Add runtime location to host log (#3806)

Add runtime location to host log

Author: MarcoRossignoli

src/testhost.x86/DefaultEngineInvoker.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.IO;
 using System.Net;
 using System.Reflection;
 using System.Threading;
@@ -100,7 +101,16 @@ public void Invoke(IDictionary<string, string?> argsDictionary)
                 .GetTypeInfo()
                 .Assembly
                 .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion;
-            EqtTrace.Verbose($"Version: {version}");
+            EqtTrace.Verbose($"Version: {version} Current process architecture: {_processHelper.GetCurrentProcessArchitecture()}");
+#if NETCOREAPP2_0_OR_GREATER || NETFRAMEWORK
+            // https://docs.microsoft.com/en-us/dotnet/api/system.reflection.assembly.location?view=net-6.0#remarks
+            // In .NET 5 and later versions, for bundled assemblies, the value returned is an empty string.
+            string objectTypeLocation = typeof(object).Assembly.Location;
+            if (!objectTypeLocation.IsNullOrEmpty())
+            {
+                EqtTrace.Verbose($"Runtime location: {Path.GetDirectoryName(objectTypeLocation)}");
+            }
+#endif
         }
 
         if (EqtTrace.IsInfoEnabled)

src/vstest.console/Processors/EnableDiagArgumentProcessor.cs

@@ -138,6 +138,13 @@ public void Initialize(string? argument)
         // Write version to the log here, because that is the
         // first place where we know if we log or not.
         EqtTrace.Verbose($"Version: {Product.Version} Current process architecture: {_processHelper.GetCurrentProcessArchitecture()}");
+        // https://docs.microsoft.com/en-us/dotnet/api/system.reflection.assembly.location?view=net-6.0#remarks
+        // In .NET 5 and later versions, for bundled assemblies, the value returned is an empty string.
+        string objectTypeLocation = typeof(object).Assembly.Location;
+        if (!objectTypeLocation.IsNullOrEmpty())
+        {
+            EqtTrace.Verbose($"Runtime location: {Path.GetDirectoryName(objectTypeLocation)}");
+        }
     }
 
     /// <summary>