mirror of
https://github.com/denoland/deno.git
synced 2024-10-29 08:58:01 -04:00
671 lines
18 KiB
Rust
671 lines
18 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use attrs::Attributes;
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use once_cell::sync::Lazy;
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use optimizer::{BailoutReason, Optimizer};
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use proc_macro::TokenStream;
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use proc_macro2::{Span, TokenStream as TokenStream2};
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use quote::{quote, ToTokens};
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use regex::Regex;
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use syn::{
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parse, parse_macro_input, punctuated::Punctuated, token::Comma, FnArg,
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GenericParam, Ident, ItemFn, Lifetime, LifetimeDef,
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};
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mod attrs;
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mod deno;
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mod fast_call;
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mod optimizer;
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const SCOPE_LIFETIME: &str = "'scope";
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/// Add the 'scope lifetime to the function signature.
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fn add_scope_lifetime(func: &mut ItemFn) {
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let span = Span::call_site();
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let lifetime = LifetimeDef::new(Lifetime::new(SCOPE_LIFETIME, span));
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let generics = &mut func.sig.generics;
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if !generics.lifetimes().any(|def| *def == lifetime) {
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generics.params.push(GenericParam::Lifetime(lifetime));
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}
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}
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struct Op {
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orig: ItemFn,
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item: ItemFn,
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/// Is this an async op?
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/// - `async fn`
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/// - returns a Future
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is_async: bool,
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type_params: Punctuated<GenericParam, Comma>,
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// optimizer: Optimizer,
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core: TokenStream2,
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attrs: Attributes,
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}
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impl Op {
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fn new(mut item: ItemFn, attrs: Attributes) -> Self {
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// Preserve the original function. Change the name to `call`.
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//
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// impl op_foo {
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// fn call() {}
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// ...
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// }
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let mut orig = item.clone();
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orig.sig.ident = Ident::new("call", Span::call_site());
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add_scope_lifetime(&mut item);
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let is_async = item.sig.asyncness.is_some() || is_future(&item.sig.output);
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let type_params = exclude_lifetime_params(&item.sig.generics.params);
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#[cfg(test)]
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let core = quote!(deno_core);
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#[cfg(not(test))]
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let core = deno::import();
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Self {
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orig,
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item,
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type_params,
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is_async,
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core,
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attrs,
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}
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}
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fn gen(mut self) -> TokenStream2 {
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let mut optimizer = Optimizer::new();
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match optimizer.analyze(&mut self) {
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Ok(_) | Err(BailoutReason::MustBeSingleSegment) => {}
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Err(BailoutReason::FastUnsupportedParamType) => {
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optimizer.fast_compatible = false;
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}
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};
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let Self {
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core,
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item,
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is_async,
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orig,
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attrs,
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type_params,
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} = self;
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let name = &item.sig.ident;
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let generics = &item.sig.generics;
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let where_clause = &item.sig.generics.where_clause;
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// First generate fast call bindings to opt-in to error handling in slow call
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let fast_call::FastImplItems {
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impl_and_fn,
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decl,
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active,
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} = fast_call::generate(&core, &mut optimizer, &item);
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let has_fallible_fast_call = active && optimizer.returns_result;
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let (v8_body, argc) = if is_async {
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codegen_v8_async(
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&core,
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&item,
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attrs,
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item.sig.asyncness.is_some(),
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attrs.deferred,
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)
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} else {
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codegen_v8_sync(&core, &item, attrs, has_fallible_fast_call)
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};
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let is_v8 = attrs.is_v8;
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let is_unstable = attrs.is_unstable;
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let docline = format!("Use `{name}::decl()` to get an op-declaration");
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// Generate wrapper
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quote! {
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#[allow(non_camel_case_types)]
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#[doc="Auto-generated by `deno_ops`, i.e: `#[op]`"]
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#[doc=""]
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#[doc=#docline]
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#[doc="you can include in a `deno_core::Extension`."]
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pub struct #name;
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#[doc(hidden)]
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impl #name {
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pub fn name() -> &'static str {
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stringify!(#name)
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}
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pub fn v8_fn_ptr #generics () -> #core::v8::FunctionCallback #where_clause {
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use #core::v8::MapFnTo;
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Self::v8_func::<#type_params>.map_fn_to()
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}
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pub fn decl #generics () -> #core::OpDecl #where_clause {
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#core::OpDecl {
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name: Self::name(),
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v8_fn_ptr: Self::v8_fn_ptr::<#type_params>(),
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enabled: true,
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fast_fn: #decl,
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is_async: #is_async,
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is_unstable: #is_unstable,
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is_v8: #is_v8,
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argc: #argc,
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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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#orig
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pub fn v8_func #generics (
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scope: &mut #core::v8::HandleScope<'scope>,
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args: #core::v8::FunctionCallbackArguments,
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mut rv: #core::v8::ReturnValue,
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) #where_clause {
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#v8_body
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}
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}
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#impl_and_fn
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}
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}
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}
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#[proc_macro_attribute]
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pub fn op(attr: TokenStream, item: TokenStream) -> TokenStream {
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let margs = parse_macro_input!(attr as Attributes);
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let func = parse::<ItemFn>(item).expect("expected a function");
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let op = Op::new(func, margs);
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op.gen().into()
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}
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/// Generate the body of a v8 func for an async op
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fn codegen_v8_async(
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core: &TokenStream2,
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f: &syn::ItemFn,
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margs: Attributes,
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asyncness: bool,
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deferred: bool,
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) -> (TokenStream2, usize) {
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let Attributes { is_v8, .. } = margs;
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let special_args = f
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.sig
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.inputs
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.iter()
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.map_while(|a| {
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(if is_v8 { scope_arg(a) } else { None }).or_else(|| opstate_arg(a))
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})
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.collect::<Vec<_>>();
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let rust_i0 = special_args.len();
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let args_head = special_args.into_iter().collect::<TokenStream2>();
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let (arg_decls, args_tail, argc) = codegen_args(core, f, rust_i0, 1);
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let type_params = exclude_lifetime_params(&f.sig.generics.params);
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let (pre_result, mut result_fut) = match asyncness {
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true => (
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quote! {},
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quote! { Self::call::<#type_params>(#args_head #args_tail).await; },
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),
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false => (
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quote! { let result_fut = Self::call::<#type_params>(#args_head #args_tail); },
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quote! { result_fut.await; },
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),
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};
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let result_wrapper = match is_result(&f.sig.output) {
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true => {
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// Support `Result<impl Future<Output = Result<T, AnyError>> + 'static, AnyError>`
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if !asyncness {
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result_fut = quote! { result_fut; };
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quote! {
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let result = match result {
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Ok(fut) => fut.await,
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Err(e) => return (promise_id, op_id, #core::_ops::to_op_result::<()>(get_class, Err(e))),
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};
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}
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} else {
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quote! {}
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}
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}
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false => quote! { let result = Ok(result); },
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};
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(
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quote! {
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use #core::futures::FutureExt;
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// SAFETY: #core guarantees args.data() is a v8 External pointing to an OpCtx for the isolates lifetime
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let ctx = unsafe {
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&*(#core::v8::Local::<#core::v8::External>::cast(args.data()).value()
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as *const #core::_ops::OpCtx)
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};
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let op_id = ctx.id;
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let promise_id = args.get(0);
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let promise_id = #core::v8::Local::<#core::v8::Integer>::try_from(promise_id)
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.map(|l| l.value() as #core::PromiseId)
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.map_err(#core::anyhow::Error::from);
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// Fail if promise id invalid (not an int)
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let promise_id: #core::PromiseId = match promise_id {
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Ok(promise_id) => promise_id,
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Err(err) => {
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#core::_ops::throw_type_error(scope, format!("invalid promise id: {}", err));
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return;
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}
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};
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#arg_decls
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// Track async call & get copy of get_error_class_fn
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let get_class = {
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let state = ::std::cell::RefCell::borrow(&ctx.state);
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state.tracker.track_async(op_id);
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state.get_error_class_fn
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};
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#pre_result
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#core::_ops::queue_async_op(ctx, scope, #deferred, async move {
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let result = #result_fut
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#result_wrapper
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(promise_id, op_id, #core::_ops::to_op_result(get_class, result))
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});
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},
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argc,
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)
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}
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fn scope_arg(arg: &FnArg) -> Option<TokenStream2> {
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if is_handle_scope(arg) {
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Some(quote! { scope, })
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} else {
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None
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}
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}
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fn opstate_arg(arg: &FnArg) -> Option<TokenStream2> {
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match arg {
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arg if is_rc_refcell_opstate(arg) => Some(quote! { ctx.state.clone(), }),
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arg if is_mut_ref_opstate(arg) => {
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Some(quote! { &mut std::cell::RefCell::borrow_mut(&ctx.state), })
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}
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_ => None,
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}
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}
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/// Generate the body of a v8 func for a sync op
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fn codegen_v8_sync(
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core: &TokenStream2,
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f: &syn::ItemFn,
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margs: Attributes,
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has_fallible_fast_call: bool,
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) -> (TokenStream2, usize) {
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let Attributes { is_v8, .. } = margs;
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let special_args = f
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.sig
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.inputs
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.iter()
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.map_while(|a| {
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(if is_v8 { scope_arg(a) } else { None }).or_else(|| opstate_arg(a))
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})
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.collect::<Vec<_>>();
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let rust_i0 = special_args.len();
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let args_head = special_args.into_iter().collect::<TokenStream2>();
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let (arg_decls, args_tail, argc) = codegen_args(core, f, rust_i0, 0);
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let ret = codegen_sync_ret(core, &f.sig.output);
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let type_params = exclude_lifetime_params(&f.sig.generics.params);
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let fast_error_handler = if has_fallible_fast_call {
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quote! {
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{
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let op_state = &mut std::cell::RefCell::borrow_mut(&ctx.state);
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if let Some(err) = op_state.last_fast_op_error.take() {
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let exception = #core::error::to_v8_error(scope, op_state.get_error_class_fn, &err);
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scope.throw_exception(exception);
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return;
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}
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}
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}
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} else {
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quote! {}
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};
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(
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quote! {
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// SAFETY: #core guarantees args.data() is a v8 External pointing to an OpCtx for the isolates lifetime
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let ctx = unsafe {
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&*(#core::v8::Local::<#core::v8::External>::cast(args.data()).value()
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as *const #core::_ops::OpCtx)
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};
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#fast_error_handler
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#arg_decls
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let result = Self::call::<#type_params>(#args_head #args_tail);
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// use RefCell::borrow instead of state.borrow to avoid clash with std::borrow::Borrow
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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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#ret
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},
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argc,
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)
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}
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/// (full declarations, idents, v8 argument count)
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type ArgumentDecl = (TokenStream2, TokenStream2, usize);
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fn codegen_args(
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core: &TokenStream2,
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f: &syn::ItemFn,
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rust_i0: usize, // Index of first generic arg in rust
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v8_i0: usize, // Index of first generic arg in v8/js
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) -> ArgumentDecl {
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let inputs = &f.sig.inputs.iter().skip(rust_i0).enumerate();
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let ident_seq: TokenStream2 = inputs
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.clone()
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.map(|(i, _)| format!("arg_{i}"))
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.collect::<Vec<_>>()
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.join(", ")
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.parse()
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.unwrap();
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let decls: TokenStream2 = inputs
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.clone()
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.map(|(i, arg)| {
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codegen_arg(core, arg, format!("arg_{i}").as_ref(), v8_i0 + i)
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})
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.collect();
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(decls, ident_seq, inputs.len())
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}
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fn codegen_arg(
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core: &TokenStream2,
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arg: &syn::FnArg,
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name: &str,
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idx: usize,
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) -> TokenStream2 {
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let ident = quote::format_ident!("{name}");
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let (pat, ty) = match arg {
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syn::FnArg::Typed(pat) => {
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if is_optional_fast_callback_option(&pat.ty) {
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return quote! { let #ident = None; };
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}
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(&pat.pat, &pat.ty)
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}
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_ => unreachable!(),
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};
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// Fast path if arg should be skipped
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if matches!(**pat, syn::Pat::Wild(_)) {
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return quote! { let #ident = (); };
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}
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// Fast path for `String`
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if is_string(&**ty) {
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return quote! {
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let #ident = match #core::v8::Local::<#core::v8::String>::try_from(args.get(#idx as i32)) {
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Ok(v8_string) => #core::serde_v8::to_utf8(v8_string, scope),
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Err(_) => {
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return #core::_ops::throw_type_error(scope, format!("Expected string at position {}", #idx));
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}
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};
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};
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}
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// Fast path for `Option<String>`
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if is_option_string(&**ty) {
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return quote! {
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let #ident = match #core::v8::Local::<#core::v8::String>::try_from(args.get(#idx as i32)) {
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Ok(v8_string) => Some(#core::serde_v8::to_utf8(v8_string, scope)),
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Err(_) => None
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};
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};
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}
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// Fast path for &/&mut [u8] and &/&mut [u32]
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match is_ref_slice(&**ty) {
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None => {}
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Some(SliceType::U32Mut) => {
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let blck = codegen_u32_mut_slice(core, idx);
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return quote! {
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let #ident = #blck;
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};
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}
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Some(_) => {
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let blck = codegen_u8_slice(core, idx);
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return quote! {
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let #ident = #blck;
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};
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}
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}
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// Otherwise deserialize it via serde_v8
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quote! {
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let #ident = args.get(#idx as i32);
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let #ident = match #core::serde_v8::from_v8(scope, #ident) {
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Ok(v) => v,
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Err(err) => {
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let msg = format!("Error parsing args at position {}: {}", #idx, #core::anyhow::Error::from(err));
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return #core::_ops::throw_type_error(scope, msg);
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}
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};
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}
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}
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fn codegen_u8_slice(core: &TokenStream2, idx: usize) -> TokenStream2 {
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quote! {{
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let value = args.get(#idx as i32);
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match #core::v8::Local::<#core::v8::ArrayBuffer>::try_from(value) {
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Ok(b) => {
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// Handles detached buffers.
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let byte_length = b.byte_length();
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let store = b.data() as *mut u8;
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// SAFETY: rust guarantees that lifetime of slice is no longer than the call.
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unsafe { ::std::slice::from_raw_parts_mut(store, byte_length) }
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},
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Err(_) => {
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if let Ok(view) = #core::v8::Local::<#core::v8::ArrayBufferView>::try_from(value) {
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let len = view.byte_length();
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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 #core::_ops::throw_type_error(scope, format!("Expected ArrayBufferView at position {}", #idx));
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}
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};
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let store = buffer.data() as *mut u8;
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// SAFETY: rust guarantees that lifetime of slice is no longer than the call.
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unsafe { ::std::slice::from_raw_parts_mut(store.add(offset), len) }
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} else {
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return #core::_ops::throw_type_error(scope, format!("Expected ArrayBufferView at position {}", #idx));
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}
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}
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}}
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}
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}
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fn codegen_u32_mut_slice(core: &TokenStream2, idx: usize) -> TokenStream2 {
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quote! {
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if let Ok(view) = #core::v8::Local::<#core::v8::Uint32Array>::try_from(args.get(#idx 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 #core::_ops::throw_type_error(scope, format!("Expected Uint32Array at position {}", #idx));
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}
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};
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let store = buffer.data() as *mut u8;
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// SAFETY: buffer from Uint32Array. Rust guarantees that lifetime of slice is no longer than the call.
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unsafe { ::std::slice::from_raw_parts_mut(store.add(offset) as *mut u32, len / 4) }
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} else {
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return #core::_ops::throw_type_error(scope, format!("Expected Uint32Array at position {}", #idx));
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|
}
|
|
}
|
|
}
|
|
|
|
fn codegen_sync_ret(
|
|
core: &TokenStream2,
|
|
output: &syn::ReturnType,
|
|
) -> TokenStream2 {
|
|
if is_void(output) {
|
|
return quote! {};
|
|
}
|
|
|
|
if is_u32_rv(output) {
|
|
return quote! {
|
|
rv.set_uint32(result as u32);
|
|
};
|
|
}
|
|
|
|
// Optimize Result<(), Err> to skip serde_v8 when Ok(...)
|
|
let ok_block = if is_unit_result(output) {
|
|
quote! {}
|
|
} else if is_u32_rv_result(output) {
|
|
quote! {
|
|
rv.set_uint32(result as u32);
|
|
}
|
|
} else {
|
|
quote! {
|
|
match #core::serde_v8::to_v8(scope, result) {
|
|
Ok(ret) => rv.set(ret),
|
|
Err(err) => #core::_ops::throw_type_error(
|
|
scope,
|
|
format!("Error serializing return: {}", #core::anyhow::Error::from(err)),
|
|
),
|
|
};
|
|
}
|
|
};
|
|
|
|
if !is_result(output) {
|
|
return ok_block;
|
|
}
|
|
|
|
quote! {
|
|
match result {
|
|
Ok(result) => {
|
|
#ok_block
|
|
},
|
|
Err(err) => {
|
|
let exception = #core::error::to_v8_error(scope, op_state.get_error_class_fn, &err);
|
|
scope.throw_exception(exception);
|
|
},
|
|
};
|
|
}
|
|
}
|
|
|
|
fn is_void(ty: impl ToTokens) -> bool {
|
|
tokens(ty).is_empty()
|
|
}
|
|
|
|
fn is_result(ty: impl ToTokens) -> bool {
|
|
let tokens = tokens(ty);
|
|
if tokens.trim_start_matches("-> ").starts_with("Result <") {
|
|
return true;
|
|
}
|
|
// Detect `io::Result<...>`, `anyhow::Result<...>`, etc...
|
|
// i.e: Result aliases/shorthands which are unfortunately "opaque" at macro-time
|
|
match tokens.find(":: Result <") {
|
|
Some(idx) => !tokens.split_at(idx).0.contains('<'),
|
|
None => false,
|
|
}
|
|
}
|
|
|
|
fn is_string(ty: impl ToTokens) -> bool {
|
|
tokens(ty) == "String"
|
|
}
|
|
|
|
fn is_option_string(ty: impl ToTokens) -> bool {
|
|
tokens(ty) == "Option < String >"
|
|
}
|
|
|
|
enum SliceType {
|
|
U8,
|
|
U8Mut,
|
|
U32Mut,
|
|
}
|
|
|
|
fn is_ref_slice(ty: impl ToTokens) -> Option<SliceType> {
|
|
if is_u8_slice(&ty) {
|
|
return Some(SliceType::U8);
|
|
}
|
|
if is_u8_slice_mut(&ty) {
|
|
return Some(SliceType::U8Mut);
|
|
}
|
|
if is_u32_slice_mut(&ty) {
|
|
return Some(SliceType::U32Mut);
|
|
}
|
|
None
|
|
}
|
|
|
|
fn is_u8_slice(ty: impl ToTokens) -> bool {
|
|
tokens(ty) == "& [u8]"
|
|
}
|
|
|
|
fn is_u8_slice_mut(ty: impl ToTokens) -> bool {
|
|
tokens(ty) == "& mut [u8]"
|
|
}
|
|
|
|
fn is_u32_slice_mut(ty: impl ToTokens) -> bool {
|
|
tokens(ty) == "& mut [u32]"
|
|
}
|
|
|
|
fn is_optional_fast_callback_option(ty: impl ToTokens) -> bool {
|
|
tokens(&ty).contains("Option < & mut FastApiCallbackOptions")
|
|
}
|
|
|
|
/// Detects if the type can be set using `rv.set_uint32` fast path
|
|
fn is_u32_rv(ty: impl ToTokens) -> bool {
|
|
["u32", "u8", "u16"].iter().any(|&s| tokens(&ty) == s) || is_resource_id(&ty)
|
|
}
|
|
|
|
/// Detects if the type is of the format Result<u32/u8/u16, Err>
|
|
fn is_u32_rv_result(ty: impl ToTokens) -> bool {
|
|
is_result(&ty)
|
|
&& (tokens(&ty).contains("Result < u32")
|
|
|| tokens(&ty).contains("Result < u8")
|
|
|| tokens(&ty).contains("Result < u16")
|
|
|| is_resource_id(&ty))
|
|
}
|
|
|
|
/// Detects if a type is of the form Result<(), Err>
|
|
fn is_unit_result(ty: impl ToTokens) -> bool {
|
|
is_result(&ty) && tokens(&ty).contains("Result < ()")
|
|
}
|
|
|
|
fn is_resource_id(arg: impl ToTokens) -> bool {
|
|
static RE: Lazy<Regex> =
|
|
Lazy::new(|| Regex::new(r#": (?:deno_core :: )?ResourceId$"#).unwrap());
|
|
RE.is_match(&tokens(arg))
|
|
}
|
|
|
|
fn is_mut_ref_opstate(arg: impl ToTokens) -> bool {
|
|
static RE: Lazy<Regex> =
|
|
Lazy::new(|| Regex::new(r#": & mut (?:deno_core :: )?OpState$"#).unwrap());
|
|
RE.is_match(&tokens(arg))
|
|
}
|
|
|
|
fn is_rc_refcell_opstate(arg: &syn::FnArg) -> bool {
|
|
static RE: Lazy<Regex> = Lazy::new(|| {
|
|
Regex::new(r#": Rc < RefCell < (?:deno_core :: )?OpState > >$"#).unwrap()
|
|
});
|
|
RE.is_match(&tokens(arg))
|
|
}
|
|
|
|
fn is_handle_scope(arg: &syn::FnArg) -> bool {
|
|
static RE: Lazy<Regex> = Lazy::new(|| {
|
|
Regex::new(r#": & mut (?:deno_core :: )?v8 :: HandleScope(?: < '\w+ >)?$"#)
|
|
.unwrap()
|
|
});
|
|
RE.is_match(&tokens(arg))
|
|
}
|
|
|
|
fn is_future(ty: impl ToTokens) -> bool {
|
|
tokens(&ty).contains("impl Future < Output =")
|
|
}
|
|
|
|
fn tokens(x: impl ToTokens) -> String {
|
|
x.to_token_stream().to_string()
|
|
}
|
|
|
|
fn exclude_lifetime_params(
|
|
generic_params: &Punctuated<GenericParam, Comma>,
|
|
) -> Punctuated<GenericParam, Comma> {
|
|
generic_params
|
|
.iter()
|
|
.filter(|t| !tokens(t).starts_with('\''))
|
|
.cloned()
|
|
.collect::<Punctuated<GenericParam, Comma>>()
|
|
}
|