Miri subtree update

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

@@ -1,11 +1,7 @@
 name: CI
 
 on:
-  push:
-    # Run in PRs and for bors, but not on master.
-    branches:
-      - 'auto'
-      - 'try'
+  merge_group:
   pull_request:
     branches:
       - 'master'
@@ -38,7 +34,7 @@ jobs:
       # The `style` job only runs on Linux; this makes sure the Windows-host-specific
       # code is also covered by clippy.
       - name: Check clippy
-        if: matrix.os == 'windows-latest'
+        if: ${{ matrix.os == 'windows-latest' }}
         run: ./miri clippy -- -D warnings
 
       - name: Test Miri
@@ -62,27 +58,25 @@ jobs:
       - name: rustdoc
         run: RUSTDOCFLAGS="-Dwarnings" ./miri doc --document-private-items
 
-  # These jobs doesn't actually test anything, but they're only used to tell
-  # bors the build completed, as there is no practical way to detect when a
-  # workflow is successful listening to webhooks only.
-  #
+  # Summary job for the merge queue.
   # ALL THE PREVIOUS JOBS NEED TO BE ADDED TO THE `needs` SECTION OF THIS JOB!
-  end-success:
-    name: bors build finished
-    runs-on: ubuntu-latest
+  # And they should be added below in `cron-fail-notify` as well.
+  conclusion:
     needs: [build, style]
-    if: github.event.pusher.name == 'bors' && success()
-    steps:
-      - name: mark the job as a success
-        run: exit 0
-  end-failure:
-    name: bors build finished
+    # We need to ensure this job does *not* get skipped if its dependencies fail,
+    # because a skipped job is considered a success by GitHub. So we have to
+    # overwrite `if:`. We use `!cancelled()` to ensure the job does still not get run
+    # when the workflow is canceled manually.
+    if: ${{ !cancelled() }}
     runs-on: ubuntu-latest
-    needs: [build, style]
-    if: github.event.pusher.name == 'bors' && (failure() || cancelled())
     steps:
-      - name: mark the job as a failure
-        run: exit 1
+      # Manually check the status of all dependencies. `if: failure()` does not work.
+      - name: Conclusion
+        run: |
+            # Print the dependent jobs to see them in the CI log
+            jq -C <<< '${{ toJson(needs) }}'
+            # Check if all jobs that we depend on (in the needs array) were successful.
+            jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
 
   cron-fail-notify:
     name: cronjob failure notification
@@ -93,7 +87,7 @@ jobs:
         # ... and create a PR.
         pull-requests: write
     needs: [build, style]
-    if: github.event_name == 'schedule' && failure()
+    if: ${{ github.event_name == 'schedule' && failure() }}
     steps:
       # Send a Zulip notification
       - name: Install zulip-send
@@ -145,7 +139,7 @@ jobs:
           git push -u origin $BRANCH
       - name: Create Pull Request
         run: |
-          PR=$(gh pr create -B master --title 'Automatic Rustup' --body '')
+          PR=$(gh pr create -B master --title 'Automatic Rustup' --body 'Please close and re-open this PR to trigger CI, then enable auto-merge.')
           ~/.local/bin/zulip-send --user $ZULIP_BOT_EMAIL --api-key $ZULIP_API_TOKEN --site https://rust-lang.zulipchat.com \
             --stream miri --subject "Miri Build Failure ($(date -u +%Y-%m))" \
             --message "A PR doing a rustc-pull [has been automatically created]($PR) for your convenience."

src/tools/miri/ci/ci.sh

@@ -154,7 +154,7 @@ case $HOST_TARGET in
     TEST_TARGET=i686-unknown-freebsd   run_tests_minimal $BASIC $UNIX time hashmap random threadname pthread fs libc-pipe
     TEST_TARGET=x86_64-unknown-illumos run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe
     TEST_TARGET=x86_64-pc-solaris      run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe
-    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap pthread --skip threadname
+    TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap threadname pthread
     TEST_TARGET=wasm32-wasip2          run_tests_minimal $BASIC wasm
     TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std empty_main wasm # this target doesn't really have std
     TEST_TARGET=thumbv7em-none-eabihf  run_tests_minimal no_std

src/tools/miri/rust-version

@@ -1 +1 @@
-17a19e684cdf3ca088af8b4da6a6209d128913f4
+814df6e50eaf89b90793e7d9618bb60f1f18377a

src/tools/miri/src/borrow_tracker/stacked_borrows/diagnostics.rs

@@ -424,7 +424,11 @@ impl<'history, 'ecx, 'tcx> DiagnosticCx<'history, 'ecx, 'tcx> {
     }
 
     #[inline(never)] // This is only called on fatal code paths
-    pub(super) fn protector_error(&self, item: &Item, kind: ProtectorKind) -> InterpErrorKind<'tcx> {
+    pub(super) fn protector_error(
+        &self,
+        item: &Item,
+        kind: ProtectorKind,
+    ) -> InterpErrorKind<'tcx> {
         let protected = match kind {
             ProtectorKind::WeakProtector => "weakly protected",
             ProtectorKind::StrongProtector => "strongly protected",

src/tools/miri/src/intrinsics/mod.rs

@@ -145,6 +145,21 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(Scalar::from_bool(branch), dest)?;
             }
 
+            "floorf16" | "ceilf16" | "truncf16" | "roundf16" | "rintf16" => {
+                let [f] = check_arg_count(args)?;
+                let f = this.read_scalar(f)?.to_f16()?;
+                let mode = match intrinsic_name {
+                    "floorf16" => Round::TowardNegative,
+                    "ceilf16" => Round::TowardPositive,
+                    "truncf16" => Round::TowardZero,
+                    "roundf16" => Round::NearestTiesToAway,
+                    "rintf16" => Round::NearestTiesToEven,
+                    _ => bug!(),
+                };
+                let res = f.round_to_integral(mode).value;
+                let res = this.adjust_nan(res, &[f]);
+                this.write_scalar(res, dest)?;
+            }
             "floorf32" | "ceilf32" | "truncf32" | "roundf32" | "rintf32" => {
                 let [f] = check_arg_count(args)?;
                 let f = this.read_scalar(f)?.to_f32()?;
@@ -175,6 +190,21 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let res = this.adjust_nan(res, &[f]);
                 this.write_scalar(res, dest)?;
             }
+            "floorf128" | "ceilf128" | "truncf128" | "roundf128" | "rintf128" => {
+                let [f] = check_arg_count(args)?;
+                let f = this.read_scalar(f)?.to_f128()?;
+                let mode = match intrinsic_name {
+                    "floorf128" => Round::TowardNegative,
+                    "ceilf128" => Round::TowardPositive,
+                    "truncf128" => Round::TowardZero,
+                    "roundf128" => Round::NearestTiesToAway,
+                    "rintf128" => Round::NearestTiesToEven,
+                    _ => bug!(),
+                };
+                let res = f.round_to_integral(mode).value;
+                let res = this.adjust_nan(res, &[f]);
+                this.write_scalar(res, dest)?;
+            }
 
             #[rustfmt::skip]
             | "sinf32"

src/tools/miri/src/intrinsics/simd.rs

@@ -1,7 +1,8 @@
 use either::Either;
 use rustc_apfloat::{Float, Round};
+use rustc_middle::ty::FloatTy;
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::{mir, ty, ty::FloatTy};
+use rustc_middle::{mir, ty};
 use rustc_span::{Symbol, sym};
 use rustc_target::abi::{Endian, HasDataLayout};
 
@@ -630,12 +631,8 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let (right, right_len) = this.project_to_simd(right)?;
                 let (dest, dest_len) = this.project_to_simd(dest)?;
 
-                let index = generic_args[2]
-                    .expect_const()
-                    .try_to_valtree()
-                    .unwrap()
-                    .0
-                    .unwrap_branch();
+                let index =
+                    generic_args[2].expect_const().try_to_valtree().unwrap().0.unwrap_branch();
                 let index_len = index.len();
 
                 assert_eq!(left_len, right_len);

src/tools/miri/src/lib.rs

@@ -147,7 +147,7 @@ pub use crate::range_map::RangeMap;
 pub use crate::shims::EmulateItemResult;
 pub use crate::shims::env::{EnvVars, EvalContextExt as _};
 pub use crate::shims::foreign_items::{DynSym, EvalContextExt as _};
-pub use crate::shims::io_error::{EvalContextExt as _, LibcError};
+pub use crate::shims::io_error::{EvalContextExt as _, IoError, LibcError};
 pub use crate::shims::os_str::EvalContextExt as _;
 pub use crate::shims::panic::{CatchUnwindData, EvalContextExt as _};
 pub use crate::shims::time::EvalContextExt as _;

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

@@ -447,8 +447,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 } else {
                     // If this does not fit in an isize, return null and, on Unix, set errno.
                     if this.target_os_is_unix() {
-                        let einval = this.eval_libc("ENOMEM");
-                        this.set_last_error(einval)?;
+                        this.set_last_error(LibcError("ENOMEM"))?;
                     }
                     this.write_null(dest)?;
                 }
@@ -464,8 +463,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 } else {
                     // On size overflow, return null and, on Unix, set errno.
                     if this.target_os_is_unix() {
-                        let einval = this.eval_libc("ENOMEM");
-                        this.set_last_error(einval)?;
+                        this.set_last_error(LibcError("ENOMEM"))?;
                     }
                     this.write_null(dest)?;
                 }
@@ -486,8 +484,7 @@ trait EvalContextExtPriv<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 } else {
                     // If this does not fit in an isize, return null and, on Unix, set errno.
                     if this.target_os_is_unix() {
-                        let einval = this.eval_libc("ENOMEM");
-                        this.set_last_error(einval)?;
+                        this.set_last_error(LibcError("ENOMEM"))?;
                     }
                     this.write_null(dest)?;
                 }

src/tools/miri/src/shims/io_error.rs

@@ -141,6 +141,16 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         interp_ok(Scalar::from_i32(-1))
     }
 
+    /// Sets the last OS error and return `-1` as a `i64`-typed Scalar
+    fn set_last_error_and_return_i64(
+        &mut self,
+        err: impl Into<IoError>,
+    ) -> InterpResult<'tcx, Scalar> {
+        let this = self.eval_context_mut();
+        this.set_last_error(err)?;
+        interp_ok(Scalar::from_i64(-1))
+    }
+
     /// Gets the last error variable.
     fn get_last_error(&mut self) -> InterpResult<'tcx, Scalar> {
         let this = self.eval_context_mut();

src/tools/miri/src/shims/time.rs

@@ -81,9 +81,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         } else if relative_clocks.contains(&clk_id) {
             this.machine.clock.now().duration_since(this.machine.clock.epoch())
         } else {
-            let einval = this.eval_libc("EINVAL");
-            this.set_last_error(einval)?;
-            return interp_ok(Scalar::from_i32(-1));
+            return this.set_last_error_and_return_i32(LibcError("EINVAL"));
         };
 
         let tv_sec = duration.as_secs();
@@ -109,9 +107,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         // Using tz is obsolete and should always be null
         let tz = this.read_pointer(tz_op)?;
         if !this.ptr_is_null(tz)? {
-            let einval = this.eval_libc("EINVAL");
-            this.set_last_error(einval)?;
-            return interp_ok(Scalar::from_i32(-1));
+            return this.set_last_error_and_return_i32(LibcError("EINVAL"));
         }
 
         let duration = system_time_to_duration(&SystemTime::now())?;
@@ -323,9 +319,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         let duration = match this.read_timespec(&req)? {
             Some(duration) => duration,
             None => {
-                let einval = this.eval_libc("EINVAL");
-                this.set_last_error(einval)?;
-                return interp_ok(Scalar::from_i32(-1));
+                return this.set_last_error_and_return_i32(LibcError("EINVAL"));
             }
         };
 

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

@@ -1,6 +1,7 @@
 use rustc_span::Symbol;
 use rustc_target::spec::abi::Abi;
 
+use crate::shims::unix::android::thread::prctl;
 use crate::*;
 
 pub fn is_dyn_sym(_name: &str) -> bool {
@@ -25,6 +26,9 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(errno_place.to_ref(this).to_scalar(), dest)?;
             }
 
+            // Threading
+            "prctl" => prctl(this, link_name, abi, args, dest)?,
+
             _ => return interp_ok(EmulateItemResult::NotSupported),
         }
         interp_ok(EmulateItemResult::NeedsReturn)

src/tools/miri/src/shims/unix/android/mod.rs

@@ -1 +1,2 @@
 pub mod foreign_items;
+pub mod thread;

src/tools/miri/src/shims/unix/android/thread.rs

@@ -0,0 +1,57 @@
+use rustc_span::Symbol;
+use rustc_target::abi::Size;
+use rustc_target::spec::abi::Abi;
+
+use crate::helpers::check_min_arg_count;
+use crate::shims::unix::thread::EvalContextExt as _;
+use crate::*;
+
+const TASK_COMM_LEN: usize = 16;
+
+pub fn prctl<'tcx>(
+    this: &mut MiriInterpCx<'tcx>,
+    link_name: Symbol,
+    abi: Abi,
+    args: &[OpTy<'tcx>],
+    dest: &MPlaceTy<'tcx>,
+) -> InterpResult<'tcx> {
+    // We do not use `check_shim` here because `prctl` is variadic. The argument
+    // count is checked bellow.
+    this.check_abi_and_shim_symbol_clash(abi, Abi::C { unwind: false }, link_name)?;
+
+    // FIXME: Use constants once https://github.com/rust-lang/libc/pull/3941 backported to the 0.2 branch.
+    let pr_set_name = 15;
+    let pr_get_name = 16;
+
+    let [op] = check_min_arg_count("prctl", args)?;
+    let res = match this.read_scalar(op)?.to_i32()? {
+        op if op == pr_set_name => {
+            let [_, name] = check_min_arg_count("prctl(PR_SET_NAME, ...)", args)?;
+            let name = this.read_scalar(name)?;
+            let thread = this.pthread_self()?;
+            // The Linux kernel silently truncates long names.
+            // https://www.man7.org/linux/man-pages/man2/PR_SET_NAME.2const.html
+            let res =
+                this.pthread_setname_np(thread, name, TASK_COMM_LEN, /* truncate */ true)?;
+            assert!(res);
+            Scalar::from_u32(0)
+        }
+        op if op == pr_get_name => {
+            let [_, name] = check_min_arg_count("prctl(PR_GET_NAME, ...)", args)?;
+            let name = this.read_scalar(name)?;
+            let thread = this.pthread_self()?;
+            let len = Scalar::from_target_usize(TASK_COMM_LEN as u64, this);
+            this.check_ptr_access(
+                name.to_pointer(this)?,
+                Size::from_bytes(TASK_COMM_LEN),
+                CheckInAllocMsg::MemoryAccessTest,
+            )?;
+            let res = this.pthread_getname_np(thread, name, len, /* truncate*/ false)?;
+            assert!(res);
+            Scalar::from_u32(0)
+        }
+        op => throw_unsup_format!("Miri does not support `prctl` syscall with op={}", op),
+    };
+    this.write_scalar(res, dest)?;
+    interp_ok(())
+}