Auto merge of #39677 - frewsxcv:rollup, r=frewsxcv

Rollup of 9 pull requests

- Successful merges: #37928, #38699, #39589, #39598, #39599, #39641, #39649, #39653, #39671
- Failed merges:

Author: bors

Diff for: configure

@@ -649,6 +649,7 @@ opt codegen-tests 1 "run the src/test/codegen tests"
 opt option-checking 1 "complain about unrecognized options in this configure script"
 opt ninja 0 "build LLVM using the Ninja generator (for MSVC, requires building in the correct environment)"
 opt vendor 0 "enable usage of vendored Rust crates"
+opt sanitizers 0 "build the sanitizer runtimes (asan, lsan, msan, tsan)"
 
 # Optimization and debugging options. These may be overridden by the release channel, etc.
 opt_nosave optimize 1 "build optimized rust code"

Diff for: mk/cfg/aarch64-unknown-freebsd.mk

@@ -242,6 +242,10 @@ pub fn compiletest(build: &Build,
     cmd.env("RUSTC_BOOTSTRAP", "1");
     build.add_rust_test_threads(&mut cmd);
 
+    if build.config.sanitizers {
+        cmd.env("SANITIZER_SUPPORT", "1");
+    }
+
     cmd.arg("--adb-path").arg("adb");
     cmd.arg("--adb-test-dir").arg(ADB_TEST_DIR);
     if target.contains("android") {

Diff for: mk/cfg/i686-unknown-netbsd.mk

@@ -51,6 +51,17 @@ pub fn std(build: &Build, target: &str, compiler: &Compiler) {
     if compiler.stage == 0 && build.local_rebuild && !build.config.use_jemalloc {
         features.push_str(" force_alloc_system");
     }
+
+    if compiler.stage != 0 && build.config.sanitizers {
+        // This variable is used by the sanitizer runtime crates, e.g.
+        // rustc_lsan, to build the sanitizer runtime from C code
+        // When this variable is missing, those crates won't compile the C code,
+        // so we don't set this variable during stage0 where llvm-config is
+        // missing
+        // We also only build the runtimes when --enable-sanitizers (or its
+        // config.toml equivalent) is used
+        cargo.env("LLVM_CONFIG", build.llvm_config(target));
+    }
     cargo.arg("--features").arg(features)
          .arg("--manifest-path")
          .arg(build.src.join("src/rustc/std_shim/Cargo.toml"));

Diff for: src/Cargo.lock

@@ -48,6 +48,7 @@ pub struct Config {
     pub target_config: HashMap<String, Target>,
     pub full_bootstrap: bool,
     pub extended: bool,
+    pub sanitizers: bool,
 
     // llvm codegen options
     pub llvm_assertions: bool,
@@ -149,6 +150,7 @@ struct Build {
     python: Option<String>,
     full_bootstrap: Option<bool>,
     extended: Option<bool>,
+    sanitizers: Option<bool>,
 }
 
 /// TOML representation of various global install decisions.
@@ -294,6 +296,7 @@ impl Config {
         set(&mut config.vendor, build.vendor);
         set(&mut config.full_bootstrap, build.full_bootstrap);
         set(&mut config.extended, build.extended);
+        set(&mut config.sanitizers, build.sanitizers);
 
         if let Some(ref install) = toml.install {
             config.prefix = install.prefix.clone().map(PathBuf::from);
@@ -438,6 +441,7 @@ impl Config {
                 ("VENDOR", self.vendor),
                 ("FULL_BOOTSTRAP", self.full_bootstrap),
                 ("EXTENDED", self.extended),
+                ("SANITIZERS", self.sanitizers),
             }
 
             match key {

Diff for: src/bootstrap/check.rs

@@ -124,6 +124,9 @@
 # disabled by default.
 #extended = false
 
+# Build the sanitizer runtimes
+#sanitizers = false
+
 # =============================================================================
 # General install configuration options
 # =============================================================================

Diff for: src/bootstrap/compile.rs

@@ -515,9 +515,7 @@ pub fn cargo(build: &Build, stage: u32, target: &str) {
 
     let branch = match &build.config.channel[..] {
         "stable" |
-        "beta" => {
-            build.release.split(".").take(2).collect::<Vec<_>>().join(".")
-        }
+        "beta" => format!("rust-{}", build.release_num),
         _ => "master".to_string(),
     };
 

Diff for: src/bootstrap/config.rs

@@ -599,7 +599,8 @@ impl Build {
     /// Get the space-separated set of activated features for the standard
     /// library.
     fn std_features(&self) -> String {
-        let mut features = "panic-unwind".to_string();
+        let mut features = "panic-unwind asan lsan msan tsan".to_string();
+
         if self.config.debug_jemalloc {
             features.push_str(" debug-jemalloc");
         }

Diff for: src/bootstrap/config.toml.example

@@ -21,17 +21,7 @@ RUN yum upgrade -y && yum install -y \
 ENV PATH=/rustroot/bin:$PATH
 ENV LD_LIBRARY_PATH=/rustroot/lib64:/rustroot/lib
 WORKDIR /tmp
-
-# binutils < 2.22 has a bug where the 32-bit executables it generates
-# immediately segfault in Rust, so we need to install our own binutils.
-#
-# See https://github.com/rust-lang/rust/issues/20440 for more info
 COPY shared.sh build-binutils.sh /tmp/
-RUN ./build-binutils.sh
-
-# Need a newer version of gcc than centos has to compile LLVM nowadays
-COPY build-gcc.sh /tmp/
-RUN ./build-gcc.sh
 
 # We need a build of openssl which supports SNI to download artifacts from
 # static.rust-lang.org. This'll be used to link into libcurl below (and used
@@ -49,6 +39,16 @@ RUN ./build-openssl.sh
 COPY build-curl.sh /tmp/
 RUN ./build-curl.sh
 
+# binutils < 2.22 has a bug where the 32-bit executables it generates
+# immediately segfault in Rust, so we need to install our own binutils.
+#
+# See https://github.com/rust-lang/rust/issues/20440 for more info
+RUN ./build-binutils.sh
+
+# Need a newer version of gcc than centos has to compile LLVM nowadays
+COPY build-gcc.sh /tmp/
+RUN ./build-gcc.sh
+
 # CentOS 5.5 has Python 2.4 by default, but LLVM needs 2.7+
 COPY build-python.sh /tmp/
 RUN ./build-python.sh
@@ -63,6 +63,11 @@ RUN ./build-git.sh
 COPY build-cmake.sh /tmp/
 RUN ./build-cmake.sh
 
+# for sanitizers, we need kernel headers files newer than the ones CentOS ships
+# with so we install newer ones here
+COPY build-headers.sh /tmp/
+RUN ./build-headers.sh
+
 RUN curl -Lo /rustroot/dumb-init \
       https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64 && \
       chmod +x /rustroot/dumb-init
@@ -76,5 +81,5 @@ RUN curl -L https://api.pub.build.mozilla.org/tooltool/sha512/$SCCACHE_DIGEST |
 ENV HOSTS=i686-unknown-linux-gnu
 ENV HOSTS=$HOSTS,x86_64-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended --enable-sanitizers
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

Diff for: src/bootstrap/dist.rs

@@ -0,0 +1,25 @@
+#!/bin/bash
+# Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ex
+source shared.sh
+
+curl https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.2.84.tar.xz | unxz | tar x
+
+cd linux-3.2.84
+hide_output make mrproper
+hide_output make INSTALL_HDR_PATH=dest headers_install
+
+find dest/include \( -name .install -o -name ..install.cmd \) -delete
+yes | cp -fr dest/include/* /usr/include
+
+cd ..
+rm -rf linux-3.2.84

Diff for: src/bootstrap/lib.rs

@@ -22,5 +22,5 @@ RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-ini
     rm dumb-init_*.deb
 ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 
-ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
+ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --enable-sanitizers
 ENV SCRIPT python2.7 ../x.py test && python2.7 ../x.py dist

Diff for: src/ci/docker/dist-x86-linux/Dockerfile

@@ -1291,15 +1291,18 @@ guaranteed to refer to the same memory address.
 
 Constant values must not have destructors, and otherwise permit most forms of
 data. Constants may refer to the address of other constants, in which case the
-address will have the `static` lifetime. The compiler is, however, still at
-liberty to translate the constant many times, so the address referred to may not
-be stable.
+address will have elided lifetimes where applicable, otherwise – in most cases –
+defaulting to the `static` lifetime. (See below on [static lifetime elision].)
+The compiler is, however, still at liberty to translate the constant many times,
+so the address referred to may not be stable.
+
+[static lifetime elision]: #static-lifetime-elision
 
 Constants must be explicitly typed. The type may be `bool`, `char`, a number, or
 a type derived from those primitive types. The derived types are references with
 the `static` lifetime, fixed-size arrays, tuples, enum variants, and structs.
 
-```
+```rust
 const BIT1: u32 = 1 << 0;
 const BIT2: u32 = 1 << 1;
 
@@ -1317,6 +1320,8 @@ const BITS_N_STRINGS: BitsNStrings<'static> = BitsNStrings {
 };
 ```
 
+
+
 ### Static items
 
 A *static item* is similar to a *constant*, except that it represents a precise
@@ -1351,7 +1356,7 @@ running in the same process.
 Mutable statics are still very useful, however. They can be used with C
 libraries and can also be bound from C libraries (in an `extern` block).
 
-```
+```rust
 # fn atomic_add(_: &mut u32, _: u32) -> u32 { 2 }
 
 static mut LEVELS: u32 = 0;
@@ -1375,6 +1380,53 @@ unsafe fn bump_levels_unsafe2() -> u32 {
 Mutable statics have the same restrictions as normal statics, except that the
 type of the value is not required to ascribe to `Sync`.
 
+#### `'static` lifetime elision
+
+[Unstable] Both constant and static declarations of reference types have
+*implicit* `'static` lifetimes unless an explicit lifetime is specified. As
+such, the constant declarations involving `'static` above may be written
+without the lifetimes. Returning to our previous example:
+
+```rust
+# #![feature(static_in_const)]
+const BIT1: u32 = 1 << 0;
+const BIT2: u32 = 1 << 1;
+
+const BITS: [u32; 2] = [BIT1, BIT2];
+const STRING: &str = "bitstring";
+
+struct BitsNStrings<'a> {
+    mybits: [u32; 2],
+    mystring: &'a str,
+}
+
+const BITS_N_STRINGS: BitsNStrings = BitsNStrings {
+    mybits: BITS,
+    mystring: STRING,
+};
+```
+
+Note that if the `static` or `const` items include function or closure
+references, which themselves include references, the compiler will first try the
+standard elision rules ([see discussion in the nomicon][elision-nomicon]). If it
+is unable to resolve the lifetimes by its usual rules, it will default to using
+the `'static` lifetime. By way of example:
+
+[elision-nomicon]: https://doc.rust-lang.org/nomicon/lifetime-elision.html
+
+```rust,ignore
+// Resolved as `fn<'a>(&'a str) -> &'a str`.
+const RESOLVED_SINGLE: fn(&str) -> &str = ..
+
+// Resolved as `Fn<'a, 'b, 'c>(&'a Foo, &'b Bar, &'c Baz) -> usize`.
+const RESOLVED_MULTIPLE: Fn(&Foo, &Bar, &Baz) -> usize = ..
+
+// There is insufficient information to bound the return reference lifetime
+// relative to the argument lifetimes, so the signature is resolved as
+// `Fn(&'static Foo, &'static Bar) -> &'static Baz`.
+const RESOLVED_STATIC: Fn(&Foo, &Bar) -> &Baz = ..
+```
+
 ### Traits
 
 A _trait_ describes an abstract interface that types can
@@ -2072,7 +2124,9 @@ macro scope.
 
 ### Miscellaneous attributes
 
-- `deprecated` - mark the item as deprecated; the full attribute is `#[deprecated(since = "crate version", note = "...")`, where both arguments are optional.
+- `deprecated` - mark the item as deprecated; the full attribute is 
+  `#[deprecated(since = "crate version", note = "...")`, where both arguments 
+  are optional.
 - `export_name` - on statics and functions, this determines the name of the
   exported symbol.
 - `link_section` - on statics and functions, this specifies the section of the
@@ -2489,9 +2543,6 @@ The currently implemented features of the reference compiler are:
             into a Rust program. This capability, especially the signature for the
             annotated function, is subject to change.
 
-* `static_in_const` - Enables lifetime elision with a `'static` default for
-                      `const` and `static` item declarations.
-
 * `thread_local` - The usage of the `#[thread_local]` attribute is experimental
                    and should be seen as unstable. This attribute is used to
                    declare a `static` as being unique per-thread leveraging