Auto merge of rust-lang#115800 - RalfJung:miri, r=RalfJung

update Miri

r? `@ghost`

src/tools/miri/.github/workflows/ci.yml

@@ -208,7 +208,7 @@ jobs:
           git push -u origin $BRANCH
       - name: Create Pull Request
         run: |
-          PR=$(gh pr create -B master --title 'Automatic sync from rustc' --body '')
+          PR=$(gh pr create -B master --title 'Automatic sync from rustc' --body '' --label subtree-sync)
           ~/.local/bin/zulip-send --user $ZULIP_BOT_EMAIL --api-key $ZULIP_API_TOKEN --site https://rust-lang.zulipchat.com \
             --stream miri --subject "Cron Job Failure (miri, $(date -u +%Y-%m))" \
             --message "A PR doing a rustc-pull [has been automatically created]($PR) for your convenience."

src/tools/miri/miri

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 # Instead of doing just `cargo run --manifest-path .. $@`, we invoke miri-script binary directly. Invoking `cargo run` goes through
 # rustup (that sets it's own environmental variables), which is undesirable.

src/tools/miri/miri-script/src/commands.rs

@@ -102,8 +102,8 @@ impl Command {
         cmd.stdout(process::Stdio::null());
         cmd.stderr(process::Stdio::null());
         let josh = cmd.spawn().context("failed to start josh-proxy, make sure it is installed")?;
-        // Give it some time so hopefully the port is open. (10ms was not enough.)
-        thread::sleep(time::Duration::from_millis(100));
+        // Give it some time so hopefully the port is open. (100ms was not enough.)
+        thread::sleep(time::Duration::from_millis(200));
 
         // Create a wrapper that stops it on drop.
         struct Josh(process::Child);
@@ -338,7 +338,11 @@ impl Command {
         println!(
             "Confirmed that the push round-trips back to Miri properly. Please create a rustc PR:"
         );
-        println!("    https://github.com/{github_user}/rust/pull/new/{branch}");
+        println!(
+            // Open PR with `subtree-sync` label to satisfy the `no-merges` triagebot check
+            // See https://github.com/rust-lang/rust/pull/114157
+            "    https://github.com/rust-lang/rust/compare/{github_user}:{branch}?quick_pull=1&labels=subtree-sync"
+        );
 
         drop(josh);
         Ok(())

src/tools/miri/rust-version

@@ -1 +1 @@
-a989e25f1b87949a886eab3da10324d14189fe95
+366dab13f711df90a6891411458544199d159cbc

src/tools/miri/src/concurrency/data_race.rs

@@ -1030,8 +1030,9 @@ trait EvalContextPrivExt<'mir, 'tcx: 'mir>: MiriInterpCxExt<'mir, 'tcx> {
         // <https://github.com/rust-lang/miri/pull/2464#discussion_r939636130> for details.
         // We avoid `get_ptr_alloc` since we do *not* want to run the access hooks -- the actual
         // access will happen later.
-        let (alloc_id, _offset, _prov) =
-            this.ptr_try_get_alloc_id(place.ptr()).expect("there are no zero-sized atomic accesses");
+        let (alloc_id, _offset, _prov) = this
+            .ptr_try_get_alloc_id(place.ptr())
+            .expect("there are no zero-sized atomic accesses");
         if this.get_alloc_mutability(alloc_id)? == Mutability::Not {
             // FIXME: make this prettier, once these messages have separate title/span/help messages.
             throw_ub_format!(

src/tools/miri/src/concurrency/thread.rs

@@ -7,8 +7,8 @@ use std::sync::atomic::{AtomicBool, Ordering::Relaxed};
 use std::task::Poll;
 use std::time::{Duration, SystemTime};
 
-use log::trace;
 use either::Either;
+use log::trace;
 
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def_id::DefId;

src/tools/miri/src/shims/foreign_items.rs

@@ -1037,6 +1037,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                     this, link_name, abi, args, dest,
                 );
             }
+            name if name.starts_with("llvm.x86.sse2.") => {
+                return shims::x86::sse2::EvalContextExt::emulate_x86_sse2_intrinsic(
+                    this, link_name, abi, args, dest,
+                );
+            }
 
             // Platform-specific shims
             _ =>

src/tools/miri/src/shims/os_str.rs

@@ -159,8 +159,9 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
 
         let arg_type = Ty::new_array(this.tcx.tcx, this.tcx.types.u16, size);
         let arg_place = this.allocate(this.layout_of(arg_type).unwrap(), memkind)?;
-        let (written, _) =
-            self.write_os_str_to_wide_str(os_str, arg_place.ptr(), size, /*truncate*/ false).unwrap();
+        let (written, _) = self
+            .write_os_str_to_wide_str(os_str, arg_place.ptr(), size, /*truncate*/ false)
+            .unwrap();
         assert!(written);
         Ok(arg_place.ptr())
     }

src/tools/miri/src/shims/unix/macos/foreign_items.rs

@@ -112,17 +112,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             // Access to command-line arguments
             "_NSGetArgc" => {
                 let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                this.write_pointer(
-                    this.machine.argc.expect("machine must be initialized"),
-                    dest,
-                )?;
+                this.write_pointer(this.machine.argc.expect("machine must be initialized"), dest)?;
             }
             "_NSGetArgv" => {
                 let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                this.write_pointer(
-                    this.machine.argv.expect("machine must be initialized"),
-                    dest,
-                )?;
+                this.write_pointer(this.machine.argv.expect("machine must be initialized"), dest)?;
             }
             "_NSGetExecutablePath" => {
                 let [buf, bufsize] =

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

@@ -1 +1,45 @@
+use crate::InterpResult;
+
 pub(super) mod sse;
+pub(super) mod sse2;
+
+/// Floating point comparison operation
+///
+/// <https://www.felixcloutier.com/x86/cmpss>
+/// <https://www.felixcloutier.com/x86/cmpps>
+/// <https://www.felixcloutier.com/x86/cmpsd>
+/// <https://www.felixcloutier.com/x86/cmppd>
+#[derive(Copy, Clone)]
+enum FloatCmpOp {
+    Eq,
+    Lt,
+    Le,
+    Unord,
+    Neq,
+    /// Not less-than
+    Nlt,
+    /// Not less-or-equal
+    Nle,
+    /// Ordered, i.e. neither of them is NaN
+    Ord,
+}
+
+impl FloatCmpOp {
+    /// Convert from the `imm` argument used to specify the comparison
+    /// operation in intrinsics such as `llvm.x86.sse.cmp.ss`.
+    fn from_intrinsic_imm(imm: i8, intrinsic: &str) -> InterpResult<'_, Self> {
+        match imm {
+            0 => Ok(Self::Eq),
+            1 => Ok(Self::Lt),
+            2 => Ok(Self::Le),
+            3 => Ok(Self::Unord),
+            4 => Ok(Self::Neq),
+            5 => Ok(Self::Nlt),
+            6 => Ok(Self::Nle),
+            7 => Ok(Self::Ord),
+            imm => {
+                throw_unsup_format!("invalid `imm` parameter of {intrinsic}: {imm}");
+            }
+        }
+    }
+}

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

@@ -5,6 +5,7 @@ use rustc_target::spec::abi::Abi;
 
 use rand::Rng as _;
 
+use super::FloatCmpOp;
 use crate::*;
 use shims::foreign_items::EmulateByNameResult;
 
@@ -78,7 +79,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
 
                 unary_op_ss(this, which, op, dest)?;
             }
-            // Used to implement _mm_{sqrt,rcp,rsqrt}_ss functions.
+            // Used to implement _mm_{sqrt,rcp,rsqrt}_ps functions.
             // Performs the operations on all components of `op`.
             "sqrt.ps" | "rcp.ps" | "rsqrt.ps" => {
                 let [op] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
@@ -100,22 +101,10 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [left, right, imm] =
                     this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
 
-                let which = match this.read_scalar(imm)?.to_i8()? {
-                    0 => FloatBinOp::Cmp(FloatCmpOp::Eq),
-                    1 => FloatBinOp::Cmp(FloatCmpOp::Lt),
-                    2 => FloatBinOp::Cmp(FloatCmpOp::Le),
-                    3 => FloatBinOp::Cmp(FloatCmpOp::Unord),
-                    4 => FloatBinOp::Cmp(FloatCmpOp::Neq),
-                    5 => FloatBinOp::Cmp(FloatCmpOp::Nlt),
-                    6 => FloatBinOp::Cmp(FloatCmpOp::Nle),
-                    7 => FloatBinOp::Cmp(FloatCmpOp::Ord),
-                    imm => {
-                        throw_unsup_format!(
-                            "invalid 3rd parameter of llvm.x86.sse.cmp.ps: {}",
-                            imm
-                        );
-                    }
-                };
+                let which = FloatBinOp::Cmp(FloatCmpOp::from_intrinsic_imm(
+                    this.read_scalar(imm)?.to_i8()?,
+                    "llvm.x86.sse.cmp.ss",
+                )?);
 
                 bin_op_ss(this, which, left, right, dest)?;
             }
@@ -127,26 +116,14 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let [left, right, imm] =
                     this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
 
-                let which = match this.read_scalar(imm)?.to_i8()? {
-                    0 => FloatBinOp::Cmp(FloatCmpOp::Eq),
-                    1 => FloatBinOp::Cmp(FloatCmpOp::Lt),
-                    2 => FloatBinOp::Cmp(FloatCmpOp::Le),
-                    3 => FloatBinOp::Cmp(FloatCmpOp::Unord),
-                    4 => FloatBinOp::Cmp(FloatCmpOp::Neq),
-                    5 => FloatBinOp::Cmp(FloatCmpOp::Nlt),
-                    6 => FloatBinOp::Cmp(FloatCmpOp::Nle),
-                    7 => FloatBinOp::Cmp(FloatCmpOp::Ord),
-                    imm => {
-                        throw_unsup_format!(
-                            "invalid 3rd parameter of llvm.x86.sse.cmp.ps: {}",
-                            imm
-                        );
-                    }
-                };
+                let which = FloatBinOp::Cmp(FloatCmpOp::from_intrinsic_imm(
+                    this.read_scalar(imm)?.to_i8()?,
+                    "llvm.x86.sse.cmp.ps",
+                )?);
 
                 bin_op_ps(this, which, left, right, dest)?;
             }
-            // Used to implement _mm_{,u}comi{eq,lt,le,gt,ge,neq}_ps functions.
+            // Used to implement _mm_{,u}comi{eq,lt,le,gt,ge,neq}_ss functions.
             // Compares the first component of `left` and `right` and returns
             // a scalar value (0 or 1).
             "comieq.ss" | "comilt.ss" | "comile.ss" | "comigt.ss" | "comige.ss" | "comineq.ss"
@@ -292,6 +269,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                     let op = this.read_scalar(&this.project_index(&op, i)?)?;
                     let op = op.to_u32()?;
 
+                    // Extract the highest bit of `op` and place it in the `i`-th bit of `res`
                     res |= (op >> 31) << i;
                 }
 
@@ -303,25 +281,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     }
 }
 
-/// Floating point comparison operation
-///
-/// <https://www.felixcloutier.com/x86/cmpss>
-/// <https://www.felixcloutier.com/x86/cmpps>
-#[derive(Copy, Clone)]
-enum FloatCmpOp {
-    Eq,
-    Lt,
-    Le,
-    Unord,
-    Neq,
-    /// Not less-than
-    Nlt,
-    /// Not less-or-equal
-    Nle,
-    /// Ordered, i.e. neither of them is NaN
-    Ord,
-}
-
 #[derive(Copy, Clone)]
 enum FloatBinOp {
     /// Arithmetic operation
@@ -436,8 +395,8 @@ fn bin_op_ss<'tcx>(
     Ok(())
 }
 
-/// Performs `which` operation on each component of `left`, and
-/// `right` storing the result is stored in `dest`.
+/// Performs `which` operation on each component of `left` and
+/// `right`, storing the result is stored in `dest`.
 fn bin_op_ps<'tcx>(
     this: &mut crate::MiriInterpCx<'_, 'tcx>,
     which: FloatBinOp,