rustc/tests/mir-opt/building/custom/debuginfo.rs

#![feature(custom_mir, core_intrinsics)]

extern crate core;
use core::intrinsics::mir::*;

// EMIT_MIR debuginfo.pointee.built.after.mir
#[custom_mir(dialect = "built")]
fn pointee(opt: &mut Option<i32>) {
    // CHECK-LABEL: fn pointee(
    // CHECK: debug foo => (((*_1) as variant#1).0: i32);
    mir! {
        debug foo => Field::<i32>(Variant(*opt, 1), 0);
        {
            Return()
        }
    }
}

// EMIT_MIR debuginfo.numbered.built.after.mir
#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
fn numbered(i: (u32, i32)) {
    // CHECK-LABEL: fn numbered(
    // CHECK: debug first => (_1.0: u32);
    // CHECK: debug second => (_1.1: i32);
    mir! {
        debug first => i.0;
        debug second => i.1;
        {
            Return()
        }
    }
}

struct S {
    x: f32,
}

// EMIT_MIR debuginfo.structured.built.after.mir
#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
fn structured(i: S) {
    // CHECK-LABEL: fn structured(
    // CHECK: debug x => (_1.0: f32);
    mir! {
        debug x => i.x;
        {
            Return()
        }
    }
}

// EMIT_MIR debuginfo.variant.built.after.mir
#[custom_mir(dialect = "built")]
fn variant(opt: Option<i32>) {
    // CHECK-LABEL: fn variant(
    // CHECK: debug inner => ((_1 as variant#1).0: i32);
    mir! {
        debug inner => Field::<i32>(Variant(opt, 1), 0);
        {
            Return()
        }
    }
}

// EMIT_MIR debuginfo.variant_deref.built.after.mir
#[custom_mir(dialect = "built")]
fn variant_deref(opt: Option<&i32>) {
    // CHECK-LABEL: fn variant_deref(
    // CHECK: debug pointer => ((_1 as variant#1).0: &i32);
    // CHECK: debug deref => (*((_1 as variant#1).0: &i32));
    mir! {
        debug pointer => Field::<&i32>(Variant(opt, 1), 0);
        debug deref => *Field::<&i32>(Variant(opt, 1), 0);
        {
            Return()
        }
    }
}

// EMIT_MIR debuginfo.constant.built.after.mir
#[custom_mir(dialect = "built")]
fn constant() {
    // CHECK-LABEL: fn constant(
    // CHECK: debug scalar => const 5_usize;
    mir!(
        debug scalar => 5_usize;
        {
            Return()
        }
    )
}

fn main() {
    numbered((5, 6));
    structured(S { x: 5. });
    variant(Some(5));
    variant_deref(Some(&5));
    pointee(&mut Some(5));
    constant();
}