wr-binding has become into https://github.com/rlhunt/cbindgen/
This project can be used to generate C bindings for rust code. In particular it will be used for generating a C API for webrender.
Steps to use:
- cargo run path/to/mozilla/gfx/webrender_bindings > path/to/mozilla/gfx/webrender_bindings/webrender_ffi_generated.h
- Compile and test your mozilla build. Deal with any errors by fixing the wr-binding generator or other things in the mozilla tree.
The first step above will spew a bunch of output to stderr - you can ignore it unless the run fails. The way wr-binding works
is by processing the .rs files and looking for function signatures with the no_mangle attribute on them. These functions will
have C signatures generated. Furthermore, the generator looks for structs with repr(C) and enums with repr(u32), and if they
are used by the no_mangle functions, generates bindings for those as well. If you try to use a struct that is not repr(C) or
an enum that is not repr(u32) the generator will just ignore it and you will probably get a build failure in your mozilla
tree.
Future work:
- Make wr-binding generate even more things, so that webrender_ffi.h is minimal.