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denoland-deno/ops/optimizer_tests/raw_ptr.out
Aapo Alasuutari 04ba709b6e
perf(ops): Remove unnecessary fast call fallback options usage (#17585)
Currently fast ops will always check for the alignment of a TypedArray
when getting a slice out of them. A match is then done to ensure that
some slice was received and if not a fallback will be requested.

For Uint8Arrays (and WasmMemory which is equivalent to a Uint8Array) the
alignment will always be okay. Rust probably optimises this away for the
most part (since the Uint8Array check is `x % 1 != 0`), but what it
cannot optimise away is the fast ops path's request for fallback options
parameter.

The extra parameter's cost is likely negligible but V8 will need to
check if a fallback was requested and prepare the fallback call just in
case it was. In the future the lack of a fallback may also enable V8 to
much better optimise the result handling.

For V8 created buffers, it seems like all buffers are actually always
guaranteed to be properly aligned: All buffers seem to always be created
8-byte aligned, and creating a 32 bit array or 64 bit array with a
non-aligned offset from an ArrayBuffer is not allowed. Unfortunately,
Deno FFI cannot give the same guarantees, and it is actually possible
for eg. 32 bit arrays to be created unaligned using it. These arrays
work fine (at least on Linux) so it seems like this is not illegal, it
just means that we cannot remove the alignment checking for 32 bit
arrays.
2023-01-29 19:35:08 +05:30

182 lines
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#[allow(non_camel_case_types)]
///Auto-generated by `deno_ops`, i.e: `#[op]`
///
///Use `op_ffi_ptr_of::decl()` to get an op-declaration
///you can include in a `deno_core::Extension`.
pub struct op_ffi_ptr_of;
#[doc(hidden)]
impl op_ffi_ptr_of {
pub fn name() -> &'static str {
stringify!(op_ffi_ptr_of)
}
pub fn v8_fn_ptr<'scope, FP>() -> deno_core::v8::FunctionCallback
where
FP: FfiPermissions + 'static,
{
use deno_core::v8::MapFnTo;
Self::v8_func::<FP>.map_fn_to()
}
pub fn decl<'scope, FP>() -> deno_core::OpDecl
where
FP: FfiPermissions + 'static,
{
deno_core::OpDecl {
name: Self::name(),
v8_fn_ptr: Self::v8_fn_ptr::<FP>(),
enabled: true,
fast_fn: Some(
Box::new(op_ffi_ptr_of_fast::<FP> {
_phantom: ::std::marker::PhantomData,
}),
),
is_async: false,
is_unstable: false,
is_v8: false,
argc: 2usize,
}
}
#[inline]
#[allow(clippy::too_many_arguments)]
fn call<FP>(state: &mut OpState, buf: *const u8, out: &mut [u32])
where
FP: FfiPermissions + 'static,
{}
pub fn v8_func<'scope, FP>(
scope: &mut deno_core::v8::HandleScope<'scope>,
args: deno_core::v8::FunctionCallbackArguments,
mut rv: deno_core::v8::ReturnValue,
)
where
FP: FfiPermissions + 'static,
{
let ctx = unsafe {
&*(deno_core::v8::Local::<deno_core::v8::External>::cast(args.data()).value()
as *const deno_core::_ops::OpCtx)
};
let arg_0 = {
let value = args.get(0usize as i32);
match deno_core::v8::Local::<deno_core::v8::ArrayBuffer>::try_from(value) {
Ok(b) => {
if let Some(data) = b.data() {
data.cast::<u8>().as_ptr()
} else {
std::ptr::null::<u8>()
}
}
Err(_) => {
if let Ok(view)
= deno_core::v8::Local::<
deno_core::v8::ArrayBufferView,
>::try_from(value) {
let offset = view.byte_offset();
let buffer = match view.buffer(scope) {
Some(v) => v,
None => {
return deno_core::_ops::throw_type_error(
scope,
format!("Expected ArrayBufferView at position {}", 0usize),
);
}
};
let store = if let Some(data) = buffer.data() {
data.cast::<u8>().as_ptr()
} else {
std::ptr::null_mut::<u8>()
};
unsafe { store.add(offset) }
} else {
return deno_core::_ops::throw_type_error(
scope,
format!("Expected ArrayBufferView at position {}", 0usize),
);
}
}
}
};
let arg_1 = if let Ok(view)
= deno_core::v8::Local::<
deno_core::v8::Uint32Array,
>::try_from(args.get(1usize as i32)) {
let (offset, len) = (view.byte_offset(), view.byte_length());
let buffer = match view.buffer(scope) {
Some(v) => v,
None => {
return deno_core::_ops::throw_type_error(
scope,
format!("Expected Uint32Array at position {}", 1usize),
);
}
};
if let Some(data) = buffer.data() {
let store = data.cast::<u8>().as_ptr();
unsafe {
::std::slice::from_raw_parts_mut(
store.add(offset) as *mut u32,
len / 4,
)
}
} else {
&mut []
}
} else {
return deno_core::_ops::throw_type_error(
scope,
format!("Expected Uint32Array at position {}", 1usize),
);
};
let result = Self::call::<
FP,
>(&mut std::cell::RefCell::borrow_mut(&ctx.state), arg_0, arg_1);
let op_state = ::std::cell::RefCell::borrow(&*ctx.state);
op_state.tracker.track_sync(ctx.id);
}
}
struct op_ffi_ptr_of_fast<FP> {
_phantom: ::std::marker::PhantomData<FP>,
}
impl<'scope, FP> deno_core::v8::fast_api::FastFunction for op_ffi_ptr_of_fast<FP>
where
FP: FfiPermissions + 'static,
{
fn function(&self) -> *const ::std::ffi::c_void {
op_ffi_ptr_of_fast_fn::<FP> as *const ::std::ffi::c_void
}
fn args(&self) -> &'static [deno_core::v8::fast_api::Type] {
use deno_core::v8::fast_api::Type::*;
use deno_core::v8::fast_api::CType;
&[V8Value, TypedArray(CType::Uint8), TypedArray(CType::Uint32), CallbackOptions]
}
fn return_type(&self) -> deno_core::v8::fast_api::CType {
deno_core::v8::fast_api::CType::Void
}
}
fn op_ffi_ptr_of_fast_fn<'scope, FP>(
_: deno_core::v8::Local<deno_core::v8::Object>,
buf: *const deno_core::v8::fast_api::FastApiTypedArray<u8>,
out: *const deno_core::v8::fast_api::FastApiTypedArray<u32>,
fast_api_callback_options: *mut deno_core::v8::fast_api::FastApiCallbackOptions,
) -> ()
where
FP: FfiPermissions + 'static,
{
use deno_core::v8;
use deno_core::_ops;
let __opts: &mut v8::fast_api::FastApiCallbackOptions = unsafe {
&mut *fast_api_callback_options
};
let __ctx = unsafe {
&*(v8::Local::<v8::External>::cast(unsafe { __opts.data.data }).value()
as *const _ops::OpCtx)
};
let state = &mut ::std::cell::RefCell::borrow_mut(&__ctx.state);
let buf = unsafe { (&*buf).get_storage_if_aligned().unwrap_unchecked() }.as_ptr();
let out = match unsafe { &*out }.get_storage_if_aligned() {
Some(v) => v,
None => {
unsafe { &mut *fast_api_callback_options }.fallback = true;
return Default::default();
}
};
let result = op_ffi_ptr_of::call::<FP>(state, buf, out);
result
}