Rollup of 4 pull requests

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -279,13 +279,23 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             Entry::Occupied(mut entry) => {
                 debug!(" - composing on top of {:?}", entry.get());
-                match (&entry.get()[..], &adj[..]) {
-                    // Applying any adjustment on top of a NeverToAny
-                    // is a valid NeverToAny adjustment, because it can't
-                    // be reached.
-                    (&[Adjustment { kind: Adjust::NeverToAny, .. }], _) => return,
+                match (&mut entry.get_mut()[..], &adj[..]) {
                     (
-                        &[
+                        [Adjustment { kind: Adjust::NeverToAny, target }],
+                        &[.., Adjustment { target: new_target, .. }],
+                    ) => {
+                        // NeverToAny coercion can target any type, so instead of adding a new
+                        // adjustment on top we can change the target.
+                        //
+                        // This is required for things like `a == a` (where `a: !`) to produce
+                        // valid MIR -- we need borrow adjustment from things like `==` to change
+                        // the type to `&!` (or `&()` depending on the fallback). This might be
+                        // relevant even in unreachable code.
+                        *target = new_target;
+                    }
+
+                    (
+                        &mut [
                             Adjustment { kind: Adjust::Deref(_), .. },
                             Adjustment { kind: Adjust::Borrow(AutoBorrow::Ref(..)), .. },
                         ],
@@ -294,11 +304,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             .., // Any following adjustments are allowed.
                         ],
                     ) => {
-                        // A reborrow has no effect before a dereference.
+                        // A reborrow has no effect before a dereference, so we can safely replace adjustments.
+                        *entry.get_mut() = adj;
                     }
-                    // FIXME: currently we never try to compose autoderefs
-                    // and ReifyFnPointer/UnsafeFnPointer, but we could.
+
                     _ => {
+                        // FIXME: currently we never try to compose autoderefs
+                        // and ReifyFnPointer/UnsafeFnPointer, but we could.
                         self.dcx().span_delayed_bug(
                             expr.span,
                             format!(
@@ -308,9 +320,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 adj
                             ),
                         );
+
+                        *entry.get_mut() = adj;
                     }
                 }
-                *entry.get_mut() = adj;
             }
         }
 

src/bootstrap/Cargo.lock

@@ -236,12 +236,6 @@ dependencies = [
  "crypto-common",
 ]
 
-[[package]]
-name = "either"
-version = "1.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
-
 [[package]]
 name = "errno"
 version = "0.3.8"
@@ -448,26 +442,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rayon"
-version = "1.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c27db03db7734835b3f53954b534c91069375ce6ccaa2e065441e07d9b6cdb1"
-dependencies = [
- "either",
- "rayon-core",
-]
-
-[[package]]
-name = "rayon-core"
-version = "1.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ce3fb6ad83f861aac485e76e1985cd109d9a3713802152be56c3b1f0e0658ed"
-dependencies = [
- "crossbeam-deque",
- "crossbeam-utils",
-]
-
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -598,7 +572,6 @@ dependencies = [
  "libc",
  "ntapi",
  "once_cell",
- "rayon",
  "windows",
 ]
 

src/bootstrap/Cargo.toml

@@ -64,7 +64,7 @@ walkdir = "2.4"
 xz2 = "0.1"
 
 # Dependencies needed by the build-metrics feature
-sysinfo = { version = "0.30", optional = true }
+sysinfo = { version = "0.30", default-features = false, optional = true }
 
 [target.'cfg(windows)'.dependencies.junction]
 version = "1.0.0"

src/librustdoc/html/static/js/search.js

@@ -1464,16 +1464,7 @@ function initSearch(rawSearchIndex) {
                 return 0;
             });
 
-            const transformed = transformResults(result_list);
-            const descs = await Promise.all(transformed.map(result => {
-                return searchIndexEmptyDesc.get(result.crate).contains(result.bitIndex) ?
-                    "" :
-                    searchState.loadDesc(result);
-            }));
-            for (const [i, result] of transformed.entries()) {
-                result.desc = descs[i];
-            }
-            return transformed;
+            return transformResults(result_list);
         }
 
         /**
@@ -2517,6 +2508,16 @@ function initSearch(rawSearchIndex) {
             sorted_others,
             parsedQuery);
         handleAliases(ret, parsedQuery.original.replace(/"/g, ""), filterCrates, currentCrate);
+        await Promise.all([ret.others, ret.returned, ret.in_args].map(async list => {
+            const descs = await Promise.all(list.map(result => {
+                return searchIndexEmptyDesc.get(result.crate).contains(result.bitIndex) ?
+                    "" :
+                    searchState.loadDesc(result);
+            }));
+            for (const [i, result] of list.entries()) {
+                result.desc = descs[i];
+            }
+        }));
         if (parsedQuery.error !== null && ret.others.length !== 0) {
             // It means some doc aliases were found so let's "remove" the error!
             ret.query.error = null;

src/tools/run-make-support/src/clang.rs

@@ -0,0 +1,73 @@
+use std::env;
+use std::path::Path;
+use std::process::Command;
+
+use crate::{bin_name, handle_failed_output, tmp_dir};
+
+/// Construct a new `clang` invocation. `clang` is not always available for all targets.
+pub fn clang() -> Clang {
+    Clang::new()
+}
+
+/// A `clang` invocation builder.
+#[derive(Debug)]
+pub struct Clang {
+    cmd: Command,
+}
+
+crate::impl_common_helpers!(Clang);
+
+impl Clang {
+    /// Construct a new `clang` invocation. `clang` is not always available for all targets.
+    pub fn new() -> Self {
+        let clang =
+            env::var("CLANG").expect("`CLANG` not specified, but this is required to find `clang`");
+        let cmd = Command::new(clang);
+        Self { cmd }
+    }
+
+    /// Provide an input file.
+    pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
+    /// Specify the name of the executable. The executable will be placed under `$TMPDIR`, and the
+    /// extension will be determined by [`bin_name`].
+    pub fn out_exe(&mut self, name: &str) -> &mut Self {
+        self.cmd.arg("-o");
+        self.cmd.arg(tmp_dir().join(bin_name(name)));
+        self
+    }
+
+    /// Specify which target triple clang should target.
+    pub fn target(&mut self, target_triple: &str) -> &mut Self {
+        self.cmd.arg("-target");
+        self.cmd.arg(target_triple);
+        self
+    }
+
+    /// Pass `-nostdlib` to disable linking the C standard library.
+    pub fn no_stdlib(&mut self) -> &mut Self {
+        self.cmd.arg("-nostdlib");
+        self
+    }
+
+    /// Specify architecture.
+    pub fn arch(&mut self, arch: &str) -> &mut Self {
+        self.cmd.arg(format!("-march={arch}"));
+        self
+    }
+
+    /// Specify LTO settings.
+    pub fn lto(&mut self, lto: &str) -> &mut Self {
+        self.cmd.arg(format!("-flto={lto}"));
+        self
+    }
+
+    /// Specify which ld to use.
+    pub fn use_ld(&mut self, ld: &str) -> &mut Self {
+        self.cmd.arg(format!("-fuse-ld={ld}"));
+        self
+    }
+}

src/tools/run-make-support/src/lib.rs

@@ -4,6 +4,8 @@
 //! as `object` or `wasmparser`, they can be re-exported and be made available through this library.
 
 pub mod cc;
+pub mod clang;
+pub mod llvm_readobj;
 pub mod run;
 pub mod rustc;
 pub mod rustdoc;
@@ -17,6 +19,8 @@ pub use regex;
 pub use wasmparser;
 
 pub use cc::{cc, extra_c_flags, extra_cxx_flags, Cc};
+pub use clang::{clang, Clang};
+pub use llvm_readobj::{llvm_readobj, LlvmReadobj};
 pub use run::{run, run_fail};
 pub use rustc::{aux_build, rustc, Rustc};
 pub use rustdoc::{bare_rustdoc, rustdoc, Rustdoc};

src/tools/run-make-support/src/llvm_readobj.rs

@@ -0,0 +1,44 @@
+use std::env;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+use crate::handle_failed_output;
+
+/// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
+/// at `$LLVM_BIN_DIR/llvm-readobj`.
+pub fn llvm_readobj() -> LlvmReadobj {
+    LlvmReadobj::new()
+}
+
+/// A `llvm-readobj` invocation builder.
+#[derive(Debug)]
+pub struct LlvmReadobj {
+    cmd: Command,
+}
+
+crate::impl_common_helpers!(LlvmReadobj);
+
+impl LlvmReadobj {
+    /// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
+    /// at `$LLVM_BIN_DIR/llvm-readobj`.
+    pub fn new() -> Self {
+        let llvm_bin_dir = env::var("LLVM_BIN_DIR")
+            .expect("`LLVM_BIN_DIR` not specified, but this is required to find `llvm-readobj`");
+        let llvm_bin_dir = PathBuf::from(llvm_bin_dir);
+        let llvm_readobj = llvm_bin_dir.join("llvm-readobj");
+        let cmd = Command::new(llvm_readobj);
+        Self { cmd }
+    }
+
+    /// Provide an input file.
+    pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
+    /// Pass `--file-header` to display file headers.
+    pub fn file_header(&mut self) -> &mut Self {
+        self.cmd.arg("--file-header");
+        self
+    }
+}

tests/mir-opt/building/eq_never_type._f.built.after.mir

@@ -0,0 +1,53 @@
+// MIR for `_f` after built
+
+fn _f(_1: !, _2: !) -> () {
+    debug a => _1;
+    debug b => _2;
+    let mut _0: ();
+    let mut _3: !;
+    let _4: bool;
+    let mut _5: &();
+    let mut _6: !;
+    let mut _7: &();
+    let _8: ();
+    let mut _9: !;
+
+    bb0: {
+        StorageLive(_4);
+        StorageLive(_5);
+        StorageLive(_6);
+        _6 = _1;
+        unreachable;
+    }
+
+    bb1: {
+        StorageDead(_6);
+        StorageLive(_7);
+        StorageLive(_8);
+        StorageLive(_9);
+        _9 = _2;
+        unreachable;
+    }
+
+    bb2: {
+        _7 = &_8;
+        StorageDead(_9);
+        _4 = <() as PartialEq>::eq(move _5, move _7) -> [return: bb3, unwind: bb5];
+    }
+
+    bb3: {
+        StorageDead(_7);
+        StorageDead(_5);
+        StorageDead(_8);
+        StorageDead(_4);
+        unreachable;
+    }
+
+    bb4: {
+        return;
+    }
+
+    bb5 (cleanup): {
+        resume;
+    }
+}

tests/mir-opt/building/eq_never_type.rs

@@ -0,0 +1,13 @@
+// skip-filecheck
+#![feature(never_type)]
+#![allow(unreachable_code)]
+
+// EMIT_MIR eq_never_type._f.built.after.mir
+fn _f(a: !, b: !) {
+    // Both arguments must be references (i.e. == should auto-borrow/coerce-to-ref both arguments)
+    // (this previously was buggy due to `NeverToAny` coercion incorrectly throwing out other
+    // coercions)
+    a == b;
+}
+
+fn main() {}