Unify all validity check intrinsics

Also merges the inhabitedness check into the query to further unify the
code paths.

compiler/rustc_middle/src/query/keys.rs

@@ -4,7 +4,7 @@ use crate::infer::canonical::Canonical;
 use crate::mir;
 use crate::traits;
 use crate::ty::fast_reject::SimplifiedType;
-use crate::ty::layout::{InitKind, TyAndLayout};
+use crate::ty::layout::{TyAndLayout, ValidityRequirement};
 use crate::ty::subst::{GenericArg, SubstsRef};
 use crate::ty::{self, Ty, TyCtxt};
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
@@ -698,7 +698,7 @@ impl Key for HirId {
     }
 }
 
-impl<'tcx> Key for (InitKind, ty::ParamEnvAnd<'tcx, Ty<'tcx>>) {
+impl<'tcx> Key for (ValidityRequirement, ty::ParamEnvAnd<'tcx, Ty<'tcx>>) {
     type CacheSelector = DefaultCacheSelector<Self>;
 
     // Just forward to `Ty<'tcx>`

compiler/rustc_middle/src/query/mod.rs

@@ -2173,8 +2173,8 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    query check_validity_of_init(key: (InitKind, ty::ParamEnvAnd<'tcx, Ty<'tcx>>)) -> Result<bool, ty::layout::LayoutError<'tcx>> {
-        desc { "checking to see if `{}` permits being left {}", key.1.value, key.0 }
+    query check_validity_requirement(key: (ValidityRequirement, ty::ParamEnvAnd<'tcx, Ty<'tcx>>)) -> Result<bool, ty::layout::LayoutError<'tcx>> {
+        desc { "checking validity requirement for `{}`: {}", key.1.value, key.0 }
     }
 
     query compare_impl_const(

compiler/rustc_middle/src/ty/layout.rs

@@ -7,6 +7,7 @@ use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_index::vec::Idx;
 use rustc_session::config::OptLevel;
+use rustc_span::symbol::{sym, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::call::FnAbi;
 use rustc_target::abi::*;
@@ -172,16 +173,29 @@ pub const MAX_SIMD_LANES: u64 = 1 << 0xF;
 /// Used in `might_permit_raw_init` to indicate the kind of initialisation
 /// that is checked to be valid
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable)]
-pub enum InitKind {
+pub enum ValidityRequirement {
+    Inhabited,
     Zero,
     UninitMitigated0x01Fill,
 }
 
-impl fmt::Display for InitKind {
+impl ValidityRequirement {
+    pub fn from_intrinsic(intrinsic: Symbol) -> Option<Self> {
+        match intrinsic {
+            sym::assert_inhabited => Some(Self::Inhabited),
+            sym::assert_zero_valid => Some(Self::Zero),
+            sym::assert_mem_uninitialized_valid => Some(Self::UninitMitigated0x01Fill),
+            _ => None,
+        }
+    }
+}
+
+impl fmt::Display for ValidityRequirement {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            Self::Zero => f.write_str("zeroed"),
-            Self::UninitMitigated0x01Fill => f.write_str("filled with 0x01"),
+            Self::Inhabited => f.write_str("is inhabited"),
+            Self::Zero => f.write_str("allows being left zeroed"),
+            Self::UninitMitigated0x01Fill => f.write_str("allows being filled with 0x01"),
         }
     }
 }

compiler/rustc_middle/src/ty/query.rs

@@ -32,7 +32,7 @@ use crate::traits::specialization_graph;
 use crate::traits::{self, ImplSource};
 use crate::ty::context::TyCtxtFeed;
 use crate::ty::fast_reject::SimplifiedType;
-use crate::ty::layout::InitKind;
+use crate::ty::layout::ValidityRequirement;
 use crate::ty::subst::{GenericArg, SubstsRef};
 use crate::ty::util::AlwaysRequiresDrop;
 use crate::ty::GeneratorDiagnosticData;