Doug Gregor 8b10bdc189 [Clang importer] Allow noncopyable C structs to define "destroy" operation ...

A C struct can be imported as noncopyable, but C doesn't have
destructors, so there is no way to provide user-defined logic to
perform the destruction. Introduce a new swift_attr that applies to
imported noncopyable types and which provides such a "destroy"
operation. It can be used like this:

    typedef struct __attribute__((swift_attr("~Copyable")))
                   __attribute__((swift_attr("destroy:wgpuAdapterInfoFreeMembers")))
      WGPUAdapterInfo { /*...*/ } WGPUAdapterInfo;

    void wgpuAdapterInfoFreeMembers(WGPUAdapterInfo adapterInfo);

This will bring the WGPUAdapterInfo struct in as a noncopyable type
that will be cleaned up by calling wgpuAdapterInfoFreeMembers once it
is no longer in use.

Implements rdar://156889370.

(cherry picked from commit 6ba560fb4b)

2025-08-12 11:27:54 -07:00

73 KiB

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