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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /servo/components/style/use_counters
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.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')
-rw-r--r--servo/components/style/use_counters/mod.rs96
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
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+/* 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);
+ }
+}