92 lines
2.5 KiB
Rust
92 lines
2.5 KiB
Rust
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// run-pass
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// Test that users are able to use stable mir APIs to retrieve monomorphized instances
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// ignore-stage1
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// ignore-cross-compile
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// ignore-remote
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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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extern crate rustc_middle;
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extern crate rustc_smir;
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extern crate stable_mir;
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use rustc_middle::ty::TyCtxt;
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use stable_mir::*;
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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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/// This function uses the Stable MIR APIs to get information about the test crate.
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fn test_stable_mir(_tcx: TyCtxt<'_>) -> ControlFlow<()> {
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let items = stable_mir::all_local_items();
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// Get all items and split generic vs monomorphic items.
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let (generic, mono) : (Vec<_>, Vec<_>) = items.into_iter().partition(|item| {
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item.requires_monomorphization()
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});
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assert_eq!(mono.len(), 3, "Expected 2 mono functions and one constant");
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assert_eq!(generic.len(), 2, "Expected 2 generic functions");
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// For all monomorphic items, get the correspondent instances.
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let instances = mono.iter().filter_map(|item| {
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mir::mono::Instance::try_from(*item).ok()
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}).collect::<Vec<mir::mono::Instance>>();
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assert_eq!(instances.len(), mono.len());
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// For all generic items, try_from should fail.
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assert!(generic.iter().all(|item| mir::mono::Instance::try_from(*item).is_err()));
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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 = "instance_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-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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rustc_internal::StableMir::new(args, test_stable_mir).run().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 ty_param<T>(t: &T) -> T where T: Clone {{
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t.clone()
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}}
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pub fn const_param<const LEN: usize>(a: [bool; LEN]) -> bool {{
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LEN > 0 && a[0]
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}}
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pub fn monomorphic() {{
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}}
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pub mod foo {{
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pub fn bar_mono(i: i32) -> i64 {{
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i as i64
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}}
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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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