Delegate.Combine(
                     Enumerable.Repeat((Delegate)(object)callback, unrollFactor).ToArray());
             }
+
+            // must be kept in sync with VoidDeclarationsProvider.IdleImplementation
+            private static void OverheadStatic() { }
+
+            private void OverheadInstance() { }
         }
     }
 }