perf(source-gen): emit hooks per class with direct, non-async bodies - #6924
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HookMetadataGenerator emitted one file per hook, each with its own namespace, static class, 12 usings and an async body that went through AsyncConvert.Convert(() => ...). Compiling that shape is a noticeable part of CoreCompile in projects with many hooks. - Group hooks by declaring class (Collect + GroupBy into an equatable HookClassGroup) and emit one file per class. Registration fields and body methods now live directly in the TUnit_HookRegistration partial. - For void, Task/Task<T> and ValueTask hooks, emit a direct non-async body that returns the ValueTask. A try/catch turns synchronous throws into a faulted ValueTask, matching the previous async body. Other return types and open generic hooks keep the existing path.
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe hook generator now groups hooks by declaring type, orders generated files by compilation order, and emits shared registration classes with direct invocation bodies. Runtime hook methods use a common invoker. Tests cover generated output, incremental behavior, registration order, and synchronous hook-body semantics. ChangesHook registration and invocation
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change reorganizes how hooks are generated and invoked to produce smaller generated output. Previously reported issues appear addressed, and no concrete remaining merge-blocking risk is evident from the supplied context. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The reviewed paths do not show a new external access path or a weakened execution control. Hook ordering and behavior across all hook combinations remain less certain, so the change merits design review. Retained concerns Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 10.34% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 58 functions across 18 files. (7 skipped: 7 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Review: perf(source-gen): emit hooks per class with direct, non-async bodiesI read the diff and did not build or run the tests. The design is sound and the PR description matches the code. What I checked
Suggestions (non-blocking)
Overall this looks good to merge once you've considered item 1. 🤖 Generated with Claude Code |
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Review comments at
@src/TUnit.Core.SourceGenerator/Generators/HookMetadataGenerator.cs:
- Line 119: Update the hint-name construction in HookMetadataGenerator’s
AddSource call so distinct group.FullyQualifiedTypeName values always produce
unique, deterministic names; preserve a reversible type identifier or append a
stable hash rather than relying on SanitizeForFileName alone.
- Around line 628-632: Update the generated exception handling in
HookMetadataGenerator so synchronous hooks that throw OperationCanceledException
produce a canceled ValueTask rather than a faulted one. Add a dedicated catch
before the general Exception catch, using the exception’s token only if it is
already canceled and otherwise creating a canceled token; preserve the existing
handling for other exceptions.
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src/TUnit.Core.SourceGenerator/Generators/HookMetadataGenerator.cssrc/TUnit.Core.SourceGenerator/Models/Extracted/HookClassGroup.cstests/TUnit.Core.SourceGenerator.Tests/AssemblyAfterTests.Test.verified.txttests/TUnit.Core.SourceGenerator.Tests/AssemblyBeforeTests.Test.verified.txttests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet10_0.verified.txttests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet8_0.verified.txttests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet9_0.verified.txttests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.Net4_7.verified.txttests/TUnit.Core.SourceGenerator.Tests/GlobalStaticAfterEachTests.Test.verified.txttests/TUnit.Core.SourceGenerator.Tests/GlobalStaticBeforeEachTests.Test.verified.txttests/TUnit.Core.SourceGenerator.Tests/HooksTests.DisposableFieldTests.verified.txttests/TUnit.SourceGenerator.IncrementalTests/HookMetadataGeneratorIncrementalTests.cs
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Re-measured on an idle machine (no other builds running). tests/TUnit.TestProject, net10.0 Release, warm compiler server, CoreCompile after touching one file; 2 rounds x 8 warm runs per branch (first 6 runs after each generator swap discarded as warm-up).
No measurable wall-clock CoreCompile change. The benefit here is smaller generated output (566 -> 232 hook files, -21% hook lines), fewer hook lambdas and async state machines, and the ~7% compiler CPU reduction measured earlier. Judge it on those rather than on build wall time. |
…k bodies - Append a stable hash of the exact type/hook identity to per-class hint names and TUnit_HookRegistration member names. Sanitizing is not injective (A_B.C and A.B_C both became A_B_C), which produced duplicate AddSource hint names and duplicate members. - Invoke hook Body delegates through an internal async HookBodyInvoker in TUnit.Core. Direct (non-async) generated bodies again get async-method semantics: a synchronous OperationCanceledException becomes a canceled task, other synchronous exceptions a faulted task, and ExecutionContext changes (AsyncLocal, culture) made by a synchronous hook no longer leak into the hook executor. Generated bodies drop their per-hook try/catch. - Tests: incremental generator test for sanitized-name collisions and a TestProject engine test covering AsyncLocal isolation and cancellation status seen by a custom hook executor.
Review of #6924: one file per hook class, direct hook bodiesThe design is sound. The change is coherent and well-scoped, and I found no blocking issues. The skill runner failed, so this is a manual review of the generator diff and What I like
Points to consider
Overall this is a good change and I'd approve it once the description is refreshed. 🤖 Generated with Claude Code |
# Conflicts: # tests/TUnit.Core.SourceGenerator.Tests/AssemblyAfterTests.Test.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/AssemblyBeforeTests.Test.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet10_0.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet8_0.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.DotNet9_0.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.HooksTest_WithConflictingNamespace.Net4_7.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/GlobalStaticAfterEachTests.Test.verified.txt # tests/TUnit.Core.SourceGenerator.Tests/GlobalStaticBeforeEachTests.Test.verified.txt
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Review: hook generation consolidation (#6924)I read the diff but did not build it or run the tests. The Overall: the approach is sound and the design is clear. It emits direct non-async bodies from the generator and keeps async-method semantics (synchronous throw becomes a faulted task, What I checked
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Registration indices come from static field initializers, which run in generated-file order. Grouping by first appearance in the concatenated per-kind arrays put a class with a Before hook ahead of an earlier class that only had other hook kinds, so equal-Order hooks sharing a registration counter ran in a different order than in reflection mode. Order groups by the source position of each class's first hook, recovering the compilation file order from the collected arrays.
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Summary
HookMetadataGeneratoremitted one file per hook. Each file had its own namespace, a static class, 12 using directives, and anasync ValueTaskbody that called the hook throughAsyncConvert.Convert(() => ...). That meant a lambda, overload resolution across threeConvertoverloads, and an async state machine for every hook. Intests/TUnit.TestProjectthat added up to 566 hook files and 2.4 MB of generated code.What changed
Direct bodies. The generator already knows each hook's return type, so it now emits a non-async body:
void: call the hook, thenreturn default;Task/Task<T>:return new ValueTask(call);ValueTask:return call;async+AsyncConvertcode.The generated bodies have no try/catch, lambda, or state machine. Instead, the hook classes in TUnit.Core call
Bodythrough an internal asyncHookBodyInvoker.InvokeAsyncwrapper. This keeps the semantics of the old async body in both source-gen and reflection modes:instance, becomes a faulted task. AnOperationCanceledExceptionbecomes a canceled task that keeps the original exception.action()caller. Flowing them stays opt-in throughAddAsyncLocalValues().One shared async state machine per hook execution remains at runtime, in
HookBodyInvoker. It does not allocate when the hook completes synchronously, so runtime cost is about the same as before. The gain is in generated code size and compile cost, not hook execution time. Timeout and cancellation handling are unchanged because the executors receive the sameFunc<ValueTask>.SyncHookBodySemanticsTestscovers the exception, cancellation, and AsyncLocal cases.One file per class. Hook models are collected and grouped by declaring type into an equatable
HookClassGroup, using the same Collect/GroupBy/SelectMany pattern asClassTestGroupinTestMetadataGenerator. Each class with hooks gets one<Type>.Hooks.g.csfile. The per-hook namespace and...Initializerclass are gone: registration fields and_Bodymethods are now members of theTUnit_HookRegistrationpartial class. Body methods are named after the existing per-hook safe name plus a stable FNV hash of the exact hook identity, and file hint names append a stable hash of the exact type name.SanitizeForFileNameis not injective (A_B.CandA.B_Cboth map toA_B_C), which only mattered once members share one class. The old<Type>_<Method>_<N>Paramskey could collide between overloads, which only worked before because each hook had its own namespace. Unused usings were dropped.Incrementality: the per-kind
Extract*Hookssteps are unchanged. The Collect fan-in re-runs grouping when any hook model changes, but grouping only rearranges extracted models, and value equality means only the changed class's file is re-emitted. A new incremental test covers this: changing a hook in one of two classes leaves the other groupUnchangedand marks the edited oneModified.Not in scope: in-flight PRs deduplicate
ClassMetadataand replace thereflectionInfoFactorylambdas inMethodInfoExpression. This PR does not touch that expression.Measurements
tests/TUnit.TestProject, net10.0 Release.Generated volume (
EmitCompilerGeneratedFiles):Most of what remains per hook is the
MethodMetadata/ClassMetadatainitializer, which the other in-flight PRs target.Compile cost: the machine was heavily loaded by other concurrent builds, so the
CoreCompilewall times from-clp:PerformanceSummaryranged from 3 s to 19 s and could not be used for comparison. Instead I ran the project's exactcsccommand line (analyzers and generators removed), fed it the full generated output captured from each branch, and ran main and this PR in alternation 8 times each, recording process CPU time:CPU time was lower with this PR in 7 of 8 paired runs, by about 7-8% at median and min. Wall time under this load is inconclusive. The totals include csc startup and JIT, since it ran without the compiler server.
Testing done
tests/TUnit.Core.SourceGenerator.Testson net10.0, net9.0, net8.0 and net472: 9 hook snapshots updated (reviewed), all passing.tests/TUnit.SourceGenerator.IncrementalTests: all 4HookMetadataGeneratorIncrementalTestspass, including the new per-class grouping test (run viadotnet vstest).tests/TUnit.TestProjectwith targeted--treenode-filters over hook classes (AfterTests and BeforeTests namespaces, Bugs/6192, ClassHooks, ClassHooksExecutionCountTests, GenericHooks, HookTimeout/ClassHookTimeout/AssemblyHookTimeoutPass, HookExecutorTests, HookExecutorHookTests*, HookContextRestorationTests, SetHookExecutorTests, SkipInBeforeHookTests, CultureHookTests, HookOrderTests, TestDiscoveryHookTests, SimpleHookTest, STAThreadTests, GlobalTestHooksTests, HookGeneratorTest), in both source-generated and reflection mode. Pass/fail/skip counts are identical to main for every filter. The failures that remain are the intentional ones: AfterTests exception tests, ClassHookTimeoutTests, and GlobalTestHooksTests.tests/TUnit.Engine.Testshook classes: CancellationAfterHooks, Before/AfterEvery Assembly/Class, HookTimeout, HookExecutionOrder, LinkedCancellationTokenFromBeforeHook, TestDiscovery Before/After, SkipInHooks, TestSession Before/After. All pass; the other mode variants skip locally.Summary by CodeRabbit
Summary