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use rustc::dep_graph::DepNode;
use rustc::hir::map::DefPath;
use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
use rustc::ty::TyCtxt;
use rustc::util::nodemap::DefIdMap;
use std::fmt::{self, Debug};
use std::iter::once;
use std::collections::HashMap;
#[derive(Copy, Clone, Debug, PartialOrd, Ord, Hash, PartialEq, Eq,
RustcEncodable, RustcDecodable)]
pub struct DefPathIndex {
index: u32
}
#[derive(RustcEncodable, RustcDecodable)]
pub struct DefIdDirectory {
paths: Vec<DefPath>,
krates: Vec<CrateInfo>,
}
#[derive(Debug, RustcEncodable, RustcDecodable)]
pub struct CrateInfo {
krate: CrateNum,
name: String,
disambiguator: String,
}
impl DefIdDirectory {
pub fn new(krates: Vec<CrateInfo>) -> DefIdDirectory {
DefIdDirectory { paths: vec![], krates: krates }
}
fn max_current_crate(&self, tcx: TyCtxt) -> CrateNum {
tcx.sess.cstore.crates()
.into_iter()
.max()
.unwrap_or(LOCAL_CRATE)
}
pub fn def_path_string(&self, tcx: TyCtxt, index: DefPathIndex) -> String {
let path = &self.paths[index.index as usize];
if self.krate_still_valid(tcx, self.max_current_crate(tcx), path.krate) {
path.to_string(tcx)
} else {
format!("<crate {} changed>", path.krate)
}
}
pub fn krate_still_valid(&self,
tcx: TyCtxt,
max_current_crate: CrateNum,
krate: CrateNum) -> bool {
if krate > max_current_crate {
false
} else {
let old_info = &self.krates[krate.as_usize()];
assert_eq!(old_info.krate, krate);
let old_name: &str = &old_info.name;
let old_disambiguator: &str = &old_info.disambiguator;
let new_name: &str = &tcx.crate_name(krate).as_str();
let new_disambiguator: &str = &tcx.crate_disambiguator(krate).as_str();
old_name == new_name && old_disambiguator == new_disambiguator
}
}
pub fn retrace(&self, tcx: TyCtxt) -> RetracedDefIdDirectory {
fn make_key(name: &str, disambiguator: &str) -> String {
format!("{}/{}", name, disambiguator)
}
let new_krates: HashMap<_, _> =
once(LOCAL_CRATE)
.chain(tcx.sess.cstore.crates())
.map(|krate| (make_key(&tcx.crate_name(krate).as_str(),
&tcx.crate_disambiguator(krate).as_str()), krate))
.collect();
let ids = self.paths.iter()
.map(|path| {
let old_krate_id = path.krate.as_usize();
assert!(old_krate_id < self.krates.len());
let old_crate_info = &self.krates[old_krate_id];
let old_crate_key = make_key(&old_crate_info.name,
&old_crate_info.disambiguator);
if let Some(&new_crate_key) = new_krates.get(&old_crate_key) {
tcx.retrace_path(new_crate_key, &path.data)
} else {
debug!("crate {:?} no longer exists", old_crate_key);
None
}
})
.collect();
RetracedDefIdDirectory { ids: ids }
}
}
#[derive(Debug, RustcEncodable, RustcDecodable)]
pub struct RetracedDefIdDirectory {
ids: Vec<Option<DefId>>
}
impl RetracedDefIdDirectory {
pub fn def_id(&self, index: DefPathIndex) -> Option<DefId> {
self.ids[index.index as usize]
}
pub fn map(&self, node: &DepNode<DefPathIndex>) -> Option<DepNode<DefId>> {
node.map_def(|&index| self.def_id(index))
}
}
pub struct DefIdDirectoryBuilder<'a,'tcx:'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>,
hash: DefIdMap<DefPathIndex>,
directory: DefIdDirectory,
}
impl<'a,'tcx> DefIdDirectoryBuilder<'a,'tcx> {
pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> DefIdDirectoryBuilder<'a, 'tcx> {
let mut krates: Vec<_> =
once(LOCAL_CRATE)
.chain(tcx.sess.cstore.crates())
.map(|krate| {
CrateInfo {
krate: krate,
name: tcx.crate_name(krate).to_string(),
disambiguator: tcx.crate_disambiguator(krate).to_string()
}
})
.collect();
krates.sort_by_key(|k| k.krate);
DefIdDirectoryBuilder {
tcx: tcx,
hash: DefIdMap(),
directory: DefIdDirectory::new(krates),
}
}
pub fn tcx(&self) -> TyCtxt<'a, 'tcx, 'tcx> {
self.tcx
}
pub fn add(&mut self, def_id: DefId) -> DefPathIndex {
debug!("DefIdDirectoryBuilder: def_id={:?}", def_id);
let tcx = self.tcx;
let paths = &mut self.directory.paths;
self.hash.entry(def_id)
.or_insert_with(|| {
let def_path = tcx.def_path(def_id);
let index = paths.len() as u32;
paths.push(def_path);
DefPathIndex { index: index }
})
.clone()
}
pub fn lookup_def_path(&self, id: DefPathIndex) -> &DefPath {
&self.directory.paths[id.index as usize]
}
pub fn map(&mut self, node: &DepNode<DefId>) -> DepNode<DefPathIndex> {
node.map_def(|&def_id| Some(self.add(def_id))).unwrap()
}
pub fn directory(&self) -> &DefIdDirectory {
&self.directory
}
}
impl Debug for DefIdDirectory {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt.debug_list()
.entries(self.paths.iter().enumerate())
.finish()
}
}