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[Clang] Clarify the [[trivial_abi]] documentation. #143243

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Merged
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Jun 9, 2025
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[Clang] Clarify the [[trivial_abi]] documentation. #143243

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[Clang] Clarify the `[[trivial_abi]]` documentation.
cor3ntin Jun 7, 2025
002d009
Apply Erich's feedback after some offline bike-shedding
cor3ntin Jun 9, 2025
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6 changes: 5 additions & 1 deletion clang/include/clang/Basic/AttrDocs.td
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Expand Up @@ -4431,7 +4431,11 @@ destroy the object before returning. The lifetime of the copy of the parameter
in the caller ends without a destructor call when the call begins.

If a type is trivial for the purpose of calls, it is assumed to be trivially
relocatable for the purpose of ``__is_trivially_relocatable``.
relocatable for the purpose of ``__is_trivially_relocatable`` and
``__builtin_is_cpp_trivially_relocatable``.
The copy constructor of a an object of such type might not be called
when the object is passed to a function. Therefore, the ``trivial_abi``
attribute should not be applied to objects that contain pointer to themselves.

Attribute ``trivial_abi`` has no effect in the following cases:

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