mirror of
https://github.com/denoland/deno.git
synced 2024-11-25 15:29:32 -05:00
fa22956a86
Follow-up to #16208. - Refactors build.rs behaviour to use `-exported_symbols_list` / `--export-dynamic-symbol-list` - Since all build systems now rely on a symbols list file, I have added `generate_exported_symbols_list`, which derives the symbol list file depending on the platform, which makes `tools/napi/generate_link_win.js` redundant. - Fixes a missed instance of `i8` being used instead of `c_char` Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
34 lines
1,020 B
Markdown
34 lines
1,020 B
Markdown
# 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`](./symbol_exports.json).
|
|
- Maps `deno_napi::Result` to raw `napi_result`.
|
|
|
|
```rust
|
|
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`](../build.rs).
|
|
|
|
On Windows, you need to generate the `.def` file by running
|
|
[`tools/napi/generate_symbols_lists.js`](../../tools/napi/generate_symbols_lists.js).
|