Rollup merge of rust-lang#116534 - cjgillot:no-dep-tasks, r=davidtwco

Remove -Zdep-tasks.

This option is not useful any more, we can use `tracing` and `RUSTC_LOG` to debug the dep-graph.

compiler/rustc_interface/src/tests.rs

@@ -684,7 +684,6 @@ fn test_unstable_options_tracking_hash() {
     // tidy-alphabetical-start
     untracked!(assert_incr_state, Some(String::from("loaded")));
     untracked!(deduplicate_diagnostics, false);
-    untracked!(dep_tasks, true);
     untracked!(dont_buffer_diagnostics, true);
     untracked!(dump_dep_graph, true);
     untracked!(dump_mir, Some(String::from("abc")));

compiler/rustc_query_impl/src/plumbing.rs

@@ -440,8 +440,6 @@ where
     );
 
     if let Some(key) = Q::Key::recover(tcx, &dep_node) {
-        #[cfg(debug_assertions)]
-        let _guard = tracing::span!(tracing::Level::TRACE, stringify!($name), ?key).entered();
         force_query(query, QueryCtxt::new(tcx), key, dep_node);
         true
     } else {

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -149,7 +149,6 @@ impl<D: Deps> DepGraph<D> {
             DepNode { kind: D::DEP_KIND_RED, hash: Fingerprint::ZERO.into() },
             EdgesVec::new(),
             None,
-            false,
         );
         assert_eq!(red_node_index, DepNodeIndex::FOREVER_RED_NODE);
         match red_node_prev_index_and_color {
@@ -373,16 +372,13 @@ impl<D: Deps> DepGraphData<D> {
         let current_fingerprint =
             hash_result.map(|f| dcx.with_stable_hashing_context(|mut hcx| f(&mut hcx, &result)));
 
-        let print_status = cfg!(debug_assertions) && dcx.sess().opts.unstable_opts.dep_tasks;
-
         // Intern the new `DepNode`.
         let (dep_node_index, prev_and_color) = self.current.intern_node(
             dcx.profiler(),
             &self.previous,
             key,
             edges,
             current_fingerprint,
-            print_status,
         );
 
         hashing_timer.finish_with_query_invocation_id(dep_node_index.into());
@@ -589,16 +585,13 @@ impl<D: Deps> DepGraph<D> {
                 cx.with_stable_hashing_context(|mut hcx| hash_result(&mut hcx, result))
             });
 
-            let print_status = cfg!(debug_assertions) && cx.sess().opts.unstable_opts.dep_tasks;
-
             // Intern the new `DepNode` with the dependencies up-to-now.
             let (dep_node_index, prev_and_color) = data.current.intern_node(
                 cx.profiler(),
                 &data.previous,
                 node,
                 edges,
                 current_fingerprint,
-                print_status,
             );
 
             hashing_timer.finish_with_query_invocation_id(dep_node_index.into());
@@ -1219,20 +1212,13 @@ impl<D: Deps> CurrentDepGraph<D> {
         key: DepNode,
         edges: EdgesVec,
         fingerprint: Option<Fingerprint>,
-        print_status: bool,
     ) -> (DepNodeIndex, Option<(SerializedDepNodeIndex, DepNodeColor)>) {
-        let print_status = cfg!(debug_assertions) && print_status;
-
         // Get timer for profiling `DepNode` interning
         let _node_intern_timer =
             self.node_intern_event_id.map(|eid| profiler.generic_activity_with_event_id(eid));
 
         if let Some(prev_index) = prev_graph.node_to_index_opt(&key) {
-            let get_dep_node_index = |color, fingerprint| {
-                if print_status {
-                    eprintln!("[task::{color:}] {key:?}");
-                }
-
+            let get_dep_node_index = |fingerprint| {
                 let mut prev_index_to_index = self.prev_index_to_index.lock();
 
                 let dep_node_index = match prev_index_to_index[prev_index] {
@@ -1256,27 +1242,23 @@ impl<D: Deps> CurrentDepGraph<D> {
                 if fingerprint == prev_graph.fingerprint_by_index(prev_index) {
                     // This is a green node: it existed in the previous compilation,
                     // its query was re-executed, and it has the same result as before.
-                    let dep_node_index = get_dep_node_index("green", fingerprint);
+                    let dep_node_index = get_dep_node_index(fingerprint);
                     (dep_node_index, Some((prev_index, DepNodeColor::Green(dep_node_index))))
                 } else {
                     // This is a red node: it existed in the previous compilation, its query
                     // was re-executed, but it has a different result from before.
-                    let dep_node_index = get_dep_node_index("red", fingerprint);
+                    let dep_node_index = get_dep_node_index(fingerprint);
                     (dep_node_index, Some((prev_index, DepNodeColor::Red)))
                 }
             } else {
                 // This is a red node, effectively: it existed in the previous compilation
                 // session, its query was re-executed, but it doesn't compute a result hash
                 // (i.e. it represents a `no_hash` query), so we have no way of determining
                 // whether or not the result was the same as before.
-                let dep_node_index = get_dep_node_index("unknown", Fingerprint::ZERO);
+                let dep_node_index = get_dep_node_index(Fingerprint::ZERO);
                 (dep_node_index, Some((prev_index, DepNodeColor::Red)))
             }
         } else {
-            if print_status {
-                eprintln!("[task::new] {key:?}");
-            }
-
             let fingerprint = fingerprint.unwrap_or(Fingerprint::ZERO);
 
             // This is a new node: it didn't exist in the previous compilation session.

compiler/rustc_session/src/options.rs

@@ -1492,9 +1492,6 @@ options! {
     dep_info_omit_d_target: bool = (false, parse_bool, [TRACKED],
         "in dep-info output, omit targets for tracking dependencies of the dep-info files \
         themselves (default: no)"),
-    dep_tasks: bool = (false, parse_bool, [UNTRACKED],
-        "print tasks that execute and the color their dep node gets (requires debug build) \
-        (default: no)"),
     dont_buffer_diagnostics: bool = (false, parse_bool, [UNTRACKED],
         "emit diagnostics rather than buffering (breaks NLL error downgrading, sorting) \
         (default: no)"),