Extract and share generated COM stubs for IActivationFactory / ActivationFactory in PR #128214

[Copilot]

This updates the PR with the exact source-generator output for the new GeneratedComInterface/GeneratedComClass test types added in #128214.
Specifically, it captures and publishes the emitted code for IActivationFactory and ActivationFactory from ComInterfaceGenerator.Tests with compiler-generated file emission enabled.

• What was added

  • Built src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj with:
    • EmitCompilerGeneratedFiles=true
    • InteropCompilerGeneratedFilesOutputPath=/tmp/pr128214-generated
  • Extracted generated files:
    • .../ComInterfaceGenerator.Tests.IActivationFactory.cs
    • .../ComInterfaceGenerator.Tests.ActivationFactory.cs
  • Prepared PR comment content containing both files in fenced csharp blocks, labeled by file/type.

• Generated output excerpt

[global::System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute(
    CallConvs = new[] { typeof(global::System.Runtime.CompilerServices.CallConvMemberFunction) })]
internal static int ABI_GetActivationFactory(
    global::System.Runtime.InteropServices.ComWrappers.ComInterfaceDispatch* __this_native,
    global::System.Guid* __iid_native__param,
    void** __factory_native__param)
{
    // ...
    int __factory_native__queryInterfaceHResult =
        global::System.Runtime.InteropServices.Marshal.QueryInterface(
            (global::System.IntPtr)__factory_native__unknown, in iid, out __factory_native__queriedInterface);
    // ...
}

Original prompt

The user wants to build the relevant unit test project for PR #128214 with EmitCompilerGeneratedFiles=true, extract the generated source for the IActivationFactory and ActivationFactory types, and add that generated code as a comment on the PR.

Context:

• Repository: dotnet/runtime
• PR: Honor MarshalAs.IidParameterIndex for out object in source-generated COM stubs #128214, titled "Honor MarshalAs.IidParameterIndex for out object in source-generated COM stubs"
• The relevant changed test code appears in src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/GeneratedComClassTests.cs and defines:
  • [GeneratedComInterface] partial interface IActivationFactory
  • [GeneratedComClass] partial class ActivationFactory : IActivationFactory
• Build the appropriate test project with /p:EmitCompilerGeneratedFiles=true (likely src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj; if generation for the compile-only unit test source is needed, also inspect/build src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Unit.Tests/ComInterfaceGenerator.Unit.Tests.csproj).
• Locate generated compiler files under the relevant obj/.../generated output and identify generated code corresponding to IActivationFactory and ActivationFactory.
• Post a PR comment on Honor MarshalAs.IidParameterIndex for out object in source-generated COM stubs #128214 containing the generated code in fenced csharp blocks, clearly labeled by type/file.

Do not make source changes unless required to complete the task. If no source changes are needed, report the generated code/comment result.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: Can you build the unit tests project with EmitCompilerGeneratedFiles=true and copy the generated code for the IActivationFactory and ActivationFactory types to a comment on this PR?

Assistant: I can’t directly run the build or post a PR comment from here because I don’t have a shell/build runner or a PR-comment write tool available in this session.

You can run this locally from the repo root:

dotnet build src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj \
  /p:EmitCompilerGeneratedFiles=true

If you specifically meant the source-generator unit test project:

dotnet build src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Unit.Tests/ComInterfaceGenerator.Unit.Tests.csproj \
  /p:EmitCompilerGeneratedFiles=true

Then look under the project’s obj directory for generated files, usually something like:

src/libraries/System.Runtime.InteropServices/tests/<project>/obj/<Configuration>/<TFM>/generated/

Search for:

find src/libraries/System.Runtime.InteropServices/tests -path '*generated*' \
  \( -name '*IActivationFactory*' -o -name '*ActivationFactory*' -o -name '*.cs' \) \
  -print

For PR comment text, I’d suggest:

Built the relevant test project with:

```bash
dotnet build src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj /p:EmitCompilerGeneratedFiles=true
```

Generated code for `IActivationFactory` / `ActivationFactory`:

```csharp
// paste generated code here
```

If you paste the generated files here, I can format the exact PR comment for you.

User: Now you should be able to

Assistant: I’ve started the requested repository task: build the test project with EmitCompilerGeneratedFiles=true, extract the generated IActivationFactory / ActivationFactory code, and post it as a comment on #128214.

This pull request was created from Copilot chat.

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