1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
//@ run-pass
//! Test information regarding type layout.
//@ ignore-stage1
//@ ignore-cross-compile
//@ ignore-remote
//@ ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
#![feature(rustc_private)]
#![feature(assert_matches)]
#![feature(control_flow_enum)]
#![feature(ascii_char, ascii_char_variants)]
extern crate rustc_hir;
#[macro_use]
extern crate rustc_smir;
extern crate rustc_driver;
extern crate rustc_interface;
extern crate stable_mir;
use rustc_smir::rustc_internal;
use stable_mir::abi::{
ArgAbi, CallConvention, FieldsShape, IntegerLength, PassMode, Primitive, Scalar, ValueAbi,
VariantsShape,
};
use stable_mir::mir::mono::Instance;
use stable_mir::target::MachineInfo;
use stable_mir::{CrateDef, CrateItem, CrateItems, ItemKind};
use std::assert_matches::assert_matches;
use std::convert::TryFrom;
use std::io::Write;
use std::ops::ControlFlow;
const CRATE_NAME: &str = "input";
/// This function uses the Stable MIR APIs to get information about the test crate.
fn test_stable_mir() -> ControlFlow<()> {
// Find items in the local crate.
let items = stable_mir::all_local_items();
// Test fn_abi
let target_fn = *get_item(&items, (ItemKind::Fn, "fn_abi")).unwrap();
let instance = Instance::try_from(target_fn).unwrap();
let fn_abi = instance.fn_abi().unwrap();
assert_eq!(fn_abi.conv, CallConvention::Rust);
assert_eq!(fn_abi.args.len(), 3);
check_ignore(&fn_abi.args[0]);
check_primitive(&fn_abi.args[1]);
check_niche(&fn_abi.args[2]);
check_result(&fn_abi.ret);
// Test variadic function.
let variadic_fn = *get_item(&items, (ItemKind::Fn, "variadic_fn")).unwrap();
check_variadic(variadic_fn);
ControlFlow::Continue(())
}
/// Check the variadic function ABI:
/// ```no_run
/// pub unsafe extern "C" fn variadic_fn(n: usize, mut args: ...) -> usize {
/// 0
/// }
/// ```
fn check_variadic(variadic_fn: CrateItem) {
let instance = Instance::try_from(variadic_fn).unwrap();
let abi = instance.fn_abi().unwrap();
assert!(abi.c_variadic);
assert_eq!(abi.args.len(), 1);
}
/// Check the argument to be ignored: `ignore: [u8; 0]`.
fn check_ignore(abi: &ArgAbi) {
assert!(abi.ty.kind().is_array());
assert_eq!(abi.mode, PassMode::Ignore);
let layout = abi.layout.shape();
assert!(layout.is_sized());
assert!(layout.is_1zst());
}
/// Check the primitive argument: `primitive: char`.
fn check_primitive(abi: &ArgAbi) {
assert!(abi.ty.kind().is_char());
assert_matches!(abi.mode, PassMode::Direct(_));
let layout = abi.layout.shape();
assert!(layout.is_sized());
assert!(!layout.is_1zst());
assert_matches!(layout.fields, FieldsShape::Primitive);
}
/// Check the return value: `Result<usize, &str>`.
fn check_result(abi: &ArgAbi) {
assert!(abi.ty.kind().is_enum());
assert_matches!(abi.mode, PassMode::Indirect { .. });
let layout = abi.layout.shape();
assert!(layout.is_sized());
assert_matches!(layout.fields, FieldsShape::Arbitrary { .. });
assert_matches!(layout.variants, VariantsShape::Multiple { .. })
}
/// Check the niche information about: `NonZeroU8`
fn check_niche(abi: &ArgAbi) {
assert!(abi.ty.kind().is_struct());
assert_matches!(abi.mode, PassMode::Direct { .. });
let layout = abi.layout.shape();
assert!(layout.is_sized());
assert_eq!(layout.size.bytes(), 1);
let ValueAbi::Scalar(scalar) = layout.abi else { unreachable!() };
assert!(scalar.has_niche(&MachineInfo::target()), "Opps: {:?}", scalar);
let Scalar::Initialized { value, valid_range } = scalar else { unreachable!() };
assert_matches!(value, Primitive::Int { length: IntegerLength::I8, signed: false });
assert_eq!(valid_range.start, 1);
assert_eq!(valid_range.end, u8::MAX.into());
assert!(!valid_range.contains(0));
assert!(!valid_range.wraps_around());
}
fn get_item<'a>(
items: &'a CrateItems,
item: (ItemKind, &str),
) -> Option<&'a stable_mir::CrateItem> {
items.iter().find(|crate_item| (item.0 == crate_item.kind()) && crate_item.name() == item.1)
}
/// This test will generate and analyze a dummy crate using the stable mir.
/// For that, it will first write the dummy crate into a file.
/// Then it will create a `StableMir` using custom arguments and then
/// it will run the compiler.
fn main() {
let path = "alloc_input.rs";
generate_input(&path).unwrap();
let args = vec![
"rustc".to_string(),
"--crate-type=lib".to_string(),
"--crate-name".to_string(),
CRATE_NAME.to_string(),
path.to_string(),
];
run!(args, test_stable_mir).unwrap();
}
fn generate_input(path: &str) -> std::io::Result<()> {
let mut file = std::fs::File::create(path)?;
write!(
file,
r#"
#![feature(c_variadic)]
#![allow(unused_variables)]
use std::num::NonZeroU8;
pub fn fn_abi(
ignore: [u8; 0],
primitive: char,
niche: NonZeroU8,
) -> Result<usize, &'static str> {{
// We only care about the signature.
todo!()
}}
pub unsafe extern "C" fn variadic_fn(n: usize, mut args: ...) -> usize {{
0
}}
"#
)?;
Ok(())
}
|
