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Unify validity checks into a single query

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Previously, there were two queries to check whether a type allows the
0x01 or zeroed bitpattern.

I am planning on adding a further initness to check, truly uninit for
MaybeUninit, which would make this three queries. This seems overkill
for such a small feature, so this PR unifies them into one.
This commit is contained in:
Nilstrieb
2023-02-22 20:51:29 +00:00
parent b869e84e58
commit 025d2a147f
11 changed files with 89 additions and 67 deletions
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6
compiler/rustc_const_eval/src/util/might_permit_raw_init.rs
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@@ -1,7 +1,7 @@
use rustc_middle::ty::layout::{LayoutCx, LayoutError, LayoutOf, TyAndLayout};
use rustc_middle::ty::layout::{InitKind, LayoutCx, LayoutError, LayoutOf, TyAndLayout};
use rustc_middle::ty::{ParamEnv, ParamEnvAnd, Ty, TyCtxt};
use rustc_session::Limit;
use rustc_target::abi::{Abi, FieldsShape, InitKind, Scalar, Variants};
use rustc_target::abi::{Abi, FieldsShape, Scalar, Variants};
use crate::const_eval::{CheckAlignment, CompileTimeInterpreter};
use crate::interpret::{InterpCx, MemoryKind, OpTy};
@@ -20,8 +20,8 @@ use crate::interpret::{InterpCx, MemoryKind, OpTy};
/// to the full uninit check).
pub fn might_permit_raw_init<'tcx>(
tcx: TyCtxt<'tcx>,
param_env_and_ty: ParamEnvAnd<'tcx, Ty<'tcx>>,
kind: InitKind,
param_env_and_ty: ParamEnvAnd<'tcx, Ty<'tcx>>,
) -> Result<bool, LayoutError<'tcx>> {
if tcx.sess.opts.unstable_opts.strict_init_checks {
might_permit_raw_init_strict(tcx.layout_of(param_env_and_ty)?, tcx, kind)