119 lines
3.6 KiB
Rust
119 lines
3.6 KiB
Rust
// run-pass
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//! Test that users are able to use stable mir APIs to retrieve information of global allocations
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//! such as `vtable_allocation`.
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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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#![feature(ascii_char, ascii_char_variants)]
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extern crate rustc_hir;
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extern crate rustc_middle;
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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 rustc_middle::ty::TyCtxt;
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use rustc_smir::rustc_internal;
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use stable_mir::{CrateItem, CrateItems, ItemKind};
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use stable_mir::mir::alloc::GlobalAlloc;
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use stable_mir::mir::mono::StaticDef;
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use std::ascii::Char;
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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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// Find items in the local crate.
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let items = stable_mir::all_local_items();
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check_foo(*get_item(&items, (ItemKind::Static, "FOO")).unwrap());
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check_bar(*get_item(&items, (ItemKind::Static, "BAR")).unwrap());
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ControlFlow::Continue(())
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}
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/// Check the allocation data for static `FOO`.
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///
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/// ```no_run
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/// static FOO: [&str; 2] = ["hi", "there"];
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/// ```
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fn check_foo(item: CrateItem) {
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let def = StaticDef::try_from(item).unwrap();
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let alloc = def.eval_initializer().unwrap();
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assert_eq!(alloc.provenance.ptrs.len(), 2);
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let alloc_id_0 = alloc.provenance.ptrs[0].1.0;
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assert_matches!(GlobalAlloc::from(alloc_id_0), GlobalAlloc::Memory(..));
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let alloc_id_1 = alloc.provenance.ptrs[1].1.0;
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assert_matches!(GlobalAlloc::from(alloc_id_1), GlobalAlloc::Memory(..));
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}
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/// Check the allocation data for static `BAR`.
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///
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/// ```no_run
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/// static BAR: &str = "Bar";
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/// ```
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fn check_bar(item: CrateItem) {
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let def = StaticDef::try_from(item).unwrap();
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let alloc = def.eval_initializer().unwrap();
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assert_eq!(alloc.provenance.ptrs.len(), 1);
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let alloc_id_0 = alloc.provenance.ptrs[0].1.0;
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let GlobalAlloc::Memory(allocation) = GlobalAlloc::from(alloc_id_0) else { unreachable!() };
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assert_eq!(allocation.bytes.len(), 3);
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assert_eq!(allocation.bytes[0].unwrap(), Char::CapitalB.to_u8());
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assert_eq!(allocation.bytes[1].unwrap(), Char::SmallA.to_u8());
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assert_eq!(allocation.bytes[2].unwrap(), Char::SmallR.to_u8());
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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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items: &'a CrateItems,
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item: (ItemKind, &str),
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) -> Option<&'a stable_mir::CrateItem> {
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items.iter().find(|crate_item| {
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(item.0 == crate_item.kind()) && crate_item.name() == 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 = "alloc_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-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, tcx, test_stable_mir(tcx)).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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static FOO: [&str; 2] = ["hi", "there"];
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static BAR: &str = "Bar";
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pub fn main() {{
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println!("{{FOO:?}}! {{BAR}}");
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}}"#
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)?;
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Ok(())
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}
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