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https://github.com/denoland/deno.git
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5b9620df7a
Implements fast scheduling of deferred op futures.
```rs
#[op(fast)]
async fn op_read(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
buf: &mut [u8],
) -> Result<u32, Error> {
// ...
}
```
The future is scheduled via a fast API call and polled by the event loop
after being woken up by its waker.
|
||
|---|---|---|
| .. | ||
| optimizer_tests | ||
| tests | ||
| attrs.rs | ||
| Cargo.toml | ||
| deno.rs | ||
| fast_call.rs | ||
| lib.rs | ||
| optimizer.rs | ||
| README.md | ||
deno_ops
proc_macro for generating highly optimized V8 functions from Deno ops.
// Declare an op.
#[op(fast)]
pub fn op_add(_: &mut OpState, a: i32, b: i32) -> i32 {
a + b
}
// Register with an extension.
Extension::builder()
.ops(vec![op_add::decl()])
.build();
Performance
The macro can optimize away code, short circuit fast paths and generate a Fast API impl.
Cases where code is optimized away:
-> ()skips serde_v8 andrv.setcalls.-> Result<(), E>skips serde_v8 andrv.setcalls forOk()branch.-> ResourceIdor-> [int]types will use specialized method likev8::ReturnValue::set_uint32. A fast path for SMI.-> Result<ResourceId, E>or-> Result<[int], E>types will be optimized like above for theOk()branch.
Fast calls
The macro will infer and try to auto generate V8 fast API call trait impl for
sync ops with:
- arguments: integers, bool,
&mut OpState,&[u8], &mut [u8],&[u32],&mut [u32]` - return_type: integers, bool
The #[op(fast)] attribute should be used to enforce fast call generation at
compile time.
Trait gen for async ops & a ZeroCopyBuf equivalent type is planned and will be
added soon.