Merge #80

80: Automated pull from upstream `master` r=tshepang a=github-actions[bot] This PR pulls the following changes from the upstream repository: * rust-lang/rust#117498 * rust-lang/rust#117488 * rust-lang/rust#117441 * rust-lang/rust#117373 * rust-lang/rust#117298 * rust-lang/rust#117029 * rust-lang/rust#117289 * rust-lang/rust#117307 * rust-lang/rust#114208 * rust-lang/rust#117482 * rust-lang/rust#117475 * rust-lang/rust#117401 * rust-lang/rust#117397 * rust-lang/rust#115626 * rust-lang/rust#117436 * rust-lang/rust#115356 * rust-lang/rust#117422 * rust-lang/rust#116692 Co-authored-by: David CARLIER <devnexen@gmail.com> Co-authored-by: Taiki Endo <te316e89@gmail.com> Co-authored-by: ltdk <usr@ltdk.xyz> Co-authored-by: Ryan Mehri <ryan.mehri1@gmail.com>
ferrocene · Nov 2, 2023 · 0800006 · 0800006
2 parents 075dd45 + 6ea37b7
commit 0800006
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diff --git a/Cargo.lock b/Cargo.lock
@@ -3097,9 +3097,9 @@ dependencies = [
 
 [[package]]
 name = "minifier"
-version = "0.2.3"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5394aa376422b4b2b6c02fd9cfcb657e4ec544ae98e43d7d5d785fd0d042fd6d"
+checksum = "95bbbf96b9ac3482c2a25450b67a15ed851319bc5fabf3b40742ea9066e84282"
 
 [[package]]
 name = "minimal-lexical"

diff --git a/compiler/rustc_codegen_cranelift/src/base.rs b/compiler/rustc_codegen_cranelift/src/base.rs
@@ -766,7 +766,7 @@ fn codegen_stmt<'tcx>(
                         NullOp::SizeOf => layout.size.bytes(),
                         NullOp::AlignOf => layout.align.abi.bytes(),
                         NullOp::OffsetOf(fields) => {
-                            layout.offset_of_subfield(fx, fields.iter().map(|f| f.index())).bytes()
+                            layout.offset_of_subfield(fx, fields.iter()).bytes()
                         }
                     };
                     let val = CValue::by_val(

diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -680,7 +680,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                         layout.align.abi.bytes()
                     }
                     mir::NullOp::OffsetOf(fields) => {
-                        layout.offset_of_subfield(bx.cx(), fields.iter().map(|f| f.index())).bytes()
+                        layout.offset_of_subfield(bx.cx(), fields.iter()).bytes()
                     }
                 };
                 let val = bx.cx().const_usize(val);

diff --git a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs
@@ -106,10 +106,16 @@ pub(crate) fn mk_eval_cx<'mir, 'tcx>(
 }
 
 /// This function converts an interpreter value into a MIR constant.
+///
+/// The `for_diagnostics` flag turns the usual rules for returning `ConstValue::Scalar` into a
+/// best-effort attempt. This is not okay for use in const-eval sine it breaks invariants rustc
+/// relies on, but it is okay for diagnostics which will just give up gracefully when they
+/// encounter an `Indirect` they cannot handle.
 #[instrument(skip(ecx), level = "debug")]
 pub(super) fn op_to_const<'tcx>(
     ecx: &CompileTimeEvalContext<'_, 'tcx>,
     op: &OpTy<'tcx>,
+    for_diagnostics: bool,
 ) -> ConstValue<'tcx> {
     // Handle ZST consistently and early.
     if op.layout.is_zst() {
@@ -133,7 +139,13 @@ pub(super) fn op_to_const<'tcx>(
         _ => false,
     };
     let immediate = if force_as_immediate {
-        Right(ecx.read_immediate(op).expect("normalization works on validated constants"))
+        match ecx.read_immediate(op) {
+            Ok(imm) => Right(imm),
+            Err(err) if !for_diagnostics => {
+                panic!("normalization works on validated constants: {err:?}")
+            }
+            _ => op.as_mplace_or_imm(),
+        }
     } else {
         op.as_mplace_or_imm()
     };
@@ -205,7 +217,7 @@ pub(crate) fn turn_into_const_value<'tcx>(
     );
 
     // Turn this into a proper constant.
-    op_to_const(&ecx, &mplace.into())
+    op_to_const(&ecx, &mplace.into(), /* for diagnostics */ false)
 }
 
 #[instrument(skip(tcx), level = "debug")]

diff --git a/compiler/rustc_const_eval/src/const_eval/mod.rs b/compiler/rustc_const_eval/src/const_eval/mod.rs
@@ -72,7 +72,7 @@ pub(crate) fn eval_to_valtree<'tcx>(
 }
 
 #[instrument(skip(tcx), level = "debug")]
-pub(crate) fn try_destructure_mir_constant_for_diagnostics<'tcx>(
+pub(crate) fn try_destructure_mir_constant_for_user_output<'tcx>(
     tcx: TyCtxtAt<'tcx>,
     val: mir::ConstValue<'tcx>,
     ty: Ty<'tcx>,
@@ -99,7 +99,7 @@ pub(crate) fn try_destructure_mir_constant_for_diagnostics<'tcx>(
     let fields_iter = (0..field_count)
         .map(|i| {
             let field_op = ecx.project_field(&down, i).ok()?;
-            let val = op_to_const(&ecx, &field_op);
+            let val = op_to_const(&ecx, &field_op, /* for diagnostics */ true);
             Some((val, field_op.layout.ty))
         })
         .collect::<Option<Vec<_>>>()?;

diff --git a/compiler/rustc_const_eval/src/const_eval/valtrees.rs b/compiler/rustc_const_eval/src/const_eval/valtrees.rs
@@ -232,7 +232,7 @@ pub fn valtree_to_const_value<'tcx>(
             let mut ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, CanAccessStatics::No);
             let imm = valtree_to_ref(&mut ecx, valtree, *inner_ty);
             let imm = ImmTy::from_immediate(imm, tcx.layout_of(param_env_ty).unwrap());
-            op_to_const(&ecx, &imm.into())
+            op_to_const(&ecx, &imm.into(), /* for diagnostics */ false)
         }
         ty::Tuple(_) | ty::Array(_, _) | ty::Adt(..) => {
             let layout = tcx.layout_of(param_env_ty).unwrap();
@@ -265,7 +265,7 @@ pub fn valtree_to_const_value<'tcx>(
             dump_place(&ecx, &place);
             intern_const_alloc_recursive(&mut ecx, InternKind::Constant, &place).unwrap();
 
-            op_to_const(&ecx, &place.into())
+            op_to_const(&ecx, &place.into(), /* for diagnostics */ false)
         }
         ty::Never
         | ty::Error(_)

diff --git a/compiler/rustc_const_eval/src/interpret/cast.rs b/compiler/rustc_const_eval/src/interpret/cast.rs
@@ -145,16 +145,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert!(dest.layout.is_sized());
                 assert_eq!(cast_ty, dest.layout.ty); // we otherwise ignore `cast_ty` enirely...
                 if src.layout.size != dest.layout.size {
-                    let src_bytes = src.layout.size.bytes();
-                    let dest_bytes = dest.layout.size.bytes();
-                    let src_ty = format!("{}", src.layout.ty);
-                    let dest_ty = format!("{}", dest.layout.ty);
                     throw_ub_custom!(
                         fluent::const_eval_invalid_transmute,
-                        src_bytes = src_bytes,
-                        dest_bytes = dest_bytes,
-                        src = src_ty,
-                        dest = dest_ty,
+                        src_bytes = src.layout.size.bytes(),
+                        dest_bytes = dest.layout.size.bytes(),
+                        src = src.layout.ty,
+                        dest = dest.layout.ty,
                     );
                 }
 

diff --git a/compiler/rustc_const_eval/src/interpret/step.rs b/compiler/rustc_const_eval/src/interpret/step.rs
@@ -275,7 +275,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                     mir::NullOp::SizeOf => layout.size.bytes(),
                     mir::NullOp::AlignOf => layout.align.abi.bytes(),
                     mir::NullOp::OffsetOf(fields) => {
-                        layout.offset_of_subfield(self, fields.iter().map(|f| f.index())).bytes()
+                        layout.offset_of_subfield(self, fields.iter()).bytes()
                     }
                 };
                 self.write_scalar(Scalar::from_target_usize(val, self), &dest)?;

diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
@@ -54,8 +54,8 @@ pub fn provide(providers: &mut Providers) {
         let (param_env, raw) = param_env_and_value.into_parts();
         const_eval::eval_to_valtree(tcx, param_env, raw)
     };
-    providers.hooks.try_destructure_mir_constant_for_diagnostics =
-        const_eval::try_destructure_mir_constant_for_diagnostics;
+    providers.hooks.try_destructure_mir_constant_for_user_output =
+        const_eval::try_destructure_mir_constant_for_user_output;
     providers.valtree_to_const_val = |tcx, (ty, valtree)| {
         const_eval::valtree_to_const_value(tcx, ty::ParamEnv::empty().and(ty), valtree)
     };

diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs
@@ -1056,16 +1056,23 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                     }
                 }
             }
-            Rvalue::NullaryOp(NullOp::OffsetOf(fields), container) => {
+            Rvalue::NullaryOp(NullOp::OffsetOf(indices), container) => {
                 let fail_out_of_bounds = |this: &mut Self, location, field, ty| {
                     this.fail(location, format!("Out of bounds field {field:?} for {ty:?}"));
                 };
 
                 let mut current_ty = *container;
 
-                for field in fields.iter() {
+                for (variant, field) in indices.iter() {
                     match current_ty.kind() {
                         ty::Tuple(fields) => {
+                            if variant != FIRST_VARIANT {
+                                self.fail(
+                                    location,
+                                    format!("tried to get variant {variant:?} of tuple"),
+                                );
+                                return;
+                            }
                             let Some(&f_ty) = fields.get(field.as_usize()) else {
                                 fail_out_of_bounds(self, location, field, current_ty);
                                 return;
@@ -1074,15 +1081,7 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                             current_ty = self.tcx.normalize_erasing_regions(self.param_env, f_ty);
                         }
                         ty::Adt(adt_def, args) => {
-                            if adt_def.is_enum() {
-                                self.fail(
-                                    location,
-                                    format!("Cannot get field offset from enum {current_ty:?}"),
-                                );
-                                return;
-                            }
-
-                            let Some(field) = adt_def.non_enum_variant().fields.get(field) else {
+                            let Some(field) = adt_def.variant(variant).fields.get(field) else {
                                 fail_out_of_bounds(self, location, field, current_ty);
                                 return;
                             };
@@ -1093,7 +1092,7 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                         _ => {
                             self.fail(
                                 location,
-                                format!("Cannot get field offset from non-adt type {current_ty:?}"),
+                                format!("Cannot get offset ({variant:?}, {field:?}) from type {current_ty:?}"),
                             );
                             return;
                         }

diff --git a/compiler/rustc_error_codes/src/error_codes.rs b/compiler/rustc_error_codes/src/error_codes.rs
@@ -514,6 +514,7 @@ E0791: include_str!("./error_codes/E0791.md"),
 E0792: include_str!("./error_codes/E0792.md"),
 E0793: include_str!("./error_codes/E0793.md"),
 E0794: include_str!("./error_codes/E0794.md"),
+E0795: include_str!("./error_codes/E0795.md"),
 }
 
 // Undocumented removed error codes. Note that many removed error codes are kept in the list above

diff --git a/compiler/rustc_error_codes/src/error_codes/E0795.md b/compiler/rustc_error_codes/src/error_codes/E0795.md
@@ -0,0 +1,28 @@
+Invalid argument for the `offset_of!` macro.
+
+Erroneous code example:
+
+```compile_fail,E0795
+#![feature(offset_of)]
+
+let x = std::mem::offset_of!(Option<u8>, Some);
+```
+
+The `offset_of!` macro gives the offset of a field within a type. It can
+navigate through enum variants, but the final component of its second argument
+must be a field and not a variant.
+
+The offset of the contained `u8` in the `Option<u8>` can be found by specifying
+the field name `0`:
+
+```
+#![feature(offset_of)]
+
+let x: usize = std::mem::offset_of!(Option<u8>, Some.0);
+```
+
+The discriminant of an enumeration may be read with `core::mem::discriminant`,
+but this is not always a value physically present within the enum.
+
+Further information about enum layout may be found at
+https://rust-lang.github.io/unsafe-code-guidelines/layout/enums.html.
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
@@ -556,7 +556,7 @@ impl Drop for HandlerInner {
         // instead of "require some error happened". Sadly that isn't ideal, as
         // lints can be `#[allow]`'d, potentially leading to this triggering.
         // Also, "good path" should be replaced with a better naming.
-        if !self.has_any_message() && !self.suppressed_expected_diag {
+        if !self.has_any_message() && !self.suppressed_expected_diag && !std::thread::panicking() {
             let bugs = std::mem::replace(&mut self.delayed_good_path_bugs, Vec::new());
             self.flush_delayed(
                 bugs,