Mirrors/rust-analyzer
2
0
Fork 0
mirror of https://github.com/rust-lang/rust-analyzer synced 2025-01-11 12:48:47 +00:00
Code Issues Projects Releases Packages Wiki Activity

not visit the same crateId only once

Browse source
This commit is contained in:
gfreezy 2018-12-22 15:30:58 +08:00
parent 66d15bb2da
commit 0267df3815
1 changed files with 16 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
crates/ra_db/src/input.rs
View file

@ -12,6 +12,7 @@ use rustc_hash::FxHashMap;
use salsa;
use ra_syntax::SmolStr;
use rustc_hash::FxHashSet;
/// `FileId` is an integer which uniquely identifies a file. File paths are
/// messy and system-dependent, so most of the code should work directly with
@ -94,8 +95,9 @@ impl CrateGraph {
crate_id
}
pub fn add_dep(&mut self, from: CrateId, name: SmolStr, to: CrateId) {
if self.dfs_find(from, to) {
panic!("Cycle dependencies found.")
let mut visited = FxHashSet::default();
if self.dfs_find(from, to, &mut visited) {
panic!("Cycle dependencies found.")
}
self.arena.get_mut(&from).unwrap().add_dep(name, to)
}
@ -112,35 +114,36 @@ impl CrateGraph {
pub fn dependencies<'a>(
&'a self,
crate_id: CrateId,
) -> impl Iterator<Item=&'a Dependency> + 'a {
) -> impl Iterator<Item = &'a Dependency> + 'a {
self.arena[&crate_id].dependencies.iter()
}
fn dfs_find(&self, target: CrateId, from: CrateId) -> bool {
fn dfs_find(&self, target: CrateId, from: CrateId, visited: &mut FxHashSet<CrateId>) -> bool {
if visited.contains(&from) {
return false;
}
for dep in self.dependencies(from) {
let crate_id = dep.crate_id();
if crate_id == target {
return true;
}
if self.arena.contains_key(&crate_id) {
if self.dfs_find(target, crate_id) {
return true;
}
if self.dfs_find(target, crate_id, visited) {
return true;
}
}
visited.insert(from);
return false;
}
}
#[cfg(test)]
mod tests {
use super::{CrateGraph, FxHashMap, FileId, SmolStr};
#[test]
#[should_panic]
fn it_should_painc_because_of_cycle_dependencies() {
let mut graph = CrateGraph {
arena: FxHashMap::default()
};
let mut graph = CrateGraph::default();
let crate1 = graph.add_crate_root(FileId(1u32));
let crate2 = graph.add_crate_root(FileId(2u32));
let crate3 = graph.add_crate_root(FileId(3u32));
@ -152,7 +155,7 @@ mod tests {
#[test]
fn it_works() {
let mut graph = CrateGraph {
arena: FxHashMap::default()
arena: FxHashMap::default(),
};
let crate1 = graph.add_crate_root(FileId(1u32));
let crate2 = graph.add_crate_root(FileId(2u32));
@ -162,7 +165,6 @@ mod tests {
}
}
salsa::query_group! {
pub trait FilesDatabase: salsa::Database {
/// Text of the file.