mirror of
https://github.com/servo/servo
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b1245dce4c
Testing: Just refactor, but should be covered by WPT. Part of #40600 Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
109 lines
3.3 KiB
Rust
109 lines
3.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::cell::Cell;
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use std::marker::PhantomData;
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use std::ops::Deref;
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use js::context::JSContext as SafeJSContext;
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use js::jsapi::JSContext as RawJSContext;
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use js::realm::{AutoRealm, CurrentRealm};
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#[derive(Clone, Copy)]
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#[repr(transparent)]
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pub struct JSContext(*mut RawJSContext);
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impl From<&mut SafeJSContext> for JSContext {
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fn from(safe_cx: &mut SafeJSContext) -> Self {
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unsafe { JSContext(safe_cx.raw_cx()) }
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}
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}
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impl<'a> From<&mut CurrentRealm<'a>> for JSContext {
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fn from(safe_cx: &mut CurrentRealm<'a>) -> Self {
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unsafe { JSContext(safe_cx.raw_cx()) }
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}
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}
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impl<'a> From<&mut AutoRealm<'a>> for JSContext {
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fn from(safe_cx: &mut AutoRealm<'a>) -> Self {
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unsafe { JSContext(safe_cx.raw_cx()) }
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}
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}
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#[expect(unsafe_code)]
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impl JSContext {
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/// Create a new [`JSContext`] object from the given raw pointer.
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///
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/// # Safety
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///
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/// The `RawJSContext` argument must point to a valid `RawJSContext` in memory.
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pub unsafe fn from_ptr(raw_js_context: *mut RawJSContext) -> Self {
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JSContext(raw_js_context)
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}
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/// For compatibility with [js::context::JSContext]
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pub fn raw_cx(&self) -> *mut RawJSContext {
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self.0
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}
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/// For compatibility with [js::context::JSContext]
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pub fn raw_cx_no_gc(&self) -> *mut RawJSContext {
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self.0
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}
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}
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impl Deref for JSContext {
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type Target = *mut RawJSContext;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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thread_local!(
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static THREAD_ACTIVE: Cell<bool> = const { Cell::new(true) };
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);
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pub fn runtime_is_alive() -> bool {
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THREAD_ACTIVE.with(|t| t.get())
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}
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pub fn mark_runtime_dead() {
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THREAD_ACTIVE.with(|t| t.set(false));
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}
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/// Get the current JSContext for the running thread.
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///
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/// ## Safety
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/// Using this function is unsafe because no other JSContext may be constructed apart from initial ones,
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/// but because we are still working on passing down &mut SafeJSContext references,
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/// this function is provided as temporary workaround/placeholder.
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///
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/// As such all it's usages will need to be eventually replaced with proper &mut SafeJSContext references.
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pub unsafe fn temp_cx() -> SafeJSContext {
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unsafe { SafeJSContext::from_ptr(js::rust::Runtime::get().unwrap()) }
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}
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#[derive(Clone, Copy, Debug)]
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/// A compile-time marker that there are operations that could trigger a JS garbage collection
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/// operation within the current stack frame. It is trivially copyable, so it should be passed
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/// as a function argument and reused when calling other functions whenever possible. Since it
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/// is only meaningful within the current stack frame, it is impossible to move it to a different
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/// thread or into a task that will execute asynchronously.
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pub struct CanGc(PhantomData<*mut ()>);
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impl CanGc {
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/// Create a new CanGc value, representing that a GC operation is possible within the
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/// current stack frame.
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pub fn note() -> CanGc {
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CanGc(PhantomData)
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}
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/// &mut SafeJSContext is always an indication that GC is possible.
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pub fn from_cx(_cx: &mut SafeJSContext) -> CanGc {
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CanGc::note()
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}
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}
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