[Async v2] Implement async method variant handling in AddMethod and UpdateMethod by tommcdon · Pull Request #125397 · dotnet/runtime

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

You can also share your feedback on Copilot code review. Take the survey.

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

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Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

tommcdon · 2026-03-10T18:33:59Z

This change implements a TODO item in EEClass::AddMethodDesc to support Runtime Async

dotnet-policy-service · 2026-03-10T18:35:00Z

Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

Copilot

Pull request overview

This PR implements runtime-async method variant support in the Edit-and-Continue (EnC) path by extending EEClass::AddMethodDesc/EEClass::AddMethod to carry async metadata (flags + optional alternate signature) and by updating EnC method update logic to consider async method variants.

Changes:

Extend EEClass::AddMethodDesc to accept async flags and an optional async-variant signature, and plumb that into MethodTableBuilder::InitMethodDesc.
Add async return-type classification and async-variant creation logic to EEClass::AddMethod.
Update EditAndContinueModule::UpdateMethod to also reset the entrypoint for the method’s async counterpart.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/vm/encee.cpp	Resets entrypoints for async counterparts during EnC method updates.
src/coreclr/vm/class.h	Extends `AddMethodDesc` signature to accept async flags and optional async signature.
src/coreclr/vm/class.cpp	Implements async return classification and passes async flags/signature into EnC-added `MethodDesc` creation.

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Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

…ejection, generic UpdateMethod comment - class.cpp:579: Update GC violation comment to acknowledge the extern-alias edge case as Won't Fix per reviewer feedback - class.cpp:597: Reject infrastructure async methods (IsMiAsync but not task-returning) on non-system modules with COR_E_BADIMAGEFORMAT, mirroring MethodTableBuilder validation - encee.cpp:388: Add comment explaining that ResetCodeEntryPointForEnC cascades from thunk to async variant automatically, so generic UpdateMethod path does not need explicit async variant handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

noahfalk

Looks good 👍 Couple suggestions inline

Copilot

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Instead of lazily creating async variant MethodDescs in FindOrCreateAssociatedMethodDesc, create them eagerly alongside the primary thunk in EEClass::AddMethod. The variant signature is computed once from metadata and then AddMethodDesc (GC_NOTRIGGER) creates both MethodDescs. For generic types, each existing instantiation gets its own sig copy from its loader allocator. This eliminates: - Lazy creation block in FCAMD (double-check locking, GCX_COOP, lock) - LoadTypicalMethodDefinition fallback for async variants - EEClass::AddAsyncVariant helper (no longer needed) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Previously AddMethod only created async variants for IsMiAsync methods. Normal type loading (MethodTableBuilder::EnumerateClassMethods) creates variants for all task-returning methods regardless of IsMiAsync. This change aligns EnC with that behavior: - IsMiAsync: primary is thunk, async variant owns the IL - Non-IsMiAsync: primary owns IL, async variant is a thunk Also removes per-instantiation signature copy for generic types since instantiations cannot have longer lifetime than the definition. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace inline NonGenericTask and GenericTask signature rewriting in MethodTableBuilder::EnumerateClassMethods with calls to the shared BuildAsyncVariantSignature function. The ReturnDroppingThunk case (rare covariant override scenario) remains inline since it has unique logic not applicable to the EnC path. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

For task-returning methods with async variants, detect when the primary MethodDesc is a thunk and switch to the async variant that owns the user code before planting remap breakpoints. This eliminates the duplicated breakpoint-planting loop that previously handled the async variant separately. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Per reviewer feedback, inline the sig construction directly in EEClass::AddMethod instead of using a shared BuildAsyncVariantSignature function. Remove the function from method.cpp/method.hpp. Revert all changes to genmeth.cpp and methodtablebuilder.cpp as no modifications are needed in the normal type loading path for the EnC feature. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Per reviewer feedback, return S_OK instead of falling through when GetAsyncVariantNoCreate() returns NULL for an async thunk. There is no user code to plant remap breakpoints on in this case. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Re-add comment explaining the Won't Fix corner cases around the CONTRACT_VIOLATION(GCViolation) in EnC async variant creation: type identity may not match well-known types, and the call may trigger GC even for well-known types. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tommcdon · 2026-04-23T22:26:14Z

/ba-g failures are pre-existing/unrelated

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