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#[macro_use]
extern crate lazy_static;
mod builtins;
mod isolate_state;
mod js_loading;
mod module;
mod script;
pub(crate) use isolate_state::IsolateState;
use rusty_v8 as v8;
pub fn init(v8_flags: Option<Vec<String>>) {
if let Some(mut v8_flags) = v8_flags {
v8_flags.push("jstime".to_owned());
v8_flags.rotate_right(1);
v8::V8::set_flags_from_command_line(v8_flags);
}
let platform = v8::new_default_platform().unwrap();
v8::V8::initialize_platform(platform);
v8::V8::initialize();
}
pub struct Options {
pub snapshot: Option<&'static [u8]>,
taking_snapshot: bool,
}
impl Options {
pub fn new(snapshot: Option<&'static [u8]>) -> Options {
Options {
snapshot,
..Options::default()
}
}
}
impl Default for Options {
fn default() -> Options {
Options {
snapshot: None,
taking_snapshot: false,
}
}
}
pub struct JSTime {
isolate: Option<v8::OwnedIsolate>,
taking_snapshot: bool,
}
impl JSTime {
pub fn new(options: Options) -> JSTime {
let mut create_params =
v8::Isolate::create_params().external_references(&**builtins::EXTERNAL_REFERENCES);
if let Some(snapshot) = options.snapshot {
create_params = create_params.snapshot_blob(snapshot);
}
let isolate = v8::Isolate::new(create_params);
JSTime::create(options, isolate)
}
pub fn create_snapshot(mut options: Options) -> Vec<u8> {
assert!(
options.snapshot.is_none(),
"Cannot pass snapshot data while creating snapshot"
);
options.taking_snapshot = true;
let mut s = v8::SnapshotCreator::new(Some(&builtins::EXTERNAL_REFERENCES));
{
let mut jstime = JSTime::create(options, unsafe { s.get_owned_isolate() });
{
let context = IsolateState::get(&mut jstime.isolate()).borrow().context();
let scope = &mut v8::HandleScope::new(jstime.isolate());
let context = v8::Local::new(scope, context);
s.set_default_context(context);
}
IsolateState::get(&mut jstime.isolate())
.borrow_mut()
.drop_context();
}
match s.create_blob(v8::FunctionCodeHandling::Keep) {
Some(data) => data.to_owned(),
None => {
std::mem::forget(s);
panic!("Unable to create snapshot");
}
}
}
fn create(options: Options, mut isolate: v8::OwnedIsolate) -> JSTime {
let global_context = {
let scope = &mut v8::HandleScope::new(&mut isolate);
let context = v8::Context::new(scope);
v8::Global::new(scope, context)
};
isolate.set_slot(IsolateState::new(global_context));
if options.snapshot.is_none() {
let context = IsolateState::get(&mut isolate).borrow().context();
let scope = &mut v8::HandleScope::with_context(&mut isolate, context);
builtins::Builtins::create(scope);
}
JSTime {
isolate: Some(isolate),
taking_snapshot: options.taking_snapshot,
}
}
fn isolate(&mut self) -> &mut v8::Isolate {
match self.isolate.as_mut() {
Some(i) => i,
None => unsafe {
std::hint::unreachable_unchecked();
},
}
}
pub fn import(&mut self, filename: &str) -> Result<(), String> {
let context = IsolateState::get(&mut self.isolate()).borrow().context();
let scope = &mut v8::HandleScope::with_context(self.isolate(), context);
let loader = module::Loader::new();
let mut cwd = std::env::current_dir().unwrap();
cwd.push("jstime");
let cwd = cwd.into_os_string().into_string().unwrap();
match loader.import(scope, &cwd, filename) {
Ok(_) => Ok(()),
Err(e) => Err(e.to_string(scope).unwrap().to_rust_string_lossy(scope)),
}
}
pub fn run_script(&mut self, source: &str, filename: &str) -> Result<String, String> {
let context = IsolateState::get(self.isolate()).borrow().context();
let scope = &mut v8::HandleScope::with_context(self.isolate(), context);
match script::run(scope, source, filename) {
Ok(v) => Ok(v.to_string(scope).unwrap().to_rust_string_lossy(scope)),
Err(e) => Err(e.to_string(scope).unwrap().to_rust_string_lossy(scope)),
}
}
}
impl Drop for JSTime {
fn drop(&mut self) {
if self.taking_snapshot {
std::mem::forget(self.isolate.take().unwrap())
}
}
}