238 lines
7.4 KiB
Rust
238 lines
7.4 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-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_hir;
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extern crate rustc_middle;
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extern crate rustc_smir;
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use rustc_hir::def::DefKind;
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use rustc_middle::ty::TyCtxt;
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use rustc_smir::{
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rustc_internal,
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stable_mir::{self, fold::Foldable},
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};
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use std::assert_matches::assert_matches;
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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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// 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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assert_eq!(stable_mir::entry_fn(), None);
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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!(get_item(tcx, &items, (DefKind::Fn, "foo::bar")).is_some());
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// Find the `std` crate.
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assert!(stable_mir::find_crate("std").is_some());
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let bar = get_item(tcx, &items, (DefKind::Fn, "bar")).unwrap();
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let body = bar.body();
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assert_eq!(body.locals.len(), 2);
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assert_eq!(body.blocks.len(), 1);
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let block = &body.blocks[0];
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assert_eq!(block.statements.len(), 1);
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match &block.statements[0] {
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stable_mir::mir::Statement::Assign(..) => {}
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other => panic!("{other:?}"),
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}
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match &block.terminator {
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stable_mir::mir::Terminator::Return => {}
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other => panic!("{other:?}"),
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}
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let foo_bar = get_item(tcx, &items, (DefKind::Fn, "foo_bar")).unwrap();
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let body = foo_bar.body();
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assert_eq!(body.locals.len(), 7);
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assert_eq!(body.blocks.len(), 4);
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let block = &body.blocks[0];
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match &block.terminator {
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stable_mir::mir::Terminator::Call { .. } => {}
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other => panic!("{other:?}"),
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}
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let types = get_item(tcx, &items, (DefKind::Fn, "types")).unwrap();
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let body = types.body();
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assert_eq!(body.locals.len(), 6);
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assert_matches!(
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body.locals[0].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Bool)
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);
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assert_matches!(
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body.locals[1].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Bool)
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);
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assert_matches!(
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body.locals[2].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Char)
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);
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assert_matches!(
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body.locals[3].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Int(stable_mir::ty::IntTy::I32))
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);
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assert_matches!(
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body.locals[4].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Uint(stable_mir::ty::UintTy::U64))
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);
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assert_matches!(
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body.locals[5].kind(),
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::Float(
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stable_mir::ty::FloatTy::F64
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))
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);
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let drop = get_item(tcx, &items, (DefKind::Fn, "drop")).unwrap();
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let body = drop.body();
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assert_eq!(body.blocks.len(), 2);
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let block = &body.blocks[0];
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match &block.terminator {
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stable_mir::mir::Terminator::Drop { .. } => {}
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other => panic!("{other:?}"),
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}
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let assert = get_item(tcx, &items, (DefKind::Fn, "assert")).unwrap();
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let body = assert.body();
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assert_eq!(body.blocks.len(), 2);
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let block = &body.blocks[0];
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match &block.terminator {
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stable_mir::mir::Terminator::Assert { .. } => {}
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other => panic!("{other:?}"),
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}
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let monomorphic = get_item(tcx, &items, (DefKind::Fn, "monomorphic")).unwrap();
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for block in monomorphic.body().blocks {
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match &block.terminator {
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stable_mir::mir::Terminator::Call { func, .. } => match func {
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stable_mir::mir::Operand::Constant(c) => match &c.literal.literal {
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stable_mir::ty::ConstantKind::Allocated(alloc) => {
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assert!(alloc.bytes.is_empty());
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match c.literal.ty.kind() {
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stable_mir::ty::TyKind::RigidTy(stable_mir::ty::RigidTy::FnDef(
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def,
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mut args,
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)) => {
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let func = def.body();
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match func.locals[1]
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.fold(&mut args)
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.continue_value()
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.unwrap()
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.kind()
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{
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stable_mir::ty::TyKind::RigidTy(
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stable_mir::ty::RigidTy::Uint(_),
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) => {}
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stable_mir::ty::TyKind::RigidTy(
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stable_mir::ty::RigidTy::Tuple(_),
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) => {}
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other => panic!("{other:?}"),
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}
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}
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other => panic!("{other:?}"),
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}
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}
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other => panic!("{other:?}"),
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},
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other => panic!("{other:?}"),
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},
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stable_mir::mir::Terminator::Return => {}
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other => panic!("{other:?}"),
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}
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}
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let foo_const = get_item(tcx, &items, (DefKind::Const, "FOO")).unwrap();
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// Ensure we don't panic trying to get the body of a constant.
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foo_const.body();
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ControlFlow::Continue(())
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}
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// Use internal API to find a function in a crate.
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fn get_item<'a>(
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tcx: TyCtxt,
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items: &'a stable_mir::CrateItems,
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item: (DefKind, &str),
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) -> Option<&'a stable_mir::CrateItem> {
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items.iter().find(|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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/// 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 = "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 const FOO: u32 = 1 + 2;
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fn generic<T, const U: usize>(t: T) -> [(); U] {{
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_ = t;
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[(); U]
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}}
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pub fn monomorphic() {{
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generic::<(), 5>(());
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generic::<u32, 0>(45);
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}}
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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 bar(x: i32) -> i32 {{
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x
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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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pub fn types(b: bool, _: char, _: i32, _: u64, _: f64) -> bool {{
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b
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}}
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pub fn drop(_: String) {{}}
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pub fn assert(x: i32) -> i32 {{
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x + 1
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}}"#
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)?;
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Ok(())
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}
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