Upgrade toolchain to nightly-2023-01-23 (#2149)

Upgrade our toolchain to `nightly-2023-01-23`. The changes here are related to the following changes:
- rust-lang/rust#104986
- rust-lang/rust#105657
- rust-lang/rust#105603
- rust-lang/rust#105613
- rust-lang/rust#105977
- rust-lang/rust#104645

Author: celinval

.github/workflows/cbmc-latest.yml

@@ -89,3 +89,8 @@ jobs:
       - name: Execute Kani performance tests
         working-directory: ./kani
         run: ./scripts/kani-perf.sh
+
+      - name: Execute Kani performance ignored tests
+        working-directory: ./kani
+        continue-on-error: true
+        run: cargo run -p compiletest -- --suite perf --mode cargo-kani-test ignore --ignored --no-fail-fast

kani-compiler/kani_queries/src/lib.rs

@@ -10,27 +10,22 @@ mod unsound_experiments;
 #[cfg(feature = "unsound_experiments")]
 use crate::unsound_experiments::UnsoundExperiments;
 
-#[derive(Debug, Clone, Copy, AsRefStr, EnumString, EnumVariantNames, PartialEq, Eq)]
+#[derive(Debug, Default, Clone, Copy, AsRefStr, EnumString, EnumVariantNames, PartialEq, Eq)]
 #[strum(serialize_all = "snake_case")]
 pub enum ReachabilityType {
     /// Start the cross-crate reachability analysis from all harnesses in the local crate.
     Harnesses,
     /// Use standard rustc monomorphizer algorithm.
     Legacy,
     /// Don't perform any reachability analysis. This will skip codegen for this crate.
+    #[default]
     None,
     /// Start the cross-crate reachability analysis from all public functions in the local crate.
     PubFns,
     /// Start the cross-crate reachability analysis from all *test* (i.e. `#[test]`) harnesses in the local crate.
     Tests,
 }
 
-impl Default for ReachabilityType {
-    fn default() -> Self {
-        ReachabilityType::None
-    }
-}
-
 pub trait UserInput {
     fn set_emit_vtable_restrictions(&mut self, restrictions: bool);
     fn get_emit_vtable_restrictions(&self) -> bool;

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

@@ -365,7 +365,9 @@ impl<'tcx> GotocCtx<'tcx> {
             "add_with_overflow" => codegen_op_with_overflow!(add_overflow_result),
             "arith_offset" => self.codegen_offset(intrinsic, instance, fargs, p, loc),
             "assert_inhabited" => self.codegen_assert_intrinsic(instance, intrinsic, span),
-            "assert_uninit_valid" => self.codegen_assert_intrinsic(instance, intrinsic, span),
+            "assert_mem_uninitialized_valid" => {
+                self.codegen_assert_intrinsic(instance, intrinsic, span)
+            }
             "assert_zero_valid" => self.codegen_assert_intrinsic(instance, intrinsic, span),
             // https://doc.rust-lang.org/core/intrinsics/fn.assume.html
             // Informs the optimizer that a condition is always true.

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

@@ -243,7 +243,8 @@ impl<'tcx> GotocCtx<'tcx> {
         match t {
             TypeOrVariant::Type(t) => {
                 match t.kind() {
-                    ty::Bool
+                    ty::Alias(..)
+                    | ty::Bool
                     | ty::Char
                     | ty::Int(_)
                     | ty::Uint(_)
@@ -254,10 +255,8 @@ impl<'tcx> GotocCtx<'tcx> {
                     | ty::GeneratorWitness(..)
                     | ty::Foreign(..)
                     | ty::Dynamic(..)
-                    | ty::Projection(_)
                     | ty::Bound(..)
                     | ty::Placeholder(..)
-                    | ty::Opaque(..)
                     | ty::Param(_)
                     | ty::Infer(_)
                     | ty::Error(_) => unreachable!("type {:?} does not have a field", t),

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

@@ -358,20 +358,41 @@ impl<'tcx> GotocCtx<'tcx> {
         // `Generator::resume(...) -> GeneratorState` function in case we
         // have an ordinary generator, or the `Future::poll(...) -> Poll`
         // function in case this is a special generator backing an async construct.
-        let ret_ty = if self.tcx.generator_is_async(*did) {
-            let state_did = self.tcx.require_lang_item(LangItem::Poll, None);
-            let state_adt_ref = self.tcx.adt_def(state_did);
-            let state_substs = self.tcx.intern_substs(&[sig.return_ty.into()]);
-            self.tcx.mk_adt(state_adt_ref, state_substs)
+        let tcx = self.tcx;
+        let (resume_ty, ret_ty) = if tcx.generator_is_async(*did) {
+            // The signature should be `Future::poll(_, &mut Context<'_>) -> Poll<Output>`
+            let poll_did = tcx.require_lang_item(LangItem::Poll, None);
+            let poll_adt_ref = tcx.adt_def(poll_did);
+            let poll_substs = tcx.intern_substs(&[sig.return_ty.into()]);
+            let ret_ty = tcx.mk_adt(poll_adt_ref, poll_substs);
+
+            // We have to replace the `ResumeTy` that is used for type and borrow checking
+            // with `&mut Context<'_>` which is used in codegen.
+            #[cfg(debug_assertions)]
+            {
+                if let ty::Adt(resume_ty_adt, _) = sig.resume_ty.kind() {
+                    let expected_adt = tcx.adt_def(tcx.require_lang_item(LangItem::ResumeTy, None));
+                    assert_eq!(*resume_ty_adt, expected_adt);
+                } else {
+                    panic!("expected `ResumeTy`, found `{:?}`", sig.resume_ty);
+                };
+            }
+            let context_mut_ref = tcx.mk_task_context();
+
+            (context_mut_ref, ret_ty)
         } else {
-            let state_did = self.tcx.require_lang_item(LangItem::GeneratorState, None);
-            let state_adt_ref = self.tcx.adt_def(state_did);
-            let state_substs = self.tcx.intern_substs(&[sig.yield_ty.into(), sig.return_ty.into()]);
-            self.tcx.mk_adt(state_adt_ref, state_substs)
+            // The signature should be `Generator::resume(_, Resume) -> GeneratorState<Yield, Return>`
+            let state_did = tcx.require_lang_item(LangItem::GeneratorState, None);
+            let state_adt_ref = tcx.adt_def(state_did);
+            let state_substs = tcx.intern_substs(&[sig.yield_ty.into(), sig.return_ty.into()]);
+            let ret_ty = tcx.mk_adt(state_adt_ref, state_substs);
+
+            (sig.resume_ty, ret_ty)
         };
+
         ty::Binder::bind_with_vars(
-            self.tcx.mk_fn_sig(
-                [env_ty, sig.resume_ty].iter(),
+            tcx.mk_fn_sig(
+                [env_ty, resume_ty].iter(),
                 &ret_ty,
                 false,
                 Unsafety::Normal,
@@ -813,7 +834,7 @@ impl<'tcx> GotocCtx<'tcx> {
                     )
                 }
             }
-            ty::Projection(_) | ty::Opaque(_, _) => {
+            ty::Alias(..) => {
                 unreachable!("Type should've been normalized already")
             }
 
@@ -1226,7 +1247,7 @@ impl<'tcx> GotocCtx<'tcx> {
             ty::Dynamic(..) | ty::Slice(_) | ty::Str => {
                 unreachable!("Should have generated a fat pointer")
             }
-            ty::Projection(_) | ty::Opaque(..) => {
+            ty::Alias(..) => {
                 unreachable!("Should have been removed by normalization")
             }
 

kani-compiler/src/kani_compiler.rs

@@ -169,7 +169,7 @@ impl Callbacks for KaniCompiler {
         rustc_queries: &'tcx rustc_interface::Queries<'tcx>,
     ) -> Compilation {
         if self.stubs.is_none() && self.queries.lock().unwrap().get_stubbing_enabled() {
-            rustc_queries.global_ctxt().unwrap().peek_mut().enter(|tcx| {
+            rustc_queries.global_ctxt().unwrap().enter(|tcx| {
                 let stubs = self.stubs.insert(self.collect_stubs(tcx));
                 debug!(?stubs, "after_analysis");
                 if stubs.is_empty() { Compilation::Continue } else { Compilation::Stop }

kani-compiler/src/kani_middle/attributes.rs

@@ -276,7 +276,7 @@ fn parse_solver(tcx: TyCtxt, attr: &Attribute) -> Option<CbmcSolver> {
             }
         }
         MetaItemKind::NameValue(lit) if ident_str == "bin" && lit.kind.is_str() => {
-            Some(CbmcSolver::Binary(lit.token_lit.symbol.to_string()))
+            Some(CbmcSolver::Binary(lit.symbol.to_string()))
         }
         _ => {
             invalid_arg_err(attr);

kani-compiler/src/kani_middle/coercion.rs

@@ -17,7 +17,7 @@ use rustc_hir::lang_items::LangItem;
 use rustc_middle::traits::{ImplSource, ImplSourceUserDefinedData};
 use rustc_middle::ty::adjustment::CustomCoerceUnsized;
 use rustc_middle::ty::TypeAndMut;
-use rustc_middle::ty::{self, ParamEnv, TraitRef, Ty, TyCtxt};
+use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt};
 use rustc_span::symbol::Symbol;
 use tracing::trace;
 
@@ -213,10 +213,9 @@ fn custom_coerce_unsize_info<'tcx>(
 ) -> CustomCoerceUnsized {
     let def_id = tcx.require_lang_item(LangItem::CoerceUnsized, None);
 
-    let trait_ref = ty::Binder::dummy(TraitRef {
-        def_id,
-        substs: tcx.mk_substs_trait(source_ty, [target_ty.into()]),
-    });
+    let trait_ref = ty::Binder::dummy(
+        tcx.mk_trait_ref(def_id, tcx.mk_substs_trait(source_ty, [target_ty.into()])),
+    );
 
     match tcx.codegen_select_candidate((ParamEnv::reveal_all(), trait_ref)) {
         Ok(ImplSource::UserDefined(ImplSourceUserDefinedData { impl_def_id, .. })) => {

kani-compiler/src/session.rs

@@ -70,7 +70,10 @@ pub fn init_session(args: &ArgMatches, json_hook: bool) {
     // Initialize the rustc logger using value from RUSTC_LOG. We keep the log control separate
     // because we cannot control the RUSTC log format unless if we match the exact tracing
     // version used by RUSTC.
-    rustc_driver::init_rustc_env_logger();
+    // TODO: Enable rustc log when we upgrade the toolchain.
+    // <https://github.com/model-checking/kani/issues/2283>
+    //
+    // rustc_driver::init_rustc_env_logger();
 
     // Install Kani panic hook.
     if json_hook {

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2022-12-11"
+channel = "nightly-2023-01-23"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src", "rustfmt"]