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Closes https://github.com/denoland/deno/issues/2699 Closes https://github.com/denoland/deno/issues/2347 Uses unstable rustfmt features. Since dprint invokes `rustfmt` we do not need to switch the cargo toolchain to nightly. Do we care about formatting stability of our codebase across Rust versions? (I don't)
37 lines
1 KiB
Markdown
37 lines
1 KiB
Markdown
# napi_sym
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A proc_macro for Deno's Node-API implementation. It does the following things:
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- Marks the symbol as `#[no_mangle]` and rewrites it as `pub extern "C" $name`.
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- Asserts that the function symbol is present in
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[`symbol_exports.json`](./symbol_exports.json).
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- Maps `deno_napi::Result` to raw `napi_result`.
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```rust
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use deno_napi::napi_value;
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use deno_napi::Env;
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use deno_napi::Error;
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use deno_napi::Result;
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#[napi_sym::napi_sym]
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fn napi_get_boolean(
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env: *mut Env,
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value: bool,
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result: *mut napi_value,
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) -> Result {
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let _env: &mut Env = env.as_mut().ok_or(Error::InvalidArg)?;
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// *result = ...
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Ok(())
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}
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```
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### `symbol_exports.json`
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A file containing the symbols that need to be put into the executable's dynamic
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symbol table at link-time.
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This is done using `/DEF:` on Windows, `-exported_symbol,_` on macOS and
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`--export-dynamic-symbol=` on Linux. See [`cli/build.rs`](../build.rs).
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On Windows, you need to generate the `.def` file by running
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[`tools/napi/generate_symbols_lists.js`](../../tools/napi/generate_symbols_lists.js).
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