[swift-users] Annotating C APIs without changing the original header files

[Michael Gottesman]

+Ankit

Michael

> On May 12, 2017, at 10:10 AM, Geordie J via swift-users <swift-users at swift.org> wrote:
> 
> To continue this thread: I managed to annotate a bunch of C APIs with modulename.apinotes. This works with Xcode (to a certain degree - pointers, enums, and especially OpaquePointers are tricky). I’m now trying to build my package with SwiftPM and it doesn’t seem to recognise the apinotes file. 
> 
> @Doug Gregor, would you be able to advise as to whether apinotes works with SwiftPM (on Linux) and whether it requires some extra settings that I may be unaware of?
> 
> Thanks and best regards for the weekend,
> Geordie
> 
> 
>> Am 08.05.2017 um 00:51 schrieb Geordie Jay <geojay at gmail.com <mailto:geojay at gmail.com>>:
>> 
>> I'm having the same issue. The renames seem to work, as in they disappear from the global scope with a fixit to rename to the new (namespaced) version if I type in the name manually, but they don't appear as static members of the enum type, regardless of how I call them. Would appreciate some help with this too.
>> 
>> Cheers,
>> Geordie 
>> Rick Mann <rmann at latencyzero.com <mailto:rmann at latencyzero.com>> schrieb am So. 7. Mai 2017 um 23:06:
>> I'm trying to use apinotes for this third-party C library (call it "Lib.dylib"). It has an enum lgs_error_t:
>> 
>> typedef enum {
>>     lgs_error_none = 0,
>>     lgs_error_invalid_handle = -1,
>>     lgs_error_null = -2,
>>     lgs_error_invalid_parameter = -3,
>>     lgs_error_invalid_operation = -4,
>>     lgs_error_queue_full = -5
>> } lgs_error_t;
>> 
>> So I wrote apinotes ("Lib.apinotes") that look like this, next to the .dylib, and part of my Xcode iOS app target:
>> 
>> Enumerators:
>> # lgs_error_t
>> 
>> - Name: lgs_error_none
>>   SwiftName: lgs_error_t.none
>> - Name: lgs_error_invalid_handle
>>   SwiftName: lgs_error_t.invalidHandle
>> - Name: lgs_error_null
>>   SwiftName: lgs_error_t.nullParameter
>> - Name: lgs_error_invalid_parameter
>>   SwiftName: lgs_error_t.invalideParameter
>> - Name: lgs_error_invalid_operation
>>   SwiftName: lgs_error_t.invalidOperation
>> - Name: lgs_error_queue_full
>>   SwiftName: lgs_error_t.queueFull
>> 
>> But this line of code fails:
>> 
>> var err: lgs_error_t = .nullParameter
>> Type 'lgs_error_t' has no member 'nullParameter'
>> 
>> Am I missing something else?
>> 
>> > On May 4, 2017, at 16:55 , Douglas Gregor via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> >
>> >
>> >> On May 3, 2017, at 4:10 PM, Geordie J via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> >>
>> >> Hi everyone,
>> >>
>> >> I’m about to start on another big project with Swift on Android and would like to annotate that JNI headers as much as possible before I do: specifically I’d like to make _Nonnull and CF_SWIFT_NAME annotations to the headers found in a user's jni.h.
>> >>
>> >> The question is: is it possible to annotate headers this without changing the original header files? Specifically I’m looking for an options that allows annotations in a separate file, probably one that is read when loading the package’s module.modulemap.
>> >>
>> >> I’d like to distribute the annotations in a SwiftPM package that also exposes the original (hopefully annotated) headers. Up until now I’ve been using Swift to override methods in code, but this isn’t as clean or extensible and I fear it may have other (particularly performance) implications.
>> >>
>> >> I guess the alternative would be to just maintain and distribute a modified version of jni.h with the annotations, but that would be a "last resort” option.
>> >
>> >
>> > This is the role of API notes, which you can see here:
>> >
>> >       https://github.com/apple/swift/tree/master/apinotes <https://github.com/apple/swift/tree/master/apinotes>
>> >
>> > with some rough documentation-in-source here:
>> >
>> >       https://github.com/apple/swift-clang/blob/stable/lib/APINotes/APINotesYAMLCompiler.cpp <https://github.com/apple/swift-clang/blob/stable/lib/APINotes/APINotesYAMLCompiler.cpp>
>> >
>> >       - Doug
>> >
>> > _______________________________________________
>> > swift-users mailing list
>> > swift-users at swift.org <mailto:swift-users at swift.org>
>> > https://lists.swift.org/mailman/listinfo/swift-users <https://lists.swift.org/mailman/listinfo/swift-users>
>> 
>> 
>> --
>> Rick Mann
>> rmann at latencyzero.com <mailto:rmann at latencyzero.com>
>> 
>> 
> 
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