Rollup of 5 pull requests

src/librustc/dep_graph/graph.rs

@@ -9,7 +9,6 @@ use std::hash::Hash;
 use std::collections::hash_map::Entry;
 use std::mem;
 use crate::ty::{self, TyCtxt};
-use crate::util::common::{ProfileQueriesMsg, profq_msg};
 use parking_lot::{Mutex, Condvar};
 
 use crate::ich::{StableHashingContext, StableHashingContextProvider, Fingerprint};
@@ -75,9 +74,6 @@ struct DepGraphData {
     previous_work_products: FxHashMap<WorkProductId, WorkProduct>,
 
     dep_node_debug: Lock<FxHashMap<DepNode, String>>,
-
-    // Used for testing, only populated when -Zquery-dep-graph is specified.
-    loaded_from_cache: Lock<FxHashMap<DepNodeIndex, bool>>,
 }
 
 pub fn hash_result<R>(hcx: &mut StableHashingContext<'_>, result: &R) -> Option<Fingerprint>
@@ -104,7 +100,6 @@ impl DepGraph {
                 emitting_diagnostics_cond_var: Condvar::new(),
                 previous: prev_graph,
                 colors: DepNodeColorMap::new(prev_graph_node_count),
-                loaded_from_cache: Default::default(),
             })),
         }
     }
@@ -260,10 +255,6 @@ impl DepGraph {
             //  - we can get an idea of the runtime cost.
             let mut hcx = cx.get_stable_hashing_context();
 
-            if cfg!(debug_assertions) {
-                profq_msg(hcx.sess(), ProfileQueriesMsg::TaskBegin(key.clone()))
-            };
-
             let result = if no_tcx {
                 task(cx, arg)
             } else {
@@ -279,10 +270,6 @@ impl DepGraph {
                 })
             };
 
-            if cfg!(debug_assertions) {
-                profq_msg(hcx.sess(), ProfileQueriesMsg::TaskEnd)
-            };
-
             let current_fingerprint = hash_result(&mut hcx, &result);
 
             let dep_node_index = finish_task_and_alloc_depnode(
@@ -874,25 +861,6 @@ impl DepGraph {
             }
         }
     }
-
-    pub fn mark_loaded_from_cache(&self, dep_node_index: DepNodeIndex, state: bool) {
-        debug!("mark_loaded_from_cache({:?}, {})",
-               self.data.as_ref().unwrap().current.borrow().data[dep_node_index].node,
-               state);
-
-        self.data
-            .as_ref()
-            .unwrap()
-            .loaded_from_cache
-            .borrow_mut()
-            .insert(dep_node_index, state);
-    }
-
-    pub fn was_loaded_from_cache(&self, dep_node: &DepNode) -> Option<bool> {
-        let data = self.data.as_ref().unwrap();
-        let dep_node_index = data.current.borrow().node_to_node_index[dep_node];
-        data.loaded_from_cache.borrow().get(&dep_node_index).cloned()
-    }
 }
 
 /// A "work product" is an intermediate result that we save into the

src/librustc/error_codes.rs

@@ -1520,6 +1520,47 @@ where
 ```
 "##,
 
+E0495: r##"
+A lifetime cannot be determined in the given situation.
+
+Erroneous code example:
+
+```compile_fail,E0495
+fn transmute_lifetime<'a, 'b, T>(t: &'a (T,)) -> &'b T {
+    match (&t,) { // error!
+        ((u,),) => u,
+    }
+}
+
+let y = Box::new((42,));
+let x = transmute_lifetime(&y);
+```
+
+In this code, you have two ways to solve this issue:
+ 1. Enforce that `'a` lives at least as long as `'b`.
+ 2. Use the same lifetime requirement for both input and output values.
+
+So for the first solution, you can do it by replacing `'a` with `'a: 'b`:
+
+```
+fn transmute_lifetime<'a: 'b, 'b, T>(t: &'a (T,)) -> &'b T {
+    match (&t,) { // ok!
+        ((u,),) => u,
+    }
+}
+```
+
+In the second you can do it by simply removing `'b` so they both use `'a`:
+
+```
+fn transmute_lifetime<'a, T>(t: &'a (T,)) -> &'a T {
+    match (&t,) { // ok!
+        ((u,),) => u,
+    }
+}
+```
+"##,
+
 E0496: r##"
 A lifetime name is shadowing another lifetime name. Erroneous code example:
 
@@ -2116,8 +2157,6 @@ rejected in your own crates.
     E0488, // lifetime of variable does not enclose its declaration
     E0489, // type/lifetime parameter not in scope here
     E0490, // a value of type `..` is borrowed for too long
-    E0495, // cannot infer an appropriate lifetime due to conflicting
-           // requirements
     E0623, // lifetime mismatch where both parameters are anonymous regions
     E0628, // generators cannot have explicit parameters
     E0631, // type mismatch in closure arguments

src/librustc/ich/impls_syntax.rs

@@ -424,6 +424,7 @@ impl<'a> HashStable<StableHashingContext<'a>> for SourceFile {
             ref lines,
             ref multibyte_chars,
             ref non_narrow_chars,
+            ref normalized_pos,
         } = *self;
 
         (name_hash as u64).hash_stable(hcx, hasher);
@@ -452,6 +453,12 @@ impl<'a> HashStable<StableHashingContext<'a>> for SourceFile {
         for &char_pos in non_narrow_chars.iter() {
             stable_non_narrow_char(char_pos, start_pos).hash_stable(hcx, hasher);
         }
+
+        normalized_pos.len().hash_stable(hcx, hasher);
+        for &char_pos in normalized_pos.iter() {
+            stable_normalized_pos(char_pos, start_pos).hash_stable(hcx, hasher);
+        }
+
     }
 }
 
@@ -481,6 +488,18 @@ fn stable_non_narrow_char(swc: ::syntax_pos::NonNarrowChar,
     (pos.0 - source_file_start.0, width as u32)
 }
 
+fn stable_normalized_pos(np: ::syntax_pos::NormalizedPos,
+                         source_file_start: ::syntax_pos::BytePos)
+                         -> (u32, u32) {
+    let ::syntax_pos::NormalizedPos {
+        pos,
+        diff
+    } = np;
+
+    (pos.0 - source_file_start.0, diff)
+}
+
+
 impl<'tcx> HashStable<StableHashingContext<'tcx>> for feature_gate::Features {
     fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {
         // Unfortunately we cannot exhaustively list fields here, since the

src/librustc/session/config.rs

@@ -1316,10 +1316,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv)"),
     query_dep_graph: bool = (false, parse_bool, [UNTRACKED],
         "enable queries of the dependency graph for regression testing"),
-    profile_queries: bool = (false, parse_bool, [UNTRACKED],
-        "trace and profile the queries of the incremental compilation framework"),
-    profile_queries_and_keys: bool = (false, parse_bool, [UNTRACKED],
-        "trace and profile the queries and keys of the incremental compilation framework"),
     no_analysis: bool = (false, parse_bool, [UNTRACKED],
         "parse and expand the source, but run no analysis"),
     extra_plugins: Vec<String> = (Vec::new(), parse_list, [TRACKED],

src/librustc/session/mod.rs

@@ -11,7 +11,6 @@ use crate::session::config::{OutputType, PrintRequest, SwitchWithOptPath};
 use crate::session::search_paths::{PathKind, SearchPath};
 use crate::util::nodemap::{FxHashMap, FxHashSet};
 use crate::util::common::{duration_to_secs_str, ErrorReported};
-use crate::util::common::ProfileQueriesMsg;
 
 use rustc_data_structures::base_n;
 use rustc_data_structures::sync::{
@@ -46,7 +45,7 @@ use std::fmt;
 use std::io::Write;
 use std::path::PathBuf;
 use std::time::Duration;
-use std::sync::{Arc, mpsc};
+use std::sync::Arc;
 
 mod code_stats;
 pub mod config;
@@ -125,9 +124,6 @@ pub struct Session {
     /// `-Zquery-dep-graph` is specified.
     pub cgu_reuse_tracker: CguReuseTracker,
 
-    /// Used by `-Z profile-queries` in `util::common`.
-    pub profile_channel: Lock<Option<mpsc::Sender<ProfileQueriesMsg>>>,
-
     /// Used by `-Z self-profile`.
     pub prof: SelfProfilerRef,
 
@@ -509,13 +505,6 @@ impl Session {
     pub fn time_extended(&self) -> bool {
         self.opts.debugging_opts.time_passes
     }
-    pub fn profile_queries(&self) -> bool {
-        self.opts.debugging_opts.profile_queries
-            || self.opts.debugging_opts.profile_queries_and_keys
-    }
-    pub fn profile_queries_and_keys(&self) -> bool {
-        self.opts.debugging_opts.profile_queries_and_keys
-    }
     pub fn instrument_mcount(&self) -> bool {
         self.opts.debugging_opts.instrument_mcount
     }
@@ -1234,7 +1223,6 @@ fn build_session_(
         incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
         cgu_reuse_tracker,
         prof: SelfProfilerRef::new(self_profiler),
-        profile_channel: Lock::new(None),
         perf_stats: PerfStats {
             symbol_hash_time: Lock::new(Duration::from_secs(0)),
             decode_def_path_tables_time: Lock::new(Duration::from_secs(0)),

src/librustc/ty/query/on_disk_cache.rs

@@ -1075,7 +1075,7 @@ where
     let desc = &format!("encode_query_results for {}",
         ::std::any::type_name::<Q>());
 
-    time_ext(tcx.sess.time_extended(), Some(tcx.sess), desc, || {
+    time_ext(tcx.sess.time_extended(), desc, || {
         let shards = Q::query_cache(tcx).lock_shards();
         assert!(shards.iter().all(|shard| shard.active.is_empty()));
         for (key, entry) in shards.iter().flat_map(|shard| shard.results.iter()) {

src/librustc/ty/query/plumbing.rs

@@ -9,8 +9,6 @@ use crate::ty::query::Query;
 use crate::ty::query::config::{QueryConfig, QueryDescription};
 use crate::ty::query::job::{QueryJob, QueryResult, QueryInfo};
 
-use crate::util::common::{profq_msg, ProfileQueriesMsg, QueryMsg};
-
 use errors::DiagnosticBuilder;
 use errors::Level;
 use errors::Diagnostic;
@@ -62,33 +60,6 @@ impl<'tcx, M: QueryConfig<'tcx>> Default for QueryCache<'tcx, M> {
     }
 }
 
-// If enabled, sends a message to the profile-queries thread.
-macro_rules! profq_msg {
-    ($tcx:expr, $msg:expr) => {
-        if cfg!(debug_assertions) {
-            if $tcx.sess.profile_queries() {
-                profq_msg($tcx.sess, $msg)
-            }
-        }
-    }
-}
-
-// If enabled, formats a key using its debug string, which can be
-// expensive to compute (in terms of time).
-macro_rules! profq_query_msg {
-    ($query:expr, $tcx:expr, $key:expr) => {{
-        let msg = if cfg!(debug_assertions) {
-            if $tcx.sess.profile_queries_and_keys() {
-                Some(format!("{:?}", $key))
-            } else { None }
-        } else { None };
-        QueryMsg {
-            query: $query,
-            msg,
-        }
-    }}
-}
-
 /// A type representing the responsibility to execute the job in the `job` field.
 /// This will poison the relevant query if dropped.
 pub(super) struct JobOwner<'a, 'tcx, Q: QueryDescription<'tcx>> {
@@ -111,7 +82,6 @@ impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
         loop {
             let mut lock = cache.get_shard_by_value(key).lock();
             if let Some(value) = lock.results.get(key) {
-                profq_msg!(tcx, ProfileQueriesMsg::CacheHit);
                 tcx.prof.query_cache_hit(Q::NAME);
                 let result = (value.value.clone(), value.index);
                 #[cfg(debug_assertions)]
@@ -358,13 +328,6 @@ impl<'tcx> TyCtxt<'tcx> {
                key,
                span);
 
-        profq_msg!(self,
-            ProfileQueriesMsg::QueryBegin(
-                span.data(),
-                profq_query_msg!(Q::NAME.as_str(), self, key),
-            )
-        );
-
         let job = match JobOwner::try_get(self, span, &key) {
             TryGetJob::NotYetStarted(job) => job,
             TryGetJob::Cycle(result) => return result,
@@ -383,7 +346,6 @@ impl<'tcx> TyCtxt<'tcx> {
 
         if Q::ANON {
 
-            profq_msg!(self, ProfileQueriesMsg::ProviderBegin);
             let prof_timer = self.prof.query_provider(Q::NAME);
 
             let ((result, dep_node_index), diagnostics) = with_diagnostics(|diagnostics| {
@@ -395,7 +357,6 @@ impl<'tcx> TyCtxt<'tcx> {
             });
 
             drop(prof_timer);
-            profq_msg!(self, ProfileQueriesMsg::ProviderEnd);
 
             self.dep_graph.read_index(dep_node_index);
 
@@ -468,7 +429,6 @@ impl<'tcx> TyCtxt<'tcx> {
         };
 
         let result = if let Some(result) = result {
-            profq_msg!(self, ProfileQueriesMsg::CacheHit);
             result
         } else {
             // We could not load a result from the on-disk cache, so
@@ -489,10 +449,6 @@ impl<'tcx> TyCtxt<'tcx> {
             self.incremental_verify_ich::<Q>(&result, dep_node, dep_node_index);
         }
 
-        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
-            self.dep_graph.mark_loaded_from_cache(dep_node_index, true);
-        }
-
         result
     }
 
@@ -546,7 +502,6 @@ impl<'tcx> TyCtxt<'tcx> {
                  - dep-node: {:?}",
                 key, dep_node);
 
-        profq_msg!(self, ProfileQueriesMsg::ProviderBegin);
         let prof_timer = self.prof.query_provider(Q::NAME);
 
         let ((result, dep_node_index), diagnostics) = with_diagnostics(|diagnostics| {
@@ -568,11 +523,6 @@ impl<'tcx> TyCtxt<'tcx> {
         });
 
         drop(prof_timer);
-        profq_msg!(self, ProfileQueriesMsg::ProviderEnd);
-
-        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
-            self.dep_graph.mark_loaded_from_cache(dep_node_index, false);
-        }
 
         if unlikely!(!diagnostics.is_empty()) {
             if dep_node.kind != crate::dep_graph::DepKind::Null {
@@ -614,19 +564,12 @@ impl<'tcx> TyCtxt<'tcx> {
 
             let _ = self.get_query::<Q>(DUMMY_SP, key);
         } else {
-            profq_msg!(self, ProfileQueriesMsg::CacheHit);
             self.prof.query_cache_hit(Q::NAME);
         }
     }
 
     #[allow(dead_code)]
     fn force_query<Q: QueryDescription<'tcx>>(self, key: Q::Key, span: Span, dep_node: DepNode) {
-        profq_msg!(
-            self,
-            ProfileQueriesMsg::QueryBegin(span.data(),
-                                          profq_query_msg!(Q::NAME.as_str(), self, key))
-        );
-
         // We may be concurrently trying both execute and force a query.
         // Ensure that only one of them runs the query.
         let job = match JobOwner::try_get(self, span, &key) {