rust/tests/mir-opt/unnamed-fields/field_access.rs

74 lines
2.0 KiB
Rust

// Tests the correct handling of unnamed fields within structs and unions marked with #[repr(C)].
// EMIT_MIR field_access.foo.SimplifyCfg-initial.after.mir
// EMIT_MIR field_access.bar.SimplifyCfg-initial.after.mir
#![allow(incomplete_features)]
#![feature(unnamed_fields)]
#[repr(C)]
struct Foo {
a: u8,
_: struct {
b: i8,
c: bool,
},
_: struct {
_: struct {
d: [u8; 1],
}
},
}
#[repr(C)]
union Bar {
a: u8,
_: union {
b: i8,
c: bool,
},
_: union {
_: union {
d: [u8; 1],
}
},
}
fn access<T>(_: T) {}
// CHECK-LABEL: fn foo(
fn foo(foo: Foo) {
// CHECK [[a:_.*]] = (_1.0: u8);
// CHECK _.* = access::<u8>(move [[a]]) -> [return: bb1, unwind: bb5];
access(foo.a);
// CHECK [[b:_.*]] = ((_1.1: Foo::{anon_adt#0}).0: i8);
// CHECK _.* = access::<i8>(move [[b]]) -> [return: bb2, unwind: bb5];
access(foo.b);
// CHECK [[c:_.*]] = ((_1.1: Foo::{anon_adt#0}).1: bool);
// CHECK _.* = access::<bool>(move [[c]]) -> [return: bb3, unwind: bb5];
access(foo.c);
// CHECK [[d:_.*]] = (((_1.2: Foo::{anon_adt#1}).0: Foo::{anon_adt#1}::{anon_adt#0}).0: [u8; 1]);
// CHECK _.* = access::<[u8; 1]>(move [[d]]) -> [return: bb4, unwind: bb5];
access(foo.d);
}
// CHECK-LABEL: fn bar(
fn bar(bar: Bar) {
unsafe {
// CHECK [[a:_.*]] = (_1.0: u8);
// CHECK _.* = access::<u8>(move [[a]]) -> [return: bb1, unwind: bb5];
access(bar.a);
// CHECK [[b:_.*]] = ((_1.1: Bar::{anon_adt#0}).0: i8);
// CHECK _.* = access::<i8>(move [[b]]) -> [return: bb2, unwind: bb5];
access(bar.b);
// CHECK [[c:_.*]] = ((_1.1: Bar::{anon_adt#0}).1: bool);
// CHECK _.* = access::<bool>(move [[c]]) -> [return: bb3, unwind: bb5];
access(bar.c);
// CHECK [[d:_.*]] = (((_1.2: Bar::{anon_adt#1}).0: Bar::{anon_adt#1}::{anon_adt#0}).0: [u8; 1]);
// CHECK _.* = access::<[u8; 1]>(move [[d]]) -> [return: bb4, unwind: bb5];
access(bar.d);
}
}
fn main() {}