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safe transmute: use Assume struct to provide analysis options

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This was left as a TODO in #92268, and brings the trait more in
line with what was defined in MCP411.

`Assume::visibility` has been renamed to `Assume::safety`, as
library safety is what's actually being assumed; visibility is
just the mechanism by which it is currently checked (this may
change).

ref: https://github.com/rust-lang/compiler-team/issues/411
ref: https://github.com/rust-lang/rust/issues/99571
This commit is contained in:
Jack Wrenn 2022-08-18 19:39:14 +00:00
parent e0dc8d7801
commit f46fffc276
77 changed files with 1321 additions and 721 deletions
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20
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
View file

@ -279,29 +279,17 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let predicate = obligation.predicate;
let type_at = |i| predicate.map_bound(|p| p.trait_ref.substs.type_at(i));
let bool_at = |i| {
predicate
.skip_binder()
.trait_ref
.substs
.const_at(i)
.try_eval_bool(self.tcx(), obligation.param_env)
.unwrap_or(true)
};
let const_at = |i| predicate.skip_binder().trait_ref.substs.const_at(i);
let src_and_dst = predicate.map_bound(|p| rustc_transmute::Types {
src: p.trait_ref.substs.type_at(1),
dst: p.trait_ref.substs.type_at(0),
src: p.trait_ref.substs.type_at(1),
});
let scope = type_at(2).skip_binder();
let assume = rustc_transmute::Assume {
alignment: bool_at(3),
lifetimes: bool_at(4),
validity: bool_at(5),
visibility: bool_at(6),
};
let assume =
rustc_transmute::Assume::from_const(self.infcx.tcx, obligation.param_env, const_at(3));
let cause = obligation.cause.clone();