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
|
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use rustc_errors::Applicability;
use rustc_hir::{Item, ItemKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_target::spec::abi::Abi;
declare_clippy_lint! {
/// ### What it does
/// Checks for Rust ABI functions with the `#[no_mangle]` attribute.
///
/// ### Why is this bad?
/// The Rust ABI is not stable, but in many simple cases matches
/// enough with the C ABI that it is possible to forget to add
/// `extern "C"` to a function called from C. Changes to the
/// Rust ABI can break this at any point.
///
/// ### Example
/// ```rust
/// #[no_mangle]
/// fn example(arg_one: u32, arg_two: usize) {}
/// ```
///
/// Use instead:
/// ```rust
/// #[no_mangle]
/// extern "C" fn example(arg_one: u32, arg_two: usize) {}
/// ```
#[clippy::version = "1.69.0"]
pub NO_MANGLE_WITH_RUST_ABI,
pedantic,
"convert Rust ABI functions to C ABI"
}
declare_lint_pass!(NoMangleWithRustAbi => [NO_MANGLE_WITH_RUST_ABI]);
impl<'tcx> LateLintPass<'tcx> for NoMangleWithRustAbi {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
if let ItemKind::Fn(fn_sig, _, _) = &item.kind {
let attrs = cx.tcx.hir().attrs(item.hir_id());
let mut applicability = Applicability::MachineApplicable;
let snippet = snippet_with_applicability(cx, fn_sig.span, "..", &mut applicability);
for attr in attrs {
if let Some(ident) = attr.ident()
&& ident.name == rustc_span::sym::no_mangle
&& fn_sig.header.abi == Abi::Rust
&& !snippet.contains("extern") {
let suggestion = snippet.split_once("fn")
.map_or(String::new(), |(first, second)| format!(r#"{first}extern "C" fn{second}"#));
span_lint_and_sugg(
cx,
NO_MANGLE_WITH_RUST_ABI,
fn_sig.span,
"attribute #[no_mangle] set on a Rust ABI function",
"try",
suggestion,
applicability
);
}
}
}
}
}
|
