[tools] Add a new 'trimmable-static' registrar, that uses trimmable type maps. Fixes #23108. by rolfbjarne · Pull Request #25079 · dotnet/macios

rolfbjarne · 2026-04-03T10:03:11Z

TODO:

Update this description with more TODOs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

This PR introduces a new trimmable-static registrar mode that leverages .NET “Interop Type Maps” to support trimmable registrations, wiring the new mode through the linker, runtime, MSBuild targets, and test variations.

Changes:

Add a new linker step (TrimmableRegistrarStep) that emits type-map assemblies/attributes used for type mapping and proxy lookup.
Extend runtime + native runtime flags and lookup paths to support trimmable-static, including proxy-attribute based construction and unmanaged entrypoint lookup fallback.
Add new build/test plumbing (MSBuild properties, runtimeconfig host options, xharness variations) to exercise the new registrar mode.

Reviewed changes

Copilot reviewed 37 out of 37 changed files in this pull request and generated 17 comments.

Show a summary per file

File	Description
tools/dotnet-linker/Steps/TrimmableRegistrarStep.cs	New linker step that generates typemap assemblies and proxy attribute types/mappings.
tools/dotnet-linker/Steps/RegistrarStep.cs	Treat `TrimmableStatic` similarly to managed-static in registrar output flow.
tools/dotnet-linker/Steps/ManagedRegistrarStep.cs	Enable managed-registrar step for `trimmable-static` to generate UCO trampolines.
tools/dotnet-linker/LinkerConfiguration.cs	Add EntryAssembly helper and new linker config values for typemap output/name.
tools/dotnet-linker/CecilExtensions.cs	Add `TryFindSingle` helper for Cecil collections.
tools/dotnet-linker/AppBundleRewriter.cs	Add typemap-related Cecil lookups and System.Console assembly support.
tools/dotnet-linker/.vscode/launch.json	Adds a VS Code launcher configuration for debugging the linker.
tools/common/Target.cs	Emit a runtime flag indicating trimmable-static registrar usage.
tools/common/StaticRegistrar.cs	Adjust static registrar generation for trimmable-static and extend dlsym signature usage.
tools/common/Optimizations.cs	Allow static-registrar-related optimizations for `trimmable-static`.
tools/common/Assembly.cs	Treat trimmable-static like other static registrar modes for -force_load decisions.
tools/common/Application.cs	Add RegistrarMode value + parsing + typemap config values.
tests/xharness/Jenkins/TestVariationsFactory.cs	Add CI variations for trimmable-static registrar.
tests/monotouch-test/Foundation/StringTest.cs	Adds extra logging in a test case (currently noisy).
tests/monotouch-test/dotnet/shared.csproj	Notes/placeholder for enabling trimmable-static registrar in tests.
tests/monotouch-test/dotnet/macOS/monotouch-test.csproj	Adds host configuration option for TypeMappingEntryAssembly.
tests/monotouch-test/dotnet/macOS/Makefile	Adds convenience targets for trimmable-static registrar runs.
tests/monotouch-test/dotnet/macOS/.vscode/tasks.json	Adds VS Code build task for monotouch-test macOS.
tests/monotouch-test/dotnet/macOS/.vscode/launch.json	Adds VS Code launch profiles for running monotouch-test macOS.
tests/dotnet/MySimpleApp/shared.csproj	Sets registrar to trimmable-static for MySimpleApp.
tests/common/test-variations.csproj	Defines new test variations for trimmable-static registrar.
tests/common/shared-dotnet.mk	Minor build log output improvement.
src/ObjCRuntime/TypeMaps.cs	New runtime helper to lazily initialize typemap dictionaries.
src/ObjCRuntime/Runtime.cs	Add trimmable-static runtime flag + proxy-based construction + new unmanaged lookup signature.
src/ObjCRuntime/RegistrarHelper.cs	Extend unmanaged lookup to optionally resolve via typemap/proxy attribute.
src/ObjCRuntime/Registrar.cs	Add `IsStubClass` convenience property on ObjCType.
src/ObjCRuntime/Class.cs	Add trimmable typemap lookup path and introduce proxy attribute base types/universe markers.
src/ILLink.Substitutions.tvOS.xml	Add substitutions for `IsTrimmableStaticRegistrar`.
src/ILLink.Substitutions.macOS.xml	Add substitutions for `IsTrimmableStaticRegistrar`.
src/ILLink.Substitutions.MacCatalyst.xml	Add substitutions for `IsTrimmableStaticRegistrar`.
src/ILLink.Substitutions.iOS.xml	Add substitutions for `IsTrimmableStaticRegistrar`.
src/frameworks.sources	Include new ObjCRuntime/TypeMaps.cs in build.
scripts/rsp-to-csproj/rsp-to-csproj.cs	Add `Link="..."` metadata for generated csproj items when applicable.
runtime/xamarin/runtime.h	Add trimmable-static registrar flag setter + extend registrar dlsym signature.
runtime/runtime.m	Implement trimmable-static registrar flag + pass objc class name to unmanaged lookup.
runtime/delegates.t4	Extend managed delegate signature for unmanaged lookup to include objc class name.
dotnet/targets/Xamarin.Shared.Sdk.targets	Wire registrar mode to linker steps, typemap output publishing, and host config options.

Copilot · 2026-04-03T10:12:48Z

tools/dotnet-linker/.vscode/launch.json

+            "program": "/Users/rolf/work/dotnet/macios/trimmable-type-map/macios/builds/downloads/dotnet-sdk-10.0.300-preview.0.26177.108/dotnet",
+            "args": [
+                "/Users/rolf/work/dotnet/macios/trimmable-type-map/macios/packages/microsoft.net.illink.tasks/10.0.5/tools/net/illink.dll",
+                "-x",
+                "/Users/rolf/work/dotnet/macios/trimmable-type-map/macios/tests/nunit.framework.xml",
+                "-x",
+                "bin/Debug/net10.0-macos/osx-arm64/LinkerInputs.cache.xml",
+                "-a",


This new file contains a machine-specific VS Code launch configuration (absolute paths under /Users/..., large hard-coded args). This makes the repo non-portable and will quickly go stale for other developers/CI. Please remove it from the repo or rewrite it to use ${workspaceFolder} and relative paths with minimal, generic arguments (similar to tests/xharness/.vscode/launch.json).

Copilot · 2026-04-03T10:12:49Z

tests/monotouch-test/dotnet/macOS/Makefile

+simple: export RID=
+simple: export RUNTIMEIDENTIFIER=
+simple: export RUNTIMEIDENTIFIERS=
+simple: export TEST_VARIATION=trimmable-static-registrar
+simple: export TestVariation=trimmable-static-registrar
+simple:
+	mair
+	git clean -xfd
+	make build
+	bin/Debug/*/*/monotouchtest.app/Contents/MacOS/monotouchtest --test apitest.KernelNotificationTest
+
+s: export RID=
+s: export RUNTIMEIDENTIFIER=
+s: export RUNTIMEIDENTIFIERS=
+s: export TEST_VARIATION=trimmable-static-registrar
+s: export TestVariation=trimmable-static-registrar
+s:
+	madl
+	git clean -xfd
+	make build
+	bin/Debug/*/*/monotouchtest.app/Contents/MacOS/monotouchtest --test MonoTouchFixtures.ObjCRuntime.GCHandleSwitchRaceTest


The new Makefile targets (simple/s/a) invoke non-standard commands ("mair", "madl") and run git clean -xfd, which is destructive and will delete local work/artifacts. These look like local developer aliases and shouldn't be committed as part of the test harness. Please remove these targets or replace them with safe, repo-standard commands.

Copilot · 2026-04-03T10:12:49Z

tests/monotouch-test/Foundation/StringTest.cs

+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			NSString.Empty.DangerousRelease ();
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			NSString.Empty.DangerousRelease ();
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			NSString.Empty.DangerousRelease ();
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			NSString.Empty.DangerousRelease ();
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			NSString.Empty.DangerousRelease ();
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

 			Assert.That (NSString.Empty.RetainCount, Is.EqualTo (nuint.MaxValue), "RetainCount");
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");
 			Assert.That (NSString.Empty.Compare (new NSString (string.Empty)), Is.EqualTo (NSComparisonResult.Same), "Same");
+			Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");


The added Console.WriteLine calls will produce a lot of noise in CI test logs and can make failures harder to spot. Please remove these debug prints or guard them behind a conditional (e.g., #if DEBUG/TRACE) or an environment switch so normal test runs stay quiet.

Suggested change

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

Assert.That (NSString.Empty.RetainCount, Is.EqualTo (nuint.MaxValue), "RetainCount");

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

Assert.That (NSString.Empty.Compare (new NSString (string.Empty)), Is.EqualTo (NSComparisonResult.Same), "Same");

Console.WriteLine ($"ReleaseEmptyString () NSString.Empty: {NSString.Empty.Handle} ({NSString.Empty.RetainCount})");

NSString.Empty.DangerousRelease ();

NSString.Empty.DangerousRelease ();

NSString.Empty.DangerousRelease ();

NSString.Empty.DangerousRelease ();

NSString.Empty.DangerousRelease ();

Assert.That (NSString.Empty.RetainCount, Is.EqualTo (nuint.MaxValue), "RetainCount");

Assert.That (NSString.Empty.Compare (new NSString (string.Empty)), Is.EqualTo (NSComparisonResult.Same), "Same");

Copilot · 2026-04-03T10:12:49Z

tools/common/Application.cs

 					return !AreAnyAssembliesTrimmed;
 				case ApplePlatform.MacOSX:
-					return (Registrar == RegistrarMode.Static || Registrar == RegistrarMode.ManagedStatic) && !AreAnyAssembliesTrimmed;
+					return (Registrar == RegistrarMode.Static || Registrar == RegistrarMode.ManagedStatic || Registrar == RegistrarMode.TrimmableStatic) && !AreAnyAssembliesTrimmed;


There is a non-ASCII/zero-width whitespace character in this condition (|| Registrar), which makes diffs and editing error-prone. Please replace it with a normal ASCII space (or remove extra whitespace) so the line is plain text.

Suggested change

return (Registrar == RegistrarMode.Static || Registrar == RegistrarMode.ManagedStatic || Registrar == RegistrarMode.TrimmableStatic) && !AreAnyAssembliesTrimmed;

return (Registrar == RegistrarMode.Static || Registrar == RegistrarMode.ManagedStatic || Registrar == RegistrarMode.TrimmableStatic) && !AreAnyAssembliesTrimmed;

Copilot · 2026-04-03T10:12:50Z

tools/common/StaticRegistrar.cs

 				var flags = MTTypeFlags.None;

+				if (IsCustomType (@class))
+					flags |= MTTypeFlags.CustomType;


This line contains a non-ASCII whitespace character between flags and |= (visible as flags |=). Hidden characters like this are easy to miss and can cause churn in future diffs. Please replace it with normal ASCII whitespace.

Suggested change

flags |= MTTypeFlags.CustomType;

flags |= MTTypeFlags.CustomType;

Copilot · 2026-04-03T10:12:52Z

tests/monotouch-test/dotnet/macOS/monotouch-test.csproj

    </Compile>
  </ItemGroup>
+
+  <ItemGroup>


This RuntimeHostConfigurationOption is added unconditionally for the monotouch-test macOS project. If this setting is only required for the trimmable-static registrar, it should be conditioned on the corresponding TestVariation/Registrar to avoid changing runtimeconfig for all variants (including dynamic/static/managed-static registrar runs).

Suggested change

<ItemGroup>

<ItemGroup Condition="'$(Registrar)' == 'trimmable-static'">

Copilot · 2026-04-03T10:12:52Z

dotnet/targets/Xamarin.Shared.Sdk.targets

@@ -725,6 +731,7 @@
 			<RuntimeHostConfigurationOption Include="ObjCRUntime.AggressiveAttributeTrimmingOnlyWithStaticRegistrar" value="true" Trim="true" Condition="'$(MobileAggressiveAttributeTrimming)' == 'true' And ('$(Registrar)' == 'static' Or '$(Registrar)' == 'managed-static')" />


ObjCRuntime.AggressiveAttributeTrimmingOnlyWithStaticRegistrar is conditioned on Registrar being static or managed-static, but the new trimmable-static registrar is also a static registrar mode. If this feature gate is intended to apply to all static registrar modes, please include trimmable-static in the condition as well so behavior stays consistent.

Suggested change

<RuntimeHostConfigurationOption Include="ObjCRUntime.AggressiveAttributeTrimmingOnlyWithStaticRegistrar" value="true" Trim="true" Condition="'$(MobileAggressiveAttributeTrimming)' == 'true' And ('$(Registrar)' == 'static' Or '$(Registrar)' == 'managed-static')" />

<RuntimeHostConfigurationOption Include="ObjCRUntime.AggressiveAttributeTrimmingOnlyWithStaticRegistrar" value="true" Trim="true" Condition="'$(MobileAggressiveAttributeTrimming)' == 'true' And ('$(Registrar)' == 'static' Or '$(Registrar)' == 'managed-static' Or '$(Registrar)' == 'trimmable-static')" />

Copilot · 2026-04-03T10:12:52Z

tools/dotnet-linker/Steps/TrimmableRegistrarStep.cs

+			var resolver = abr.PlatformAssembly.MainModule.AssemblyResolver;
+			var getAssembly = resolver.GetType ().GetMethod ("GetAssembly", new Type [] { typeof (string) })!;
+			foreach (var asm in createdAssemblies) {
+				var fn = Path.Combine (App.TypeMapOutputDirectory, asm.Name.Name + ".dll");
+				if (!File.Exists (fn))
+					continue;
+				var asmDef = getAssembly.Invoke (resolver, new object [] { fn }) as AssemblyDefinition;
+				Console.WriteLine ($"Loaded assembly: {asmDef?.FullName ?? "null!"} at {fn}");
+			}


The reflection-based AssemblyResolver.GetAssembly invocation and the subsequent "Loaded assembly" Console.WriteLine look like leftover diagnostics. Besides the nullability concern, this adds overhead and log noise during linking without affecting output. Please remove this block or guard it behind a high verbosity/diagnostic switch.

Copilot · 2026-04-03T10:12:52Z

tests/dotnet/MySimpleApp/shared.csproj

+
+		<Registrar>trimmable-static</Registrar>


This sets <Registrar>trimmable-static</Registrar> unconditionally for MySimpleApp. MySimpleApp is referenced by many dotnet build/unit tests, so this changes a broad set of test executions and may mask regressions in other registrar modes. Consider enabling trimmable-static via a dedicated TestVariation instead of hard-coding it in the shared project.

Suggested change

<Registrar>trimmable-static</Registrar>

Copilot · 2026-04-03T10:12:52Z

tools/dotnet-linker/Steps/TrimmableRegistrarStep.cs

+namespace Xamarin.Linker {
+	public class TrimmableRegistrarStep : ConfigurationAwareStep {
+		protected override string Name { get; } = "TrimmableRegistrar";
+		protected override int ErrorCode { get; } = 2430;


The PR description still contains placeholder TODO text ("TODO: Update this description with more TODOs."). Please replace it with a real summary of the design/behavior changes (and any limitations/known issues) before merging so reviewers and future maintainers have the necessary context.

vs-mobiletools-engineering-service2 · 2026-04-03T10:42:10Z

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vs-mobiletools-engineering-service2 · 2026-04-03T10:46:17Z

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vs-mobiletools-engineering-service2 · 2026-04-03T10:58:21Z

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vs-mobiletools-engineering-service2 · 2026-04-03T11:09:36Z

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Hash: 33e190633d8ac09823de0040805072ac3ff07cd6 [PR build]

vs-mobiletools-engineering-service2 · 2026-04-03T13:12:12Z

🔥 [CI Build #33e1906] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

3 tests crashed, 11 tests failed, 152 tests passed.

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❌ cecil tests

🔥 Failed catastrophically on VSTS: test results - cecil (no summary found).

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✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 15 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
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rolfbjarne and others added 9 commits April 1, 2026 10:54

[scripts] Make 'rsp-to-csproj' add included files into folders.

4102814

[trimmable registrar] type maps

583a22e

sshhh

b7c6bfa

Add: Fixes #23108

1d0fdd3

wip

0043f4d

Add license header to TypeMaps.cs

900722e

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

testvariations

76f40cc

wip

add6737

doesthisdoit

783edf7

rolfbjarne requested a review from Copilot April 3, 2026 10:03

Copilot started reviewing on behalf of rolfbjarne April 3, 2026 10:03 View session

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	return (Registrar == RegistrarMode.Static \|\| Registrar == RegistrarMode.ManagedStatic \|\| Registrar == RegistrarMode.TrimmableStatic) && !AreAnyAssembliesTrimmed;
	return (Registrar == RegistrarMode.Static \|\| Registrar == RegistrarMode.ManagedStatic \|\| Registrar == RegistrarMode.TrimmableStatic) && !AreAnyAssembliesTrimmed;

	flags \|= MTTypeFlags.CustomType;
	flags \|= MTTypeFlags.CustomType;

	<ItemGroup>
	<ItemGroup Condition="'$(Registrar)' == 'trimmable-static'">

		@@ -725,6 +731,7 @@
		<RuntimeHostConfigurationOption Include="ObjCRUntime.AggressiveAttributeTrimmingOnlyWithStaticRegistrar" value="true" Trim="true" Condition="'$(MobileAggressiveAttributeTrimming)' == 'true' And ('$(Registrar)' == 'static' Or '$(Registrar)' == 'managed-static')" />

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✅ [CI Build #33e1906] Build passed (Build packages) ✅

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🔥 [CI Build #33e1906] Test results 🔥

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