Auto merge of #65990 - Centril:rollup-v843h4a, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #65274 (Upload toolstates.json to rust-lang-ci2)
 - #65434 (Add long error explanation for E0577)
 - #65850 (Update comments re type parameter hack in object safety)
 - #65955 (ci: revert msys2 ca-certificates hack)
 - #65959 (Fix an incorrect docstring for Immediate in librustc_mir/interpret.)
 - #65979 (Switch CrateMetadata's source_map_import_info from RwLock to Once)
 - #65981 (work around aggressive syntax feature gating)

Failed merges:

r? @ghost

src/bootstrap/lib.rs

@@ -1080,6 +1080,10 @@ impl Build {
     /// done. The file is updated immediately after this function completes.
     pub fn save_toolstate(&self, tool: &str, state: ToolState) {
         if let Some(ref path) = self.config.save_toolstates {
+            if let Some(parent) = path.parent() {
+                // Ensure the parent directory always exists
+                t!(std::fs::create_dir_all(parent));
+            }
             let mut file = t!(fs::OpenOptions::new()
                 .create(true)
                 .read(true)

src/ci/azure-pipelines/auto.yml

@@ -140,6 +140,7 @@ jobs:
         IMAGE: x86_64-gnu-aux
       x86_64-gnu-tools:
         IMAGE: x86_64-gnu-tools
+        DEPLOY_TOOLSTATES_JSON: toolstates-linux.json
       x86_64-gnu-debug:
         IMAGE: x86_64-gnu-debug
       x86_64-gnu-nopt:
@@ -262,8 +263,9 @@ jobs:
       # MSVC tools tests
       x86_64-msvc-tools:
         MSYS_BITS: 64
-        SCRIPT: src/ci/docker/x86_64-gnu-tools/checktools.sh x.py /tmp/toolstates.json windows
-        RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --save-toolstates=/tmp/toolstates.json
+        SCRIPT: src/ci/docker/x86_64-gnu-tools/checktools.sh x.py /tmp/toolstate/toolstates.json windows
+        RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --save-toolstates=/tmp/toolstate/toolstates.json
+        DEPLOY_TOOLSTATES_JSON: toolstates-windows.json
 
       # 32/64-bit MinGW builds.
       #

src/ci/azure-pipelines/steps/run.yml

@@ -183,37 +183,21 @@ steps:
   condition: and(succeeded(), not(variables.SKIP_JOB))
   displayName: Run build
 
-# If we're a deploy builder, use the `aws` command to publish everything to our
-# bucket.
-- bash: |
-    set -e
-    source src/ci/shared.sh
-    if [ "$AGENT_OS" = "Linux" ]; then
-        rm -rf obj/build/dist/doc
-        upload_dir=obj/build/dist
-    else
-        rm -rf build/dist/doc
-        upload_dir=build/dist
-    fi
-    ls -la $upload_dir
-    deploy_dir=rustc-builds
-    if [ "$DEPLOY_ALT" == "1" ]; then
-        deploy_dir=rustc-builds-alt
-    fi
-    retry aws s3 cp --no-progress --recursive --acl public-read ./$upload_dir s3://$DEPLOY_BUCKET/$deploy_dir/$BUILD_SOURCEVERSION
+- bash: src/ci/scripts/upload-artifacts.sh
   env:
     AWS_ACCESS_KEY_ID: $(UPLOAD_AWS_ACCESS_KEY_ID)
     AWS_SECRET_ACCESS_KEY: $(UPLOAD_AWS_SECRET_ACCESS_KEY)
-  condition: and(succeeded(), not(variables.SKIP_JOB), or(eq(variables.DEPLOY, '1'), eq(variables.DEPLOY_ALT, '1')))
   displayName: Upload artifacts
-
-# Upload CPU usage statistics that we've been gathering this whole time. Always
-# execute this step in case we want to inspect failed builds, but don't let
-# errors here ever fail the build since this is just informational.
-- bash: aws s3 cp --acl public-read cpu-usage.csv s3://$DEPLOY_BUCKET/rustc-builds/$BUILD_SOURCEVERSION/cpu-$CI_JOB_NAME.csv
-  env:
-    AWS_ACCESS_KEY_ID: $(UPLOAD_AWS_ACCESS_KEY_ID)
-    AWS_SECRET_ACCESS_KEY: $(UPLOAD_AWS_SECRET_ACCESS_KEY)
-  condition: variables['UPLOAD_AWS_SECRET_ACCESS_KEY']
-  continueOnError: true
-  displayName: Upload CPU usage statistics
+  # Adding a condition on DEPLOY=1 or DEPLOY_ALT=1 is not needed as all deploy
+  # builders *should* have the AWS credentials available. Still, explicitly
+  # adding the condition is helpful as this way CI will not silently skip
+  # deploying artifacts from a dist builder if the variables are misconfigured,
+  # erroring about invalid credentials instead.
+  condition: |
+    and(
+      succeeded(), not(variables.SKIP_JOB),
+      or(
+        variables.UPLOAD_AWS_SECRET_ACCESS_KEY,
+        eq(variables.DEPLOY, '1'), eq(variables.DEPLOY_ALT, '1')
+      )
+    )

src/ci/docker/run.sh

@@ -106,6 +106,7 @@ fi
 mkdir -p $HOME/.cargo
 mkdir -p $objdir/tmp
 mkdir -p $objdir/cores
+mkdir -p /tmp/toolstate
 
 args=
 if [ "$SCCACHE_BUCKET" != "" ]; then
@@ -156,6 +157,7 @@ else
   args="$args --volume $objdir:/checkout/obj"
   args="$args --volume $HOME/.cargo:/cargo"
   args="$args --volume $HOME/rustsrc:$HOME/rustsrc"
+  args="$args --volume /tmp/toolstate:/tmp/toolstate"
   args="$args --env LOCAL_USER_ID=`id -u`"
 fi
 

src/ci/docker/x86_64-gnu-tools/Dockerfile

@@ -26,5 +26,5 @@ ENV CHECK_LINKS 1
 
 ENV RUST_CONFIGURE_ARGS \
   --build=x86_64-unknown-linux-gnu \
-  --save-toolstates=/tmp/toolstates.json
-ENV SCRIPT /tmp/checktools.sh ../x.py /tmp/toolstates.json linux
+  --save-toolstates=/tmp/toolstate/toolstates.json
+ENV SCRIPT /tmp/checktools.sh ../x.py /tmp/toolstate/toolstates.json linux

src/ci/docker/x86_64-gnu-tools/checktools.sh

@@ -3,7 +3,7 @@
 set -eu
 
 X_PY="$1"
-TOOLSTATE_FILE="$(realpath $2)"
+TOOLSTATE_FILE="$(realpath -m $2)"
 OS="$3"
 COMMIT="$(git rev-parse HEAD)"
 CHANGED_FILES="$(git diff --name-status HEAD HEAD^)"
@@ -13,6 +13,7 @@ SIX_WEEK_CYCLE="$(( ($(date +%s) / 86400 - 20) % 42 ))"
 #   The Wednesday after this has value 0.
 #   We track this value to prevent regressing tools in the last week of the 6-week cycle.
 
+mkdir -p "$(dirname $TOOLSTATE_FILE)"
 touch "$TOOLSTATE_FILE"
 
 # Try to test all the tools and store the build/test success in the TOOLSTATE_FILE

src/ci/scripts/install-msys2-packages.sh

@@ -8,14 +8,6 @@ source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 if isWindows; then
     pacman -S --noconfirm --needed base-devel ca-certificates make diffutils tar
 
-    # FIXME(#65767): workaround msys bug, step 2
-    arch=i686
-    if [ "$MSYS_BITS" = "64" ]; then
-      arch=x86_64
-    fi
-    pacman -U --noconfirm --noprogressbar mingw-w64-$arch-ca-certificates-20180409-1-any.pkg.tar.xz
-    rm mingw-w64-$arch-ca-certificates-20180409-1-any.pkg.tar.xz
-
     # Make sure we use the native python interpreter instead of some msys equivalent
     # one way or another. The msys interpreters seem to have weird path conversions
     # baked in which break LLVM's build system one way or another, so let's use the

src/ci/scripts/install-msys2.sh

@@ -1,5 +1,4 @@
 #!/bin/bash
-# ignore-tidy-linelength
 # Download and install MSYS2, needed primarily for the test suite (run-make) but
 # also used by the MinGW toolchain for assembling things.
 #
@@ -13,13 +12,6 @@ IFS=$'\n\t'
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
 if isWindows; then
-    # FIXME(#65767): workaround msys bug, step 1
-    arch=i686
-    if [ "$MSYS_BITS" = "64" ]; then
-      arch=x86_64
-    fi
-    curl -O "${MIRRORS_BASE}/msys2-repo/mingw/$arch/mingw-w64-$arch-ca-certificates-20180409-1-any.pkg.tar.xz"
-
     choco install msys2 --params="/InstallDir:${SYSTEM_WORKFOLDER}/msys2 /NoPath" -y --no-progress
     mkdir -p "${SYSTEM_WORKFOLDER}/msys2/home/${USERNAME}"
 

src/ci/scripts/upload-artifacts.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Upload all the artifacts to our S3 bucket. All the files inside ${upload_dir}
+# will be uploaded to the deploy bucket and eventually signed and released in
+# static.rust-lang.org.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
+
+upload_dir="$(mktemp -d)"
+
+# Release tarballs produced by a dist builder.
+if [[ "${DEPLOY-0}" -eq "1" ]] || [[ "${DEPLOY_ALT-0}" -eq "1" ]]; then
+    dist_dir=build/dist
+    if isLinux; then
+        dist_dir=obj/build/dist
+    fi
+    rm -rf "${dist_dir}/doc"
+    cp -r "${dist_dir}"/* "${upload_dir}"
+fi
+
+# CPU usage statistics.
+cp cpu-usage.csv "${upload_dir}/cpu-${CI_JOB_NAME}.csv"
+
+# Toolstate data.
+if [[ -n "${DEPLOY_TOOLSTATES_JSON+x}" ]]; then
+    cp /tmp/toolstate/toolstates.json "${upload_dir}/${DEPLOY_TOOLSTATES_JSON}"
+fi
+
+echo "Files that will be uploaded:"
+ls -lah "${upload_dir}"
+echo
+
+deploy_dir="rustc-builds"
+if [[ "${DEPLOY_ALT-0}" -eq "1" ]]; then
+    deploy_dir="rustc-builds-alt"
+fi
+deploy_url="s3://${DEPLOY_BUCKET}/${deploy_dir}/$(ciCommit)"
+
+retry aws s3 cp --no-progress --recursive --acl public-read "${upload_dir}" "${deploy_url}"

src/ci/shared.sh

@@ -46,6 +46,10 @@ function getCIBranch {
   echo "$BUILD_SOURCEBRANCHNAME"
 }
 
+function ciCommit {
+  echo "${BUILD_SOURCEVERSION}"
+}
+
 function ciCommandAddPath {
     if [[ $# -ne 1 ]]; then
         echo "usage: $0 <path>"

src/libcore/lib.rs

@@ -133,6 +133,7 @@
 #[allow(unused)]
 use prelude::v1::*;
 
+#[cfg(not(test))] // See #65860
 #[macro_use]
 mod macros;
 
@@ -180,40 +181,51 @@ pub mod hint;
 
 /* Core language traits */
 
+#[cfg(not(test))] // See #65860
 pub mod marker;
 pub mod ops;
+#[cfg(not(test))] // See #65860
 pub mod cmp;
+#[cfg(not(test))] // See #65860
 pub mod clone;
+#[cfg(not(test))] // See #65860
 pub mod default;
 pub mod convert;
 pub mod borrow;
 
 /* Core types and methods on primitives */
 
 pub mod any;
+#[cfg(not(test))] // See #65860
 pub mod array;
 pub mod ascii;
 pub mod sync;
 pub mod cell;
 pub mod char;
 pub mod panic;
 pub mod panicking;
+#[cfg(not(test))] // See #65860
 pub mod pin;
+#[cfg(not(test))] // See #65860
 pub mod iter;
 pub mod option;
 pub mod raw;
 pub mod result;
 pub mod ffi;
 
 pub mod slice;
+#[cfg(not(test))] // See #65860
 pub mod str;
+#[cfg(not(test))] // See #65860
 pub mod hash;
+#[cfg(not(test))] // See #65860
 pub mod fmt;
 pub mod time;
 
 pub mod unicode;
 
 /* Async */
+#[cfg(not(test))] // See #65860
 pub mod future;
 pub mod task;
 

src/librustc/traits/object_safety.rs

@@ -520,9 +520,11 @@ impl<'tcx> TyCtxt<'tcx> {
     /// a pointer.
     ///
     /// In practice, we cannot use `dyn Trait` explicitly in the obligation because it would result
-    /// in a new check that `Trait` is object safe, creating a cycle. So instead, we fudge a little
-    /// by introducing a new type parameter `U` such that `Self: Unsize<U>` and `U: Trait + ?Sized`,
-    /// and use `U` in place of `dyn Trait`. Written as a chalk-style query:
+    /// in a new check that `Trait` is object safe, creating a cycle (until object_safe_for_dispatch
+    /// is stabilized, see tracking issue https://github.com/rust-lang/rust/issues/43561).
+    /// Instead, we fudge a little by introducing a new type parameter `U` such that
+    /// `Self: Unsize<U>` and `U: Trait + ?Sized`, and use `U` in place of `dyn Trait`.
+    /// Written as a chalk-style query:
     ///
     ///     forall (U: Trait + ?Sized) {
     ///         if (Self: Unsize<U>) {
@@ -556,8 +558,8 @@ impl<'tcx> TyCtxt<'tcx> {
 
         // the type `U` in the query
         // use a bogus type parameter to mimick a forall(U) query using u32::MAX for now.
-        // FIXME(mikeyhew) this is a total hack, and we should replace it when real forall queries
-        // are implemented
+        // FIXME(mikeyhew) this is a total hack. Once object_safe_for_dispatch is stabilized, we can
+        // replace this with `dyn Trait`
         let unsized_self_ty: Ty<'tcx> = self.mk_ty_param(
             ::std::u32::MAX,
             Symbol::intern("RustaceansAreAwesome"),

src/librustc_data_structures/sync.rs

@@ -497,13 +497,15 @@ impl<T> Once<T> {
     /// If the value was already initialized the closure is not called and `false` is returned,
     /// otherwise if the value from the closure initializes the inner value, `true` is returned
     #[inline]
-    pub fn init_locking<F: FnOnce() -> T>(&self, f: F) -> bool {
-        let mut lock = self.0.lock();
-        if lock.is_some() {
-            return false;
+    pub fn init_locking<F: FnOnce() -> T>(&self, f: F) -> &T {
+        {
+            let mut lock = self.0.lock();
+            if lock.is_none() {
+                *lock = Some(f());
+            }
         }
-        *lock = Some(f());
-        true
+
+        self.borrow()
     }
 
     /// Tries to initialize the inner value by calling the closure without ensuring that no-one

src/librustc_metadata/creader.rs

@@ -3,7 +3,7 @@
 use crate::cstore::{self, CStore, MetadataBlob};
 use crate::locator::{self, CratePaths};
 use crate::schema::{CrateRoot, CrateDep};
-use rustc_data_structures::sync::{RwLock, Lock, AtomicCell};
+use rustc_data_structures::sync::{Lock, Once, AtomicCell};
 
 use rustc::hir::def_id::CrateNum;
 use rustc_data_structures::svh::Svh;
@@ -249,7 +249,7 @@ impl<'a> CrateLoader<'a> {
             cnum_map,
             cnum,
             dependencies: Lock::new(dependencies),
-            source_map_import_info: RwLock::new(vec![]),
+            source_map_import_info: Once::new(),
             alloc_decoding_state: AllocDecodingState::new(interpret_alloc_index),
             dep_kind: Lock::new(dep_kind),
             source,

src/librustc_metadata/cstore.rs

@@ -9,7 +9,7 @@ use rustc::middle::cstore::{CrateSource, DepKind, ExternCrate};
 use rustc::mir::interpret::AllocDecodingState;
 use rustc_index::vec::IndexVec;
 use rustc::util::nodemap::FxHashMap;
-use rustc_data_structures::sync::{Lrc, RwLock, Lock, MetadataRef, AtomicCell};
+use rustc_data_structures::sync::{Lrc, Lock, MetadataRef, Once, AtomicCell};
 use syntax::ast;
 use syntax::edition::Edition;
 use syntax_expand::base::SyntaxExtension;
@@ -62,7 +62,7 @@ crate struct CrateMetadata {
     /// Proc macro descriptions for this crate, if it's a proc macro crate.
     crate raw_proc_macros: Option<&'static [ProcMacro]>,
     /// Source maps for code from the crate.
-    crate source_map_import_info: RwLock<Vec<ImportedSourceFile>>,
+    crate source_map_import_info: Once<Vec<ImportedSourceFile>>,
     /// Used for decoding interpret::AllocIds in a cached & thread-safe manner.
     crate alloc_decoding_state: AllocDecodingState,
     /// The `DepNodeIndex` of the `DepNode` representing this upstream crate.