147 lines
4.8 KiB
Rust
147 lines
4.8 KiB
Rust
//@ run-pass
|
|
//! Test a few methods to transform StableMIR.
|
|
|
|
//@ ignore-stage1
|
|
//@ ignore-cross-compile
|
|
//@ ignore-remote
|
|
//@ ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
|
|
|
|
#![feature(rustc_private)]
|
|
#![feature(assert_matches)]
|
|
#![feature(ascii_char, ascii_char_variants)]
|
|
|
|
extern crate rustc_hir;
|
|
#[macro_use]
|
|
extern crate rustc_smir;
|
|
extern crate rustc_driver;
|
|
extern crate rustc_interface;
|
|
extern crate stable_mir;
|
|
|
|
use rustc_smir::rustc_internal;
|
|
use stable_mir::mir::alloc::GlobalAlloc;
|
|
use stable_mir::mir::mono::Instance;
|
|
use stable_mir::mir::{Body, ConstOperand, Operand, Rvalue, StatementKind, TerminatorKind};
|
|
use stable_mir::ty::{ConstantKind, MirConst};
|
|
use stable_mir::{CrateDef, CrateItems, ItemKind};
|
|
use std::convert::TryFrom;
|
|
use std::io::Write;
|
|
use std::ops::ControlFlow;
|
|
|
|
const CRATE_NAME: &str = "input";
|
|
|
|
/// This function uses the Stable MIR APIs to transform the MIR.
|
|
fn test_transform() -> ControlFlow<()> {
|
|
// Find items in the local crate.
|
|
let items = stable_mir::all_local_items();
|
|
|
|
// Test fn_abi
|
|
let target_fn = *get_item(&items, (ItemKind::Fn, "dummy")).unwrap();
|
|
let instance = Instance::try_from(target_fn).unwrap();
|
|
let body = instance.body().unwrap();
|
|
check_msg(&body, "oops");
|
|
|
|
let new_msg = "new panic message";
|
|
let new_body = change_panic_msg(body, new_msg);
|
|
check_msg(&new_body, new_msg);
|
|
|
|
ControlFlow::Continue(())
|
|
}
|
|
|
|
/// Check that the body panic message matches the given message.
|
|
fn check_msg(body: &Body, expected: &str) {
|
|
let msg = body
|
|
.blocks
|
|
.iter()
|
|
.find_map(|bb| match &bb.terminator.kind {
|
|
TerminatorKind::Call { args, .. } => {
|
|
assert_eq!(args.len(), 1, "Expected panic message, but found {args:?}");
|
|
let msg_const = match &args[0] {
|
|
Operand::Constant(msg_const) => msg_const,
|
|
Operand::Copy(place) | Operand::Move(place) => {
|
|
assert!(place.projection.is_empty());
|
|
bb.statements
|
|
.iter()
|
|
.find_map(|stmt| match &stmt.kind {
|
|
StatementKind::Assign(
|
|
destination,
|
|
Rvalue::Use(Operand::Constant(msg_const)),
|
|
) if destination == place => Some(msg_const),
|
|
_ => None,
|
|
})
|
|
.unwrap()
|
|
}
|
|
};
|
|
let ConstantKind::Allocated(alloc) = msg_const.const_.kind() else {
|
|
unreachable!()
|
|
};
|
|
assert_eq!(alloc.provenance.ptrs.len(), 1);
|
|
|
|
let alloc_prov_id = alloc.provenance.ptrs[0].1.0;
|
|
let GlobalAlloc::Memory(val) = GlobalAlloc::from(alloc_prov_id) else {
|
|
unreachable!()
|
|
};
|
|
let bytes = val.raw_bytes().unwrap();
|
|
Some(std::str::from_utf8(&bytes).unwrap().to_string())
|
|
}
|
|
_ => None,
|
|
})
|
|
.expect("Failed to find panic message");
|
|
assert_eq!(&msg, expected);
|
|
}
|
|
|
|
/// Modify body to use a different panic message.
|
|
fn change_panic_msg(mut body: Body, new_msg: &str) -> Body {
|
|
for bb in &mut body.blocks {
|
|
match &mut bb.terminator.kind {
|
|
TerminatorKind::Call { args, .. } => {
|
|
let new_const = MirConst::from_str(new_msg);
|
|
args[0] = Operand::Constant(ConstOperand {
|
|
const_: new_const,
|
|
span: bb.terminator.span,
|
|
user_ty: None,
|
|
});
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
body
|
|
}
|
|
|
|
fn get_item<'a>(
|
|
items: &'a CrateItems,
|
|
item: (ItemKind, &str),
|
|
) -> Option<&'a stable_mir::CrateItem> {
|
|
items.iter().find(|crate_item| (item.0 == crate_item.kind()) && crate_item.name() == item.1)
|
|
}
|
|
|
|
/// This test will generate and analyze a dummy crate using the stable mir.
|
|
/// For that, it will first write the dummy crate into a file.
|
|
/// Then it will create a `StableMir` using custom arguments and then
|
|
/// it will run the compiler.
|
|
fn main() {
|
|
let path = "transform_input.rs";
|
|
generate_input(&path).unwrap();
|
|
let args = vec![
|
|
"rustc".to_string(),
|
|
"--crate-type=lib".to_string(),
|
|
"--crate-name".to_string(),
|
|
CRATE_NAME.to_string(),
|
|
path.to_string(),
|
|
];
|
|
run!(args, test_transform).unwrap();
|
|
}
|
|
|
|
fn generate_input(path: &str) -> std::io::Result<()> {
|
|
let mut file = std::fs::File::create(path)?;
|
|
write!(
|
|
file,
|
|
r#"
|
|
fn panic_str(msg: &str) {{ panic!("{{}}", msg); }}
|
|
pub fn dummy() {{
|
|
panic_str("oops");
|
|
}}
|
|
"#
|
|
)?;
|
|
Ok(())
|
|
}
|