Auto merge of #92592 - Mark-Simulacrum:beta-next, r=Mark-Simulacrum

[beta] backports

Backports these PRs:

* Fix HashStable implementation on InferTy #91892
* Revert setting a default for the MACOSX_DEPLOYMENT_TARGET env var for linking #91870
* Make rustdoc headings black, and markdown blue #91534
* Disable LLVM newPM by default #91190
* Deduplicate projection sub-obligations #90423
*  Sync portable-simd to remove autosplats #91484 by dropping portable_simd entirely (keeping the subtree, just from std/core)
*  Quote bat script command line #92208
* Fix failing tests #92201 (CI fix)

r? `@Mark-Simulacrum`

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -395,18 +395,14 @@ fn get_pgo_sample_use_path(config: &ModuleConfig) -> Option<CString> {
 }
 
 pub(crate) fn should_use_new_llvm_pass_manager(
-    cgcx: &CodegenContext<LlvmCodegenBackend>,
+    _cgcx: &CodegenContext<LlvmCodegenBackend>,
     config: &ModuleConfig,
 ) -> bool {
-    // The new pass manager is enabled by default for LLVM >= 13.
-    // This matches Clang, which also enables it since Clang 13.
-
-    // FIXME: There are some perf issues with the new pass manager
-    // when targeting s390x, so it is temporarily disabled for that
-    // arch, see https://github.com/rust-lang/rust/issues/89609
+    // The new pass manager is causing significant performance issues such as #91128, and is
+    // therefore disabled in stable versions of rustc by default.
     config
         .new_llvm_pass_manager
-        .unwrap_or_else(|| cgcx.target_arch != "s390x" && llvm_util::get_version() >= (13, 0, 0))
+        .unwrap_or(false)
 }
 
 pub(crate) unsafe fn optimize_with_new_llvm_pass_manager(

compiler/rustc_target/src/spec/aarch64_apple_darwin.rs

@@ -9,7 +9,6 @@ pub fn target() -> Target {
     base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::THREAD;
 
     base.pre_link_args.insert(LinkerFlavor::Gcc, vec!["-arch".to_string(), "arm64".to_string()]);
-    base.link_env.extend(super::apple_base::macos_link_env("arm64"));
     base.link_env_remove.extend(super::apple_base::macos_link_env_remove());
 
     // Clang automatically chooses a more specific target based on

compiler/rustc_target/src/spec/apple_base.rs

@@ -79,18 +79,6 @@ pub fn macos_llvm_target(arch: &str) -> String {
     format!("{}-apple-macosx{}.{}.0", arch, major, minor)
 }
 
-pub fn macos_link_env(arch: &str) -> Vec<(String, String)> {
-    // Use the default deployment target for linking just as with the LLVM target if not
-    // specified via MACOSX_DEPLOYMENT_TARGET, otherwise the system linker would use its
-    // default which varies with Xcode version.
-    if env::var("MACOSX_DEPLOYMENT_TARGET").is_err() {
-        let default = macos_default_deployment_target(arch);
-        vec![("MACOSX_DEPLOYMENT_TARGET".to_string(), format!("{}.{}", default.0, default.1))]
-    } else {
-        vec![]
-    }
-}
-
 pub fn macos_link_env_remove() -> Vec<String> {
     let mut env_remove = Vec::with_capacity(2);
     // Remove the `SDKROOT` environment variable if it's clearly set for the wrong platform, which

compiler/rustc_target/src/spec/i686_apple_darwin.rs

@@ -5,7 +5,6 @@ pub fn target() -> Target {
     base.cpu = "yonah".to_string();
     base.max_atomic_width = Some(64);
     base.pre_link_args.insert(LinkerFlavor::Gcc, vec!["-m32".to_string()]);
-    base.link_env.extend(super::apple_base::macos_link_env("i686"));
     base.link_env_remove.extend(super::apple_base::macos_link_env_remove());
     // don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
     base.stack_probes = StackProbeType::Call;

compiler/rustc_target/src/spec/x86_64_apple_darwin.rs

@@ -10,7 +10,6 @@ pub fn target() -> Target {
         LinkerFlavor::Gcc,
         vec!["-m64".to_string(), "-arch".to_string(), "x86_64".to_string()],
     );
-    base.link_env.extend(super::apple_base::macos_link_env("x86_64"));
     base.link_env_remove.extend(super::apple_base::macos_link_env_remove());
     // don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
     base.stack_probes = StackProbeType::Call;

compiler/rustc_trait_selection/src/traits/project.rs

@@ -20,6 +20,7 @@ use super::{Normalized, NormalizedTy, ProjectionCacheEntry, ProjectionCacheKey};
 use crate::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use crate::infer::{InferCtxt, InferOk, LateBoundRegionConversionTime};
 use crate::traits::error_reporting::InferCtxtExt as _;
+use rustc_data_structures::sso::SsoHashSet;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_errors::ErrorReported;
 use rustc_hir::def_id::DefId;
@@ -944,9 +945,14 @@ fn opt_normalize_projection_type<'a, 'b, 'tcx>(
                 Normalized { value: projected_ty, obligations: projected_obligations }
             };
 
+            let mut deduped: SsoHashSet<_> = Default::default();
             let mut canonical =
                 SelectionContext::with_query_mode(selcx.infcx(), TraitQueryMode::Canonical);
+
             result.obligations.drain_filter(|projected_obligation| {
+                if !deduped.insert(projected_obligation.clone()) {
+                    return true;
+                }
                 // If any global obligations always apply, considering regions, then we don't
                 // need to include them. The `is_global` check rules out inference variables,
                 // so there's no need for the caller of `opt_normalize_projection_type`

compiler/rustc_type_ir/src/lib.rs

@@ -559,6 +559,7 @@ impl<CTX> HashStable<CTX> for FloatTy {
 impl<CTX> HashStable<CTX> for InferTy {
     fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
         use InferTy::*;
+        discriminant(self).hash_stable(ctx, hasher);
         match self {
             TyVar(v) => v.as_u32().hash_stable(ctx, hasher),
             IntVar(v) => v.index.hash_stable(ctx, hasher),

library/core/src/lib.rs

@@ -398,27 +398,4 @@ pub mod arch {
     }
 }
 
-// Pull in the `core_simd` crate directly into libcore. The contents of
-// `core_simd` are in a different repository: rust-lang/portable-simd.
-//
-// `core_simd` depends on libcore, but the contents of this module are
-// set up in such a way that directly pulling it here works such that the
-// crate uses this crate as its libcore.
-#[path = "../../portable-simd/crates/core_simd/src/mod.rs"]
-#[allow(missing_debug_implementations, dead_code, unsafe_op_in_unsafe_fn, unused_unsafe)]
-#[allow(rustdoc::bare_urls)]
-#[unstable(feature = "portable_simd", issue = "86656")]
-#[cfg(not(all(miri, doctest)))] // Miri does not support all SIMD intrinsics
-#[cfg(not(bootstrap))]
-mod core_simd;
-
-#[doc = include_str!("../../portable-simd/crates/core_simd/src/core_simd_docs.md")]
-#[unstable(feature = "portable_simd", issue = "86656")]
-#[cfg(not(all(miri, doctest)))] // Miri does not support all SIMD intrinsics
-#[cfg(not(bootstrap))]
-pub mod simd {
-    #[unstable(feature = "portable_simd", issue = "86656")]
-    pub use crate::core_simd::simd::*;
-}
-
 include!("primitive_docs.rs");

library/core/tests/lib.rs

@@ -61,7 +61,6 @@
 #![feature(never_type)]
 #![feature(unwrap_infallible)]
 #![feature(result_into_ok_or_err)]
-#![cfg_attr(not(bootstrap), feature(portable_simd))]
 #![feature(ptr_metadata)]
 #![feature(once_cell)]
 #![feature(unsized_tuple_coercion)]
@@ -107,8 +106,6 @@ mod pattern;
 mod pin;
 mod ptr;
 mod result;
-#[cfg(not(bootstrap))]
-mod simd;
 mod slice;
 mod str;
 mod str_lossy;

library/std/src/lib.rs

@@ -323,7 +323,6 @@
 #![feature(panic_internals)]
 #![feature(panic_unwind)]
 #![feature(pin_static_ref)]
-#![cfg_attr(not(bootstrap), feature(portable_simd))]
 #![feature(prelude_import)]
 #![feature(ptr_internals)]
 #![feature(rustc_attrs)]
@@ -475,9 +474,6 @@ pub use core::pin;
 pub use core::ptr;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::result;
-#[unstable(feature = "portable_simd", issue = "86656")]
-#[cfg(not(bootstrap))]
-pub use core::simd;
 #[unstable(feature = "async_stream", issue = "79024")]
 pub use core::stream;
 #[stable(feature = "i128", since = "1.26.0")]

library/std/src/process/tests.rs

@@ -4,6 +4,10 @@ use super::{Command, Output, Stdio};
 use crate::io::ErrorKind;
 use crate::str;
 
+fn known_command() -> Command {
+    if cfg!(windows) { Command::new("help") } else { Command::new("echo") }
+}
+
 #[cfg(target_os = "android")]
 fn shell_cmd() -> Command {
     Command::new("/system/bin/sh")
@@ -305,23 +309,23 @@ fn test_interior_nul_in_progname_is_error() {
 
 #[test]
 fn test_interior_nul_in_arg_is_error() {
-    match Command::new("rustc").arg("has-some-\0\0s-inside").spawn() {
+    match known_command().arg("has-some-\0\0s-inside").spawn() {
         Err(e) => assert_eq!(e.kind(), ErrorKind::InvalidInput),
         Ok(_) => panic!(),
     }
 }
 
 #[test]
 fn test_interior_nul_in_args_is_error() {
-    match Command::new("rustc").args(&["has-some-\0\0s-inside"]).spawn() {
+    match known_command().args(&["has-some-\0\0s-inside"]).spawn() {
         Err(e) => assert_eq!(e.kind(), ErrorKind::InvalidInput),
         Ok(_) => panic!(),
     }
 }
 
 #[test]
 fn test_interior_nul_in_current_dir_is_error() {
-    match Command::new("rustc").current_dir("has-some-\0\0s-inside").spawn() {
+    match known_command().current_dir("has-some-\0\0s-inside").spawn() {
         Err(e) => assert_eq!(e.kind(), ErrorKind::InvalidInput),
         Ok(_) => panic!(),
     }
@@ -416,3 +420,22 @@ fn env_empty() {
     let p = Command::new("cmd").args(&["/C", "exit 0"]).env_clear().spawn();
     assert!(p.is_ok());
 }
+
+// See issue #91991
+#[test]
+#[cfg(windows)]
+fn run_bat_script() {
+    let tempdir = crate::sys_common::io::test::tmpdir();
+    let script_path = tempdir.join("hello.cmd");
+
+    crate::fs::write(&script_path, "@echo Hello, %~1!").unwrap();
+    let output = Command::new(&script_path)
+        .arg("fellow Rustaceans")
+        .stdout(crate::process::Stdio::piped())
+        .spawn()
+        .unwrap()
+        .wait_with_output()
+        .unwrap();
+    assert!(output.status.success());
+    assert_eq!(String::from_utf8_lossy(&output.stdout).trim(), "Hello, fellow Rustaceans!");
+}

library/std/src/sys/windows/process.rs

@@ -704,6 +704,19 @@ fn make_command_line(prog: &OsStr, args: &[Arg], force_quotes: bool) -> io::Resu
     // Encode the command and arguments in a command line string such
     // that the spawned process may recover them using CommandLineToArgvW.
     let mut cmd: Vec<u16> = Vec::new();
+
+    // CreateFileW has special handling for .bat and .cmd files, which means we
+    // need to add an extra pair of quotes surrounding the whole command line
+    // so they are properly passed on to the script.
+    // See issue #91991.
+    let is_batch_file = Path::new(prog)
+        .extension()
+        .map(|ext| ext.eq_ignore_ascii_case("cmd") || ext.eq_ignore_ascii_case("bat"))
+        .unwrap_or(false);
+    if is_batch_file {
+        cmd.push(b'"' as u16);
+    }
+
     // Always quote the program name so CreateProcess doesn't interpret args as
     // part of the name if the binary wasn't found first time.
     append_arg(&mut cmd, prog, Quote::Always)?;
@@ -715,6 +728,9 @@ fn make_command_line(prog: &OsStr, args: &[Arg], force_quotes: bool) -> io::Resu
         };
         append_arg(&mut cmd, arg, quote)?;
     }
+    if is_batch_file {
+        cmd.push(b'"' as u16);
+    }
     return Ok(cmd);
 
     fn append_arg(cmd: &mut Vec<u16>, arg: &OsStr, quote: Quote) -> io::Result<()> {

library/std/src/sys/windows/process/tests.rs

@@ -160,6 +160,8 @@ fn windows_exe_resolver() {
         io::ErrorKind::InvalidInput
     );
 
+    /* FIXME: fix and re-enable these tests before making changes to the resolver.
+
     /*
     Some of the following tests may need to be changed if you are deliberately
     changing the behaviour of `resolve_exe`.
@@ -179,4 +181,6 @@ fn windows_exe_resolver() {
     // The application's directory is also searched.
     let current_exe = env::current_exe().unwrap();
     assert!(resolve_exe(current_exe.file_name().unwrap().as_ref(), None).is_ok());
+
+    */
 }

src/librustdoc/html/render/print_item.rs

@@ -296,7 +296,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
             let (short, name) = item_ty_to_strs(myty.unwrap());
             write!(
                 w,
-                "<h2 id=\"{id}\" class=\"section-header\">\
+                "<h2 id=\"{id}\" class=\"small-section-header\">\
                     <a href=\"#{id}\">{name}</a>\
                  </h2>\n{}",
                 ITEM_TABLE_OPEN,

src/librustdoc/html/static/css/themes/ayu.css

@@ -219,7 +219,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,

src/librustdoc/html/static/css/themes/dark.css

@@ -181,7 +181,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,

src/librustdoc/html/static/css/themes/light.css

@@ -176,7 +176,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,