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use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sync::join;
use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
use rustc_middle::ty::TyCtxt;
use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
use rustc_serialize::Encodable as RustcEncodable;
use rustc_session::Session;
use std::fs;
use std::io;
use std::path::PathBuf;
use super::data::*;
use super::dirty_clean;
use super::file_format;
use super::fs::*;
use super::work_product;
pub fn save_dep_graph(tcx: TyCtxt<'_>) {
debug!("save_dep_graph()");
tcx.dep_graph.with_ignore(|| {
let sess = tcx.sess;
if sess.opts.incremental.is_none() {
return;
}
// This is going to be deleted in finalize_session_directory, so let's not create it
if sess.has_errors_or_delayed_span_bugs() {
return;
}
let query_cache_path = query_cache_path(sess);
let dep_graph_path = dep_graph_path(sess);
join(
move || {
sess.time("incr_comp_persist_result_cache", || {
save_in(sess, query_cache_path, "query cache", |e| encode_query_cache(tcx, e));
});
},
|| {
sess.time("incr_comp_persist_dep_graph", || {
save_in(sess, dep_graph_path, "dependency graph", |e| {
sess.time("incr_comp_encode_dep_graph", || encode_dep_graph(tcx, e))
});
});
},
);
dirty_clean::check_dirty_clean_annotations(tcx);
})
}
pub fn save_work_product_index(
sess: &Session,
dep_graph: &DepGraph,
new_work_products: FxHashMap<WorkProductId, WorkProduct>,
) {
if sess.opts.incremental.is_none() {
return;
}
// This is going to be deleted in finalize_session_directory, so let's not create it
if sess.has_errors_or_delayed_span_bugs() {
return;
}
debug!("save_work_product_index()");
dep_graph.assert_ignored();
let path = work_products_path(sess);
save_in(sess, path, "work product index", |e| encode_work_product_index(&new_work_products, e));
// We also need to clean out old work-products, as not all of them are
// deleted during invalidation. Some object files don't change their
// content, they are just not needed anymore.
let previous_work_products = 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_file.as_ref().map_or(true, |file_name| {
!in_incr_comp_dir_sess(sess, &file_name).exists()
})
);
}
}
// Check that we did not delete one of the current work-products:
debug_assert!({
new_work_products
.iter()
.flat_map(|(_, wp)| wp.saved_file.iter())
.map(|name| in_incr_comp_dir_sess(sess, name))
.all(|path| path.exists())
});
}
fn save_in<F>(sess: &Session, path_buf: PathBuf, name: &str, encode: F)
where
F: FnOnce(&mut FileEncoder) -> FileEncodeResult,
{
debug!("save: storing data in {}", path_buf.display());
// Delete the old file, if any.
// Note: It's important that we actually delete the old file and not just
// truncate and overwrite it, since it might be a shared hard-link, the
// underlying data of which we don't want to modify
match fs::remove_file(&path_buf) {
Ok(()) => {
debug!("save: remove old file");
}
Err(err) if err.kind() == io::ErrorKind::NotFound => (),
Err(err) => {
sess.err(&format!(
"unable to delete old {} at `{}`: {}",
name,
path_buf.display(),
err
));
return;
}
}
let mut encoder = match FileEncoder::new(&path_buf) {
Ok(encoder) => encoder,
Err(err) => {
sess.err(&format!("failed to create {} at `{}`: {}", name, path_buf.display(), err));
return;
}
};
if let Err(err) = file_format::write_file_header(&mut encoder, sess.is_nightly_build()) {
sess.err(&format!("failed to write {} header to `{}`: {}", name, path_buf.display(), err));
return;
}
if let Err(err) = encode(&mut encoder) {
sess.err(&format!("failed to write {} to `{}`: {}", name, path_buf.display(), err));
return;
}
if let Err(err) = encoder.flush() {
sess.err(&format!("failed to flush {} to `{}`: {}", name, path_buf.display(), err));
return;
}
debug!("save: data written to disk successfully");
}
fn encode_dep_graph(tcx: TyCtxt<'_>, encoder: &mut FileEncoder) -> FileEncodeResult {
// First encode the commandline arguments hash
tcx.sess.opts.dep_tracking_hash().encode(encoder)?;
if tcx.sess.opts.debugging_opts.incremental_info {
tcx.dep_graph.print_incremental_info();
}
// There is a tiny window between printing the incremental info above and encoding the dep
// graph below in which the dep graph could change, thus making the printed incremental info
// slightly out of date. If this matters to you, please feel free to submit a patch. :)
tcx.sess.time("incr_comp_encode_serialized_dep_graph", || tcx.dep_graph.encode(encoder))
}
fn encode_work_product_index(
work_products: &FxHashMap<WorkProductId, WorkProduct>,
encoder: &mut FileEncoder,
) -> FileEncodeResult {
let serialized_products: Vec<_> = work_products
.iter()
.map(|(id, work_product)| SerializedWorkProduct {
id: *id,
work_product: work_product.clone(),
})
.collect();
serialized_products.encode(encoder)
}
fn encode_query_cache(tcx: TyCtxt<'_>, encoder: &mut FileEncoder) -> FileEncodeResult {
tcx.sess.time("incr_comp_serialize_result_cache", || tcx.serialize_query_result_cache(encoder))
}
|
