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ops_builtin_v8.rs
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ops_builtin_v8.rs
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use crate::bindings::script_origin;
use crate::error::custom_error;
use crate::error::is_instance_of_error;
use crate::error::range_error;
use crate::error::type_error;
use crate::error::JsError;
use crate::ops_builtin::WasmStreamingResource;
use crate::resolve_url;
use crate::serde_v8::from_v8;
use crate::source_map::apply_source_map as apply_source_map_;
use crate::JsRealm;
use crate::JsRuntime;
use crate::ZeroCopyBuf;
use anyhow::Error;
use deno_ops::op;
use serde::Deserialize;
use serde::Serialize;
use std::cell::RefCell;
use v8::ValueDeserializerHelper;
use v8::ValueSerializerHelper;
fn to_v8_fn(
scope: &mut v8::HandleScope,
value: serde_v8::Value,
) -> Result<v8::Global<v8::Function>, Error> {
v8::Local::<v8::Function>::try_from(value.v8_value)
.map(|cb| v8::Global::new(scope, cb))
.map_err(|err| type_error(err.to_string()))
}
#[inline]
fn to_v8_local_fn(
value: serde_v8::Value,
) -> Result<v8::Local<v8::Function>, Error> {
v8::Local::<v8::Function>::try_from(value.v8_value)
.map_err(|err| type_error(err.to_string()))
}
#[op(v8)]
fn op_ref_op(scope: &mut v8::HandleScope, promise_id: i32) {
let context_state = JsRealm::state_from_scope(scope);
context_state.borrow_mut().unrefed_ops.remove(&promise_id);
}
#[op(v8)]
fn op_unref_op(scope: &mut v8::HandleScope, promise_id: i32) {
let context_state = JsRealm::state_from_scope(scope);
context_state.borrow_mut().unrefed_ops.insert(promise_id);
}
#[op(v8)]
fn op_set_macrotask_callback(
scope: &mut v8::HandleScope,
cb: serde_v8::Value,
) -> Result<(), Error> {
let cb = to_v8_fn(scope, cb)?;
let state_rc = JsRuntime::state(scope);
state_rc.borrow_mut().js_macrotask_cbs.push(cb);
Ok(())
}
#[op(v8)]
fn op_set_next_tick_callback(
scope: &mut v8::HandleScope,
cb: serde_v8::Value,
) -> Result<(), Error> {
let cb = to_v8_fn(scope, cb)?;
let state_rc = JsRuntime::state(scope);
state_rc.borrow_mut().js_nexttick_cbs.push(cb);
Ok(())
}
#[op(v8)]
fn op_set_promise_reject_callback<'a>(
scope: &mut v8::HandleScope<'a>,
cb: serde_v8::Value,
) -> Result<Option<serde_v8::Value<'a>>, Error> {
let cb = to_v8_fn(scope, cb)?;
let context_state_rc = JsRealm::state_from_scope(scope);
let old = context_state_rc
.borrow_mut()
.js_promise_reject_cb
.replace(cb);
let old = old.map(|v| v8::Local::new(scope, v));
Ok(old.map(|v| from_v8(scope, v.into()).unwrap()))
}
#[op(v8)]
fn op_run_microtasks(scope: &mut v8::HandleScope) {
scope.perform_microtask_checkpoint();
}
#[op(v8)]
fn op_has_tick_scheduled(scope: &mut v8::HandleScope) -> bool {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow();
state.has_tick_scheduled
}
#[op(v8)]
fn op_set_has_tick_scheduled(scope: &mut v8::HandleScope, v: bool) {
let state_rc = JsRuntime::state(scope);
state_rc.borrow_mut().has_tick_scheduled = v;
}
#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
struct EvalContextError<'s> {
thrown: serde_v8::Value<'s>,
is_native_error: bool,
is_compile_error: bool,
}
#[derive(Serialize)]
struct EvalContextResult<'s>(
Option<serde_v8::Value<'s>>,
Option<EvalContextError<'s>>,
);
#[op(v8)]
fn op_eval_context<'a>(
scope: &mut v8::HandleScope<'a>,
source: serde_v8::Value<'a>,
specifier: String,
) -> Result<EvalContextResult<'a>, Error> {
let tc_scope = &mut v8::TryCatch::new(scope);
let source = v8::Local::<v8::String>::try_from(source.v8_value)
.map_err(|_| type_error("Invalid source"))?;
let specifier = resolve_url(&specifier)?.to_string();
let specifier = v8::String::new(tc_scope, &specifier).unwrap();
let origin = script_origin(tc_scope, specifier);
let script = match v8::Script::compile(tc_scope, source, Some(&origin)) {
Some(s) => s,
None => {
assert!(tc_scope.has_caught());
let exception = tc_scope.exception().unwrap();
return Ok(EvalContextResult(
None,
Some(EvalContextError {
thrown: exception.into(),
is_native_error: is_instance_of_error(tc_scope, exception),
is_compile_error: true,
}),
));
}
};
match script.run(tc_scope) {
Some(result) => Ok(EvalContextResult(Some(result.into()), None)),
None => {
assert!(tc_scope.has_caught());
let exception = tc_scope.exception().unwrap();
Ok(EvalContextResult(
None,
Some(EvalContextError {
thrown: exception.into(),
is_native_error: is_instance_of_error(tc_scope, exception),
is_compile_error: false,
}),
))
}
}
}
#[op(v8)]
fn op_queue_microtask(
scope: &mut v8::HandleScope,
cb: serde_v8::Value,
) -> Result<(), Error> {
scope.enqueue_microtask(to_v8_local_fn(cb)?);
Ok(())
}
#[op(v8)]
fn op_create_host_object<'a>(
scope: &mut v8::HandleScope<'a>,
) -> serde_v8::Value<'a> {
let template = v8::ObjectTemplate::new(scope);
template.set_internal_field_count(1);
let object = template.new_instance(scope).unwrap();
from_v8(scope, object.into()).unwrap()
}
#[op(v8)]
fn op_encode<'a>(
scope: &mut v8::HandleScope<'a>,
text: serde_v8::Value<'a>,
) -> Result<serde_v8::Value<'a>, Error> {
let text = v8::Local::<v8::String>::try_from(text.v8_value)
.map_err(|_| type_error("Invalid argument"))?;
let text_str = serde_v8::to_utf8(text, scope);
let bytes = text_str.into_bytes();
let len = bytes.len();
let backing_store =
v8::ArrayBuffer::new_backing_store_from_vec(bytes).make_shared();
let buffer = v8::ArrayBuffer::with_backing_store(scope, &backing_store);
let u8array = v8::Uint8Array::new(scope, buffer, 0, len).unwrap();
Ok((from_v8(scope, u8array.into()))?)
}
#[op(v8)]
fn op_decode<'a>(
scope: &mut v8::HandleScope<'a>,
zero_copy: &[u8],
) -> Result<serde_v8::Value<'a>, Error> {
let buf = &zero_copy;
// Strip BOM
let buf =
if buf.len() >= 3 && buf[0] == 0xef && buf[1] == 0xbb && buf[2] == 0xbf {
&buf[3..]
} else {
buf
};
// If `String::new_from_utf8()` returns `None`, this means that the
// length of the decoded string would be longer than what V8 can
// handle. In this case we return `RangeError`.
//
// For more details see:
// - https://encoding.spec.whatwg.org/#dom-textdecoder-decode
// - https://github.com/denoland/deno/issues/6649
// - https://github.com/v8/v8/blob/d68fb4733e39525f9ff0a9222107c02c28096e2a/include/v8.h#L3277-L3278
match v8::String::new_from_utf8(scope, buf, v8::NewStringType::Normal) {
Some(text) => Ok(from_v8(scope, text.into())?),
None => Err(range_error("string too long")),
}
}
struct SerializeDeserialize<'a> {
host_objects: Option<v8::Local<'a, v8::Array>>,
error_callback: Option<v8::Local<'a, v8::Function>>,
}
impl<'a> v8::ValueSerializerImpl for SerializeDeserialize<'a> {
#[allow(unused_variables)]
fn throw_data_clone_error<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
message: v8::Local<'s, v8::String>,
) {
if let Some(cb) = self.error_callback {
let scope = &mut v8::TryCatch::new(scope);
let undefined = v8::undefined(scope).into();
cb.call(scope, undefined, &[message.into()]);
if scope.has_caught() || scope.has_terminated() {
scope.rethrow();
return;
};
}
let error = v8::Exception::type_error(scope, message);
scope.throw_exception(error);
}
fn get_shared_array_buffer_id<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
shared_array_buffer: v8::Local<'s, v8::SharedArrayBuffer>,
) -> Option<u32> {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
if let Some(shared_array_buffer_store) = &state.shared_array_buffer_store {
let backing_store = shared_array_buffer.get_backing_store();
let id = shared_array_buffer_store.insert(backing_store);
Some(id)
} else {
None
}
}
fn get_wasm_module_transfer_id(
&mut self,
scope: &mut v8::HandleScope<'_>,
module: v8::Local<v8::WasmModuleObject>,
) -> Option<u32> {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
if let Some(compiled_wasm_module_store) = &state.compiled_wasm_module_store
{
let compiled_wasm_module = module.get_compiled_module();
let id = compiled_wasm_module_store.insert(compiled_wasm_module);
Some(id)
} else {
None
}
}
fn write_host_object<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
object: v8::Local<'s, v8::Object>,
value_serializer: &mut dyn v8::ValueSerializerHelper,
) -> Option<bool> {
if let Some(host_objects) = self.host_objects {
for i in 0..host_objects.length() {
let value = host_objects.get_index(scope, i).unwrap();
if value == object {
value_serializer.write_uint32(i);
return Some(true);
}
}
}
let message = v8::String::new(scope, "Unsupported object type").unwrap();
self.throw_data_clone_error(scope, message);
None
}
}
impl<'a> v8::ValueDeserializerImpl for SerializeDeserialize<'a> {
fn get_shared_array_buffer_from_id<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
transfer_id: u32,
) -> Option<v8::Local<'s, v8::SharedArrayBuffer>> {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
if let Some(shared_array_buffer_store) = &state.shared_array_buffer_store {
let backing_store = shared_array_buffer_store.take(transfer_id)?;
let shared_array_buffer =
v8::SharedArrayBuffer::with_backing_store(scope, &backing_store);
Some(shared_array_buffer)
} else {
None
}
}
fn get_wasm_module_from_id<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
clone_id: u32,
) -> Option<v8::Local<'s, v8::WasmModuleObject>> {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
if let Some(compiled_wasm_module_store) = &state.compiled_wasm_module_store
{
let compiled_module = compiled_wasm_module_store.take(clone_id)?;
v8::WasmModuleObject::from_compiled_module(scope, &compiled_module)
} else {
None
}
}
fn read_host_object<'s>(
&mut self,
scope: &mut v8::HandleScope<'s>,
value_deserializer: &mut dyn v8::ValueDeserializerHelper,
) -> Option<v8::Local<'s, v8::Object>> {
if let Some(host_objects) = self.host_objects {
let mut i = 0;
if !value_deserializer.read_uint32(&mut i) {
return None;
}
let maybe_value = host_objects.get_index(scope, i);
if let Some(value) = maybe_value {
return value.to_object(scope);
}
}
let message =
v8::String::new(scope, "Failed to deserialize host object").unwrap();
let error = v8::Exception::error(scope, message);
scope.throw_exception(error);
None
}
}
#[derive(Default, Deserialize)]
#[serde(rename_all = "camelCase")]
struct SerializeDeserializeOptions<'a> {
host_objects: Option<serde_v8::Value<'a>>,
transferred_array_buffers: Option<serde_v8::Value<'a>>,
}
#[op(v8)]
fn op_serialize(
scope: &mut v8::HandleScope,
value: serde_v8::Value,
options: Option<SerializeDeserializeOptions>,
error_callback: Option<serde_v8::Value>,
) -> Result<ZeroCopyBuf, Error> {
let options = options.unwrap_or_default();
let error_callback = match error_callback {
Some(cb) => Some(
v8::Local::<v8::Function>::try_from(cb.v8_value)
.map_err(|_| type_error("Invalid error callback"))?,
),
None => None,
};
let host_objects = match options.host_objects {
Some(value) => Some(
v8::Local::<v8::Array>::try_from(value.v8_value)
.map_err(|_| type_error("hostObjects not an array"))?,
),
None => None,
};
let transferred_array_buffers = match options.transferred_array_buffers {
Some(value) => Some(
v8::Local::<v8::Array>::try_from(value.v8_value)
.map_err(|_| type_error("transferredArrayBuffers not an array"))?,
),
None => None,
};
let serialize_deserialize = Box::new(SerializeDeserialize {
host_objects,
error_callback,
});
let mut value_serializer =
v8::ValueSerializer::new(scope, serialize_deserialize);
value_serializer.write_header();
if let Some(transferred_array_buffers) = transferred_array_buffers {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
for index in 0..transferred_array_buffers.length() {
let i = v8::Number::new(scope, index as f64).into();
let buf = transferred_array_buffers.get(scope, i).unwrap();
let buf = v8::Local::<v8::ArrayBuffer>::try_from(buf).map_err(|_| {
type_error("item in transferredArrayBuffers not an ArrayBuffer")
})?;
if let Some(shared_array_buffer_store) = &state.shared_array_buffer_store
{
if !buf.is_detachable() {
return Err(type_error(
"item in transferredArrayBuffers is not transferable",
));
}
if buf.was_detached() {
return Err(custom_error(
"DOMExceptionOperationError",
format!("ArrayBuffer at index {index} is already detached"),
));
}
let backing_store = buf.get_backing_store();
buf.detach(None);
let id = shared_array_buffer_store.insert(backing_store);
value_serializer.transfer_array_buffer(id, buf);
let id = v8::Number::new(scope, id as f64).into();
transferred_array_buffers.set(scope, i, id);
}
}
}
let scope = &mut v8::TryCatch::new(scope);
let ret =
value_serializer.write_value(scope.get_current_context(), value.v8_value);
if scope.has_caught() || scope.has_terminated() {
scope.rethrow();
// Dummy value, this result will be discarded because an error was thrown.
Ok(ZeroCopyBuf::empty())
} else if let Some(true) = ret {
let vector = value_serializer.release();
Ok(vector.into())
} else {
Err(type_error("Failed to serialize response"))
}
}
#[op(v8)]
fn op_deserialize<'a>(
scope: &mut v8::HandleScope<'a>,
zero_copy: ZeroCopyBuf,
options: Option<SerializeDeserializeOptions>,
) -> Result<serde_v8::Value<'a>, Error> {
let options = options.unwrap_or_default();
let host_objects = match options.host_objects {
Some(value) => Some(
v8::Local::<v8::Array>::try_from(value.v8_value)
.map_err(|_| type_error("hostObjects not an array"))?,
),
None => None,
};
let transferred_array_buffers = match options.transferred_array_buffers {
Some(value) => Some(
v8::Local::<v8::Array>::try_from(value.v8_value)
.map_err(|_| type_error("transferredArrayBuffers not an array"))?,
),
None => None,
};
let serialize_deserialize = Box::new(SerializeDeserialize {
host_objects,
error_callback: None,
});
let mut value_deserializer =
v8::ValueDeserializer::new(scope, serialize_deserialize, &zero_copy);
let parsed_header = value_deserializer
.read_header(scope.get_current_context())
.unwrap_or_default();
if !parsed_header {
return Err(range_error("could not deserialize value"));
}
if let Some(transferred_array_buffers) = transferred_array_buffers {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow_mut();
if let Some(shared_array_buffer_store) = &state.shared_array_buffer_store {
for i in 0..transferred_array_buffers.length() {
let i = v8::Number::new(scope, i as f64).into();
let id_val = transferred_array_buffers.get(scope, i).unwrap();
let id = match id_val.number_value(scope) {
Some(id) => id as u32,
None => {
return Err(type_error(
"item in transferredArrayBuffers not number",
))
}
};
if let Some(backing_store) = shared_array_buffer_store.take(id) {
let array_buffer =
v8::ArrayBuffer::with_backing_store(scope, &backing_store);
value_deserializer.transfer_array_buffer(id, array_buffer);
transferred_array_buffers.set(scope, id_val, array_buffer.into());
} else {
return Err(type_error(
"transferred array buffer not present in shared_array_buffer_store",
));
}
}
}
}
let value = value_deserializer.read_value(scope.get_current_context());
match value {
Some(deserialized) => Ok(deserialized.into()),
None => Err(range_error("could not deserialize value")),
}
}
#[derive(Serialize)]
struct PromiseDetails<'s>(u32, Option<serde_v8::Value<'s>>);
#[op(v8)]
fn op_get_promise_details<'a>(
scope: &mut v8::HandleScope<'a>,
promise: serde_v8::Value<'a>,
) -> Result<PromiseDetails<'a>, Error> {
let promise = v8::Local::<v8::Promise>::try_from(promise.v8_value)
.map_err(|_| type_error("Invalid argument"))?;
match promise.state() {
v8::PromiseState::Pending => Ok(PromiseDetails(0, None)),
v8::PromiseState::Fulfilled => {
Ok(PromiseDetails(1, Some(promise.result(scope).into())))
}
v8::PromiseState::Rejected => {
Ok(PromiseDetails(2, Some(promise.result(scope).into())))
}
}
}
#[op(v8)]
fn op_set_promise_hooks(
scope: &mut v8::HandleScope,
init_hook: serde_v8::Value,
before_hook: serde_v8::Value,
after_hook: serde_v8::Value,
resolve_hook: serde_v8::Value,
) -> Result<(), Error> {
let v8_fns = [init_hook, before_hook, after_hook, resolve_hook]
.into_iter()
.enumerate()
.filter(|(_, hook)| !hook.v8_value.is_undefined())
.try_fold([None; 4], |mut v8_fns, (i, hook)| {
let v8_fn = v8::Local::<v8::Function>::try_from(hook.v8_value)
.map_err(|err| type_error(err.to_string()))?;
v8_fns[i] = Some(v8_fn);
Ok::<_, Error>(v8_fns)
})?;
scope.set_promise_hooks(
v8_fns[0], // init
v8_fns[1], // before
v8_fns[2], // after
v8_fns[3], // resolve
);
Ok(())
}
// Based on https://github.com/nodejs/node/blob/1e470510ff74391d7d4ec382909ea8960d2d2fbc/src/node_util.cc
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#[op(v8)]
fn op_get_proxy_details<'a>(
scope: &mut v8::HandleScope<'a>,
proxy: serde_v8::Value<'a>,
) -> Option<(serde_v8::Value<'a>, serde_v8::Value<'a>)> {
let proxy = match v8::Local::<v8::Proxy>::try_from(proxy.v8_value) {
Ok(proxy) => proxy,
Err(_) => return None,
};
let target = proxy.get_target(scope);
let handler = proxy.get_handler(scope);
Some((target.into(), handler.into()))
}
// HeapStats stores values from a isolate.get_heap_statistics() call
#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
struct MemoryUsage {
physical_total: usize,
heap_total: usize,
heap_used: usize,
external: usize,
// TODO: track ArrayBuffers, would require using a custom allocator to track
// but it's otherwise a subset of external so can be indirectly tracked
// array_buffers: usize,
}
#[op(v8)]
fn op_memory_usage(scope: &mut v8::HandleScope) -> MemoryUsage {
let mut s = v8::HeapStatistics::default();
scope.get_heap_statistics(&mut s);
MemoryUsage {
physical_total: s.total_physical_size(),
heap_total: s.total_heap_size(),
heap_used: s.used_heap_size(),
external: s.external_memory(),
}
}
#[op(v8)]
fn op_set_wasm_streaming_callback(
scope: &mut v8::HandleScope,
cb: serde_v8::Value,
) -> Result<(), Error> {
let cb = to_v8_fn(scope, cb)?;
let context_state_rc = JsRealm::state_from_scope(scope);
let mut context_state = context_state_rc.borrow_mut();
// The callback to pass to the v8 API has to be a unit type, so it can't
// borrow or move any local variables. Therefore, we're storing the JS
// callback in a JsRuntimeState slot.
if context_state.js_wasm_streaming_cb.is_some() {
return Err(type_error("op_set_wasm_streaming_callback already called"));
}
context_state.js_wasm_streaming_cb = Some(cb);
scope.set_wasm_streaming_callback(|scope, arg, wasm_streaming| {
let (cb_handle, streaming_rid) = {
let context_state_rc = JsRealm::state_from_scope(scope);
let cb_handle = context_state_rc
.borrow()
.js_wasm_streaming_cb
.as_ref()
.unwrap()
.clone();
let state_rc = JsRuntime::state(scope);
let streaming_rid = state_rc
.borrow()
.op_state
.borrow_mut()
.resource_table
.add(WasmStreamingResource(RefCell::new(wasm_streaming)));
(cb_handle, streaming_rid)
};
let undefined = v8::undefined(scope);
let rid = serde_v8::to_v8(scope, streaming_rid).unwrap();
cb_handle
.open(scope)
.call(scope, undefined.into(), &[arg, rid]);
});
Ok(())
}
#[allow(clippy::let_and_return)]
#[op(v8)]
fn op_abort_wasm_streaming(
scope: &mut v8::HandleScope,
rid: u32,
error: serde_v8::Value,
) -> Result<(), Error> {
let wasm_streaming = {
let state_rc = JsRuntime::state(scope);
let state = state_rc.borrow();
let wsr = state
.op_state
.borrow_mut()
.resource_table
.take::<WasmStreamingResource>(rid)?;
wsr
};
// At this point there are no clones of Rc<WasmStreamingResource> on the
// resource table, and no one should own a reference because we're never
// cloning them. So we can be sure `wasm_streaming` is the only reference.
if let Ok(wsr) = std::rc::Rc::try_unwrap(wasm_streaming) {
// NOTE: v8::WasmStreaming::abort can't be called while `state` is borrowed;
// see https://github.com/denoland/deno/issues/13917
wsr.0.into_inner().abort(Some(error.v8_value));
} else {
panic!("Couldn't consume WasmStreamingResource.");
}
Ok(())
}
#[op(v8)]
fn op_destructure_error(
scope: &mut v8::HandleScope,
error: serde_v8::Value,
) -> JsError {
JsError::from_v8_exception(scope, error.v8_value)
}
/// Effectively throw an uncatchable error. This will terminate runtime
/// execution before any more JS code can run, except in the REPL where it
/// should just output the error to the console.
#[op(v8)]
fn op_dispatch_exception(
scope: &mut v8::HandleScope,
exception: serde_v8::Value,
) {
let state_rc = JsRuntime::state(scope);
let mut state = state_rc.borrow_mut();
state
.dispatched_exceptions
.push_front(v8::Global::new(scope, exception.v8_value));
// Only terminate execution if there are no inspector sessions.
if state.inspector.is_none() {
scope.terminate_execution();
return;
}
// FIXME(bartlomieju): I'm not sure if this assumption is valid... Maybe when
// inspector is polling on pause?
if state.inspector().try_borrow().is_ok() {
scope.terminate_execution();
} else {
// If the inspector is borrowed at this time, assume an inspector is active.
}
}
#[op(v8)]
fn op_op_names(scope: &mut v8::HandleScope) -> Vec<String> {
let state_rc = JsRealm::state_from_scope(scope);
let state = state_rc.borrow();
state
.op_ctxs
.iter()
.map(|o| o.decl.name.to_string())
.collect()
}
#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
struct Location {
file_name: String,
line_number: u32,
column_number: u32,
}
#[op(v8)]
fn op_apply_source_map(
scope: &mut v8::HandleScope,
location: Location,
) -> Result<Location, Error> {
let state_rc = JsRuntime::state(scope);
let state = &mut *state_rc.borrow_mut();
if let Some(source_map_getter) = &state.source_map_getter {
let mut location = location;
let (f, l, c) = apply_source_map_(
location.file_name,
location.line_number.into(),
location.column_number.into(),
&mut state.source_map_cache,
source_map_getter.as_ref(),
);
location.file_name = f;
location.line_number = l as u32;
location.column_number = c as u32;
Ok(location)
} else {
Ok(location)
}
}
/// Set a callback which formats exception messages as stored in
/// `JsError::exception_message`. The callback is passed the error value and
/// should return a string or `null`. If no callback is set or the callback
/// returns `null`, the built-in default formatting will be used.
#[op(v8)]
fn op_set_format_exception_callback<'a>(
scope: &mut v8::HandleScope<'a>,
cb: serde_v8::Value<'a>,
) -> Result<Option<serde_v8::Value<'a>>, Error> {
let cb = to_v8_fn(scope, cb)?;
let context_state_rc = JsRealm::state_from_scope(scope);
let old = context_state_rc
.borrow_mut()
.js_format_exception_cb
.replace(cb);
let old = old.map(|v| v8::Local::new(scope, v));
Ok(old.map(|v| from_v8(scope, v.into()).unwrap()))
}
#[op(v8)]
fn op_event_loop_has_more_work(scope: &mut v8::HandleScope) -> bool {
JsRuntime::event_loop_pending_state_from_isolate(scope).is_pending()
}
#[op(v8)]
fn op_store_pending_promise_rejection<'a>(
scope: &mut v8::HandleScope<'a>,
promise: serde_v8::Value<'a>,
reason: serde_v8::Value<'a>,
) {
let context_state_rc = JsRealm::state_from_scope(scope);
let mut context_state = context_state_rc.borrow_mut();
let promise_value =
v8::Local::<v8::Promise>::try_from(promise.v8_value).unwrap();
let promise_global = v8::Global::new(scope, promise_value);
let error_global = v8::Global::new(scope, reason.v8_value);
context_state
.pending_promise_rejections
.insert(promise_global, error_global);
}
#[op(v8)]
fn op_remove_pending_promise_rejection<'a>(
scope: &mut v8::HandleScope<'a>,
promise: serde_v8::Value<'a>,
) {
let context_state_rc = JsRealm::state_from_scope(scope);
let mut context_state = context_state_rc.borrow_mut();
let promise_value =
v8::Local::<v8::Promise>::try_from(promise.v8_value).unwrap();
let promise_global = v8::Global::new(scope, promise_value);
context_state
.pending_promise_rejections
.remove(&promise_global);
}
#[op(v8)]
fn op_has_pending_promise_rejection<'a>(
scope: &mut v8::HandleScope<'a>,
promise: serde_v8::Value<'a>,
) -> bool {
let context_state_rc = JsRealm::state_from_scope(scope);
let context_state = context_state_rc.borrow();
let promise_value =
v8::Local::<v8::Promise>::try_from(promise.v8_value).unwrap();
let promise_global = v8::Global::new(scope, promise_value);
context_state
.pending_promise_rejections
.contains_key(&promise_global)
}
#[op(v8)]
fn op_arraybuffer_was_detached<'a>(
_scope: &mut v8::HandleScope<'a>,
input: serde_v8::Value<'a>,
) -> Result<bool, Error> {
let ab = v8::Local::<v8::ArrayBuffer>::try_from(input.v8_value)?;
Ok(ab.was_detached())
}