rust/tests/mir-opt/building/custom/projections.rs

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2022-12-04 02:20:37 -06:00
#![feature(custom_mir, core_intrinsics)]
extern crate core;
use core::intrinsics::mir::*;
union U {
a: i32,
b: u32,
}
// EMIT_MIR projections.unions.built.after.mir
#[custom_mir(dialect = "built")]
fn unions(u: U) -> i32 {
mir!({
RET = u.a;
Return()
})
}
// EMIT_MIR projections.tuples.built.after.mir
#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
fn tuples(i: (u32, i32)) -> (u32, i32) {
mir!(
// FIXME(JakobDegen): This is necessary because we can't give type hints for `RET`
let temp: (u32, i32);
{
temp.0 = i.0;
temp.1 = i.1;
RET = temp;
Return()
}
)
}
// EMIT_MIR projections.unwrap.built.after.mir
#[custom_mir(dialect = "built")]
fn unwrap(opt: Option<i32>) -> i32 {
mir!({
RET = Field(Variant(opt, 1), 0);
Return()
})
}
// EMIT_MIR projections.unwrap_deref.built.after.mir
#[custom_mir(dialect = "built")]
fn unwrap_deref(opt: Option<&i32>) -> i32 {
mir!({
RET = *Field::<&i32>(Variant(opt, 1), 0);
Return()
})
}
// EMIT_MIR projections.set.built.after.mir
#[custom_mir(dialect = "built")]
fn set(opt: &mut Option<i32>) {
mir!({
place!(Field(Variant(*opt, 1), 0)) = 10;
Return()
})
}
// EMIT_MIR projections.simple_index.built.after.mir
#[custom_mir(dialect = "built")]
fn simple_index(a: [i32; 10], b: &[i32]) -> i32 {
mir!({
let temp = 3;
RET = a[temp];
RET = (*b)[temp];
Return()
})
}
fn main() {
assert_eq!(unions(U { a: 5 }), 5);
assert_eq!(tuples((5, 6)), (5, 6));
assert_eq!(unwrap(Some(5)), 5);
assert_eq!(unwrap_deref(Some(&5)), 5);
let mut o = Some(5);
set(&mut o);
assert_eq!(o, Some(10));
assert_eq!(simple_index([0; 10], &[0; 10]), 0);
}