bjoernager/rust
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Auto merge of #115025 - ouz-a:ouz_testing, r=lcnr

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Make subtyping explicit in MIR

This adds new mir-opt that pushes new `ProjectionElem` called `ProjectionElem::Subtype(T)` to `Rvalue` of a subtyped assignment so we can unsoundness issues like https://github.com/rust-lang/rust/issues/107205

Addresses https://github.com/rust-lang/rust/issues/112651

r? `@lcnr`
This commit is contained in:
bors 2023-10-03 10:02:52 +00:00
commit eb0f3ed59c
34 changed files with 282 additions and 65 deletions
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compiler/rustc_codegen_ssa/src/mir/place.rs
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@ -466,6 +466,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::ProjectionElem::OpaqueCast(ty) => {
bug!("encountered OpaqueCast({ty}) in codegen")
}
mir::ProjectionElem::Subtype(ty) => cg_base.project_type(bx, self.monomorphize(ty)),
mir::ProjectionElem::Index(index) => {
let index = &mir::Operand::Copy(mir::Place::from(index));
let index = self.codegen_operand(bx, index);