fix: don't request semantic models for attribute syntax from other compilations (DevKit crash) - #6855
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…ompilations In IDE workspaces project references are CompilationReferences, so attributes declared in a referenced project keep an ApplicationSyntaxReference into that project's syntax trees. AttributeWriter treated any non-null syntax reference as local and called Compilation.GetSemanticModel on a foreign tree, which throws "SyntaxTree is not part of the compilation" and crashes the generator (and the C# DevKit language server request that ran it). Add AttributeData.GetApplicationSyntaxInCompilation, which only returns the attribute syntax when Compilation.ContainsSyntaxTree is true, and use it in AttributeWriter and the [Arguments] decimal-precision path so foreign attributes take the existing TypedConstant fallback exactly as metadata references do on the command line. Fixes #6854
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe change prevents semantic lookups against syntax trees outside the active compilation. Attribute generation uses typed constants for foreign syntax and preserves only valid decimal literal text. Cross-compilation tests validate generated output and diagnostics. ChangesAttribute generation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant DerivedCompilation
participant TestMetadataGenerator
participant AttributeWriter
participant GeneratedSource
DerivedCompilation->>TestMetadataGenerator: Process inherited attributes
TestMetadataGenerator->>AttributeWriter: Generate attribute initialization
AttributeWriter->>AttributeWriter: Check syntax tree ownership
AttributeWriter-->>TestMetadataGenerator: Use syntax or typed constants
TestMetadataGenerator-->>GeneratedSource: Emit validated attribute code
Merge Risk: ⚪ Minimal · up to Source generation now avoids foreign-compilation semantic lookups while preserving valid attribute output for decimal, integral, radix, named, and nullable arguments. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| var attributeSyntax = attr.ApplicationSyntaxReference?.GetSyntax() as AttributeSyntax; | ||
| // Get the attribute syntax to access source text (preserves precision for decimals). | ||
| // Null for metadata references and for CompilationReferences to other projects (IDE). | ||
| var attributeSyntax = attr.GetApplicationSyntaxInCompilation(compilation); |
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When a referenced-project [Arguments] supplies a decimal parameter from a high-precision literal such as 123_999.00000000000000001, this returns null even though the syntax remains available, sending the value through TypedConstantFormatter after Roslyn has already rounded it to a double. The generated test therefore receives a different decimal value than same-project source generation, whose decimal path deliberately uses the original source text; retain the foreign syntax for literal extraction while avoiding only the semantic-model lookup.
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Verified and addressed in 8672889. The [Arguments] path no longer discards foreign syntax: it reads ApplicationSyntaxReference unconditionally and only gates the GetSemanticModel call on Compilation.ContainsSyntaxTree. When the semantic model is unavailable, GenerateArgumentsAttributeFromTypedConstants still uses the source text for numeric literals bound to decimal parameters (including the unary-minus form), provided the positional syntax arguments align 1:1 with the typed-constant values; otherwise (e.g. [Arguments(new object[] { ... })]) it uses the typed constants. Covered by the 123_999.00000000000000001m / -1.5m / 2.5m assertions in CrossCompilationAttributeTests.
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| var attributeSyntax = attr.ApplicationSyntaxReference?.GetSyntax() as AttributeSyntax; | ||
| // Get the attribute syntax to access source text (preserves precision for decimals). | ||
| // Null for metadata references and for CompilationReferences to other projects (IDE). | ||
| var attributeSyntax = attr.GetApplicationSyntaxInCompilation(compilation); |
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When a referenced-project [Arguments] supplies a decimal parameter from a high-precision literal such as 123_999.00000000000000001, this returns null even though the syntax remains available, sending the value through TypedConstantFormatter after Roslyn has already rounded it to a double. The generated test therefore receives a different decimal value than same-project source generation, whose decimal path deliberately uses the original source text; retain the foreign syntax for literal extraction while avoiding only the semantic-model lookup.
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Duplicate of the thread above; addressed in 8672889.
…ed-constant fallback Review follow-up. The TypedConstant fallback in GenerateArgumentsAttributeWithParameterTypes emitted only the constructor arguments, so Skip, DisplayName, Categories and SkipIfEmpty on an inherited [Arguments] from another project were dropped. It also discarded the foreign syntax entirely, so a numeric literal bound to a decimal parameter went through the double TypedConstant and lost precision that same-project generation keeps. Split the fallback into GenerateArgumentsAttributeFromTypedConstants: it now appends attr.NamedArguments as an object initializer, uses the foreign syntax text for numeric literals on decimal parameters when the syntax arguments align 1:1 with the values, and guards the null params-array form of [Arguments(null)]. Only the semantic-model lookup is gated on Compilation.ContainsSyntaxTree.
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| if (expression is PrefixUnaryExpressionSyntax unary && unary.IsKind(SyntaxKind.UnaryMinusExpression)) | ||
| { | ||
| expression = unary.Operand; |
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For a referenced-project case such as [Arguments(+123_999.00000000000000001)] targeting a decimal parameter, this helper recognizes unary minus but not unary plus, so the foreign-syntax path formats Roslyn's already-rounded double typed constant instead of preserving the literal text. The same-project path preserves this expression, producing different test data depending on the reference mode; the new unary-minus-only check is fresh evidence beyond the previously reported general precision issue.
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Verified and fixed in a300f0d: TryGetDecimalLiteralText handles UnaryPlusExpression as well as UnaryMinusExpression (the + is dropped, so [Arguments(+0.5)] emits 0.5m). Covered by a new +0.5 case in CrossCompilationAttributeTests.
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Inline comments:
In `@src/TUnit.Core.SourceGenerator/Generators/TestMetadataGenerator.cs`:
- Around line 1578-1579: Update the numeric-literal handling in
TestMetadataGenerator so the source text is preserved only for
decimal-compatible literals; for integral-suffixed or radix-prefixed literals
such as 1L and 0x1, use TypedConstantFormatter.FormatForCode(values[i],
targetType) instead of appending m. Ensure generated C# remains valid while
retaining the existing formatting for compatible decimal literals.
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Code ReviewI reviewed this PR (fix for a source-generator crash when attributes come from a The core fix — gating Two smaller issues survived review, both non-blocking:
Both findings are plausible but not confirmed defects — the first requires a mid-format exception to trigger, and the second is a maintainability/duplication concern rather than an active bug. No other prior review comments (CodeRabbit, Codex, Greptile) raised issues that remain unaddressed at the current head commit. |
…nts] fallback
Review follow-up. Appending "m" to any numeric literal produced invalid C# for
integral suffixes and radix prefixes (100L -> 100Lm, 0x1F -> 0x1m, 0b1010 ->
0b1010m). TryGetDecimalLiteralText now accepts only plain digit sequences with
optional separators, fraction, exponent and a real suffix, honours unary plus as
well as unary minus, and everything else is formatted from the typed constant.
The typed-constant fallback is built into a local CodeWriter and appended with
AppendRaw, so a formatting failure part-way through no longer leaves a partial
"new X(" on the shared writer for the caller's catch block to append after.
GenerateArgumentsAttributeWithParameterTypes now uses the shared
AttributeData.GetApplicationSyntax(compilation, out isInCompilation) helper so
the syntax-ownership rule lives in one place alongside
GetApplicationSyntaxInCompilation.
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ReviewConfirmed the fix: The two findings from the earlier automated review on this PR (buffered writer for the typed-constant fallback so a mid-format exception can't corrupt the shared One pre-existing duplication worth a follow-up, not a blocker for this PR:
Since this PR already introduces the safer, well-tested literal-detection logic, it'd be worth extracting Nice test coverage in |
…tributeInstantiation (#6856) * refactor: remove unreachable decimal source-text path from GenerateAttributeInstantiation No caller passes targetParameters, so parameterTypes was always null and every decimal source-text branch was dead. Dropping it leaves TestMetadataGenerator.TryGetDecimalLiteralText as the only implementation of the source-text-vs-typed-constant decision, and stops parsing attribute syntax for attributes that never use it. Follow-up to review feedback on #6855. * fix: emit null for a null params array in GenerateAttributeInstantiation A null params array (e.g. [Arguments(null)]) was expanded into zero arguments, turning the attribute into an empty-array call. Let it fall through so it is emitted as a single null argument. * refactor: remove unreachable params-array expansion from GenerateAttributeInstantiation The IsParamsArrayArgument branch only matched ArgumentsAttribute/InlineDataAttribute, neither of which can reach this function: GenerateTestAttributes filters out IDataSourceAttribute implementations (ArgumentsAttribute is one), the TestMetadataGenerator callers only handle MethodDataSource fallbacks, and StaticPropertyInitializationGenerator routes ArgumentsAttribute elsewhere first. InlineDataAttribute does not exist in TUnit. Remove the branch and the helper.
Updated [TUnit](https://github.com/thomhurst/TUnit) from 1.68.4 to 1.69.0. <details> <summary>Release notes</summary> _Sourced from [TUnit's releases](https://github.com/thomhurst/TUnit/releases)._ ## 1.69.0 <!-- Release notes generated using configuration in .github/release.yml at v1.69.0 --> ## What's Changed ### Other Changes * feat(templates): add enableDotCover flag (#6714) by @ForNeVeR in thomhurst/TUnit#6844 * fix: don't request semantic models for attribute syntax from other compilations (DevKit crash) by @thomhurst in thomhurst/TUnit#6855 * fix(ci): restore net472 PublicAPI tests on Windows by @thomhurst in thomhurst/TUnit#6857 * perf(html-report): stream report JSON through pooled chunks and overlap sidecar serialization by @thomhurst in thomhurst/TUnit#6860 * chore(renovate): cap Microsoft.Build packages below 18.10.0 by @thomhurst in thomhurst/TUnit#6863 * perf: shrink generated per-class test source static constructors (~40% less startup JIT) by @thomhurst in thomhurst/TUnit#6859 * refactor: remove unreachable decimal source-text path from GenerateAttributeInstantiation by @thomhurst in thomhurst/TUnit#6856 * perf: cut per-test allocations in discovery and execution (-61% at 10k tests) by @thomhurst in thomhurst/TUnit#6861 * perf: stop hashing per-test event receivers during registration (data-driven tests 2.9x faster at 10k) by @thomhurst in thomhurst/TUnit#6858 * perf(analyzers): cut TUnit analyzer build time ~60% on large test projects by @thomhurst in thomhurst/TUnit#6862 ### Dependencies * chore(deps): update opentelemetry to 1.19.0 by @thomhurst in thomhurst/TUnit#6838 * chore(deps): update dependency opentelemetry.instrumentation.runtime to 1.19.0 by @thomhurst in thomhurst/TUnit#6840 * chore(deps): update tunit to 1.68.17 by @thomhurst in thomhurst/TUnit#6839 * chore(deps): update verify to 33.1.0 by @thomhurst in thomhurst/TUnit#6843 * chore(deps): update verify to 33.1.1 by @thomhurst in thomhurst/TUnit#6847 * chore(deps): update opentelemetry to 1.19.1 by @thomhurst in thomhurst/TUnit#6850 * chore(deps): update dependency grpc.core.api to 2.84.0 by @thomhurst in thomhurst/TUnit#6851 * chore(deps): update dependency stackexchange.redis to 3.3.1 by @thomhurst in thomhurst/TUnit#6853 * chore(deps): update dependency polyfill to 11.4.0 by @thomhurst in thomhurst/TUnit#6841 * chore(deps): update dependency polyfill to 11.4.0 by @thomhurst in thomhurst/TUnit#6842 ## New Contributors * @ForNeVeR made their first contribution in thomhurst/TUnit#6844 **Full Changelog**: thomhurst/TUnit@v1.68.17...v1.69.0 ## 1.68.17 <!-- Release notes generated using configuration in .github/release.yml at v1.68.17 --> ## What's Changed ### Other Changes * fix(mocks): emit init accessors for init-only properties and indexers by @thomhurst in thomhurst/TUnit#6833 * fix(mocks): let one type be mocked regularly and wrapped in one compilation by @thomhurst in thomhurst/TUnit#6835 * fix(mocks): keep editors in sync with publicized project references (#6836) by @thomhurst in thomhurst/TUnit#6837 ### Dependencies * chore(deps): update tunit to 1.68.4 by @thomhurst in thomhurst/TUnit#6824 * chore(deps): update mstest to 4.4.1 by @thomhurst in thomhurst/TUnit#6825 * chore(deps): update microsoft.testing by @thomhurst in thomhurst/TUnit#6717 * chore(deps): update verify to v33 by @thomhurst in thomhurst/TUnit#6794 * chore(deps): update dependency stackexchange.redis to 3.2.15 by @thomhurst in thomhurst/TUnit#6827 * chore(deps): update dependency messagepack to 3.1.9 by @thomhurst in thomhurst/TUnit#6828 * chore(deps): update dependency stackexchange.redis to 3.3.0 by @thomhurst in thomhurst/TUnit#6831 * chore(deps): update opentelemetry to 1.19.0 by @thomhurst in thomhurst/TUnit#6832 **Full Changelog**: thomhurst/TUnit@v1.68.4...v1.68.17 Commits viewable in [compare view](thomhurst/TUnit@v1.68.4...v1.69.0). </details> Updated [TUnit.AspNetCore](https://github.com/thomhurst/TUnit) from 1.68.4 to 1.69.0. <details> <summary>Release notes</summary> _Sourced from [TUnit.AspNetCore's releases](https://github.com/thomhurst/TUnit/releases)._ ## 1.69.0 <!-- Release notes generated using configuration in .github/release.yml at v1.69.0 --> ## What's Changed ### Other Changes * feat(templates): add enableDotCover flag (#6714) by @ForNeVeR in thomhurst/TUnit#6844 * fix: don't request semantic models for attribute syntax from other compilations (DevKit crash) by @thomhurst in thomhurst/TUnit#6855 * fix(ci): restore net472 PublicAPI tests on Windows by @thomhurst in thomhurst/TUnit#6857 * perf(html-report): stream report JSON through pooled chunks and overlap sidecar serialization by @thomhurst in thomhurst/TUnit#6860 * chore(renovate): cap Microsoft.Build packages below 18.10.0 by @thomhurst in thomhurst/TUnit#6863 * perf: shrink generated per-class test source static constructors (~40% less startup JIT) by @thomhurst in thomhurst/TUnit#6859 * refactor: remove unreachable decimal source-text path from GenerateAttributeInstantiation by @thomhurst in thomhurst/TUnit#6856 * perf: cut per-test allocations in discovery and execution (-61% at 10k tests) by @thomhurst in thomhurst/TUnit#6861 * perf: stop hashing per-test event receivers during registration (data-driven tests 2.9x faster at 10k) by @thomhurst in thomhurst/TUnit#6858 * perf(analyzers): cut TUnit analyzer build time ~60% on large test projects by @thomhurst in thomhurst/TUnit#6862 ### Dependencies * chore(deps): update opentelemetry to 1.19.0 by @thomhurst in thomhurst/TUnit#6838 * chore(deps): update dependency opentelemetry.instrumentation.runtime to 1.19.0 by @thomhurst in thomhurst/TUnit#6840 * chore(deps): update tunit to 1.68.17 by @thomhurst in thomhurst/TUnit#6839 * chore(deps): update verify to 33.1.0 by @thomhurst in thomhurst/TUnit#6843 * chore(deps): update verify to 33.1.1 by @thomhurst in thomhurst/TUnit#6847 * chore(deps): update opentelemetry to 1.19.1 by @thomhurst in thomhurst/TUnit#6850 * chore(deps): update dependency grpc.core.api to 2.84.0 by @thomhurst in thomhurst/TUnit#6851 * chore(deps): update dependency stackexchange.redis to 3.3.1 by @thomhurst in thomhurst/TUnit#6853 * chore(deps): update dependency polyfill to 11.4.0 by @thomhurst in thomhurst/TUnit#6841 * chore(deps): update dependency polyfill to 11.4.0 by @thomhurst in thomhurst/TUnit#6842 ## New Contributors * @ForNeVeR made their first contribution in thomhurst/TUnit#6844 **Full Changelog**: thomhurst/TUnit@v1.68.17...v1.69.0 ## 1.68.17 <!-- Release notes generated using configuration in .github/release.yml at v1.68.17 --> ## What's Changed ### Other Changes * fix(mocks): emit init accessors for init-only properties and indexers by @thomhurst in thomhurst/TUnit#6833 * fix(mocks): let one type be mocked regularly and wrapped in one compilation by @thomhurst in thomhurst/TUnit#6835 * fix(mocks): keep editors in sync with publicized project references (#6836) by @thomhurst in thomhurst/TUnit#6837 ### Dependencies * chore(deps): update tunit to 1.68.4 by @thomhurst in thomhurst/TUnit#6824 * chore(deps): update mstest to 4.4.1 by @thomhurst in thomhurst/TUnit#6825 * chore(deps): update microsoft.testing by @thomhurst in thomhurst/TUnit#6717 * chore(deps): update verify to v33 by @thomhurst in thomhurst/TUnit#6794 * chore(deps): update dependency stackexchange.redis to 3.2.15 by @thomhurst in thomhurst/TUnit#6827 * chore(deps): update dependency messagepack to 3.1.9 by @thomhurst in thomhurst/TUnit#6828 * chore(deps): update dependency stackexchange.redis to 3.3.0 by @thomhurst in thomhurst/TUnit#6831 * chore(deps): update opentelemetry to 1.19.0 by @thomhurst in thomhurst/TUnit#6832 **Full Changelog**: thomhurst/TUnit@v1.68.4...v1.68.17 Commits viewable in [compare view](thomhurst/TUnit@v1.68.4...v1.69.0). </details> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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Fixes #6854
Problem
In IDE workspaces (C# DevKit, Visual Studio, Rider) project-to-project references are
CompilationReferences rather than PE references. Attributes declared in a referenced project therefore keep anAttributeData.ApplicationSyntaxReferencethat points into that project's syntax trees.TestMetadataGeneratorcollects attributes from base types (GetAttributesIncludingBaseTypes()) and from inherited test methods ([InheritsTests]). When a test class derives from a base class in another project,AttributeWritersaw a non-null syntax reference, took the syntax-based path, and calledcompilation.GetSemanticModel(attributeArgumentSyntax.SyntaxTree)on a tree the consuming compilation does not own:The exception escapes the generator and takes the whole language-server request down with it, which is what the DevKit log in the issue shows. On the command line the same code works because PE references carry no syntax, so the generator already used the
TypedConstantfallback there.Fix
AttributeData.GetApplicationSyntax(Compilation, out bool isInCompilation)andGetApplicationSyntaxInCompilation(Compilation)extensions share onecompilation.ContainsSyntaxTree(...)ownership rule.ContainsSyntaxTreeis a dictionary lookup, so this is cheap on the hot path.AttributeWriter.WriteAttribute/GetAttributeObjectInitializeruse it, so attributes whose syntax lives in another compilation take the existingWriteAttributeWithoutSyntax(TypedConstant) path, exactly as they do for metadata references on the CLI. The syntax is now resolved once per attribute instead of up to three times.GenerateArgumentsAttributeWithParameterTypes(the[Arguments]decimal-precision path) reads the syntax viaGetApplicationSyntaxand gates only theGetSemanticModelcall onisInCompilation. Itscatchfallback previously re-enteredAttributeWriter.WriteAttributeand would have thrown the same exception a second time.[Arguments]typed-constant fallback is extracted toGenerateArgumentsAttributeFromTypedConstants(review follow-ups 8672889, a300f0d):attr.NamedArgumentsas an object initializer, soSkip,DisplayName,CategoriesandSkipIfEmptyon an inherited[Arguments]are no longer dropped (this was also lost for metadata references before);decimalparameters when the foreign syntax is available and aligns 1:1 with the values, so precision matches same-project generation. Only decimal-compatible forms qualify (TryGetDecimalLiteralText: digits, separators, fraction, exponent, optionald/f/msuffix, unary+/-); hex/binary prefixes andL/Usuffixes are formatted from the typed constant so the output still compiles;[Arguments(null)];CodeWriterand appends viaAppendRaw, so a mid-format exception cannot leave a partialnew X(on the shared writer ahead of the caller'scatchfallback.Generated output for attributes in the current compilation is unchanged; existing snapshots are untouched.
Tests
tests/TUnit.Core.SourceGenerator.Tests/CrossCompilationAttributeTests.csbuilds a base compilation and a derived compilation that references it viaToMetadataReference()(aCompilationReference, the IDE shape) and asserts the precondition that the base attributes carry syntax references into a tree the derived compilation does not contain.AttributeWriter_FallsBackToTypedConstants_ForAttributesFromReferencedCompilationdrivesAttributeWriterdirectly and checks the emittednew global::TUnit.Core.CategoryAttribute("FromBase")/RetryAttribute(3)initializers.TestMetadataGenerator_DoesNotThrow_ForAttributesFromReferencedCompilationruns the full generator over a[InheritsTests]class (covering both the per-class helper path and the inherited-method path, including[Arguments]), asserts no generator exception or error diagnostics, checks the emitted attribute initializers (including123_999.00000000000000001m,-1.5m,0.5mfrom+0.5,2e1m,Skip = "from base",Categories,ArgumentsAttribute(null)), asserts100L/100U/0x1F/0b1010never become…Lm/0x1m/0b1010m, and compiles the output.Both tests fail with
SyntaxTree is not part of the compilationwithout thesrcchanges and pass with them (verified on net10.0 and net472). FullTUnit.Core.SourceGenerator.Testssuite passes on net10.0.Not addressed
The issue also mentions that DevKit previously reported errors in generated files rather than crashing. Those are a separate symptom (likely the
EnableTUnitSourceGeneration/ reflection-mode interplay in design-time builds) and are not changed here.Summary by CodeRabbit
Bug Fixes
Tests