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https://github.com/servo/servo
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8757ccbc8d
As in https://github.com/servo/servo/pull/42715 we will need cx in drop so we need to go to function wrapper pattern. Testing: Just refactor should be covered by WPT tests. --------- Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
109 lines
3.8 KiB
Rust
109 lines
3.8 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::thread;
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use js::jsapi::{HideScriptedCaller, UnhideScriptedCaller};
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use js::rust::Runtime;
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use crate::DomTypes;
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use crate::interfaces::{DomHelpers, GlobalScopeHelpers};
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use crate::root::Dom;
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use crate::script_runtime::temp_cx;
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#[derive(Debug, Eq, JSTraceable, PartialEq)]
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pub enum StackEntryKind {
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Incumbent,
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Entry,
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}
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#[cfg_attr(crown, expect(crown::unrooted_must_root))]
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#[derive(JSTraceable)]
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pub struct StackEntry<D: DomTypes> {
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pub global: Dom<D::GlobalScope>,
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pub kind: StackEntryKind,
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}
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/// Wrapper that pushes and pops entries from the script settings stack.
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///
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/// <https://html.spec.whatwg.org/multipage/#prepare-to-run-script>
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/// <https://html.spec.whatwg.org/multipage/#clean-up-after-running-script>
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pub fn run_a_script<D: DomTypes, R>(global: &D::GlobalScope, f: impl FnOnce() -> R) -> R {
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let settings_stack = <D as DomHelpers<D>>::settings_stack();
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let _span = settings_stack.with(|stack| {
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trace!("Prepare to run script with {:p}", global);
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let mut stack = stack.borrow_mut();
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stack.push(StackEntry {
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global: Dom::from_ref(global),
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kind: StackEntryKind::Entry,
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});
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profile_traits::info_span!("ScriptEvaluate", url = global.get_url().to_string()).entered()
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});
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let result = f();
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let stack_is_empty = settings_stack.with(|stack| {
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let mut stack = stack.borrow_mut();
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let entry = stack.pop().unwrap();
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assert_eq!(
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&*entry.global as *const D::GlobalScope, global as *const D::GlobalScope,
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"Dropped AutoEntryScript out of order."
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);
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assert_eq!(entry.kind, StackEntryKind::Entry);
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trace!("Clean up after running script with {:p}", &*entry.global);
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stack.is_empty()
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});
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// Step 5
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if !thread::panicking() && stack_is_empty {
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let mut cx = unsafe { temp_cx() };
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global.perform_a_microtask_checkpoint(&mut cx);
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}
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result
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}
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/// Wrapper that pushes and pops entries from the script settings stack.
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///
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/// <https://html.spec.whatwg.org/multipage/#prepare-to-run-a-callback>
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/// <https://html.spec.whatwg.org/multipage/#clean-up-after-running-a-callback>
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pub fn run_a_callback<D: DomTypes, R>(global: &D::GlobalScope, f: impl FnOnce() -> R) -> R {
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let settings_stack = <D as DomHelpers<D>>::settings_stack();
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let cx = Runtime::get().expect("Creating a new incumbent script after runtime shutdown");
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// <https://html.spec.whatwg.org/multipage/#prepare-to-run-a-callback>
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// Step 2-3.
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unsafe {
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HideScriptedCaller(cx.as_ptr());
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}
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settings_stack.with(|stack| {
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trace!("Prepare to run a callback with {:p}", global);
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// Step 1.
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let mut stack = stack.borrow_mut();
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stack.push(StackEntry {
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global: Dom::from_ref(global),
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kind: StackEntryKind::Incumbent,
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});
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});
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let result = f();
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// <https://html.spec.whatwg.org/multipage/#clean-up-after-running-a-callback>
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settings_stack.with(|stack| {
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// Step 4.
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let mut stack = stack.borrow_mut();
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let entry = stack.pop().unwrap();
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// Step 3.
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assert_eq!(
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&*entry.global as *const D::GlobalScope as usize,
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global as *const D::GlobalScope as usize,
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"Dropped AutoIncumbentScript out of order."
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);
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assert_eq!(entry.kind, StackEntryKind::Incumbent);
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trace!(
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"Clean up after running a callback with {:p}",
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&*entry.global
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);
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});
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unsafe {
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// Step 1-2.
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UnhideScriptedCaller(cx.as_ptr());
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}
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result
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}
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