Auto merge of rust-lang#123897 - matthiaskrgr:rollup-v0vvcw2, r=matth…

…iaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#123530 (Enable building tier2 target riscv32im-unknown-none-elf)
 - rust-lang#123642 (do not allow using local llvm while using rustc from ci)
 - rust-lang#123716 (Update documentation of Path::to_path_buf and Path::ancestors)
 - rust-lang#123876 (Update backtrace submodule)
 - rust-lang#123888 (Replace a `DefiningOpaqueTypes::No` with `Yes` by asserting that one side of the comparison is a type variable.)
 - rust-lang#123890 (removed (mostly) unused code)
 - rust-lang#123891 (Miri subtree update)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_hir_analysis/src/check/check.rs

@@ -505,7 +505,6 @@ fn check_static_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 }
 
 pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
-    let _indenter = indenter();
     match tcx.def_kind(def_id) {
         DefKind::Static { .. } => {
             tcx.ensure().typeck(def_id);

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -103,7 +103,6 @@ use rustc_trait_selection::traits::ObligationCtxt;
 
 use crate::errors;
 use crate::require_c_abi_if_c_variadic;
-use crate::util::common::indenter;
 
 use self::compare_impl_item::collect_return_position_impl_trait_in_trait_tys;
 use self::region::region_scope_tree;

compiler/rustc_hir_analysis/src/lib.rs

@@ -103,7 +103,6 @@ use rustc_middle::middle;
 use rustc_middle::mir::interpret::GlobalId;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, Ty, TyCtxt};
-use rustc_middle::util;
 use rustc_session::parse::feature_err;
 use rustc_span::{symbol::sym, Span};
 use rustc_target::spec::abi::Abi;

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -561,9 +561,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
             // Unify `interior` with `witness` and collect all the resulting obligations.
             let span = self.tcx.hir().body(body_id).value.span;
+            let ty::Infer(ty::InferTy::TyVar(_)) = interior.kind() else {
+                span_bug!(span, "coroutine interior witness not infer: {:?}", interior.kind())
+            };
             let ok = self
                 .at(&self.misc(span), self.param_env)
-                .eq(DefineOpaqueTypes::No, interior, witness)
+                // Will never define opaque types, as all we do is instantiate a type variable.
+                .eq(DefineOpaqueTypes::Yes, interior, witness)
                 .expect("Failed to unify coroutine interior type");
             let mut obligations = ok.obligations;
 

compiler/rustc_middle/src/util/common.rs

@@ -1,8 +1,3 @@
-use rustc_data_structures::sync::Lock;
-
-use std::fmt::Debug;
-use std::time::{Duration, Instant};
-
 #[cfg(test)]
 mod tests;
 
@@ -26,46 +21,6 @@ pub fn to_readable_str(mut val: usize) -> String {
     groups.join("_")
 }
 
-pub fn record_time<T, F>(accu: &Lock<Duration>, f: F) -> T
-where
-    F: FnOnce() -> T,
-{
-    let start = Instant::now();
-    let rv = f();
-    let duration = start.elapsed();
-    let mut accu = accu.lock();
-    *accu += duration;
-    rv
-}
-
-pub fn indent<R, F>(op: F) -> R
-where
-    R: Debug,
-    F: FnOnce() -> R,
-{
-    // Use in conjunction with the log post-processor like `src/etc/indenter`
-    // to make debug output more readable.
-    debug!(">>");
-    let r = op();
-    debug!("<< (Result = {:?})", r);
-    r
-}
-
-pub struct Indenter {
-    _cannot_construct_outside_of_this_module: (),
-}
-
-impl Drop for Indenter {
-    fn drop(&mut self) {
-        debug!("<<");
-    }
-}
-
-pub fn indenter() -> Indenter {
-    debug!(">>");
-    Indenter { _cannot_construct_outside_of_this_module: () }
-}
-
 // const wrapper for `if let Some((_, tail)) = name.rsplit_once(':') { tail } else { name }`
 pub const fn c_name(name: &'static str) -> &'static str {
     // FIXME Simplify the implementation once more `str` methods get const-stable.

compiler/rustc_type_ir/src/ty_kind.rs

@@ -181,9 +181,9 @@ pub enum TyKind<I: Interner> {
     /// Looking at the following example, the witness for this coroutine
     /// may end up as something like `for<'a> [Vec<i32>, &'a Vec<i32>]`:
     ///
-    /// ```ignore UNSOLVED (ask @compiler-errors, should this error? can we just swap the yields?)
+    /// ```
     /// #![feature(coroutines)]
-    /// |a| {
+    /// static |a| {
     ///     let x = &vec![3];
     ///     yield a;
     ///     yield x[0];

config.example.toml

@@ -50,7 +50,7 @@
 #
 # Note that many of the LLVM options are not currently supported for
 # downloading. Currently only the "assertions" option can be toggled.
-#download-ci-llvm = if rust.channel == "dev" { "if-unchanged" } else { false }
+#download-ci-llvm = if rust.channel == "dev" || rust.download-rustc != false { "if-unchanged" } else { false }
 
 # Indicates whether the LLVM build is a Release or Debug build
 #optimize = true

library/std/src/path.rs

@@ -2143,10 +2143,10 @@ impl Path {
     /// # Examples
     ///
     /// ```
-    /// use std::path::Path;
+    /// use std::path::{Path, PathBuf};
     ///
     /// let path_buf = Path::new("foo.txt").to_path_buf();
-    /// assert_eq!(path_buf, std::path::PathBuf::from("foo.txt"));
+    /// assert_eq!(path_buf, PathBuf::from("foo.txt"));
     /// ```
     #[rustc_conversion_suggestion]
     #[must_use = "this returns the result of the operation, \
@@ -2278,10 +2278,9 @@ impl Path {
     /// Produces an iterator over `Path` and its ancestors.
     ///
     /// The iterator will yield the `Path` that is returned if the [`parent`] method is used zero
-    /// or more times. That means, the iterator will yield `&self`, `&self.parent().unwrap()`,
-    /// `&self.parent().unwrap().parent().unwrap()` and so on. If the [`parent`] method returns
-    /// [`None`], the iterator will do likewise. The iterator will always yield at least one value,
-    /// namely `&self`.
+    /// or more times. If the [`parent`] method returns [`None`], the iterator will do likewise.
+    /// The iterator will always yield at least one value, namely `Some(&self)`. Next it will yield
+    /// `&self.parent()`, `&self.parent().and_then(Path::parent)` and so on.
     ///
     /// # Examples
     ///

src/bootstrap/src/core/config/config.rs

@@ -2483,9 +2483,20 @@ impl Config {
                 llvm::is_ci_llvm_available(self, asserts)
             }
         };
+
         match download_ci_llvm {
-            None => self.channel == "dev" && if_unchanged(),
-            Some(StringOrBool::Bool(b)) => b,
+            None => {
+                (self.channel == "dev" || self.download_rustc_commit.is_some()) && if_unchanged()
+            }
+            Some(StringOrBool::Bool(b)) => {
+                if !b && self.download_rustc_commit.is_some() {
+                    panic!(
+                        "`llvm.download-ci-llvm` cannot be set to `false` if `rust.download-rustc` is set to `true` or `if-unchanged`."
+                    );
+                }
+
+                b
+            }
             // FIXME: "if-available" is deprecated. Remove this block later (around mid 2024)
             // to not break builds between the recent-to-old checkouts.
             Some(StringOrBool::String(s)) if s == "if-available" => {

src/ci/docker/host-x86_64/dist-various-1/Dockerfile

@@ -99,6 +99,7 @@ ENV TARGETS=$TARGETS,thumbv8m.base-none-eabi
 ENV TARGETS=$TARGETS,thumbv8m.main-none-eabi
 ENV TARGETS=$TARGETS,thumbv8m.main-none-eabihf
 ENV TARGETS=$TARGETS,riscv32i-unknown-none-elf
+ENV TARGETS=$TARGETS,riscv32im-unknown-none-elf
 ENV TARGETS=$TARGETS,riscv32imc-unknown-none-elf
 ENV TARGETS=$TARGETS,riscv32imac-unknown-none-elf
 ENV TARGETS=$TARGETS,riscv32imafc-unknown-none-elf
@@ -130,6 +131,8 @@ ENV CFLAGS_armv5te_unknown_linux_musleabi="-march=armv5te -marm -mfloat-abi=soft
     CFLAGS_aarch64_unknown_none=-mstrict-align -march=armv8-a+fp+simd \
     CC_riscv32i_unknown_none_elf=riscv32-unknown-elf-gcc \
     CFLAGS_riscv32i_unknown_none_elf=-march=rv32i -mabi=ilp32 \
+    CC_riscv32im_unknown_none_elf=riscv32-unknown-elf-gcc \
+    CFLAGS_riscv32im_unknown_none_elf=-march=rv32im -mabi=ilp32 \
     CC_riscv32imc_unknown_none_elf=riscv32-unknown-elf-gcc \
     CFLAGS_riscv32imc_unknown_none_elf=-march=rv32imc -mabi=ilp32 \
     CC_riscv32imac_unknown_none_elf=riscv32-unknown-elf-gcc \

src/tools/miri/cargo-miri/src/phases.rs

@@ -454,15 +454,10 @@ pub fn phase_rustc(mut args: impl Iterator<Item = String>, phase: RustcPhase) {
                 continue;
             }
             // If the REPLACE_LIBRS hack is enabled and we are building a `lib.rs` file, and a
-            // `lib.miri.rs` file exists, then build that instead. We only consider relative paths
-            // as cargo uses those for files in the workspace; dependencies from crates.io get
-            // absolute paths.
+            // `lib.miri.rs` file exists, then build that instead.
             if replace_librs {
                 let path = Path::new(&arg);
-                if path.is_relative()
-                    && path.file_name().is_some_and(|f| f == "lib.rs")
-                    && path.is_file()
-                {
+                if path.file_name().is_some_and(|f| f == "lib.rs") && path.is_file() {
                     let miri_rs = Path::new(&arg).with_extension("miri.rs");
                     if miri_rs.is_file() {
                         if verbose > 0 {

src/tools/miri/src/shims/x86/mod.rs

@@ -468,6 +468,86 @@ fn unary_op_ps<'tcx>(
     Ok(())
 }
 
+enum ShiftOp {
+    /// Shift left, logically (shift in zeros) -- same as shift left, arithmetically
+    Left,
+    /// Shift right, logically (shift in zeros)
+    RightLogic,
+    /// Shift right, arithmetically (shift in sign)
+    RightArith,
+}
+
+/// Shifts each element of `left` by a scalar amount. The shift amount
+/// is determined by the lowest 64 bits of `right` (which is a 128-bit vector).
+///
+/// For logic shifts, when right is larger than BITS - 1, zero is produced.
+/// For arithmetic right-shifts, when right is larger than BITS - 1, the sign
+/// bit is copied to remaining bits.
+fn shift_simd_by_scalar<'tcx>(
+    this: &mut crate::MiriInterpCx<'_, 'tcx>,
+    left: &OpTy<'tcx, Provenance>,
+    right: &OpTy<'tcx, Provenance>,
+    which: ShiftOp,
+    dest: &MPlaceTy<'tcx, Provenance>,
+) -> InterpResult<'tcx, ()> {
+    let (left, left_len) = this.operand_to_simd(left)?;
+    let (dest, dest_len) = this.mplace_to_simd(dest)?;
+
+    assert_eq!(dest_len, left_len);
+    // `right` may have a different length, and we only care about its
+    // lowest 64bit anyway.
+
+    // Get the 64-bit shift operand and convert it to the type expected
+    // by checked_{shl,shr} (u32).
+    // It is ok to saturate the value to u32::MAX because any value
+    // above BITS - 1 will produce the same result.
+    let shift = u32::try_from(extract_first_u64(this, right)?).unwrap_or(u32::MAX);
+
+    for i in 0..dest_len {
+        let left = this.read_scalar(&this.project_index(&left, i)?)?;
+        let dest = this.project_index(&dest, i)?;
+
+        let res = match which {
+            ShiftOp::Left => {
+                let left = left.to_uint(dest.layout.size)?;
+                let res = left.checked_shl(shift).unwrap_or(0);
+                // `truncate` is needed as left-shift can make the absolute value larger.
+                Scalar::from_uint(dest.layout.size.truncate(res), dest.layout.size)
+            }
+            ShiftOp::RightLogic => {
+                let left = left.to_uint(dest.layout.size)?;
+                let res = left.checked_shr(shift).unwrap_or(0);
+                // No `truncate` needed as right-shift can only make the absolute value smaller.
+                Scalar::from_uint(res, dest.layout.size)
+            }
+            ShiftOp::RightArith => {
+                let left = left.to_int(dest.layout.size)?;
+                // On overflow, copy the sign bit to the remaining bits
+                let res = left.checked_shr(shift).unwrap_or(left >> 127);
+                // No `truncate` needed as right-shift can only make the absolute value smaller.
+                Scalar::from_int(res, dest.layout.size)
+            }
+        };
+        this.write_scalar(res, &dest)?;
+    }
+
+    Ok(())
+}
+
+/// Takes a 128-bit vector, transmutes it to `[u64; 2]` and extracts
+/// the first value.
+fn extract_first_u64<'tcx>(
+    this: &crate::MiriInterpCx<'_, 'tcx>,
+    op: &OpTy<'tcx, Provenance>,
+) -> InterpResult<'tcx, u64> {
+    // Transmute vector to `[u64; 2]`
+    let array_layout = this.layout_of(Ty::new_array(this.tcx.tcx, this.tcx.types.u64, 2))?;
+    let op = op.transmute(array_layout, this)?;
+
+    // Get the first u64 from the array
+    this.read_scalar(&this.project_index(&op, 0)?)?.to_u64()
+}
+
 // Rounds the first element of `right` according to `rounding`
 // and copies the remaining elements from `left`.
 fn round_first<'tcx, F: rustc_apfloat::Float>(