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b4079b3ff3
This is the final step of #1799, where the majority of the generated code for the JS bindings is now compiled as part of the script_bindings build step. The remaining pieces in script must live there because they refer to concrete DOM types; all code in script_bindings is generic over the [DomTypes](https://doc.servo.org/script/dom/bindings/codegen/DomTypes/trait.DomTypes.html) trait. My testing with incremental builds shows me a 12 second reduction in build times on my 2024 M4 Macbook Pro when modifying code in the script crate after these changes. Before this PR those changes took 20 seconds to rebuild Servo, and now they take 8 seconds. Testing: Existing WPT tests ensure no regressions. Fixes: #1799 --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>
96 lines
3 KiB
Rust
96 lines
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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//! Machinery to conditionally expose things.
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use js::rust::HandleObject;
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use servo_config::prefs::get;
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use crate::DomTypes;
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use crate::codegen::Globals::Globals;
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use crate::interface::is_exposed_in;
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use crate::interfaces::GlobalScopeHelpers;
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use crate::realms::{AlreadyInRealm, InRealm};
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use crate::script_runtime::JSContext;
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/// A container with a list of conditions.
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pub(crate) struct Guard<T: Clone + Copy> {
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conditions: &'static [Condition],
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value: T,
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}
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impl<T: Clone + Copy> Guard<T> {
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/// Construct a new guarded value.
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pub(crate) const fn new(conditions: &'static [Condition], value: T) -> Self {
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Guard { conditions, value }
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}
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/// Expose the value if the conditions are satisfied.
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///
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/// The passed handle is the object on which the value may be exposed.
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pub(crate) fn expose<D: DomTypes>(
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&self,
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cx: JSContext,
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obj: HandleObject,
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global: HandleObject,
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) -> Option<T> {
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let mut exposed_on_global = false;
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let conditions_satisfied = self.conditions.iter().all(|c| match c {
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Condition::Satisfied => {
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exposed_on_global = true;
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true
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},
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// If there are multiple Exposed conditions, we just need one of them to be true
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Condition::Exposed(globals) => {
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exposed_on_global |= is_exposed_in(global, *globals);
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true
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},
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_ => c.is_satisfied::<D>(cx, obj, global),
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});
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if conditions_satisfied && exposed_on_global {
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Some(self.value)
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} else {
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None
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}
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}
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}
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/// A condition to expose things.
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#[derive(Clone, Copy)]
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pub(crate) enum Condition {
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/// The condition is satisfied if the function returns true.
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Func(fn(JSContext, HandleObject) -> bool),
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/// The condition is satisfied if the preference is set.
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Pref(&'static str),
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// The condition is satisfied if the interface is exposed in the global.
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Exposed(Globals),
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SecureContext(),
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/// The condition is always satisfied.
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Satisfied,
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}
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fn is_secure_context<D: DomTypes>(cx: JSContext) -> bool {
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unsafe {
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let in_realm_proof = AlreadyInRealm::assert_for_cx(JSContext::from_ptr(*cx));
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D::GlobalScope::from_context(*cx, InRealm::Already(&in_realm_proof)).is_secure_context()
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}
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}
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impl Condition {
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pub(crate) fn is_satisfied<D: DomTypes>(
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&self,
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cx: JSContext,
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obj: HandleObject,
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global: HandleObject,
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) -> bool {
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match *self {
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Condition::Pref(name) => get().get_value(name).try_into().unwrap_or(false),
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Condition::Func(f) => f(cx, obj),
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Condition::Exposed(globals) => is_exposed_in(global, globals),
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Condition::SecureContext() => is_secure_context::<D>(cx),
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Condition::Satisfied => true,
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}
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}
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}
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