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Removed FnvHash and transformed the rest to FxHashmap (#39233)

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This should be the final PR for the Hash Function series that is
trivial.

Of note: I decided to transform `HashMapTracedValues<Atom,..>` to use
FxBuildHasher. This is likely not going to improve performance as Atom's
already have a unique u32 that is used as the Hash but it safes a few
bytes for the RandomState that is normally in the HashMap.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

Testing: Hash function changes should not change functionality, we
slightly decrease the size and unit tests still work.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
This commit is contained in:
Narfinger 2025-09-10 15:34:54 +02:00 • committed by GitHub
parent 726b456120
commit 84465e7768
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55 changed files with 211 additions and 202 deletions
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37
components/constellation/constellation.rs
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@ -139,7 +139,6 @@ use embedder_traits::{
};
use euclid::Size2D;
use euclid::default::Size2D as UntypedSize2D;
use fnv::{FnvHashMap, FnvHashSet};
use fonts::SystemFontServiceProxy;
use ipc_channel::Error as IpcError;
use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
@ -157,6 +156,7 @@ use net_traits::{
};
use profile_traits::mem::ProfilerMsg;
use profile_traits::{mem, time};
use rustc_hash::{FxHashMap, FxHashSet};
use script_traits::{
ConstellationInputEvent, DiscardBrowsingContext, DocumentActivity, ProgressiveWebMetricType,
ScriptThreadMessage, UpdatePipelineIdReason,
@ -190,7 +190,7 @@ use crate::session_history::{
};
use crate::webview_manager::WebViewManager;
type PendingApprovalNavigations = HashMap<PipelineId, (LoadData, NavigationHistoryBehavior)>;
type PendingApprovalNavigations = FxHashMap<PipelineId, (LoadData, NavigationHistoryBehavior)>;
#[derive(Debug)]
/// The state used by MessagePortInfo to represent the various states the port can be in.
@ -241,7 +241,7 @@ struct WebrenderWGPU {
#[derive(Clone, Default)]
struct BrowsingContextGroup {
/// A browsing context group holds a set of top-level browsing contexts.
top_level_browsing_context_set: FnvHashSet<WebViewId>,
top_level_browsing_context_set: FxHashSet<WebViewId>,
/// The set of all event loops in this BrowsingContextGroup.
/// We store the event loops in a map
@ -385,25 +385,25 @@ pub struct Constellation<STF, SWF> {
webrender_wgpu: WebrenderWGPU,
/// A map of message-port Id to info.
message_ports: FnvHashMap<MessagePortId, MessagePortInfo>,
message_ports: FxHashMap<MessagePortId, MessagePortInfo>,
/// A map of router-id to ipc-sender, to route messages to ports.
message_port_routers: FnvHashMap<MessagePortRouterId, IpcSender<MessagePortMsg>>,
message_port_routers: FxHashMap<MessagePortRouterId, IpcSender<MessagePortMsg>>,
/// Bookkeeping for BroadcastChannel functionnality.
broadcast_channels: BroadcastChannels,
/// The set of all the pipelines in the browser. (See the `pipeline` module
/// for more details.)
pipelines: FnvHashMap<PipelineId, Pipeline>,
pipelines: FxHashMap<PipelineId, Pipeline>,
/// The set of all the browsing contexts in the browser.
browsing_contexts: FnvHashMap<BrowsingContextId, BrowsingContext>,
browsing_contexts: FxHashMap<BrowsingContextId, BrowsingContext>,
/// A user agent holds a a set of browsing context groups.
///
/// <https://html.spec.whatwg.org/multipage/#browsing-context-group-set>
browsing_context_group_set: FnvHashMap<BrowsingContextGroupId, BrowsingContextGroup>,
browsing_context_group_set: FxHashMap<BrowsingContextGroupId, BrowsingContextGroup>,
/// The Id counter for BrowsingContextGroup.
browsing_context_group_next_id: u32,
@ -426,7 +426,7 @@ pub struct Constellation<STF, SWF> {
webdriver_input_command_reponse_sender: Option<IpcSender<WebDriverCommandResponse>>,
/// Document states for loaded pipelines (used only when writing screenshots).
document_states: FnvHashMap<PipelineId, DocumentState>,
document_states: FxHashMap<PipelineId, DocumentState>,
/// Are we shutting down?
shutting_down: bool,
@ -482,7 +482,7 @@ pub struct Constellation<STF, SWF> {
async_runtime: Box<dyn AsyncRuntime>,
/// When in single-process mode, join handles for script-threads.
script_join_handles: FnvHashMap<WebViewId, JoinHandle<()>>,
script_join_handles: FxHashMap<WebViewId, JoinHandle<()>>,
/// A list of URLs that can access privileged internal APIs.
privileged_urls: Vec<ServoUrl>,
@ -2120,7 +2120,7 @@ where
fn handle_message_port_transfer_failed(
&mut self,
ports: FnvHashMap<MessagePortId, PortTransferInfo>,
ports: FxHashMap<MessagePortId, PortTransferInfo>,
) {
for (port_id, mut transfer_info) in ports.into_iter() {
let entry = match self.message_ports.remove(&port_id) {
@ -2202,7 +2202,7 @@ where
router_id: MessagePortRouterId,
ports: Vec<MessagePortId>,
) {
let mut response = FnvHashMap::default();
let mut response = FxHashMap::default();
for port_id in ports.into_iter() {
let entry = match self.message_ports.remove(&port_id) {
None => {
@ -3785,11 +3785,10 @@ where
webview_id: WebViewId,
direction: TraversalDirection,
) {
let mut browsing_context_changes =
FnvHashMap::<BrowsingContextId, NeedsToReload>::default();
let mut browsing_context_changes = FxHashMap::<BrowsingContextId, NeedsToReload>::default();
let mut pipeline_changes =
FnvHashMap::<PipelineId, (Option<HistoryStateId>, ServoUrl)>::default();
let mut url_to_load = FnvHashMap::<PipelineId, ServoUrl>::default();
FxHashMap::<PipelineId, (Option<HistoryStateId>, ServoUrl)>::default();
let mut url_to_load = FxHashMap::<PipelineId, ServoUrl>::default();
{
let session_history = self.get_joint_session_history(webview_id);
match direction {
@ -4792,7 +4791,7 @@ where
};
let mut pipelines_to_close = vec![];
let mut states_to_close = FnvHashMap::default();
let mut states_to_close = FxHashMap::default();
let diffs_to_close = self
.get_joint_session_history(change.webview_id)
@ -5049,7 +5048,7 @@ where
#[servo_tracing::instrument(skip_all)]
fn handle_is_ready_to_save_image(
&mut self,
pipeline_states: FnvHashMap<PipelineId, Epoch>,
pipeline_states: FxHashMap<PipelineId, Epoch>,
) -> ReadyToSave {
// Note that this function can panic, due to ipc-channel creation
// failure. Avoiding this panic would require a mechanism for dealing
@ -5593,7 +5592,7 @@ where
fn handle_set_scroll_states(
&self,
pipeline_id: PipelineId,
scroll_states: FnvHashMap<ExternalScrollId, LayoutVector2D>,
scroll_states: FxHashMap<ExternalScrollId, LayoutVector2D>,
) {
let Some(pipeline) = self.pipelines.get(&pipeline_id) else {
warn!("Discarding scroll offset update for unknown pipeline");