mirror of
https://github.com/denoland/deno.git
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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.
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use syn::{
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parse::{Parse, ParseStream},
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punctuated::Punctuated,
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Error, Ident, Result, Token,
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};
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#[derive(Copy, Clone, Debug, Default)]
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pub struct Attributes {
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pub is_unstable: bool,
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pub is_v8: bool,
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pub must_be_fast: bool,
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pub deferred: bool,
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pub is_wasm: bool,
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}
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impl Parse for Attributes {
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fn parse(input: ParseStream) -> Result<Self> {
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let vars = Punctuated::<Ident, Token![,]>::parse_terminated(input)?;
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let vars: Vec<_> = vars.iter().map(Ident::to_string).collect();
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let vars: Vec<_> = vars.iter().map(String::as_str).collect();
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for var in vars.iter() {
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if !["unstable", "v8", "fast", "deferred", "wasm"].contains(var) {
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return Err(Error::new(
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input.span(),
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"invalid attribute, expected one of: unstable, v8, fast, deferred, wasm",
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));
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}
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}
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let is_wasm = vars.contains(&"wasm");
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Ok(Self {
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is_unstable: vars.contains(&"unstable"),
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is_v8: vars.contains(&"v8"),
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deferred: vars.contains(&"deferred"),
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must_be_fast: is_wasm || vars.contains(&"fast"),
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is_wasm,
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})
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}
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}
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