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safe transmute: revise safety analysis

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Migrate to a simplified safety analysis that does not use visibility.

Closes https://github.com/rust-lang/project-safe-transmute/issues/15
This commit is contained in:
Jack Wrenn
2024-02-26 16:49:25 +00:00
parent 9afdb8d1d5
commit 23ab1bda92
127 changed files with 1387 additions and 1948 deletions
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7
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
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@@ -310,8 +310,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
.collect(),
Condition::IfTransmutable { src, dst } => {
let trait_def_id = obligation.predicate.def_id();
let scope = predicate.trait_ref.args.type_at(2);
let assume_const = predicate.trait_ref.args.const_at(3);
let assume_const = predicate.trait_ref.args.const_at(2);
let make_obl = |from_ty, to_ty| {
let trait_ref1 = ty::TraitRef::new(
tcx,
@@ -319,7 +318,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
[
ty::GenericArg::from(to_ty),
ty::GenericArg::from(from_ty),
ty::GenericArg::from(scope),
ty::GenericArg::from(assume_const),
],
);
@@ -355,7 +353,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let Some(assume) = rustc_transmute::Assume::from_const(
self.infcx.tcx,
obligation.param_env,
predicate.trait_ref.args.const_at(3),
predicate.trait_ref.args.const_at(2),
) else {
return Err(Unimplemented);
};
@@ -367,7 +365,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let maybe_transmutable = transmute_env.is_transmutable(
obligation.cause.clone(),
rustc_transmute::Types { dst, src },
predicate.trait_ref.args.type_at(2),
assume,
);