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Clean up illink compat suppressions by making internal types non-public #123048

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Clean up illink compat suppressions by making internal types non-public #123048

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Copilot AI commented Jan 9, 2026 •
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Description

Removed ~35 API compatibility suppressions from ILLink by making internal implementation types non-public. Many types were unnecessarily public despite not being exposed in the reference assembly.

Changed visibility to internal for:

  • Extension classes: AssemblyDefinitionExtensions, BannedApiExtensions, CustomAttributeArgumentExtensions, MemberReferenceExtensions, MethodDefinitionExtensions, MethodReferenceExtensions, TypeDefinitionExtensions
  • Helper classes: BCL, ConsoleLogger, TargetRuntimeVersion, FeatureSettings, InternalErrorException, LinkerFatalErrorException
  • Step implementations: AddBypassNGenStep, BodySubstituterStep, CheckSuppressionsDispatcher, CheckSuppressionsStep, CleanStep, CodeRewriterStep, DiscoverOperatorsHandler, DiscoverSerializationHandler, LinkAttributesStep, MarkExportedTypesTarget, OutputStep, OutputWarningSuppressions, ProcessReferencesStep, ProcessWarningsStep, ReflectionBlockedStep, RegenerateGuidStep, RemoveResourcesStep, RemoveSecurity, SealerStep, SweepStep, UnreachableBlocksOptimizer, ValidateVirtualMethodAnnotationsStep

Types remain public when:

  • Defined in ref assembly (LinkContext, AnnotationStore, MessageOrigin, MessageContainer, base step interfaces)
  • Used in public API surface (AttributeInfo, AssemblyResolver, EmbeddedXmlInfo, ProcessLinkerXmlBase, parser types)
  • Used by test code (Driver, RootAssemblyInput, ResolveFromXmlStep, ProcessLinkerXmlStepBase)

Customer Impact

None. Internal API cleanup only.

Regression

No - cleanup of existing suppressions.

Testing

Build verification of illink tools and test projects.

Risk

Low - purely visibility changes to internal implementation types not exposed in ref assembly.

Original prompt

This section details on the original issue you should resolve

<issue_title>Clean up illink compat suppressions by making types non-public</issue_title>
<issue_description>Many of the types defined in ILLink are unnecessarily public, leading to lots of API compat suppressions. We could clean this up by keeping only those types exposed in the ref assembly as public.

edit: #99467 had a start on this.</issue_description>

<agent_instructions>There are api compat suppressions in src\tools\illink\src\linker\CompatibilitySuppressions.xml. Most of these stem from types that are public, but can be internal instead. First, remove some compat suppressions and build in a way that generates compat warnings. You may need to build from the root of the repo with ./build.cmd tools.illink. Then try to make each public type internal and remove the compat suppression from the xml file. Start with just getting the basic issues out of the way. If you try a few different things and can't remove a suppression, leave it be.</agent_instructions>

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@dotnet-policy-service dotnet-policy-service bot added linkable-framework Issues associated with delivering a linker friendly framework labels Jan 9, 2026
Copilot AI changed the title [WIP] Refactor ILLink types to be non-public for better API compatibility Clean up illink compat suppressions by making internal types non-public Jan 9, 2026
Copilot AI requested a review from jtschuster January 9, 2026 22:17
@build-analysis build-analysis bot mentioned this pull request Jan 10, 2026
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jtschuster commented Jan 15, 2026

@copilot Fix the build break:

src/tools/illink/test/Mono.Linker.Tests/TestCasesRunner/TrimmingDriver.cs(10,25): error CS0060: (NETCORE_ENGINEERING_TELEMETRY=Build) Inconsistent accessibility: base class 'Driver' is less accessible than class 'TrimmingDriver.TestDriver'

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Copilot AI commented Jan 15, 2026

@copilot Fix the build break:

src/tools/illink/test/Mono.Linker.Tests/TestCasesRunner/TrimmingDriver.cs(10,25): error CS0060: (NETCORE_ENGINEERING_TELEMETRY=Build) Inconsistent accessibility: base ...

Fixed in commit 5354a36. The Driver class is now public again since it's inherited by TestDriver in the test project. Added back the corresponding compat suppression.

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jtschuster commented Jan 16, 2026

@copilot fix the failures in the build

src/tools/illink/test/ILLink.Tasks.Tests/Mock.cs: error CS0122: (NETCORE_ENGINEERING_TELEMETRY=Build) 'RootAssemblyInput' is inaccessible due to its protection level
src/tools/illink/test/ILLink.Tasks.Tests/Mock.cs: error CS0122: (NETCORE_ENGINEERING_TELEMETRY=Build) 'ResolveFromXmlStep' is inaccessible due to its protection level

@jtschuster
Revert RootAssemblyInput, ResolveFromXmlStep, and ProcessLinkerXmlSte…
aa12fff 
…pBase to public to fix test build

Co-authored-by: jtschuster <[email protected]>
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Copilot AI commented Jan 16, 2026

@copilot fix the failures in the build

src/tools/illink/test/ILLink.Tasks.Tests/Mock.cs: error CS0122: (NETCORE_ENGINEERING_TELEMETRY=Build) 'RootAssemblyInput' is inaccessible due to its protectio...

Fixed in commit aa12fff. The RootAssemblyInput, ResolveFromXmlStep, and ProcessLinkerXmlStepBase classes are now public again since they're used by the ILLink.Tasks.Tests project. Added back the corresponding compat suppressions.

This was referenced Jan 17, 2026
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@marek-safar marek-safar Awaiting requested review from marek-safar marek-safar will be requested when the pull request is marked ready for review marek-safar is a code owner

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Clean up illink compat suppressions by making types non-public

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