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|
use base_db::fixture::WithFixture;
use chalk_ir::{AdtId, TyKind};
use hir_def::{
db::DefDatabase,
layout::{Layout, LayoutError},
};
use crate::{test_db::TestDB, Interner, Substitution};
use super::layout_of_ty;
fn eval_goal(ra_fixture: &str, minicore: &str) -> Result<Layout, LayoutError> {
// using unstable cargo features failed, fall back to using plain rustc
let mut cmd = std::process::Command::new("rustc");
cmd.args(["-Z", "unstable-options", "--print", "target-spec-json"]).env("RUSTC_BOOTSTRAP", "1");
let output = cmd.output().unwrap();
assert!(output.status.success(), "{}", output.status);
let stdout = String::from_utf8(output.stdout).unwrap();
let target_data_layout =
stdout.split_once(r#""data-layout": ""#).unwrap().1.split_once('"').unwrap().0.to_owned();
let ra_fixture = format!(
"{minicore}//- /main.rs crate:test target_data_layout:{target_data_layout}\n{ra_fixture}",
);
let (db, file_id) = TestDB::with_single_file(&ra_fixture);
let module_id = db.module_for_file(file_id);
let def_map = module_id.def_map(&db);
let scope = &def_map[module_id.local_id].scope;
let adt_id = scope
.declarations()
.find_map(|x| match x {
hir_def::ModuleDefId::AdtId(x) => {
let name = match x {
hir_def::AdtId::StructId(x) => db.struct_data(x).name.to_smol_str(),
hir_def::AdtId::UnionId(x) => db.union_data(x).name.to_smol_str(),
hir_def::AdtId::EnumId(x) => db.enum_data(x).name.to_smol_str(),
};
(name == "Goal").then_some(x)
}
_ => None,
})
.unwrap();
let goal_ty = TyKind::Adt(AdtId(adt_id), Substitution::empty(Interner)).intern(Interner);
layout_of_ty(&db, &goal_ty, module_id.krate())
}
#[track_caller]
fn check_size_and_align(ra_fixture: &str, minicore: &str, size: u64, align: u64) {
let l = eval_goal(ra_fixture, minicore).unwrap();
assert_eq!(l.size.bytes(), size);
assert_eq!(l.align.abi.bytes(), align);
}
#[track_caller]
fn check_fail(ra_fixture: &str, e: LayoutError) {
let r = eval_goal(ra_fixture, "");
assert_eq!(r, Err(e));
}
macro_rules! size_and_align {
(minicore: $($x:tt),*;$($t:tt)*) => {
{
#[allow(dead_code)]
$($t)*
check_size_and_align(
stringify!($($t)*),
&format!("//- minicore: {}\n", stringify!($($x),*)),
::std::mem::size_of::<Goal>() as u64,
::std::mem::align_of::<Goal>() as u64,
);
}
};
($($t:tt)*) => {
{
#[allow(dead_code)]
$($t)*
check_size_and_align(
stringify!($($t)*),
"",
::std::mem::size_of::<Goal>() as u64,
::std::mem::align_of::<Goal>() as u64,
);
}
};
}
#[test]
fn hello_world() {
size_and_align! {
struct Goal(i32);
}
}
#[test]
fn field_order_optimization() {
size_and_align! {
struct Goal(u8, i32, u8);
}
size_and_align! {
#[repr(C)]
struct Goal(u8, i32, u8);
}
}
#[test]
fn recursive() {
size_and_align! {
struct Goal {
left: &'static Goal,
right: &'static Goal,
}
}
size_and_align! {
struct BoxLike<T: ?Sized>(*mut T);
struct Goal(BoxLike<Goal>);
}
check_fail(
r#"struct Goal(Goal);"#,
LayoutError::UserError("infinite sized recursive type".to_string()),
);
check_fail(
r#"
struct Foo<T>(Foo<T>);
struct Goal(Foo<i32>);
"#,
LayoutError::UserError("infinite sized recursive type".to_string()),
);
}
#[test]
fn generic() {
size_and_align! {
struct Pair<A, B>(A, B);
struct Goal(Pair<Pair<i32, u8>, i64>);
}
size_and_align! {
struct X<const N: usize> {
field1: [i32; N],
field2: [u8; N],
}
struct Goal(X<1000>);
}
}
#[test]
fn enums() {
size_and_align! {
enum Goal {
Quit,
Move { x: i32, y: i32 },
ChangeColor(i32, i32, i32),
}
}
}
#[test]
fn primitives() {
size_and_align! {
struct Goal(i32, i128, isize, usize, f32, f64, bool, char);
}
}
#[test]
fn tuple() {
size_and_align! {
struct Goal((), (i32, u64, bool));
}
}
#[test]
fn non_zero() {
size_and_align! {
minicore: non_zero, option;
use core::num::NonZeroU8;
struct Goal(Option<NonZeroU8>);
}
}
#[test]
fn niche_optimization() {
size_and_align! {
minicore: option;
struct Goal(Option<&'static i32>);
}
size_and_align! {
minicore: option;
struct Goal(Option<Option<bool>>);
}
}
#[test]
fn enums_with_discriminants() {
size_and_align! {
enum Goal {
A = 1000,
B = 2000,
C = 3000,
}
}
size_and_align! {
enum Goal {
A = 254,
B,
C, // implicitly becomes 256, so we need two bytes
}
}
}
|
