| # Add support for a new function attribute |
| |
| To add support for a new function attribute in libgccjit, you need to do the following steps: |
| |
| 1. Copy the corresponding function from `c-family/c-attribs.cc` into `jit/dummy-frontend.cc`. For example if you add the `target` attribute, the function name will be `handle_target_attribute`. |
| 2. Copy the corresponding entry from the `c_common_attribute_table` variable in the `c-family/c-attribs.cc` file into the `jit_attribute_table` variable in `jit/dummy-frontend.cc`. |
| 3. Add a new variant in the `gcc_jit_fn_attribute` enum in the `jit/libgccjit.h` file. |
| 4. Add a test to ensure the attribute is correctly applied in `gcc/testsuite/jit.dg/`. Take a look at `gcc/testsuite/jit.dg/test-nonnull.c` if you want an example. |
| 5. Run the example like this (in your `gcc-build` folder): `make check-jit RUNTESTFLAGS="-v -v -v jit.exp=jit.dg/test-nonnull.c"` |
| |
| Once done, you need to update the [gccjit.rs] crate to add the new enum variant in the corresponding enum (`FnAttribute`). |
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| Finally, you need to update this repository by calling the relevant API you added in [gccjit.rs]. |
| |
| To test it, build `gcc`, run `cargo update -p gccjit` and then you can test the generated output for a given Rust crate. |
| |
| [gccjit.rs]: https://github.com/rust-lang/gccjit.rs |
