Use `jemalloc-sys` on Linux and OSX compilers

This commit adds opt-in support to the compiler to link to `jemalloc` in
the compiler. When activated the compiler will depend on `jemalloc-sys`,
instruct jemalloc to unprefix its symbols, and then link to it. The
feature is activated by default on Linux/OSX compilers for x86_64/i686
platforms, and it's not enabled anywhere else for now. We may be able to
opt-in other platforms in the future! Also note that the opt-in only
happens on CI, it's otherwise unconditionally turned off by default.

Closes #36963

10 files changed, 49 insertions, 6 deletions

diff --git a/src/Cargo.lock b/src/Cargo.lock
index db111b5d2b5..dce5d4eb512 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -786,6 +786,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "fs_extra"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "fst"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -997,6 +1002,16 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "jemalloc-sys"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "jobserver"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2181,6 +2196,7 @@ dependencies = [
  "arena 0.0.0",
  "env_logger 0.5.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "graphviz 0.0.0",
+ "jemalloc-sys 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc 0.0.0",
  "rustc-rayon 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3237,6 +3253,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 "checksum fs2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9564fc758e15025b46aa6643b1b77d047d1a56a1aea6e01002ac0c7026876213"
+"checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fst 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d94485a00b1827b861dd9d1a2cc9764f9044d4c535514c0760a5a2012ef3399f"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
@@ -3259,6 +3276,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum is-match 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7e5b386aef33a1c677be65237cb9d32c3f3ef56bd035949710c4bb13083eb053"
 "checksum itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
+"checksum jemalloc-sys 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "bfc62c8e50e381768ce8ee0428ee53741929f7ebd73e4d83f669bcf7693e00ae"
 "checksum jobserver 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "60af5f849e1981434e4a31d3d782c4774ae9b434ce55b101a96ecfd09147e8be"
 "checksum json 0.11.13 (registry+https://github.com/rust-lang/crates.io-index)" = "9ad0485404155f45cce53a40d4b2d6ac356418300daed05273d9e26f91c390be"
 "checksum jsonrpc-core 8.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ddf83704f4e79979a424d1082dd2c1e52683058056c9280efa19ac5f6bc9033c"
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 791d2490d97..0f249eee000 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -116,6 +116,7 @@ pub struct Config {
     pub hosts: Vec<Interned<String>>,
     pub targets: Vec<Interned<String>>,
     pub local_rebuild: bool,
+    pub jemalloc: bool,
 
     // dist misc
     pub dist_sign_folder: Option<PathBuf>,
@@ -260,7 +261,7 @@ struct Llvm {
     link_jobs: Option<u32>,
     link_shared: Option<bool>,
     version_suffix: Option<String>,
-    clang_cl: Option<String>
+    clang_cl: Option<String>,
 }
 
 #[derive(Deserialize, Default, Clone)]
@@ -324,6 +325,7 @@ struct Rust {
     backtrace_on_ice: Option<bool>,
     verify_llvm_ir: Option<bool>,
     remap_debuginfo: Option<bool>,
+    jemalloc: Option<bool>,
 }
 
 /// TOML representation of how each build target is configured.
@@ -537,6 +539,7 @@ impl Config {
             set(&mut config.rust_debuginfo_tests, rust.debuginfo_tests);
             set(&mut config.codegen_tests, rust.codegen_tests);
             set(&mut config.rust_rpath, rust.rpath);
+            set(&mut config.jemalloc, rust.jemalloc);
             set(&mut config.backtrace, rust.backtrace);
             set(&mut config.channel, rust.channel.clone());
             set(&mut config.rust_dist_src, rust.dist_src);
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index bd768d5e1a2..8159fb182a1 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -530,7 +530,11 @@ impl Build {
 
     /// Get the space-separated set of activated features for the compiler.
     fn rustc_features(&self) -> String {
-        String::new()
+        let mut features = String::new();
+        if self.config.jemalloc {
+            features.push_str("jemalloc");
+        }
+        features
     }
 
     /// Component directory that Cargo will produce output into (e.g.
diff --git a/src/ci/docker/dist-i686-linux/Dockerfile b/src/ci/docker/dist-i686-linux/Dockerfile
index d99e409e426..8df49f364a3 100644
--- a/src/ci/docker/dist-i686-linux/Dockerfile
+++ b/src/ci/docker/dist-i686-linux/Dockerfile
@@ -98,7 +98,8 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-sanitizers \
       --enable-profiler \
       --set target.i686-unknown-linux-gnu.linker=clang \
-      --build=i686-unknown-linux-gnu
+      --build=i686-unknown-linux-gnu \
+      --set rust.jemalloc
 ENV SCRIPT python2.7 ../x.py dist --build $HOSTS --host $HOSTS --target $HOSTS
 ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER=clang
 
diff --git a/src/ci/docker/dist-x86_64-linux/Dockerfile b/src/ci/docker/dist-x86_64-linux/Dockerfile
index 8696f72e0e3..0a2dae72f73 100644
--- a/src/ci/docker/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/dist-x86_64-linux/Dockerfile
@@ -101,7 +101,8 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.linker=clang \
       --set target.x86_64-unknown-linux-gnu.ar=/rustroot/bin/llvm-ar \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
-      --set llvm.thin-lto=true
+      --set llvm.thin-lto=true \
+      --set rust.jemalloc
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS
 ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
 
diff --git a/src/librustc_driver/Cargo.toml b/src/librustc_driver/Cargo.toml
index 470c8b03d0b..1e32f5ef6f0 100644
--- a/src/librustc_driver/Cargo.toml
+++ b/src/librustc_driver/Cargo.toml
@@ -38,3 +38,8 @@ syntax = { path = "../libsyntax" }
 smallvec = { version = "0.6.5", features = ["union"] }
 syntax_ext = { path = "../libsyntax_ext" }
 syntax_pos = { path = "../libsyntax_pos" }
+
+[dependencies.jemalloc-sys]
+version = '0.1.8'
+optional = true
+features = ['unprefixed_malloc_on_supported_platforms']
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index 276b7290c2e..e8fdaddaeb8 100644
--- a/src/librustc_driver/lib.rs
+++ b/src/librustc_driver/lib.rs
@@ -64,6 +64,14 @@ extern crate syntax;
 extern crate syntax_ext;
 extern crate syntax_pos;
 
+// Note that the linkage here should be all that we need, on Linux we're not
+// prefixing the symbols here so this should naturally override our default
+// allocator. On OSX it should override via the zone allocator. We shouldn't
+// enable this by default on other platforms, so other platforms aren't handled
+// here yet.
+#[cfg(feature = "jemalloc-sys")]
+extern crate jemalloc_sys;
+
 use driver::CompileController;
 use pretty::{PpMode, UserIdentifiedItem};
 
diff --git a/src/librustc_target/spec/arm_linux_androideabi.rs b/src/librustc_target/spec/arm_linux_androideabi.rs
index c5e3385a91c..055bca6c348 100644
--- a/src/librustc_target/spec/arm_linux_androideabi.rs
+++ b/src/librustc_target/spec/arm_linux_androideabi.rs
@@ -14,7 +14,7 @@ pub fn target() -> TargetResult {
     let mut base = super::android_base::opts();
     // https://developer.android.com/ndk/guides/abis.html#armeabi
     base.features = "+strict-align,+v5te".to_string();
-    base.max_atomic_width = Some(64);
+    base.max_atomic_width = Some(32);
 
     Ok(Target {
         llvm_target: "arm-linux-androideabi".to_string(),
diff --git a/src/rustc/Cargo.toml b/src/rustc/Cargo.toml
index 7a31afed8c3..ec822fddef3 100644
--- a/src/rustc/Cargo.toml
+++ b/src/rustc/Cargo.toml
@@ -10,3 +10,6 @@ path = "rustc.rs"
 [dependencies]
 rustc_target = { path = "../librustc_target" }
 rustc_driver = { path = "../librustc_driver" }
+
+[features]
+jemalloc = ['rustc_driver/jemalloc-sys']
diff --git a/src/tools/tidy/src/cargo.rs b/src/tools/tidy/src/cargo.rs
index da0cd8b6652..466d2fa0d2b 100644
--- a/src/tools/tidy/src/cargo.rs
+++ b/src/tools/tidy/src/cargo.rs
@@ -84,7 +84,7 @@ fn verify(tomlfile: &Path, libfile: &Path, bad: &mut bool) {
 
         // This is intentional, this dependency just makes the crate available
         // for others later on. Cover cases
-        let whitelisted = whitelisted || krate.starts_with("panic");
+        let whitelisted = krate.starts_with("panic");
         if toml.contains("name = \"std\"") && whitelisted {
             continue
         }