mirror of
https://github.com/denoland/deno.git
synced 2024-10-31 09:14:20 -04:00
ca66978a5a
This PR introduces Wasm ops. These calls are optimized for entry from
Wasm land.
The `#[op(wasm)]` attribute is opt-in.
Last parameter `Option<&mut [u8]>` is the memory slice of the Wasm
module *when entered from a Fast API call*. Otherwise, the user is
expected to implement logic to obtain the memory if `None`
```rust
#[op(wasm)]
pub fn op_args_get(
offset: i32,
buffer_offset: i32,
memory: Option<&mut [u8]>,
) {
// ...
}
```
42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
|
|
use syn::{
|
|
parse::{Parse, ParseStream},
|
|
punctuated::Punctuated,
|
|
Error, Ident, Result, Token,
|
|
};
|
|
|
|
#[derive(Copy, Clone, Debug, Default)]
|
|
pub struct Attributes {
|
|
pub is_unstable: bool,
|
|
pub is_v8: bool,
|
|
pub must_be_fast: bool,
|
|
pub deferred: bool,
|
|
pub is_wasm: bool,
|
|
}
|
|
|
|
impl Parse for Attributes {
|
|
fn parse(input: ParseStream) -> Result<Self> {
|
|
let vars = Punctuated::<Ident, Token![,]>::parse_terminated(input)?;
|
|
|
|
let vars: Vec<_> = vars.iter().map(Ident::to_string).collect();
|
|
let vars: Vec<_> = vars.iter().map(String::as_str).collect();
|
|
for var in vars.iter() {
|
|
if !["unstable", "v8", "fast", "deferred", "wasm"].contains(var) {
|
|
return Err(Error::new(
|
|
input.span(),
|
|
"invalid attribute, expected one of: unstable, v8, fast, deferred, wasm",
|
|
));
|
|
}
|
|
}
|
|
|
|
let is_wasm = vars.contains(&"wasm");
|
|
|
|
Ok(Self {
|
|
is_unstable: vars.contains(&"unstable"),
|
|
is_v8: vars.contains(&"v8"),
|
|
deferred: vars.contains(&"deferred"),
|
|
must_be_fast: is_wasm || vars.contains(&"fast"),
|
|
is_wasm,
|
|
})
|
|
}
|
|
}
|