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denoland-deno/cli/napi_sym
denobot c08fcd96c1
chore: forward v1.27.2 release commit to main (#16572)
Co-authored-by: bartlomieju <bartlomieju@users.noreply.github.com>
2022-11-09 00:27:51 +01:00
..
Cargo.toml chore: forward v1.27.2 release commit to main (#16572) 2022-11-09 00:27:51 +01:00
lib.rs fix(napi): move napi symbols file (#16179) 2022-10-07 09:21:43 +05:30
README.md refactor(build): better handle old glibc (#16238) 2022-10-15 20:51:04 +05:30
symbol_exports.json fix(napi): move napi symbols file (#16179) 2022-10-07 09:21:43 +05:30

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, Env, Error, 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.