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https://github.com/denoland/deno.git
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04ba709b6e
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.
182 lines
6.5 KiB
Text
182 lines
6.5 KiB
Text
#[allow(non_camel_case_types)]
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///Auto-generated by `deno_ops`, i.e: `#[op]`
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///
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///Use `op_ffi_ptr_of::decl()` to get an op-declaration
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///you can include in a `deno_core::Extension`.
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pub struct op_ffi_ptr_of;
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#[doc(hidden)]
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impl op_ffi_ptr_of {
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pub fn name() -> &'static str {
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stringify!(op_ffi_ptr_of)
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}
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pub fn v8_fn_ptr<'scope, FP>() -> deno_core::v8::FunctionCallback
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where
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FP: FfiPermissions + 'static,
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{
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use deno_core::v8::MapFnTo;
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Self::v8_func::<FP>.map_fn_to()
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}
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pub fn decl<'scope, FP>() -> deno_core::OpDecl
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where
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FP: FfiPermissions + 'static,
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{
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deno_core::OpDecl {
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name: Self::name(),
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v8_fn_ptr: Self::v8_fn_ptr::<FP>(),
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enabled: true,
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fast_fn: Some(
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Box::new(op_ffi_ptr_of_fast::<FP> {
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_phantom: ::std::marker::PhantomData,
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}),
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),
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is_async: false,
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is_unstable: false,
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is_v8: false,
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argc: 2usize,
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}
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}
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#[inline]
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#[allow(clippy::too_many_arguments)]
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fn call<FP>(state: &mut OpState, buf: *const u8, out: &mut [u32])
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where
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FP: FfiPermissions + 'static,
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{}
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pub fn v8_func<'scope, FP>(
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scope: &mut deno_core::v8::HandleScope<'scope>,
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args: deno_core::v8::FunctionCallbackArguments,
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mut rv: deno_core::v8::ReturnValue,
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)
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where
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FP: FfiPermissions + 'static,
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{
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let ctx = unsafe {
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&*(deno_core::v8::Local::<deno_core::v8::External>::cast(args.data()).value()
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as *const deno_core::_ops::OpCtx)
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};
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let arg_0 = {
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let value = args.get(0usize as i32);
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match deno_core::v8::Local::<deno_core::v8::ArrayBuffer>::try_from(value) {
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Ok(b) => {
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if let Some(data) = b.data() {
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data.cast::<u8>().as_ptr()
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} else {
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std::ptr::null::<u8>()
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}
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}
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Err(_) => {
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if let Ok(view)
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= deno_core::v8::Local::<
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deno_core::v8::ArrayBufferView,
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>::try_from(value) {
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let offset = view.byte_offset();
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let buffer = match view.buffer(scope) {
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Some(v) => v,
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None => {
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return deno_core::_ops::throw_type_error(
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scope,
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format!("Expected ArrayBufferView at position {}", 0usize),
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);
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}
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};
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let store = if let Some(data) = buffer.data() {
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data.cast::<u8>().as_ptr()
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} else {
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std::ptr::null_mut::<u8>()
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};
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unsafe { store.add(offset) }
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} else {
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return deno_core::_ops::throw_type_error(
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scope,
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format!("Expected ArrayBufferView at position {}", 0usize),
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);
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}
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}
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}
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};
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let arg_1 = if let Ok(view)
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= deno_core::v8::Local::<
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deno_core::v8::Uint32Array,
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>::try_from(args.get(1usize as i32)) {
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let (offset, len) = (view.byte_offset(), view.byte_length());
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let buffer = match view.buffer(scope) {
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Some(v) => v,
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None => {
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return deno_core::_ops::throw_type_error(
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scope,
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format!("Expected Uint32Array at position {}", 1usize),
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);
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}
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};
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if let Some(data) = buffer.data() {
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let store = data.cast::<u8>().as_ptr();
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unsafe {
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::std::slice::from_raw_parts_mut(
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store.add(offset) as *mut u32,
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len / 4,
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)
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}
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} else {
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&mut []
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}
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} else {
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return deno_core::_ops::throw_type_error(
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scope,
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format!("Expected Uint32Array at position {}", 1usize),
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);
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};
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let result = Self::call::<
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FP,
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>(&mut std::cell::RefCell::borrow_mut(&ctx.state), arg_0, arg_1);
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let op_state = ::std::cell::RefCell::borrow(&*ctx.state);
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op_state.tracker.track_sync(ctx.id);
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}
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}
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struct op_ffi_ptr_of_fast<FP> {
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_phantom: ::std::marker::PhantomData<FP>,
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}
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impl<'scope, FP> deno_core::v8::fast_api::FastFunction for op_ffi_ptr_of_fast<FP>
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where
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FP: FfiPermissions + 'static,
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{
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fn function(&self) -> *const ::std::ffi::c_void {
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op_ffi_ptr_of_fast_fn::<FP> as *const ::std::ffi::c_void
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}
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fn args(&self) -> &'static [deno_core::v8::fast_api::Type] {
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use deno_core::v8::fast_api::Type::*;
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use deno_core::v8::fast_api::CType;
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&[V8Value, TypedArray(CType::Uint8), TypedArray(CType::Uint32), CallbackOptions]
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}
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fn return_type(&self) -> deno_core::v8::fast_api::CType {
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deno_core::v8::fast_api::CType::Void
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}
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}
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fn op_ffi_ptr_of_fast_fn<'scope, FP>(
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_: deno_core::v8::Local<deno_core::v8::Object>,
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buf: *const deno_core::v8::fast_api::FastApiTypedArray<u8>,
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out: *const deno_core::v8::fast_api::FastApiTypedArray<u32>,
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fast_api_callback_options: *mut deno_core::v8::fast_api::FastApiCallbackOptions,
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) -> ()
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where
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FP: FfiPermissions + 'static,
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{
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use deno_core::v8;
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use deno_core::_ops;
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let __opts: &mut v8::fast_api::FastApiCallbackOptions = unsafe {
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&mut *fast_api_callback_options
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};
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let __ctx = unsafe {
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&*(v8::Local::<v8::External>::cast(unsafe { __opts.data.data }).value()
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as *const _ops::OpCtx)
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};
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let state = &mut ::std::cell::RefCell::borrow_mut(&__ctx.state);
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let buf = unsafe { (&*buf).get_storage_if_aligned().unwrap_unchecked() }.as_ptr();
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let out = match unsafe { &*out }.get_storage_if_aligned() {
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Some(v) => v,
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None => {
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unsafe { &mut *fast_api_callback_options }.fallback = true;
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return Default::default();
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}
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};
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let result = op_ffi_ptr_of::call::<FP>(state, buf, out);
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result
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}
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