mirror of
https://github.com/denoland/deno.git
synced 2024-11-29 16:30:56 -05:00
10e50a1207
This speeds up incremental rebuild when only touching JS files by 13-15% Rebuild time after `touch 01_broadcast_channel.js`: main: run 1 49.18s, run 2 50.34s this: run 1 43.12s, run 2 43.19s
1976 lines
61 KiB
Rust
1976 lines
61 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use rusty_v8 as v8;
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use crate::bindings;
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use crate::error::attach_handle_to_error;
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use crate::error::generic_error;
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use crate::error::AnyError;
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use crate::error::ErrWithV8Handle;
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use crate::error::JsError;
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use crate::inspector::JsRuntimeInspector;
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use crate::module_specifier::ModuleSpecifier;
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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::modules::NoopModuleLoader;
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use crate::ops::*;
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use crate::Extension;
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use crate::OpMiddlewareFn;
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use crate::OpPayload;
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use crate::OpResult;
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use crate::OpState;
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use crate::PromiseId;
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use futures::channel::mpsc;
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use futures::future::poll_fn;
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use futures::future::FutureExt;
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use futures::stream::FuturesUnordered;
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use futures::stream::StreamExt;
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use futures::task::AtomicWaker;
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use futures::Future;
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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::collections::VecDeque;
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use std::convert::TryFrom;
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use std::ffi::c_void;
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use std::mem::forget;
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use std::option::Option;
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use std::pin::Pin;
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use std::rc::Rc;
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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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type PendingOpFuture = Pin<Box<dyn Future<Output = (PromiseId, OpResult)>>>;
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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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pub type JsErrorCreateFn = dyn Fn(JsError) -> AnyError;
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pub type GetErrorClassFn =
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&'static dyn for<'e> Fn(&'e AnyError) -> &'static str;
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/// Objects that need to live as long as the isolate
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#[derive(Default)]
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struct IsolateAllocations {
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near_heap_limit_callback_data:
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Option<(Box<RefCell<dyn Any>>, v8::NearHeapLimitCallback)>,
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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. A JsRuntime is a Future that can be used with
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/// an event loop (Tokio, async_std).
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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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/// Pending ops are created in JavaScript by calling Deno.core.opAsync(), and in Rust
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/// by implementing an async function that takes a serde::Deserialize "control argument"
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/// and an optional zero copy buffer, each async Op is tied to a Promise in JavaScript.
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pub struct JsRuntime {
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// This is an Option<OwnedIsolate> instead of just OwnedIsolate to workaround
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// an safety issue with SnapshotCreator. See JsRuntime::drop.
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v8_isolate: Option<v8::OwnedIsolate>,
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inspector: Option<Box<JsRuntimeInspector>>,
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snapshot_creator: Option<v8::SnapshotCreator>,
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has_snapshotted: bool,
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allocations: IsolateAllocations,
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extensions: Vec<Extension>,
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}
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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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struct ModEvaluate {
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promise: v8::Global<v8::Promise>,
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sender: mpsc::Sender<Result<(), AnyError>>,
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}
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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(crate) struct JsRuntimeState {
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pub global_context: Option<v8::Global<v8::Context>>,
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pub(crate) js_recv_cb: Option<v8::Global<v8::Function>>,
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pub(crate) js_macrotask_cb: Option<v8::Global<v8::Function>>,
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pub(crate) pending_promise_exceptions:
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HashMap<v8::Global<v8::Promise>, v8::Global<v8::Value>>,
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pending_dyn_mod_evaluate: VecDeque<DynImportModEvaluate>,
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pending_mod_evaluate: Option<ModEvaluate>,
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pub(crate) js_error_create_fn: Rc<JsErrorCreateFn>,
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pub(crate) pending_ops: FuturesUnordered<PendingOpFuture>,
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pub(crate) pending_unref_ops: FuturesUnordered<PendingOpFuture>,
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pub(crate) have_unpolled_ops: bool,
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pub(crate) op_state: Rc<RefCell<OpState>>,
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waker: AtomicWaker,
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}
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impl Drop for JsRuntime {
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fn drop(&mut self) {
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// The Isolate object must outlive the Inspector object, but this is
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// currently not enforced by the type system.
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self.inspector.take();
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if let Some(creator) = self.snapshot_creator.take() {
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// TODO(ry): in rusty_v8, `SnapShotCreator::get_owned_isolate()` returns
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// a `struct OwnedIsolate` which is not actually owned, hence the need
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// here to leak the `OwnedIsolate` in order to avoid a double free and
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// the segfault that it causes.
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let v8_isolate = self.v8_isolate.take().unwrap();
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forget(v8_isolate);
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// TODO(ry) V8 has a strange assert which prevents a SnapshotCreator from
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// being deallocated if it hasn't created a snapshot yet.
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// https://github.com/v8/v8/blob/73212783fbd534fac76cc4b66aac899c13f71fc8/src/api.cc#L603
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// If that assert is removed, this if guard could be removed.
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// WARNING: There may be false positive LSAN errors here.
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if self.has_snapshotted {
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drop(creator);
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}
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}
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}
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}
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fn v8_init(v8_platform: Option<v8::UniquePtr<v8::Platform>>) {
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// Include 10MB ICU data file.
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#[repr(C, align(16))]
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struct IcuData([u8; 10413584]);
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static ICU_DATA: IcuData = IcuData(*include_bytes!("icudtl.dat"));
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v8::icu::set_common_data(&ICU_DATA.0).unwrap();
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let v8_platform = v8_platform
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.unwrap_or_else(v8::new_default_platform)
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.unwrap();
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v8::V8::initialize_platform(v8_platform);
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v8::V8::initialize();
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let flags = concat!(
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// TODO(ry) This makes WASM compile synchronously. Eventually we should
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// remove this to make it work asynchronously too. But that requires getting
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// PumpMessageLoop and RunMicrotasks setup correctly.
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// See https://github.com/denoland/deno/issues/2544
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" --experimental-wasm-threads",
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" --no-wasm-async-compilation",
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" --harmony-top-level-await",
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" --harmony-import-assertions",
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" --no-validate-asm",
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);
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v8::V8::set_flags_from_string(flags);
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}
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#[derive(Default)]
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pub struct RuntimeOptions {
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/// Allows a callback to be set whenever a V8 exception is made. This allows
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/// the caller to wrap the JsError into an error. By default this callback
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/// is set to `JsError::create()`.
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pub js_error_create_fn: Option<Rc<JsErrorCreateFn>>,
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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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/// these are sets of ops and other JS code to be initialized.
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pub extensions: Vec<Extension>,
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/// V8 snapshot that should be loaded on startup.
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///
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/// Currently can't be used with `will_snapshot`.
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pub startup_snapshot: Option<Snapshot>,
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/// Prepare runtime to take snapshot of loaded code.
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///
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/// Currently can't be used with `startup_snapshot`.
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pub will_snapshot: bool,
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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::UniquePtr<v8::Platform>>,
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/// Create a V8 inspector and attach to the runtime.
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pub attach_inspector: bool,
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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) -> Self {
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let v8_platform = options.v8_platform.take();
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static DENO_INIT: Once = Once::new();
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DENO_INIT.call_once(move || v8_init(v8_platform));
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let has_startup_snapshot = options.startup_snapshot.is_some();
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let global_context;
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let (mut isolate, maybe_snapshot_creator) = if options.will_snapshot {
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// TODO(ry) Support loading snapshots before snapshotting.
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assert!(options.startup_snapshot.is_none());
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let mut creator =
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v8::SnapshotCreator::new(Some(&bindings::EXTERNAL_REFERENCES));
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let isolate = unsafe { creator.get_owned_isolate() };
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let mut isolate = JsRuntime::setup_isolate(isolate);
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{
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let scope = &mut v8::HandleScope::new(&mut isolate);
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let context = bindings::initialize_context(scope);
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global_context = v8::Global::new(scope, context);
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creator.set_default_context(context);
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}
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(isolate, Some(creator))
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} else {
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let mut params = options
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.create_params
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.take()
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.unwrap_or_else(v8::Isolate::create_params)
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.external_references(&**bindings::EXTERNAL_REFERENCES);
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let snapshot_loaded = if let Some(snapshot) = options.startup_snapshot {
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params = match snapshot {
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Snapshot::Static(data) => params.snapshot_blob(data),
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Snapshot::JustCreated(data) => params.snapshot_blob(data),
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Snapshot::Boxed(data) => params.snapshot_blob(data),
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};
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true
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} else {
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false
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};
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let isolate = v8::Isolate::new(params);
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let mut isolate = JsRuntime::setup_isolate(isolate);
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{
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let scope = &mut v8::HandleScope::new(&mut isolate);
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let context = if snapshot_loaded {
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v8::Context::new(scope)
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} else {
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// If no snapshot is provided, we initialize the context with empty
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// main source code and source maps.
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bindings::initialize_context(scope)
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};
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global_context = v8::Global::new(scope, context);
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}
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(isolate, None)
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};
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let maybe_inspector = if options.attach_inspector {
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let inspector =
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JsRuntimeInspector::new(&mut isolate, global_context.clone());
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Some(inspector)
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} else {
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None
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};
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let loader = options
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.module_loader
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.unwrap_or_else(|| Rc::new(NoopModuleLoader));
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let js_error_create_fn = options
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.js_error_create_fn
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.unwrap_or_else(|| Rc::new(JsError::create));
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let mut op_state = OpState::new();
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if let Some(get_error_class_fn) = options.get_error_class_fn {
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op_state.get_error_class_fn = get_error_class_fn;
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}
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let op_state = Rc::new(RefCell::new(op_state));
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isolate.set_slot(Rc::new(RefCell::new(JsRuntimeState {
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global_context: Some(global_context),
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pending_promise_exceptions: HashMap::new(),
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pending_dyn_mod_evaluate: VecDeque::new(),
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pending_mod_evaluate: None,
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js_recv_cb: None,
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js_macrotask_cb: None,
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js_error_create_fn,
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pending_ops: FuturesUnordered::new(),
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pending_unref_ops: FuturesUnordered::new(),
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op_state: op_state.clone(),
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have_unpolled_ops: false,
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waker: AtomicWaker::new(),
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})));
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let module_map = ModuleMap::new(loader, op_state);
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isolate.set_slot(Rc::new(RefCell::new(module_map)));
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// Add builtins extension
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options
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.extensions
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.insert(0, crate::ops_builtin::init_builtins());
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let mut js_runtime = Self {
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v8_isolate: Some(isolate),
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inspector: maybe_inspector,
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snapshot_creator: maybe_snapshot_creator,
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has_snapshotted: false,
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allocations: IsolateAllocations::default(),
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extensions: options.extensions,
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};
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// TODO(@AaronO): diff extensions inited in snapshot and those provided
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// for now we assume that snapshot and extensions always match
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if !has_startup_snapshot {
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js_runtime.init_extension_js().unwrap();
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}
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// Init extension ops
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js_runtime.init_extension_ops().unwrap();
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js_runtime.sync_ops_cache();
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// Init async ops callback
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js_runtime.init_recv_cb();
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js_runtime
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}
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pub fn global_context(&mut self) -> v8::Global<v8::Context> {
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let state = Self::state(self.v8_isolate());
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let state = state.borrow();
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state.global_context.clone().unwrap()
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}
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pub fn v8_isolate(&mut self) -> &mut v8::OwnedIsolate {
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self.v8_isolate.as_mut().unwrap()
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}
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pub fn inspector(&mut self) -> Option<&mut Box<JsRuntimeInspector>> {
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self.inspector.as_mut()
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}
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pub fn handle_scope(&mut self) -> v8::HandleScope {
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let context = self.global_context();
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v8::HandleScope::with_context(self.v8_isolate(), context)
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}
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fn setup_isolate(mut isolate: v8::OwnedIsolate) -> v8::OwnedIsolate {
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isolate.set_capture_stack_trace_for_uncaught_exceptions(true, 10);
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isolate.set_promise_reject_callback(bindings::promise_reject_callback);
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isolate.set_host_initialize_import_meta_object_callback(
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bindings::host_initialize_import_meta_object_callback,
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);
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isolate.set_host_import_module_dynamically_callback(
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bindings::host_import_module_dynamically_callback,
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);
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isolate
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}
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pub(crate) fn state(isolate: &v8::Isolate) -> Rc<RefCell<JsRuntimeState>> {
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let s = isolate.get_slot::<Rc<RefCell<JsRuntimeState>>>().unwrap();
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s.clone()
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}
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pub(crate) fn module_map(isolate: &v8::Isolate) -> Rc<RefCell<ModuleMap>> {
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let module_map = isolate.get_slot::<Rc<RefCell<ModuleMap>>>().unwrap();
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module_map.clone()
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}
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/// Initializes JS of provided Extensions
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fn init_extension_js(&mut self) -> Result<(), AnyError> {
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// Take extensions to avoid double-borrow
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let mut extensions: Vec<Extension> = std::mem::take(&mut self.extensions);
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for m in extensions.iter_mut() {
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let js_files = m.init_js();
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for (filename, source) in js_files {
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let source = source()?;
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// TODO(@AaronO): use JsRuntime::execute_static() here to move src off heap
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self.execute(filename, &source)?;
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}
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}
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// Restore extensions
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self.extensions = extensions;
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Ok(())
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}
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/// Initializes ops of provided Extensions
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fn init_extension_ops(&mut self) -> Result<(), AnyError> {
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let op_state = self.op_state();
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// Take extensions to avoid double-borrow
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let mut extensions: Vec<Extension> = std::mem::take(&mut self.extensions);
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// Middleware
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let middleware: Vec<Box<OpMiddlewareFn>> = extensions
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.iter_mut()
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.filter_map(|e| e.init_middleware())
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.collect();
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// macroware wraps an opfn in all the middleware
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let macroware =
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move |name, opfn| middleware.iter().fold(opfn, |opfn, m| m(name, opfn));
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// Register ops
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for e in extensions.iter_mut() {
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e.init_state(&mut op_state.borrow_mut())?;
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// Register each op after middlewaring it
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let ops = e.init_ops().unwrap_or_default();
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for (name, opfn) in ops {
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self.register_op(name, macroware(name, opfn));
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}
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}
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// Sync ops cache
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self.sync_ops_cache();
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// Restore extensions
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self.extensions = extensions;
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Ok(())
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}
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/// Grabs a reference to core.js' handleAsyncMsgFromRust
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fn init_recv_cb(&mut self) {
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let scope = &mut self.handle_scope();
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// Get Deno.core.handleAsyncMsgFromRust
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let code =
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v8::String::new(scope, "Deno.core.handleAsyncMsgFromRust").unwrap();
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let script = v8::Script::compile(scope, code, None).unwrap();
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let v8_value = script.run(scope).unwrap();
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// Put global handle in state.js_recv_cb
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let state_rc = JsRuntime::state(scope);
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let mut state = state_rc.borrow_mut();
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let cb = v8::Local::<v8::Function>::try_from(v8_value).unwrap();
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state.js_recv_cb.replace(v8::Global::new(scope, cb));
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}
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/// Ensures core.js has the latest op-name to op-id mappings
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pub fn sync_ops_cache(&mut self) {
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self.execute("<anon>", "Deno.core.syncOpsCache()").unwrap()
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}
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/// Returns the runtime's op state, which can be used to maintain ops
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/// and access resources between op calls.
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pub fn op_state(&mut self) -> Rc<RefCell<OpState>> {
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let state_rc = Self::state(self.v8_isolate());
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let state = state_rc.borrow();
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state.op_state.clone()
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}
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/// Executes traditional JavaScript code (traditional = not ES modules)
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///
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/// The execution takes place on the current global context, so it is possible
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/// to maintain local JS state and invoke this method multiple times.
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///
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/// `AnyError` can be downcast to a type that exposes additional information
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/// about the V8 exception. By default this type is `JsError`, however it may
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/// be a different type if `RuntimeOptions::js_error_create_fn` has been set.
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pub fn execute(
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&mut self,
|
|
js_filename: &str,
|
|
js_source: &str,
|
|
) -> Result<(), AnyError> {
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let source = v8::String::new(scope, js_source).unwrap();
|
|
let name = v8::String::new(scope, js_filename).unwrap();
|
|
let origin = bindings::script_origin(scope, name);
|
|
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
|
|
let script = match v8::Script::compile(tc_scope, source, Some(&origin)) {
|
|
Some(script) => script,
|
|
None => {
|
|
let exception = tc_scope.exception().unwrap();
|
|
return exception_to_err_result(tc_scope, exception, false);
|
|
}
|
|
};
|
|
|
|
match script.run(tc_scope) {
|
|
Some(_) => Ok(()),
|
|
None => {
|
|
assert!(tc_scope.has_caught());
|
|
let exception = tc_scope.exception().unwrap();
|
|
exception_to_err_result(tc_scope, exception, false)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Takes a snapshot. The isolate should have been created with will_snapshot
|
|
/// set to true.
|
|
///
|
|
/// `AnyError` can be downcast to a type that exposes additional information
|
|
/// about the V8 exception. By default this type is `JsError`, however it may
|
|
/// be a different type if `RuntimeOptions::js_error_create_fn` has been set.
|
|
pub fn snapshot(&mut self) -> v8::StartupData {
|
|
assert!(self.snapshot_creator.is_some());
|
|
let state = Self::state(self.v8_isolate());
|
|
|
|
// Note: create_blob() method must not be called from within a HandleScope.
|
|
// TODO(piscisaureus): The rusty_v8 type system should enforce this.
|
|
state.borrow_mut().global_context.take();
|
|
|
|
// Overwrite existing ModuleMap to drop v8::Global handles
|
|
self
|
|
.v8_isolate()
|
|
.set_slot(Rc::new(RefCell::new(ModuleMap::new(
|
|
Rc::new(NoopModuleLoader),
|
|
state.borrow().op_state.clone(),
|
|
))));
|
|
// Drop other v8::Global handles before snapshotting
|
|
std::mem::take(&mut state.borrow_mut().js_recv_cb);
|
|
|
|
let snapshot_creator = self.snapshot_creator.as_mut().unwrap();
|
|
let snapshot = snapshot_creator
|
|
.create_blob(v8::FunctionCodeHandling::Keep)
|
|
.unwrap();
|
|
self.has_snapshotted = true;
|
|
|
|
snapshot
|
|
}
|
|
|
|
/// Registers an op that can be called from JavaScript.
|
|
///
|
|
/// The _op_ mechanism allows to expose Rust functions to the JS runtime,
|
|
/// which can be called using the provided `name`.
|
|
///
|
|
/// This function provides byte-level bindings. To pass data via JSON, the
|
|
/// following functions can be passed as an argument for `op_fn`:
|
|
/// * [op_sync()](fn.op_sync.html)
|
|
/// * [op_async()](fn.op_async.html)
|
|
pub fn register_op<F>(&mut self, name: &str, op_fn: F) -> OpId
|
|
where
|
|
F: Fn(Rc<RefCell<OpState>>, OpPayload) -> Op + 'static,
|
|
{
|
|
Self::state(self.v8_isolate())
|
|
.borrow_mut()
|
|
.op_state
|
|
.borrow_mut()
|
|
.op_table
|
|
.register_op(name, op_fn)
|
|
}
|
|
|
|
/// 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);
|
|
}
|
|
}
|
|
|
|
/// 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<(), AnyError> {
|
|
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<(), AnyError>> {
|
|
// We always poll the inspector if it exists.
|
|
let _ = self.inspector().map(|i| i.poll_unpin(cx));
|
|
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
{
|
|
let state = state_rc.borrow();
|
|
state.waker.register(cx.waker());
|
|
}
|
|
|
|
// Ops
|
|
{
|
|
let async_responses = self.poll_pending_ops(cx);
|
|
self.async_op_response(async_responses)?;
|
|
self.drain_macrotasks()?;
|
|
self.check_promise_exceptions()?;
|
|
}
|
|
|
|
// Dynamic module loading - ie. modules loaded using "import()"
|
|
{
|
|
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());
|
|
|
|
self.evaluate_dyn_imports();
|
|
|
|
self.check_promise_exceptions()?;
|
|
}
|
|
|
|
// Top level module
|
|
self.evaluate_pending_module();
|
|
|
|
let state = state_rc.borrow();
|
|
let module_map = module_map_rc.borrow();
|
|
|
|
let has_pending_ops = !state.pending_ops.is_empty();
|
|
|
|
let has_pending_dyn_imports = module_map.has_pending_dynamic_imports();
|
|
let has_pending_dyn_module_evaluation =
|
|
!state.pending_dyn_mod_evaluate.is_empty();
|
|
let has_pending_module_evaluation = state.pending_mod_evaluate.is_some();
|
|
let inspector_has_active_sessions = self
|
|
.inspector
|
|
.as_ref()
|
|
.map(|i| i.has_active_sessions())
|
|
.unwrap_or(false);
|
|
|
|
if !has_pending_ops
|
|
&& !has_pending_dyn_imports
|
|
&& !has_pending_dyn_module_evaluation
|
|
&& !has_pending_module_evaluation
|
|
{
|
|
if wait_for_inspector && inspector_has_active_sessions {
|
|
return Poll::Pending;
|
|
}
|
|
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
// Check if more async ops have been dispatched
|
|
// during this turn of event loop.
|
|
if state.have_unpolled_ops {
|
|
state.waker.wake();
|
|
}
|
|
|
|
if has_pending_module_evaluation {
|
|
if has_pending_ops
|
|
|| has_pending_dyn_imports
|
|
|| has_pending_dyn_module_evaluation
|
|
{
|
|
// pass, will be polled again
|
|
} else {
|
|
let msg = "Module evaluation is still pending but there are no pending ops or dynamic imports. This situation is often caused by unresolved promise.";
|
|
return Poll::Ready(Err(generic_error(msg)));
|
|
}
|
|
}
|
|
|
|
if has_pending_dyn_module_evaluation {
|
|
if has_pending_ops || has_pending_dyn_imports {
|
|
// pass, will be polled again
|
|
} else {
|
|
let mut msg = "Dynamically imported module evaluation is still pending but there are no pending ops. This situation is often caused by unresolved promise.
|
|
Pending dynamic modules:\n".to_string();
|
|
for pending_evaluate in &state.pending_dyn_mod_evaluate {
|
|
let module_info = module_map
|
|
.get_info_by_id(&pending_evaluate.module_id)
|
|
.unwrap();
|
|
msg.push_str(&format!("- {}", module_info.name.as_str()));
|
|
}
|
|
return Poll::Ready(Err(generic_error(msg)));
|
|
}
|
|
}
|
|
|
|
Poll::Pending
|
|
}
|
|
}
|
|
|
|
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,
|
|
{
|
|
let callback = unsafe { &mut *(data as *mut F) };
|
|
callback(current_heap_limit, initial_heap_limit)
|
|
}
|
|
|
|
impl JsRuntimeState {
|
|
/// 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.waker.wake();
|
|
}
|
|
}
|
|
|
|
pub(crate) fn exception_to_err_result<'s, T>(
|
|
scope: &mut v8::HandleScope<'s>,
|
|
exception: v8::Local<v8::Value>,
|
|
in_promise: bool,
|
|
) -> Result<T, AnyError> {
|
|
let is_terminating_exception = scope.is_execution_terminating();
|
|
let mut exception = exception;
|
|
|
|
if is_terminating_exception {
|
|
// TerminateExecution was called. Cancel exception termination so that the
|
|
// exception can be created..
|
|
scope.cancel_terminate_execution();
|
|
|
|
// Maybe make a new exception object.
|
|
if exception.is_null_or_undefined() {
|
|
let message = v8::String::new(scope, "execution terminated").unwrap();
|
|
exception = v8::Exception::error(scope, message);
|
|
}
|
|
}
|
|
|
|
let mut js_error = JsError::from_v8_exception(scope, exception);
|
|
if in_promise {
|
|
js_error.message = format!(
|
|
"Uncaught (in promise) {}",
|
|
js_error.message.trim_start_matches("Uncaught ")
|
|
);
|
|
}
|
|
|
|
let state_rc = JsRuntime::state(scope);
|
|
let state = state_rc.borrow();
|
|
let js_error = (state.js_error_create_fn)(js_error);
|
|
|
|
if is_terminating_exception {
|
|
// Re-enable exception termination.
|
|
scope.terminate_execution();
|
|
}
|
|
|
|
Err(js_error)
|
|
}
|
|
|
|
// Related to module loading
|
|
impl JsRuntime {
|
|
pub(crate) fn instantiate_module(
|
|
&mut self,
|
|
id: ModuleId,
|
|
) -> Result<(), AnyError> {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
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");
|
|
|
|
if module.get_status() == v8::ModuleStatus::Errored {
|
|
let exception = module.get_exception();
|
|
let err = exception_to_err_result(tc_scope, exception, false)
|
|
.map_err(|err| attach_handle_to_error(tc_scope, err, exception));
|
|
return err;
|
|
}
|
|
|
|
// IMPORTANT: No borrows to `ModuleMap` can be held at this point because
|
|
// `module_resolve_callback` will be calling into `ModuleMap` from within
|
|
// the isolate.
|
|
let instantiate_result =
|
|
module.instantiate_module(tc_scope, bindings::module_resolve_callback);
|
|
|
|
if instantiate_result.is_none() {
|
|
let exception = tc_scope.exception().unwrap();
|
|
let err = exception_to_err_result(tc_scope, exception, false)
|
|
.map_err(|err| attach_handle_to_error(tc_scope, err, exception));
|
|
return err;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn dynamic_import_module_evaluate(
|
|
&mut self,
|
|
load_id: ModuleLoadId,
|
|
id: ModuleId,
|
|
) -> Result<(), AnyError> {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
|
|
let module_handle = module_map_rc
|
|
.borrow()
|
|
.get_handle(id)
|
|
.expect("ModuleInfo not found");
|
|
|
|
let status = {
|
|
let scope = &mut self.handle_scope();
|
|
let module = module_handle.get(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 scope = &mut self.handle_scope();
|
|
let module = v8::Local::new(scope, &module_handle);
|
|
let maybe_value = module.evaluate(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 = |_scope: &mut v8::HandleScope,
|
|
_args: v8::FunctionCallbackArguments,
|
|
_rv: v8::ReturnValue| {};
|
|
let empty_fn = v8::FunctionTemplate::new(scope, empty_fn);
|
|
let empty_fn = empty_fn.get_function(scope).unwrap();
|
|
promise.catch(scope, empty_fn);
|
|
let mut state = state_rc.borrow_mut();
|
|
let promise_global = v8::Global::new(scope, promise);
|
|
let module_global = v8::Global::new(scope, module);
|
|
|
|
let dyn_import_mod_evaluate = DynImportModEvaluate {
|
|
load_id,
|
|
module_id: id,
|
|
promise: promise_global,
|
|
module: module_global,
|
|
};
|
|
|
|
state
|
|
.pending_dyn_mod_evaluate
|
|
.push_back(dyn_import_mod_evaluate);
|
|
} 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 `run_event_loop()` to drive module
|
|
/// evaluation future.
|
|
///
|
|
/// `AnyError` can be downcast to a type that exposes additional information
|
|
/// about the V8 exception. By default this type is `JsError`, however it may
|
|
/// be a different type if `RuntimeOptions::js_error_create_fn` has been set.
|
|
///
|
|
/// This function panics if module has not been instantiated.
|
|
pub fn mod_evaluate(
|
|
&mut self,
|
|
id: ModuleId,
|
|
) -> mpsc::Receiver<Result<(), AnyError>> {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let module = module_map_rc
|
|
.borrow()
|
|
.get_handle(id)
|
|
.map(|handle| v8::Local::new(scope, handle))
|
|
.expect("ModuleInfo not found");
|
|
let mut status = module.get_status();
|
|
assert_eq!(status, v8::ModuleStatus::Instantiated);
|
|
|
|
let (sender, receiver) = mpsc::channel(1);
|
|
|
|
// 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 maybe_value = module.evaluate(scope);
|
|
|
|
// Update status after evaluating.
|
|
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 promise_global = v8::Global::new(scope, promise);
|
|
let mut state = state_rc.borrow_mut();
|
|
state.pending_promise_exceptions.remove(&promise_global);
|
|
let promise_global = v8::Global::new(scope, promise);
|
|
assert!(
|
|
state.pending_mod_evaluate.is_none(),
|
|
"There is already pending top level module evaluation"
|
|
);
|
|
|
|
state.pending_mod_evaluate = Some(ModEvaluate {
|
|
promise: promise_global,
|
|
sender,
|
|
});
|
|
scope.perform_microtask_checkpoint();
|
|
} else {
|
|
assert!(status == v8::ModuleStatus::Errored);
|
|
}
|
|
|
|
receiver
|
|
}
|
|
|
|
fn dynamic_import_reject(&mut self, id: ModuleLoadId, err: AnyError) {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
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.get(scope);
|
|
|
|
let exception = err
|
|
.downcast_ref::<ErrWithV8Handle>()
|
|
.map(|err| err.get_handle(scope))
|
|
.unwrap_or_else(|| {
|
|
let message = err.to_string();
|
|
let message = v8::String::new(scope, &message).unwrap();
|
|
v8::Exception::type_error(scope, message)
|
|
});
|
|
|
|
// 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.
|
|
resolver.reject(scope, exception).unwrap();
|
|
scope.perform_microtask_checkpoint();
|
|
}
|
|
|
|
fn dynamic_import_resolve(&mut self, id: ModuleLoadId, mod_id: ModuleId) {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
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.get(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();
|
|
scope.perform_microtask_checkpoint();
|
|
}
|
|
|
|
fn prepare_dyn_imports(
|
|
&mut self,
|
|
cx: &mut Context,
|
|
) -> Poll<Result<(), AnyError>> {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
|
|
if module_map_rc.borrow().preparing_dynamic_imports.is_empty() {
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
loop {
|
|
let poll_result = module_map_rc
|
|
.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) => {
|
|
module_map_rc
|
|
.borrow_mut()
|
|
.pending_dynamic_imports
|
|
.push(load.into_future());
|
|
}
|
|
Err(err) => {
|
|
self.dynamic_import_reject(dyn_import_id, err);
|
|
}
|
|
}
|
|
// 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<(), AnyError>> {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
|
|
if module_map_rc.borrow().pending_dynamic_imports.is_empty() {
|
|
return Poll::Ready(Ok(()));
|
|
}
|
|
|
|
loop {
|
|
let poll_result = module_map_rc
|
|
.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(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 =
|
|
module_map_rc.borrow_mut().register_during_load(
|
|
&mut self.handle_scope(),
|
|
info,
|
|
&mut load,
|
|
);
|
|
|
|
match register_result {
|
|
Ok(()) => {
|
|
// Keep importing until it's fully drained
|
|
module_map_rc
|
|
.borrow_mut()
|
|
.pending_dynamic_imports
|
|
.push(load.into_future());
|
|
}
|
|
Err(err) => self.dynamic_import_reject(dyn_import_id, err),
|
|
}
|
|
}
|
|
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.
|
|
self.dynamic_import_reject(dyn_import_id, err)
|
|
}
|
|
}
|
|
} else {
|
|
// The top-level module from a dynamic import has been instantiated.
|
|
// Load is done.
|
|
let module_id = load.expect_finished();
|
|
let result = self.instantiate_module(module_id);
|
|
if let Err(err) = result {
|
|
self.dynamic_import_reject(dyn_import_id, err);
|
|
}
|
|
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 "--harmony-top-level-await"
|
|
/// flag on - it means that each module evaluation returns a promise
|
|
/// from V8.
|
|
///
|
|
/// 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 state_rc = Self::state(self.v8_isolate());
|
|
|
|
let maybe_module_evaluation =
|
|
state_rc.borrow_mut().pending_mod_evaluate.take();
|
|
|
|
if maybe_module_evaluation.is_none() {
|
|
return;
|
|
}
|
|
|
|
let module_evaluation = maybe_module_evaluation.unwrap();
|
|
let scope = &mut self.handle_scope();
|
|
|
|
let promise = module_evaluation.promise.get(scope);
|
|
let mut sender = module_evaluation.sender.clone();
|
|
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 _ = sender.try_send(Ok(()));
|
|
}
|
|
v8::PromiseState::Rejected => {
|
|
let exception = promise.result(scope);
|
|
scope.perform_microtask_checkpoint();
|
|
let err1 = exception_to_err_result::<()>(scope, exception, false)
|
|
.map_err(|err| attach_handle_to_error(scope, err, exception))
|
|
.unwrap_err();
|
|
// Receiver end might have been already dropped, ignore the result
|
|
let _ = sender.try_send(Err(err1));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn evaluate_dyn_imports(&mut self) {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
|
|
loop {
|
|
let maybe_pending_dyn_evaluate =
|
|
state_rc.borrow_mut().pending_dyn_mod_evaluate.pop_front();
|
|
|
|
if maybe_pending_dyn_evaluate.is_none() {
|
|
break;
|
|
}
|
|
|
|
let maybe_result = {
|
|
let scope = &mut self.handle_scope();
|
|
let pending_dyn_evaluate = maybe_pending_dyn_evaluate.unwrap();
|
|
|
|
let module_id = pending_dyn_evaluate.module_id;
|
|
let promise = pending_dyn_evaluate.promise.get(scope);
|
|
let _module = pending_dyn_evaluate.module.get(scope);
|
|
let promise_state = promise.state();
|
|
|
|
match promise_state {
|
|
v8::PromiseState::Pending => {
|
|
state_rc
|
|
.borrow_mut()
|
|
.pending_dyn_mod_evaluate
|
|
.push_back(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 err1 = exception_to_err_result::<()>(scope, exception, false)
|
|
.map_err(|err| attach_handle_to_error(scope, err, exception))
|
|
.unwrap_err();
|
|
Some(Err((pending_dyn_evaluate.load_id, err1)))
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(result) = maybe_result {
|
|
match result {
|
|
Ok((dyn_import_id, module_id)) => {
|
|
self.dynamic_import_resolve(dyn_import_id, module_id);
|
|
}
|
|
Err((dyn_import_id, err1)) => {
|
|
self.dynamic_import_reject(dyn_import_id, err1);
|
|
}
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Asynchronously load specified module and all of its dependencies
|
|
///
|
|
/// User must call `JsRuntime::mod_evaluate` with returned `ModuleId`
|
|
/// manually after load is finished.
|
|
pub async fn load_module(
|
|
&mut self,
|
|
specifier: &ModuleSpecifier,
|
|
code: Option<String>,
|
|
) -> Result<ModuleId, AnyError> {
|
|
let module_map_rc = Self::module_map(self.v8_isolate());
|
|
|
|
let load = module_map_rc.borrow().load_main(specifier.as_str(), code);
|
|
|
|
let (_load_id, prepare_result) = load.prepare().await;
|
|
|
|
let mut load = prepare_result?;
|
|
|
|
while let Some(info_result) = load.next().await {
|
|
let info = info_result?;
|
|
let scope = &mut self.handle_scope();
|
|
module_map_rc
|
|
.borrow_mut()
|
|
.register_during_load(scope, info, &mut load)?;
|
|
}
|
|
|
|
let root_id = load.expect_finished();
|
|
self.instantiate_module(root_id).map(|_| root_id)
|
|
}
|
|
|
|
fn poll_pending_ops(
|
|
&mut self,
|
|
cx: &mut Context,
|
|
) -> Vec<(PromiseId, OpResult)> {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
let mut async_responses: Vec<(PromiseId, OpResult)> = Vec::new();
|
|
|
|
let mut state = state_rc.borrow_mut();
|
|
|
|
// Now handle actual ops.
|
|
state.have_unpolled_ops = false;
|
|
|
|
loop {
|
|
let pending_r = state.pending_ops.poll_next_unpin(cx);
|
|
match pending_r {
|
|
Poll::Ready(None) => break,
|
|
Poll::Pending => break,
|
|
Poll::Ready(Some((promise_id, resp))) => {
|
|
async_responses.push((promise_id, resp));
|
|
}
|
|
};
|
|
}
|
|
|
|
loop {
|
|
let unref_r = state.pending_unref_ops.poll_next_unpin(cx);
|
|
match unref_r {
|
|
Poll::Ready(None) => break,
|
|
Poll::Pending => break,
|
|
Poll::Ready(Some((promise_id, resp))) => {
|
|
async_responses.push((promise_id, resp));
|
|
}
|
|
};
|
|
}
|
|
|
|
async_responses
|
|
}
|
|
|
|
fn check_promise_exceptions(&mut self) -> Result<(), AnyError> {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
let mut state = state_rc.borrow_mut();
|
|
|
|
if state.pending_promise_exceptions.is_empty() {
|
|
return Ok(());
|
|
}
|
|
|
|
let key = {
|
|
state
|
|
.pending_promise_exceptions
|
|
.keys()
|
|
.next()
|
|
.unwrap()
|
|
.clone()
|
|
};
|
|
let handle = state.pending_promise_exceptions.remove(&key).unwrap();
|
|
drop(state);
|
|
|
|
let scope = &mut self.handle_scope();
|
|
let exception = v8::Local::new(scope, handle);
|
|
exception_to_err_result(scope, exception, true)
|
|
}
|
|
|
|
// Send finished responses to JS
|
|
fn async_op_response(
|
|
&mut self,
|
|
async_responses: Vec<(PromiseId, OpResult)>,
|
|
) -> Result<(), AnyError> {
|
|
let state_rc = Self::state(self.v8_isolate());
|
|
|
|
let async_responses_size = async_responses.len();
|
|
if async_responses_size == 0 {
|
|
return Ok(());
|
|
}
|
|
|
|
let js_recv_cb_handle = state_rc.borrow().js_recv_cb.clone().unwrap();
|
|
|
|
let scope = &mut self.handle_scope();
|
|
|
|
// 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
|
|
let mut args: Vec<v8::Local<v8::Value>> =
|
|
Vec::with_capacity(2 * async_responses_size);
|
|
for overflown_response in async_responses {
|
|
let (promise_id, resp) = overflown_response;
|
|
args.push(v8::Integer::new(scope, promise_id as i32).into());
|
|
args.push(resp.to_v8(scope).unwrap());
|
|
}
|
|
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
let js_recv_cb = js_recv_cb_handle.get(tc_scope);
|
|
let this = v8::undefined(tc_scope).into();
|
|
js_recv_cb.call(tc_scope, this, args.as_slice());
|
|
|
|
match tc_scope.exception() {
|
|
None => Ok(()),
|
|
Some(exception) => exception_to_err_result(tc_scope, exception, false),
|
|
}
|
|
}
|
|
|
|
fn drain_macrotasks(&mut self) -> Result<(), AnyError> {
|
|
let js_macrotask_cb_handle =
|
|
match &Self::state(self.v8_isolate()).borrow().js_macrotask_cb {
|
|
Some(handle) => handle.clone(),
|
|
None => return Ok(()),
|
|
};
|
|
|
|
let scope = &mut self.handle_scope();
|
|
let js_macrotask_cb = js_macrotask_cb_handle.get(scope);
|
|
|
|
// Repeatedly invoke macrotask callback until it returns true (done),
|
|
// such that ready microtasks would be automatically run before
|
|
// next macrotask is processed.
|
|
let tc_scope = &mut v8::TryCatch::new(scope);
|
|
let this = v8::undefined(tc_scope).into();
|
|
loop {
|
|
let is_done = js_macrotask_cb.call(tc_scope, this, &[]);
|
|
|
|
if let Some(exception) = tc_scope.exception() {
|
|
return exception_to_err_result(tc_scope, exception, false);
|
|
}
|
|
|
|
let is_done = is_done.unwrap();
|
|
if is_done.is_true() {
|
|
break;
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
pub mod tests {
|
|
use super::*;
|
|
use crate::error::custom_error;
|
|
use crate::modules::ModuleSourceFuture;
|
|
use crate::op_sync;
|
|
use crate::ZeroCopyBuf;
|
|
use futures::future::lazy;
|
|
use std::ops::FnOnce;
|
|
use std::rc::Rc;
|
|
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
use std::sync::Arc;
|
|
|
|
pub fn run_in_task<F>(f: F)
|
|
where
|
|
F: FnOnce(&mut Context) + Send + 'static,
|
|
{
|
|
futures::executor::block_on(lazy(move |cx| f(cx)));
|
|
}
|
|
|
|
enum Mode {
|
|
Async,
|
|
AsyncZeroCopy(bool),
|
|
}
|
|
|
|
struct TestState {
|
|
mode: Mode,
|
|
dispatch_count: Arc<AtomicUsize>,
|
|
}
|
|
|
|
fn dispatch(rc_op_state: Rc<RefCell<OpState>>, payload: OpPayload) -> Op {
|
|
let rc_op_state2 = rc_op_state.clone();
|
|
let op_state_ = rc_op_state2.borrow();
|
|
let test_state = op_state_.borrow::<TestState>();
|
|
test_state.dispatch_count.fetch_add(1, Ordering::Relaxed);
|
|
let (control, buf): (u8, Option<ZeroCopyBuf>) =
|
|
payload.deserialize().unwrap();
|
|
match test_state.mode {
|
|
Mode::Async => {
|
|
assert_eq!(control, 42);
|
|
let resp = (0, serialize_op_result(Ok(43), rc_op_state));
|
|
Op::Async(Box::pin(futures::future::ready(resp)))
|
|
}
|
|
Mode::AsyncZeroCopy(has_buffer) => {
|
|
assert_eq!(buf.is_some(), has_buffer);
|
|
if let Some(buf) = buf {
|
|
assert_eq!(buf.len(), 1);
|
|
}
|
|
|
|
let resp = serialize_op_result(Ok(43), rc_op_state);
|
|
Op::Async(Box::pin(futures::future::ready((0, resp))))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn setup(mode: Mode) -> (JsRuntime, Arc<AtomicUsize>) {
|
|
let dispatch_count = Arc::new(AtomicUsize::new(0));
|
|
let mut runtime = JsRuntime::new(Default::default());
|
|
let op_state = runtime.op_state();
|
|
op_state.borrow_mut().put(TestState {
|
|
mode,
|
|
dispatch_count: dispatch_count.clone(),
|
|
});
|
|
|
|
runtime.register_op("op_test", dispatch);
|
|
runtime.sync_ops_cache();
|
|
|
|
runtime
|
|
.execute(
|
|
"setup.js",
|
|
r#"
|
|
function assert(cond) {
|
|
if (!cond) {
|
|
throw Error("assert");
|
|
}
|
|
}
|
|
"#,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(dispatch_count.load(Ordering::Relaxed), 0);
|
|
(runtime, dispatch_count)
|
|
}
|
|
|
|
#[test]
|
|
fn test_dispatch() {
|
|
let (mut runtime, dispatch_count) = setup(Mode::Async);
|
|
runtime
|
|
.execute(
|
|
"filename.js",
|
|
r#"
|
|
let control = 42;
|
|
Deno.core.opAsync("op_test", control);
|
|
async function main() {
|
|
Deno.core.opAsync("op_test", control);
|
|
}
|
|
main();
|
|
"#,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(dispatch_count.load(Ordering::Relaxed), 2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_dispatch_no_zero_copy_buf() {
|
|
let (mut runtime, dispatch_count) = setup(Mode::AsyncZeroCopy(false));
|
|
runtime
|
|
.execute(
|
|
"filename.js",
|
|
r#"
|
|
Deno.core.opAsync("op_test");
|
|
"#,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(dispatch_count.load(Ordering::Relaxed), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_dispatch_stack_zero_copy_bufs() {
|
|
let (mut runtime, dispatch_count) = setup(Mode::AsyncZeroCopy(true));
|
|
runtime
|
|
.execute(
|
|
"filename.js",
|
|
r#"
|
|
let zero_copy_a = new Uint8Array([0]);
|
|
Deno.core.opAsync("op_test", null, zero_copy_a);
|
|
"#,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(dispatch_count.load(Ordering::Relaxed), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn terminate_execution() {
|
|
let (mut isolate, _dispatch_count) = setup(Mode::Async);
|
|
// TODO(piscisaureus): in rusty_v8, the `thread_safe_handle()` method
|
|
// should not require a mutable reference to `struct rusty_v8::Isolate`.
|
|
let v8_isolate_handle = isolate.v8_isolate().thread_safe_handle();
|
|
|
|
let terminator_thread = std::thread::spawn(move || {
|
|
// allow deno to boot and run
|
|
std::thread::sleep(std::time::Duration::from_millis(100));
|
|
|
|
// terminate execution
|
|
let ok = v8_isolate_handle.terminate_execution();
|
|
assert!(ok);
|
|
});
|
|
|
|
// Rn an infinite loop, which should be terminated.
|
|
match isolate.execute("infinite_loop.js", "for(;;) {}") {
|
|
Ok(_) => panic!("execution should be terminated"),
|
|
Err(e) => {
|
|
assert_eq!(e.to_string(), "Uncaught Error: execution terminated")
|
|
}
|
|
};
|
|
|
|
// Cancel the execution-terminating exception in order to allow script
|
|
// execution again.
|
|
let ok = isolate.v8_isolate().cancel_terminate_execution();
|
|
assert!(ok);
|
|
|
|
// Verify that the isolate usable again.
|
|
isolate
|
|
.execute("simple.js", "1 + 1")
|
|
.expect("execution should be possible again");
|
|
|
|
terminator_thread.join().unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn dangling_shared_isolate() {
|
|
let v8_isolate_handle = {
|
|
// isolate is dropped at the end of this block
|
|
let (mut runtime, _dispatch_count) = setup(Mode::Async);
|
|
// TODO(piscisaureus): in rusty_v8, the `thread_safe_handle()` method
|
|
// should not require a mutable reference to `struct rusty_v8::Isolate`.
|
|
runtime.v8_isolate().thread_safe_handle()
|
|
};
|
|
|
|
// this should not SEGFAULT
|
|
v8_isolate_handle.terminate_execution();
|
|
}
|
|
|
|
#[test]
|
|
fn test_pre_dispatch() {
|
|
run_in_task(|mut cx| {
|
|
let (mut runtime, _dispatch_count) = setup(Mode::Async);
|
|
runtime
|
|
.execute(
|
|
"bad_op_id.js",
|
|
r#"
|
|
let thrown;
|
|
try {
|
|
Deno.core.opSync(100);
|
|
} catch (e) {
|
|
thrown = e;
|
|
}
|
|
assert(String(thrown) === "TypeError: Unknown op id: 100");
|
|
"#,
|
|
)
|
|
.unwrap();
|
|
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(&mut cx, false) {
|
|
unreachable!();
|
|
}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn syntax_error() {
|
|
let mut runtime = JsRuntime::new(Default::default());
|
|
let src = "hocuspocus(";
|
|
let r = runtime.execute("i.js", src);
|
|
let e = r.unwrap_err();
|
|
let js_error = e.downcast::<JsError>().unwrap();
|
|
assert_eq!(js_error.end_column, Some(11));
|
|
}
|
|
|
|
#[test]
|
|
fn test_encode_decode() {
|
|
run_in_task(|mut cx| {
|
|
let (mut runtime, _dispatch_count) = setup(Mode::Async);
|
|
runtime
|
|
.execute(
|
|
"encode_decode_test.js",
|
|
include_str!("encode_decode_test.js"),
|
|
)
|
|
.unwrap();
|
|
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(&mut cx, false) {
|
|
unreachable!();
|
|
}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn test_serialize_deserialize() {
|
|
run_in_task(|mut cx| {
|
|
let (mut runtime, _dispatch_count) = setup(Mode::Async);
|
|
runtime
|
|
.execute(
|
|
"serialize_deserialize_test.js",
|
|
include_str!("serialize_deserialize_test.js"),
|
|
)
|
|
.unwrap();
|
|
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(&mut cx, false) {
|
|
unreachable!();
|
|
}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_builder() {
|
|
fn op_err(
|
|
_: &mut OpState,
|
|
_: (),
|
|
_: Option<ZeroCopyBuf>,
|
|
) -> Result<(), AnyError> {
|
|
Err(custom_error("DOMExceptionOperationError", "abc"))
|
|
}
|
|
|
|
pub fn get_error_class_name(_: &AnyError) -> &'static str {
|
|
"DOMExceptionOperationError"
|
|
}
|
|
|
|
run_in_task(|mut cx| {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
get_error_class_fn: Some(&get_error_class_name),
|
|
..Default::default()
|
|
});
|
|
runtime.register_op("op_err", op_sync(op_err));
|
|
runtime.sync_ops_cache();
|
|
runtime
|
|
.execute(
|
|
"error_builder_test.js",
|
|
include_str!("error_builder_test.js"),
|
|
)
|
|
.unwrap();
|
|
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(&mut cx, false) {
|
|
unreachable!();
|
|
}
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn will_snapshot() {
|
|
let snapshot = {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
will_snapshot: true,
|
|
..Default::default()
|
|
});
|
|
runtime.execute("a.js", "a = 1 + 2").unwrap();
|
|
runtime.snapshot()
|
|
};
|
|
|
|
let snapshot = Snapshot::JustCreated(snapshot);
|
|
let mut runtime2 = JsRuntime::new(RuntimeOptions {
|
|
startup_snapshot: Some(snapshot),
|
|
..Default::default()
|
|
});
|
|
runtime2
|
|
.execute("check.js", "if (a != 3) throw Error('x')")
|
|
.unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_boxed_snapshot() {
|
|
let snapshot = {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
will_snapshot: true,
|
|
..Default::default()
|
|
});
|
|
runtime.execute("a.js", "a = 1 + 2").unwrap();
|
|
let snap: &[u8] = &*runtime.snapshot();
|
|
Vec::from(snap).into_boxed_slice()
|
|
};
|
|
|
|
let snapshot = Snapshot::Boxed(snapshot);
|
|
let mut runtime2 = JsRuntime::new(RuntimeOptions {
|
|
startup_snapshot: Some(snapshot),
|
|
..Default::default()
|
|
});
|
|
runtime2
|
|
.execute("check.js", "if (a != 3) throw Error('x')")
|
|
.unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn test_heap_limits() {
|
|
let create_params = v8::Isolate::create_params().heap_limits(0, 20 * 1024);
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
create_params: Some(create_params),
|
|
..Default::default()
|
|
});
|
|
let cb_handle = runtime.v8_isolate().thread_safe_handle();
|
|
|
|
let callback_invoke_count = Rc::new(AtomicUsize::default());
|
|
let inner_invoke_count = Rc::clone(&callback_invoke_count);
|
|
|
|
runtime.add_near_heap_limit_callback(
|
|
move |current_limit, _initial_limit| {
|
|
inner_invoke_count.fetch_add(1, Ordering::SeqCst);
|
|
cb_handle.terminate_execution();
|
|
current_limit * 2
|
|
},
|
|
);
|
|
let err = runtime
|
|
.execute(
|
|
"script name",
|
|
r#"let s = ""; while(true) { s += "Hello"; }"#,
|
|
)
|
|
.expect_err("script should fail");
|
|
assert_eq!(
|
|
"Uncaught Error: execution terminated",
|
|
err.downcast::<JsError>().unwrap().message
|
|
);
|
|
assert!(callback_invoke_count.load(Ordering::SeqCst) > 0)
|
|
}
|
|
|
|
#[test]
|
|
fn test_heap_limit_cb_remove() {
|
|
let mut runtime = JsRuntime::new(Default::default());
|
|
|
|
runtime.add_near_heap_limit_callback(|current_limit, _initial_limit| {
|
|
current_limit * 2
|
|
});
|
|
runtime.remove_near_heap_limit_callback(20 * 1024);
|
|
assert!(runtime.allocations.near_heap_limit_callback_data.is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn test_heap_limit_cb_multiple() {
|
|
let create_params = v8::Isolate::create_params().heap_limits(0, 20 * 1024);
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
create_params: Some(create_params),
|
|
..Default::default()
|
|
});
|
|
let cb_handle = runtime.v8_isolate().thread_safe_handle();
|
|
|
|
let callback_invoke_count_first = Rc::new(AtomicUsize::default());
|
|
let inner_invoke_count_first = Rc::clone(&callback_invoke_count_first);
|
|
runtime.add_near_heap_limit_callback(
|
|
move |current_limit, _initial_limit| {
|
|
inner_invoke_count_first.fetch_add(1, Ordering::SeqCst);
|
|
current_limit * 2
|
|
},
|
|
);
|
|
|
|
let callback_invoke_count_second = Rc::new(AtomicUsize::default());
|
|
let inner_invoke_count_second = Rc::clone(&callback_invoke_count_second);
|
|
runtime.add_near_heap_limit_callback(
|
|
move |current_limit, _initial_limit| {
|
|
inner_invoke_count_second.fetch_add(1, Ordering::SeqCst);
|
|
cb_handle.terminate_execution();
|
|
current_limit * 2
|
|
},
|
|
);
|
|
|
|
let err = runtime
|
|
.execute(
|
|
"script name",
|
|
r#"let s = ""; while(true) { s += "Hello"; }"#,
|
|
)
|
|
.expect_err("script should fail");
|
|
assert_eq!(
|
|
"Uncaught Error: execution terminated",
|
|
err.downcast::<JsError>().unwrap().message
|
|
);
|
|
assert_eq!(0, callback_invoke_count_first.load(Ordering::SeqCst));
|
|
assert!(callback_invoke_count_second.load(Ordering::SeqCst) > 0);
|
|
}
|
|
|
|
#[test]
|
|
fn es_snapshot() {
|
|
#[derive(Default)]
|
|
struct ModsLoader;
|
|
|
|
impl ModuleLoader for ModsLoader {
|
|
fn resolve(
|
|
&self,
|
|
_op_state: Rc<RefCell<OpState>>,
|
|
specifier: &str,
|
|
referrer: &str,
|
|
_is_main: bool,
|
|
) -> Result<ModuleSpecifier, AnyError> {
|
|
assert_eq!(specifier, "file:///main.js");
|
|
assert_eq!(referrer, ".");
|
|
let s = crate::resolve_import(specifier, referrer).unwrap();
|
|
Ok(s)
|
|
}
|
|
|
|
fn load(
|
|
&self,
|
|
_op_state: Rc<RefCell<OpState>>,
|
|
_module_specifier: &ModuleSpecifier,
|
|
_maybe_referrer: Option<ModuleSpecifier>,
|
|
_is_dyn_import: bool,
|
|
) -> Pin<Box<ModuleSourceFuture>> {
|
|
unreachable!()
|
|
}
|
|
}
|
|
|
|
let loader = std::rc::Rc::new(ModsLoader::default());
|
|
let mut runtime = JsRuntime::new(RuntimeOptions {
|
|
module_loader: Some(loader),
|
|
will_snapshot: true,
|
|
..Default::default()
|
|
});
|
|
|
|
let specifier = crate::resolve_url("file:///main.js").unwrap();
|
|
let source_code = "Deno.core.print('hello\\n')".to_string();
|
|
|
|
let module_id = futures::executor::block_on(
|
|
runtime.load_module(&specifier, Some(source_code)),
|
|
)
|
|
.unwrap();
|
|
|
|
runtime.mod_evaluate(module_id);
|
|
futures::executor::block_on(runtime.run_event_loop(false)).unwrap();
|
|
|
|
let _snapshot = runtime.snapshot();
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_without_stack() {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions::default());
|
|
// SyntaxError
|
|
let result = runtime.execute(
|
|
"error_without_stack.js",
|
|
r#"
|
|
function main() {
|
|
console.log("asdf);
|
|
}
|
|
|
|
main();
|
|
"#,
|
|
);
|
|
let expected_error = r#"Uncaught SyntaxError: Invalid or unexpected token
|
|
at error_without_stack.js:3:14"#;
|
|
assert_eq!(result.unwrap_err().to_string(), expected_error);
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_stack() {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions::default());
|
|
let result = runtime.execute(
|
|
"error_stack.js",
|
|
r#"
|
|
function assert(cond) {
|
|
if (!cond) {
|
|
throw Error("assert");
|
|
}
|
|
}
|
|
|
|
function main() {
|
|
assert(false);
|
|
}
|
|
|
|
main();
|
|
"#,
|
|
);
|
|
let expected_error = r#"Error: assert
|
|
at assert (error_stack.js:4:11)
|
|
at main (error_stack.js:9:3)
|
|
at error_stack.js:12:1"#;
|
|
assert_eq!(result.unwrap_err().to_string(), expected_error);
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_async_stack() {
|
|
run_in_task(|cx| {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions::default());
|
|
runtime
|
|
.execute(
|
|
"error_async_stack.js",
|
|
r#"
|
|
(async () => {
|
|
const p = (async () => {
|
|
await Promise.resolve().then(() => {
|
|
throw new Error("async");
|
|
});
|
|
})();
|
|
|
|
try {
|
|
await p;
|
|
} catch (error) {
|
|
console.log(error.stack);
|
|
throw error;
|
|
}
|
|
})();"#,
|
|
)
|
|
.unwrap();
|
|
let expected_error = r#"Error: async
|
|
at error_async_stack.js:5:13
|
|
at async error_async_stack.js:4:5
|
|
at async error_async_stack.js:10:5"#;
|
|
|
|
match runtime.poll_event_loop(cx, false) {
|
|
Poll::Ready(Err(e)) => {
|
|
assert_eq!(e.to_string(), expected_error);
|
|
}
|
|
_ => panic!(),
|
|
};
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn test_core_js_stack_frame() {
|
|
let mut runtime = JsRuntime::new(RuntimeOptions::default());
|
|
// Call non-existent op so we get error from `core.js`
|
|
let error = runtime
|
|
.execute(
|
|
"core_js_stack_frame.js",
|
|
"Deno.core.opSync('non_existent');",
|
|
)
|
|
.unwrap_err();
|
|
let error_string = error.to_string();
|
|
// Test that the script specifier is a URL: `deno:<repo-relative path>`.
|
|
assert!(error_string.contains("deno:core/core.js"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_v8_platform() {
|
|
let options = RuntimeOptions {
|
|
v8_platform: Some(v8::new_default_platform()),
|
|
..Default::default()
|
|
};
|
|
let mut runtime = JsRuntime::new(options);
|
|
runtime.execute("<none>", "").unwrap();
|
|
}
|
|
}
|