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//@ run-pass
//! Test that users are able to retrieve information about trait declarations and implementations.
//@ ignore-stage1
//@ ignore-cross-compile
//@ ignore-remote
//@ ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
//@ edition: 2021
#![feature(rustc_private)]
#![feature(assert_matches)]
#![feature(control_flow_enum)]
#[macro_use]
extern crate rustc_smir;
extern crate rustc_driver;
extern crate rustc_interface;
extern crate stable_mir;
use rustc_smir::rustc_internal;
use stable_mir::CrateDef;
use std::collections::HashSet;
use std::io::Write;
use std::ops::ControlFlow;
const CRATE_NAME: &str = "trait_test";
/// This function uses the Stable MIR APIs to get information about the test crate.
fn test_traits() -> ControlFlow<()> {
let local_crate = stable_mir::local_crate();
let local_traits = local_crate.trait_decls();
assert_eq!(local_traits.len(), 1, "Expected `Max` trait, but found {:?}", local_traits);
assert_eq!(&local_traits[0].name(), "Max");
let local_impls = local_crate.trait_impls();
let impl_names = local_impls.iter().map(|trait_impl| trait_impl.name()).collect::<HashSet<_>>();
assert_impl(&impl_names, "<Positive as Max>");
assert_impl(&impl_names, "<Positive as std::marker::Copy>");
assert_impl(&impl_names, "<Positive as std::clone::Clone>");
assert_impl(&impl_names, "<Positive as std::fmt::Debug>");
assert_impl(&impl_names, "<Positive as std::cmp::PartialEq>");
assert_impl(&impl_names, "<Positive as std::cmp::Eq>");
assert_impl(&impl_names, "<Positive as std::convert::TryFrom<u64>>");
assert_impl(&impl_names, "<u64 as Max>");
assert_impl(&impl_names, "<impl std::convert::From<Positive> for u64>");
let all_traits = stable_mir::all_trait_decls();
assert!(all_traits.len() > local_traits.len());
assert!(
local_traits.iter().all(|t| all_traits.contains(t)),
"Local: {local_traits:#?}, All: {all_traits:#?}"
);
let all_impls = stable_mir::all_trait_impls();
assert!(all_impls.len() > local_impls.len());
assert!(
local_impls.iter().all(|t| all_impls.contains(t)),
"Local: {local_impls:#?}, All: {all_impls:#?}"
);
ControlFlow::Continue(())
}
fn assert_impl(impl_names: &HashSet<String>, target: &str) {
assert!(
impl_names.contains(target),
"Failed to find `{target}`. Implementations available: {impl_names:?}",
);
}
/// This test will generate and analyze a dummy crate using the stable mir.
/// For that, it will first write the dummy crate into a file.
/// Then it will create a `StableMir` using custom arguments and then
/// it will run the compiler.
fn main() {
let path = "trait_queries.rs";
generate_input(&path).unwrap();
let args = vec![
"rustc".to_string(),
"--crate-type=lib".to_string(),
"--crate-name".to_string(),
CRATE_NAME.to_string(),
path.to_string(),
];
run!(args, test_traits).unwrap();
}
fn generate_input(path: &str) -> std::io::Result<()> {
let mut file = std::fs::File::create(path)?;
write!(
file,
r#"
use std::convert::TryFrom;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct Positive(u64);
impl TryFrom<u64> for Positive {{
type Error = ();
fn try_from(val: u64) -> Result<Positive, Self::Error> {{
if val > 0 {{ Ok(Positive(val)) }} else {{ Err(()) }}
}}
}}
impl From<Positive> for u64 {{
fn from(val: Positive) -> u64 {{ val.0 }}
}}
pub trait Max {{
fn is_max(&self) -> bool;
}}
impl Max for u64 {{
fn is_max(&self) -> bool {{ *self == u64::MAX }}
}}
impl Max for Positive {{
fn is_max(&self) -> bool {{ self.0.is_max() }}
}}
"#
)?;
Ok(())
}
|
