f91ccf9ace
Simplify the `run` macro to avoid sometimes unnecessary dependency on `TyCtxt`. Instead, users can use the new internal method `tcx()`. Additionally, extend the macro to accept closures that may capture variables. These are non-backward compatible changes, but they only affect internal APIs which are provided today as helper functions until we have a stable API to start the compiler.
142 lines
4.2 KiB
Rust
142 lines
4.2 KiB
Rust
// run-pass
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//! Test information regarding type layout.
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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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#![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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#[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_smir::rustc_internal;
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use stable_mir::abi::{ArgAbi, CallConvention, FieldsShape, PassMode, VariantsShape};
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use stable_mir::mir::mono::Instance;
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use stable_mir::{CrateDef, CrateItem, CrateItems, ItemKind};
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use std::assert_matches::assert_matches;
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use std::convert::TryFrom;
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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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// Find items in the local crate.
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let items = stable_mir::all_local_items();
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// Test fn_abi
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let target_fn = *get_item(&items, (ItemKind::Fn, "fn_abi")).unwrap();
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let instance = Instance::try_from(target_fn).unwrap();
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let fn_abi = instance.fn_abi().unwrap();
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assert_eq!(fn_abi.conv, CallConvention::Rust);
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assert_eq!(fn_abi.args.len(), 2);
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check_ignore(&fn_abi.args[0]);
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check_primitive(&fn_abi.args[1]);
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check_result(fn_abi.ret);
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// Test variadic function.
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let variadic_fn = *get_item(&items, (ItemKind::Fn, "variadic_fn")).unwrap();
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check_variadic(variadic_fn);
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ControlFlow::Continue(())
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}
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/// Check the variadic function ABI:
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/// ```no_run
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/// pub unsafe extern "C" fn variadic_fn(n: usize, mut args: ...) -> usize {
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/// 0
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/// }
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/// ```
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fn check_variadic(variadic_fn: CrateItem) {
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let instance = Instance::try_from(variadic_fn).unwrap();
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let abi = instance.fn_abi().unwrap();
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assert!(abi.c_variadic);
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assert_eq!(abi.args.len(), 1);
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}
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/// Check the argument to be ignored: `ignore: [u8; 0]`.
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fn check_ignore(abi: &ArgAbi) {
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assert!(abi.ty.kind().is_array());
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assert_eq!(abi.mode, PassMode::Ignore);
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let layout = abi.layout.shape();
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assert!(layout.is_sized());
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assert!(layout.is_1zst());
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}
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/// Check the primitive argument: `primitive: char`.
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fn check_primitive(abi: &ArgAbi) {
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assert!(abi.ty.kind().is_char());
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assert_matches!(abi.mode, PassMode::Direct(_));
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let layout = abi.layout.shape();
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assert!(layout.is_sized());
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assert!(!layout.is_1zst());
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assert_matches!(layout.fields, FieldsShape::Primitive);
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}
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/// Check the return value: `Result<usize, &str>`.
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fn check_result(abi: ArgAbi) {
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assert!(abi.ty.kind().is_enum());
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assert_matches!(abi.mode, PassMode::Indirect { .. });
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let layout = abi.layout.shape();
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assert!(layout.is_sized());
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assert_matches!(layout.fields, FieldsShape::Arbitrary { .. });
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assert_matches!(layout.variants, VariantsShape::Multiple { .. })
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}
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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| (item.0 == crate_item.kind()) && crate_item.name() == item.1)
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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-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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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(c_variadic)]
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#![allow(unused_variables)]
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pub fn fn_abi(ignore: [u8; 0], primitive: char) -> Result<usize, &'static str> {{
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// We only care about the signature.
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todo!()
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}}
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pub unsafe extern "C" fn variadic_fn(n: usize, mut args: ...) -> usize {{
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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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