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86b4b70369
This was consistently faster in the benchmark (even when counters were disabled, which was slightly suspicious, but...). Anyway, it's not really much code, most of it is FFI copy-pasta. Differential Revision: https://phabricator.services.mozilla.com/D3874
87 lines
2.8 KiB
Rust
87 lines
2.8 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 http://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 gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
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use 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 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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impl NonCustomPropertyUseCounters {
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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: NonCustomPropertyId) -> (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 non-custom property ID has been parsed.
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#[inline]
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pub fn record(&self, id: NonCustomPropertyId) {
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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 non-custom property ID has been recorded
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/// earlier.
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#[inline]
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pub fn recorded(&self, id: NonCustomPropertyId) -> 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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/// 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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}
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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.merge(&other.non_custom_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 = ::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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