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9aace67235
The internal function was unsound, it could cause UB in rare cases where the user inadvertly stored the returned object in a location that could outlive the TyCtxt. In order to make it safe, we now take a type context as an argument to the internal fn, and we ensure that interned items are lifted using the provided context. Thus, this change ensures that the compiler can properly enforce that the object does not outlive the type context it was lifted to.
65 lines
1.7 KiB
Rust
65 lines
1.7 KiB
Rust
// run-pass
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//! Test that users are able to use retrieve internal constructs from stable ones to help with
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//! the migration.
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// ignore-stage1
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// ignore-cross-compile
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// ignore-remote
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// ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
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// edition: 2021
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#![feature(rustc_private)]
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#![feature(assert_matches)]
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#![feature(control_flow_enum)]
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#[macro_use]
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extern crate rustc_smir;
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extern crate rustc_driver;
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extern crate rustc_interface;
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extern crate rustc_middle;
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extern crate stable_mir;
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use rustc_middle::ty::TyCtxt;
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use rustc_smir::rustc_internal;
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use std::io::Write;
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use std::ops::ControlFlow;
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const CRATE_NAME: &str = "input";
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fn test_translation(tcx: TyCtxt<'_>) -> ControlFlow<()> {
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let main_fn = stable_mir::entry_fn().unwrap();
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let body = main_fn.body();
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let orig_ty = body.locals()[0].ty;
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let rustc_ty = rustc_internal::internal(tcx, &orig_ty);
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assert!(rustc_ty.is_unit());
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ControlFlow::Continue(())
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}
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/// This test will generate and analyze a dummy crate using the stable mir.
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/// For that, it will first write the dummy crate into a file.
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/// Then it will create a `StableMir` using custom arguments and then
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/// it will run the compiler.
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fn main() {
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let path = "internal_input.rs";
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generate_input(&path).unwrap();
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let args = vec![
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"rustc".to_string(),
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"--crate-name".to_string(),
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CRATE_NAME.to_string(),
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path.to_string(),
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];
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run_with_tcx!(args, test_translation).unwrap();
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}
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fn generate_input(path: &str) -> std::io::Result<()> {
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let mut file = std::fs::File::create(path)?;
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write!(
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file,
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r#"
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pub fn main() {{
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}}
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"#
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)?;
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Ok(())
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}
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