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denoland-deno/core/runtime.rs
ud2 40987178c4
fix(core): always report the first error on unhandled rejection (#18992) 
The root cause of denoland/deno_std#3320, I believe, is that
`pending_promise_rejections` is a `HashMap` whose entries are in
arbitrary order, and as a result either of the two errors (`AddrInUse`
and `TypeError`) may be selected when determining which one to report. I
changed the field to a `VecDeque` so that the first error (`AddrInUse`
in this case) is always selected.
2023-05-08 00:27:59 +02:00

4854 lines
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use crate::bindings;
use crate::error::generic_error;
use crate::error::to_v8_type_error;
use crate::error::JsError;
use crate::extensions::OpDecl;
use crate::extensions::OpEventLoopFn;
use crate::inspector::JsRuntimeInspector;
use crate::module_specifier::ModuleSpecifier;
use crate::modules::ExtModuleLoaderCb;
use crate::modules::ModuleCode;
use crate::modules::ModuleError;
use crate::modules::ModuleId;
use crate::modules::ModuleLoadId;
use crate::modules::ModuleLoader;
use crate::modules::ModuleMap;
use crate::ops::*;
use crate::realm::ContextState;
use crate::realm::JsRealm;
use crate::realm::JsRealmLocal;
use crate::snapshot_util;
use crate::source_map::SourceMapCache;
use crate::source_map::SourceMapGetter;
use crate::Extension;
use crate::ExtensionFileSource;
use crate::NoopModuleLoader;
use crate::OpMiddlewareFn;
use crate::OpResult;
use crate::OpState;
use crate::PromiseId;
use anyhow::Context as AnyhowContext;
use anyhow::Error;
use futures::channel::oneshot;
use futures::future::poll_fn;
use futures::future::Future;
use futures::future::FutureExt;
use futures::future::MaybeDone;
use futures::stream::FuturesUnordered;
use futures::stream::StreamExt;
use futures::task::noop_waker;
use futures::task::AtomicWaker;
use smallvec::SmallVec;
use std::any::Any;
use std::cell::RefCell;
use std::collections::HashMap;
use std::ffi::c_void;
use std::option::Option;
use std::pin::Pin;
use std::rc::Rc;
use std::sync::Arc;
use std::sync::Mutex;
use std::sync::Once;
use std::task::Context;
use std::task::Poll;
use v8::OwnedIsolate;
pub enum Snapshot {
Static(&'static [u8]),
JustCreated(v8::StartupData),
Boxed(Box<[u8]>),
}
pub type JsErrorCreateFn = dyn Fn(JsError) -> Error;
pub type GetErrorClassFn = &'static dyn for<'e> Fn(&'e Error) -> &'static str;
/// Objects that need to live as long as the isolate
#[derive(Default)]
struct IsolateAllocations {
near_heap_limit_callback_data:
Option<(Box<RefCell<dyn Any>>, v8::NearHeapLimitCallback)>,
}
/// A custom allocator for array buffers for V8. It uses `jemalloc` so it's
/// not available on Windows.
#[cfg(not(target_env = "msvc"))]
mod custom_allocator {
use std::ffi::c_void;
pub struct RustAllocator;
pub unsafe extern "C" fn allocate(
_alloc: &RustAllocator,
n: usize,
) -> *mut c_void {
tikv_jemalloc_sys::calloc(1, n)
}
pub unsafe extern "C" fn allocate_uninitialized(
_alloc: &RustAllocator,
n: usize,
) -> *mut c_void {
tikv_jemalloc_sys::malloc(n)
}
pub unsafe extern "C" fn free(
_alloc: &RustAllocator,
data: *mut c_void,
_n: usize,
) {
tikv_jemalloc_sys::free(data)
}
pub unsafe extern "C" fn reallocate(
_alloc: &RustAllocator,
prev: *mut c_void,
_oldlen: usize,
newlen: usize,
) -> *mut c_void {
tikv_jemalloc_sys::realloc(prev, newlen)
}
pub unsafe extern "C" fn drop(_alloc: *const RustAllocator) {}
}
/// A single execution context of JavaScript. Corresponds roughly to the "Web
/// Worker" concept in the DOM. A JsRuntime is a Future that can be used with
/// an event loop (Tokio, async_std).
////
/// The JsRuntime future completes when there is an error or when all
/// pending ops have completed.
///
/// Pending ops are created in JavaScript by calling Deno.core.opAsync(), and in Rust
/// by implementing an async function that takes a serde::Deserialize "control argument"
/// and an optional zero copy buffer, each async Op is tied to a Promise in JavaScript.
pub struct JsRuntime {
state: Rc<RefCell<JsRuntimeState>>,
module_map: Option<Rc<RefCell<ModuleMap>>>,
// This is an Option<OwnedIsolate> instead of just OwnedIsolate to workaround
// a safety issue with SnapshotCreator. See JsRuntime::drop.
v8_isolate: Option<v8::OwnedIsolate>,
snapshot_options: snapshot_util::SnapshotOptions,
allocations: IsolateAllocations,
extensions: Rc<RefCell<Vec<Extension>>>,
event_loop_middlewares: Vec<Box<OpEventLoopFn>>,
// Marks if this is considered the top-level runtime. Used only be inspector.
is_main: bool,
}
pub(crate) struct DynImportModEvaluate {
load_id: ModuleLoadId,
module_id: ModuleId,
promise: v8::Global<v8::Promise>,
module: v8::Global<v8::Module>,
}
pub(crate) struct ModEvaluate {
pub(crate) promise: Option<v8::Global<v8::Promise>>,
pub(crate) has_evaluated: bool,
pub(crate) handled_promise_rejections: Vec<v8::Global<v8::Promise>>,
sender: oneshot::Sender<Result<(), Error>>,
}
pub struct CrossIsolateStore<T>(Arc<Mutex<CrossIsolateStoreInner<T>>>);
struct CrossIsolateStoreInner<T> {
map: HashMap<u32, T>,
last_id: u32,
}
impl<T> CrossIsolateStore<T> {
pub(crate) fn insert(&self, value: T) -> u32 {
let mut store = self.0.lock().unwrap();
let last_id = store.last_id;
store.map.insert(last_id, value);
store.last_id += 1;
last_id
}
pub(crate) fn take(&self, id: u32) -> Option<T> {
let mut store = self.0.lock().unwrap();
store.map.remove(&id)
}
}
impl<T> Default for CrossIsolateStore<T> {
fn default() -> Self {
CrossIsolateStore(Arc::new(Mutex::new(CrossIsolateStoreInner {
map: Default::default(),
last_id: 0,
})))
}
}
impl<T> Clone for CrossIsolateStore<T> {
fn clone(&self) -> Self {
Self(self.0.clone())
}
}
pub type SharedArrayBufferStore =
CrossIsolateStore<v8::SharedRef<v8::BackingStore>>;
pub type CompiledWasmModuleStore = CrossIsolateStore<v8::CompiledWasmModule>;
/// Internal state for JsRuntime which is stored in one of v8::Isolate's
/// embedder slots.
pub struct JsRuntimeState {
global_realm: Option<JsRealm>,
known_realms: Vec<v8::Weak<v8::Context>>,
pub(crate) has_tick_scheduled: bool,
pub(crate) pending_dyn_mod_evaluate: Vec<DynImportModEvaluate>,
pub(crate) pending_mod_evaluate: Option<ModEvaluate>,
/// A counter used to delay our dynamic import deadlock detection by one spin
/// of the event loop.
dyn_module_evaluate_idle_counter: u32,
pub(crate) source_map_getter: Option<Rc<Box<dyn SourceMapGetter>>>,
pub(crate) source_map_cache: Rc<RefCell<SourceMapCache>>,
pub(crate) pending_ops: FuturesUnordered<OpCall>,
pub(crate) have_unpolled_ops: bool,
pub(crate) op_state: Rc<RefCell<OpState>>,
pub(crate) shared_array_buffer_store: Option<SharedArrayBufferStore>,
pub(crate) compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
/// The error that was passed to an `op_dispatch_exception` call.
/// It will be retrieved by `exception_to_err_result` and used as an error
/// instead of any other exceptions.
// TODO(nayeemrmn): This is polled in `exception_to_err_result()` which is
// flimsy. Try to poll it similarly to `pending_promise_rejections`.
pub(crate) dispatched_exception: Option<v8::Global<v8::Value>>,
pub(crate) inspector: Option<Rc<RefCell<JsRuntimeInspector>>>,
waker: AtomicWaker,
}
fn v8_init(
v8_platform: Option<v8::SharedRef<v8::Platform>>,
predictable: bool,
) {
// Include 10MB ICU data file.
#[repr(C, align(16))]
struct IcuData([u8; 10541264]);
static ICU_DATA: IcuData = IcuData(*include_bytes!("icudtl.dat"));
v8::icu::set_common_data_72(&ICU_DATA.0).unwrap();
let flags = concat!(
" --wasm-test-streaming",
" --harmony-import-assertions",
" --no-validate-asm",
" --turbo_fast_api_calls",
" --harmony-change-array-by-copy",
);
if predictable {
v8::V8::set_flags_from_string(&format!(
"{}{}",
flags, " --predictable --random-seed=42"
));
} else {
v8::V8::set_flags_from_string(flags);
}
let v8_platform = v8_platform
.unwrap_or_else(|| v8::new_default_platform(0, false).make_shared());
v8::V8::initialize_platform(v8_platform);
v8::V8::initialize();
}
pub const V8_WRAPPER_TYPE_INDEX: i32 = 0;
pub const V8_WRAPPER_OBJECT_INDEX: i32 = 1;
#[derive(Default)]
pub struct RuntimeOptions {
/// Source map reference for errors.
pub source_map_getter: Option<Box<dyn SourceMapGetter>>,
/// Allows to map error type to a string "class" used to represent
/// error in JavaScript.
pub get_error_class_fn: Option<GetErrorClassFn>,
/// Implementation of `ModuleLoader` which will be
/// called when V8 requests to load ES modules.
///
/// If not provided runtime will error if code being
/// executed tries to load modules.
pub module_loader: Option<Rc<dyn ModuleLoader>>,
/// JsRuntime extensions, not to be confused with ES modules.
/// Only ops registered by extensions will be initialized. If you need
/// to execute JS code from extensions, pass source files in `js` or `esm`
/// option on `ExtensionBuilder`.
///
/// If you are creating a runtime from a snapshot take care not to include
/// JavaScript sources in the extensions.
pub extensions: Vec<Extension>,
/// V8 snapshot that should be loaded on startup.
pub startup_snapshot: Option<Snapshot>,
/// Prepare runtime to take snapshot of loaded code.
/// The snapshot is deterministic and uses predictable random numbers.
pub will_snapshot: bool,
/// An optional callback that will be called for each module that is loaded
/// during snapshotting. This callback can be used to transpile source on the
/// fly, during snapshotting, eg. to transpile TypeScript to JavaScript.
pub snapshot_module_load_cb: Option<ExtModuleLoaderCb>,
/// Isolate creation parameters.
pub create_params: Option<v8::CreateParams>,
/// V8 platform instance to use. Used when Deno initializes V8
/// (which it only does once), otherwise it's silenty dropped.
pub v8_platform: Option<v8::SharedRef<v8::Platform>>,
/// The store to use for transferring SharedArrayBuffers between isolates.
/// If multiple isolates should have the possibility of sharing
/// SharedArrayBuffers, they should use the same [SharedArrayBufferStore]. If
/// no [SharedArrayBufferStore] is specified, SharedArrayBuffer can not be
/// serialized.
pub shared_array_buffer_store: Option<SharedArrayBufferStore>,
/// The store to use for transferring `WebAssembly.Module` objects between
/// isolates.
/// If multiple isolates should have the possibility of sharing
/// `WebAssembly.Module` objects, they should use the same
/// [CompiledWasmModuleStore]. If no [CompiledWasmModuleStore] is specified,
/// `WebAssembly.Module` objects cannot be serialized.
pub compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
/// Start inspector instance to allow debuggers to connect.
pub inspector: bool,
/// Describe if this is the main runtime instance, used by debuggers in some
/// situation - like disconnecting when program finishes running.
pub is_main: bool,
}
impl Drop for JsRuntime {
fn drop(&mut self) {
if let Some(v8_isolate) = self.v8_isolate.as_mut() {
Self::drop_state_and_module_map(v8_isolate);
}
}
}
impl JsRuntime {
const STATE_DATA_OFFSET: u32 = 0;
const MODULE_MAP_DATA_OFFSET: u32 = 1;
/// Only constructor, configuration is done through `options`.
pub fn new(mut options: RuntimeOptions) -> Self {
let v8_platform = options.v8_platform.take();
static DENO_INIT: Once = Once::new();
DENO_INIT.call_once(move || v8_init(v8_platform, options.will_snapshot));
// Add builtins extension
// TODO(bartlomieju): remove this in favor of `SnapshotOptions`.
let has_startup_snapshot = options.startup_snapshot.is_some();
if !has_startup_snapshot {
options
.extensions
.insert(0, crate::ops_builtin::core::init_ops_and_esm());
} else {
options
.extensions
.insert(0, crate::ops_builtin::core::init_ops());
}
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;
}
let op_state = Rc::new(RefCell::new(op_state));
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(),
pending_ops: FuturesUnordered::new(),
shared_array_buffer_store: options.shared_array_buffer_store,
compiled_wasm_module_store: options.compiled_wasm_module_store,
op_state: op_state.clone(),
waker: AtomicWaker::new(),
have_unpolled_ops: false,
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 op_ctxs = ops
.into_iter()
.enumerate()
.map(|(id, decl)| {
OpCtx::new(id as u16, 0, Rc::new(decl), op_state.clone(), weak.clone())
})
.collect::<Vec<_>>()
.into_boxed_slice();
let snapshot_options = snapshot_util::SnapshotOptions::from_bools(
options.startup_snapshot.is_some(),
options.will_snapshot,
);
let refs = bindings::external_references(&op_ctxs);
// V8 takes ownership of external_references.
let refs: &'static v8::ExternalReferences = Box::leak(Box::new(refs));
let global_context;
let mut maybe_snapshotted_data = None;
let mut isolate = if snapshot_options.will_snapshot() {
let snapshot_creator =
snapshot_util::create_snapshot_creator(refs, options.startup_snapshot);
let mut isolate = JsRuntime::setup_isolate(snapshot_creator);
{
let scope = &mut v8::HandleScope::new(&mut isolate);
let context =
bindings::initialize_context(scope, &op_ctxs, snapshot_options);
// Get module map data from the snapshot
if has_startup_snapshot {
maybe_snapshotted_data =
Some(snapshot_util::get_snapshotted_data(scope, context));
}
global_context = v8::Global::new(scope, context);
}
isolate
} else {
#[cfg(not(target_env = "msvc"))]
let vtable: &'static v8::RustAllocatorVtable<
custom_allocator::RustAllocator,
> = &v8::RustAllocatorVtable {
allocate: custom_allocator::allocate,
allocate_uninitialized: custom_allocator::allocate_uninitialized,
free: custom_allocator::free,
reallocate: custom_allocator::reallocate,
drop: custom_allocator::drop,
};
#[cfg(not(target_env = "msvc"))]
let allocator = Arc::new(custom_allocator::RustAllocator);
#[allow(unused_mut)]
let mut params = options
.create_params
.take()
.unwrap_or_else(|| {
v8::CreateParams::default().embedder_wrapper_type_info_offsets(
V8_WRAPPER_TYPE_INDEX,
V8_WRAPPER_OBJECT_INDEX,
)
})
.external_references(&**refs);
#[cfg(not(target_env = "msvc"))]
// SAFETY: We are leaking the created `allocator` variable so we're sure
// it will outlive the created isolate. We also made sure that the vtable
// is correct.
let mut params = params.array_buffer_allocator(unsafe {
v8::new_rust_allocator(Arc::into_raw(allocator), vtable)
});
if let Some(snapshot) = options.startup_snapshot {
params = match snapshot {
Snapshot::Static(data) => params.snapshot_blob(data),
Snapshot::JustCreated(data) => params.snapshot_blob(data),
Snapshot::Boxed(data) => params.snapshot_blob(data),
};
}
let isolate = v8::Isolate::new(params);
let mut isolate = JsRuntime::setup_isolate(isolate);
{
let scope = &mut v8::HandleScope::new(&mut isolate);
let context =
bindings::initialize_context(scope, &op_ctxs, snapshot_options);
// Get module map data from the snapshot
if has_startup_snapshot {
maybe_snapshotted_data =
Some(snapshot_util::get_snapshotted_data(scope, context));
}
global_context = v8::Global::new(scope, context);
}
isolate
};
// 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()
};
global_context.open(&mut isolate).set_slot(
&mut isolate,
Rc::new(RefCell::new(ContextState {
op_ctxs,
..Default::default()
})),
);
op_state.borrow_mut().put(isolate_ptr);
let inspector = if options.inspector {
Some(JsRuntimeInspector::new(
&mut isolate,
global_context.clone(),
options.is_main,
))
} else {
None
};
let loader = options
.module_loader
.unwrap_or_else(|| Rc::new(NoopModuleLoader));
#[cfg(feature = "include_js_files_for_snapshotting")]
if snapshot_options.will_snapshot() {
for source in options
.extensions
.iter()
.flat_map(|e| vec![e.get_esm_sources(), e.get_js_sources()])
.flatten()
.flatten()
{
use crate::ExtensionFileSourceCode;
if let ExtensionFileSourceCode::LoadedFromFsDuringSnapshot(path) =
&source.code
{
println!("cargo:rerun-if-changed={}", path.display())
}
}
}
let num_extensions = options.extensions.len();
let extensions = Rc::new(RefCell::new(options.extensions));
let ext_loader = Rc::new(crate::modules::ExtModuleLoader::new(
Some(loader.clone()),
extensions.clone(),
options.snapshot_module_load_cb,
));
{
let mut state = state_rc.borrow_mut();
state.global_realm = Some(JsRealm::new(global_context.clone()));
state.inspector = inspector;
state
.known_realms
.push(v8::Weak::new(&mut isolate, &global_context));
}
isolate.set_data(
Self::STATE_DATA_OFFSET,
Rc::into_raw(state_rc.clone()) as *mut c_void,
);
let module_map_rc =
Rc::new(RefCell::new(ModuleMap::new(ext_loader, op_state)));
if let Some(snapshotted_data) = maybe_snapshotted_data {
let scope =
&mut v8::HandleScope::with_context(&mut isolate, global_context);
let mut module_map = module_map_rc.borrow_mut();
module_map.update_with_snapshotted_data(scope, snapshotted_data);
}
isolate.set_data(
Self::MODULE_MAP_DATA_OFFSET,
Rc::into_raw(module_map_rc.clone()) as *mut c_void,
);
let mut js_runtime = Self {
v8_isolate: Some(isolate),
snapshot_options,
allocations: IsolateAllocations::default(),
event_loop_middlewares: Vec::with_capacity(num_extensions),
extensions,
state: state_rc,
module_map: Some(module_map_rc.clone()),
is_main: options.is_main,
};
// Init resources and ops before extensions to make sure they are
// available during the initialization process.
js_runtime.init_extension_ops().unwrap();
let realm = js_runtime.global_realm();
module_map_rc.borrow().loader.allow_ext_resolution();
js_runtime.init_extension_js(&realm).unwrap();
module_map_rc.borrow().loader.disallow_ext_resolution();
js_runtime
}
fn drop_state_and_module_map(v8_isolate: &mut OwnedIsolate) {
let state_ptr = v8_isolate.get_data(Self::STATE_DATA_OFFSET);
let state_rc =
// SAFETY: We are sure that it's a valid pointer for whole lifetime of
// the runtime.
unsafe { Rc::from_raw(state_ptr as *const RefCell<JsRuntimeState>) };
drop(state_rc);
let module_map_ptr = v8_isolate.get_data(Self::MODULE_MAP_DATA_OFFSET);
let module_map_rc =
// SAFETY: We are sure that it's a valid pointer for whole lifetime of
// the runtime.
unsafe { Rc::from_raw(module_map_ptr as *const RefCell<ModuleMap>) };
drop(module_map_rc);
}
#[inline]
fn get_module_map(&mut self) -> &Rc<RefCell<ModuleMap>> {
self.module_map.as_ref().unwrap()
}
#[inline]
pub fn global_context(&mut self) -> v8::Global<v8::Context> {
let state = self.state.borrow();
let global_realm = state.global_realm.as_ref().unwrap();
global_realm.context().clone()
}
#[inline]
pub fn v8_isolate(&mut self) -> &mut v8::OwnedIsolate {
self.v8_isolate.as_mut().unwrap()
}
#[inline]
pub fn inspector(&mut self) -> Rc<RefCell<JsRuntimeInspector>> {
self.state.borrow().inspector()
}
#[inline]
pub fn global_realm(&mut self) -> JsRealm {
let state = self.state.borrow();
state.global_realm.clone().unwrap()
}
/// 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 realm_idx = self.state.borrow().known_realms.len() as u16;
let op_ctxs: Box<[OpCtx]> = self
.global_realm()
.state(self.v8_isolate())
.borrow()
.op_ctxs
.iter()
.map(|op_ctx| {
OpCtx::new(
op_ctx.id,
realm_idx,
op_ctx.decl.clone(),
op_ctx.state.clone(),
op_ctx.runtime_state.clone(),
)
})
.collect();
// 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 scope = &mut v8::HandleScope::new(unsafe {
&mut *(self.v8_isolate() as *mut v8::OwnedIsolate)
});
let context =
bindings::initialize_context(scope, &op_ctxs, self.snapshot_options);
context.set_slot(
scope,
Rc::new(RefCell::new(ContextState {
op_ctxs,
..Default::default()
})),
);
self
.state
.borrow_mut()
.known_realms
.push(v8::Weak::new(scope, context));
JsRealm::new(v8::Global::new(scope, context))
};
self
.module_map
.as_ref()
.unwrap()
.borrow()
.loader
.allow_ext_resolution();
self.init_extension_js(&realm)?;
self
.module_map
.as_ref()
.unwrap()
.borrow()
.loader
.disallow_ext_resolution();
Ok(realm)
}
#[inline]
pub fn handle_scope(&mut self) -> v8::HandleScope {
self.global_realm().handle_scope(self.v8_isolate())
}
fn setup_isolate(mut isolate: v8::OwnedIsolate) -> v8::OwnedIsolate {
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,
);
isolate
}
pub(crate) fn state(isolate: &v8::Isolate) -> Rc<RefCell<JsRuntimeState>> {
let state_ptr = isolate.get_data(Self::STATE_DATA_OFFSET);
let state_rc =
// SAFETY: We are sure that it's a valid pointer for whole lifetime of
// the runtime.
unsafe { Rc::from_raw(state_ptr as *const RefCell<JsRuntimeState>) };
let state = state_rc.clone();
Rc::into_raw(state_rc);
state
}
pub(crate) fn module_map(isolate: &v8::Isolate) -> Rc<RefCell<ModuleMap>> {
let module_map_ptr = isolate.get_data(Self::MODULE_MAP_DATA_OFFSET);
let module_map_rc =
// SAFETY: We are sure that it's a valid pointer for whole lifetime of
// the runtime.
unsafe { Rc::from_raw(module_map_ptr as *const RefCell<ModuleMap>) };
let module_map = module_map_rc.clone();
Rc::into_raw(module_map_rc);
module_map
}
/// Initializes JS of provided Extensions in the given realm
fn init_extension_js(&mut self, realm: &JsRealm) -> Result<(), Error> {
fn load_and_evaluate_module(
runtime: &mut JsRuntime,
file_source: &ExtensionFileSource,
) -> Result<(), Error> {
futures::executor::block_on(async {
let id = runtime
.load_side_module(
&ModuleSpecifier::parse(file_source.specifier)?,
None,
)
.await?;
let receiver = runtime.mod_evaluate(id);
runtime.run_event_loop(false).await?;
receiver.await?
})
.with_context(|| format!("Couldn't execute '{}'", file_source.specifier))
}
// Take extensions to avoid double-borrow
let extensions = std::mem::take(&mut self.extensions);
for ext in extensions.borrow().iter() {
{
if let Some(esm_files) = ext.get_esm_sources() {
if let Some(entry_point) = ext.get_esm_entry_point() {
let file_source = esm_files
.iter()
.find(|file| file.specifier == entry_point)
.unwrap();
load_and_evaluate_module(self, file_source)?;
} else {
for file_source in esm_files {
load_and_evaluate_module(self, file_source)?;
}
}
}
}
{
if let Some(js_files) = ext.get_js_sources() {
for file_source in js_files {
realm.execute_script(
self.v8_isolate(),
file_source.specifier,
file_source.load()?,
)?;
}
}
}
// TODO(bartlomieju): this not great that we need to have this conditional
// here, but I haven't found a better way to do it yet.
if ext.is_core {
self.init_cbs(realm);
}
}
// Restore extensions
self.extensions = extensions;
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
exts
.iter_mut()
.filter_map(|e| e.init_ops())
.flatten()
.map(|d| OpDecl {
name: d.name,
..macroware(d)
})
.collect()
}
/// Initializes ops of provided Extensions
fn init_extension_ops(&mut self) -> Result<(), Error> {
let op_state = self.op_state();
// Setup state
for e in self.extensions.borrow_mut().iter_mut() {
// ops are already registered during in bindings::initialize_context();
e.init_state(&mut op_state.borrow_mut());
// Setup event-loop middleware
if let Some(middleware) = e.init_event_loop_middleware() {
self.event_loop_middlewares.push(middleware);
}
}
Ok(())
}
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.state(self.v8_isolate());
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.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
}
/// Takes a snapshot. The isolate should have been created with will_snapshot
/// set to true.
///
/// `Error` can usually be downcast to `JsError`.
pub fn snapshot(mut self) -> v8::StartupData {
self.state.borrow_mut().inspector.take();
// 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 = {
let module_map_rc = self.module_map.take().unwrap();
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,
);
}
// Drop existing ModuleMap to drop v8::Global handles
{
let v8_isolate = self.v8_isolate();
Self::drop_state_and_module_map(v8_isolate);
}
// Drop other v8::Global handles before snapshotting
{
for weak_context in &self.state.clone().borrow().known_realms {
let scope = &mut self.handle_scope();
if let Some(context) = weak_context.to_local(scope) {
let realm = JsRealmLocal::new(context);
let realm_state_rc = realm.state(scope);
let mut realm_state = realm_state_rc.borrow_mut();
std::mem::take(&mut realm_state.js_event_loop_tick_cb);
std::mem::take(&mut realm_state.js_build_custom_error_cb);
std::mem::take(&mut realm_state.js_promise_reject_cb);
std::mem::take(&mut realm_state.js_format_exception_cb);
std::mem::take(&mut realm_state.js_wasm_streaming_cb);
context.clear_all_slots(scope);
}
}
let mut state = self.state.borrow_mut();
state.known_realms.clear();
state.global_realm.take();
}
let snapshot_creator = self.v8_isolate.take().unwrap();
snapshot_creator
.create_blob(v8::FunctionCodeHandling::Keep)
.unwrap()
}
/// 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> {
let module_map_rc = Self::module_map(self.v8_isolate());
let module_handle = module_map_rc
.borrow()
.get_handle(module_id)
.expect("ModuleInfo not found");
let scope = &mut self.handle_scope();
let module = module_handle.open(scope);
if module.get_status() == v8::ModuleStatus::Errored {
let exception = module.get_exception();
return exception_to_err_result(scope, exception, false);
}
assert!(matches!(
module.get_status(),
v8::ModuleStatus::Instantiated | v8::ModuleStatus::Evaluated
));
let module_namespace: v8::Local<v8::Object> =
v8::Local::try_from(module.get_module_namespace())
.map_err(|err: v8::DataError| generic_error(err.to_string()))?;
Ok(v8::Global::new(scope, module_namespace))
}
/// 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.state.borrow().inspector.is_some() {
return;
}
let global_context = self.global_context();
let mut state = self.state.borrow_mut();
state.inspector = Some(JsRuntimeInspector::new(
self.v8_isolate.as_mut().unwrap(),
global_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.state.borrow();
has_inspector = state.inspector.is_some();
state.waker.register(cx.waker());
}
if has_inspector {
// We poll the inspector first.
let _ = self.inspector().borrow().poll_sessions(Some(cx)).unwrap();
}
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.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.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 state.have_unpolled_ops
|| pending_state.has_pending_background_tasks
|| pending_state.has_tick_scheduled
|| maybe_scheduling
{
state.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 = 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.state.borrow().dyn_module_evaluate_idle_counter >= 1 {
let scope = &mut self.handle_scope();
let messages = 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.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.waker.wake();
}
}
Poll::Pending
}
fn event_loop_pending_state(&mut self) -> EventLoopPendingState {
let isolate = self.v8_isolate.as_mut().unwrap();
let mut scope = v8::HandleScope::new(isolate);
EventLoopPendingState::new(
&mut scope,
&mut self.state.borrow_mut(),
&self.module_map.as_ref().unwrap().borrow(),
)
}
pub(crate) fn event_loop_pending_state_from_scope(
scope: &mut v8::HandleScope,
) -> EventLoopPendingState {
let state = Self::state(scope);
let module_map = Self::module_map(scope);
let state = EventLoopPendingState::new(
scope,
&mut state.borrow_mut(),
&module_map.borrow(),
);
state
}
}
fn get_stalled_top_level_await_message_for_module(
scope: &mut v8::HandleScope,
module_id: ModuleId,
) -> Vec<v8::Global<v8::Message>> {
let module_map = JsRuntime::module_map(scope);
let module_map = module_map.borrow();
let module_handle = module_map.handles.get(module_id).unwrap();
let module = v8::Local::new(scope, module_handle);
let stalled = module.get_stalled_top_level_await_message(scope);
let mut messages = vec![];
for (_, message) in stalled {
messages.push(v8::Global::new(scope, message));
}
messages
}
fn find_stalled_top_level_await(
scope: &mut v8::HandleScope,
) -> Vec<v8::Global<v8::Message>> {
let module_map = JsRuntime::module_map(scope);
let module_map = module_map.borrow();
// First check if that's root module
let root_module_id = module_map
.info
.iter()
.filter(|m| m.main)
.map(|m| m.id)
.next();
if let Some(root_module_id) = root_module_id {
let messages =
get_stalled_top_level_await_message_for_module(scope, root_module_id);
if !messages.is_empty() {
return messages;
}
}
// It wasn't a top module, so iterate over all modules and try to find
// any with stalled top level await
for module_id in 0..module_map.handles.len() {
let messages =
get_stalled_top_level_await_message_for_module(scope, module_id);
if !messages.is_empty() {
return messages;
}
}
unreachable!()
}
#[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;
if state.known_realms.len() == 1 {
let realm = state.global_realm.as_ref().unwrap();
num_unrefed_ops += realm.state(scope).borrow().unrefed_ops.len();
} else {
for weak_context in &state.known_realms {
if let Some(context) = weak_context.to_local(scope) {
let realm = JsRealmLocal::new(context);
num_unrefed_ops += realm.state(scope).borrow().unrefed_ops.len();
}
}
}
EventLoopPendingState {
has_pending_refed_ops: state.pending_ops.len() > 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.waker.wake();
}
}
pub(crate) fn exception_to_err_result<T>(
scope: &mut v8::HandleScope,
exception: v8::Local<v8::Value>,
in_promise: bool,
) -> Result<T, Error> {
let state_rc = JsRuntime::state(scope);
let was_terminating_execution = scope.is_execution_terminating();
// Disable running microtasks for a moment. When upgrading to V8 v11.4
// we discovered that canceling termination here will cause the queued
// microtasks to run which breaks some tests.
scope.set_microtasks_policy(v8::MicrotasksPolicy::Explicit);
// If TerminateExecution was called, cancel isolate termination so that the
// exception can be created. Note that `scope.is_execution_terminating()` may
// have returned false if TerminateExecution was indeed called but there was
// no JS to execute after the call.
scope.cancel_terminate_execution();
let mut exception = exception;
{
// If termination is the result of a `op_dispatch_exception` call, we want
// to use the exception that was passed to it rather than the exception that
// was passed to this function.
let state = state_rc.borrow();
exception = if let Some(exception) = &state.dispatched_exception {
v8::Local::new(scope, exception.clone())
} else if was_terminating_execution && exception.is_null_or_undefined() {
let message = v8::String::new(scope, "execution terminated").unwrap();
v8::Exception::error(scope, message)
} else {
exception
};
}
let mut js_error = JsError::from_v8_exception(scope, exception);
if in_promise {
js_error.exception_message = format!(
"Uncaught (in promise) {}",
js_error.exception_message.trim_start_matches("Uncaught ")
);
}
if was_terminating_execution {
// Resume exception termination.
scope.terminate_execution();
}
scope.set_microtasks_policy(v8::MicrotasksPolicy::Auto);
Err(js_error.into())
}
// Related to module loading
impl JsRuntime {
pub(crate) fn instantiate_module(
&mut self,
id: ModuleId,
) -> Result<(), v8::Global<v8::Value>> {
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 {
return Err(v8::Global::new(tc_scope, module.get_exception()));
}
// 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();
return Err(v8::Global::new(tc_scope, exception));
}
Ok(())
}
fn dynamic_import_module_evaluate(
&mut self,
load_id: ModuleLoadId,
id: ModuleId,
) -> Result<(), Error> {
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.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.state.borrow_mut().global_realm.clone().unwrap();
let scope =
&mut global_realm.handle_scope(self.v8_isolate.as_mut().unwrap());
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
.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.state.clone();
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");
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
.state(tc_scope)
.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(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.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.state.clone();
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.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
.get_module_map()
.borrow()
.preparing_dynamic_imports
.is_empty()
{
return Poll::Ready(Ok(()));
}
let module_map_rc = self.get_module_map().clone();
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) => {
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
.get_module_map()
.borrow()
.pending_dynamic_imports
.is_empty()
{
return Poll::Ready(Ok(()));
}
let module_map_rc = self.get_module_map().clone();
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((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
module_map_rc
.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.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.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.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.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(self.v8_isolate());
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(self.v8_isolate());
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.state.clone();
let scope = &mut self.handle_scope();
let state = state.borrow();
for weak_context in &state.known_realms {
if let Some(context) = weak_context.to_local(scope) {
JsRealmLocal::new(context).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> {
// We have a specialized implementation of this method for the common case
// where there is only one realm.
let num_realms = self.state.borrow().known_realms.len();
if num_realms == 1 {
return self.do_single_realm_js_event_loop_tick(cx);
}
// `responses_per_realm[idx]` is a vector containing the promise ID and
// response for all promises in realm `self.state.known_realms[idx]`.
let mut responses_per_realm: Vec<Vec<(PromiseId, OpResult)>> =
(0..num_realms).map(|_| vec![]).collect();
// Now handle actual ops.
{
let mut state = self.state.borrow_mut();
state.have_unpolled_ops = false;
while let Poll::Ready(Some(item)) = state.pending_ops.poll_next_unpin(cx)
{
let (realm_idx, promise_id, op_id, resp) = item;
state.op_state.borrow().tracker.track_async_completed(op_id);
responses_per_realm[realm_idx as usize].push((promise_id, resp));
}
}
// Handle responses for each realm.
let isolate = self.v8_isolate.as_mut().unwrap();
for (realm_idx, responses) in responses_per_realm.into_iter().enumerate() {
let realm = {
let context = self.state.borrow().known_realms[realm_idx]
.to_global(isolate)
.unwrap();
JsRealm::new(context)
};
let context_state_rc = realm.state(isolate);
let mut context_state = context_state_rc.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(responses.len() * 2 + 2);
for (promise_id, mut resp) in responses {
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.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(())
}
fn do_single_realm_js_event_loop_tick(
&mut self,
cx: &mut Context,
) -> Result<(), Error> {
let isolate = self.v8_isolate.as_mut().unwrap();
let scope = &mut self
.state
.borrow()
.global_realm
.as_ref()
.unwrap()
.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::new();
// Now handle actual ops.
{
let mut state = self.state.borrow_mut();
state.have_unpolled_ops = false;
let realm_state_rc = state.global_realm.as_ref().unwrap().state(scope);
let mut realm_state = realm_state_rc.borrow_mut();
while let Poll::Ready(Some(item)) = state.pending_ops.poll_next_unpin(cx)
{
let (realm_idx, promise_id, op_id, mut resp) = item;
debug_assert_eq!(
state.known_realms[realm_idx as usize],
state.global_realm.as_ref().unwrap().context()
);
realm_state.unrefed_ops.remove(&promise_id);
state.op_state.borrow().tracker.track_async_completed(op_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.state.borrow().has_tick_scheduled);
args.push(has_tick_scheduled.into());
let js_event_loop_tick_cb_handle = {
let state = self.state.borrow_mut();
let realm_state_rc = state.global_realm.as_ref().unwrap().state(scope);
let handle = realm_state_rc
.borrow()
.js_event_loop_tick_cb
.clone()
.unwrap();
handle
};
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();
js_event_loop_tick_cb.call(tc_scope, this, args.as_slice());
if let Some(exception) = tc_scope.exception() {
return exception_to_err_result(tc_scope, exception, false);
}
if tc_scope.has_terminated() || tc_scope.is_execution_terminating() {
return Ok(());
}
Ok(())
}
}
#[inline]
pub fn queue_fast_async_op<R: serde::Serialize + 'static>(
ctx: &OpCtx,
promise_id: PromiseId,
op: impl Future<Output = Result<R, Error>> + 'static,
) {
let runtime_state = match ctx.runtime_state.upgrade() {
Some(rc_state) => rc_state,
// atleast 1 Rc is held by the JsRuntime.
None => unreachable!(),
};
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
let fut = op
.map(|result| crate::_ops::to_op_result(get_class, result))
.boxed_local();
let mut state = runtime_state.borrow_mut();
state
.pending_ops
.push(OpCall::pending(ctx, promise_id, fut));
state.have_unpolled_ops = true;
}
#[inline]
pub fn map_async_op1<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = Result<R, Error>> + 'static,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
let fut = op
.map(|result| crate::_ops::to_op_result(get_class, result))
.boxed_local();
MaybeDone::Future(fut)
}
#[inline]
pub fn map_async_op2<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: impl Future<Output = R> + 'static,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
let fut = op.map(|result| OpResult::Ok(result.into())).boxed_local();
MaybeDone::Future(fut)
}
#[inline]
pub fn map_async_op3<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = Result<R, Error>> + 'static, Error>,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
match op {
Err(err) => MaybeDone::Done(OpResult::Err(OpError::new(get_class, err))),
Ok(fut) => MaybeDone::Future(
fut
.map(|result| crate::_ops::to_op_result(get_class, result))
.boxed_local(),
),
}
}
#[inline]
pub fn map_async_op4<R: serde::Serialize + 'static>(
ctx: &OpCtx,
op: Result<impl Future<Output = R> + 'static, Error>,
) -> MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>> {
let get_class = {
let state = RefCell::borrow(&ctx.state);
state.tracker.track_async(ctx.id);
state.get_error_class_fn
};
match op {
Err(err) => MaybeDone::Done(OpResult::Err(OpError::new(get_class, err))),
Ok(fut) => MaybeDone::Future(
fut.map(|result| OpResult::Ok(result.into())).boxed_local(),
),
}
}
pub fn queue_async_op<'s>(
ctx: &OpCtx,
scope: &'s mut v8::HandleScope,
deferred: bool,
promise_id: PromiseId,
mut op: MaybeDone<Pin<Box<dyn Future<Output = OpResult>>>>,
) -> Option<v8::Local<'s, v8::Value>> {
let runtime_state = match ctx.runtime_state.upgrade() {
Some(rc_state) => rc_state,
// atleast 1 Rc is held by the JsRuntime.
None => unreachable!(),
};
// An op's realm (as given by `OpCtx::realm_idx`) must match the realm in
// which it is invoked. Otherwise, we might have cross-realm object exposure.
// deno_core doesn't currently support such exposure, even though embedders
// can cause them, so we panic in debug mode (since the check is expensive).
debug_assert_eq!(
runtime_state.borrow().known_realms[ctx.realm_idx as usize].to_local(scope),
Some(scope.get_current_context())
);
// All ops are polled immediately
let waker = noop_waker();
let mut cx = Context::from_waker(&waker);
// Note that MaybeDone returns () from the future
let op_call = match op.poll_unpin(&mut cx) {
Poll::Pending => {
let MaybeDone::Future(fut) = op else {
unreachable!()
};
OpCall::pending(ctx, promise_id, fut)
}
Poll::Ready(_) => {
let mut op_result = Pin::new(&mut op).take_output().unwrap();
// If the op is ready and is not marked as deferred we can immediately return
// the result.
if !deferred {
ctx.state.borrow_mut().tracker.track_async_completed(ctx.id);
return Some(op_result.to_v8(scope).unwrap());
}
OpCall::ready(ctx, promise_id, op_result)
}
};
// Otherwise we will push it to the `pending_ops` and let it be polled again
// or resolved on the next tick of the event loop.
let mut state = runtime_state.borrow_mut();
state.pending_ops.push(op_call);
state.have_unpolled_ops = true;
None
}
#[cfg(test)]
pub mod tests {
use super::*;
use crate::ascii_str;
use crate::error::custom_error;
use crate::error::AnyError;
use crate::include_ascii_string;
use crate::modules::AssertedModuleType;
use crate::modules::ModuleInfo;
use crate::modules::ModuleSource;
use crate::modules::ModuleSourceFuture;
use crate::modules::ModuleType;
use crate::modules::ResolutionKind;
use crate::modules::SymbolicModule;
use crate::ZeroCopyBuf;
use deno_ops::op;
use std::pin::Pin;
use std::rc::Rc;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering;
use std::sync::Arc;
// deno_ops macros generate code assuming deno_core in scope.
mod deno_core {
pub use crate::*;
}
#[derive(Copy, Clone)]
pub enum Mode {
Async,
AsyncDeferred,
AsyncZeroCopy(bool),
}
struct TestState {
mode: Mode,
dispatch_count: Arc<AtomicUsize>,
}
#[op]
async fn op_test(
rc_op_state: Rc<RefCell<OpState>>,
control: u8,
buf: Option<ZeroCopyBuf>,
) -> Result<u8, AnyError> {
#![allow(clippy::await_holding_refcell_ref)] // False positive.
let op_state_ = rc_op_state.borrow();
let test_state = op_state_.borrow::<TestState>();
test_state.dispatch_count.fetch_add(1, Ordering::Relaxed);
let mode = test_state.mode;
drop(op_state_);
match mode {
Mode::Async => {
assert_eq!(control, 42);
Ok(43)
}
Mode::AsyncDeferred => {
tokio::task::yield_now().await;
assert_eq!(control, 42);
Ok(43)
}
Mode::AsyncZeroCopy(has_buffer) => {
assert_eq!(buf.is_some(), has_buffer);
if let Some(buf) = buf {
assert_eq!(buf.len(), 1);
}
Ok(43)
}
}
}
fn setup(mode: Mode) -> (JsRuntime, Arc<AtomicUsize>) {
let dispatch_count = Arc::new(AtomicUsize::new(0));
deno_core::extension!(
test_ext,
ops = [op_test],
options = {
mode: Mode,
dispatch_count: Arc<AtomicUsize>,
},
state = |state, options| {
state.put(TestState {
mode: options.mode,
dispatch_count: options.dispatch_count
})
}
);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops(mode, dispatch_count.clone())],
get_error_class_fn: Some(&|error| {
crate::error::get_custom_error_class(error).unwrap()
}),
..Default::default()
});
runtime
.execute_script_static(
"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_ref_unref_ops() {
let (mut runtime, _dispatch_count) = setup(Mode::AsyncDeferred);
runtime
.execute_script_static(
"filename.js",
r#"
var promiseIdSymbol = Symbol.for("Deno.core.internalPromiseId");
var p1 = Deno.core.opAsync("op_test", 42);
var p2 = Deno.core.opAsync("op_test", 42);
"#,
)
.unwrap();
{
let realm = runtime.global_realm();
let isolate = runtime.v8_isolate();
let state_rc = JsRuntime::state(isolate);
assert_eq!(state_rc.borrow().pending_ops.len(), 2);
assert_eq!(realm.state(isolate).borrow().unrefed_ops.len(), 0);
}
runtime
.execute_script_static(
"filename.js",
r#"
Deno.core.ops.op_unref_op(p1[promiseIdSymbol]);
Deno.core.ops.op_unref_op(p2[promiseIdSymbol]);
"#,
)
.unwrap();
{
let realm = runtime.global_realm();
let isolate = runtime.v8_isolate();
let state_rc = JsRuntime::state(isolate);
assert_eq!(state_rc.borrow().pending_ops.len(), 2);
assert_eq!(realm.state(isolate).borrow().unrefed_ops.len(), 2);
}
runtime
.execute_script_static(
"filename.js",
r#"
Deno.core.ops.op_ref_op(p1[promiseIdSymbol]);
Deno.core.ops.op_ref_op(p2[promiseIdSymbol]);
"#,
)
.unwrap();
{
let realm = runtime.global_realm();
let isolate = runtime.v8_isolate();
let state_rc = JsRuntime::state(isolate);
assert_eq!(state_rc.borrow().pending_ops.len(), 2);
assert_eq!(realm.state(isolate).borrow().unrefed_ops.len(), 0);
}
}
#[test]
fn test_dispatch() {
let (mut runtime, dispatch_count) = setup(Mode::Async);
runtime
.execute_script_static(
"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_op_async_promise_id() {
let (mut runtime, _dispatch_count) = setup(Mode::Async);
runtime
.execute_script_static(
"filename.js",
r#"
const p = Deno.core.opAsync("op_test", 42);
if (p[Symbol.for("Deno.core.internalPromiseId")] == undefined) {
throw new Error("missing id on returned promise");
}
"#,
)
.unwrap();
}
#[test]
fn test_dispatch_no_zero_copy_buf() {
let (mut runtime, dispatch_count) = setup(Mode::AsyncZeroCopy(false));
runtime
.execute_script_static(
"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_script_static(
"filename.js",
r#"
const { op_test } = Deno.core.generateAsyncOpHandler("op_test");
let zero_copy_a = new Uint8Array([0]);
op_test(null, zero_copy_a);
"#,
)
.unwrap();
assert_eq!(dispatch_count.load(Ordering::Relaxed), 1);
}
#[test]
fn test_execute_script_return_value() {
let mut runtime = JsRuntime::new(Default::default());
let value_global =
runtime.execute_script_static("a.js", "a = 1 + 2").unwrap();
{
let scope = &mut runtime.handle_scope();
let value = value_global.open(scope);
assert_eq!(value.integer_value(scope).unwrap(), 3);
}
let value_global = runtime
.execute_script_static("b.js", "b = 'foobar'")
.unwrap();
{
let scope = &mut runtime.handle_scope();
let value = value_global.open(scope);
assert!(value.is_string());
assert_eq!(
value.to_string(scope).unwrap().to_rust_string_lossy(scope),
"foobar"
);
}
}
#[tokio::test]
async fn test_poll_value() {
let mut runtime = JsRuntime::new(Default::default());
poll_fn(move |cx| {
let value_global = runtime
.execute_script_static("a.js", "Promise.resolve(1 + 2)")
.unwrap();
let v = runtime.poll_value(&value_global, cx);
{
let scope = &mut runtime.handle_scope();
assert!(
matches!(v, Poll::Ready(Ok(v)) if v.open(scope).integer_value(scope).unwrap() == 3)
);
}
let value_global = runtime
.execute_script_static(
"a.js",
"Promise.resolve(new Promise(resolve => resolve(2 + 2)))",
)
.unwrap();
let v = runtime.poll_value(&value_global, cx);
{
let scope = &mut runtime.handle_scope();
assert!(
matches!(v, Poll::Ready(Ok(v)) if v.open(scope).integer_value(scope).unwrap() == 4)
);
}
let value_global = runtime
.execute_script_static("a.js", "Promise.reject(new Error('fail'))")
.unwrap();
let v = runtime.poll_value(&value_global, cx);
assert!(
matches!(v, Poll::Ready(Err(e)) if e.downcast_ref::<JsError>().unwrap().exception_message == "Uncaught Error: fail")
);
let value_global = runtime
.execute_script_static("a.js", "new Promise(resolve => {})")
.unwrap();
let v = runtime.poll_value(&value_global, cx);
matches!(v, Poll::Ready(Err(e)) if e.to_string() == "Promise resolution is still pending but the event loop has already resolved.");
Poll::Ready(())
}).await;
}
#[tokio::test]
async fn test_resolve_value() {
let mut runtime = JsRuntime::new(Default::default());
let value_global = runtime
.execute_script_static("a.js", "Promise.resolve(1 + 2)")
.unwrap();
let result_global = runtime.resolve_value(value_global).await.unwrap();
{
let scope = &mut runtime.handle_scope();
let value = result_global.open(scope);
assert_eq!(value.integer_value(scope).unwrap(), 3);
}
let value_global = runtime
.execute_script_static(
"a.js",
"Promise.resolve(new Promise(resolve => resolve(2 + 2)))",
)
.unwrap();
let result_global = runtime.resolve_value(value_global).await.unwrap();
{
let scope = &mut runtime.handle_scope();
let value = result_global.open(scope);
assert_eq!(value.integer_value(scope).unwrap(), 4);
}
let value_global = runtime
.execute_script_static("a.js", "Promise.reject(new Error('fail'))")
.unwrap();
let err = runtime.resolve_value(value_global).await.unwrap_err();
assert_eq!(
"Uncaught Error: fail",
err.downcast::<JsError>().unwrap().exception_message
);
let value_global = runtime
.execute_script_static("a.js", "new Promise(resolve => {})")
.unwrap();
let error_string = runtime
.resolve_value(value_global)
.await
.unwrap_err()
.to_string();
assert_eq!(
"Promise resolution is still pending but the event loop has already resolved.",
error_string,
);
}
#[test]
fn terminate_execution_webassembly() {
let (mut runtime, _dispatch_count) = setup(Mode::Async);
let v8_isolate_handle = runtime.v8_isolate().thread_safe_handle();
// Run an infinite loop in Webassemby code, which should be terminated.
let promise = runtime.execute_script_static("infinite_wasm_loop.js",
r#"
(async () => {
const wasmCode = new Uint8Array([
0, 97, 115, 109, 1, 0, 0, 0, 1, 4, 1,
96, 0, 0, 3, 2, 1, 0, 7, 17, 1, 13,
105, 110, 102, 105, 110, 105, 116, 101, 95, 108, 111,
111, 112, 0, 0, 10, 9, 1, 7, 0, 3, 64,
12, 0, 11, 11,
]);
const wasmModule = await WebAssembly.compile(wasmCode);
globalThis.wasmInstance = new WebAssembly.Instance(wasmModule);
})()
"#).unwrap();
futures::executor::block_on(runtime.resolve_value(promise)).unwrap();
let terminator_thread = std::thread::spawn(move || {
std::thread::sleep(std::time::Duration::from_millis(1000));
// terminate execution
let ok = v8_isolate_handle.terminate_execution();
assert!(ok);
});
let err = runtime
.execute_script_static(
"infinite_wasm_loop2.js",
"globalThis.wasmInstance.exports.infinite_loop();",
)
.unwrap_err();
assert_eq!(err.to_string(), "Uncaught Error: execution terminated");
// Cancel the execution-terminating exception in order to allow script
// execution again.
let ok = runtime.v8_isolate().cancel_terminate_execution();
assert!(ok);
// Verify that the isolate usable again.
runtime
.execute_script_static("simple.js", "1 + 1")
.expect("execution should be possible again");
terminator_thread.join().unwrap();
}
#[test]
fn terminate_execution() {
let (mut isolate, _dispatch_count) = setup(Mode::Async);
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_script_static("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_script_static("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);
runtime.v8_isolate().thread_safe_handle()
};
// this should not SEGFAULT
v8_isolate_handle.terminate_execution();
}
#[test]
fn syntax_error() {
let mut runtime = JsRuntime::new(Default::default());
let src = "hocuspocus(";
let r = runtime.execute_script_static("i.js", src);
let e = r.unwrap_err();
let js_error = e.downcast::<JsError>().unwrap();
let frame = js_error.frames.first().unwrap();
assert_eq!(frame.column_number, Some(12));
}
#[tokio::test]
async fn test_encode_decode() {
let (mut runtime, _dispatch_count) = setup(Mode::Async);
poll_fn(move |cx| {
runtime
.execute_script(
"encode_decode_test.js",
// Note: We make this to_owned because it contains non-ASCII chars
include_str!("encode_decode_test.js").to_owned().into(),
)
.unwrap();
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(cx, false) {
unreachable!();
}
Poll::Ready(())
})
.await;
}
#[tokio::test]
async fn test_serialize_deserialize() {
let (mut runtime, _dispatch_count) = setup(Mode::Async);
poll_fn(move |cx| {
runtime
.execute_script(
"serialize_deserialize_test.js",
include_ascii_string!("serialize_deserialize_test.js"),
)
.unwrap();
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(cx, false) {
unreachable!();
}
Poll::Ready(())
})
.await;
}
#[tokio::test]
async fn test_error_builder() {
#[op]
fn op_err() -> Result<(), Error> {
Err(custom_error("DOMExceptionOperationError", "abc"))
}
pub fn get_error_class_name(_: &Error) -> &'static str {
"DOMExceptionOperationError"
}
deno_core::extension!(test_ext, ops = [op_err]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
get_error_class_fn: Some(&get_error_class_name),
..Default::default()
});
poll_fn(move |cx| {
runtime
.execute_script_static(
"error_builder_test.js",
include_str!("error_builder_test.js"),
)
.unwrap();
if let Poll::Ready(Err(_)) = runtime.poll_event_loop(cx, false) {
unreachable!();
}
Poll::Ready(())
})
.await;
}
#[test]
fn will_snapshot() {
let snapshot = {
let mut runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
..Default::default()
});
runtime.execute_script_static("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_script_static("check.js", "if (a != 3) throw Error('x')")
.unwrap();
}
#[test]
fn will_snapshot2() {
let startup_data = {
let mut runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
..Default::default()
});
runtime
.execute_script_static("a.js", "let a = 1 + 2")
.unwrap();
runtime.snapshot()
};
let snapshot = Snapshot::JustCreated(startup_data);
let mut runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
startup_snapshot: Some(snapshot),
..Default::default()
});
let startup_data = {
runtime
.execute_script_static("check_a.js", "if (a != 3) throw Error('x')")
.unwrap();
runtime.execute_script_static("b.js", "b = 2 + 3").unwrap();
runtime.snapshot()
};
let snapshot = Snapshot::JustCreated(startup_data);
{
let mut runtime = JsRuntime::new(RuntimeOptions {
startup_snapshot: Some(snapshot),
..Default::default()
});
runtime
.execute_script_static("check_b.js", "if (b != 5) throw Error('x')")
.unwrap();
runtime
.execute_script_static("check2.js", "if (!Deno.core) throw Error('x')")
.unwrap();
}
}
#[test]
fn test_snapshot_callbacks() {
let snapshot = {
let mut runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
..Default::default()
});
runtime
.execute_script_static(
"a.js",
r#"
Deno.core.setMacrotaskCallback(() => {
return true;
});
Deno.core.ops.op_set_format_exception_callback(()=> {
return null;
})
Deno.core.setPromiseRejectCallback(() => {
return false;
});
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_script_static("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_script_static("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_script_static("check.js", "if (a != 3) throw Error('x')")
.unwrap();
}
#[test]
fn test_get_module_namespace() {
#[derive(Default)]
struct ModsLoader;
impl ModuleLoader for ModsLoader {
fn resolve(
&self,
specifier: &str,
referrer: &str,
_kind: ResolutionKind,
) -> Result<ModuleSpecifier, Error> {
assert_eq!(specifier, "file:///main.js");
assert_eq!(referrer, ".");
let s = crate::resolve_import(specifier, referrer).unwrap();
Ok(s)
}
fn load(
&self,
_module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<&ModuleSpecifier>,
_is_dyn_import: bool,
) -> Pin<Box<ModuleSourceFuture>> {
async { Err(generic_error("Module loading is not supported")) }
.boxed_local()
}
}
let loader = std::rc::Rc::new(ModsLoader::default());
let mut runtime = JsRuntime::new(RuntimeOptions {
module_loader: Some(loader),
..Default::default()
});
let specifier = crate::resolve_url("file:///main.js").unwrap();
let source_code = ascii_str!(
r#"
export const a = "b";
export default 1 + 2;
"#
);
let module_id = futures::executor::block_on(
runtime.load_main_module(&specifier, Some(source_code)),
)
.unwrap();
#[allow(clippy::let_underscore_future)]
let _ = runtime.mod_evaluate(module_id);
let module_namespace = runtime.get_module_namespace(module_id).unwrap();
let scope = &mut runtime.handle_scope();
let module_namespace =
v8::Local::<v8::Object>::new(scope, module_namespace);
assert!(module_namespace.is_module_namespace_object());
let unknown_export_name = v8::String::new(scope, "none").unwrap();
let binding = module_namespace.get(scope, unknown_export_name.into());
assert!(binding.is_some());
assert!(binding.unwrap().is_undefined());
let empty_export_name = v8::String::new(scope, "").unwrap();
let binding = module_namespace.get(scope, empty_export_name.into());
assert!(binding.is_some());
assert!(binding.unwrap().is_undefined());
let a_export_name = v8::String::new(scope, "a").unwrap();
let binding = module_namespace.get(scope, a_export_name.into());
assert!(binding.unwrap().is_string());
assert_eq!(binding.unwrap(), v8::String::new(scope, "b").unwrap());
let default_export_name = v8::String::new(scope, "default").unwrap();
let binding = module_namespace.get(scope, default_export_name.into());
assert!(binding.unwrap().is_number());
assert_eq!(binding.unwrap(), v8::Number::new(scope, 3_f64));
}
#[test]
fn test_heap_limits() {
let create_params =
v8::Isolate::create_params().heap_limits(0, 5 * 1024 * 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::new(0));
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_static(
"script name",
r#"let s = ""; while(true) { s += "Hello"; }"#,
)
.expect_err("script should fail");
assert_eq!(
"Uncaught Error: execution terminated",
err.downcast::<JsError>().unwrap().exception_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(3 * 1024 * 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, 5 * 1024 * 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::new(0));
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::new(0));
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_static(
"script name",
r#"let s = ""; while(true) { s += "Hello"; }"#,
)
.expect_err("script should fail");
assert_eq!(
"Uncaught Error: execution terminated",
err.downcast::<JsError>().unwrap().exception_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,
specifier: &str,
referrer: &str,
_kind: ResolutionKind,
) -> Result<ModuleSpecifier, Error> {
let s = crate::resolve_import(specifier, referrer).unwrap();
Ok(s)
}
fn load(
&self,
_module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<&ModuleSpecifier>,
_is_dyn_import: bool,
) -> Pin<Box<ModuleSourceFuture>> {
eprintln!("load() should not be called");
unreachable!()
}
}
fn create_module(
runtime: &mut JsRuntime,
i: usize,
main: bool,
) -> ModuleInfo {
let specifier = crate::resolve_url(&format!("file:///{i}.js")).unwrap();
let prev = i - 1;
let source_code = format!(
r#"
import {{ f{prev} }} from "file:///{prev}.js";
export function f{i}() {{ return f{prev}() }}
"#
)
.into();
let id = if main {
futures::executor::block_on(
runtime.load_main_module(&specifier, Some(source_code)),
)
.unwrap()
} else {
futures::executor::block_on(
runtime.load_side_module(&specifier, Some(source_code)),
)
.unwrap()
};
assert_eq!(i, id);
#[allow(clippy::let_underscore_future)]
let _ = runtime.mod_evaluate(id);
futures::executor::block_on(runtime.run_event_loop(false)).unwrap();
ModuleInfo {
id,
main,
name: specifier.into(),
requests: vec![crate::modules::ModuleRequest {
specifier: format!("file:///{prev}.js"),
asserted_module_type: AssertedModuleType::JavaScriptOrWasm,
}],
module_type: ModuleType::JavaScript,
}
}
fn assert_module_map(runtime: &mut JsRuntime, modules: &Vec<ModuleInfo>) {
let module_map_rc = runtime.get_module_map();
let module_map = module_map_rc.borrow();
assert_eq!(module_map.handles.len(), modules.len());
assert_eq!(module_map.info.len(), modules.len());
assert_eq!(
module_map.by_name(AssertedModuleType::Json).len()
+ module_map
.by_name(AssertedModuleType::JavaScriptOrWasm)
.len(),
modules.len()
);
assert_eq!(module_map.next_load_id, (modules.len() + 1) as ModuleLoadId);
for info in modules {
assert!(module_map.handles.get(info.id).is_some());
assert_eq!(module_map.info.get(info.id).unwrap(), info);
assert_eq!(
module_map
.by_name(AssertedModuleType::JavaScriptOrWasm)
.get(&info.name)
.unwrap(),
&SymbolicModule::Mod(info.id)
);
}
}
#[op]
fn op_test() -> Result<String, Error> {
Ok(String::from("test"))
}
let loader = Rc::new(ModsLoader::default());
let mut runtime = JsRuntime::new(RuntimeOptions {
module_loader: Some(loader.clone()),
will_snapshot: true,
extensions: vec![Extension::builder("text_ext")
.ops(vec![op_test::decl()])
.build()],
..Default::default()
});
let specifier = crate::resolve_url("file:///0.js").unwrap();
let source_code =
ascii_str!(r#"export function f0() { return "hello world" }"#);
let id = futures::executor::block_on(
runtime.load_side_module(&specifier, Some(source_code)),
)
.unwrap();
#[allow(clippy::let_underscore_future)]
let _ = runtime.mod_evaluate(id);
futures::executor::block_on(runtime.run_event_loop(false)).unwrap();
let mut modules = vec![];
modules.push(ModuleInfo {
id,
main: false,
name: specifier.into(),
requests: vec![],
module_type: ModuleType::JavaScript,
});
modules.extend((1..200).map(|i| create_module(&mut runtime, i, false)));
assert_module_map(&mut runtime, &modules);
let snapshot = runtime.snapshot();
let mut runtime2 = JsRuntime::new(RuntimeOptions {
module_loader: Some(loader.clone()),
will_snapshot: true,
startup_snapshot: Some(Snapshot::JustCreated(snapshot)),
extensions: vec![Extension::builder("text_ext")
.ops(vec![op_test::decl()])
.build()],
..Default::default()
});
assert_module_map(&mut runtime2, &modules);
modules.extend((200..400).map(|i| create_module(&mut runtime2, i, false)));
modules.push(create_module(&mut runtime2, 400, true));
assert_module_map(&mut runtime2, &modules);
let snapshot2 = runtime2.snapshot();
let mut runtime3 = JsRuntime::new(RuntimeOptions {
module_loader: Some(loader),
startup_snapshot: Some(Snapshot::JustCreated(snapshot2)),
extensions: vec![Extension::builder("text_ext")
.ops(vec![op_test::decl()])
.build()],
..Default::default()
});
assert_module_map(&mut runtime3, &modules);
let source_code = r#"(async () => {
const mod = await import("file:///400.js");
return mod.f400() + " " + Deno.core.ops.op_test();
})();"#;
let val = runtime3.execute_script_static(".", source_code).unwrap();
let val = futures::executor::block_on(runtime3.resolve_value(val)).unwrap();
{
let scope = &mut runtime3.handle_scope();
let value = v8::Local::new(scope, val);
let str_ = value.to_string(scope).unwrap().to_rust_string_lossy(scope);
assert_eq!(str_, "hello world test");
}
}
#[test]
fn test_error_without_stack() {
let mut runtime = JsRuntime::new(RuntimeOptions::default());
// SyntaxError
let result = runtime.execute_script_static(
"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:3:15"#;
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_script_static(
"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:8:3)
at error_stack.js:10:1"#;
assert_eq!(result.unwrap_err().to_string(), expected_error);
}
#[tokio::test]
async fn test_error_async_stack() {
let mut runtime = JsRuntime::new(RuntimeOptions::default());
poll_fn(move |cx| {
runtime
.execute_script_static(
"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:9:5"#;
match runtime.poll_event_loop(cx, false) {
Poll::Ready(Err(e)) => {
assert_eq!(e.to_string(), expected_error);
}
_ => panic!(),
};
Poll::Ready(())
})
.await;
}
#[tokio::test]
async fn test_error_context() {
use anyhow::anyhow;
#[op]
fn op_err_sync() -> Result<(), Error> {
Err(anyhow!("original sync error").context("higher-level sync error"))
}
#[op]
async fn op_err_async() -> Result<(), Error> {
Err(anyhow!("original async error").context("higher-level async error"))
}
deno_core::extension!(test_ext, ops = [op_err_sync, op_err_async]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
poll_fn(move |cx| {
runtime
.execute_script_static(
"test_error_context_sync.js",
r#"
let errMessage;
try {
Deno.core.ops.op_err_sync();
} catch (err) {
errMessage = err.message;
}
if (errMessage !== "higher-level sync error: original sync error") {
throw new Error("unexpected error message from op_err_sync: " + errMessage);
}
"#,
)
.unwrap();
let promise = runtime
.execute_script_static(
"test_error_context_async.js",
r#"
(async () => {
let errMessage;
try {
await Deno.core.opAsync("op_err_async");
} catch (err) {
errMessage = err.message;
}
if (errMessage !== "higher-level async error: original async error") {
throw new Error("unexpected error message from op_err_async: " + errMessage);
}
})()
"#,
)
.unwrap();
match runtime.poll_value(&promise, cx) {
Poll::Ready(Ok(_)) => {}
Poll::Ready(Err(err)) => panic!("{err:?}"),
_ => panic!(),
}
Poll::Ready(())
}).await;
}
#[tokio::test]
async fn test_pump_message_loop() {
let mut runtime = JsRuntime::new(RuntimeOptions::default());
poll_fn(move |cx| {
runtime
.execute_script_static(
"pump_message_loop.js",
r#"
function assertEquals(a, b) {
if (a === b) return;
throw a + " does not equal " + b;
}
const sab = new SharedArrayBuffer(16);
const i32a = new Int32Array(sab);
globalThis.resolved = false;
(function() {
const result = Atomics.waitAsync(i32a, 0, 0);
result.value.then(
(value) => { assertEquals("ok", value); globalThis.resolved = true; },
() => { assertUnreachable();
});
})();
const notify_return_value = Atomics.notify(i32a, 0, 1);
assertEquals(1, notify_return_value);
"#,
)
.unwrap();
match runtime.poll_event_loop(cx, false) {
Poll::Ready(Ok(())) => {}
_ => panic!(),
};
// noop script, will resolve promise from first script
runtime
.execute_script_static(
"pump_message_loop2.js",
r#"assertEquals(1, 1);"#,
)
.unwrap();
// check that promise from `Atomics.waitAsync` has been resolved
runtime
.execute_script_static(
"pump_message_loop3.js",
r#"assertEquals(globalThis.resolved, true);"#,
)
.unwrap();
Poll::Ready(())
})
.await;
}
#[test]
fn test_v8_platform() {
let options = RuntimeOptions {
v8_platform: Some(v8::new_default_platform(0, false).make_shared()),
..Default::default()
};
let mut runtime = JsRuntime::new(options);
runtime.execute_script_static("<none>", "").unwrap();
}
#[ignore] // TODO(@littledivy): Fast API ops when snapshot is not loaded.
#[test]
fn test_is_proxy() {
let mut runtime = JsRuntime::new(RuntimeOptions::default());
let all_true: v8::Global<v8::Value> = runtime
.execute_script_static(
"is_proxy.js",
r#"
(function () {
const o = { a: 1, b: 2};
const p = new Proxy(o, {});
return Deno.core.ops.op_is_proxy(p) && !Deno.core.ops.op_is_proxy(o) && !Deno.core.ops.op_is_proxy(42);
})()
"#,
)
.unwrap();
let mut scope = runtime.handle_scope();
let all_true = v8::Local::<v8::Value>::new(&mut scope, &all_true);
assert!(all_true.is_true());
}
#[tokio::test]
async fn test_async_opstate_borrow() {
struct InnerState(u64);
#[op]
async fn op_async_borrow(
op_state: Rc<RefCell<OpState>>,
) -> Result<(), Error> {
let n = {
let op_state = op_state.borrow();
let inner_state = op_state.borrow::<InnerState>();
inner_state.0
};
// Future must be Poll::Pending on first call
tokio::time::sleep(std::time::Duration::from_millis(1)).await;
if n != 42 {
unreachable!();
}
Ok(())
}
deno_core::extension!(
test_ext,
ops = [op_async_borrow],
state = |state| state.put(InnerState(42))
);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"op_async_borrow.js",
"Deno.core.opAsync(\"op_async_borrow\")",
)
.unwrap();
runtime.run_event_loop(false).await.unwrap();
}
#[tokio::test]
async fn test_sync_op_serialize_object_with_numbers_as_keys() {
#[op]
fn op_sync_serialize_object_with_numbers_as_keys(
value: serde_json::Value,
) -> Result<(), Error> {
assert_eq!(
value.to_string(),
r#"{"lines":{"100":{"unit":"m"},"200":{"unit":"cm"}}}"#
);
Ok(())
}
deno_core::extension!(
test_ext,
ops = [op_sync_serialize_object_with_numbers_as_keys]
);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"op_sync_serialize_object_with_numbers_as_keys.js",
r#"
Deno.core.ops.op_sync_serialize_object_with_numbers_as_keys({
lines: {
100: {
unit: "m"
},
200: {
unit: "cm"
}
}
})
"#,
)
.unwrap();
runtime.run_event_loop(false).await.unwrap();
}
#[tokio::test]
async fn test_async_op_serialize_object_with_numbers_as_keys() {
#[op]
async fn op_async_serialize_object_with_numbers_as_keys(
value: serde_json::Value,
) -> Result<(), Error> {
assert_eq!(
value.to_string(),
r#"{"lines":{"100":{"unit":"m"},"200":{"unit":"cm"}}}"#
);
Ok(())
}
deno_core::extension!(
test_ext,
ops = [op_async_serialize_object_with_numbers_as_keys]
);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"op_async_serialize_object_with_numbers_as_keys.js",
r#"
Deno.core.opAsync("op_async_serialize_object_with_numbers_as_keys", {
lines: {
100: {
unit: "m"
},
200: {
unit: "cm"
}
}
})
"#,
)
.unwrap();
runtime.run_event_loop(false).await.unwrap();
}
#[tokio::test]
async fn test_set_macrotask_callback_set_next_tick_callback() {
#[op]
async fn op_async_sleep() -> Result<(), Error> {
// Future must be Poll::Pending on first call
tokio::time::sleep(std::time::Duration::from_millis(1)).await;
Ok(())
}
deno_core::extension!(test_ext, ops = [op_async_sleep]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"macrotasks_and_nextticks.js",
r#"
(async function () {
const results = [];
Deno.core.setMacrotaskCallback(() => {
results.push("macrotask");
return true;
});
Deno.core.setNextTickCallback(() => {
results.push("nextTick");
Deno.core.ops.op_set_has_tick_scheduled(false);
});
Deno.core.ops.op_set_has_tick_scheduled(true);
await Deno.core.opAsync('op_async_sleep');
if (results[0] != "nextTick") {
throw new Error(`expected nextTick, got: ${results[0]}`);
}
if (results[1] != "macrotask") {
throw new Error(`expected macrotask, got: ${results[1]}`);
}
})();
"#,
)
.unwrap();
runtime.run_event_loop(false).await.unwrap();
}
#[test]
fn test_has_tick_scheduled() {
use futures::task::ArcWake;
static MACROTASK: AtomicUsize = AtomicUsize::new(0);
static NEXT_TICK: AtomicUsize = AtomicUsize::new(0);
#[op]
fn op_macrotask() -> Result<(), AnyError> {
MACROTASK.fetch_add(1, Ordering::Relaxed);
Ok(())
}
#[op]
fn op_next_tick() -> Result<(), AnyError> {
NEXT_TICK.fetch_add(1, Ordering::Relaxed);
Ok(())
}
deno_core::extension!(test_ext, ops = [op_macrotask, op_next_tick]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"has_tick_scheduled.js",
r#"
Deno.core.setMacrotaskCallback(() => {
Deno.core.ops.op_macrotask();
return true; // We're done.
});
Deno.core.setNextTickCallback(() => Deno.core.ops.op_next_tick());
Deno.core.ops.op_set_has_tick_scheduled(true);
"#,
)
.unwrap();
struct ArcWakeImpl(Arc<AtomicUsize>);
impl ArcWake for ArcWakeImpl {
fn wake_by_ref(arc_self: &Arc<Self>) {
arc_self.0.fetch_add(1, Ordering::Relaxed);
}
}
let awoken_times = Arc::new(AtomicUsize::new(0));
let waker =
futures::task::waker(Arc::new(ArcWakeImpl(awoken_times.clone())));
let cx = &mut Context::from_waker(&waker);
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
assert_eq!(1, MACROTASK.load(Ordering::Relaxed));
assert_eq!(1, NEXT_TICK.load(Ordering::Relaxed));
assert_eq!(awoken_times.swap(0, Ordering::Relaxed), 1);
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
assert_eq!(awoken_times.swap(0, Ordering::Relaxed), 1);
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
assert_eq!(awoken_times.swap(0, Ordering::Relaxed), 1);
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
assert_eq!(awoken_times.swap(0, Ordering::Relaxed), 1);
let state_rc = JsRuntime::state(runtime.v8_isolate());
state_rc.borrow_mut().has_tick_scheduled = false;
assert!(matches!(
runtime.poll_event_loop(cx, false),
Poll::Ready(Ok(()))
));
assert_eq!(awoken_times.load(Ordering::Relaxed), 0);
assert!(matches!(
runtime.poll_event_loop(cx, false),
Poll::Ready(Ok(()))
));
assert_eq!(awoken_times.load(Ordering::Relaxed), 0);
}
#[test]
fn terminate_during_module_eval() {
#[derive(Default)]
struct ModsLoader;
impl ModuleLoader for ModsLoader {
fn resolve(
&self,
specifier: &str,
referrer: &str,
_kind: ResolutionKind,
) -> Result<ModuleSpecifier, Error> {
assert_eq!(specifier, "file:///main.js");
assert_eq!(referrer, ".");
let s = crate::resolve_import(specifier, referrer).unwrap();
Ok(s)
}
fn load(
&self,
_module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<&ModuleSpecifier>,
_is_dyn_import: bool,
) -> Pin<Box<ModuleSourceFuture>> {
async move {
Ok(ModuleSource::for_test(
"console.log('hello world');",
"file:///main.js",
))
}
.boxed_local()
}
}
let loader = std::rc::Rc::new(ModsLoader::default());
let mut runtime = JsRuntime::new(RuntimeOptions {
module_loader: Some(loader),
..Default::default()
});
let specifier = crate::resolve_url("file:///main.js").unwrap();
let source_code = ascii_str!("Deno.core.print('hello\\n')");
let module_id = futures::executor::block_on(
runtime.load_main_module(&specifier, Some(source_code)),
)
.unwrap();
runtime.v8_isolate().terminate_execution();
let mod_result =
futures::executor::block_on(runtime.mod_evaluate(module_id)).unwrap();
assert!(mod_result
.unwrap_err()
.to_string()
.contains("JavaScript execution has been terminated"));
}
#[tokio::test]
async fn test_unhandled_rejection_order() {
let mut runtime = JsRuntime::new(Default::default());
runtime
.execute_script_static(
"",
r#"
for (let i = 0; i < 100; i++) {
Promise.reject(i);
}
"#,
)
.unwrap();
let err = runtime.run_event_loop(false).await.unwrap_err();
assert_eq!(err.to_string(), "Uncaught (in promise) 0");
}
#[tokio::test]
async fn test_set_promise_reject_callback() {
static PROMISE_REJECT: AtomicUsize = AtomicUsize::new(0);
#[op]
fn op_promise_reject() -> Result<(), AnyError> {
PROMISE_REJECT.fetch_add(1, Ordering::Relaxed);
Ok(())
}
deno_core::extension!(test_ext, ops = [op_promise_reject]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"promise_reject_callback.js",
r#"
// Note: |promise| is not the promise created below, it's a child.
Deno.core.ops.op_set_promise_reject_callback((type, promise, reason) => {
if (type !== /* PromiseRejectWithNoHandler */ 0) {
throw Error("unexpected type: " + type);
}
if (reason.message !== "reject") {
throw Error("unexpected reason: " + reason);
}
Deno.core.ops.op_store_pending_promise_rejection(promise);
Deno.core.ops.op_promise_reject();
});
new Promise((_, reject) => reject(Error("reject")));
"#,
)
.unwrap();
runtime.run_event_loop(false).await.unwrap_err();
assert_eq!(1, PROMISE_REJECT.load(Ordering::Relaxed));
runtime
.execute_script_static(
"promise_reject_callback.js",
r#"
{
const prev = Deno.core.ops.op_set_promise_reject_callback((...args) => {
prev(...args);
});
}
new Promise((_, reject) => reject(Error("reject")));
"#,
)
.unwrap();
runtime.run_event_loop(false).await.unwrap_err();
assert_eq!(2, PROMISE_REJECT.load(Ordering::Relaxed));
}
#[tokio::test]
async fn test_set_promise_reject_callback_realms() {
let mut runtime = JsRuntime::new(RuntimeOptions::default());
let global_realm = runtime.global_realm();
let realm1 = runtime.create_realm().unwrap();
let realm2 = runtime.create_realm().unwrap();
let realm_expectations = &[
(&global_realm, "global_realm", 42),
(&realm1, "realm1", 140),
(&realm2, "realm2", 720),
];
// Set up promise reject callbacks.
for (realm, realm_name, number) in realm_expectations {
realm
.execute_script(
runtime.v8_isolate(),
"",
format!(
r#"
globalThis.rejectValue = undefined;
Deno.core.setPromiseRejectCallback((_type, _promise, reason) => {{
globalThis.rejectValue = `{realm_name}/${{reason}}`;
}});
Deno.core.opAsync("op_void_async").then(() => Promise.reject({number}));
"#
).into()
)
.unwrap();
}
runtime.run_event_loop(false).await.unwrap();
for (realm, realm_name, number) in realm_expectations {
let reject_value = realm
.execute_script_static(
runtime.v8_isolate(),
"",
"globalThis.rejectValue",
)
.unwrap();
let scope = &mut realm.handle_scope(runtime.v8_isolate());
let reject_value = v8::Local::new(scope, reject_value);
assert!(reject_value.is_string());
let reject_value_string = reject_value.to_rust_string_lossy(scope);
assert_eq!(reject_value_string, format!("{realm_name}/{number}"));
}
}
#[tokio::test]
async fn test_set_promise_reject_callback_top_level_await() {
static PROMISE_REJECT: AtomicUsize = AtomicUsize::new(0);
#[op]
fn op_promise_reject() -> Result<(), AnyError> {
PROMISE_REJECT.fetch_add(1, Ordering::Relaxed);
Ok(())
}
deno_core::extension!(test_ext, ops = [op_promise_reject]);
#[derive(Default)]
struct ModsLoader;
impl ModuleLoader for ModsLoader {
fn resolve(
&self,
specifier: &str,
referrer: &str,
_kind: ResolutionKind,
) -> Result<ModuleSpecifier, Error> {
assert_eq!(specifier, "file:///main.js");
assert_eq!(referrer, ".");
let s = crate::resolve_import(specifier, referrer).unwrap();
Ok(s)
}
fn load(
&self,
_module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<&ModuleSpecifier>,
_is_dyn_import: bool,
) -> Pin<Box<ModuleSourceFuture>> {
let code = r#"
Deno.core.ops.op_set_promise_reject_callback((type, promise, reason) => {
Deno.core.ops.op_promise_reject();
});
throw new Error('top level throw');
"#;
async move { Ok(ModuleSource::for_test(code, "file:///main.js")) }
.boxed_local()
}
}
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
module_loader: Some(Rc::new(ModsLoader)),
..Default::default()
});
let id = runtime
.load_main_module(&crate::resolve_url("file:///main.js").unwrap(), None)
.await
.unwrap();
let receiver = runtime.mod_evaluate(id);
runtime.run_event_loop(false).await.unwrap();
receiver.await.unwrap().unwrap_err();
assert_eq!(1, PROMISE_REJECT.load(Ordering::Relaxed));
}
#[test]
fn test_op_return_serde_v8_error() {
#[op]
fn op_err() -> Result<std::collections::BTreeMap<u64, u64>, anyhow::Error> {
Ok([(1, 2), (3, 4)].into_iter().collect()) // Maps can't have non-string keys in serde_v8
}
deno_core::extension!(test_ext, ops = [op_err]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
assert!(runtime
.execute_script_static(
"test_op_return_serde_v8_error.js",
"Deno.core.ops.op_err()"
)
.is_err());
}
#[test]
fn test_op_high_arity() {
#[op]
fn op_add_4(
x1: i64,
x2: i64,
x3: i64,
x4: i64,
) -> Result<i64, anyhow::Error> {
Ok(x1 + x2 + x3 + x4)
}
deno_core::extension!(test_ext, ops = [op_add_4]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
let r = runtime
.execute_script_static("test.js", "Deno.core.ops.op_add_4(1, 2, 3, 4)")
.unwrap();
let scope = &mut runtime.handle_scope();
assert_eq!(r.open(scope).integer_value(scope), Some(10));
}
#[test]
fn test_op_disabled() {
#[op]
fn op_foo() -> Result<i64, anyhow::Error> {
Ok(42)
}
fn ops() -> Vec<OpDecl> {
vec![op_foo::decl().disable()]
}
deno_core::extension!(test_ext, ops_fn = ops);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
let err = runtime
.execute_script_static("test.js", "Deno.core.ops.op_foo()")
.unwrap_err();
assert!(err
.to_string()
.contains("TypeError: Deno.core.ops.op_foo is not a function"));
}
#[test]
fn test_op_detached_buffer() {
use serde_v8::DetachedBuffer;
#[op]
fn op_sum_take(b: DetachedBuffer) -> Result<u64, anyhow::Error> {
Ok(b.as_ref().iter().clone().map(|x| *x as u64).sum())
}
#[op]
fn op_boomerang(
b: DetachedBuffer,
) -> Result<DetachedBuffer, anyhow::Error> {
Ok(b)
}
deno_core::extension!(test_ext, ops = [op_sum_take, op_boomerang]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"test.js",
r#"
const a1 = new Uint8Array([1,2,3]);
const a1b = a1.subarray(0, 3);
const a2 = new Uint8Array([5,10,15]);
const a2b = a2.subarray(0, 3);
if (!(a1.length > 0 && a1b.length > 0)) {
throw new Error("a1 & a1b should have a length");
}
let sum = Deno.core.ops.op_sum_take(a1b);
if (sum !== 6) {
throw new Error(`Bad sum: ${sum}`);
}
if (a1.length > 0 || a1b.length > 0) {
throw new Error("expecting a1 & a1b to be detached");
}
const a3 = Deno.core.ops.op_boomerang(a2b);
if (a3.byteLength != 3) {
throw new Error(`Expected a3.byteLength === 3, got ${a3.byteLength}`);
}
if (a3[0] !== 5 || a3[1] !== 10) {
throw new Error(`Invalid a3: ${a3[0]}, ${a3[1]}`);
}
if (a2.byteLength > 0 || a2b.byteLength > 0) {
throw new Error("expecting a2 & a2b to be detached, a3 re-attached");
}
const wmem = new WebAssembly.Memory({ initial: 1, maximum: 2 });
const w32 = new Uint32Array(wmem.buffer);
w32[0] = 1; w32[1] = 2; w32[2] = 3;
const assertWasmThrow = (() => {
try {
let sum = Deno.core.ops.op_sum_take(w32.subarray(0, 2));
return false;
} catch(e) {
return e.message.includes('invalid type; expected: detachable');
}
});
if (!assertWasmThrow()) {
throw new Error("expected wasm mem to not be detachable");
}
"#,
)
.unwrap();
}
#[test]
fn test_op_unstable_disabling() {
#[op]
fn op_foo() -> Result<i64, anyhow::Error> {
Ok(42)
}
#[op(unstable)]
fn op_bar() -> Result<i64, anyhow::Error> {
Ok(42)
}
deno_core::extension!(
test_ext,
ops = [op_foo, op_bar],
middleware = |op| if op.is_unstable { op.disable() } else { op }
);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
runtime
.execute_script_static(
"test.js",
r#"
if (Deno.core.ops.op_foo() !== 42) {
throw new Error("Exptected op_foo() === 42");
}
if (typeof Deno.core.ops.op_bar !== "undefined") {
throw new Error("Expected op_bar to be disabled")
}
"#,
)
.unwrap();
}
#[test]
fn js_realm_simple() {
let mut runtime = JsRuntime::new(Default::default());
let main_context = runtime.global_context();
let main_global = {
let scope = &mut runtime.handle_scope();
let local_global = main_context.open(scope).global(scope);
v8::Global::new(scope, local_global)
};
let realm = runtime.create_realm().unwrap();
assert_ne!(realm.context(), &main_context);
assert_ne!(realm.global_object(runtime.v8_isolate()), main_global);
let main_object = runtime.execute_script_static("", "Object").unwrap();
let realm_object = realm
.execute_script_static(runtime.v8_isolate(), "", "Object")
.unwrap();
assert_ne!(main_object, realm_object);
}
#[test]
fn js_realm_init() {
#[op]
fn op_test() -> Result<String, Error> {
Ok(String::from("Test"))
}
deno_core::extension!(test_ext, ops = [op_test]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
let realm = runtime.create_realm().unwrap();
let ret = realm
.execute_script_static(
runtime.v8_isolate(),
"",
"Deno.core.ops.op_test()",
)
.unwrap();
let scope = &mut realm.handle_scope(runtime.v8_isolate());
assert_eq!(ret, serde_v8::to_v8(scope, "Test").unwrap());
}
#[test]
fn js_realm_init_snapshot() {
let snapshot = {
let runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
..Default::default()
});
let snap: &[u8] = &runtime.snapshot();
Vec::from(snap).into_boxed_slice()
};
#[op]
fn op_test() -> Result<String, Error> {
Ok(String::from("Test"))
}
deno_core::extension!(
test_ext,
ops = [op_test],
customizer = |ext: &mut deno_core::ExtensionBuilder| {
ext.force_op_registration();
},
);
let mut runtime = JsRuntime::new(RuntimeOptions {
startup_snapshot: Some(Snapshot::Boxed(snapshot)),
extensions: vec![test_ext::init_ops()],
..Default::default()
});
let realm = runtime.create_realm().unwrap();
let ret = realm
.execute_script_static(
runtime.v8_isolate(),
"",
"Deno.core.ops.op_test()",
)
.unwrap();
let scope = &mut realm.handle_scope(runtime.v8_isolate());
assert_eq!(ret, serde_v8::to_v8(scope, "Test").unwrap());
}
#[test]
fn js_realm_sync_ops() {
// Test that returning a ZeroCopyBuf and throwing an exception from a sync
// op result in objects with prototypes from the right realm. Note that we
// don't test the result of returning structs, because they will be
// serialized to objects with null prototype.
#[op]
fn op_test(fail: bool) -> Result<ZeroCopyBuf, Error> {
if !fail {
Ok(ZeroCopyBuf::empty())
} else {
Err(crate::error::type_error("Test"))
}
}
deno_core::extension!(test_ext, ops = [op_test]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
get_error_class_fn: Some(&|error| {
crate::error::get_custom_error_class(error).unwrap()
}),
..Default::default()
});
let new_realm = runtime.create_realm().unwrap();
// Test in both realms
for realm in [runtime.global_realm(), new_realm].into_iter() {
let ret = realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
const buf = Deno.core.ops.op_test(false);
try {
Deno.core.ops.op_test(true);
} catch(e) {
err = e;
}
buf instanceof Uint8Array && buf.byteLength === 0 &&
err instanceof TypeError && err.message === "Test"
"#,
)
.unwrap();
assert!(ret.open(runtime.v8_isolate()).is_true());
}
}
#[tokio::test]
async fn js_realm_async_ops() {
// Test that returning a ZeroCopyBuf and throwing an exception from a async
// op result in objects with prototypes from the right realm. Note that we
// don't test the result of returning structs, because they will be
// serialized to objects with null prototype.
#[op]
async fn op_test(fail: bool) -> Result<ZeroCopyBuf, Error> {
if !fail {
Ok(ZeroCopyBuf::empty())
} else {
Err(crate::error::type_error("Test"))
}
}
deno_core::extension!(test_ext, ops = [op_test]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
get_error_class_fn: Some(&|error| {
crate::error::get_custom_error_class(error).unwrap()
}),
..Default::default()
});
let global_realm = runtime.global_realm();
let new_realm = runtime.create_realm().unwrap();
let mut rets = vec![];
// Test in both realms
for realm in [global_realm, new_realm].into_iter() {
let ret = realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
(async function () {
const buf = await Deno.core.opAsync("op_test", false);
let err;
try {
await Deno.core.opAsync("op_test", true);
} catch(e) {
err = e;
}
return buf instanceof Uint8Array && buf.byteLength === 0 &&
err instanceof TypeError && err.message === "Test" ;
})();
"#,
)
.unwrap();
rets.push((realm, ret));
}
runtime.run_event_loop(false).await.unwrap();
for ret in rets {
let scope = &mut ret.0.handle_scope(runtime.v8_isolate());
let value = v8::Local::new(scope, ret.1);
let promise = v8::Local::<v8::Promise>::try_from(value).unwrap();
let result = promise.result(scope);
assert!(result.is_boolean() && result.is_true());
}
}
#[tokio::test]
async fn js_realm_ref_unref_ops() {
// Never resolves.
#[op]
async fn op_pending() {
futures::future::pending().await
}
deno_core::extension!(test_ext, ops = [op_pending]);
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![test_ext::init_ops()],
..Default::default()
});
poll_fn(move |cx| {
let main_realm = runtime.global_realm();
let other_realm = runtime.create_realm().unwrap();
main_realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
var promise = Deno.core.opAsync("op_pending");
"#,
)
.unwrap();
other_realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
var promise = Deno.core.opAsync("op_pending");
"#,
)
.unwrap();
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
main_realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
let promiseIdSymbol = Symbol.for("Deno.core.internalPromiseId");
Deno.core.unrefOp(promise[promiseIdSymbol]);
"#,
)
.unwrap();
assert!(matches!(runtime.poll_event_loop(cx, false), Poll::Pending));
other_realm
.execute_script_static(
runtime.v8_isolate(),
"",
r#"
let promiseIdSymbol = Symbol.for("Deno.core.internalPromiseId");
Deno.core.unrefOp(promise[promiseIdSymbol]);
"#,
)
.unwrap();
assert!(matches!(
runtime.poll_event_loop(cx, false),
Poll::Ready(Ok(()))
));
Poll::Ready(())
})
.await;
}
#[test]
fn test_array_by_copy() {
// Verify that "array by copy" proposal is enabled (https://github.com/tc39/proposal-change-array-by-copy)
let mut runtime = JsRuntime::new(Default::default());
assert!(runtime
.execute_script_static(
"test_array_by_copy.js",
"const a = [1, 2, 3];
const b = a.toReversed();
if (!(a[0] === 1 && a[1] === 2 && a[2] === 3)) {
throw new Error('Expected a to be intact');
}
if (!(b[0] === 3 && b[1] === 2 && b[2] === 1)) {
throw new Error('Expected b to be reversed');
}",
)
.is_ok());
}
#[tokio::test]
async fn cant_load_internal_module_when_snapshot_is_loaded_and_not_snapshotting(
) {
#[derive(Default)]
struct ModsLoader;
impl ModuleLoader for ModsLoader {
fn resolve(
&self,
specifier: &str,
referrer: &str,
_kind: ResolutionKind,
) -> Result<ModuleSpecifier, Error> {
assert_eq!(specifier, "file:///main.js");
assert_eq!(referrer, ".");
let s = crate::resolve_import(specifier, referrer).unwrap();
Ok(s)
}
fn load(
&self,
_module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<&ModuleSpecifier>,
_is_dyn_import: bool,
) -> Pin<Box<ModuleSourceFuture>> {
let code = r#"
// This module doesn't really exist, just verifying that we'll get
// an error when specifier starts with "ext:".
import { core } from "ext:core.js";
"#;
async move { Ok(ModuleSource::for_test(code, "file:///main.js")) }
.boxed_local()
}
}
let snapshot = {
let runtime = JsRuntime::new(RuntimeOptions {
will_snapshot: true,
..Default::default()
});
let snap: &[u8] = &runtime.snapshot();
Vec::from(snap).into_boxed_slice()
};
let mut runtime2 = JsRuntime::new(RuntimeOptions {
module_loader: Some(Rc::new(ModsLoader)),
startup_snapshot: Some(Snapshot::Boxed(snapshot)),
..Default::default()
});
let err = runtime2
.load_main_module(&crate::resolve_url("file:///main.js").unwrap(), None)
.await
.unwrap_err();
assert_eq!(
err.to_string(),
"Cannot load extension module from external code"
);
}
}
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