Put checks that detect UB under their own flag below debug_assertions

compiler/rustc_codegen_cranelift/src/base.rs

@@ -789,7 +789,7 @@ fn codegen_stmt<'tcx>(
                             layout.offset_of_subfield(fx, fields.iter()).bytes()
                         }
                         NullOp::UbChecks => {
-                            let val = fx.tcx.sess.opts.debug_assertions;
+                            let val = fx.tcx.sess.ub_checks();
                             let val = CValue::by_val(
                                 fx.bcx.ins().iconst(types::I8, i64::try_from(val).unwrap()),
                                 fx.layout_of(fx.tcx.types.bool),

compiler/rustc_codegen_ssa/src/mir/rvalue.rs

@@ -682,7 +682,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                         bx.cx().const_usize(val)
                     }
                     mir::NullOp::UbChecks => {
-                        let val = bx.tcx().sess.opts.debug_assertions;
+                        let val = bx.tcx().sess.ub_checks();
                         bx.cx().const_bool(val)
                     }
                 };

compiler/rustc_const_eval/src/interpret/step.rs

@@ -258,7 +258,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         let val = layout.offset_of_subfield(self, fields.iter()).bytes();
                         Scalar::from_target_usize(val, self)
                     }
-                    mir::NullOp::UbChecks => Scalar::from_bool(self.tcx.sess.opts.debug_assertions),
+                    mir::NullOp::UbChecks => Scalar::from_bool(self.tcx.sess.ub_checks()),
                 };
                 self.write_scalar(val, &dest)?;
             }

compiler/rustc_feature/src/builtin_attrs.rs

@@ -25,6 +25,7 @@ pub type GatedCfg = (Symbol, Symbol, GateFn);
 const GATED_CFGS: &[GatedCfg] = &[
     // (name in cfg, feature, function to check if the feature is enabled)
     (sym::overflow_checks, sym::cfg_overflow_checks, cfg_fn!(cfg_overflow_checks)),
+    (sym::ub_checks, sym::cfg_ub_checks, cfg_fn!(cfg_ub_checks)),
     (sym::target_thread_local, sym::cfg_target_thread_local, cfg_fn!(cfg_target_thread_local)),
     (
         sym::target_has_atomic_equal_alignment,

compiler/rustc_feature/src/unstable.rs

@@ -381,6 +381,8 @@ declare_features! (
     (unstable, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822)),
     /// Allows `cfg(target_thread_local)`.
     (unstable, cfg_target_thread_local, "1.7.0", Some(29594)),
+    /// Allows the use of `#[cfg(ub_checks)` to check if UB checks are enabled.
+    (unstable, cfg_ub_checks, "CURRENT_RUSTC_VERSION", Some(123499)),
     /// Allow conditional compilation depending on rust version
     (unstable, cfg_version, "1.45.0", Some(64796)),
     /// Allows to use the `#[cfi_encoding = ""]` attribute.

compiler/rustc_interface/src/tests.rs

@@ -846,6 +846,7 @@ fn test_unstable_options_tracking_hash() {
     tracked!(trap_unreachable, Some(false));
     tracked!(treat_err_as_bug, NonZero::new(1));
     tracked!(tune_cpu, Some(String::from("abc")));
+    tracked!(ub_checks, Some(false));
     tracked!(uninit_const_chunk_threshold, 123);
     tracked!(unleash_the_miri_inside_of_you, true);
     tracked!(use_ctors_section, Some(true));

compiler/rustc_middle/src/mir/mod.rs

@@ -777,8 +777,8 @@ impl<'tcx> Body<'tcx> {
         // _1 = const _
         // SwitchInt(_1)
         //
-        // And MIR for if intrinsics::debug_assertions() looks like this:
-        // _1 = cfg!(debug_assertions)
+        // And MIR for if intrinsics::ub_checks() looks like this:
+        // _1 = UbChecks()
         // SwitchInt(_1)
         //
         // So we're going to try to recognize this pattern.
@@ -799,9 +799,7 @@ impl<'tcx> Body<'tcx> {
         }
 
         match rvalue {
-            Rvalue::NullaryOp(NullOp::UbChecks, _) => {
-                Some((tcx.sess.opts.debug_assertions as u128, targets))
-            }
+            Rvalue::NullaryOp(NullOp::UbChecks, _) => Some((tcx.sess.ub_checks() as u128, targets)),
             Rvalue::Use(Operand::Constant(constant)) => {
                 let bits = eval_mono_const(constant);
                 Some((bits, targets))

compiler/rustc_mir_transform/src/check_alignment.rs

@@ -16,7 +16,7 @@ impl<'tcx> MirPass<'tcx> for CheckAlignment {
         if sess.target.llvm_target == "i686-pc-windows-msvc" {
             return false;
         }
-        sess.opts.debug_assertions
+        sess.ub_checks()
     }
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {

compiler/rustc_mir_transform/src/instsimplify.rs

@@ -149,7 +149,7 @@ impl<'tcx> InstSimplifyContext<'tcx, '_> {
 
     fn simplify_ub_check(&self, source_info: &SourceInfo, rvalue: &mut Rvalue<'tcx>) {
         if let Rvalue::NullaryOp(NullOp::UbChecks, _) = *rvalue {
-            let const_ = Const::from_bool(self.tcx, self.tcx.sess.opts.debug_assertions);
+            let const_ = Const::from_bool(self.tcx, self.tcx.sess.ub_checks());
             let constant = ConstOperand { span: source_info.span, const_, user_ty: None };
             *rvalue = Rvalue::Use(Operand::Constant(Box::new(constant)));
         }

compiler/rustc_session/src/config/cfg.rs

@@ -212,6 +212,10 @@ pub(crate) fn default_configuration(sess: &Session) -> Cfg {
         ins_none!(sym::test);
     }
 
+    if sess.ub_checks() {
+        ins_none!(sym::ub_checks);
+    }
+
     ret
 }
 
@@ -367,6 +371,8 @@ impl CheckCfg {
 
         ins!(sym::test, no_values);
 
+        ins!(sym::ub_checks, no_values);
+
         ins!(sym::unix, no_values);
         ins!(sym::windows, no_values);
     }

compiler/rustc_session/src/options.rs

@@ -1992,6 +1992,9 @@ written to standard error output)"),
         "in diagnostics, use heuristics to shorten paths referring to items"),
     tune_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
         "select processor to schedule for (`rustc --print target-cpus` for details)"),
+    #[rustc_lint_opt_deny_field_access("use `Session::ub_checks` instead of this field")]
+    ub_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
+        "emit runtime checks for Undefined Behavior (default: -Cdebug-assertions)"),
     ui_testing: bool = (false, parse_bool, [UNTRACKED],
         "emit compiler diagnostics in a form suitable for UI testing (default: no)"),
     uninit_const_chunk_threshold: usize = (16, parse_number, [TRACKED],

compiler/rustc_session/src/session.rs

@@ -735,6 +735,10 @@ impl Session {
         self.opts.cg.overflow_checks.unwrap_or(self.opts.debug_assertions)
     }
 
+    pub fn ub_checks(&self) -> bool {
+        self.opts.unstable_opts.ub_checks.unwrap_or(self.opts.debug_assertions)
+    }
+
     pub fn relocation_model(&self) -> RelocModel {
         self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
     }

compiler/rustc_span/src/symbol.rs

@@ -514,6 +514,7 @@ symbols! {
         cfg_target_has_atomic_equal_alignment,
         cfg_target_thread_local,
         cfg_target_vendor,
+        cfg_ub_checks,
         cfg_version,
         cfi,
         cfi_encoding,

compiler/stable_mir/src/mir/body.rs

@@ -993,7 +993,7 @@ pub enum NullOp {
     AlignOf,
     /// Returns the offset of a field.
     OffsetOf(Vec<(VariantIdx, FieldIdx)>),
-    /// cfg!(debug_assertions), but at codegen time
+    /// cfg!(ub_checks), but at codegen time
     UbChecks,
 }
 

library/core/src/intrinsics.rs

@@ -2704,17 +2704,17 @@ pub const unsafe fn typed_swap<T>(x: *mut T, y: *mut T) {
 }
 
 /// Returns whether we should perform some UB-checking at runtime. This eventually evaluates to
-/// `cfg!(debug_assertions)`, but behaves different from `cfg!` when mixing crates built with different
-/// flags: if the crate has debug assertions enabled or carries the `#[rustc_preserve_ub_checks]`
+/// `cfg!(ub_checks)`, but behaves different from `cfg!` when mixing crates built with different
+/// flags: if the crate has UB checks enabled or carries the `#[rustc_preserve_ub_checks]`
 /// attribute, evaluation is delayed until monomorphization (or until the call gets inlined into
 /// a crate that does not delay evaluation further); otherwise it can happen any time.
 ///
-/// The common case here is a user program built with debug_assertions linked against the distributed
-/// sysroot which is built without debug_assertions but with `#[rustc_preserve_ub_checks]`.
+/// The common case here is a user program built with ub_checks linked against the distributed
+/// sysroot which is built without ub_checks but with `#[rustc_preserve_ub_checks]`.
 /// For code that gets monomorphized in the user crate (i.e., generic functions and functions with
-/// `#[inline]`), gating assertions on `ub_checks()` rather than `cfg!(debug_assertions)` means that
-/// assertions are enabled whenever the *user crate* has debug assertions enabled. However if the
-/// user has debug assertions disabled, the checks will still get optimized out. This intrinsic is
+/// `#[inline]`), gating assertions on `ub_checks()` rather than `cfg!(ub_checks)` means that
+/// assertions are enabled whenever the *user crate* has UB checks enabled. However if the
+/// user has UB checks disabled, the checks will still get optimized out. This intrinsic is
 /// primarily used by [`ub_checks::assert_unsafe_precondition`].
 #[rustc_const_unstable(feature = "const_ub_checks", issue = "none")]
 #[unstable(feature = "core_intrinsics", issue = "none")]

src/doc/unstable-book/src/compiler-flags/check-cfg.md

@@ -77,7 +77,7 @@ Those well known names and values follows the same stability as what they refer
 Well known names and values checking is always enabled as long as at least one
 `--check-cfg` argument is present.
 
-As of `2024-02-15T`, the list of known names is as follows:
+As of `2024-04-06T`, the list of known names is as follows:
 
 <!--- See CheckCfg::fill_well_known in compiler/rustc_session/src/config.rs -->
 
@@ -107,6 +107,7 @@ As of `2024-02-15T`, the list of known names is as follows:
  - `target_thread_local`
  - `target_vendor`
  - `test`
+ - `ub_checks`
  - `unix`
  - `windows`
 

src/doc/unstable-book/src/compiler-flags/ub-checks.md

@@ -0,0 +1,17 @@
+# `ub-checks`
+
+The tracking issue for this feature is: [#123499](https://github.com/rust-lang/rust/issues/123499).
+
+--------------------
+
+The `-Zub-checks` compiler flag enables additional runtime checks that detect some causes of Undefined Behavior at runtime.
+By default, `-Zub-checks` flag inherits the value of `-Cdebug-assertions`.
+
+All checks are generated on a best-effort basis; even if we have a check implemented for some cause of Undefined Behavior, it may be possible for the check to not fire.
+If a dependency is compiled with `-Zub-checks=no` but the final binary or library is compiled with `-Zub-checks=yes`, UB checks reached by the dependency are likely to be optimized out.
+
+When `-Zub-checks` detects UB, a non-unwinding panic is produced.
+That means that we will not unwind the stack and will not call any `Drop` impls, but we will execute the configured panic hook.
+We expect that unsafe code has been written which relies on code not unwinding which may have UB checks inserted.
+Ergo, an unwinding panic could easily turn works-as-intended UB into a much bigger problem.
+Calling the panic hook theoretically has the same implications, but we expect that the standard library panic hook will be stateless enough to be always called, and that if a user has configured a panic hook that the hook may be very helpful to debugging the detected UB.

tests/codegen/ub-checks.rs

@@ -0,0 +1,28 @@
+// With -Zub-checks=yes (enabled by default by -Cdebug-assertions=yes) we will produce a runtime
+// check that the index to slice::get_unchecked is in-bounds of the slice. That is tested for by
+// tests/ui/precondition-checks/out-of-bounds-get-unchecked.rs
+//
+// This test ensures that such a runtime check is *not* emitted when debug-assertions are enabled,
+// but ub-checks are explicitly disabled.
+
+//@ revisions: DEBUG NOCHECKS
+//@ [DEBUG] compile-flags:
+//@ [NOCHECKS] compile-flags: -Zub-checks=no
+//@ compile-flags: -O -Cdebug-assertions=yes
+
+#![crate_type = "lib"]
+
+use std::ops::Range;
+
+// CHECK-LABEL: @slice_get_unchecked(
+#[no_mangle]
+pub unsafe fn slice_get_unchecked(x: &[i32], i: usize) -> &i32 {
+    //    CHECK: icmp ult
+    // NOCHECKS: tail call void @llvm.assume
+    //    DEBUG: br i1
+    //    DEBUG: call core::panicking::panic_nounwind
+    //    DEBUG: unreachable
+    //    CHECK: getelementptr inbounds
+    //    CHECK: ret ptr
+    x.get_unchecked(i)
+}

tests/ui/check-cfg/allow-same-level.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `FALSE`
 LL | #[cfg(FALSE)]
    |       ^^^^^
    |
-   = help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
    = help: to expect this configuration use `--check-cfg=cfg(FALSE)`
    = note: see <https://doc.rust-lang.org/nightly/unstable-book/compiler-flags/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/cargo-feature.none.stderr

@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
-   = help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
    = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(tokio_unstable)");` to the top of a `build.rs`
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 

tests/ui/check-cfg/cargo-feature.some.stderr

@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
-   = help: expected names are: `CONFIG_NVME`, `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `CONFIG_NVME`, `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
    = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(tokio_unstable)");` to the top of a `build.rs`
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 

tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `value`
 LL | #[cfg(value)]
    |       ^^^^^
    |
-   = help: expected names are: `bar`, `bee`, `clippy`, `cow`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `bar`, `bee`, `clippy`, `cow`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
    = help: to expect this configuration use `--check-cfg=cfg(value)`
    = note: see <https://doc.rust-lang.org/nightly/unstable-book/compiler-flags/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `my_value`
 LL | #[cfg(my_value)]
    |       ^^^^^^^^
    |
-   = help: expected names are: `bar`, `clippy`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `bar`, `clippy`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
    = help: to expect this configuration use `--check-cfg=cfg(my_value)`
    = note: see <https://doc.rust-lang.org/nightly/unstable-book/compiler-flags/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default