WIP: Parallelize passes using rayon

src/Cargo.lock

@@ -375,6 +375,15 @@ dependencies = [
  "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "coco"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "colored"
 version = "1.6.0"
@@ -449,6 +458,17 @@ dependencies = [
 name = "completion"
 version = "0.1.0"
 
+[[package]]
+name = "context"
+version = "2.0.0"
+source = "git+https://github.com/Zoxc/context-rs.git#f932ce270044194fec0572f719ab903af0248c0d"
+dependencies = [
+ "gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "core"
 version = "0.0.0"
@@ -487,6 +507,16 @@ name = "crossbeam"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.2.0"
@@ -510,6 +540,19 @@ dependencies = [
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-epoch"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.2.2"
@@ -518,6 +561,14 @@ dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crypto-hash"
 version = "0.3.1"
@@ -804,6 +855,11 @@ name = "futures"
 version = "0.1.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "gcc"
+version = "0.3.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "getopts"
 version = "0.2.17"
@@ -1784,18 +1840,23 @@ dependencies = [
  "fmt_macros 0.0.0",
  "graphviz 0.0.0",
  "jobserver 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "polonius-engine 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc_macro 0.0.0",
+ "rustc-rayon 0.9.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
+ "rustc-rayon-core 1.3.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
  "rustc_apfloat 0.0.0",
  "rustc_data_structures 0.0.0",
  "rustc_errors 0.0.0",
  "rustc_target 0.0.0",
+ "scoped-tls 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serialize 0.0.0",
  "syntax 0.0.0",
  "syntax_pos 0.0.0",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1918,6 +1979,15 @@ dependencies = [
  "rustc-rayon-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rustc-rayon"
+version = "0.9.0"
+source = "git+https://github.com/Zoxc/rayon.git?branch=fiber#e3840ded67c686bb55d16131cdd7423463be3e5c"
+dependencies = [
+ "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-rayon-core 1.3.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
+]
+
 [[package]]
 name = "rustc-rayon-core"
 version = "0.1.0"
@@ -1930,6 +2000,25 @@ dependencies = [
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rustc-rayon-core"
+version = "1.3.0"
+source = "git+https://github.com/Zoxc/rayon.git?branch=fiber#e3840ded67c686bb55d16131cdd7423463be3e5c"
+dependencies = [
+ "coco 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "context 2.0.0 (git+https://github.com/Zoxc/context-rs.git)",
+ "crossbeam-channel 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.40 (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 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scoped-tls 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-serialize"
 version = "0.3.24"
@@ -2044,8 +2133,8 @@ dependencies = [
  "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-rayon 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-rayon-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-rayon 0.9.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
+ "rustc-rayon-core 1.3.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
  "rustc_cratesio_shim 0.0.0",
  "serialize 0.0.0",
  "stable_deref_trait 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2061,7 +2150,8 @@ dependencies = [
  "graphviz 0.0.0",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc 0.0.0",
- "rustc-rayon 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-rayon 0.9.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
+ "rustc-rayon-core 1.3.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)",
  "rustc_allocator 0.0.0",
  "rustc_borrowck 0.0.0",
  "rustc_codegen_utils 0.0.0",
@@ -3070,16 +3160,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f0f16b89cbb9ee36d87483dc939fe9f1e13c05898d56d7b230a0d4dff033a536"
 "checksum clippy_lints 0.0.205 (registry+https://github.com/rust-lang/crates.io-index)" = "1dcb837d7510bf9e4e3b6f470c450c6d25e61116db5503a6f565bb6283860622"
 "checksum cmake 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)" = "5cf678ceebedde428000cb3a34465cf3606d1a48da17014948a916deac39da7c"
+"checksum coco 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04d5eef9c9354cbb35d5069c39054c657469d2aa7789d4c71d0a6b686dc48bea"
 "checksum colored 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b0aa3473e85a3161b59845d6096b289bb577874cafeaf75ea1b1beaa6572c7fc"
 "checksum commoncrypto 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d056a8586ba25a1e4d61cb090900e495952c7886786fc55f909ab2f819b69007"
 "checksum commoncrypto-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1fed34f46747aa73dfaa578069fd8279d2818ade2b55f38f22a9401c7f4083e2"
 "checksum compiletest_rs 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "608d9d3ccc45b63bf337d2ff5e65def5a5a52c187122232509f6b72707f61b1b"
+"checksum context 2.0.0 (git+https://github.com/Zoxc/context-rs.git)" = "<none>"
 "checksum core-foundation 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c7caa6cb9e76ddddbea09a03266d6b3bc98cd41e9fb9b017c473e7cca593ec25"
 "checksum core-foundation-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b2a53cce0ddcf7e7e1f998738d757d5a3bf08bf799a180e50ebe50d298f52f5a"
 "checksum crossbeam 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "24ce9782d4d5c53674646a6a4c1863a21a8fc0cb649b3c94dfc16e45071dea19"
+"checksum crossbeam-channel 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "862becd07e73da5746de6d9b3ba055c9bb8b10afd0d2b51155a6e30d81cd20b3"
 "checksum crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f739f8c5363aca78cfb059edf753d8f0d36908c348f3d8d1503f03d8b75d9cf3"
 "checksum crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "927121f5407de9956180ff5e936fe3cf4324279280001cd56b669d28ee7e9150"
+"checksum crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9b4e2817eb773f770dcb294127c011e22771899c21d18fce7dd739c0b9832e81"
 "checksum crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2760899e32a1d58d5abb31129f8fae5de75220bc2176e77ff7c627ae45c918d9"
+"checksum crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d636a8b3bcc1b409d7ffd3facef8f21dcb4009626adbd0c5e6c4305c07253c7b"
 "checksum crypto-hash 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "09de9ee0fc255ace04c7fa0763c9395a945c37c8292bb554f8d48361d1dcf1b4"
 "checksum curl 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)" = "aaf20bbe084f285f215eef2165feed70d6b75ba29cad24469badb853a4a287d0"
 "checksum curl-sys 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "71c63a540a9ee4e15e56c3ed9b11a2f121239b9f6d7b7fe30f616e048148df9a"
@@ -3111,6 +3206,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum futf 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "51f93f3de6ba1794dcd5810b3546d004600a59a98266487c8407bc4b24e398f3"
 "checksum futures 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)" = "0c5a3176836efa0b37f0e321b86672dfada1564aeb516fbed67b7c24050a0263"
+"checksum gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)" = "5e33ec290da0d127825013597dbdfc28bee4964690c7ce1166cbc2a7bd08b1bb"
 "checksum getopts 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "b900c08c1939860ce8b54dc6a89e26e00c04c380fd0e09796799bd7f12861e05"
 "checksum git2 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f41c0035c37ec11ed3f1e1946a76070b0c740393687e9a9c7612f6a709036b3"
 "checksum git2-curl 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b502f6b1b467957403d168f0039e0c46fa6a1220efa2adaef25d5b267b5fe024"
@@ -3216,7 +3312,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rustc-demangle 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "11fb43a206a04116ffd7cfcf9bcb941f8eb6cc7ff667272246b0a1c74259a3cb"
 "checksum rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7540fc8b0c49f096ee9c961cda096467dce8084bec6bdca2fc83895fd9b28cb8"
 "checksum rustc-rayon 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1aa5cd8c3a706edb19b6ec6aa7b056bdc635b6e99c5cf7014f9af9d92f15e99"
+"checksum rustc-rayon 0.9.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)" = "<none>"
 "checksum rustc-rayon-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d69983f8613a9c3ba1a3bbf5e8bdf2fd5c42317b1d8dd8623ca8030173bf8a6b"
+"checksum rustc-rayon-core 1.3.0 (git+https://github.com/Zoxc/rayon.git?branch=fiber)" = "<none>"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a54aa04a10c68c1c4eacb4337fd883b435997ede17a9385784b990777686b09a"
 "checksum rustfix 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9da3cf9b79dc889a2c9879643f26d7a53e37e9361c7566b7d2787d5ace0d8396"

src/bootstrap/config.rs

@@ -536,7 +536,7 @@ impl Config {
             }
             set(&mut config.wasm_syscall, rust.wasm_syscall);
             set(&mut config.lld_enabled, rust.lld);
-            config.rustc_parallel_queries = rust.experimental_parallel_queries.unwrap_or(false);
+            config.rustc_parallel_queries = rust.experimental_parallel_queries.unwrap_or(true);
             config.rustc_default_linker = rust.default_linker.clone();
             config.musl_root = rust.musl_root.clone().map(PathBuf::from);
             config.save_toolstates = rust.save_toolstates.clone().map(PathBuf::from);

src/librustc/Cargo.toml

@@ -18,6 +18,9 @@ lazy_static = "1.0.0"
 log = { version = "0.4", features = ["release_max_level_info", "std"] }
 polonius-engine = "0.5.0"
 proc_macro = { path = "../libproc_macro" }
+rustc-rayon = { git = "https://github.com/Zoxc/rayon.git", branch = "fiber" }
+rustc-rayon-core = { git = "https://github.com/Zoxc/rayon.git", branch = "fiber", features=["tlv"] }
+scoped-tls = { version = "0.1.1", features = ["nightly"] }
 rustc_apfloat = { path = "../librustc_apfloat" }
 rustc_target = { path = "../librustc_target" }
 rustc_data_structures = { path = "../librustc_data_structures" }
@@ -59,4 +62,6 @@ chalk-engine = { version = "0.6.0", default-features=false }
 flate2 = "1.0"
 tempdir = "0.3"
 
-
+[target.'cfg(windows)'.dependencies]
+kernel32-sys = "0.2.2"
+winapi = "0.2.8"

src/librustc/hir/itemlikevisit.rs

@@ -101,6 +101,17 @@ pub trait IntoVisitor<'hir> {
     fn into_visitor(&self) -> Self::Visitor;
 }
 
+#[derive(Clone)]
+pub struct ClonableVisitor<V>(pub V);
+
+impl<'hir, V: Visitor<'hir> + Clone> IntoVisitor<'hir> for ClonableVisitor<V> {
+    type Visitor = V;
+
+    fn into_visitor(&self) -> V {
+        self.clone().0
+    }
+}
+
 pub struct ParDeepVisitor<V>(pub V);
 
 impl<'hir, V> ParItemLikeVisitor<'hir> for ParDeepVisitor<V>

src/librustc/hir/mod.rs

@@ -758,6 +758,13 @@ impl Crate {
         });
     }
 
+    pub fn par_deep_visit_items<'hir, V>(&'hir self, visitor: V)
+        where V: intravisit::Visitor<'hir> + Clone + Sync + Send
+    {
+        let visitor = itemlikevisit::ClonableVisitor(visitor);
+        self.par_visit_all_item_likes(&itemlikevisit::ParDeepVisitor(visitor));
+    }
+
     pub fn body(&self, id: BodyId) -> &Body {
         &self.bodies[&id]
     }

src/librustc/lib.rs

@@ -40,6 +40,8 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
 
+#![feature(asm)]
+#![feature(attr_literals)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(const_fn)]
@@ -48,6 +50,7 @@
 #![feature(entry_or_default)]
 #![feature(from_ref)]
 #![feature(fs_read_write)]
+#![feature(iterator_step_by)]
 #![feature(iterator_find_map)]
 #![cfg_attr(windows, feature(libc))]
 #![cfg_attr(stage0, feature(macro_lifetime_matcher))]
@@ -61,6 +64,7 @@
 #![feature(optin_builtin_traits)]
 #![feature(refcell_replace_swap)]
 #![feature(rustc_diagnostic_macros)]
+#![feature(set_stdio)]
 #![feature(slice_patterns)]
 #![feature(slice_sort_by_cached_key)]
 #![feature(specialization)]
@@ -73,6 +77,7 @@
 #![feature(in_band_lifetimes)]
 #![feature(macro_at_most_once_rep)]
 #![feature(inclusive_range_methods)]
+#![feature(vec_remove_item)]
 
 #![recursion_limit="512"]
 
@@ -86,13 +91,20 @@ extern crate graphviz;
 #[cfg(windows)]
 extern crate libc;
 extern crate polonius_engine;
+#[cfg(windows)]
+extern crate kernel32;
+#[cfg(windows)]
+extern crate winapi;
 extern crate rustc_target;
 #[macro_use] extern crate rustc_data_structures;
 extern crate serialize;
 extern crate rustc_errors as errors;
+extern crate rustc_rayon as rayon;
+extern crate rustc_rayon_core as rayon_core;
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;
 extern crate syntax_pos;
+#[macro_use] extern crate scoped_tls;
 extern crate jobserver;
 extern crate proc_macro;
 extern crate chalk_engine;

src/librustc/middle/intrinsicck.rs

@@ -19,12 +19,10 @@ use hir::intravisit::{self, Visitor, NestedVisitorMap};
 use hir;
 
 pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    let mut visitor = ItemVisitor {
-        tcx,
-    };
-    tcx.hir.krate().visit_all_item_likes(&mut visitor.as_deep_visitor());
+    tcx.hir.krate().par_deep_visit_items(ItemVisitor { tcx });
 }
 
+#[derive(Clone)]
 struct ItemVisitor<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>
 }

src/librustc/middle/stability.rs

@@ -324,6 +324,7 @@ impl<'a, 'tcx> Visitor<'tcx> for Annotator<'a, 'tcx> {
     }
 }
 
+#[derive(Clone)]
 struct MissingStabilityAnnotations<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
     access_levels: &'a AccessLevels,
@@ -466,8 +467,7 @@ impl<'a, 'tcx> Index<'tcx> {
 /// Cross-references the feature names of unstable APIs with enabled
 /// features and possibly prints errors.
 pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    let mut checker = Checker { tcx: tcx };
-    tcx.hir.krate().visit_all_item_likes(&mut checker.as_deep_visitor());
+    tcx.hir.krate().par_deep_visit_items(Checker { tcx: tcx });
 }
 
 /// Check whether an item marked with `deprecated(since="X")` is currently
@@ -494,6 +494,7 @@ pub fn deprecation_in_effect(since: &str) -> bool {
     }
 }
 
+#[derive(Clone)]
 struct Checker<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
 }
@@ -807,7 +808,7 @@ pub fn check_unused_or_stable_features<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
         };
         missing.check_missing_stability(ast::CRATE_NODE_ID, krate.span);
         intravisit::walk_crate(&mut missing, krate);
-        krate.visit_all_item_likes(&mut missing.as_deep_visitor());
+        krate.par_deep_visit_items(missing);
     }
 
     let ref declared_lib_features = tcx.features().declared_lib_features;

src/librustc/session/mod.rs

@@ -872,8 +872,8 @@ impl Session {
 
     /// Returns the number of query threads that should be used for this
     /// compilation
-    pub fn query_threads_from_opts(opts: &config::Options) -> usize {
-        opts.debugging_opts.query_threads.unwrap_or(1)
+    pub fn query_threads_from_opts(_opts: &config::Options) -> usize {
+        /*opts.debugging_opts.query_threads.unwrap_or(1)*/8
     }
 
     /// Returns the number of query threads that should be used for this