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denoland-deno/cli/napi/sym
denobot 04ba8df711
1.39.0 (#21560)
Bumped versions for 1.39.0

Please ensure:
- [x] Target branch is correct (`vX.XX` if a patch release, `main` if
minor)
- [x] Crate versions are bumped correctly
- [x] deno_std version is incremented in the code (see
`cli/deno_std.rs`)
- [x] Releases.md is updated correctly (think relevancy and remove
reverts)

To make edits to this PR:
```shell
git fetch upstream release_1_39.0 && git checkout -b release_1_39.0 upstream/release_1_39.0
```

cc @mmastrac

---------

Co-authored-by: mmastrac <mmastrac@users.noreply.github.com>
Co-authored-by: Matt Mastracci <matthew@mastracci.com>
2023-12-13 13:24:13 -07:00
..
Cargo.toml 1.39.0 (#21560) 2023-12-13 13:24:13 -07:00
lib.rs refactor(napi): simplify types (#19179) 2023-05-18 16:17:53 +02:00
README.md chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
symbol_exports.json refactor: create util folder, move nap_sym to napi/sym, move http_cache to cache folder (#16857) 2022-11-28 17:28:54 -05:00

napi_sym

A proc_macro for Deno's Node-API implementation. It does the following things:

  • Marks the symbol as #[no_mangle] and rewrites it as pub extern "C" $name.
  • Asserts that the function symbol is present in symbol_exports.json.
  • Maps deno_napi::Result to raw napi_result.
use deno_napi::napi_value;
use deno_napi::Env;
use deno_napi::Error;
use deno_napi::Result;

#[napi_sym::napi_sym]
fn napi_get_boolean(
  env: *mut Env,
  value: bool,
  result: *mut napi_value,
) -> Result {
  let _env: &mut Env = env.as_mut().ok_or(Error::InvalidArg)?;
  // *result = ...
  Ok(())
}

symbol_exports.json

A file containing the symbols that need to be put into the executable's dynamic symbol table at link-time.

This is done using /DEF: on Windows, -exported_symbol,_ on macOS and --export-dynamic-symbol= on Linux. See cli/build.rs.

On Windows, you need to generate the .def file by running tools/napi/generate_symbols_lists.js.