Distinguish between library and lang UB in assert_unsafe_precondition

3 files changed, 12 insertions, 4 deletions

diff --git a/compiler/rustc_middle/src/mir/pretty.rs b/compiler/rustc_middle/src/mir/pretty.rs
index e058302af31..18069547a7e 100644
--- a/compiler/rustc_middle/src/mir/pretty.rs
+++ b/compiler/rustc_middle/src/mir/pretty.rs
@@ -915,7 +915,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                     NullOp::SizeOf => write!(fmt, "SizeOf({t})"),
                     NullOp::AlignOf => write!(fmt, "AlignOf({t})"),
                     NullOp::OffsetOf(fields) => write!(fmt, "OffsetOf({t}, {fields:?})"),
-                    NullOp::DebugAssertions => write!(fmt, "cfg!(debug_assertions)"),
+                    NullOp::UbCheck(kind) => write!(fmt, "UbCheck({kind:?})"),
                 }
             }
             ThreadLocalRef(did) => ty::tls::with(|tcx| {
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
index f188923f876..0ab797134c0 100644
--- a/compiler/rustc_middle/src/mir/syntax.rs
+++ b/compiler/rustc_middle/src/mir/syntax.rs
@@ -1366,8 +1366,16 @@ pub enum NullOp<'tcx> {
     AlignOf,
     /// Returns the offset of a field
     OffsetOf(&'tcx List<(VariantIdx, FieldIdx)>),
-    /// cfg!(debug_assertions), but expanded in codegen
-    DebugAssertions,
+    /// Returns whether we want to check for library UB or language UB at monomorphization time.
+    /// Both kinds of UB evaluate to `true` in codegen, and only library UB evalutes to `true` in
+    /// const-eval/Miri, because the interpreter has its own better checks for language UB.
+    UbCheck(UbKind),
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
+pub enum UbKind {
+    LanguageUb,
+    LibraryUb,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/compiler/rustc_middle/src/mir/tcx.rs b/compiler/rustc_middle/src/mir/tcx.rs
index 5bc151de659..0c29fe57d4f 100644
--- a/compiler/rustc_middle/src/mir/tcx.rs
+++ b/compiler/rustc_middle/src/mir/tcx.rs
@@ -194,7 +194,7 @@ impl<'tcx> Rvalue<'tcx> {
             Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf | NullOp::OffsetOf(..), _) => {
                 tcx.types.usize
             }
-            Rvalue::NullaryOp(NullOp::DebugAssertions, _) => tcx.types.bool,
+            Rvalue::NullaryOp(NullOp::UbCheck(_), _) => tcx.types.bool,
             Rvalue::Aggregate(ref ak, ref ops) => match **ak {
                 AggregateKind::Array(ty) => Ty::new_array(tcx, ty, ops.len() as u64),
                 AggregateKind::Tuple => {