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c3a3bd48d7
For developing properties, we will handle them in an other bug. Besides, I use an iframe for the test because we create a use counter in the constructor of Document, which use the prefs to decide what kind of properties we want to record. So, in the test, we have to reload iframe to make sure we re-create the document, so does the use counter, to make sure the prefs work properly. The two prefs affect the css use counters: 1. layout.css.use-counters.enabled: Allocate use counters, and record non-custom properties. 2. layout.css.use-counters-unimplemented.enabled: Record all unimplmented properties into the use counters. If we disable layout.css.use-counters.enblaed, we don't create use counters object, so layout.css.use-counters-unimplemented.enabled doesn't work, either. Differential Revision: https://phabricator.services.mozilla.com/D43860
109 lines
3.6 KiB
Rust
109 lines
3.6 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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//! Various stuff for CSS property use counters.
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#[cfg(feature = "gecko")]
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use crate::gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
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use crate::properties::{CountedUnknownProperty, COUNTED_UNKNOWN_PROPERTY_COUNT};
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use crate::properties::{NonCustomPropertyId, NON_CUSTOM_PROPERTY_ID_COUNT};
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use std::cell::Cell;
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#[cfg(target_pointer_width = "64")]
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const BITS_PER_ENTRY: usize = 64;
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#[cfg(target_pointer_width = "32")]
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const BITS_PER_ENTRY: usize = 32;
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/// One bit per each non-custom CSS property.
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#[derive(Default)]
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pub struct CountedUnknownPropertyUseCounters {
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storage: [Cell<usize>; (COUNTED_UNKNOWN_PROPERTY_COUNT - 1 + BITS_PER_ENTRY) / BITS_PER_ENTRY],
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}
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/// One bit per each non-custom CSS property.
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#[derive(Default)]
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pub struct NonCustomPropertyUseCounters {
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storage: [Cell<usize>; (NON_CUSTOM_PROPERTY_ID_COUNT - 1 + BITS_PER_ENTRY) / BITS_PER_ENTRY],
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}
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macro_rules! property_use_counters_methods {
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($id: ident) => {
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/// Returns the bucket a given property belongs in, and the bitmask for that
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/// property.
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#[inline(always)]
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fn bucket_and_pattern(id: $id) -> (usize, usize) {
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let bit = id.bit();
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let bucket = bit / BITS_PER_ENTRY;
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let bit_in_bucket = bit % BITS_PER_ENTRY;
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(bucket, 1 << bit_in_bucket)
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}
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/// Record that a given property ID has been parsed.
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#[inline]
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pub fn record(&self, id: $id) {
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let (bucket, pattern) = Self::bucket_and_pattern(id);
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let bucket = &self.storage[bucket];
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bucket.set(bucket.get() | pattern)
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}
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/// Returns whether a given property ID has been recorded
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/// earlier.
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#[inline]
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pub fn recorded(&self, id: $id) -> bool {
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let (bucket, pattern) = Self::bucket_and_pattern(id);
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self.storage[bucket].get() & pattern != 0
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}
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/// Merge `other` into `self`.
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#[inline]
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fn merge(&self, other: &Self) {
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for (bucket, other_bucket) in self.storage.iter().zip(other.storage.iter()) {
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bucket.set(bucket.get() | other_bucket.get())
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}
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}
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};
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}
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impl CountedUnknownPropertyUseCounters {
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property_use_counters_methods!(CountedUnknownProperty);
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}
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impl NonCustomPropertyUseCounters {
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property_use_counters_methods!(NonCustomPropertyId);
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}
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/// The use-counter data related to a given document we want to store.
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#[derive(Default)]
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pub struct UseCounters {
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/// The counters for non-custom properties that have been parsed in the
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/// document's stylesheets.
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pub non_custom_properties: NonCustomPropertyUseCounters,
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/// The counters for css properties which we haven't implemented yet.
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pub counted_unknown_properties: CountedUnknownPropertyUseCounters,
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}
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impl UseCounters {
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/// Merge the use counters.
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///
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/// Used for parallel parsing, where we parse off-main-thread.
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#[inline]
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pub fn merge(&self, other: &Self) {
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self.non_custom_properties
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.merge(&other.non_custom_properties);
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self.counted_unknown_properties
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.merge(&other.counted_unknown_properties);
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}
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}
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#[cfg(feature = "gecko")]
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unsafe impl HasFFI for UseCounters {
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type FFIType = crate::gecko_bindings::structs::StyleUseCounters;
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}
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#[cfg(feature = "gecko")]
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unsafe impl HasSimpleFFI for UseCounters {}
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#[cfg(feature = "gecko")]
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unsafe impl HasBoxFFI for UseCounters {}
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