Function calls #507
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Function calls #507
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napi automatically wraps and unwraps the `data` pointer on functions created through `napi_create_function`, so we don't need to use the `napi_create_external` API in neon-runtime. Instead we can work with the raw pointers. This aligns the C++ and n-api APIs so that the `neon` crate can just assume associated data for a function is always a raw pointer.
napi expects you to return a `napi_value` from your functions, instead of using `SetReturn` like in nan. I ended up having to duplicate these `invoke` implementations after all!
dherman
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Jun 13, 2020
dherman
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Looks like CI is passing, Travis just somehow isn't updating the PR. Merged! 🎉🎉🎉🎉🎉 |
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Implements most simple function calls between Rust and JS code. (no thread-safe callbacks yet!) Builds on #493.
With function calls, we can start porting tests from the legacy runtime to n-api. I ported tests for objects and functions here.
There are some notable differences between NAN and n-api in how they deal with functions.
v8::Externalvalue. n-api also unwraps it for you when you ask for the data pointer. To align the two runtimes, I moved the unwrapping of thev8::Externalfor the NAN runtime intoneon-sys. Functions that were used to get data out from thev8::Externalvalue now take void pointers.get_dynamic_callback()is now a no-op but I left it in so the data format can be changed later.SetReturn()to set the return value for a function call. With n-api, you can return annapi_valuefrom your functions instead. The n-api runtime gets its ownCallbackimpl andneon_runtime::call::set_returnis unused.undefinednapi_value.The
FunctionCallbackInfostructure was one that could only be used as a reference. n-api has an opaquenapi_callback_infotype alias for a pointer, which could not be used in this way. I changedFunctionCallbackInfoto be a pointer instead.FunctionCallbackInfo<'a>, so we can't store it for longer than the actual function call lasts?