PoC for memory benchmark

ILSpy.Benchmarks.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34004.107
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ILSpy.Benchmarks", "ILSpy.Benchmarks\ILSpy.Benchmarks.csproj", "{67E4B874-948E-4649-B8B5-4B2ED14C4019}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ICSharpCode.Decompiler", "ICSharpCode.Decompiler\ICSharpCode.Decompiler.csproj", "{92CEF45B-D9B8-4F3B-957A-FF74E2D8415B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{67E4B874-948E-4649-B8B5-4B2ED14C4019}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{67E4B874-948E-4649-B8B5-4B2ED14C4019}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{67E4B874-948E-4649-B8B5-4B2ED14C4019}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{67E4B874-948E-4649-B8B5-4B2ED14C4019}.Release|Any CPU.Build.0 = Release|Any CPU
+		{92CEF45B-D9B8-4F3B-957A-FF74E2D8415B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{92CEF45B-D9B8-4F3B-957A-FF74E2D8415B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{92CEF45B-D9B8-4F3B-957A-FF74E2D8415B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{92CEF45B-D9B8-4F3B-957A-FF74E2D8415B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F1EFB7E1-D81D-4E24-BD70-A2D313D4FB8F}
+	EndGlobalSection
+EndGlobal

ILSpy.Benchmarks/ILSpy.Benchmarks.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.7" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.13.7" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ICSharpCode.Decompiler\ICSharpCode.Decompiler.csproj" />
+  </ItemGroup>
+
+</Project>

ILSpy.Benchmarks/Program.cs

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+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Diagnostics.Windows.Configs;
+
+using ICSharpCode.Decompiler.CSharp;
+using ICSharpCode.Decompiler;
+
+using ICSharpCode.Decompiler.TypeSystem;
+using BenchmarkDotNet.Running;
+
+namespace ILSpy.Benchmarks
+{
+	[ShortRunJob]
+	// [NativeMemoryProfiler] // needs elevation, see also https://benchmarkdotnet.org/articles/configs/diagnosers.html#sample-intronativememory
+	[MemoryDiagnoser]
+	public class DecompilerBenchmarks
+	{
+		/*
+		|              Method |     Mean |    Error |   StdDev |      Gen0 |     Gen1 |     Gen2 | Allocated |
+		|-------------------- |---------:|---------:|---------:|----------:|---------:|---------:|----------:|
+		| SimpleDecompilation | 46.69 ms | 26.13 ms | 1.432 ms | 2090.9091 | 909.0909 | 272.7273 |  15.33 MB | 
+		*/
+		[Benchmark]
+		public void SimpleDecompilation()
+		{
+			string testAssemblyPath = typeof(CSharpDecompiler).Assembly.Location;
+			var decompiler = new CSharpDecompiler(testAssemblyPath, new DecompilerSettings());
+
+			// ICSharpCode.Decompiler.Util.Empty<T> -> translates to `n, where n is the # of generic parameters
+			var nameOfGenericType = new FullTypeName("ICSharpCode.Decompiler.Util.Empty`1");
+			string decompiledStuff = decompiler.DecompileTypeAsString(nameOfGenericType);
+
+			//var nameOfUniResolver = new FullTypeName("ICSharpCode.Decompiler.Metadata.UniversalAssemblyResolver");
+			//ITypeDefinition typeInfo = decompiler.TypeSystem.FindType(nameOfUniResolver).GetDefinition();
+			//var tokenOfFirstMethod = typeInfo.Methods.First().MetadataToken;
+			//decompiledStuff = decompiler.DecompileAsString(tokenOfFirstMethod);
+		}
+	}
+
+	internal class Program
+	{
+		static void Main(string[] args)
+		{
+			var summary = BenchmarkRunner.Run(typeof(Program).Assembly);
+		}
+	}
+}