Wrap the self-profiler in an `Arc<Mutex<>>`

This will allow us to send it across threads and measure things like
LLVM time.

Cargo.lock

@@ -2625,6 +2625,7 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc 0.0.0",
  "rustc-demangle 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_allocator 0.0.0",

src/librustc/session/mod.rs

@@ -44,7 +44,9 @@ use std::fmt;
 use std::io::Write;
 use std::path::PathBuf;
 use std::time::Duration;
-use std::sync::mpsc;
+use std::sync::{Arc, mpsc};
+
+use parking_lot::Mutex as PlMutex;
 
 mod code_stats;
 pub mod config;
@@ -127,11 +129,8 @@ pub struct Session {
     /// Used by `-Z profile-queries` in `util::common`.
     pub profile_channel: Lock<Option<mpsc::Sender<ProfileQueriesMsg>>>,
 
-    /// Used by `-Z self-profile`.
-    pub self_profiling_active: bool,
-
-    /// Used by `-Z self-profile`.
-    pub self_profiling: Lock<SelfProfiler>,
+    /// Used by -Z self-profile
+    pub self_profiling: Option<Arc<PlMutex<SelfProfiler>>>,
 
     /// Some measurements that are being gathered during compilation.
     pub perf_stats: PerfStats,
@@ -834,27 +833,23 @@ impl Session {
     #[inline(never)]
     #[cold]
     fn profiler_active<F: FnOnce(&mut SelfProfiler) -> ()>(&self, f: F) {
-        let mut profiler = self.self_profiling.borrow_mut();
-        f(&mut profiler);
+        match &self.self_profiling {
+            None => bug!("profiler_active() called but there was no profiler active"),
+            Some(profiler) => {
+                let mut p = profiler.lock();
+
+                f(&mut p);
+            }
+        }
     }
 
     #[inline(always)]
     pub fn profiler<F: FnOnce(&mut SelfProfiler) -> ()>(&self, f: F) {
-        if unlikely!(self.self_profiling_active) {
+        if unlikely!(self.self_profiling.is_some()) {
             self.profiler_active(f)
         }
     }
 
-    pub fn print_profiler_results(&self) {
-        let mut profiler = self.self_profiling.borrow_mut();
-        profiler.print_results(&self.opts);
-    }
-
-    pub fn save_json_results(&self) {
-        let profiler = self.self_profiling.borrow();
-        profiler.save_results(&self.opts);
-    }
-
     pub fn print_perf_stats(&self) {
         println!(
             "Total time spent computing symbol hashes:      {}",
@@ -1136,6 +1131,13 @@ pub fn build_session_(
     source_map: Lrc<source_map::SourceMap>,
     driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
 ) -> Session {
+    let self_profiling_active = sopts.debugging_opts.self_profile ||
+                                sopts.debugging_opts.profile_json;
+
+    let self_profiler =
+        if self_profiling_active { Some(Arc::new(PlMutex::new(SelfProfiler::new()))) }
+        else { None };
+
     let host_triple = TargetTriple::from_triple(config::host_triple());
     let host = Target::search(&host_triple).unwrap_or_else(|e|
         span_diagnostic
@@ -1185,9 +1187,6 @@ pub fn build_session_(
         CguReuseTracker::new_disabled()
     };
 
-    let self_profiling_active = sopts.debugging_opts.self_profile ||
-                                sopts.debugging_opts.profile_json;
-
     let sess = Session {
         target: target_cfg,
         host,
@@ -1216,8 +1215,7 @@ pub fn build_session_(
         imported_macro_spans: OneThread::new(RefCell::new(FxHashMap::default())),
         incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
         cgu_reuse_tracker,
-        self_profiling_active,
-        self_profiling: Lock::new(SelfProfiler::new()),
+        self_profiling: self_profiler,
         profile_channel: Lock::new(None),
         perf_stats: PerfStats {
             symbol_hash_time: Lock::new(Duration::from_secs(0)),

src/librustc_codegen_ssa/Cargo.toml

@@ -19,6 +19,7 @@ memmap = "0.6"
 log = "0.4.5"
 libc = "0.2.44"
 jobserver = "0.1.11"
+parking_lot = "0.7"
 
 serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }

src/librustc_codegen_ssa/back/write.rs

@@ -19,6 +19,7 @@ use rustc::util::time_graph::{self, TimeGraph, Timeline};
 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc::ty::TyCtxt;
 use rustc::util::common::{time_depth, set_time_depth, print_time_passes_entry};
+use rustc::util::profiling::SelfProfiler;
 use rustc_fs_util::link_or_copy;
 use rustc_data_structures::svh::Svh;
 use rustc_errors::{Handler, Level, DiagnosticBuilder, FatalError, DiagnosticId};
@@ -29,6 +30,7 @@ use syntax::ext::hygiene::Mark;
 use syntax_pos::MultiSpan;
 use syntax_pos::symbol::Symbol;
 use jobserver::{Client, Acquired};
+use parking_lot::Mutex as PlMutex;
 
 use std::any::Any;
 use std::fs;
@@ -201,6 +203,7 @@ pub struct CodegenContext<B: WriteBackendMethods> {
     // Resources needed when running LTO
     pub backend: B,
     pub time_passes: bool,
+    pub profiler: Option<Arc<PlMutex<SelfProfiler>>>,
     pub lto: Lto,
     pub no_landing_pads: bool,
     pub save_temps: bool,
@@ -254,6 +257,26 @@ impl<B: WriteBackendMethods> CodegenContext<B> {
             ModuleKind::Allocator => &self.allocator_module_config,
         }
     }
+
+    #[inline(never)]
+    #[cold]
+    fn profiler_active<F: FnOnce(&mut SelfProfiler) -> ()>(&self, f: F) {
+        match &self.profiler {
+            None => bug!("profiler_active() called but there was no profiler active"),
+            Some(profiler) => {
+                let mut p = profiler.lock();
+
+                f(&mut p);
+            }
+        }
+    }
+
+    #[inline(always)]
+    pub fn profile<F: FnOnce(&mut SelfProfiler) -> ()>(&self, f: F) {
+        if unlikely!(self.profiler.is_some()) {
+            self.profiler_active(f)
+        }
+    }
 }
 
 fn generate_lto_work<B: ExtraBackendMethods>(
@@ -1033,6 +1056,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         save_temps: sess.opts.cg.save_temps,
         opts: Arc::new(sess.opts.clone()),
         time_passes: sess.time_passes(),
+        profiler: sess.self_profiling.clone(),
         exported_symbols,
         plugin_passes: sess.plugin_llvm_passes.borrow().clone(),
         remark: sess.opts.cg.remark.clone(),

src/librustc_codegen_ssa/lib.rs

@@ -2,9 +2,11 @@
 
 #![feature(box_patterns)]
 #![feature(box_syntax)]
+#![feature(core_intrinsics)]
 #![feature(custom_attribute)]
 #![feature(libc)]
 #![feature(rustc_diagnostic_macros)]
+#![feature(stmt_expr_attributes)]
 #![feature(in_band_lifetimes)]
 #![feature(nll)]
 #![allow(unused_attributes)]
@@ -20,6 +22,7 @@
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate rustc;
+#[macro_use] extern crate rustc_data_structures;
 #[macro_use] extern crate syntax;
 
 use std::path::PathBuf;

src/librustc_driver/driver.rs

@@ -349,14 +349,6 @@ pub fn compile_input(
         sess.print_perf_stats();
     }
 
-    if sess.opts.debugging_opts.self_profile {
-        sess.print_profiler_results();
-    }
-
-    if sess.opts.debugging_opts.profile_json {
-        sess.save_json_results();
-    }
-
     controller_entry_point!(
         compilation_done,
         sess,

src/librustc_driver/lib.rs

@@ -276,6 +276,15 @@ fn run_compiler_with_pool<'a>(
                               &control)
     };
 
+
+    if sess.opts.debugging_opts.self_profile {
+        sess.profiler(|p| p.print_results(&sess.opts));
+    }
+
+    if sess.opts.debugging_opts.profile_json {
+        sess.profiler(|p| p.save_results(&sess.opts));
+    }
+
     (result, Some(sess))
 }