105 lines
3.0 KiB
Rust
105 lines
3.0 KiB
Rust
// run-pass
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// Test that users are able to use stable mir APIs to retrieve information of the current crate
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// ignore-stage-1
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// ignore-cross-compile
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// ignore-remote
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#![feature(rustc_private)]
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extern crate rustc_driver;
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extern crate rustc_hir;
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extern crate rustc_interface;
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extern crate rustc_middle;
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extern crate rustc_smir;
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use rustc_driver::{Callbacks, Compilation, RunCompiler};
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use rustc_hir::def::DefKind;
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use rustc_interface::{interface, Queries};
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use rustc_middle::ty::TyCtxt;
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use rustc_smir::{rustc_internal, stable_mir};
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use std::io::Write;
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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<'_>) {
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// Get the local crate using stable_mir API.
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let local = stable_mir::local_crate();
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assert_eq!(&local.name, CRATE_NAME);
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// Find items in the local crate.
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let items = stable_mir::all_local_items();
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assert!(has_item(tcx, &items, (DefKind::Fn, "foo_bar")));
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assert!(has_item(tcx, &items, (DefKind::Fn, "foo::bar")));
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// Find the `std` crate.
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assert!(stable_mir::find_crate("std").is_some());
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}
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// Use internal API to find a function in a crate.
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fn has_item(tcx: TyCtxt, items: &stable_mir::CrateItems, item: (DefKind, &str)) -> bool {
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items.iter().any(|crate_item| {
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let def_id = rustc_internal::item_def_id(crate_item);
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tcx.def_kind(def_id) == item.0 && tcx.def_path_str(def_id) == item.1
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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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/// It will invoke the compiler using a custom Callback implementation, which will
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/// invoke Stable MIR APIs after the compiler has finished its analysis.
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fn main() {
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let path = "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_driver::catch_fatal_errors(|| {
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RunCompiler::new(&args, &mut SMirCalls {}).run().unwrap();
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})
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.unwrap();
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}
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struct SMirCalls {}
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impl Callbacks for SMirCalls {
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/// Called after analysis. Return value instructs the compiler whether to
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/// continue the compilation afterwards (defaults to `Compilation::Continue`)
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fn after_analysis<'tcx>(
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&mut self,
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_compiler: &interface::Compiler,
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queries: &'tcx Queries<'tcx>,
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) -> Compilation {
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queries.global_ctxt().unwrap().enter(|tcx| {
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test_stable_mir(tcx);
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});
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// No need to keep going.
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Compilation::Stop
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}
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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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mod foo {{
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pub fn bar(i: i32) -> i64 {{
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i as i64
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}}
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}}
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pub fn foo_bar(x: i32, y: i32) -> i64 {{
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let x_64 = foo::bar(x);
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let y_64 = foo::bar(y);
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x_64.wrapping_add(y_64)
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}}"#
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)?;
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Ok(())
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}
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