Merge from rustc

Author: The rustc-dev-guide Cronjob Bot

src/bin/miri.rs

@@ -29,7 +29,7 @@ use std::num::NonZero;
 use std::ops::Range;
 use std::path::PathBuf;
 use std::str::FromStr;
-use std::sync::Once;
+use std::sync::{Arc, Once};
 use std::sync::atomic::{AtomicI32, AtomicU32, Ordering};
 
 use miri::{
@@ -38,7 +38,6 @@ use miri::{
 };
 use rustc_abi::ExternAbi;
 use rustc_data_structures::sync;
-use rustc_data_structures::sync::Lrc;
 use rustc_driver::Compilation;
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_hir::{self as hir, Node};
@@ -134,7 +133,7 @@ impl rustc_driver::Callbacks for MiriCompilerCalls {
                 // HACK: rustc will emit "crate ... required to be available in rlib format, but
                 // was not found in this form" errors once we use `tcx.dependency_formats()` if
                 // there's no rlib provided, so setting a dummy path here to workaround those errors.
-                Lrc::make_mut(&mut crate_source).rlib = Some((PathBuf::new(), PathKind::All));
+                Arc::make_mut(&mut crate_source).rlib = Some((PathBuf::new(), PathKind::All));
                 crate_source
             };
         });

src/lib.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(bootstrap, feature(trait_upcasting))]
 #![feature(rustc_private)]
 #![feature(cell_update)]
 #![feature(float_gamma)]
@@ -9,7 +10,6 @@
 #![feature(yeet_expr)]
 #![feature(nonzero_ops)]
 #![feature(let_chains)]
-#![feature(trait_upcasting)]
 #![feature(strict_overflow_ops)]
 #![feature(pointer_is_aligned_to)]
 #![feature(unqualified_local_imports)]

src/machine.rs

@@ -1150,6 +1150,11 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
         interp_ok(ecx.tcx.sess.ub_checks())
     }
 
+    #[inline(always)]
+    fn contract_checks(ecx: &InterpCx<'tcx, Self>) -> InterpResult<'tcx, bool> {
+        interp_ok(ecx.tcx.sess.contract_checks())
+    }
+
     #[inline(always)]
     fn thread_local_static_pointer(
         ecx: &mut MiriInterpCx<'tcx>,

tests/fail/dyn-upcast-trait-mismatch.rs

@@ -1,9 +1,6 @@
 // Validation stops this too early.
 //@compile-flags: -Zmiri-disable-validation
 
-#![feature(trait_upcasting)]
-#![allow(incomplete_features)]
-
 trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
     #[allow(dead_code)]
     fn a(&self) -> i32 {

tests/fail/intrinsics/disjoint_bitor.rs

@@ -0,0 +1,5 @@
+#![feature(core_intrinsics)]
+fn main() {
+    // one bit in common
+    unsafe { std::intrinsics::disjoint_bitor(0b01101001_u8, 0b10001110) }; //~ ERROR: Undefined Behavior
+}

tests/fail/intrinsics/disjoint_bitor.stderr

@@ -0,0 +1,15 @@
+error: Undefined Behavior: `assume` called with `false`
+  --> tests/fail/intrinsics/disjoint_bitor.rs:LL:CC
+   |
+LL |     unsafe { std::intrinsics::disjoint_bitor(0b01101001_u8, 0b10001110) };
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `assume` called with `false`
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/disjoint_bitor.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+

tests/fail/intrinsics/ptr_offset_from_different_allocs.rs

@@ -0,0 +1,5 @@
+fn main() {
+    unsafe {
+        (&1_u8 as *const u8).offset_from(&2_u8); //~ERROR: not both derived from the same allocation
+    }
+}

tests/fail/intrinsics/ptr_offset_from_different_allocs.stderr

@@ -0,0 +1,15 @@
+error: Undefined Behavior: `ptr_offset_from` called on two different pointers that are not both derived from the same allocation
+  --> tests/fail/intrinsics/ptr_offset_from_different_allocs.rs:LL:CC
+   |
+LL |         (&1_u8 as *const u8).offset_from(&2_u8);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `ptr_offset_from` called on two different pointers that are not both derived from the same allocation
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/ptr_offset_from_different_allocs.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+

tests/fail/intrinsics/ptr_offset_from_different_ints.rs

@@ -15,6 +15,6 @@ fn main() {
         let _ = p1.byte_offset_from(p1);
 
         // UB because different pointers.
-        let _ = p1.byte_offset_from(p2); //~ERROR: no provenance
+        let _ = p1.byte_offset_from(p2); //~ERROR: not both derived from the same allocation
     }
 }

tests/fail/intrinsics/ptr_offset_from_different_ints.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: out-of-bounds `offset_from` origin: expected a pointer to the end of 1 byte of memory, but got 0xb[noalloc] which is a dangling pointer (it has no provenance)
+error: Undefined Behavior: `ptr_offset_from` called on two different pointers that are not both derived from the same allocation
   --> tests/fail/intrinsics/ptr_offset_from_different_ints.rs:LL:CC
    |
 LL |         let _ = p1.byte_offset_from(p2);
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds `offset_from` origin: expected a pointer to the end of 1 byte of memory, but got 0xb[noalloc] which is a dangling pointer (it has no provenance)
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^ `ptr_offset_from` called on two different pointers that are not both derived from the same allocation
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information