1 files changed, 72 insertions, 0 deletions
diff --git a/test/Mono.Linker.Tests/TestCasesRunner/ILCompiler.cs b/test/Mono.Linker.Tests/TestCasesRunner/ILCompiler.cs
new file mode 100644
index 000000000..517bcb273
--- /dev/null
+++ b/test/Mono.Linker.Tests/TestCasesRunner/ILCompiler.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using Mono.Linker.Tests.Extensions;
+using NUnit.Framework;
+
+namespace Mono.Linker.Tests.TestCasesRunner {
+	public class ILCompiler {
+		private readonly string _ilasmExecutable;
+
+		public ILCompiler ()
+		{
+			_ilasmExecutable = Environment.OSVersion.Platform == PlatformID.Win32NT ? LocateIlasmOnWindows ().ToString () : "ilasm";
+		}
+
+		public ILCompiler (string ilasmExecutable)
+		{
+			_ilasmExecutable = ilasmExecutable;
+		}
+
+		public NPath Compile (CompilerOptions options)
+		{
+			var capturedOutput = new List<string> ();
+			var process = new Process ();
+			SetupProcess (process, options);
+			process.StartInfo.RedirectStandardOutput = true;
+			process.OutputDataReceived += (sender, args) => capturedOutput.Add (args.Data);
+			process.Start ();
+			process.BeginOutputReadLine ();
+			process.WaitForExit ();
+
+			if (process.ExitCode != 0)
+			{
+				Assert.Fail($"Failed to compile IL assembly : {options.OutputPath}\n{capturedOutput.Aggregate ((buff, s) => buff + Environment.NewLine + s)}");
+			}
+
+			return options.OutputPath;
+		}
+
+		protected virtual void SetupProcess (Process process, CompilerOptions options)
+		{
+			process.StartInfo.FileName = _ilasmExecutable;
+			process.StartInfo.Arguments = BuildArguments (options);
+			process.StartInfo.UseShellExecute = false;
+			process.StartInfo.CreateNoWindow = true;
+			process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
+		}
+
+		private string BuildArguments (CompilerOptions options)
+		{
+			var args = new StringBuilder();
+			args.Append(options.OutputPath.ExtensionWithDot == ".dll" ? "/dll" : "/exe");
+			args.Append($" /out:{options.OutputPath.InQuotes ()}");
+			args.Append($" {options.SourceFiles.Aggregate (string.Empty, (buff, file) => $"{buff} {file.InQuotes ()}")}");
+			return args.ToString ();
+		}
+
+		public static NPath LocateIlasmOnWindows ()
+		{
+			if (Environment.OSVersion.Platform != PlatformID.Win32NT)
+				throw new InvalidOperationException ("This method should only be called on windows");
+
+			var possiblePath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory ().ToNPath ().Combine ("ilasm.exe");
+			if (possiblePath.FileExists ())
+				return possiblePath;
+
+			throw new InvalidOperationException ("Could not locate a ilasm.exe executable");
+		}
+	}
+}