mirror of https://github.com/rust-lang/rust
114 lines
3.5 KiB
Rust
114 lines
3.5 KiB
Rust
//@ run-pass
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//! Test that users are able to use stable mir APIs to retrieve monomorphized types, and that
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//! we have an error handling for trying to instantiate types with incorrect arguments.
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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 stable_mir;
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use rustc_smir::rustc_internal;
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use stable_mir::ty::{RigidTy, TyKind, Ty, };
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use stable_mir::mir::{Body, MirVisitor, FieldIdx, Place, ProjectionElem, visit::{Location,
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PlaceContext}};
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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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/// This function uses the Stable MIR APIs to get information about the test crate.
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fn test_stable_mir() -> ControlFlow<()> {
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let main_fn = stable_mir::entry_fn();
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let body = main_fn.unwrap().body();
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let mut visitor = PlaceVisitor{ body: &body, tested: false};
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visitor.visit_body(&body);
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assert!(visitor.tested);
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ControlFlow::Continue(())
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}
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struct PlaceVisitor<'a> {
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body: &'a Body,
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/// Used to ensure that the test was reachable. Otherwise this test would vacuously succeed.
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tested: bool,
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}
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/// Check that `wrapper.inner` place projection can be correctly interpreted.
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/// Ensure that instantiation is correct.
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fn check_tys(local_ty: Ty, idx: FieldIdx, expected_ty: Ty) {
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let TyKind::RigidTy(RigidTy::Adt(def, args)) = local_ty.kind() else { unreachable!() };
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assert_eq!(def.ty_with_args(&args), local_ty);
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let field_def = &def.variants_iter().next().unwrap().fields()[idx];
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let field_ty = field_def.ty_with_args(&args);
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assert_eq!(field_ty, expected_ty);
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// Check that the generic version is different than the instantiated one.
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let field_ty_gen = field_def.ty();
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assert_ne!(field_ty_gen, field_ty);
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}
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impl<'a> MirVisitor for PlaceVisitor<'a> {
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fn visit_place(&mut self, place: &Place, _ptx: PlaceContext, _loc: Location) {
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let start_ty = self.body.locals()[place.local].ty;
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match place.projection.as_slice() {
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[ProjectionElem::Field(idx, ty)] => {
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check_tys(start_ty, *idx, *ty);
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self.tested = true;
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}
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_ => {}
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}
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}
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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 = "ty_fold_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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"-Cpanic=abort".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!(args, test_stable_mir).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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struct Wrapper<T: Default> {{
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pub inner: T
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}}
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impl<T: Default> Wrapper<T> {{
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pub fn new() -> Wrapper<T> {{
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Wrapper {{ inner: T::default() }}
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}}
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}}
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fn main() {{
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let wrapper = Wrapper::<u8>::new();
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let _inner = wrapper.inner;
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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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