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use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sync::join;
use rustc_middle::dep_graph::{DepGraph, SerializedDepGraph, 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 super::data::*;
use super::dirty_clean;
use super::file_format;
use super::fs::*;
use super::work_product;
/// Saves and writes the [`DepGraph`] to the file system.
///
/// This function saves both the dep-graph and the query result cache,
/// and drops the result cache.
///
/// This function should only run after all queries have completed.
/// Trying to execute a query afterwards would attempt to read the result cache we just dropped.
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 let Some(_) = sess.has_errors_or_delayed_span_bugs() {
return;
}
let query_cache_path = query_cache_path(sess);
let dep_graph_path = dep_graph_path(sess);
let staging_dep_graph_path = staging_dep_graph_path(sess);
sess.time("assert_dep_graph", || crate::assert_dep_graph(tcx));
sess.time("check_dirty_clean", || dirty_clean::check_dirty_clean_annotations(tcx));
if sess.opts.unstable_opts.incremental_info {
tcx.dep_graph.print_incremental_info()
}
join(
move || {
sess.time("incr_comp_persist_result_cache", || {
// Drop the memory map so that we can remove the file and write to it.
if let Some(odc) = &tcx.on_disk_cache {
odc.drop_serialized_data(tcx);
}
file_format::save_in(sess, query_cache_path, "query cache", |e| {
encode_query_cache(tcx, e)
});
});
},
move || {
sess.time("incr_comp_persist_dep_graph", || {
if let Err(err) = tcx.dep_graph.encode(&tcx.sess.prof) {
sess.err(&format!(
"failed to write dependency graph to `{}`: {}",
staging_dep_graph_path.display(),
err
));
}
if let Err(err) = fs::rename(&staging_dep_graph_path, &dep_graph_path) {
sess.err(&format!(
"failed to move dependency graph from `{}` to `{}`: {}",
staging_dep_graph_path.display(),
dep_graph_path.display(),
err
));
}
});
},
);
})
}
/// Saves the work product index.
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 let Some(_) = sess.has_errors_or_delayed_span_bugs() {
return;
}
debug!("save_work_product_index()");
dep_graph.assert_ignored();
let path = work_products_path(sess);
file_format::save_in(sess, path, "work product index", |mut e| {
encode_work_product_index(&new_work_products, &mut e);
e.finish()
});
// 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_files.iter().all(|(_, path)| in_incr_comp_dir_sess(sess, path).exists())
);
}
}
// Check that we did not delete one of the current work-products:
debug_assert!({
new_work_products.iter().all(|(_, wp)| {
wp.saved_files.iter().all(|(_, path)| in_incr_comp_dir_sess(sess, path).exists())
})
});
}
fn encode_work_product_index(
work_products: &FxHashMap<WorkProductId, WorkProduct>,
encoder: &mut FileEncoder,
) {
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: FileEncoder) -> FileEncodeResult {
tcx.sess.time("incr_comp_serialize_result_cache", || tcx.serialize_query_result_cache(encoder))
}
/// Builds the dependency graph.
///
/// This function creates the *staging dep-graph*. When the dep-graph is modified by a query
/// execution, the new dependency information is not kept in memory but directly
/// output to this file. `save_dep_graph` then finalizes the staging dep-graph
/// and moves it to the permanent dep-graph path
pub fn build_dep_graph(
sess: &Session,
prev_graph: SerializedDepGraph,
prev_work_products: FxHashMap<WorkProductId, WorkProduct>,
) -> Option<DepGraph> {
if sess.opts.incremental.is_none() {
// No incremental compilation.
return None;
}
// Stream the dep-graph to an alternate file, to avoid overwriting anything in case of errors.
let path_buf = staging_dep_graph_path(sess);
let mut encoder = match FileEncoder::new(&path_buf) {
Ok(encoder) => encoder,
Err(err) => {
sess.err(&format!(
"failed to create dependency graph at `{}`: {}",
path_buf.display(),
err
));
return None;
}
};
file_format::write_file_header(&mut encoder, sess.is_nightly_build());
// First encode the commandline arguments hash
sess.opts.dep_tracking_hash(false).encode(&mut encoder);
Some(DepGraph::new(
&sess.prof,
prev_graph,
prev_work_products,
encoder,
sess.opts.unstable_opts.query_dep_graph,
sess.opts.unstable_opts.incremental_info,
))
}
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