mirror of https://github.com/rust-lang/rust
143 lines
4.6 KiB
Rust
143 lines
4.6 KiB
Rust
//@ run-pass
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//! Test that users are able to use stable mir APIs to retrieve information about crate definitions.
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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 std::assert_matches::assert_matches;
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use mir::{mono::Instance, TerminatorKind::*};
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use stable_mir::mir::mono::InstanceKind;
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use rustc_smir::rustc_internal;
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use stable_mir::ty::{RigidTy, TyKind, Ty, UintTy};
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use stable_mir::*;
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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() -> ControlFlow<()> {
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let entry = stable_mir::entry_fn().unwrap();
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let main_fn = Instance::try_from(entry).unwrap();
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assert_eq!(main_fn.name(), "main");
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assert_eq!(main_fn.trimmed_name(), "main");
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let instances = get_instances(main_fn.body().unwrap());
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assert_eq!(instances.len(), 3);
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test_fn(instances[0], "from_u32", "std::char::from_u32", "core");
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test_fn(instances[1], "Vec::<u8>::new", "std::vec::Vec::<u8>::new", "alloc");
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test_fn(instances[2], "ctpop::<u8>", "std::intrinsics::ctpop::<u8>", "core");
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test_vec_new(instances[1]);
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ControlFlow::Continue(())
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}
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fn test_fn(instance: Instance, expected_trimmed: &str, expected_qualified: &str, krate: &str) {
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let trimmed = instance.trimmed_name();
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let qualified = instance.name();
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assert_eq!(&trimmed, expected_trimmed);
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assert_eq!(&qualified, expected_qualified);
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if instance.kind == InstanceKind::Intrinsic {
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let intrinsic = instance.intrinsic_name().unwrap();
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let (trimmed_base, _trimmed_args) = trimmed.split_once("::").unwrap();
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assert_eq!(intrinsic, trimmed_base);
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return;
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}
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assert!(instance.intrinsic_name().is_none());
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let item = CrateItem::try_from(instance).unwrap();
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let trimmed = item.trimmed_name();
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let qualified = item.name();
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assert_eq!(trimmed, expected_trimmed.replace("u8", "T"));
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assert_eq!(qualified, expected_qualified.replace("u8", "T"));
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assert_eq!(&item.krate().name, krate);
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}
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fn extract_elem_ty(ty: Ty) -> Ty {
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match ty.kind() {
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TyKind::RigidTy(RigidTy::Adt(_, args)) => {
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*args.0[0].expect_ty()
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}
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_ => unreachable!("Expected Vec ADT, but found: {ty:?}")
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}
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}
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/// Check signature and type of `Vec::<u8>::new` and its generic version.
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fn test_vec_new(instance: mir::mono::Instance) {
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let sig = instance.fn_abi().unwrap();
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assert_eq!(&sig.args, &[]);
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let elem_ty = extract_elem_ty(sig.ret.ty);
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assert_matches!(elem_ty.kind(), TyKind::RigidTy(RigidTy::Uint(UintTy::U8)));
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// Get the signature for Vec::<T>::new.
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let item = CrateItem::try_from(instance).unwrap();
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let ty = item.ty();
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let gen_sig = ty.kind().fn_sig().unwrap().skip_binder();
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let gen_ty = extract_elem_ty(gen_sig.output());
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assert_matches!(gen_ty.kind(), TyKind::Param(_));
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}
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/// Inspect the instance body
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fn get_instances(body: mir::Body) -> Vec<Instance> {
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body.blocks.iter().filter_map(|bb| {
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match &bb.terminator.kind {
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Call { func, .. } => {
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let TyKind::RigidTy(ty) = func.ty(body.locals()).unwrap().kind() else { unreachable!
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() };
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let RigidTy::FnDef(def, args) = ty else { unreachable!() };
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Instance::resolve(def, &args).ok()
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}
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_ => {
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None
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}
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}
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}).collect::<Vec<_>>()
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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 = "defs_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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"-Cpanic=abort".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_stable_mir).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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#![feature(core_intrinsics)]
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fn main() {{
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let _c = core::char::from_u32(99);
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let _v = Vec::<u8>::new();
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let _i = std::intrinsics::ctpop::<u8>(0);
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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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