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use rustc::dep_graph::DepNode;
use rustc::hir::def_id::DefId;
use rustc::hir::svh::Svh;
use rustc::session::Session;
use rustc::ty::TyCtxt;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::graph::{NodeIndex, INCOMING};
use rustc_serialize::Encodable as RustcEncodable;
use rustc_serialize::opaque::Encoder;
use std::hash::Hash;
use std::io::{self, Cursor, Write};
use std::fs::{self, File};
use std::path::PathBuf;
use IncrementalHashesMap;
use ich::Fingerprint;
use super::data::*;
use super::directory::*;
use super::hash::*;
use super::preds::*;
use super::fs::*;
use super::dirty_clean;
use super::file_format;
use super::work_product;
use calculate_svh::IchHasher;
pub fn save_dep_graph<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
incremental_hashes_map: &IncrementalHashesMap,
svh: Svh) {
debug!("save_dep_graph()");
let _ignore = tcx.dep_graph.in_ignore();
let sess = tcx.sess;
if sess.opts.incremental.is_none() {
return;
}
let mut builder = DefIdDirectoryBuilder::new(tcx);
let query = tcx.dep_graph.query();
if tcx.sess.opts.debugging_opts.incremental_info {
println!("incremental: {} nodes in dep-graph", query.graph.len_nodes());
println!("incremental: {} edges in dep-graph", query.graph.len_edges());
}
let mut hcx = HashContext::new(tcx, incremental_hashes_map);
let preds = Predecessors::new(&query, &mut hcx);
let mut current_metadata_hashes = FxHashMap();
if sess.opts.debugging_opts.incremental_cc ||
sess.opts.debugging_opts.query_dep_graph {
save_in(sess,
metadata_hash_export_path(sess),
|e| encode_metadata_hashes(tcx,
svh,
&preds,
&mut builder,
&mut current_metadata_hashes,
e));
}
save_in(sess,
dep_graph_path(sess),
|e| encode_dep_graph(&preds, &mut builder, e));
let prev_metadata_hashes = incremental_hashes_map.prev_metadata_hashes.borrow();
dirty_clean::check_dirty_clean_metadata(tcx,
&*prev_metadata_hashes,
¤t_metadata_hashes);
}
pub fn save_work_products(sess: &Session) {
if sess.opts.incremental.is_none() {
return;
}
debug!("save_work_products()");
let _ignore = sess.dep_graph.in_ignore();
let path = work_products_path(sess);
save_in(sess, path, |e| encode_work_products(sess, e));
let new_work_products = sess.dep_graph.work_products();
let previous_work_products = sess.dep_graph.previous_work_products();
for (id, wp) in previous_work_products.iter() {
if !new_work_products.contains_key(id) {
work_product::delete_workproduct_files(sess, wp);
debug_assert!(wp.saved_files.iter().all(|&(_, ref file_name)| {
!in_incr_comp_dir_sess(sess, file_name).exists()
}));
}
}
debug_assert!({
new_work_products.iter()
.flat_map(|(_, wp)| wp.saved_files
.iter()
.map(|&(_, ref name)| name))
.map(|name| in_incr_comp_dir_sess(sess, name))
.all(|path| path.exists())
});
}
fn save_in<F>(sess: &Session, path_buf: PathBuf, encode: F)
where F: FnOnce(&mut Encoder) -> io::Result<()>
{
debug!("save: storing data in {}", path_buf.display());
if path_buf.exists() {
match fs::remove_file(&path_buf) {
Ok(()) => {
debug!("save: remove old file");
}
Err(err) => {
sess.err(&format!("unable to delete old dep-graph at `{}`: {}",
path_buf.display(),
err));
return;
}
}
}
let mut wr = Cursor::new(Vec::new());
file_format::write_file_header(&mut wr).unwrap();
match encode(&mut Encoder::new(&mut wr)) {
Ok(()) => {}
Err(err) => {
sess.err(&format!("could not encode dep-graph to `{}`: {}",
path_buf.display(),
err));
return;
}
}
let data = wr.into_inner();
match File::create(&path_buf).and_then(|mut file| file.write_all(&data)) {
Ok(_) => {
debug!("save: data written to disk successfully");
}
Err(err) => {
sess.err(&format!("failed to write dep-graph to `{}`: {}",
path_buf.display(),
err));
return;
}
}
}
pub fn encode_dep_graph(preds: &Predecessors,
builder: &mut DefIdDirectoryBuilder,
encoder: &mut Encoder)
-> io::Result<()> {
let tcx = builder.tcx();
tcx.sess.opts.dep_tracking_hash().encode(encoder)?;
let mut edges = FxHashMap();
for edge in preds.reduced_graph.all_edges() {
let source = *preds.reduced_graph.node_data(edge.source());
let target = *preds.reduced_graph.node_data(edge.target());
match *target {
DepNode::MetaData(ref def_id) => {
assert!(def_id.is_local());
continue;
}
_ => (),
}
debug!("serialize edge: {:?} -> {:?}", source, target);
let source = builder.map(source);
let target = builder.map(target);
edges.entry(source).or_insert(vec![]).push(target);
}
if tcx.sess.opts.debugging_opts.incremental_dump_hash {
for (dep_node, hash) in &preds.hashes {
println!("HIR hash for {:?} is {}", dep_node, hash);
}
}
let bootstrap_outputs = preds.bootstrap_outputs.iter()
.map(|n| builder.map(n))
.collect();
let edges = edges.into_iter()
.map(|(k, v)| SerializedEdgeSet { source: k, targets: v })
.collect();
let graph = SerializedDepGraph {
bootstrap_outputs,
edges,
hashes: preds.hashes
.iter()
.map(|(&dep_node, &hash)| {
SerializedHash {
dep_node: builder.map(dep_node),
hash: hash,
}
})
.collect(),
};
if tcx.sess.opts.debugging_opts.incremental_info {
println!("incremental: {} nodes in reduced dep-graph", preds.reduced_graph.len_nodes());
println!("incremental: {} edges in serialized dep-graph", graph.edges.len());
println!("incremental: {} hashes in serialized dep-graph", graph.hashes.len());
}
debug!("graph = {:#?}", graph);
builder.directory().encode(encoder)?;
graph.encode(encoder)?;
Ok(())
}
pub fn encode_metadata_hashes(tcx: TyCtxt,
svh: Svh,
preds: &Predecessors,
builder: &mut DefIdDirectoryBuilder,
current_metadata_hashes: &mut FxHashMap<DefId, Fingerprint>,
encoder: &mut Encoder)
-> io::Result<()> {
let mut serialized_hashes = SerializedMetadataHashes {
hashes: vec![],
index_map: FxHashMap()
};
let mut def_id_hashes = FxHashMap();
for (index, target) in preds.reduced_graph.all_nodes().iter().enumerate() {
let index = NodeIndex(index);
let def_id = match *target.data {
DepNode::MetaData(def_id) if def_id.is_local() => def_id,
_ => continue,
};
let mut def_id_hash = |def_id: DefId| -> u64 {
*def_id_hashes.entry(def_id)
.or_insert_with(|| {
let index = builder.add(def_id);
let path = builder.lookup_def_path(index);
path.deterministic_hash(tcx)
})
};
debug!("save: computing metadata hash for {:?}", def_id);
let mut hashes: Vec<(DepNode<u64>, Fingerprint)> =
preds.reduced_graph
.depth_traverse(index, INCOMING)
.map(|index| preds.reduced_graph.node_data(index))
.filter(|dep_node| HashContext::is_hashable(dep_node))
.map(|dep_node| {
let hash_dep_node = dep_node.map_def(|&def_id| Some(def_id_hash(def_id)))
.unwrap();
let hash = preds.hashes[dep_node];
(hash_dep_node, hash)
})
.collect();
hashes.sort();
let mut state = IchHasher::new();
hashes.hash(&mut state);
let hash = state.finish();
debug!("save: metadata hash for {:?} is {}", def_id, hash);
if tcx.sess.opts.debugging_opts.incremental_dump_hash {
println!("metadata hash for {:?} is {}", def_id, hash);
for pred_index in preds.reduced_graph.depth_traverse(index, INCOMING) {
let dep_node = preds.reduced_graph.node_data(pred_index);
if HashContext::is_hashable(&dep_node) {
println!("metadata hash for {:?} depends on {:?} with hash {}",
def_id, dep_node, preds.hashes[dep_node]);
}
}
}
serialized_hashes.hashes.push(SerializedMetadataHash {
def_index: def_id.index,
hash: hash,
});
}
if tcx.sess.opts.debugging_opts.query_dep_graph {
for serialized_hash in &serialized_hashes.hashes {
let def_id = DefId::local(serialized_hash.def_index);
let def_path_index = builder.add(def_id);
serialized_hashes.index_map.insert(def_id.index, def_path_index);
current_metadata_hashes.insert(def_id, serialized_hash.hash);
}
debug!("save: stored index_map (len={}) for serialized hashes",
serialized_hashes.index_map.len());
}
svh.encode(encoder)?;
serialized_hashes.encode(encoder)?;
Ok(())
}
pub fn encode_work_products(sess: &Session, encoder: &mut Encoder) -> io::Result<()> {
let work_products: Vec<_> = sess.dep_graph
.work_products()
.iter()
.map(|(id, work_product)| {
SerializedWorkProduct {
id: id.clone(),
work_product: work_product.clone(),
}
})
.collect();
work_products.encode(encoder)
}