Use constant eval to do strict validity checks

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -104,7 +104,7 @@ pub struct CompileTimeInterpreter<'mir, 'tcx> {
 }
 
 impl<'mir, 'tcx> CompileTimeInterpreter<'mir, 'tcx> {
-    pub(super) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self {
+    pub(crate) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self {
         CompileTimeInterpreter {
             steps_remaining: const_eval_limit.0,
             stack: Vec::new(),

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -15,7 +15,7 @@ use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_span::symbol::{sym, Symbol};
-use rustc_target::abi::{Abi, Align, InitKind, Primitive, Size};
+use rustc_target::abi::{Abi, Align, Primitive, Size};
 
 use super::{
     util::ensure_monomorphic_enough, CheckInAllocMsg, ImmTy, InterpCx, Machine, OpTy, PlaceTy,
@@ -413,35 +413,33 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         ),
                     )?;
                 }
-                if intrinsic_name == sym::assert_zero_valid
-                    && !layout.might_permit_raw_init(
-                        self,
-                        InitKind::Zero,
-                        self.tcx.sess.opts.unstable_opts.strict_init_checks,
-                    )
-                {
-                    M::abort(
-                        self,
-                        format!(
-                            "aborted execution: attempted to zero-initialize type `{}`, which is invalid",
-                            ty
-                        ),
-                    )?;
+
+                if intrinsic_name == sym::assert_zero_valid {
+                    let should_panic = !self.tcx.permits_zero_init(layout);
+
+                    if should_panic {
+                        M::abort(
+                            self,
+                            format!(
+                                "aborted execution: attempted to zero-initialize type `{}`, which is invalid",
+                                ty
+                            ),
+                        )?;
+                    }
                 }
-                if intrinsic_name == sym::assert_uninit_valid
-                    && !layout.might_permit_raw_init(
-                        self,
-                        InitKind::Uninit,
-                        self.tcx.sess.opts.unstable_opts.strict_init_checks,
-                    )
-                {
-                    M::abort(
-                        self,
-                        format!(
-                            "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
-                            ty
-                        ),
-                    )?;
+
+                if intrinsic_name == sym::assert_uninit_valid {
+                    let should_panic = !self.tcx.permits_uninit_init(layout);
+
+                    if should_panic {
+                        M::abort(
+                            self,
+                            format!(
+                                "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
+                                ty
+                            ),
+                        )?;
+                    }
                 }
             }
             sym::simd_insert => {

compiler/rustc_const_eval/src/lib.rs

@@ -33,11 +33,13 @@ extern crate rustc_middle;
 pub mod const_eval;
 mod errors;
 pub mod interpret;
+mod might_permit_raw_init;
 pub mod transform;
 pub mod util;
 
 use rustc_middle::ty;
 use rustc_middle::ty::query::Providers;
+use rustc_target::abi::InitKind;
 
 pub fn provide(providers: &mut Providers) {
     const_eval::provide(providers);
@@ -59,4 +61,8 @@ pub fn provide(providers: &mut Providers) {
         let (param_env, value) = param_env_and_value.into_parts();
         const_eval::deref_mir_constant(tcx, param_env, value)
     };
+    providers.permits_uninit_init =
+        |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Uninit);
+    providers.permits_zero_init =
+        |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Zero);
 }

compiler/rustc_const_eval/src/might_permit_raw_init.rs

@@ -0,0 +1,40 @@
+use crate::const_eval::CompileTimeInterpreter;
+use crate::interpret::{InterpCx, MemoryKind, OpTy};
+use rustc_middle::ty::layout::LayoutCx;
+use rustc_middle::ty::{layout::TyAndLayout, ParamEnv, TyCtxt};
+use rustc_session::Limit;
+use rustc_target::abi::InitKind;
+
+pub fn might_permit_raw_init<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    ty: TyAndLayout<'tcx>,
+    kind: InitKind,
+) -> bool {
+    let strict = tcx.sess.opts.unstable_opts.strict_init_checks;
+
+    if strict {
+        let machine = CompileTimeInterpreter::new(Limit::new(0), false);
+
+        let mut cx = InterpCx::new(tcx, rustc_span::DUMMY_SP, ParamEnv::reveal_all(), machine);
+
+        let allocated = cx
+            .allocate(ty, MemoryKind::Machine(crate::const_eval::MemoryKind::Heap))
+            .expect("OOM: failed to allocate for uninit check");
+
+        if kind == InitKind::Zero {
+            cx.write_bytes_ptr(
+                allocated.ptr,
+                std::iter::repeat(0_u8).take(ty.layout.size().bytes_usize()),
+            )
+            .expect("failed to write bytes for zero valid check");
+        }
+
+        let ot: OpTy<'_, _> = allocated.into();
+
+        // Assume that if it failed, it's a validation failure.
+        cx.validate_operand(&ot).is_ok()
+    } else {
+        let layout_cx = LayoutCx { tcx, param_env: ParamEnv::reveal_all() };
+        ty.might_permit_raw_init(&layout_cx, kind)
+    }
+}