Add Benchmarks project. (#538)

Directory.Build.props

@@ -7,7 +7,7 @@
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
     <DebugType>embedded</DebugType>
     <DebugSymbols>true</DebugSymbols>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>9</LangVersion>
     <IsPackable>true</IsPackable>
 
     <!-- Set this property to false if you don't want to use the runtime

DllImportGenerator/.gitignore

@@ -1,4 +1,5 @@
 .vs/
 **/bin
 **/obj
-*.binlog
+*.binlog
+BenchmarkDotNet.Artifacts

DllImportGenerator/Benchmarks/Benchmarks.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Ancillary.Interop\Ancillary.Interop.csproj" />
+    <ProjectReference Include="..\DllImportGenerator\DllImportGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <ProjectReference Include="..\TestAssets\NativeExports\NativeExports.csproj" />
+    <ProjectReference Include="..\TestAssets\SharedTypes\SharedTypes.csproj" />
+  </ItemGroup>
+
+</Project>

DllImportGenerator/Benchmarks/BlittableTypes.cs

@@ -0,0 +1,40 @@
+using BenchmarkDotNet.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Benchmarks
+{
+    partial class NativeExportsNE
+    {
+        public const string NativeExportsNE_Binary = "Microsoft.Interop.Tests." + nameof(NativeExportsNE);
+
+        [GeneratedDllImport(NativeExportsNE_Binary, EntryPoint = "sumi")]
+        public static partial int Sum(int a, int b);
+
+        [GeneratedDllImport(NativeExportsNE_Binary, EntryPoint = "sumouti")]
+        public static partial void Sum(int a, int b, out int c);
+
+        [GeneratedDllImport(NativeExportsNE_Binary, EntryPoint = "sumrefi")]
+        public static partial void Sum(int a, ref int b);
+    }
+
+    public class BlittableTypes
+    {
+        [Benchmark]
+        public int IntByValue()
+        {
+            return NativeExportsNE.Sum(3, 42);
+        }
+
+        [Benchmark]
+        public int IntOutByRef()
+        {
+            NativeExportsNE.Sum(3, 42, out int result);
+            return result;
+        }
+    }
+}

DllImportGenerator/Benchmarks/Program.cs

@@ -0,0 +1,77 @@
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.Environments;
+using BenchmarkDotNet.Jobs;
+using BenchmarkDotNet.Loggers;
+using BenchmarkDotNet.Running;
+using BenchmarkDotNet.Toolchains;
+using BenchmarkDotNet.Toolchains.CsProj;
+using BenchmarkDotNet.Toolchains.DotNetCli;
+using BenchmarkDotNet.Toolchains.Results;
+using System;
+
+namespace Benchmarks
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var config = DefaultConfig.Instance
+                .AddJob(GetDefaultJob())
+                .AddJob(GetForwarderJob())
+                .AddDiagnoser(MemoryDiagnoser.Default);
+
+            BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args, config);
+        }
+
+        private static Job GetDefaultJob()
+        {
+            var settings = NetCoreAppSettings.NetCoreApp50;
+
+            return Job.Default.WithToolchain(new Toolchain(".NET 6.0",
+                new CsProjGenerator(settings.TargetFrameworkMoniker, settings.CustomDotNetCliPath, settings.PackagesPath, "$(MicrosoftNETCoreAppVersion)"),
+                new DotNetCliBuilder(settings.TargetFrameworkMoniker, settings.CustomDotNetCliPath, settings.Timeout),
+                new DotNetCliExecutor(settings.CustomDotNetCliPath)))
+                .WithId("Generated");
+        }
+
+        private static Job GetForwarderJob()
+        {
+            var settings = NetCoreAppSettings.NetCoreApp50;
+            return Job.Default
+                .WithToolchain(new Toolchain(".NET 6.0 with Forwarders",
+                     new CsProjGenerator(settings.TargetFrameworkMoniker, settings.CustomDotNetCliPath, settings.PackagesPath, "$(MicrosoftNETCoreAppVersion)"),
+                    new GenerateForwarderBuilder(settings),
+                   new DotNetCliExecutor(settings.CustomDotNetCliPath)))
+                .WithId("Built-in")
+                .AsBaseline();
+        }
+    }
+
+    internal class GenerateForwarderBuilder : IBuilder
+    {
+        private TimeSpan Timeout { get; }
+
+        private string TargetFrameworkMoniker { get; }
+
+        private string CustomDotNetCliPath { get; }
+
+        public GenerateForwarderBuilder(NetCoreAppSettings settings)
+        {
+            TargetFrameworkMoniker = settings.TargetFrameworkMoniker;
+            CustomDotNetCliPath = settings.CustomDotNetCliPath;
+            Timeout = settings.Timeout;
+        }
+
+        public BuildResult Build(GenerateResult generateResult, BuildPartition buildPartition, ILogger logger)
+            => new DotNetCliCommand(
+                    CustomDotNetCliPath,
+                    "/p:DllImportGenerator_GenerateForwarders=true",
+                    generateResult,
+                    logger,
+                    buildPartition,
+                    Array.Empty<EnvironmentVariable>(),
+                    Timeout)
+                .RestoreThenBuild();
+    }
+}

DllImportGenerator/DllImportGenerator.sln

@@ -25,6 +25,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SharedTypes", "TestAssets\S
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "TestAssets", "TestAssets", "{C7134A89-8852-4FBE-B426-EFE007C4A819}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Benchmarks", "Benchmarks\Benchmarks.csproj", "{0914590B-C47A-4754-A7BE-E4CD843A92E4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -67,6 +69,10 @@ Global
 		{D42D99E6-DA2B-48D5-BEED-F093A8E600BE}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D42D99E6-DA2B-48D5-BEED-F093A8E600BE}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D42D99E6-DA2B-48D5-BEED-F093A8E600BE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0914590B-C47A-4754-A7BE-E4CD843A92E4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0914590B-C47A-4754-A7BE-E4CD843A92E4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0914590B-C47A-4754-A7BE-E4CD843A92E4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0914590B-C47A-4754-A7BE-E4CD843A92E4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE