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|
use std::sync::Arc;
use ide_db::{
base_db::{salsa::Durability, CrateGraph, SourceDatabase},
FxHashMap, RootDatabase,
};
// Feature: Shuffle Crate Graph
//
// Randomizes all crate IDs in the crate graph, for debugging.
//
// |===
// | Editor | Action Name
//
// | VS Code | **rust-analyzer: Shuffle Crate Graph**
// |===
pub(crate) fn shuffle_crate_graph(db: &mut RootDatabase) {
let crate_graph = db.crate_graph();
let mut shuffled_ids = crate_graph.iter().collect::<Vec<_>>();
shuffle(&mut shuffled_ids);
let mut new_graph = CrateGraph::default();
let mut map = FxHashMap::default();
for old_id in shuffled_ids.iter().copied() {
let data = &crate_graph[old_id];
let new_id = new_graph.add_crate_root(
data.root_file_id,
data.edition,
data.display_name.clone(),
data.version.clone(),
data.cfg_options.clone(),
data.potential_cfg_options.clone(),
data.env.clone(),
data.proc_macro.clone(),
data.is_proc_macro,
data.origin.clone(),
data.target_layout.clone(),
);
map.insert(old_id, new_id);
}
for old_id in shuffled_ids.iter().copied() {
let data = &crate_graph[old_id];
for dep in &data.dependencies {
let mut new_dep = dep.clone();
new_dep.crate_id = map[&dep.crate_id];
new_graph.add_dep(map[&old_id], new_dep).unwrap();
}
}
db.set_crate_graph_with_durability(Arc::new(new_graph), Durability::HIGH);
}
fn shuffle<T>(slice: &mut [T]) {
let mut rng = oorandom::Rand32::new(seed());
let mut remaining = slice.len() - 1;
while remaining > 0 {
let index = rng.rand_range(0..remaining as u32);
slice.swap(remaining, index as usize);
remaining -= 1;
}
}
fn seed() -> u64 {
use std::collections::hash_map::RandomState;
use std::hash::{BuildHasher, Hasher};
RandomState::new().build_hasher().finish()
}
|
