Dead-code cleanup: HandleTableMap multi-bucket / multi-AppDomain scaffolding#128646
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…B.1) Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>
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May 27, 2026 13:58
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Tagging subscribers to this area: @JulieLeeMSFT, @dotnet/gc |
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Pull request overview
This PR removes now-unused multi-bucket / multi-AppDomain handle-table scaffolding in CoreCLR’s GC handle table implementation and replaces legacy, effectively-unreachable ABI surface with assert-based stubs to preserve vtable layout.
Changes:
- Removes
Ref_InitializeHandleTableBucket(declaration + definition) since it no longer has in-tree callers. - Replaces
GCHandleStore::Uproot,GCHandleStore::ContainsHandle, andGCHandleManager::CreateHandleStoreimplementations with assert stubs (while keeping the vtable slots) and returns safe defaults (false/nullptr). - Simplifies
CreateHandleStoreby removing theFEATURE_NATIVEAOTsplit in favor of a single stub.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| src/coreclr/gc/objecthandle.h | Removes the unused Ref_InitializeHandleTableBucket declaration. |
| src/coreclr/gc/objecthandle.cpp | Removes the unused Ref_InitializeHandleTableBucket implementation. |
| src/coreclr/gc/gchandletable.cpp | Stubs out legacy virtual methods with asserts to keep ABI/vtable shape while making the path loudly unreachable in checked/debug builds. |
Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>
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@copilot , please address
Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>
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May 27, 2026
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/ba-g All test failures are known issues or caused by Helix issues on amd64 osx |
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Since
dotnet/coreclr#23588(April 2019) removed AppDomain-per-process support,g_HandleTableMaphas had exactly one node andCreateHandleStorehas had zero callers. The supporting scaffolding was never cleaned up.Changes
Tier B.1 — ABI-preserving stubs (
gchandletable.cpp)GCHandleStore::Uproot,GCHandleStore::ContainsHandle,GCHandleManager::CreateHandleStorebodies replaced withassert(!"…dead path…"). Vtable slots preserved forGC_INTERFACE_MAJOR_VERSION 5ABI compatibility with external standalone GC implementations. The#ifndef FEATURE_NATIVEAOTsplit inCreateHandleStoreis unified into a single stub.Tier A — internal removal (
objecthandle.cpp,objecthandle.h)Ref_InitializeHandleTableBucketremoved (definition + header declaration); its only caller wasCreateHandleStore.HandleTableBucketHolderis retained — still used byRef_Initialize.Net ~90 lines removed, no behavior change. The assert stubs convert previously silent dead code into loud regression detection.