Calling C++ Functions #6254
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Calling C++ Functions #6254
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This proposal details the mechanism for calling imported C++ functions from Carbon code. It covers how C++ overload sets are handled, the process of overload resolution leveraging Clang, and the generation of "thunks" – intermediate functions – when necessary to bridge Application Binary Interface (ABI) differences between Carbon and C++.
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FWIW, I've started documenting some of this in #6358. |
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Nov 19, 2025
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There seems to be some overlap between this and https://docs.google.com/document/d/1KUxumZtNe3mY3TsjW2s_ZADOlAaFlrtsLKHVILtqIaM/edit -- but actually not very much. (And Chandler or I should turn that document into a proposal...)
Also, this document reads to me like it's mostly describing a design for implementing C++ function calls in the toolchain in particular (thunks, ABI, type representation, etc. are concerns at that level, I think), so perhaps we could very slightly adjust the framing here to be about that. I think that would also remove the appearance of overlap between the two proposals.
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This proposal details the mechanism for calling imported C++ functions from
Carbon code. It covers how C++ overload sets are handled, the process of
overload resolution leveraging Clang, and the generation of "thunks" –
intermediate functions – when necessary to bridge Application Binary Interface
(ABI) differences between Carbon and C++.