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denoland-deno/ops
Divy Srivastava d5634164cb
chore: use rustfmt imports_granularity option (#17421)
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)
2023-01-14 23:18:58 -05:00
..
optimizer_tests feat(core): Reland support for async ops in realms (#17204) 2023-01-14 14:40:16 +01:00
attrs.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
Cargo.toml chore: forward 1.29.3 release back to main (#17401) 2023-01-13 13:36:51 -05:00
deno.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
fast_call.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
lib.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
optimizer.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00
README.md feat(ops): fast calls for Wasm (#16776) 2022-11-27 19:24:28 +05:30

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 and rv.set calls.
  • -> Result<(), E> skips serde_v8 and rv.set calls for Ok() branch.
  • -> ResourceId or -> [int] types will use specialized method like v8::ReturnValue::set_uint32. A fast path for SMI.
  • -> Result<ResourceId, E> or -> Result<[int], E> types will be optimized like above for the Ok() 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.

Wasm calls

The #[op(wasm)] attribute should be used for calls expected to be called from Wasm. This enables the fast call generation and allows seamless WasmMemory integration for generic and fast calls.

#[op(wasm)]
pub fn op_args_get(
  offset: i32,
  buffer_offset: i32,
  memory: Option<&[u8]>, // Must be last parameter. Some(..) when entered from Wasm.
) {
  // ...
}