Update Rust toolchain to 2023-09-23

Source changes required by the following upstream commits:

* rust-lang/rust@5a0a1ff0cd move ConstValue into mir
* rust-lang/rust@ea22adbabd adjust constValue::Slice to work for arbitrary slice types
* rust-lang/rust@c94410c145 rename mir::Constant -> mir::ConstOperand, mir::ConstKind -> mir::Const

Fixes: model-checking#2784

kani-compiler/src/codegen_cprover_gotoc/codegen/operand.rs

@@ -6,10 +6,8 @@ use crate::unwrap_or_return_codegen_unimplemented;
 use cbmc::btree_string_map;
 use cbmc::goto_program::{DatatypeComponent, Expr, ExprValue, Location, Stmt, Symbol, Type};
 use rustc_ast::ast::Mutability;
-use rustc_middle::mir::interpret::{
-    read_target_uint, AllocId, Allocation, ConstValue, GlobalAlloc, Scalar,
-};
-use rustc_middle::mir::{Constant, ConstantKind, Operand, UnevaluatedConst};
+use rustc_middle::mir::interpret::{read_target_uint, AllocId, Allocation, GlobalAlloc, Scalar};
+use rustc_middle::mir::{Const as mirConst, ConstOperand, ConstValue, Operand, UnevaluatedConst};
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, Const, ConstKind, FloatTy, Instance, IntTy, Ty, Uint, UintTy};
 use rustc_span::def_id::DefId;
@@ -56,13 +54,13 @@ impl<'tcx> GotocCtx<'tcx> {
     /// 1. `Ty` means e.g. that it's a const generic parameter. (See `codegen_const`)
     /// 2. `Val` means it's a constant value of various kinds. (See `codegen_const_value`)
     /// 3. `Unevaluated` means we need to run the interpreter, to get a `ConstValue`. (See `codegen_const_unevaluated`)
-    fn codegen_constant(&mut self, c: &Constant<'tcx>) -> Expr {
+    fn codegen_constant(&mut self, c: &ConstOperand<'tcx>) -> Expr {
         trace!(constant=?c, "codegen_constant");
         let span = Some(&c.span);
-        match self.monomorphize(c.literal) {
-            ConstantKind::Ty(ct) => self.codegen_const(ct, span),
-            ConstantKind::Val(val, ty) => self.codegen_const_value(val, ty, span),
-            ConstantKind::Unevaluated(unevaluated, ty) => {
+        match self.monomorphize(c.const_) {
+            mirConst::Ty(ct) => self.codegen_const(ct, span),
+            mirConst::Val(val, ty) => self.codegen_const_value(val, ty, span),
+            mirConst::Unevaluated(unevaluated, ty) => {
                 self.codegen_const_unevaluated(unevaluated, ty, span)
             }
         }
@@ -125,8 +123,8 @@ impl<'tcx> GotocCtx<'tcx> {
         trace!(val=?v, ?lit_ty, "codegen_const_value");
         match v {
             ConstValue::Scalar(s) => self.codegen_scalar(s, lit_ty, span),
-            ConstValue::Slice { data, start, end } => {
-                self.codegen_slice_value(v, lit_ty, span, data.inner(), start, end)
+            ConstValue::Slice { data, meta } => {
+                self.codegen_slice_value(v, lit_ty, span, data.inner(), meta.try_into().unwrap())
             }
             ConstValue::Indirect { alloc_id, offset } => {
                 let alloc = self.tcx.global_alloc(alloc_id).unwrap_memory();
@@ -155,15 +153,12 @@ impl<'tcx> GotocCtx<'tcx> {
         lit_ty: Ty<'tcx>,
         span: Option<&Span>,
         data: &'tcx Allocation,
-        start: usize,
-        end: usize,
+        size: usize,
     ) -> Expr {
         if let ty::Ref(_, ref_ty, _) = lit_ty.kind() {
             match ref_ty.kind() {
                 ty::Str => {
                     // a string literal
-                    // These seem to always start at 0
-                    assert_eq!(start, 0);
                     // Create a static variable that holds its value
                     let mem_var = self.codegen_const_allocation(data, None);
 
@@ -179,15 +174,15 @@ impl<'tcx> GotocCtx<'tcx> {
                     };
 
                     // Extract the actual string literal
-                    let slice = data.inspect_with_uninit_and_ptr_outside_interpreter(start..end);
+                    let slice = data.inspect_with_uninit_and_ptr_outside_interpreter(0..size);
                     let s = ::std::str::from_utf8(slice).expect("non utf8 str from miri");
 
                     // Store the identifier to the string literal in the goto context
                     self.str_literals.insert(*ident, s.into());
 
                     // Codegen as a fat pointer
                     let data_expr = mem_var.cast_to(Type::unsigned_int(8).to_pointer());
-                    let len_expr = Expr::int_constant(end - start, Type::size_t());
+                    let len_expr = Expr::int_constant(size, Type::size_t());
                     return slice_fat_ptr(
                         self.codegen_ty(lit_ty),
                         data_expr,
@@ -198,8 +193,7 @@ impl<'tcx> GotocCtx<'tcx> {
                 ty::Slice(slice_ty) => {
                     if let Uint(UintTy::U8) = slice_ty.kind() {
                         let mem_var = self.codegen_const_allocation(data, None);
-                        let slice =
-                            data.inspect_with_uninit_and_ptr_outside_interpreter(start..end);
+                        let slice = data.inspect_with_uninit_and_ptr_outside_interpreter(0..size);
                         let len = slice.len();
                         let data_expr = mem_var.cast_to(Type::unsigned_int(8).to_pointer());
                         let len_expr = Expr::int_constant(len, Type::size_t());

kani-compiler/src/kani_middle/intrinsics.rs

@@ -3,7 +3,7 @@
 //! This module contains a MIR pass that replaces some intrinsics by rust intrinsics models as
 //! well as validation logic that can only be added during monomorphization.
 use rustc_index::IndexVec;
-use rustc_middle::mir::{interpret::ConstValue, Body, ConstantKind, Operand, TerminatorKind};
+use rustc_middle::mir::{Body, Const as mirConst, ConstValue, Operand, TerminatorKind};
 use rustc_middle::mir::{Local, LocalDecl};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::ty::{Const, GenericArgsRef};
@@ -69,7 +69,7 @@ impl<'tcx> ModelIntrinsics<'tcx> {
             new_gen_args.push(len.into());
 
             let Operand::Constant(fn_def) = func else { unreachable!() };
-            fn_def.literal = ConstantKind::from_value(
+            fn_def.const_ = mirConst::from_value(
                 ConstValue::ZeroSized,
                 tcx.type_of(stub_id).instantiate(tcx, &new_gen_args),
             );

kani-compiler/src/kani_middle/reachability.rs

@@ -22,11 +22,11 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::ItemId;
-use rustc_middle::mir::interpret::{AllocId, ConstValue, ErrorHandled, GlobalAlloc, Scalar};
+use rustc_middle::mir::interpret::{AllocId, ErrorHandled, GlobalAlloc, Scalar};
 use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::visit::Visitor as MirVisitor;
 use rustc_middle::mir::{
-    Body, CastKind, Constant, ConstantKind, Location, Rvalue, Terminator, TerminatorKind,
+    Body, CastKind, Const, ConstOperand, ConstValue, Location, Rvalue, Terminator, TerminatorKind,
     UnevaluatedConst,
 };
 use rustc_middle::span_bug;
@@ -322,7 +322,7 @@ impl<'a, 'tcx> MonoItemsFnCollector<'a, 'tcx> {
             ConstValue::Scalar(Scalar::Ptr(ptr, _size)) => {
                 self.collected.extend(collect_alloc_items(self.tcx, ptr.provenance).iter());
             }
-            ConstValue::Slice { data: alloc, start: _, end: _ } => {
+            ConstValue::Slice { data: alloc, .. } => {
                 for id in alloc.inner().provenance().provenances() {
                     self.collected.extend(collect_alloc_items(self.tcx, id).iter())
                 }
@@ -435,12 +435,12 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MonoItemsFnCollector<'a, 'tcx> {
     }
 
     /// Collect constants that are represented as static variables.
-    fn visit_constant(&mut self, constant: &Constant<'tcx>, location: Location) {
-        let literal = self.monomorphize(constant.literal);
-        debug!(?constant, ?location, ?literal, "visit_constant");
-        let val = match literal {
-            ConstantKind::Val(const_val, _) => const_val,
-            ConstantKind::Ty(ct) => match ct.kind() {
+    fn visit_constant(&mut self, constant: &ConstOperand<'tcx>, location: Location) {
+        let const_ = self.monomorphize(constant.const_);
+        debug!(?constant, ?location, ?const_, "visit_constant");
+        let val = match const_ {
+            Const::Val(const_val, _) => const_val,
+            Const::Ty(ct) => match ct.kind() {
                 ConstKind::Value(v) => self.tcx.valtree_to_const_val((ct.ty(), v)),
                 ConstKind::Unevaluated(_) => unreachable!(),
                 // Nothing to do
@@ -454,7 +454,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MonoItemsFnCollector<'a, 'tcx> {
                     unreachable!("Unexpected constant type {:?} ({:?})", ct, ct.kind())
                 }
             },
-            ConstantKind::Unevaluated(un_eval, _) => {
+            Const::Unevaluated(un_eval, _) => {
                 // Thread local fall into this category.
                 match self.tcx.const_eval_resolve(ParamEnv::reveal_all(), un_eval, None) {
                     // The `monomorphize` call should have evaluated that constant already.
@@ -473,8 +473,8 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MonoItemsFnCollector<'a, 'tcx> {
                             span_bug!(
                                 span,
                                 "Unexpected polymorphic constant: {:?} {:?}",
-                                literal,
-                                constant.literal
+                                const_,
+                                constant.const_
                             )
                         }
                     }

kani-compiler/src/kani_middle/stubbing/transform.rs

@@ -14,8 +14,7 @@ use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_hir::{def_id::DefId, definitions::DefPathHash};
 use rustc_index::IndexVec;
 use rustc_middle::mir::{
-    interpret::ConstValue, visit::MutVisitor, Body, ConstantKind, Local, LocalDecl, Location,
-    Operand,
+    visit::MutVisitor, Body, Const, ConstValue, Local, LocalDecl, Location, Operand,
 };
 use rustc_middle::ty::{self, TyCtxt};
 
@@ -79,7 +78,7 @@ impl<'tcx> MutVisitor<'tcx> for ForeignFunctionTransformer<'tcx> {
                     let Operand::Constant(function_definition) = operand else {
                         return;
                     };
-                    function_definition.literal = ConstantKind::from_value(
+                    function_definition.const_ = Const::from_value(
                         ConstValue::ZeroSized,
                         self.tcx.type_of(stub).instantiate(self.tcx, arguments),
                     );

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2023-09-19"
+channel = "nightly-2023-09-23"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src", "rustfmt"]