Rollup merge of #102725 - nnethercote:rm-Z-time, r=davidtwco

Remove `-Ztime`

Because it has a lot of overlap with `-Ztime-passes` but is generally less useful. Plus some related cleanups.

Best reviewed one commit at a time.

r? `@davidtwco`

14 files changed, 56 insertions, 74 deletions

diff --git a/compiler/rustc_codegen_llvm/src/back/lto.rs b/compiler/rustc_codegen_llvm/src/back/lto.rs
index 2049422b79a..cef7bf1e803 100644
--- a/compiler/rustc_codegen_llvm/src/back/lto.rs
+++ b/compiler/rustc_codegen_llvm/src/back/lto.rs
@@ -573,7 +573,7 @@ pub(crate) fn run_pass_manager(
     module: &mut ModuleCodegen<ModuleLlvm>,
     thin: bool,
 ) -> Result<(), FatalError> {
-    let _timer = cgcx.prof.extra_verbose_generic_activity("LLVM_lto_optimize", &*module.name);
+    let _timer = cgcx.prof.verbose_generic_activity_with_arg("LLVM_lto_optimize", &*module.name);
     let config = cgcx.config(module.kind);
 
     // Now we have one massive module inside of llmod. Time to run the
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index 680b9b642d9..6188094bbbd 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -1637,7 +1637,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         llvm_start_time: &mut Option<VerboseTimingGuard<'a>>,
     ) {
         if config.time_module && llvm_start_time.is_none() {
-            *llvm_start_time = Some(prof.extra_verbose_generic_activity("LLVM_passes", "crate"));
+            *llvm_start_time = Some(prof.verbose_generic_activity("LLVM_passes"));
         }
     }
 }
diff --git a/compiler/rustc_data_structures/src/profiling.rs b/compiler/rustc_data_structures/src/profiling.rs
index d8b26f9840b..ba1960805d8 100644
--- a/compiler/rustc_data_structures/src/profiling.rs
+++ b/compiler/rustc_data_structures/src/profiling.rs
@@ -158,30 +158,21 @@ pub struct SelfProfilerRef {
     // actually enabled.
     event_filter_mask: EventFilter,
 
-    // Print verbose generic activities to stdout
+    // Print verbose generic activities to stderr?
     print_verbose_generic_activities: bool,
-
-    // Print extra verbose generic activities to stdout
-    print_extra_verbose_generic_activities: bool,
 }
 
 impl SelfProfilerRef {
     pub fn new(
         profiler: Option<Arc<SelfProfiler>>,
         print_verbose_generic_activities: bool,
-        print_extra_verbose_generic_activities: bool,
     ) -> SelfProfilerRef {
         // If there is no SelfProfiler then the filter mask is set to NONE,
         // ensuring that nothing ever tries to actually access it.
         let event_filter_mask =
             profiler.as_ref().map_or(EventFilter::empty(), |p| p.event_filter_mask);
 
-        SelfProfilerRef {
-            profiler,
-            event_filter_mask,
-            print_verbose_generic_activities,
-            print_extra_verbose_generic_activities,
-        }
+        SelfProfilerRef { profiler, event_filter_mask, print_verbose_generic_activities }
     }
 
     /// This shim makes sure that calls only get executed if the filter mask
@@ -214,7 +205,7 @@ impl SelfProfilerRef {
     /// Start profiling a verbose generic activity. Profiling continues until the
     /// VerboseTimingGuard returned from this call is dropped. In addition to recording
     /// a measureme event, "verbose" generic activities also print a timing entry to
-    /// stdout if the compiler is invoked with -Ztime or -Ztime-passes.
+    /// stderr if the compiler is invoked with -Ztime-passes.
     pub fn verbose_generic_activity<'a>(
         &'a self,
         event_label: &'static str,
@@ -225,11 +216,8 @@ impl SelfProfilerRef {
         VerboseTimingGuard::start(message, self.generic_activity(event_label))
     }
 
-    /// Start profiling an extra verbose generic activity. Profiling continues until the
-    /// VerboseTimingGuard returned from this call is dropped. In addition to recording
-    /// a measureme event, "extra verbose" generic activities also print a timing entry to
-    /// stdout if the compiler is invoked with -Ztime-passes.
-    pub fn extra_verbose_generic_activity<'a, A>(
+    /// Like `verbose_generic_activity`, but with an extra arg.
+    pub fn verbose_generic_activity_with_arg<'a, A>(
         &'a self,
         event_label: &'static str,
         event_arg: A,
@@ -237,7 +225,7 @@ impl SelfProfilerRef {
     where
         A: Borrow<str> + Into<String>,
     {
-        let message = if self.print_extra_verbose_generic_activities {
+        let message = if self.print_verbose_generic_activities {
             Some(format!("{}({})", event_label, event_arg.borrow()))
         } else {
             None
@@ -745,27 +733,9 @@ impl Drop for VerboseTimingGuard<'_> {
         if let Some((start_time, start_rss, ref message)) = self.start_and_message {
             let end_rss = get_resident_set_size();
             let dur = start_time.elapsed();
-
-            if should_print_passes(dur, start_rss, end_rss) {
-                print_time_passes_entry(&message, dur, start_rss, end_rss);
-            }
-        }
-    }
-}
-
-fn should_print_passes(dur: Duration, start_rss: Option<usize>, end_rss: Option<usize>) -> bool {
-    if dur.as_millis() > 5 {
-        return true;
-    }
-
-    if let (Some(start_rss), Some(end_rss)) = (start_rss, end_rss) {
-        let change_rss = end_rss.abs_diff(start_rss);
-        if change_rss > 0 {
-            return true;
+            print_time_passes_entry(&message, dur, start_rss, end_rss);
         }
     }
-
-    false
 }
 
 pub fn print_time_passes_entry(
@@ -774,6 +744,26 @@ pub fn print_time_passes_entry(
     start_rss: Option<usize>,
     end_rss: Option<usize>,
 ) {
+    // Print the pass if its duration is greater than 5 ms, or it changed the
+    // measured RSS.
+    let is_notable = || {
+        if dur.as_millis() > 5 {
+            return true;
+        }
+
+        if let (Some(start_rss), Some(end_rss)) = (start_rss, end_rss) {
+            let change_rss = end_rss.abs_diff(start_rss);
+            if change_rss > 0 {
+                return true;
+            }
+        }
+
+        false
+    };
+    if !is_notable() {
+        return;
+    }
+
     let rss_to_mb = |rss| (rss as f64 / 1_000_000.0).round() as usize;
     let rss_change_to_mb = |rss| (rss as f64 / 1_000_000.0).round() as i128;
 
diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index fcd49f5d015..7d5604fcabc 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -127,10 +127,13 @@ pub struct TimePassesCallbacks {
 }
 
 impl Callbacks for TimePassesCallbacks {
+    // JUSTIFICATION: the session doesn't exist at this point.
+    #[allow(rustc::bad_opt_access)]
     fn config(&mut self, config: &mut interface::Config) {
-        // If a --prints=... option has been given, we don't print the "total"
-        // time because it will mess up the --prints output. See #64339.
-        self.time_passes = config.opts.prints.is_empty() && config.opts.time_passes();
+        // If a --print=... option has been given, we don't print the "total"
+        // time because it will mess up the --print output. See #64339.
+        //
+        self.time_passes = config.opts.prints.is_empty() && config.opts.unstable_opts.time_passes;
         config.opts.trimmed_def_paths = TrimmedDefPaths::GoodPath;
     }
 }
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index 2cd959689e6..98eeaad976f 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -692,7 +692,6 @@ fn test_unstable_options_tracking_hash() {
     untracked!(span_free_formats, true);
     untracked!(temps_dir, Some(String::from("abc")));
     untracked!(threads, 99);
-    untracked!(time, true);
     untracked!(time_llvm_passes, true);
     untracked!(time_passes, true);
     untracked!(trace_macros, true);
diff --git a/compiler/rustc_lint/src/early.rs b/compiler/rustc_lint/src/early.rs
index f7759bec908..aee870dd29d 100644
--- a/compiler/rustc_lint/src/early.rs
+++ b/compiler/rustc_lint/src/early.rs
@@ -409,7 +409,7 @@ pub fn check_ast_node<'a>(
     if sess.opts.unstable_opts.no_interleave_lints {
         for (i, pass) in passes.iter_mut().enumerate() {
             buffered =
-                sess.prof.extra_verbose_generic_activity("run_lint", pass.name()).run(|| {
+                sess.prof.verbose_generic_activity_with_arg("run_lint", pass.name()).run(|| {
                     early_lint_node(
                         sess,
                         !pre_expansion && i == 0,
diff --git a/compiler/rustc_lint/src/late.rs b/compiler/rustc_lint/src/late.rs
index da6f1c5eecc..d4e19ef6b22 100644
--- a/compiler/rustc_lint/src/late.rs
+++ b/compiler/rustc_lint/src/late.rs
@@ -425,20 +425,23 @@ fn late_lint_crate<'tcx, T: LateLintPass<'tcx>>(tcx: TyCtxt<'tcx>, builtin_lints
         late_lint_pass_crate(tcx, builtin_lints);
     } else {
         for pass in &mut passes {
-            tcx.sess.prof.extra_verbose_generic_activity("run_late_lint", pass.name()).run(|| {
-                late_lint_pass_crate(tcx, LateLintPassObjects { lints: slice::from_mut(pass) });
-            });
+            tcx.sess.prof.verbose_generic_activity_with_arg("run_late_lint", pass.name()).run(
+                || {
+                    late_lint_pass_crate(tcx, LateLintPassObjects { lints: slice::from_mut(pass) });
+                },
+            );
         }
 
         let mut passes: Vec<_> =
             unerased_lint_store(tcx).late_module_passes.iter().map(|pass| (pass)(tcx)).collect();
 
         for pass in &mut passes {
-            tcx.sess.prof.extra_verbose_generic_activity("run_late_module_lint", pass.name()).run(
-                || {
+            tcx.sess
+                .prof
+                .verbose_generic_activity_with_arg("run_late_module_lint", pass.name())
+                .run(|| {
                     late_lint_pass_crate(tcx, LateLintPassObjects { lints: slice::from_mut(pass) });
-                },
-            );
+                });
         }
     }
 }
diff --git a/compiler/rustc_query_impl/src/on_disk_cache.rs b/compiler/rustc_query_impl/src/on_disk_cache.rs
index 0e93f3ce1d6..e96ea682cae 100644
--- a/compiler/rustc_query_impl/src/on_disk_cache.rs
+++ b/compiler/rustc_query_impl/src/on_disk_cache.rs
@@ -1067,7 +1067,7 @@ pub fn encode_query_results<'a, 'tcx, CTX, Q>(
     let _timer = tcx
         .dep_context()
         .profiler()
-        .extra_verbose_generic_activity("encode_query_results_for", std::any::type_name::<Q>());
+        .verbose_generic_activity_with_arg("encode_query_results_for", std::any::type_name::<Q>());
 
     assert!(Q::query_state(tcx).all_inactive());
     let cache = Q::query_cache(tcx);
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 486c514a4f5..8d527c05122 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -280,14 +280,6 @@ macro_rules! options {
 
 ) }
 
-impl Options {
-    // JUSTIFICATION: defn of the suggested wrapper fn
-    #[allow(rustc::bad_opt_access)]
-    pub fn time_passes(&self) -> bool {
-        self.unstable_opts.time_passes || self.unstable_opts.time
-    }
-}
-
 impl CodegenOptions {
     // JUSTIFICATION: defn of the suggested wrapper fn
     #[allow(rustc::bad_opt_access)]
@@ -1596,9 +1588,6 @@ options! {
     #[rustc_lint_opt_deny_field_access("use `Session::threads` instead of this field")]
     threads: usize = (1, parse_threads, [UNTRACKED],
         "use a thread pool with N threads"),
-    #[rustc_lint_opt_deny_field_access("use `Session::time_passes` instead of this field")]
-    time: bool = (false, parse_bool, [UNTRACKED],
-        "measure time of rustc processes (default: no)"),
     #[rustc_lint_opt_deny_field_access("use `Session::time_llvm_passes` instead of this field")]
     time_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
         "measure time of each LLVM pass (default: no)"),
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 59b544ce9eb..5926cdc9dad 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -606,10 +606,6 @@ impl Session {
         self.parse_sess.source_map()
     }
 
-    pub fn time_passes(&self) -> bool {
-        self.opts.time_passes()
-    }
-
     /// Returns `true` if internal lints should be added to the lint store - i.e. if
     /// `-Zunstable-options` is provided and this isn't rustdoc (internal lints can trigger errors
     /// to be emitted under rustdoc).
@@ -927,6 +923,10 @@ impl Session {
         self.opts.unstable_opts.instrument_mcount
     }
 
+    pub fn time_passes(&self) -> bool {
+        self.opts.unstable_opts.time_passes
+    }
+
     pub fn time_llvm_passes(&self) -> bool {
         self.opts.unstable_opts.time_llvm_passes
     }
@@ -1403,8 +1403,7 @@ pub fn build_session(
         CguReuseTracker::new_disabled()
     };
 
-    let prof =
-        SelfProfilerRef::new(self_profiler, sopts.time_passes(), sopts.unstable_opts.time_passes);
+    let prof = SelfProfilerRef::new(self_profiler, sopts.unstable_opts.time_passes);
 
     let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") {
         Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate,
diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs
index e96f8b0d312..776d73b98c4 100644
--- a/src/bootstrap/bin/rustc.rs
+++ b/src/bootstrap/bin/rustc.rs
@@ -67,7 +67,7 @@ fn main() {
             if target == "all"
                 || target.into_string().unwrap().split(',').any(|c| c.trim() == crate_name)
             {
-                cmd.arg("-Ztime");
+                cmd.arg("-Ztime-passes");
             }
         }
     }
diff --git a/src/doc/rustc/src/command-line-arguments.md b/src/doc/rustc/src/command-line-arguments.md
index 79cdfb82e41..2d12cf382b1 100644
--- a/src/doc/rustc/src/command-line-arguments.md
+++ b/src/doc/rustc/src/command-line-arguments.md
@@ -300,7 +300,7 @@ _Note:_ The order of these lint level arguments is taken into account, see [lint
 ## `-Z`: set unstable options
 
 This flag will allow you to set unstable options of rustc. In order to set multiple options,
-the -Z flag can be used multiple times. For example: `rustc -Z verbose -Z time`.
+the -Z flag can be used multiple times. For example: `rustc -Z verbose -Z time-passes`.
 Specifying options with -Z is only available on nightly. To view all available options
 run: `rustc -Z help`.
 
diff --git a/src/librustdoc/formats/renderer.rs b/src/librustdoc/formats/renderer.rs
index 62ba984acc9..6f9cc026675 100644
--- a/src/librustdoc/formats/renderer.rs
+++ b/src/librustdoc/formats/renderer.rs
@@ -58,7 +58,7 @@ pub(crate) fn run_format<'tcx, T: FormatRenderer<'tcx>>(
 
     let emit_crate = options.should_emit_crate();
     let (mut format_renderer, krate) = prof
-        .extra_verbose_generic_activity("create_renderer", T::descr())
+        .verbose_generic_activity_with_arg("create_renderer", T::descr())
         .run(|| T::init(krate, options, cache, tcx))?;
 
     if !emit_crate {
@@ -92,6 +92,6 @@ pub(crate) fn run_format<'tcx, T: FormatRenderer<'tcx>>(
                 .run(|| cx.item(item))?;
         }
     }
-    prof.extra_verbose_generic_activity("renderer_after_krate", T::descr())
+    prof.verbose_generic_activity_with_arg("renderer_after_krate", T::descr())
         .run(|| format_renderer.after_krate())
 }
diff --git a/src/test/rustdoc-ui/z-help.stdout b/src/test/rustdoc-ui/z-help.stdout
index 25d5c6e4ad2..65536cb3aa1 100644
--- a/src/test/rustdoc-ui/z-help.stdout
+++ b/src/test/rustdoc-ui/z-help.stdout
@@ -170,7 +170,6 @@
     -Z                                 thinlto=val -- enable ThinLTO when possible
     -Z                           thir-unsafeck=val -- use the THIR unsafety checker (default: no)
     -Z                                 threads=val -- use a thread pool with N threads
-    -Z                                    time=val -- measure time of rustc processes (default: no)
     -Z                        time-llvm-passes=val -- measure time of each LLVM pass (default: no)
     -Z                             time-passes=val -- measure time of each rustc pass (default: no)
     -Z                               tls-model=val -- choose the TLS model to use (`rustc --print tls-models` for details)