Fix running tests against our DNNE'd NativeExports project to work in…

… NativeAOT (#84578)

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeHelpers.NativeAot.cs

@@ -274,7 +274,7 @@ public static unsafe IntPtr AllocateTypeAssociatedMemory(Type type, int size)
             ArgumentOutOfRangeException.ThrowIfNegative(size);
 
             // We don't support unloading; the memory will never be freed.
-            return (IntPtr)NativeMemory.Alloc((uint)size);
+            return (IntPtr)NativeMemory.AllocZeroed((uint)size);
         }
 
         public static void PrepareDelegate(Delegate d)

src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj

@@ -7,8 +7,7 @@
     <EnableLibraryImportGenerator>true</EnableLibraryImportGenerator>
     <!-- These tests pull the attributes from Ancillary.Interop, so we don't need to include the attribute sources in this assembly. -->
     <IncludeLibraryImportGeneratorSources>false</IncludeLibraryImportGeneratorSources>
-    <!-- suppress warning when referencing architecture specific NativeExports.csproj -->
-    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
+    <ReferencesNativeExports>true</ReferencesNativeExports>
   </PropertyGroup>
 
   <ItemGroup>

src/libraries/System.Runtime.InteropServices/tests/Directory.Build.targets

@@ -0,0 +1,12 @@
+<Project>
+  <PropertyGroup Condition="'$(ReferencesNativeExports)' == 'true'">
+    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
+    <IlcExportUnmanagedEntrypoints>true</IlcExportUnmanagedEntrypoints>
+  </PropertyGroup>
+  <!-- Expose unmanaged entry points from NativeExports -->
+  <ItemGroup Condition="'$(ReferencesNativeExports)' == 'true'">
+    <UnmanagedEntryPointsAssembly Include="Microsoft.Interop.Tests.NativeExports" />
+    <DirectPInvoke Include="Microsoft.Interop.Tests.NativeExportsNE" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />
+</Project>

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/LibraryImportGenerator.Tests.csproj

@@ -1,17 +1,17 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <EnableLibraryImportGenerator>true</EnableLibraryImportGenerator>
     <IncludeLibraryImportGeneratorSources>false</IncludeLibraryImportGeneratorSources>
-    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
+    <ReferencesNativeExports>true</ReferencesNativeExports>
   </PropertyGroup>
 
   <ItemGroup>
     <Compile Include="$(CommonPath)DisableRuntimeMarshalling.cs"
              Link="Common\DisableRuntimeMarshalling.cs" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <ProjectReference Include="..\Ancillary.Interop\Ancillary.Interop.csproj" />
     <ProjectReference Include="..\TestAssets\NativeExports\NativeExports.csproj" />

src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeHelpersTests.cs

@@ -370,10 +370,12 @@ public static void AllocateTypeAssociatedMemoryInvalidArguments()
 
         [Fact]
         [SkipOnMono("Not presently implemented on Mono")]
-        public static void AllocateTypeAssociatedMemoryValidArguments()
+        public static unsafe void AllocateTypeAssociatedMemoryValidArguments()
         {
             IntPtr memory = RuntimeHelpers.AllocateTypeAssociatedMemory(typeof(RuntimeHelpersTests), 32);
             Assert.NotEqual(memory, IntPtr.Zero);
+            // Validate that the memory is zeroed out
+            Assert.True(new Span<byte>((void*)memory, 32).SequenceEqual(new byte[32]));
         }
 
         [StructLayoutAttribute(LayoutKind.Sequential)]

src/libraries/tests.proj

@@ -453,11 +453,9 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.InteropServices.JavaScript\tests\JSImportGenerator.UnitTest\JSImportGenerator.Unit.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)Microsoft.Extensions.Configuration.Binder\tests\SourceGenerationTests\Microsoft.Extensions.Configuration.Binder.SourceGeneration.Tests.csproj" />
 
-    <!-- Depends on DNNE. Not particularly interesting because it tests marshalling-less p/invoke only. Low priority -->
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.InteropServices\tests\LibraryImportGenerator.Tests\LibraryImportGenerator.Tests.csproj" />
-
-    <!-- Depends on DNNE -->
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.InteropServices\tests\ComInterfaceGenerator.Tests\ComInterfaceGenerator.Tests.csproj" />
+    <!-- Depends on ComWrappers, which is not enabled on NativeAOT on non-Windows. Tracked by #76005 -->
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.InteropServices\tests\ComInterfaceGenerator.Tests\ComInterfaceGenerator.Tests.csproj"
+      Condition="'$(TargetOS)' != 'windows'" />
 
     <!-- Many test failures due to trimming and MakeGeneric. XmlSerializer is not currently supported with NativeAOT. Low priority -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)Microsoft.XmlSerializer.Generator\tests\Microsoft.XmlSerializer.Generator.Tests.csproj" />