mirror of
https://github.com/denoland/deno.git
synced 2025-01-23 23:49:46 -05:00
47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
|
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
|
||
|
|
|
||
|
|
use proc_macro::TokenStream;
|
||
|
|
use quote::quote;
|
||
|
|
use serde::Deserialize;
|
||
|
|
|
||
|
|
static NAPI_EXPORTS: &str =
|
||
|
|
include_str!("../../tools/napi/symbol_exports.json");
|
||
|
|
|
||
|
|
#[derive(Deserialize)]
|
||
|
|
struct SymbolExports {
|
||
|
|
pub symbols: Vec<String>,
|
||
|
|
}
|
||
|
|
|
||
|
|
#[proc_macro_attribute]
|
||
|
|
pub fn napi_sym(_attr: TokenStream, item: TokenStream) -> TokenStream {
|
||
|
|
let func = syn::parse::<syn::ItemFn>(item).expect("expected a function");
|
||
|
|
|
||
|
|
let exports: SymbolExports =
|
||
|
|
serde_json::from_str(NAPI_EXPORTS).expect("failed to parse exports");
|
||
|
|
let name = &func.sig.ident;
|
||
|
|
assert!(
|
||
|
|
exports.symbols.contains(&name.to_string()),
|
||
|
|
"tools/napi/symbol_exports.json is out of sync!"
|
||
|
|
);
|
||
|
|
|
||
|
|
let block = &func.block;
|
||
|
|
let inputs = &func.sig.inputs;
|
||
|
|
let output = &func.sig.output;
|
||
|
|
let ret_ty = match output {
|
||
|
|
syn::ReturnType::Default => panic!("expected a return type"),
|
||
|
|
syn::ReturnType::Type(_, ty) => quote! { #ty },
|
||
|
|
};
|
||
|
|
TokenStream::from(quote! {
|
||
|
|
// SAFETY: it's an NAPI function.
|
||
|
|
#[no_mangle]
|
||
|
|
pub unsafe extern "C" fn #name(#inputs) -> napi_status {
|
||
|
|
let mut inner = || -> #ret_ty {
|
||
|
|
#block
|
||
|
|
};
|
||
|
|
inner()
|
||
|
|
.map(|_| napi_ok)
|
||
|
|
.unwrap_or_else(|e| e.into())
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|