mirror of https://github.com/rust-lang/rust
124 lines
3.9 KiB
Rust
124 lines
3.9 KiB
Rust
//@ run-pass
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//! Test that users are able to retrieve information about trait declarations and implementations.
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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::CrateDef;
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use std::collections::HashSet;
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use std::io::Write;
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use std::ops::ControlFlow;
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const CRATE_NAME: &str = "trait_test";
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/// This function uses the Stable MIR APIs to get information about the test crate.
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fn test_traits() -> ControlFlow<()> {
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let local_crate = stable_mir::local_crate();
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let local_traits = local_crate.trait_decls();
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assert_eq!(local_traits.len(), 1, "Expected `Max` trait, but found {:?}", local_traits);
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assert_eq!(&local_traits[0].name(), "Max");
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let local_impls = local_crate.trait_impls();
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let impl_names = local_impls.iter().map(|trait_impl| trait_impl.name()).collect::<HashSet<_>>();
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assert_impl(&impl_names, "<Positive as Max>");
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assert_impl(&impl_names, "<Positive as std::marker::Copy>");
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assert_impl(&impl_names, "<Positive as std::clone::Clone>");
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assert_impl(&impl_names, "<Positive as std::fmt::Debug>");
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assert_impl(&impl_names, "<Positive as std::cmp::PartialEq>");
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assert_impl(&impl_names, "<Positive as std::cmp::Eq>");
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assert_impl(&impl_names, "<Positive as std::convert::TryFrom<u64>>");
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assert_impl(&impl_names, "<u64 as Max>");
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assert_impl(&impl_names, "<impl std::convert::From<Positive> for u64>");
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let all_traits = stable_mir::all_trait_decls();
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assert!(all_traits.len() > local_traits.len());
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assert!(
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local_traits.iter().all(|t| all_traits.contains(t)),
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"Local: {local_traits:#?}, All: {all_traits:#?}"
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);
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let all_impls = stable_mir::all_trait_impls();
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assert!(all_impls.len() > local_impls.len());
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assert!(
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local_impls.iter().all(|t| all_impls.contains(t)),
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"Local: {local_impls:#?}, All: {all_impls:#?}"
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);
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ControlFlow::Continue(())
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}
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fn assert_impl(impl_names: &HashSet<String>, target: &str) {
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assert!(
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impl_names.contains(target),
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"Failed to find `{target}`. Implementations available: {impl_names:?}",
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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 = "trait_queries.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-type=lib".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_traits).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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use std::convert::TryFrom;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct Positive(u64);
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impl TryFrom<u64> for Positive {{
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type Error = ();
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fn try_from(val: u64) -> Result<Positive, Self::Error> {{
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if val > 0 {{ Ok(Positive(val)) }} else {{ Err(()) }}
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}}
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}}
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impl From<Positive> for u64 {{
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fn from(val: Positive) -> u64 {{ val.0 }}
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}}
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pub trait Max {{
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fn is_max(&self) -> bool;
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}}
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impl Max for u64 {{
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fn is_max(&self) -> bool {{ *self == u64::MAX }}
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}}
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impl Max for Positive {{
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fn is_max(&self) -> bool {{ self.0.is_max() }}
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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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