[DO NOT MERGE] Swift CI Testing #1
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shahmishal
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stmontgomery,
grynspan,
dennisweissmann,
briancroom,
SeanROlszewski and
suzannaratcliff
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@swift-ci test |
grynspan
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Oct 7, 2024
Parameterized test functions with the same name but different argument types currently get the same generated names from swift-syntax, so we do some additional decorating to ensure uniqueness. This results in very long symbol names that `swift-demangle` has trouble with. This PR changes the decorating formula. Previously, we would include a copy of the test function's signature (stripped of whitespace, Unicode, and non-identifier-friendly ASCII) and, if the identifier contained non-ASCII characters, the CRC32 of the identifier for further uniqueness. This change drops the copy of the identifier name and always includes the CRC32. Collisions are only possible for fully-qualified test function names that are _identical_, and I naïvely judge the risk of those collisions to be sufficiently low that we can make this change. For `ZipTests.allElementsEqual😀(i:j:)` we currently generate a thunk named: ``` $s12TestingTests03ZipB0V0022allElementsEqual_oxFJo4TestfMp_43funcallElementsEqual__i_Int_j_Int__5bcb7b35fMu_ ``` This change would change it to: ``` $s12TestingTests03ZipB0V0022allElementsEqual_oxFJo4TestfMp_9Z5bcb7b35fMu_ ``` Which demangles to: ``` $s12TestingTests03ZipB0V0022allElementsEqual_oxFJo4TestfMp_9Z5bcb7b35fMu_ ---> unique name #1 of Z5bcb7b35 in peer macro @test expansion #1 of allElementsEqual😀 in TestingTests.ZipTests ``` The benefit of the change is that the generated names are shorter and easier to read when expanding a macro, and play better with the demangler. There may also be some benefit on Windows where the linker has a 65KB symbol name cap, although we're not exporting these symbols so probably not. ### Checklist: - [x] Code and documentation should follow the style of the [Style Guide](https://github.com/apple/swift-testing/blob/main/Documentation/StyleGuide.md). - [x] If public symbols are renamed or modified, DocC references should be updated.
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