mirror of
https://github.com/denoland/deno
synced 2024-08-25 02:57:22 +00:00
655 lines
20 KiB
Rust
655 lines
20 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use crate::check_unstable;
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use crate::symbol::NativeType;
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use crate::FfiPermissions;
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use crate::ForeignFunction;
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use crate::MAX_SAFE_INTEGER;
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use crate::MIN_SAFE_INTEGER;
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use deno_core::error::AnyError;
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use deno_core::op2;
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use deno_core::v8;
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use deno_core::v8::TryCatch;
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use deno_core::CancelFuture;
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use deno_core::CancelHandle;
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use deno_core::OpState;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use deno_core::V8CrossThreadTaskSpawner;
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use libffi::middle::Cif;
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use serde::Deserialize;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::ffi::c_void;
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use std::future::Future;
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use std::future::IntoFuture;
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use std::pin::Pin;
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use std::ptr;
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use std::ptr::NonNull;
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use std::rc::Rc;
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use std::sync::atomic;
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use std::sync::atomic::AtomicU32;
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use std::task::Poll;
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static THREAD_ID_COUNTER: AtomicU32 = AtomicU32::new(1);
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thread_local! {
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static LOCAL_THREAD_ID: RefCell<u32> = RefCell::new(0);
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}
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#[derive(Clone)]
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pub struct PtrSymbol {
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pub cif: libffi::middle::Cif,
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pub ptr: libffi::middle::CodePtr,
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}
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impl PtrSymbol {
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pub fn new(
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fn_ptr: *mut c_void,
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def: &ForeignFunction,
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) -> Result<Self, AnyError> {
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let ptr = libffi::middle::CodePtr::from_ptr(fn_ptr as _);
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let cif = libffi::middle::Cif::new(
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def
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.parameters
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.clone()
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.into_iter()
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.map(libffi::middle::Type::try_from)
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.collect::<Result<Vec<_>, _>>()?,
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def.result.clone().try_into()?,
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);
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Ok(Self { cif, ptr })
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}
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}
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#[allow(clippy::non_send_fields_in_send_ty)]
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// SAFETY: unsafe trait must have unsafe implementation
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unsafe impl Send for PtrSymbol {}
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// SAFETY: unsafe trait must have unsafe implementation
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unsafe impl Sync for PtrSymbol {}
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struct UnsafeCallbackResource {
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cancel: Rc<CancelHandle>,
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// Closure is never directly touched, but it keeps the C callback alive
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// until `close()` method is called.
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#[allow(dead_code)]
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closure: libffi::middle::Closure<'static>,
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info: *mut CallbackInfo,
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}
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impl Resource for UnsafeCallbackResource {
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fn name(&self) -> Cow<str> {
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"unsafecallback".into()
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}
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fn close(self: Rc<Self>) {
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self.cancel.cancel();
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}
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}
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struct CallbackInfo {
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pub async_work_sender: V8CrossThreadTaskSpawner,
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pub callback: NonNull<v8::Function>,
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pub context: NonNull<v8::Context>,
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pub parameters: Box<[NativeType]>,
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pub result: NativeType,
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pub thread_id: u32,
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}
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impl Future for CallbackInfo {
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type Output = ();
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fn poll(
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self: Pin<&mut Self>,
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_cx: &mut std::task::Context<'_>,
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) -> std::task::Poll<Self::Output> {
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// The future for the CallbackInfo never resolves: It can only be canceled.
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Poll::Pending
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}
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}
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struct TaskArgs {
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cif: NonNull<libffi::low::ffi_cif>,
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result: NonNull<c_void>,
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args: *const *const c_void,
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info: NonNull<CallbackInfo>,
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}
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// SAFETY: we know these are valid Send-safe pointers as they are for FFI
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unsafe impl Send for TaskArgs {}
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impl TaskArgs {
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fn run(&mut self, scope: &mut v8::HandleScope) {
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// SAFETY: making a call using Send-safe pointers turned back into references. We know the
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// lifetime of these will last because we block on the result of the spawn call.
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unsafe {
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do_ffi_callback(
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scope,
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self.cif.as_ref(),
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self.info.as_ref(),
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self.result.as_mut(),
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self.args,
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)
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}
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}
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}
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unsafe extern "C" fn deno_ffi_callback(
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cif: &libffi::low::ffi_cif,
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result: &mut c_void,
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args: *const *const c_void,
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info: &CallbackInfo,
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) {
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LOCAL_THREAD_ID.with(|s| {
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if *s.borrow() == info.thread_id {
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// Call from main thread. If this callback is being triggered due to a
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// function call coming from Deno itself, then this callback will build
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// ontop of that stack.
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// If this callback is being triggered outside of Deno (for example from a
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// signal handler) then this will either create an empty new stack if
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// Deno currently has nothing running and is waiting for promises to resolve,
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// or will (very incorrectly) build ontop of whatever stack exists.
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// The callback will even be called through from a `while (true)` liveloop, but
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// it somehow cannot change the values that the loop sees, even if they both
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// refer the same `let bool_value`.
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let context: NonNull<v8::Context> = info.context;
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let context = std::mem::transmute::<
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NonNull<v8::Context>,
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v8::Local<v8::Context>,
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>(context);
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let mut cb_scope = v8::CallbackScope::new(context);
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let scope = &mut v8::HandleScope::new(&mut cb_scope);
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do_ffi_callback(scope, cif, info, result, args);
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} else {
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let async_work_sender = &info.async_work_sender;
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let mut args = TaskArgs {
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cif: NonNull::from(cif),
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result: NonNull::from(result),
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args,
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info: NonNull::from(info),
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};
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async_work_sender.spawn_blocking(move |scope| {
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// We don't have a lot of choice here, so just print an unhandled exception message
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let tc_scope = &mut TryCatch::new(scope);
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args.run(tc_scope);
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if tc_scope.exception().is_some() {
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eprintln!("Illegal unhandled exception in nonblocking callback.");
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}
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});
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}
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});
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}
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unsafe fn do_ffi_callback(
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scope: &mut v8::HandleScope,
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cif: &libffi::low::ffi_cif,
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info: &CallbackInfo,
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result: &mut c_void,
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args: *const *const c_void,
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) {
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let callback: NonNull<v8::Function> = info.callback;
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let func = std::mem::transmute::<
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NonNull<v8::Function>,
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v8::Local<v8::Function>,
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>(callback);
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let result = result as *mut c_void;
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let vals: &[*const c_void] =
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std::slice::from_raw_parts(args, info.parameters.len());
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let arg_types = std::slice::from_raw_parts(cif.arg_types, cif.nargs as usize);
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let mut params: Vec<v8::Local<v8::Value>> = vec![];
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for ((index, native_type), val) in
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info.parameters.iter().enumerate().zip(vals)
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{
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let value: v8::Local<v8::Value> = match native_type {
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NativeType::Bool => {
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let value = *((*val) as *const bool);
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v8::Boolean::new(scope, value).into()
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}
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NativeType::F32 => {
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let value = *((*val) as *const f32);
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v8::Number::new(scope, value as f64).into()
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}
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NativeType::F64 => {
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let value = *((*val) as *const f64);
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v8::Number::new(scope, value).into()
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}
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NativeType::I8 => {
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let value = *((*val) as *const i8);
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v8::Integer::new(scope, value as i32).into()
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}
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NativeType::U8 => {
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let value = *((*val) as *const u8);
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v8::Integer::new_from_unsigned(scope, value as u32).into()
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}
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NativeType::I16 => {
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let value = *((*val) as *const i16);
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v8::Integer::new(scope, value as i32).into()
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}
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NativeType::U16 => {
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let value = *((*val) as *const u16);
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v8::Integer::new_from_unsigned(scope, value as u32).into()
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}
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NativeType::I32 => {
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let value = *((*val) as *const i32);
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v8::Integer::new(scope, value).into()
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}
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NativeType::U32 => {
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let value = *((*val) as *const u32);
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v8::Integer::new_from_unsigned(scope, value).into()
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}
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NativeType::I64 | NativeType::ISize => {
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let result = *((*val) as *const i64);
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if result > MAX_SAFE_INTEGER as i64 || result < MIN_SAFE_INTEGER as i64
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{
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v8::BigInt::new_from_i64(scope, result).into()
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} else {
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v8::Number::new(scope, result as f64).into()
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}
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}
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NativeType::U64 | NativeType::USize => {
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let result = *((*val) as *const u64);
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if result > MAX_SAFE_INTEGER as u64 {
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v8::BigInt::new_from_u64(scope, result).into()
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} else {
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v8::Number::new(scope, result as f64).into()
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}
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}
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NativeType::Pointer | NativeType::Buffer | NativeType::Function => {
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let result = *((*val) as *const *mut c_void);
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if result.is_null() {
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v8::null(scope).into()
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} else {
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v8::External::new(scope, result).into()
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}
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}
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NativeType::Struct(_) => {
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let size = arg_types[index].as_ref().unwrap().size;
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let ptr = (*val) as *const u8;
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let slice = std::slice::from_raw_parts(ptr, size);
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let boxed = Box::from(slice);
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let store = v8::ArrayBuffer::new_backing_store_from_boxed_slice(boxed);
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let ab =
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v8::ArrayBuffer::with_backing_store(scope, &store.make_shared());
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let local_value: v8::Local<v8::Value> =
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v8::Uint8Array::new(scope, ab, 0, ab.byte_length())
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.unwrap()
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.into();
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local_value
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}
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NativeType::Void => unreachable!(),
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};
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params.push(value);
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}
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let recv = v8::undefined(scope);
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let call_result = func.call(scope, recv.into(), ¶ms);
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if call_result.is_none() {
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// JS function threw an exception. Set the return value to zero and return.
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// The exception continue propagating up the call chain when the event loop
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// resumes.
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match info.result {
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NativeType::Bool => {
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*(result as *mut bool) = false;
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}
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NativeType::U32 | NativeType::I32 => {
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// zero is equal for signed and unsigned alike
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*(result as *mut u32) = 0;
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}
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NativeType::F32 => {
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*(result as *mut f32) = 0.0;
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}
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NativeType::F64 => {
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*(result as *mut f64) = 0.0;
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}
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NativeType::U8 | NativeType::I8 => {
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// zero is equal for signed and unsigned alike
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*(result as *mut u8) = 0;
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}
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NativeType::U16 | NativeType::I16 => {
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// zero is equal for signed and unsigned alike
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*(result as *mut u16) = 0;
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}
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NativeType::Pointer
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| NativeType::Buffer
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| NativeType::Function
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| NativeType::U64
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| NativeType::I64 => {
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*(result as *mut usize) = 0;
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}
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NativeType::Void => {
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// nop
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}
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_ => {
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unreachable!();
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}
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};
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return;
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}
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let value = call_result.unwrap();
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match info.result {
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NativeType::Bool => {
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let value = if let Ok(value) = v8::Local::<v8::Boolean>::try_from(value) {
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value.is_true()
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} else {
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value.boolean_value(scope)
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};
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*(result as *mut bool) = value;
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}
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NativeType::F32 => {
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let value = if let Ok(value) = v8::Local::<v8::Number>::try_from(value) {
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value.value() as f32
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} else {
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// Fallthrough, probably UB.
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value
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.number_value(scope)
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.expect("Unable to deserialize result parameter.") as f32
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};
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*(result as *mut f32) = value;
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}
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NativeType::F64 => {
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let value = if let Ok(value) = v8::Local::<v8::Number>::try_from(value) {
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value.value()
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} else {
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// Fallthrough, probably UB.
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value
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.number_value(scope)
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.expect("Unable to deserialize result parameter.")
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};
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*(result as *mut f64) = value;
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}
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NativeType::Buffer => {
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let pointer: *mut u8 = if let Ok(value) =
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v8::Local::<v8::ArrayBufferView>::try_from(value)
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{
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let byte_offset = value.byte_offset();
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let pointer = value
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.buffer(scope)
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.expect("Unable to deserialize result parameter.")
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.data();
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if let Some(non_null) = pointer {
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// SAFETY: Pointer is non-null, and V8 guarantees that the byte_offset
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// is within the buffer backing store.
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unsafe { non_null.as_ptr().add(byte_offset) as *mut u8 }
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} else {
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ptr::null_mut()
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}
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} else if let Ok(value) = v8::Local::<v8::ArrayBuffer>::try_from(value) {
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let pointer = value.data();
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if let Some(non_null) = pointer {
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non_null.as_ptr() as *mut u8
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} else {
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ptr::null_mut()
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}
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} else {
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ptr::null_mut()
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};
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*(result as *mut *mut u8) = pointer;
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}
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NativeType::Pointer | NativeType::Function => {
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let pointer: *mut c_void =
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if let Ok(external) = v8::Local::<v8::External>::try_from(value) {
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external.value()
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} else {
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// TODO(@aapoalas): Start throwing errors into JS about invalid callback return values.
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ptr::null_mut()
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};
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*(result as *mut *mut c_void) = pointer;
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}
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NativeType::I8 => {
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let value = if let Ok(value) = v8::Local::<v8::Int32>::try_from(value) {
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value.value() as i8
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} else {
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// Fallthrough, essentially UB.
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value
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.int32_value(scope)
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.expect("Unable to deserialize result parameter.") as i8
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};
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*(result as *mut i8) = value;
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}
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NativeType::U8 => {
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let value = if let Ok(value) = v8::Local::<v8::Uint32>::try_from(value) {
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value.value() as u8
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} else {
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// Fallthrough, essentially UB.
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value
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.uint32_value(scope)
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.expect("Unable to deserialize result parameter.") as u8
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};
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*(result as *mut u8) = value;
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}
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NativeType::I16 => {
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let value = if let Ok(value) = v8::Local::<v8::Int32>::try_from(value) {
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value.value() as i16
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} else {
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// Fallthrough, essentially UB.
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value
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.int32_value(scope)
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.expect("Unable to deserialize result parameter.") as i16
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};
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*(result as *mut i16) = value;
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}
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NativeType::U16 => {
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let value = if let Ok(value) = v8::Local::<v8::Uint32>::try_from(value) {
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value.value() as u16
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} else {
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// Fallthrough, essentially UB.
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value
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.uint32_value(scope)
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.expect("Unable to deserialize result parameter.") as u16
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};
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*(result as *mut u16) = value;
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}
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NativeType::I32 => {
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let value = if let Ok(value) = v8::Local::<v8::Int32>::try_from(value) {
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value.value()
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} else {
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// Fallthrough, essentially UB.
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value
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.int32_value(scope)
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.expect("Unable to deserialize result parameter.")
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};
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*(result as *mut i32) = value;
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}
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NativeType::U32 => {
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let value = if let Ok(value) = v8::Local::<v8::Uint32>::try_from(value) {
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value.value()
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} else {
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// Fallthrough, essentially UB.
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value
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.uint32_value(scope)
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.expect("Unable to deserialize result parameter.")
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};
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*(result as *mut u32) = value;
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}
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NativeType::I64 | NativeType::ISize => {
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if let Ok(value) = v8::Local::<v8::BigInt>::try_from(value) {
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*(result as *mut i64) = value.i64_value().0;
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} else if let Ok(value) = v8::Local::<v8::Int32>::try_from(value) {
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*(result as *mut i64) = value.value() as i64;
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} else if let Ok(value) = v8::Local::<v8::Number>::try_from(value) {
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*(result as *mut i64) = value.value() as i64;
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} else {
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*(result as *mut i64) = value
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.integer_value(scope)
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.expect("Unable to deserialize result parameter.");
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}
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}
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NativeType::U64 | NativeType::USize => {
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if let Ok(value) = v8::Local::<v8::BigInt>::try_from(value) {
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*(result as *mut u64) = value.u64_value().0;
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} else if let Ok(value) = v8::Local::<v8::Uint32>::try_from(value) {
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*(result as *mut u64) = value.value() as u64;
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} else if let Ok(value) = v8::Local::<v8::Number>::try_from(value) {
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*(result as *mut u64) = value.value() as u64;
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} else {
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*(result as *mut u64) = value
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|
.integer_value(scope)
|
|
.expect("Unable to deserialize result parameter.")
|
|
as u64;
|
|
}
|
|
}
|
|
NativeType::Struct(_) => {
|
|
let size;
|
|
let pointer = if let Ok(value) =
|
|
v8::Local::<v8::ArrayBufferView>::try_from(value)
|
|
{
|
|
let byte_offset = value.byte_offset();
|
|
let ab = value
|
|
.buffer(scope)
|
|
.expect("Unable to deserialize result parameter.");
|
|
size = value.byte_length();
|
|
ab.data()
|
|
.expect("Unable to deserialize result parameter.")
|
|
.as_ptr()
|
|
.add(byte_offset)
|
|
} else if let Ok(value) = v8::Local::<v8::ArrayBuffer>::try_from(value) {
|
|
size = value.byte_length();
|
|
value
|
|
.data()
|
|
.expect("Unable to deserialize result parameter.")
|
|
.as_ptr()
|
|
} else {
|
|
panic!("Unable to deserialize result parameter.");
|
|
};
|
|
std::ptr::copy_nonoverlapping(
|
|
pointer as *mut u8,
|
|
result as *mut u8,
|
|
std::cmp::min(size, (*cif.rtype).size),
|
|
);
|
|
}
|
|
NativeType::Void => {
|
|
// nop
|
|
}
|
|
};
|
|
}
|
|
|
|
#[op2(async)]
|
|
pub fn op_ffi_unsafe_callback_ref(
|
|
state: Rc<RefCell<OpState>>,
|
|
#[smi] rid: ResourceId,
|
|
) -> Result<impl Future<Output = Result<(), AnyError>>, AnyError> {
|
|
let state = state.borrow();
|
|
let callback_resource =
|
|
state.resource_table.get::<UnsafeCallbackResource>(rid)?;
|
|
|
|
Ok(async move {
|
|
let info: &mut CallbackInfo =
|
|
// SAFETY: CallbackInfo pointer stays valid as long as the resource is still alive.
|
|
unsafe { callback_resource.info.as_mut().unwrap() };
|
|
// Ignore cancellation rejection
|
|
let _ = info
|
|
.into_future()
|
|
.or_cancel(callback_resource.cancel.clone())
|
|
.await;
|
|
Ok(())
|
|
})
|
|
}
|
|
|
|
#[derive(Deserialize)]
|
|
pub struct RegisterCallbackArgs {
|
|
parameters: Vec<NativeType>,
|
|
result: NativeType,
|
|
}
|
|
|
|
#[op2]
|
|
pub fn op_ffi_unsafe_callback_create<FP, 'scope>(
|
|
state: &mut OpState,
|
|
scope: &mut v8::HandleScope<'scope>,
|
|
#[serde] args: RegisterCallbackArgs,
|
|
cb: v8::Local<v8::Function>,
|
|
) -> Result<v8::Local<'scope, v8::Value>, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
check_unstable(state, "Deno.UnsafeCallback");
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check_partial(None)?;
|
|
|
|
let thread_id: u32 = LOCAL_THREAD_ID.with(|s| {
|
|
let value = *s.borrow();
|
|
if value == 0 {
|
|
let res = THREAD_ID_COUNTER.fetch_add(1, atomic::Ordering::SeqCst);
|
|
s.replace(res);
|
|
res
|
|
} else {
|
|
value
|
|
}
|
|
});
|
|
|
|
if thread_id == 0 {
|
|
panic!("Isolate ID counter overflowed u32");
|
|
}
|
|
|
|
let async_work_sender = state.borrow::<V8CrossThreadTaskSpawner>().clone();
|
|
|
|
let callback = v8::Global::new(scope, cb).into_raw();
|
|
let current_context = scope.get_current_context();
|
|
let context = v8::Global::new(scope, current_context).into_raw();
|
|
|
|
let info: *mut CallbackInfo = Box::leak(Box::new(CallbackInfo {
|
|
async_work_sender,
|
|
callback,
|
|
context,
|
|
parameters: args.parameters.clone().into(),
|
|
result: args.result.clone(),
|
|
thread_id,
|
|
}));
|
|
let cif = Cif::new(
|
|
args
|
|
.parameters
|
|
.into_iter()
|
|
.map(libffi::middle::Type::try_from)
|
|
.collect::<Result<Vec<_>, _>>()?,
|
|
libffi::middle::Type::try_from(args.result)?,
|
|
);
|
|
|
|
// SAFETY: CallbackInfo is leaked, is not null and stays valid as long as the callback exists.
|
|
let closure = libffi::middle::Closure::new(cif, deno_ffi_callback, unsafe {
|
|
info.as_ref().unwrap()
|
|
});
|
|
let ptr = *closure.code_ptr() as *mut c_void;
|
|
let resource = UnsafeCallbackResource {
|
|
cancel: CancelHandle::new_rc(),
|
|
closure,
|
|
info,
|
|
};
|
|
let rid = state.resource_table.add(resource);
|
|
|
|
let rid_local = v8::Integer::new_from_unsigned(scope, rid);
|
|
let ptr_local: v8::Local<v8::Value> = v8::External::new(scope, ptr).into();
|
|
let array = v8::Array::new(scope, 2);
|
|
array.set_index(scope, 0, rid_local.into());
|
|
array.set_index(scope, 1, ptr_local);
|
|
let array_value: v8::Local<v8::Value> = array.into();
|
|
|
|
Ok(array_value)
|
|
}
|
|
|
|
#[op2]
|
|
pub fn op_ffi_unsafe_callback_close(
|
|
state: &mut OpState,
|
|
scope: &mut v8::HandleScope,
|
|
#[smi] rid: ResourceId,
|
|
) -> Result<(), AnyError> {
|
|
// SAFETY: This drops the closure and the callback info associated with it.
|
|
// Any retained function pointers to the closure become dangling pointers.
|
|
// It is up to the user to know that it is safe to call the `close()` on the
|
|
// UnsafeCallback instance.
|
|
unsafe {
|
|
let callback_resource =
|
|
state.resource_table.take::<UnsafeCallbackResource>(rid)?;
|
|
let info = Box::from_raw(callback_resource.info);
|
|
let _ = v8::Global::from_raw(scope, info.callback);
|
|
let _ = v8::Global::from_raw(scope, info.context);
|
|
callback_resource.close();
|
|
}
|
|
Ok(())
|
|
}
|