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Add method to retrieve body of closure in stable-mir #141307

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Add method to retrieve body of closure in stable-mir #141307

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6 changes: 6 additions & 0 deletions compiler/rustc_smir/src/stable_mir/ty.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -742,6 +742,12 @@ crate_def! {
pub ClosureDef;
}

impl ClosureDef {
pub fn body(&self) -> Option<Body> {
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Can you please add documentation?

with(|ctx| ctx.has_body(self.0).then(|| ctx.mir_body(self.0)))
}
}

crate_def! {
#[derive(Serialize)]
pub CoroutineDef;
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90 changes: 90 additions & 0 deletions tests/ui-fulldeps/stable-mir/closure_body.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,90 @@
//@ run-pass
//! Tests stable mir API for retrieving the body of a closure.

//@ ignore-stage1
//@ ignore-cross-compile
//@ ignore-remote
//@ edition: 2021

#![feature(rustc_private)]
#![feature(assert_matches)]

extern crate rustc_middle;
#[macro_use]
extern crate rustc_smir;
extern crate rustc_driver;
extern crate rustc_interface;
extern crate stable_mir;

use std::io::Write;
use std::ops::ControlFlow;

use stable_mir::mir::{Body, ConstOperand, Operand, TerminatorKind};
use stable_mir::ty::{FnDef, RigidTy, TyKind};

const CRATE_NAME: &str = "crate_closure_body";

fn test_closure_body() -> ControlFlow<()> {
let crate_items = stable_mir::all_local_items();
for item in crate_items {
let item_ty = item.ty();
match &item_ty.kind() {
TyKind::RigidTy(RigidTy::Closure(closure_def, _)) => {
let closure_body = closure_def.body().unwrap();
check_incr_closure_body(closure_body);
}
_ => {}
}
}

ControlFlow::Continue(())
}

fn check_incr_closure_body(body: Body) {
let first_block = &body.blocks[0];
let TerminatorKind::Call { func: Operand::Constant(ConstOperand { const_, .. }), .. } =
&first_block.terminator.kind
else {
panic!("expected Call Terminator, got: ");
};

let TyKind::RigidTy(RigidTy::FnDef(FnDef(def_id), ..), ..) = const_.ty().kind() else {
panic!("expected FnDef");
};

assert_eq!(def_id.name(), "incr");
}

fn main() {
let path = "closure_body.rs";
generate_input(&path).unwrap();
let args = &[
"rustc".to_string(),
"-Cpanic=abort".to_string(),
"--crate-name".to_string(),
CRATE_NAME.to_string(),
path.to_string(),
];
run!(args, test_closure_body).unwrap();
}

fn generate_input(path: &str) -> std::io::Result<()> {
let mut file = std::fs::File::create(path)?;
write!(
file,
r#"
fn incr(y: i32) -> i32 {{
y + 1
}}

fn main() {{
let cl_incr = |x: i32| {{
incr(x)
}};

let _= cl_incr(5);
}}
"#
)?;
Ok(())
}
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