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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /servo/components/style/use_counters/mod.rs | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style/use_counters/mod.rs')
-rw-r--r-- | servo/components/style/use_counters/mod.rs | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/servo/components/style/use_counters/mod.rs b/servo/components/style/use_counters/mod.rs new file mode 100644 index 0000000000..bfa73291ee --- /dev/null +++ b/servo/components/style/use_counters/mod.rs @@ -0,0 +1,96 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ + +//! Various stuff for CSS property use counters. + +use crate::properties::{CountedUnknownProperty, COUNTED_UNKNOWN_PROPERTY_COUNT}; +use crate::properties::{NonCustomPropertyId, NON_CUSTOM_PROPERTY_ID_COUNT}; +use std::cell::Cell; + +#[cfg(target_pointer_width = "64")] +const BITS_PER_ENTRY: usize = 64; + +#[cfg(target_pointer_width = "32")] +const BITS_PER_ENTRY: usize = 32; + +/// One bit per each non-custom CSS property. +#[derive(Default)] +pub struct CountedUnknownPropertyUseCounters { + storage: [Cell<usize>; (COUNTED_UNKNOWN_PROPERTY_COUNT - 1 + BITS_PER_ENTRY) / BITS_PER_ENTRY], +} + +/// One bit per each non-custom CSS property. +#[derive(Default)] +pub struct NonCustomPropertyUseCounters { + storage: [Cell<usize>; (NON_CUSTOM_PROPERTY_ID_COUNT - 1 + BITS_PER_ENTRY) / BITS_PER_ENTRY], +} + +macro_rules! property_use_counters_methods { + ($id: ident) => { + /// Returns the bucket a given property belongs in, and the bitmask for that + /// property. + #[inline(always)] + fn bucket_and_pattern(id: $id) -> (usize, usize) { + let bit = id.bit(); + let bucket = bit / BITS_PER_ENTRY; + let bit_in_bucket = bit % BITS_PER_ENTRY; + (bucket, 1 << bit_in_bucket) + } + + /// Record that a given property ID has been parsed. + #[inline] + pub fn record(&self, id: $id) { + let (bucket, pattern) = Self::bucket_and_pattern(id); + let bucket = &self.storage[bucket]; + bucket.set(bucket.get() | pattern) + } + + /// Returns whether a given property ID has been recorded + /// earlier. + #[inline] + pub fn recorded(&self, id: $id) -> bool { + let (bucket, pattern) = Self::bucket_and_pattern(id); + self.storage[bucket].get() & pattern != 0 + } + + /// Merge `other` into `self`. + #[inline] + fn merge(&self, other: &Self) { + for (bucket, other_bucket) in self.storage.iter().zip(other.storage.iter()) { + bucket.set(bucket.get() | other_bucket.get()) + } + } + }; +} + +impl CountedUnknownPropertyUseCounters { + property_use_counters_methods!(CountedUnknownProperty); +} + +impl NonCustomPropertyUseCounters { + property_use_counters_methods!(NonCustomPropertyId); +} + +/// The use-counter data related to a given document we want to store. +#[derive(Default)] +pub struct UseCounters { + /// The counters for non-custom properties that have been parsed in the + /// document's stylesheets. + pub non_custom_properties: NonCustomPropertyUseCounters, + /// The counters for css properties which we haven't implemented yet. + pub counted_unknown_properties: CountedUnknownPropertyUseCounters, +} + +impl UseCounters { + /// Merge the use counters. + /// + /// Used for parallel parsing, where we parse off-main-thread. + #[inline] + pub fn merge(&self, other: &Self) { + self.non_custom_properties + .merge(&other.non_custom_properties); + self.counted_unknown_properties + .merge(&other.counted_unknown_properties); + } +} |