3 files changed, 24 insertions, 3 deletions
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
index e14c9ea9a5d..27b8377a9e0 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -775,6 +775,18 @@ impl Integer {
         }
     }
 
+    /// Returns the largest signed value that can be represented by this Integer.
+    #[inline]
+    pub fn signed_max(self) -> i128 {
+        match self {
+            I8 => i8::MAX as i128,
+            I16 => i16::MAX as i128,
+            I32 => i32::MAX as i128,
+            I64 => i64::MAX as i128,
+            I128 => i128::MAX,
+        }
+    }
+
     /// Finds the smallest Integer type which can represent the signed value.
     #[inline]
     pub fn fit_signed(x: i128) -> Integer {
diff --git a/compiler/rustc_codegen_ssa/src/glue.rs b/compiler/rustc_codegen_ssa/src/glue.rs
index 6015d48deca..0f6e6032f9b 100644
--- a/compiler/rustc_codegen_ssa/src/glue.rs
+++ b/compiler/rustc_codegen_ssa/src/glue.rs
@@ -29,6 +29,9 @@ pub fn size_and_align_of_dst<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
             let align = meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_ALIGN)
                 .get_usize(bx, vtable);
 
+            // Size is always <= isize::MAX.
+            let size_bound = bx.data_layout().ptr_sized_integer().signed_max() as u128;
+            bx.range_metadata(size, WrappingRange { start: 0, end: size_bound });
             // Alignment is always nonzero.
             bx.range_metadata(align, WrappingRange { start: 1, end: !0 });
 
diff --git a/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs b/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs
index 215edbe02c0..a75609260ed 100644
--- a/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs
@@ -110,10 +110,16 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     _ => bug!(),
                 };
                 let value = meth::VirtualIndex::from_index(idx).get_usize(bx, vtable);
-                if name == sym::vtable_align {
+                match name {
+                    // Size is always <= isize::MAX.
+                    sym::vtable_size => {
+                        let size_bound = bx.data_layout().ptr_sized_integer().signed_max() as u128;
+                        bx.range_metadata(value, WrappingRange { start: 0, end: size_bound });
+                    },
                     // Alignment is always nonzero.
-                    bx.range_metadata(value, WrappingRange { start: 1, end: !0 });
-                };
+                    sym::vtable_align => bx.range_metadata(value, WrappingRange { start: 1, end: !0 }),
+                    _ => {}
+                }
                 value
             }
             sym::pref_align_of