[6.2] [SymbolGraphGen] distinguish between headers of the same name in different modules #82120
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QuietMisdreavus
commented
Jun 9, 2025
QuietMisdreavus
commented
- Explanation: Makes SymbolGraphGen use fully-qualified module names when comparing modules for determining symbol sources.
- Scope: Fixes an uncommon bug when extending an Objective-C type using a header with the same name as the source module's header.
- Issues: rdar://152676102
- Original PRs: [SymbolGraphGen] distinguish between headers of the same name in different modules #82112
- Risk: Low. The change does not affect normal compilation, and the change will only affect which symbol graph a symbol is sorted into, and shouldn't introduce any crashes.
- Testing: Automated tests verify the change.
- Reviewers: @franklinsch
…erent modules (#82112) Resolves rdar://152676102 In Objective-C, it's reasonable to sort extensions of your dependency's types into headers that match the name of that type. However, this runs into a bug in SymbolGraphGen when it comes time to generate Swift symbol graphs for that Objective-C code: At the moment, it only differentiates between modules based on their base name, regardless of their parent modules (if any). This causes these extensions to be incorrectly sorted into the _extending module's_ symbol graph, rather than in an extension symbol graph where it can be displayed with the _extended module_. When processed with Swift-DocC, it would cause these symbols to disappear. This PR updates the `areModulesEqual` function used by the `SymbolGraphASTWalker` to consider the fully-qualified module name for comparisons, rather than just the module's base name, causing situations like the test's `Dependency.DependencyClass` and `HeaderCollision.DependencyClass` to be properly distinguished from each other.
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@swift-ci Please test |
nkcsgexi
approved these changes
Jun 10, 2025
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