mirror of
https://github.com/denoland/deno.git
synced 2024-12-01 16:51:13 -05:00
e05cc74750
A few easy migrations of module code from the runtime to the module map. The module map already has a few places where it needs a handle scope, so we're not coupling it any further with the v8 runtime. `init_runtime_module_map` is replaced with an option to reduce API surface of JsRuntime. `module_resolve_callback` now lives in the `ModuleMap` and we use a annex data to avoid having to go through the `Rc<RefCell<...>>` stored in the `JsRuntime`'s isolate.
2313 lines
76 KiB
Rust
2313 lines
76 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use super::bindings;
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use super::jsrealm::JsRealmInner;
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use super::snapshot_util;
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use crate::error::exception_to_err_result;
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use crate::error::generic_error;
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use crate::error::to_v8_type_error;
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use crate::error::GetErrorClassFn;
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use crate::error::JsError;
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use crate::extensions::OpDecl;
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use crate::extensions::OpEventLoopFn;
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use crate::inspector::JsRuntimeInspector;
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use crate::module_specifier::ModuleSpecifier;
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use crate::modules::AssertedModuleType;
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use crate::modules::ExtModuleLoader;
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use crate::modules::ExtModuleLoaderCb;
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use crate::modules::ModuleCode;
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use crate::modules::ModuleError;
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use crate::modules::ModuleId;
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use crate::modules::ModuleLoadId;
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use crate::modules::ModuleLoader;
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use crate::modules::ModuleMap;
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use crate::ops::*;
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use crate::runtime::ContextState;
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use crate::runtime::JsRealm;
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use crate::source_map::SourceMapCache;
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use crate::source_map::SourceMapGetter;
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use crate::Extension;
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use crate::NoopModuleLoader;
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use crate::OpMiddlewareFn;
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use crate::OpResult;
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use crate::OpState;
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use crate::V8_WRAPPER_OBJECT_INDEX;
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use crate::V8_WRAPPER_TYPE_INDEX;
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use anyhow::Context as AnyhowContext;
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use anyhow::Error;
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use futures::channel::oneshot;
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use futures::future::poll_fn;
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use futures::future::Future;
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use futures::stream::StreamExt;
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use smallvec::SmallVec;
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use std::any::Any;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::ffi::c_void;
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use std::mem::ManuallyDrop;
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use std::ops::Deref;
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use std::ops::DerefMut;
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use std::option::Option;
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use std::rc::Rc;
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use std::sync::atomic::AtomicBool;
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use std::sync::atomic::Ordering;
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use std::sync::Arc;
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use std::sync::Mutex;
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use std::sync::Once;
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use std::task::Context;
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use std::task::Poll;
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const STATE_DATA_OFFSET: u32 = 0;
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const MODULE_MAP_DATA_OFFSET: u32 = 1;
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pub enum Snapshot {
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Static(&'static [u8]),
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JustCreated(v8::StartupData),
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Boxed(Box<[u8]>),
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}
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/// Objects that need to live as long as the isolate
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#[derive(Default)]
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pub(crate) struct IsolateAllocations {
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pub(crate) near_heap_limit_callback_data:
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Option<(Box<RefCell<dyn Any>>, v8::NearHeapLimitCallback)>,
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}
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/// ManuallyDrop<Rc<...>> is clone, but it returns a ManuallyDrop<Rc<...>> which is a massive
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/// memory-leak footgun.
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pub(crate) struct ManuallyDropRc<T>(ManuallyDrop<Rc<T>>);
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impl<T> ManuallyDropRc<T> {
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pub fn clone(&self) -> Rc<T> {
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self.0.deref().clone()
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}
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}
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impl<T> Deref for ManuallyDropRc<T> {
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type Target = Rc<T>;
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fn deref(&self) -> &Self::Target {
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self.0.deref()
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}
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}
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impl<T> DerefMut for ManuallyDropRc<T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.0.deref_mut()
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}
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}
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/// This struct contains the [`JsRuntimeState`] and [`v8::OwnedIsolate`] that are required
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/// to do an orderly shutdown of V8. We keep these in a separate struct to allow us to control
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/// the destruction more closely, as snapshots require the isolate to be destroyed by the
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/// snapshot process, not the destructor.
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///
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/// The way rusty_v8 works w/snapshots is that the [`v8::OwnedIsolate`] gets consumed by a
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/// [`v8::snapshot::SnapshotCreator`] that is stored in its annex. It's a bit awkward, because this
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/// means we cannot let it drop (because we don't have it after a snapshot). On top of that, we have
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/// to consume it in the snapshot creator because otherwise it panics.
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///
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/// This inner struct allows us to let the outer JsRuntime drop normally without a Drop impl, while we
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/// control dropping more closely here using ManuallyDrop.
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pub(crate) struct InnerIsolateState {
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will_snapshot: bool,
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pub(crate) state: ManuallyDropRc<RefCell<JsRuntimeState>>,
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v8_isolate: ManuallyDrop<v8::OwnedIsolate>,
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}
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impl InnerIsolateState {
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/// Clean out the opstate and take the inspector to prevent the inspector from getting destroyed
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/// after we've torn down the contexts. If the inspector is not correctly torn down, random crashes
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/// happen in tests (and possibly for users using the inspector).
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pub fn prepare_for_cleanup(&mut self) {
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let mut state = self.state.borrow_mut();
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let inspector = state.inspector.take();
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state.op_state.borrow_mut().clear();
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if let Some(inspector) = inspector {
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assert_eq!(
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Rc::strong_count(&inspector),
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1,
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"The inspector must be dropped before the runtime"
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);
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}
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}
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pub fn cleanup(&mut self) {
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self.prepare_for_cleanup();
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let state_ptr = self.v8_isolate.get_data(STATE_DATA_OFFSET);
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// SAFETY: We are sure that it's a valid pointer for whole lifetime of
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// the runtime.
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_ = unsafe { Rc::from_raw(state_ptr as *const RefCell<JsRuntimeState>) };
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let module_map_ptr = self.v8_isolate.get_data(MODULE_MAP_DATA_OFFSET);
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// SAFETY: We are sure that it's a valid pointer for whole lifetime of
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// the runtime.
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_ = unsafe { Rc::from_raw(module_map_ptr as *const RefCell<ModuleMap>) };
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self.state.borrow_mut().destroy_all_realms();
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debug_assert_eq!(Rc::strong_count(&self.state), 1);
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}
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pub fn prepare_for_snapshot(mut self) -> v8::OwnedIsolate {
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self.cleanup();
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// SAFETY: We're copying out of self and then immediately forgetting self
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let (state, isolate) = unsafe {
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(
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ManuallyDrop::take(&mut self.state.0),
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ManuallyDrop::take(&mut self.v8_isolate),
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)
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};
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std::mem::forget(self);
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drop(state);
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isolate
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}
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}
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impl Drop for InnerIsolateState {
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fn drop(&mut self) {
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self.cleanup();
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// SAFETY: We gotta drop these
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unsafe {
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ManuallyDrop::drop(&mut self.state.0);
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if self.will_snapshot {
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// Create the snapshot and just drop it.
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eprintln!("WARNING: v8::OwnedIsolate for snapshot was leaked");
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} else {
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ManuallyDrop::drop(&mut self.v8_isolate);
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}
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}
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}
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}
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub(crate) enum InitMode {
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/// We have no snapshot -- this is a pristine context.
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New,
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/// We are using a snapshot, thus certain initialization steps are skipped.
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FromSnapshot,
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}
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impl InitMode {
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fn from_options(options: &RuntimeOptions) -> Self {
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match options.startup_snapshot {
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None => Self::New,
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Some(_) => Self::FromSnapshot,
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}
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}
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}
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/// A single execution context of JavaScript. Corresponds roughly to the "Web
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/// Worker" concept in the DOM.
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////
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/// The JsRuntime future completes when there is an error or when all
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/// pending ops have completed.
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///
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/// Use [`JsRuntimeForSnapshot`] to be able to create a snapshot.
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pub struct JsRuntime {
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pub(crate) inner: InnerIsolateState,
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pub(crate) module_map: Rc<RefCell<ModuleMap>>,
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pub(crate) allocations: IsolateAllocations,
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extensions: Vec<Extension>,
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event_loop_middlewares: Vec<Box<OpEventLoopFn>>,
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init_mode: InitMode,
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// Marks if this is considered the top-level runtime. Used only be inspector.
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is_main: bool,
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}
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/// The runtime type used for snapshot creation.
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pub struct JsRuntimeForSnapshot(JsRuntime);
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impl Deref for JsRuntimeForSnapshot {
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type Target = JsRuntime;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for JsRuntimeForSnapshot {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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pub(crate) struct DynImportModEvaluate {
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load_id: ModuleLoadId,
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module_id: ModuleId,
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promise: v8::Global<v8::Promise>,
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module: v8::Global<v8::Module>,
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}
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pub(crate) struct ModEvaluate {
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pub(crate) promise: Option<v8::Global<v8::Promise>>,
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pub(crate) has_evaluated: bool,
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pub(crate) handled_promise_rejections: Vec<v8::Global<v8::Promise>>,
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sender: oneshot::Sender<Result<(), Error>>,
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}
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pub struct CrossIsolateStore<T>(Arc<Mutex<CrossIsolateStoreInner<T>>>);
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struct CrossIsolateStoreInner<T> {
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map: HashMap<u32, T>,
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last_id: u32,
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}
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impl<T> CrossIsolateStore<T> {
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pub(crate) fn insert(&self, value: T) -> u32 {
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let mut store = self.0.lock().unwrap();
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let last_id = store.last_id;
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store.map.insert(last_id, value);
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store.last_id += 1;
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last_id
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}
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pub(crate) fn take(&self, id: u32) -> Option<T> {
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let mut store = self.0.lock().unwrap();
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store.map.remove(&id)
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}
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}
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impl<T> Default for CrossIsolateStore<T> {
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fn default() -> Self {
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CrossIsolateStore(Arc::new(Mutex::new(CrossIsolateStoreInner {
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map: Default::default(),
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last_id: 0,
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})))
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}
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}
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impl<T> Clone for CrossIsolateStore<T> {
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fn clone(&self) -> Self {
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Self(self.0.clone())
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}
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}
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pub type SharedArrayBufferStore =
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CrossIsolateStore<v8::SharedRef<v8::BackingStore>>;
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pub type CompiledWasmModuleStore = CrossIsolateStore<v8::CompiledWasmModule>;
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/// Internal state for JsRuntime which is stored in one of v8::Isolate's
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/// embedder slots.
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pub struct JsRuntimeState {
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global_realm: Option<JsRealm>,
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known_realms: Vec<JsRealmInner>,
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pub(crate) has_tick_scheduled: bool,
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pub(crate) pending_dyn_mod_evaluate: Vec<DynImportModEvaluate>,
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pub(crate) pending_mod_evaluate: Option<ModEvaluate>,
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/// A counter used to delay our dynamic import deadlock detection by one spin
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/// of the event loop.
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dyn_module_evaluate_idle_counter: u32,
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pub(crate) source_map_getter: Option<Rc<Box<dyn SourceMapGetter>>>,
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pub(crate) source_map_cache: Rc<RefCell<SourceMapCache>>,
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pub(crate) op_state: Rc<RefCell<OpState>>,
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pub(crate) shared_array_buffer_store: Option<SharedArrayBufferStore>,
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pub(crate) compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
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/// The error that was passed to an `op_dispatch_exception` call.
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/// It will be retrieved by `exception_to_err_result` and used as an error
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/// instead of any other exceptions.
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// TODO(nayeemrmn): This is polled in `exception_to_err_result()` which is
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// flimsy. Try to poll it similarly to `pending_promise_rejections`.
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pub(crate) dispatched_exception: Option<v8::Global<v8::Value>>,
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pub(crate) inspector: Option<Rc<RefCell<JsRuntimeInspector>>>,
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}
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impl JsRuntimeState {
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pub(crate) fn destroy_all_realms(&mut self) {
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self.global_realm.take();
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for realm in self.known_realms.drain(..) {
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realm.destroy()
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}
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}
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pub(crate) fn remove_realm(
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&mut self,
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realm_context: &Rc<v8::Global<v8::Context>>,
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) {
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self
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.known_realms
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.retain(|realm| !realm.is_same(realm_context));
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}
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}
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fn v8_init(
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v8_platform: Option<v8::SharedRef<v8::Platform>>,
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predictable: bool,
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) {
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// Include 10MB ICU data file.
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#[repr(C, align(16))]
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struct IcuData([u8; 10541264]);
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static ICU_DATA: IcuData = IcuData(*include_bytes!("icudtl.dat"));
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v8::icu::set_common_data_72(&ICU_DATA.0).unwrap();
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let flags = concat!(
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" --wasm-test-streaming",
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" --harmony-import-assertions",
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" --no-validate-asm",
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" --turbo_fast_api_calls",
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" --harmony-change-array-by-copy",
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);
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if predictable {
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v8::V8::set_flags_from_string(&format!(
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"{}{}",
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flags, " --predictable --random-seed=42"
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));
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} else {
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v8::V8::set_flags_from_string(flags);
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}
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let v8_platform = v8_platform
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.unwrap_or_else(|| v8::new_default_platform(0, false).make_shared());
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v8::V8::initialize_platform(v8_platform);
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v8::V8::initialize();
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}
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#[derive(Default)]
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pub struct RuntimeOptions {
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/// Source map reference for errors.
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pub source_map_getter: Option<Box<dyn SourceMapGetter>>,
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/// Allows to map error type to a string "class" used to represent
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/// error in JavaScript.
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pub get_error_class_fn: Option<GetErrorClassFn>,
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/// Implementation of `ModuleLoader` which will be
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/// called when V8 requests to load ES modules.
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///
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/// If not provided runtime will error if code being
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/// executed tries to load modules.
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pub module_loader: Option<Rc<dyn ModuleLoader>>,
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/// JsRuntime extensions, not to be confused with ES modules.
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/// Only ops registered by extensions will be initialized. If you need
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/// to execute JS code from extensions, pass source files in `js` or `esm`
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/// option on `ExtensionBuilder`.
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///
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/// If you are creating a runtime from a snapshot take care not to include
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/// JavaScript sources in the extensions.
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pub extensions: Vec<Extension>,
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/// If provided, the module map will be cleared and left only with the specifiers
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/// in this list, with the new names provided. If not provided, the module map is
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/// left intact.
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pub rename_modules: Option<Vec<(&'static str, &'static str)>>,
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/// V8 snapshot that should be loaded on startup.
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pub startup_snapshot: Option<Snapshot>,
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/// Isolate creation parameters.
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pub create_params: Option<v8::CreateParams>,
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/// V8 platform instance to use. Used when Deno initializes V8
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/// (which it only does once), otherwise it's silenty dropped.
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pub v8_platform: Option<v8::SharedRef<v8::Platform>>,
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/// The store to use for transferring SharedArrayBuffers between isolates.
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/// If multiple isolates should have the possibility of sharing
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/// SharedArrayBuffers, they should use the same [SharedArrayBufferStore]. If
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/// no [SharedArrayBufferStore] is specified, SharedArrayBuffer can not be
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/// serialized.
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pub shared_array_buffer_store: Option<SharedArrayBufferStore>,
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/// The store to use for transferring `WebAssembly.Module` objects between
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/// isolates.
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/// If multiple isolates should have the possibility of sharing
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/// `WebAssembly.Module` objects, they should use the same
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/// [CompiledWasmModuleStore]. If no [CompiledWasmModuleStore] is specified,
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/// `WebAssembly.Module` objects cannot be serialized.
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pub compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
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/// Start inspector instance to allow debuggers to connect.
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pub inspector: bool,
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/// Describe if this is the main runtime instance, used by debuggers in some
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/// situation - like disconnecting when program finishes running.
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pub is_main: bool,
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}
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#[derive(Default)]
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pub struct RuntimeSnapshotOptions {
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/// An optional callback that will be called for each module that is loaded
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/// during snapshotting. This callback can be used to transpile source on the
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/// fly, during snapshotting, eg. to transpile TypeScript to JavaScript.
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pub snapshot_module_load_cb: Option<ExtModuleLoaderCb>,
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}
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impl JsRuntime {
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/// Only constructor, configuration is done through `options`.
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pub fn new(mut options: RuntimeOptions) -> JsRuntime {
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JsRuntime::init_v8(options.v8_platform.take(), cfg!(test));
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JsRuntime::new_inner(options, false, None)
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}
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pub(crate) fn state_from(
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isolate: &v8::Isolate,
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) -> Rc<RefCell<JsRuntimeState>> {
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let state_ptr = isolate.get_data(STATE_DATA_OFFSET);
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let state_rc =
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// SAFETY: We are sure that it's a valid pointer for whole lifetime of
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// the runtime.
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unsafe { Rc::from_raw(state_ptr as *const RefCell<JsRuntimeState>) };
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let state = state_rc.clone();
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std::mem::forget(state_rc);
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state
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}
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pub(crate) fn module_map_from(
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isolate: &v8::Isolate,
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) -> Rc<RefCell<ModuleMap>> {
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let module_map_ptr = isolate.get_data(MODULE_MAP_DATA_OFFSET);
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let module_map_rc =
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// SAFETY: We are sure that it's a valid pointer for whole lifetime of
|
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// the runtime.
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unsafe { Rc::from_raw(module_map_ptr as *const RefCell<ModuleMap>) };
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let module_map = module_map_rc.clone();
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std::mem::forget(module_map_rc);
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module_map
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}
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pub(crate) fn event_loop_pending_state_from_scope(
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scope: &mut v8::HandleScope,
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) -> EventLoopPendingState {
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let state = JsRuntime::state_from(scope);
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let module_map = JsRuntime::module_map_from(scope);
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let state = EventLoopPendingState::new(
|
|
scope,
|
|
&mut state.borrow_mut(),
|
|
&module_map.borrow(),
|
|
);
|
|
state
|
|
}
|
|
|
|
fn init_v8(
|
|
v8_platform: Option<v8::SharedRef<v8::Platform>>,
|
|
predictable: bool,
|
|
) {
|
|
static DENO_INIT: Once = Once::new();
|
|
static DENO_PREDICTABLE: AtomicBool = AtomicBool::new(false);
|
|
static DENO_PREDICTABLE_SET: AtomicBool = AtomicBool::new(false);
|
|
|
|
if DENO_PREDICTABLE_SET.load(Ordering::SeqCst) {
|
|
let current = DENO_PREDICTABLE.load(Ordering::SeqCst);
|
|
assert_eq!(current, predictable, "V8 may only be initialized once in either snapshotting or non-snapshotting mode. Either snapshotting or non-snapshotting mode may be used in a single process, not both.");
|
|
DENO_PREDICTABLE_SET.store(true, Ordering::SeqCst);
|
|
DENO_PREDICTABLE.store(predictable, Ordering::SeqCst);
|
|
}
|
|
|
|
DENO_INIT.call_once(move || v8_init(v8_platform, predictable));
|
|
}
|
|
|
|
fn new_inner(
|
|
mut options: RuntimeOptions,
|
|
will_snapshot: bool,
|
|
maybe_load_callback: Option<ExtModuleLoaderCb>,
|
|
) -> JsRuntime {
|
|
let init_mode = InitMode::from_options(&options);
|
|
let (op_state, ops) = Self::create_opstate(&mut options, init_mode);
|
|
let op_state = Rc::new(RefCell::new(op_state));
|
|
|
|
// Collect event-loop middleware
|
|
let mut event_loop_middlewares =
|
|
Vec::with_capacity(options.extensions.len());
|
|
for extension in &mut options.extensions {
|
|
if let Some(middleware) = extension.init_event_loop_middleware() {
|
|
event_loop_middlewares.push(middleware);
|
|
}
|
|
}
|
|
|
|
let align = std::mem::align_of::<usize>();
|
|
let layout = std::alloc::Layout::from_size_align(
|
|
std::mem::size_of::<*mut v8::OwnedIsolate>(),
|
|
align,
|
|
)
|
|
.unwrap();
|
|
assert!(layout.size() > 0);
|
|
let isolate_ptr: *mut v8::OwnedIsolate =
|
|
// SAFETY: we just asserted that layout has non-0 size.
|
|
unsafe { std::alloc::alloc(layout) as *mut _ };
|
|
|
|
let state_rc = Rc::new(RefCell::new(JsRuntimeState {
|
|
pending_dyn_mod_evaluate: vec![],
|
|
pending_mod_evaluate: None,
|
|
dyn_module_evaluate_idle_counter: 0,
|
|
has_tick_scheduled: false,
|
|
source_map_getter: options.source_map_getter.map(Rc::new),
|
|
source_map_cache: Default::default(),
|
|
shared_array_buffer_store: options.shared_array_buffer_store,
|
|
compiled_wasm_module_store: options.compiled_wasm_module_store,
|
|
op_state: op_state.clone(),
|
|
dispatched_exception: None,
|
|
// Some fields are initialized later after isolate is created
|
|
inspector: None,
|
|
global_realm: None,
|
|
known_realms: Vec::with_capacity(1),
|
|
}));
|
|
|
|
let weak = Rc::downgrade(&state_rc);
|
|
let context_state = Rc::new(RefCell::new(ContextState::default()));
|
|
let op_ctxs = ops
|
|
.into_iter()
|
|
.enumerate()
|
|
.map(|(id, decl)| {
|
|
OpCtx::new(
|
|
id as u16,
|
|
context_state.clone(),
|
|
Rc::new(decl),
|
|
op_state.clone(),
|
|
weak.clone(),
|
|
)
|
|
})
|
|
.collect::<Vec<_>>()
|
|
.into_boxed_slice();
|
|
context_state.borrow_mut().op_ctxs = op_ctxs;
|
|
context_state.borrow_mut().isolate = Some(isolate_ptr);
|
|
|
|
let refs = bindings::external_references(&context_state.borrow().op_ctxs);
|
|
// V8 takes ownership of external_references.
|
|
let refs: &'static v8::ExternalReferences = Box::leak(Box::new(refs));
|
|
|
|
let mut isolate = if will_snapshot {
|
|
snapshot_util::create_snapshot_creator(
|
|
refs,
|
|
options.startup_snapshot.take(),
|
|
)
|
|
} else {
|
|
let mut params = options
|
|
.create_params
|
|
.take()
|
|
.unwrap_or_default()
|
|
.embedder_wrapper_type_info_offsets(
|
|
V8_WRAPPER_TYPE_INDEX,
|
|
V8_WRAPPER_OBJECT_INDEX,
|
|
)
|
|
.external_references(&**refs);
|
|
if let Some(snapshot) = options.startup_snapshot.take() {
|
|
params = match snapshot {
|
|
Snapshot::Static(data) => params.snapshot_blob(data),
|
|
Snapshot::JustCreated(data) => params.snapshot_blob(data),
|
|
Snapshot::Boxed(data) => params.snapshot_blob(data),
|
|
};
|
|
}
|
|
v8::Isolate::new(params)
|
|
};
|
|
isolate.set_capture_stack_trace_for_uncaught_exceptions(true, 10);
|
|
isolate.set_promise_reject_callback(bindings::promise_reject_callback);
|
|
isolate.set_host_initialize_import_meta_object_callback(
|
|
bindings::host_initialize_import_meta_object_callback,
|
|
);
|
|
isolate.set_host_import_module_dynamically_callback(
|
|
bindings::host_import_module_dynamically_callback,
|
|
);
|
|
isolate.set_wasm_async_resolve_promise_callback(
|
|
bindings::wasm_async_resolve_promise_callback,
|
|
);
|
|
|
|
let (global_context, snapshotted_data) = {
|
|
let scope = &mut v8::HandleScope::new(&mut isolate);
|
|
let context = v8::Context::new(scope);
|
|
|
|
// Get module map data from the snapshot
|
|
let snapshotted_data = if init_mode == InitMode::FromSnapshot {
|
|
Some(snapshot_util::get_snapshotted_data(scope, context))
|
|
} else {
|
|
None
|
|
};
|
|
|
|
(v8::Global::new(scope, context), snapshotted_data)
|
|
};
|
|
|
|
// SAFETY: this is first use of `isolate_ptr` so we are sure we're
|
|
// not overwriting an existing pointer.
|
|
isolate = unsafe {
|
|
isolate_ptr.write(isolate);
|
|
isolate_ptr.read()
|
|
};
|
|
|
|
let mut context_scope: v8::HandleScope =
|
|
v8::HandleScope::with_context(&mut isolate, global_context.clone());
|
|
let scope = &mut context_scope;
|
|
let context = v8::Local::new(scope, global_context.clone());
|
|
|
|
bindings::initialize_context(
|
|
scope,
|
|
context,
|
|
&context_state.borrow().op_ctxs,
|
|
init_mode,
|
|
);
|
|
|
|
context.set_slot(scope, context_state.clone());
|
|
|
|
op_state.borrow_mut().put(isolate_ptr);
|
|
let inspector = if options.inspector {
|
|
Some(JsRuntimeInspector::new(scope, context, options.is_main))
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let loader = options
|
|
.module_loader
|
|
.unwrap_or_else(|| Rc::new(NoopModuleLoader));
|
|
|
|
{
|
|
let global_realm = JsRealmInner::new(
|
|
context_state,
|
|
global_context,
|
|
state_rc.clone(),
|
|
true,
|
|
);
|
|
let mut state = state_rc.borrow_mut();
|
|
state.global_realm = Some(JsRealm::new(global_realm.clone()));
|
|
state.inspector = inspector;
|
|
state.known_realms.push(global_realm);
|
|
}
|
|
scope.set_data(
|
|
STATE_DATA_OFFSET,
|
|
Rc::into_raw(state_rc.clone()) as *mut c_void,
|
|
);
|
|
let module_map_rc = Rc::new(RefCell::new(ModuleMap::new(loader)));
|
|
if let Some(snapshotted_data) = snapshotted_data {
|
|
let mut module_map = module_map_rc.borrow_mut();
|
|
module_map.update_with_snapshotted_data(scope, snapshotted_data);
|
|
}
|
|
scope.set_data(
|
|
MODULE_MAP_DATA_OFFSET,
|
|
Rc::into_raw(module_map_rc.clone()) as *mut c_void,
|
|
);
|
|
|
|
drop(context_scope);
|
|
|
|
let mut js_runtime = JsRuntime {
|
|
inner: InnerIsolateState {
|
|
will_snapshot,
|
|
state: ManuallyDropRc(ManuallyDrop::new(state_rc)),
|
|
v8_isolate: ManuallyDrop::new(isolate),
|
|
},
|
|
init_mode,
|
|
allocations: IsolateAllocations::default(),
|
|
event_loop_middlewares,
|
|
extensions: options.extensions,
|
|
module_map: module_map_rc,
|
|
is_main: options.is_main,
|
|
};
|
|
|
|
let realm = js_runtime.global_realm();
|
|
// TODO(mmastrac): We should thread errors back out of the runtime
|
|
js_runtime
|
|
.init_extension_js(&realm, maybe_load_callback)
|
|
.unwrap();
|
|
|
|
// If the user has requested that we rename modules
|
|
if let Some(rename_modules) = options.rename_modules {
|
|
js_runtime
|
|
.module_map
|
|
.borrow_mut()
|
|
.clear_module_map(rename_modules.into_iter());
|
|
}
|
|
|
|
js_runtime
|
|
}
|
|
|
|
#[cfg(test)]
|
|
#[inline]
|
|
pub(crate) fn module_map(&self) -> &Rc<RefCell<ModuleMap>> {
|
|
&self.module_map
|
|
}
|
|
|
|
#[inline]
|
|
pub fn global_context(&self) -> v8::Global<v8::Context> {
|
|
self
|
|
.inner
|
|
.state
|
|
.borrow()
|
|
.known_realms
|
|
.get(0)
|
|
.unwrap()
|
|
.context()
|
|
.clone()
|
|
}
|
|
|
|
#[inline]
|
|
pub fn v8_isolate(&mut self) -> &mut v8::OwnedIsolate {
|
|
&mut self.inner.v8_isolate
|
|
}
|
|
|
|
#[inline]
|
|
pub fn inspector(&mut self) -> Rc<RefCell<JsRuntimeInspector>> {
|
|
self.inner.state.borrow().inspector()
|
|
}
|
|
|
|
#[inline]
|
|
pub fn global_realm(&mut self) -> JsRealm {
|
|
let state = self.inner.state.borrow();
|
|
state.global_realm.clone().unwrap()
|
|
}
|
|
|
|
/// Returns the extensions that this runtime is using (including internal ones).
|
|
pub fn extensions(&self) -> &Vec<Extension> {
|
|
&self.extensions
|
|
}
|
|
|
|
/// Creates a new realm (V8 context) in this JS execution context,
|
|
/// pre-initialized with all of the extensions that were passed in
|
|
/// [`RuntimeOptions::extensions`] when the [`JsRuntime`] was
|
|
/// constructed.
|
|
pub fn create_realm(&mut self) -> Result<JsRealm, Error> {
|
|
let realm = {
|
|
let context_state = Rc::new(RefCell::new(ContextState::default()));
|
|
let op_ctxs: Box<[OpCtx]> = self
|
|
.global_realm()
|
|
.0
|
|
.state()
|
|
.borrow()
|
|
.op_ctxs
|
|
.iter()
|
|
.map(|op_ctx| {
|
|
OpCtx::new(
|
|
op_ctx.id,
|
|
context_state.clone(),
|
|
op_ctx.decl.clone(),
|
|
op_ctx.state.clone(),
|
|
op_ctx.runtime_state.clone(),
|
|
)
|
|
})
|
|
.collect();
|
|
context_state.borrow_mut().op_ctxs = op_ctxs;
|
|
context_state.borrow_mut().isolate = Some(self.v8_isolate() as _);
|
|
|
|
let raw_ptr = self.v8_isolate() as *mut v8::OwnedIsolate;
|
|
// SAFETY: Having the scope tied to self's lifetime makes it impossible to
|
|
// reference JsRuntimeState::op_ctxs while the scope is alive. Here we
|
|
// turn it into an unbound lifetime, which is sound because 1. it only
|
|
// lives until the end of this block, and 2. the HandleScope only has
|
|
// access to the isolate, and nothing else we're accessing from self does.
|
|
let isolate = unsafe { raw_ptr.as_mut() }.unwrap();
|
|
let scope = &mut v8::HandleScope::new(isolate);
|
|
let context = v8::Context::new(scope);
|
|
let scope = &mut v8::ContextScope::new(scope, context);
|
|
|
|
let context = bindings::initialize_context(
|
|
scope,
|
|
context,
|
|
&context_state.borrow().op_ctxs,
|
|
self.init_mode,
|
|
);
|
|
context.set_slot(scope, context_state.clone());
|
|
let realm = JsRealmInner::new(
|
|
context_state,
|
|
v8::Global::new(scope, context),
|
|
self.inner.state.clone(),
|
|
false,
|
|
);
|
|
let mut state = self.inner.state.borrow_mut();
|
|
state.known_realms.push(realm.clone());
|
|
JsRealm::new(realm)
|
|
};
|
|
|
|
self.init_extension_js(&realm, None)?;
|
|
Ok(realm)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn handle_scope(&mut self) -> v8::HandleScope {
|
|
self.global_realm().handle_scope(self.v8_isolate())
|
|
}
|
|
|
|
/// Initializes JS of provided Extensions in the given realm.
|
|
fn init_extension_js(
|
|
&mut self,
|
|
realm: &JsRealm,
|
|
maybe_load_callback: Option<ExtModuleLoaderCb>,
|
|
) -> Result<(), Error> {
|
|
// Initialization of JS happens in phases:
|
|
// 1. Iterate through all extensions:
|
|
// a. Execute all extension "script" JS files
|
|
// b. Load all extension "module" JS files (but do not execute them yet)
|
|
// 2. Iterate through all extensions:
|
|
// a. If an extension has a `esm_entry_point`, execute it.
|
|
|
|
// Take extensions temporarily so we can avoid have a mutable reference to self
|
|
let extensions = std::mem::take(&mut self.extensions);
|
|
|
|
// TODO(nayeemrmn): Module maps should be per-realm.
|
|
let loader = self.module_map.borrow().loader.clone();
|
|
let ext_loader = Rc::new(ExtModuleLoader::new(
|
|
&extensions,
|
|
maybe_load_callback.map(Rc::new),
|
|
));
|
|
self.module_map.borrow_mut().loader = ext_loader;
|
|
|
|
let mut esm_entrypoints = vec![];
|
|
|
|
futures::executor::block_on(async {
|
|
for extension in &extensions {
|
|
let maybe_esm_entry_point = extension.get_esm_entry_point();
|
|
|
|
if let Some(esm_files) = extension.get_esm_sources() {
|
|
for file_source in esm_files {
|
|
self
|
|
.load_side_module(
|
|
&ModuleSpecifier::parse(file_source.specifier)?,
|
|
None,
|
|
)
|
|
.await?;
|
|
}
|
|
}
|
|
|
|
if let Some(entry_point) = maybe_esm_entry_point {
|
|
esm_entrypoints.push(entry_point);
|
|
}
|
|
|
|
if let Some(js_files) = extension.get_js_sources() {
|
|
for file_source in js_files {
|
|
realm.execute_script(
|
|
self.v8_isolate(),
|
|
file_source.specifier,
|
|
file_source.load()?,
|
|
)?;
|
|
}
|
|
}
|
|
|
|
if extension.is_core {
|
|
self.init_cbs(realm);
|
|
}
|
|
}
|
|
|
|
for specifier in esm_entrypoints {
|
|
let mod_id = {
|
|
self
|
|
.module_map
|
|
.borrow()
|
|
.get_id(specifier, AssertedModuleType::JavaScriptOrWasm)
|
|
.unwrap_or_else(|| {
|
|
panic!("{} not present in the module map", specifier)
|
|
})
|
|
};
|
|
let receiver = self.mod_evaluate(mod_id);
|
|
self.run_event_loop(false).await?;
|
|
receiver
|
|
.await?
|
|
.with_context(|| format!("Couldn't execute '{specifier}'"))?;
|
|
}
|
|
|
|
#[cfg(debug_assertions)]
|
|
{
|
|
let module_map_rc = self.module_map.clone();
|
|
let mut scope = realm.handle_scope(self.v8_isolate());
|
|
let module_map = module_map_rc.borrow();
|
|
module_map.assert_all_modules_evaluated(&mut scope);
|
|
}
|
|
|
|
Ok::<_, anyhow::Error>(())
|
|
})?;
|
|
|
|
self.extensions = extensions;
|
|
self.module_map.borrow_mut().loader = loader;
|
|
Ok(())
|
|
}
|
|
|
|
/// Collects ops from extensions & applies middleware
|
|
fn collect_ops(exts: &mut [Extension]) -> Vec<OpDecl> {
|
|
for (ext, previous_exts) in
|
|
exts.iter().enumerate().map(|(i, ext)| (ext, &exts[..i]))
|
|
{
|
|
ext.check_dependencies(previous_exts);
|
|
}
|
|
|
|
// Middleware
|
|
let middleware: Vec<Box<OpMiddlewareFn>> = exts
|
|
.iter_mut()
|
|
.filter_map(|e| e.init_middleware())
|
|
.collect();
|
|
|
|
// macroware wraps an opfn in all the middleware
|
|
let macroware = move |d| middleware.iter().fold(d, |d, m| m(d));
|
|
|
|
// Flatten ops, apply middlware & override disabled ops
|
|
let ops: Vec<_> = exts
|
|
.iter_mut()
|
|
.filter_map(|e| e.init_ops())
|
|
.flatten()
|
|
.map(|d| OpDecl {
|
|
name: d.name,
|
|
..macroware(d)
|
|
})
|
|
.collect();
|
|
|
|
// In debug build verify there are no duplicate ops.
|
|
#[cfg(debug_assertions)]
|
|
{
|
|
let mut count_by_name = HashMap::new();
|
|
|
|
for op in ops.iter() {
|
|
count_by_name
|
|
.entry(&op.name)
|
|
.or_insert(vec![])
|
|
.push(op.name.to_string());
|
|
}
|
|
|
|
let mut duplicate_ops = vec![];
|
|
for (op_name, _count) in
|
|
count_by_name.iter().filter(|(_k, v)| v.len() > 1)
|
|
{
|
|
duplicate_ops.push(op_name.to_string());
|
|
}
|
|
if !duplicate_ops.is_empty() {
|
|
let mut msg = "Found ops with duplicate names:\n".to_string();
|
|
for op_name in duplicate_ops {
|
|
msg.push_str(&format!(" - {}\n", op_name));
|
|
}
|
|
msg.push_str("Op names need to be unique.");
|
|
panic!("{}", msg);
|
|
}
|
|
}
|
|
|
|
ops
|
|
}
|
|
|
|
/// Initializes ops of provided Extensions
|
|
fn create_opstate(
|
|
options: &mut RuntimeOptions,
|
|
init_mode: InitMode,
|
|
) -> (OpState, Vec<OpDecl>) {
|
|
// Add built-in extension
|
|
if init_mode == InitMode::FromSnapshot {
|
|
options
|
|
.extensions
|
|
.insert(0, crate::ops_builtin::core::init_ops());
|
|
} else {
|
|
options
|
|
.extensions
|
|
.insert(0, crate::ops_builtin::core::init_ops_and_esm());
|
|
}
|
|
|
|
let ops = Self::collect_ops(&mut options.extensions);
|
|
|
|
let mut op_state = OpState::new(ops.len());
|
|
|
|
if let Some(get_error_class_fn) = options.get_error_class_fn {
|
|
op_state.get_error_class_fn = get_error_class_fn;
|
|
}
|
|
|
|
// Setup state
|
|
for e in &mut options.extensions {
|
|
// ops are already registered during in bindings::initialize_context();
|
|
e.init_state(&mut op_state);
|
|
}
|
|
|
|
(op_state, ops)
|
|
}
|
|
|
|
pub fn eval<'s, T>(
|
|
scope: &mut v8::HandleScope<'s>,
|
|
code: &str,
|
|
) -> Option<v8::Local<'s, T>>
|
|
where
|
|
v8::Local<'s, T>: TryFrom<v8::Local<'s, v8::Value>, Error = v8::DataError>,
|
|
{
|
|
let scope = &mut v8::EscapableHandleScope::new(scope);
|
|
let source = v8::String::new(scope, code).unwrap();
|
|
let script = v8::Script::compile(scope, source, None).unwrap();
|
|
let v = script.run(scope)?;
|
|
scope.escape(v).try_into().ok()
|
|
}
|
|
|
|
/// Grabs a reference to core.js' eventLoopTick & buildCustomError
|
|
fn init_cbs(&mut self, realm: &JsRealm) {
|
|
let (event_loop_tick_cb, build_custom_error_cb) = {
|
|
let scope = &mut realm.handle_scope(self.v8_isolate());
|
|
let context = realm.context();
|
|
let context_local = v8::Local::new(scope, context);
|
|
let global = context_local.global(scope);
|
|
let deno_str =
|
|
v8::String::new_external_onebyte_static(scope, b"Deno").unwrap();
|
|
let core_str =
|
|
v8::String::new_external_onebyte_static(scope, b"core").unwrap();
|
|
let event_loop_tick_str =
|
|
v8::String::new_external_onebyte_static(scope, b"eventLoopTick")
|
|
.unwrap();
|
|
let build_custom_error_str =
|
|
v8::String::new_external_onebyte_static(scope, b"buildCustomError")
|
|
.unwrap();
|
|
|
|
let deno_obj: v8::Local<v8::Object> = global
|
|
.get(scope, deno_str.into())
|
|
.unwrap()
|
|
.try_into()
|
|
.unwrap();
|
|
let core_obj: v8::Local<v8::Object> = deno_obj
|
|
.get(scope, core_str.into())
|
|
.unwrap()
|
|
.try_into()
|
|
.unwrap();
|
|
|
|
let event_loop_tick_cb: v8::Local<v8::Function> = core_obj
|
|
.get(scope, event_loop_tick_str.into())
|
|
.unwrap()
|
|
.try_into()
|
|
.unwrap();
|
|
let build_custom_error_cb: v8::Local<v8::Function> = core_obj
|
|
.get(scope, build_custom_error_str.into())
|
|
.unwrap()
|
|
.try_into()
|
|
.unwrap();
|
|
(
|
|
v8::Global::new(scope, event_loop_tick_cb),
|
|
v8::Global::new(scope, build_custom_error_cb),
|
|
)
|
|
};
|
|
|
|
// Put global handles in the realm's ContextState
|
|
let state_rc = realm.0.state();
|
|
let mut state = state_rc.borrow_mut();
|
|
state
|
|
.js_event_loop_tick_cb
|
|
.replace(Rc::new(event_loop_tick_cb));
|
|
state
|
|
.js_build_custom_error_cb
|
|
.replace(Rc::new(build_custom_error_cb));
|
|
}
|
|
|
|
/// Returns the runtime's op state, which can be used to maintain ops
|
|
/// and access resources between op calls.
|
|
pub fn op_state(&mut self) -> Rc<RefCell<OpState>> {
|
|
let state = self.inner.state.borrow();
|
|
state.op_state.clone()
|
|
}
|
|
|
|
/// Executes traditional JavaScript code (traditional = not ES modules).
|
|
///
|
|
/// The execution takes place on the current global context, so it is possible
|
|
/// to maintain local JS state and invoke this method multiple times.
|
|
///
|
|
/// `name` can be a filepath or any other string, but it is required to be 7-bit ASCII, eg.
|
|
///
|
|
/// - "/some/file/path.js"
|
|
/// - "<anon>"
|
|
/// - "[native code]"
|
|
///
|
|
/// The same `name` value can be used for multiple executions.
|
|
///
|
|
/// `Error` can usually be downcast to `JsError`.
|
|
pub fn execute_script(
|
|
&mut self,
|
|
name: &'static str,
|
|
source_code: ModuleCode,
|
|
) -> Result<v8::Global<v8::Value>, Error> {
|
|
self
|
|
.global_realm()
|
|
.execute_script(self.v8_isolate(), name, source_code)
|
|
}
|
|
|
|
/// Executes traditional JavaScript code (traditional = not ES modules).
|
|
///
|
|
/// The execution takes place on the current global context, so it is possible
|
|
/// to maintain local JS state and invoke this method multiple times.
|
|
///
|
|
/// `name` can be a filepath or any other string, but it is required to be 7-bit ASCII, eg.
|
|
///
|
|
/// - "/some/file/path.js"
|
|
/// - "<anon>"
|
|
/// - "[native code]"
|
|
///
|
|
/// The same `name` value can be used for multiple executions.
|
|
///
|
|
/// `Error` can usually be downcast to `JsError`.
|
|
pub fn execute_script_static(
|
|
&mut self,
|
|
name: &'static str,
|
|
source_code: &'static str,
|
|
) -> Result<v8::Global<v8::Value>, Error> {
|
|
self.global_realm().execute_script(
|
|
self.v8_isolate(),
|
|
name,
|
|
ModuleCode::from_static(source_code),
|
|
)
|
|
}
|
|
|
|
/// Call a function. If it returns a promise, run the event loop until that
|
|
/// promise is settled. If the promise rejects or there is an uncaught error
|
|
/// in the event loop, return `Err(error)`. Or return `Ok(<await returned>)`.
|
|
pub async fn call_and_await(
|
|
&mut self,
|
|
function: &v8::Global<v8::Function>,
|
|
) -> Result<v8::Global<v8::Value>, Error> {
|
|
let promise = {
|
|
let scope = &mut self.handle_scope();
|
|
let cb = function.open(scope);
|
|
let this = v8::undefined(scope).into();
|
|
let promise = cb.call(scope, this, &[]);
|
|
if promise.is_none() || scope.is_execution_terminating() {
|
|
let undefined = v8::undefined(scope).into();
|
|
return exception_to_err_result(scope, undefined, false);
|
|
}
|
|
v8::Global::new(scope, promise.unwrap())
|
|
};
|
|
self.resolve_value(promise).await
|
|
}
|
|
|
|
/// Returns the namespace object of a module.
|
|
///
|
|
/// This is only available after module evaluation has completed.
|
|
/// This function panics if module has not been instantiated.
|
|
pub fn get_module_namespace(
|
|
&mut self,
|
|
module_id: ModuleId,
|
|
) -> Result<v8::Global<v8::Object>, Error> {
|
|
self
|
|
.module_map
|
|
.clone()
|
|
.borrow()
|
|
.get_module_namespace(&mut self.handle_scope(), module_id)
|
|
}
|
|
|
|
/// Registers a callback on the isolate when the memory limits are approached.
|
|
/// Use this to prevent V8 from crashing the process when reaching the limit.
|
|
///
|
|
/// Calls the closure with the current heap limit and the initial heap limit.
|
|
/// The return value of the closure is set as the new limit.
|
|
pub fn add_near_heap_limit_callback<C>(&mut self, cb: C)
|
|
where
|
|
C: FnMut(usize, usize) -> usize + 'static,
|
|
{
|
|
let boxed_cb = Box::new(RefCell::new(cb));
|
|
let data = boxed_cb.as_ptr() as *mut c_void;
|
|
|
|
let prev = self
|
|
.allocations
|
|
.near_heap_limit_callback_data
|
|
.replace((boxed_cb, near_heap_limit_callback::<C>));
|
|
if let Some((_, prev_cb)) = prev {
|
|
self
|
|
.v8_isolate()
|
|
.remove_near_heap_limit_callback(prev_cb, 0);
|
|
}
|
|
|
|
self
|
|
.v8_isolate()
|
|
.add_near_heap_limit_callback(near_heap_limit_callback::<C>, data);
|
|
}
|
|
|
|
pub fn remove_near_heap_limit_callback(&mut self, heap_limit: usize) {
|
|
if let Some((_, cb)) = self.allocations.near_heap_limit_callback_data.take()
|
|
{
|
|
self
|
|
.v8_isolate()
|
|
.remove_near_heap_limit_callback(cb, heap_limit);
|
|
}
|
|
}
|
|
|
|
fn pump_v8_message_loop(&mut self) -> Result<(), Error> {
|
|
let scope = &mut self.handle_scope();
|
|
while v8::Platform::pump_message_loop(
|
|
&v8::V8::get_current_platform(),
|
|
scope,
|
|
false, // don't block if there are no tasks
|
|
) {
|
|
// do nothing
|
|
}
|
|
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
tc_scope.perform_microtask_checkpoint();
|
|
match tc_scope.exception() {
|
|
None => Ok(()),
|
|
Some(exception) => exception_to_err_result(tc_scope, exception, false),
|
|
}
|
|
}
|
|
|
|
pub fn maybe_init_inspector(&mut self) {
|
|
if self.inner.state.borrow().inspector.is_some() {
|
|
return;
|
|
}
|
|
|
|
let context = self.global_context();
|
|
let scope = &mut v8::HandleScope::with_context(
|
|
self.inner.v8_isolate.as_mut(),
|
|
context.clone(),
|
|
);
|
|
let context = v8::Local::new(scope, context);
|
|
|
|
let mut state = self.inner.state.borrow_mut();
|
|
state.inspector =
|
|
Some(JsRuntimeInspector::new(scope, context, self.is_main));
|
|
}
|
|
|
|
pub fn poll_value(
|
|
&mut self,
|
|
global: &v8::Global<v8::Value>,
|
|
cx: &mut Context,
|
|
) -> Poll<Result<v8::Global<v8::Value>, Error>> {
|
|
let state = self.poll_event_loop(cx, false);
|
|
|
|
let mut scope = self.handle_scope();
|
|
let local = v8::Local::<v8::Value>::new(&mut scope, global);
|
|
|
|
if let Ok(promise) = v8::Local::<v8::Promise>::try_from(local) {
|
|
match promise.state() {
|
|
v8::PromiseState::Pending => match state {
|
|
Poll::Ready(Ok(_)) => {
|
|
let msg = "Promise resolution is still pending but the event loop has already resolved.";
|
|
Poll::Ready(Err(generic_error(msg)))
|
|
}
|
|
Poll::Ready(Err(e)) => Poll::Ready(Err(e)),
|
|
Poll::Pending => Poll::Pending,
|
|
},
|
|
v8::PromiseState::Fulfilled => {
|
|
let value = promise.result(&mut scope);
|
|
let value_handle = v8::Global::new(&mut scope, value);
|
|
Poll::Ready(Ok(value_handle))
|
|
}
|
|
v8::PromiseState::Rejected => {
|
|
let exception = promise.result(&mut scope);
|
|
Poll::Ready(exception_to_err_result(&mut scope, exception, false))
|
|
}
|
|
}
|
|
} else {
|
|
let value_handle = v8::Global::new(&mut scope, local);
|
|
Poll::Ready(Ok(value_handle))
|
|
}
|
|
}
|
|
|
|
/// Waits for the given value to resolve while polling the event loop.
|
|
///
|
|
/// This future resolves when either the value is resolved or the event loop runs to
|
|
/// completion.
|
|
pub async fn resolve_value(
|
|
&mut self,
|
|
global: v8::Global<v8::Value>,
|
|
) -> Result<v8::Global<v8::Value>, Error> {
|
|
poll_fn(|cx| self.poll_value(&global, cx)).await
|
|
}
|
|
|
|
/// Runs event loop to completion
|
|
///
|
|
/// This future resolves when:
|
|
/// - there are no more pending dynamic imports
|
|
/// - there are no more pending ops
|
|
/// - there are no more active inspector sessions (only if `wait_for_inspector` is set to true)
|
|
pub async fn run_event_loop(
|
|
&mut self,
|
|
wait_for_inspector: bool,
|
|
) -> Result<(), Error> {
|
|
poll_fn(|cx| self.poll_event_loop(cx, wait_for_inspector)).await
|
|
}
|
|
|
|
/// Runs a single tick of event loop
|
|
///
|
|
/// If `wait_for_inspector` is set to true event loop
|
|
/// will return `Poll::Pending` if there are active inspector sessions.
|
|
pub fn poll_event_loop(
|
|
&mut self,
|
|
cx: &mut Context,
|
|
wait_for_inspector: bool,
|
|
) -> Poll<Result<(), Error>> {
|
|
let has_inspector: bool;
|
|
|
|
{
|
|
let state = self.inner.state.borrow();
|
|
has_inspector = state.inspector.is_some();
|
|
state.op_state.borrow().waker.register(cx.waker());
|
|
}
|
|
|
|
if has_inspector {
|
|
// We poll the inspector first.
|
|
let _ = self.inspector().borrow().poll_sessions(Some(cx)).unwrap();
|
|
}
|
|
|
|
let module_map = self.module_map.clone();
|
|
self.pump_v8_message_loop()?;
|
|
|
|
// Dynamic module loading - ie. modules loaded using "import()"
|
|
{
|
|
// Run in a loop so that dynamic imports that only depend on another
|
|
// dynamic import can be resolved in this event loop iteration.
|
|
//
|
|
// For example, a dynamically imported module like the following can be
|
|
// immediately resolved after `dependency.ts` is fully evaluated, but it
|
|
// wouldn't if not for this loop.
|
|
//
|
|
// await delay(1000);
|
|
// await import("./dependency.ts");
|
|
// console.log("test")
|
|
//
|
|
loop {
|
|
let poll_imports = self.prepare_dyn_imports(cx)?;
|
|
assert!(poll_imports.is_ready());
|
|
|
|
let poll_imports = self.poll_dyn_imports(cx)?;
|
|
assert!(poll_imports.is_ready());
|
|
|
|
if !self.evaluate_dyn_imports() {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Resolve async ops, run all next tick callbacks and macrotasks callbacks
|
|
// and only then check for any promise exceptions (`unhandledrejection`
|
|
// handlers are run in macrotasks callbacks so we need to let them run
|
|
// first).
|
|
self.do_js_event_loop_tick(cx)?;
|
|
self.check_promise_rejections()?;
|
|
|
|
// Event loop middlewares
|
|
let mut maybe_scheduling = false;
|
|
{
|
|
let op_state = self.inner.state.borrow().op_state.clone();
|
|
for f in &self.event_loop_middlewares {
|
|
if f(op_state.clone(), cx) {
|
|
maybe_scheduling = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Top level module
|
|
self.evaluate_pending_module();
|
|
|
|
let pending_state = self.event_loop_pending_state();
|
|
if !pending_state.is_pending() && !maybe_scheduling {
|
|
if has_inspector {
|
|
let inspector = self.inspector();
|
|
let has_active_sessions = inspector.borrow().has_active_sessions();
|
|
let has_blocking_sessions = inspector.borrow().has_blocking_sessions();
|
|
|
|
if wait_for_inspector && has_active_sessions {
|
|
// If there are no blocking sessions (eg. REPL) we can now notify
|
|
// debugger that the program has finished running and we're ready
|
|
// to exit the process once debugger disconnects.
|
|
if !has_blocking_sessions {
|
|
let context = self.global_context();
|
|
let scope = &mut self.handle_scope();
|
|
inspector.borrow_mut().context_destroyed(scope, context);
|
|
println!("Program finished. Waiting for inspector to disconnect to exit the process...");
|
|
}
|
|
|
|
return Poll::Pending;
|
|
}
|
|
}
|
|
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
let state = self.inner.state.borrow();
|
|
|
|
// Check if more async ops have been dispatched
|
|
// during this turn of event loop.
|
|
// If there are any pending background tasks, we also wake the runtime to
|
|
// make sure we don't miss them.
|
|
// TODO(andreubotella) The event loop will spin as long as there are pending
|
|
// background tasks. We should look into having V8 notify us when a
|
|
// background task is done.
|
|
if pending_state.has_pending_background_tasks
|
|
|| pending_state.has_tick_scheduled
|
|
|| maybe_scheduling
|
|
{
|
|
state.op_state.borrow().waker.wake();
|
|
}
|
|
|
|
drop(state);
|
|
|
|
if pending_state.has_pending_module_evaluation {
|
|
if pending_state.has_pending_refed_ops
|
|
|| pending_state.has_pending_dyn_imports
|
|
|| pending_state.has_pending_dyn_module_evaluation
|
|
|| pending_state.has_pending_background_tasks
|
|
|| pending_state.has_tick_scheduled
|
|
|| maybe_scheduling
|
|
{
|
|
// pass, will be polled again
|
|
} else {
|
|
let scope = &mut self.handle_scope();
|
|
let messages = module_map.borrow().find_stalled_top_level_await(scope);
|
|
// We are gonna print only a single message to provide a nice formatting
|
|
// with source line of offending promise shown. Once user fixed it, then
|
|
// they will get another error message for the next promise (but this
|
|
// situation is gonna be very rare, if ever happening).
|
|
assert!(!messages.is_empty());
|
|
let msg = v8::Local::new(scope, messages[0].clone());
|
|
let js_error = JsError::from_v8_message(scope, msg);
|
|
return Poll::Ready(Err(js_error.into()));
|
|
}
|
|
}
|
|
|
|
if pending_state.has_pending_dyn_module_evaluation {
|
|
if pending_state.has_pending_refed_ops
|
|
|| pending_state.has_pending_dyn_imports
|
|
|| pending_state.has_pending_background_tasks
|
|
|| pending_state.has_tick_scheduled
|
|
{
|
|
// pass, will be polled again
|
|
} else if self.inner.state.borrow().dyn_module_evaluate_idle_counter >= 1
|
|
{
|
|
let scope = &mut self.handle_scope();
|
|
let messages = module_map.borrow().find_stalled_top_level_await(scope);
|
|
// We are gonna print only a single message to provide a nice formatting
|
|
// with source line of offending promise shown. Once user fixed it, then
|
|
// they will get another error message for the next promise (but this
|
|
// situation is gonna be very rare, if ever happening).
|
|
assert!(!messages.is_empty());
|
|
let msg = v8::Local::new(scope, messages[0].clone());
|
|
let js_error = JsError::from_v8_message(scope, msg);
|
|
return Poll::Ready(Err(js_error.into()));
|
|
} else {
|
|
let mut state = self.inner.state.borrow_mut();
|
|
// Delay the above error by one spin of the event loop. A dynamic import
|
|
// evaluation may complete during this, in which case the counter will
|
|
// reset.
|
|
state.dyn_module_evaluate_idle_counter += 1;
|
|
state.op_state.borrow().waker.wake();
|
|
}
|
|
}
|
|
|
|
Poll::Pending
|
|
}
|
|
|
|
fn event_loop_pending_state(&mut self) -> EventLoopPendingState {
|
|
let mut scope = v8::HandleScope::new(self.inner.v8_isolate.as_mut());
|
|
EventLoopPendingState::new(
|
|
&mut scope,
|
|
&mut self.inner.state.borrow_mut(),
|
|
&self.module_map.borrow(),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl JsRuntimeForSnapshot {
|
|
pub fn new(
|
|
mut options: RuntimeOptions,
|
|
runtime_snapshot_options: RuntimeSnapshotOptions,
|
|
) -> JsRuntimeForSnapshot {
|
|
JsRuntime::init_v8(options.v8_platform.take(), true);
|
|
JsRuntimeForSnapshot(JsRuntime::new_inner(
|
|
options,
|
|
true,
|
|
runtime_snapshot_options.snapshot_module_load_cb,
|
|
))
|
|
}
|
|
|
|
/// Takes a snapshot and consumes the runtime.
|
|
///
|
|
/// `Error` can usually be downcast to `JsError`.
|
|
pub fn snapshot(mut self) -> v8::StartupData {
|
|
// Ensure there are no live inspectors to prevent crashes.
|
|
self.inner.prepare_for_cleanup();
|
|
|
|
// Set the context to be snapshot's default context
|
|
{
|
|
let context = self.global_context();
|
|
let mut scope = self.handle_scope();
|
|
let local_context = v8::Local::new(&mut scope, context);
|
|
scope.set_default_context(local_context);
|
|
}
|
|
|
|
// Serialize the module map and store its data in the snapshot.
|
|
{
|
|
let snapshotted_data = {
|
|
// `self.module_map` points directly to the v8 isolate data slot, which
|
|
// we must explicitly drop before destroying the isolate. We have to
|
|
// take and drop this `Rc` before that.
|
|
let module_map_rc = std::mem::take(&mut self.module_map);
|
|
let module_map = module_map_rc.borrow();
|
|
module_map.serialize_for_snapshotting(&mut self.handle_scope())
|
|
};
|
|
|
|
let context = self.global_context();
|
|
let mut scope = self.handle_scope();
|
|
snapshot_util::set_snapshotted_data(
|
|
&mut scope,
|
|
context,
|
|
snapshotted_data,
|
|
);
|
|
}
|
|
|
|
self
|
|
.0
|
|
.inner
|
|
.prepare_for_snapshot()
|
|
.create_blob(v8::FunctionCodeHandling::Keep)
|
|
.unwrap()
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
|
|
pub(crate) struct EventLoopPendingState {
|
|
has_pending_refed_ops: bool,
|
|
has_pending_dyn_imports: bool,
|
|
has_pending_dyn_module_evaluation: bool,
|
|
has_pending_module_evaluation: bool,
|
|
has_pending_background_tasks: bool,
|
|
has_tick_scheduled: bool,
|
|
}
|
|
impl EventLoopPendingState {
|
|
pub fn new(
|
|
scope: &mut v8::HandleScope<()>,
|
|
state: &mut JsRuntimeState,
|
|
module_map: &ModuleMap,
|
|
) -> EventLoopPendingState {
|
|
let mut num_unrefed_ops = 0;
|
|
let mut num_pending_ops = 0;
|
|
for realm in &state.known_realms {
|
|
num_unrefed_ops += realm.num_unrefed_ops();
|
|
num_pending_ops += realm.num_pending_ops();
|
|
}
|
|
|
|
EventLoopPendingState {
|
|
has_pending_refed_ops: num_pending_ops > num_unrefed_ops,
|
|
has_pending_dyn_imports: module_map.has_pending_dynamic_imports(),
|
|
has_pending_dyn_module_evaluation: !state
|
|
.pending_dyn_mod_evaluate
|
|
.is_empty(),
|
|
has_pending_module_evaluation: state.pending_mod_evaluate.is_some(),
|
|
has_pending_background_tasks: scope.has_pending_background_tasks(),
|
|
has_tick_scheduled: state.has_tick_scheduled,
|
|
}
|
|
}
|
|
|
|
pub fn is_pending(&self) -> bool {
|
|
self.has_pending_refed_ops
|
|
|| self.has_pending_dyn_imports
|
|
|| self.has_pending_dyn_module_evaluation
|
|
|| self.has_pending_module_evaluation
|
|
|| self.has_pending_background_tasks
|
|
|| self.has_tick_scheduled
|
|
}
|
|
}
|
|
|
|
extern "C" fn near_heap_limit_callback<F>(
|
|
data: *mut c_void,
|
|
current_heap_limit: usize,
|
|
initial_heap_limit: usize,
|
|
) -> usize
|
|
where
|
|
F: FnMut(usize, usize) -> usize,
|
|
{
|
|
// SAFETY: The data is a pointer to the Rust callback function. It is stored
|
|
// in `JsRuntime::allocations` and thus is guaranteed to outlive the isolate.
|
|
let callback = unsafe { &mut *(data as *mut F) };
|
|
callback(current_heap_limit, initial_heap_limit)
|
|
}
|
|
|
|
impl JsRuntimeState {
|
|
pub(crate) fn inspector(&self) -> Rc<RefCell<JsRuntimeInspector>> {
|
|
self.inspector.as_ref().unwrap().clone()
|
|
}
|
|
|
|
/// Called by `bindings::host_import_module_dynamically_callback`
|
|
/// after initiating new dynamic import load.
|
|
pub fn notify_new_dynamic_import(&mut self) {
|
|
// Notify event loop to poll again soon.
|
|
self.op_state.borrow().waker.wake();
|
|
}
|
|
}
|
|
|
|
// Related to module loading
|
|
impl JsRuntime {
|
|
pub(crate) fn instantiate_module(
|
|
&mut self,
|
|
id: ModuleId,
|
|
) -> Result<(), v8::Global<v8::Value>> {
|
|
self
|
|
.module_map
|
|
.clone()
|
|
.borrow_mut()
|
|
.instantiate_module(&mut self.handle_scope(), id)
|
|
}
|
|
|
|
fn dynamic_import_module_evaluate(
|
|
&mut self,
|
|
load_id: ModuleLoadId,
|
|
id: ModuleId,
|
|
) -> Result<(), Error> {
|
|
let module_handle = self
|
|
.module_map
|
|
.borrow()
|
|
.get_handle(id)
|
|
.expect("ModuleInfo not found");
|
|
|
|
let status = {
|
|
let scope = &mut self.handle_scope();
|
|
let module = module_handle.open(scope);
|
|
module.get_status()
|
|
};
|
|
|
|
match status {
|
|
v8::ModuleStatus::Instantiated | v8::ModuleStatus::Evaluated => {}
|
|
_ => return Ok(()),
|
|
}
|
|
|
|
// IMPORTANT: Top-level-await is enabled, which means that return value
|
|
// of module evaluation is a promise.
|
|
//
|
|
// This promise is internal, and not the same one that gets returned to
|
|
// the user. We add an empty `.catch()` handler so that it does not result
|
|
// in an exception if it rejects. That will instead happen for the other
|
|
// promise if not handled by the user.
|
|
//
|
|
// For more details see:
|
|
// https://github.com/denoland/deno/issues/4908
|
|
// https://v8.dev/features/top-level-await#module-execution-order
|
|
let global_realm =
|
|
self.inner.state.borrow_mut().global_realm.clone().unwrap();
|
|
let scope = &mut global_realm.handle_scope(&mut self.inner.v8_isolate);
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
let module = v8::Local::new(tc_scope, &module_handle);
|
|
let maybe_value = module.evaluate(tc_scope);
|
|
|
|
// Update status after evaluating.
|
|
let status = module.get_status();
|
|
|
|
if let Some(value) = maybe_value {
|
|
assert!(
|
|
status == v8::ModuleStatus::Evaluated
|
|
|| status == v8::ModuleStatus::Errored
|
|
);
|
|
let promise = v8::Local::<v8::Promise>::try_from(value)
|
|
.expect("Expected to get promise as module evaluation result");
|
|
let empty_fn = bindings::create_empty_fn(tc_scope).unwrap();
|
|
promise.catch(tc_scope, empty_fn);
|
|
let promise_global = v8::Global::new(tc_scope, promise);
|
|
let module_global = v8::Global::new(tc_scope, module);
|
|
|
|
let dyn_import_mod_evaluate = DynImportModEvaluate {
|
|
load_id,
|
|
module_id: id,
|
|
promise: promise_global,
|
|
module: module_global,
|
|
};
|
|
|
|
self
|
|
.inner
|
|
.state
|
|
.borrow_mut()
|
|
.pending_dyn_mod_evaluate
|
|
.push(dyn_import_mod_evaluate);
|
|
} else if tc_scope.has_terminated() || tc_scope.is_execution_terminating() {
|
|
return Err(
|
|
generic_error("Cannot evaluate dynamically imported module, because JavaScript execution has been terminated.")
|
|
);
|
|
} else {
|
|
assert!(status == v8::ModuleStatus::Errored);
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
// TODO(bartlomieju): make it return `ModuleEvaluationFuture`?
|
|
/// Evaluates an already instantiated ES module.
|
|
///
|
|
/// Returns a receiver handle that resolves when module promise resolves.
|
|
/// Implementors must manually call [`JsRuntime::run_event_loop`] to drive
|
|
/// module evaluation future.
|
|
///
|
|
/// `Error` can usually be downcast to `JsError` and should be awaited and
|
|
/// checked after [`JsRuntime::run_event_loop`] completion.
|
|
///
|
|
/// This function panics if module has not been instantiated.
|
|
pub fn mod_evaluate(
|
|
&mut self,
|
|
id: ModuleId,
|
|
) -> oneshot::Receiver<Result<(), Error>> {
|
|
let global_realm = self.global_realm();
|
|
let state_rc = self.inner.state.clone();
|
|
let module_map_rc = self.module_map.clone();
|
|
let scope = &mut self.handle_scope();
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
|
|
let module = module_map_rc
|
|
.borrow()
|
|
.get_handle(id)
|
|
.map(|handle| v8::Local::new(tc_scope, handle))
|
|
.expect("ModuleInfo not found");
|
|
let mut status = module.get_status();
|
|
assert_eq!(
|
|
status,
|
|
v8::ModuleStatus::Instantiated,
|
|
"Module not instantiated {id}"
|
|
);
|
|
|
|
let (sender, receiver) = oneshot::channel();
|
|
|
|
// IMPORTANT: Top-level-await is enabled, which means that return value
|
|
// of module evaluation is a promise.
|
|
//
|
|
// Because that promise is created internally by V8, when error occurs during
|
|
// module evaluation the promise is rejected, and since the promise has no rejection
|
|
// handler it will result in call to `bindings::promise_reject_callback` adding
|
|
// the promise to pending promise rejection table - meaning JsRuntime will return
|
|
// error on next poll().
|
|
//
|
|
// This situation is not desirable as we want to manually return error at the
|
|
// end of this function to handle it further. It means we need to manually
|
|
// remove this promise from pending promise rejection table.
|
|
//
|
|
// For more details see:
|
|
// https://github.com/denoland/deno/issues/4908
|
|
// https://v8.dev/features/top-level-await#module-execution-order
|
|
{
|
|
let mut state = state_rc.borrow_mut();
|
|
assert!(
|
|
state.pending_mod_evaluate.is_none(),
|
|
"There is already pending top level module evaluation"
|
|
);
|
|
state.pending_mod_evaluate = Some(ModEvaluate {
|
|
promise: None,
|
|
has_evaluated: false,
|
|
handled_promise_rejections: vec![],
|
|
sender,
|
|
});
|
|
}
|
|
|
|
let maybe_value = module.evaluate(tc_scope);
|
|
{
|
|
let mut state = state_rc.borrow_mut();
|
|
let pending_mod_evaluate = state.pending_mod_evaluate.as_mut().unwrap();
|
|
pending_mod_evaluate.has_evaluated = true;
|
|
}
|
|
|
|
// Update status after evaluating.
|
|
status = module.get_status();
|
|
|
|
let has_dispatched_exception =
|
|
state_rc.borrow_mut().dispatched_exception.is_some();
|
|
if has_dispatched_exception {
|
|
// This will be overrided in `exception_to_err_result()`.
|
|
let exception = v8::undefined(tc_scope).into();
|
|
let pending_mod_evaluate = {
|
|
let mut state = state_rc.borrow_mut();
|
|
state.pending_mod_evaluate.take().unwrap()
|
|
};
|
|
pending_mod_evaluate
|
|
.sender
|
|
.send(exception_to_err_result(tc_scope, exception, false))
|
|
.expect("Failed to send module evaluation error.");
|
|
} else if let Some(value) = maybe_value {
|
|
assert!(
|
|
status == v8::ModuleStatus::Evaluated
|
|
|| status == v8::ModuleStatus::Errored
|
|
);
|
|
let promise = v8::Local::<v8::Promise>::try_from(value)
|
|
.expect("Expected to get promise as module evaluation result");
|
|
let promise_global = v8::Global::new(tc_scope, promise);
|
|
let mut state = state_rc.borrow_mut();
|
|
{
|
|
let pending_mod_evaluate = state.pending_mod_evaluate.as_ref().unwrap();
|
|
let pending_rejection_was_already_handled = pending_mod_evaluate
|
|
.handled_promise_rejections
|
|
.contains(&promise_global);
|
|
if !pending_rejection_was_already_handled {
|
|
global_realm
|
|
.0
|
|
.state()
|
|
.borrow_mut()
|
|
.pending_promise_rejections
|
|
.retain(|(key, _)| key != &promise_global);
|
|
}
|
|
}
|
|
let promise_global = v8::Global::new(tc_scope, promise);
|
|
state.pending_mod_evaluate.as_mut().unwrap().promise =
|
|
Some(promise_global);
|
|
tc_scope.perform_microtask_checkpoint();
|
|
} else if tc_scope.has_terminated() || tc_scope.is_execution_terminating() {
|
|
let pending_mod_evaluate = {
|
|
let mut state = state_rc.borrow_mut();
|
|
state.pending_mod_evaluate.take().unwrap()
|
|
};
|
|
pending_mod_evaluate.sender.send(Err(
|
|
generic_error("Cannot evaluate module, because JavaScript execution has been terminated.")
|
|
)).expect("Failed to send module evaluation error.");
|
|
} else {
|
|
assert!(status == v8::ModuleStatus::Errored);
|
|
}
|
|
|
|
receiver
|
|
}
|
|
|
|
fn dynamic_import_reject(
|
|
&mut self,
|
|
id: ModuleLoadId,
|
|
exception: v8::Global<v8::Value>,
|
|
) {
|
|
let module_map_rc = self.module_map.clone();
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let resolver_handle = module_map_rc
|
|
.borrow_mut()
|
|
.dynamic_import_map
|
|
.remove(&id)
|
|
.expect("Invalid dynamic import id");
|
|
let resolver = resolver_handle.open(scope);
|
|
|
|
// IMPORTANT: No borrows to `ModuleMap` can be held at this point because
|
|
// rejecting the promise might initiate another `import()` which will
|
|
// in turn call `bindings::host_import_module_dynamically_callback` which
|
|
// will reach into `ModuleMap` from within the isolate.
|
|
let exception = v8::Local::new(scope, exception);
|
|
resolver.reject(scope, exception).unwrap();
|
|
scope.perform_microtask_checkpoint();
|
|
}
|
|
|
|
fn dynamic_import_resolve(&mut self, id: ModuleLoadId, mod_id: ModuleId) {
|
|
let state_rc = self.inner.state.clone();
|
|
let module_map_rc = self.module_map.clone();
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let resolver_handle = module_map_rc
|
|
.borrow_mut()
|
|
.dynamic_import_map
|
|
.remove(&id)
|
|
.expect("Invalid dynamic import id");
|
|
let resolver = resolver_handle.open(scope);
|
|
|
|
let module = {
|
|
module_map_rc
|
|
.borrow()
|
|
.get_handle(mod_id)
|
|
.map(|handle| v8::Local::new(scope, handle))
|
|
.expect("Dyn import module info not found")
|
|
};
|
|
// Resolution success
|
|
assert_eq!(module.get_status(), v8::ModuleStatus::Evaluated);
|
|
|
|
// IMPORTANT: No borrows to `ModuleMap` can be held at this point because
|
|
// resolving the promise might initiate another `import()` which will
|
|
// in turn call `bindings::host_import_module_dynamically_callback` which
|
|
// will reach into `ModuleMap` from within the isolate.
|
|
let module_namespace = module.get_module_namespace();
|
|
resolver.resolve(scope, module_namespace).unwrap();
|
|
state_rc.borrow_mut().dyn_module_evaluate_idle_counter = 0;
|
|
scope.perform_microtask_checkpoint();
|
|
}
|
|
|
|
fn prepare_dyn_imports(
|
|
&mut self,
|
|
cx: &mut Context,
|
|
) -> Poll<Result<(), Error>> {
|
|
if self
|
|
.module_map
|
|
.borrow()
|
|
.preparing_dynamic_imports
|
|
.is_empty()
|
|
{
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
loop {
|
|
let poll_result = self
|
|
.module_map
|
|
.borrow_mut()
|
|
.preparing_dynamic_imports
|
|
.poll_next_unpin(cx);
|
|
|
|
if let Poll::Ready(Some(prepare_poll)) = poll_result {
|
|
let dyn_import_id = prepare_poll.0;
|
|
let prepare_result = prepare_poll.1;
|
|
|
|
match prepare_result {
|
|
Ok(load) => {
|
|
self
|
|
.module_map
|
|
.borrow_mut()
|
|
.pending_dynamic_imports
|
|
.push(load.into_future());
|
|
}
|
|
Err(err) => {
|
|
let exception = to_v8_type_error(&mut self.handle_scope(), err);
|
|
self.dynamic_import_reject(dyn_import_id, exception);
|
|
}
|
|
}
|
|
// Continue polling for more prepared dynamic imports.
|
|
continue;
|
|
}
|
|
|
|
// There are no active dynamic import loads, or none are ready.
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
}
|
|
|
|
fn poll_dyn_imports(&mut self, cx: &mut Context) -> Poll<Result<(), Error>> {
|
|
if self.module_map.borrow().pending_dynamic_imports.is_empty() {
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
loop {
|
|
let poll_result = self
|
|
.module_map
|
|
.borrow_mut()
|
|
.pending_dynamic_imports
|
|
.poll_next_unpin(cx);
|
|
|
|
if let Poll::Ready(Some(load_stream_poll)) = poll_result {
|
|
let maybe_result = load_stream_poll.0;
|
|
let mut load = load_stream_poll.1;
|
|
let dyn_import_id = load.id;
|
|
|
|
if let Some(load_stream_result) = maybe_result {
|
|
match load_stream_result {
|
|
Ok((request, info)) => {
|
|
// A module (not necessarily the one dynamically imported) has been
|
|
// fetched. Create and register it, and if successful, poll for the
|
|
// next recursive-load event related to this dynamic import.
|
|
let register_result = load.register_and_recurse(
|
|
&mut self.handle_scope(),
|
|
&request,
|
|
info,
|
|
);
|
|
|
|
match register_result {
|
|
Ok(()) => {
|
|
// Keep importing until it's fully drained
|
|
self
|
|
.module_map
|
|
.borrow_mut()
|
|
.pending_dynamic_imports
|
|
.push(load.into_future());
|
|
}
|
|
Err(err) => {
|
|
let exception = match err {
|
|
ModuleError::Exception(e) => e,
|
|
ModuleError::Other(e) => {
|
|
to_v8_type_error(&mut self.handle_scope(), e)
|
|
}
|
|
};
|
|
self.dynamic_import_reject(dyn_import_id, exception)
|
|
}
|
|
}
|
|
}
|
|
Err(err) => {
|
|
// A non-javascript error occurred; this could be due to a an invalid
|
|
// module specifier, or a problem with the source map, or a failure
|
|
// to fetch the module source code.
|
|
let exception = to_v8_type_error(&mut self.handle_scope(), err);
|
|
self.dynamic_import_reject(dyn_import_id, exception);
|
|
}
|
|
}
|
|
} else {
|
|
// The top-level module from a dynamic import has been instantiated.
|
|
// Load is done.
|
|
let module_id =
|
|
load.root_module_id.expect("Root module should be loaded");
|
|
let result = self.instantiate_module(module_id);
|
|
if let Err(exception) = result {
|
|
self.dynamic_import_reject(dyn_import_id, exception);
|
|
}
|
|
self.dynamic_import_module_evaluate(dyn_import_id, module_id)?;
|
|
}
|
|
|
|
// Continue polling for more ready dynamic imports.
|
|
continue;
|
|
}
|
|
|
|
// There are no active dynamic import loads, or none are ready.
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
}
|
|
|
|
/// "deno_core" runs V8 with Top Level Await enabled. It means that each
|
|
/// module evaluation returns a promise from V8.
|
|
/// Feature docs: https://v8.dev/features/top-level-await
|
|
///
|
|
/// This promise resolves after all dependent modules have also
|
|
/// resolved. Each dependent module may perform calls to "import()" and APIs
|
|
/// using async ops will add futures to the runtime's event loop.
|
|
/// It means that the promise returned from module evaluation will
|
|
/// resolve only after all futures in the event loop are done.
|
|
///
|
|
/// Thus during turn of event loop we need to check if V8 has
|
|
/// resolved or rejected the promise. If the promise is still pending
|
|
/// then another turn of event loop must be performed.
|
|
fn evaluate_pending_module(&mut self) {
|
|
let maybe_module_evaluation =
|
|
self.inner.state.borrow_mut().pending_mod_evaluate.take();
|
|
|
|
if maybe_module_evaluation.is_none() {
|
|
return;
|
|
}
|
|
|
|
let mut module_evaluation = maybe_module_evaluation.unwrap();
|
|
let state_rc = self.inner.state.clone();
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let promise_global = module_evaluation.promise.clone().unwrap();
|
|
let promise = promise_global.open(scope);
|
|
let promise_state = promise.state();
|
|
|
|
match promise_state {
|
|
v8::PromiseState::Pending => {
|
|
// NOTE: `poll_event_loop` will decide if
|
|
// runtime would be woken soon
|
|
state_rc.borrow_mut().pending_mod_evaluate = Some(module_evaluation);
|
|
}
|
|
v8::PromiseState::Fulfilled => {
|
|
scope.perform_microtask_checkpoint();
|
|
// Receiver end might have been already dropped, ignore the result
|
|
let _ = module_evaluation.sender.send(Ok(()));
|
|
module_evaluation.handled_promise_rejections.clear();
|
|
}
|
|
v8::PromiseState::Rejected => {
|
|
let exception = promise.result(scope);
|
|
scope.perform_microtask_checkpoint();
|
|
|
|
// Receiver end might have been already dropped, ignore the result
|
|
if module_evaluation
|
|
.handled_promise_rejections
|
|
.contains(&promise_global)
|
|
{
|
|
let _ = module_evaluation.sender.send(Ok(()));
|
|
module_evaluation.handled_promise_rejections.clear();
|
|
} else {
|
|
let _ = module_evaluation
|
|
.sender
|
|
.send(exception_to_err_result(scope, exception, false));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Returns true if some dynamic import was resolved.
|
|
fn evaluate_dyn_imports(&mut self) -> bool {
|
|
let pending = std::mem::take(
|
|
&mut self.inner.state.borrow_mut().pending_dyn_mod_evaluate,
|
|
);
|
|
if pending.is_empty() {
|
|
return false;
|
|
}
|
|
let mut resolved_any = false;
|
|
let mut still_pending = vec![];
|
|
for pending_dyn_evaluate in pending {
|
|
let maybe_result = {
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let module_id = pending_dyn_evaluate.module_id;
|
|
let promise = pending_dyn_evaluate.promise.open(scope);
|
|
let _module = pending_dyn_evaluate.module.open(scope);
|
|
let promise_state = promise.state();
|
|
|
|
match promise_state {
|
|
v8::PromiseState::Pending => {
|
|
still_pending.push(pending_dyn_evaluate);
|
|
None
|
|
}
|
|
v8::PromiseState::Fulfilled => {
|
|
Some(Ok((pending_dyn_evaluate.load_id, module_id)))
|
|
}
|
|
v8::PromiseState::Rejected => {
|
|
let exception = promise.result(scope);
|
|
let exception = v8::Global::new(scope, exception);
|
|
Some(Err((pending_dyn_evaluate.load_id, exception)))
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(result) = maybe_result {
|
|
resolved_any = true;
|
|
match result {
|
|
Ok((dyn_import_id, module_id)) => {
|
|
self.dynamic_import_resolve(dyn_import_id, module_id);
|
|
}
|
|
Err((dyn_import_id, exception)) => {
|
|
self.dynamic_import_reject(dyn_import_id, exception);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
self.inner.state.borrow_mut().pending_dyn_mod_evaluate = still_pending;
|
|
resolved_any
|
|
}
|
|
|
|
/// Asynchronously load specified module and all of its dependencies.
|
|
///
|
|
/// The module will be marked as "main", and because of that
|
|
/// "import.meta.main" will return true when checked inside that module.
|
|
///
|
|
/// User must call [`JsRuntime::mod_evaluate`] with returned `ModuleId`
|
|
/// manually after load is finished.
|
|
pub async fn load_main_module(
|
|
&mut self,
|
|
specifier: &ModuleSpecifier,
|
|
code: Option<ModuleCode>,
|
|
) -> Result<ModuleId, Error> {
|
|
let module_map_rc = self.module_map.clone();
|
|
if let Some(code) = code {
|
|
let specifier = specifier.as_str().to_owned().into();
|
|
let scope = &mut self.handle_scope();
|
|
// true for main module
|
|
module_map_rc
|
|
.borrow_mut()
|
|
.new_es_module(scope, true, specifier, code, false)
|
|
.map_err(|e| match e {
|
|
ModuleError::Exception(exception) => {
|
|
let exception = v8::Local::new(scope, exception);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
}
|
|
ModuleError::Other(error) => error,
|
|
})?;
|
|
}
|
|
|
|
let mut load =
|
|
ModuleMap::load_main(module_map_rc.clone(), &specifier).await?;
|
|
|
|
while let Some(load_result) = load.next().await {
|
|
let (request, info) = load_result?;
|
|
let scope = &mut self.handle_scope();
|
|
load.register_and_recurse(scope, &request, info).map_err(
|
|
|e| match e {
|
|
ModuleError::Exception(exception) => {
|
|
let exception = v8::Local::new(scope, exception);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
}
|
|
ModuleError::Other(error) => error,
|
|
},
|
|
)?;
|
|
}
|
|
|
|
let root_id = load.root_module_id.expect("Root module should be loaded");
|
|
self.instantiate_module(root_id).map_err(|e| {
|
|
let scope = &mut self.handle_scope();
|
|
let exception = v8::Local::new(scope, e);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
})?;
|
|
Ok(root_id)
|
|
}
|
|
|
|
/// Asynchronously load specified ES module and all of its dependencies.
|
|
///
|
|
/// This method is meant to be used when loading some utility code that
|
|
/// might be later imported by the main module (ie. an entry point module).
|
|
///
|
|
/// User must call [`JsRuntime::mod_evaluate`] with returned `ModuleId`
|
|
/// manually after load is finished.
|
|
pub async fn load_side_module(
|
|
&mut self,
|
|
specifier: &ModuleSpecifier,
|
|
code: Option<ModuleCode>,
|
|
) -> Result<ModuleId, Error> {
|
|
let module_map_rc = self.module_map.clone();
|
|
if let Some(code) = code {
|
|
let specifier = specifier.as_str().to_owned().into();
|
|
let scope = &mut self.handle_scope();
|
|
// false for side module (not main module)
|
|
module_map_rc
|
|
.borrow_mut()
|
|
.new_es_module(scope, false, specifier, code, false)
|
|
.map_err(|e| match e {
|
|
ModuleError::Exception(exception) => {
|
|
let exception = v8::Local::new(scope, exception);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
}
|
|
ModuleError::Other(error) => error,
|
|
})?;
|
|
}
|
|
|
|
let mut load =
|
|
ModuleMap::load_side(module_map_rc.clone(), &specifier).await?;
|
|
|
|
while let Some(load_result) = load.next().await {
|
|
let (request, info) = load_result?;
|
|
let scope = &mut self.handle_scope();
|
|
load.register_and_recurse(scope, &request, info).map_err(
|
|
|e| match e {
|
|
ModuleError::Exception(exception) => {
|
|
let exception = v8::Local::new(scope, exception);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
}
|
|
ModuleError::Other(error) => error,
|
|
},
|
|
)?;
|
|
}
|
|
|
|
let root_id = load.root_module_id.expect("Root module should be loaded");
|
|
self.instantiate_module(root_id).map_err(|e| {
|
|
let scope = &mut self.handle_scope();
|
|
let exception = v8::Local::new(scope, e);
|
|
exception_to_err_result::<()>(scope, exception, false).unwrap_err()
|
|
})?;
|
|
Ok(root_id)
|
|
}
|
|
|
|
fn check_promise_rejections(&mut self) -> Result<(), Error> {
|
|
let state = self.inner.state.clone();
|
|
let scope = &mut self.handle_scope();
|
|
let state = state.borrow();
|
|
for realm in &state.known_realms {
|
|
realm.check_promise_rejections(scope)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
// Polls pending ops and then runs `Deno.core.eventLoopTick` callback.
|
|
fn do_js_event_loop_tick(&mut self, cx: &mut Context) -> Result<(), Error> {
|
|
// Handle responses for each realm.
|
|
let state = self.inner.state.clone();
|
|
let isolate = &mut self.inner.v8_isolate;
|
|
let realm_count = state.borrow().known_realms.len();
|
|
for realm_idx in 0..realm_count {
|
|
let realm = state.borrow().known_realms.get(realm_idx).unwrap().clone();
|
|
let context_state = realm.state();
|
|
let mut context_state = context_state.borrow_mut();
|
|
let scope = &mut realm.handle_scope(isolate);
|
|
|
|
// We return async responses to JS in unbounded batches (may change),
|
|
// each batch is a flat vector of tuples:
|
|
// `[promise_id1, op_result1, promise_id2, op_result2, ...]`
|
|
// promise_id is a simple integer, op_result is an ops::OpResult
|
|
// which contains a value OR an error, encoded as a tuple.
|
|
// This batch is received in JS via the special `arguments` variable
|
|
// and then each tuple is used to resolve or reject promises
|
|
//
|
|
// This can handle 15 promises futures in a single batch without heap
|
|
// allocations.
|
|
let mut args: SmallVec<[v8::Local<v8::Value>; 32]> =
|
|
SmallVec::with_capacity(32);
|
|
|
|
loop {
|
|
let item = {
|
|
let next = std::pin::pin!(context_state.pending_ops.join_next());
|
|
let Poll::Ready(Some(item)) = next.poll(cx) else {
|
|
break;
|
|
};
|
|
item
|
|
};
|
|
let (promise_id, op_id, mut resp) = item.unwrap().into_inner();
|
|
state
|
|
.borrow()
|
|
.op_state
|
|
.borrow()
|
|
.tracker
|
|
.track_async_completed(op_id);
|
|
context_state.unrefed_ops.remove(&promise_id);
|
|
args.push(v8::Integer::new(scope, promise_id).into());
|
|
args.push(match resp.to_v8(scope) {
|
|
Ok(v) => v,
|
|
Err(e) => OpResult::Err(OpError::new(&|_| "TypeError", e.into()))
|
|
.to_v8(scope)
|
|
.unwrap(),
|
|
});
|
|
}
|
|
|
|
let has_tick_scheduled =
|
|
v8::Boolean::new(scope, self.inner.state.borrow().has_tick_scheduled);
|
|
args.push(has_tick_scheduled.into());
|
|
|
|
let js_event_loop_tick_cb_handle =
|
|
context_state.js_event_loop_tick_cb.clone().unwrap();
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
let js_event_loop_tick_cb = js_event_loop_tick_cb_handle.open(tc_scope);
|
|
let this = v8::undefined(tc_scope).into();
|
|
drop(context_state);
|
|
js_event_loop_tick_cb.call(tc_scope, this, args.as_slice());
|
|
|
|
if let Some(exception) = tc_scope.exception() {
|
|
// TODO(@andreubotella): Returning here can cause async ops in other
|
|
// realms to never resolve.
|
|
return exception_to_err_result(tc_scope, exception, false);
|
|
}
|
|
|
|
if tc_scope.has_terminated() || tc_scope.is_execution_terminating() {
|
|
return Ok(());
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|