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
|
use clippy_utils::diagnostics::span_lint;
use clippy_utils::{is_expn_of, match_panic_call};
use if_chain::if_chain;
use rustc_hir::Expr;
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::Span;
declare_clippy_lint! {
/// **What it does:** Checks for usage of `panic!`.
///
/// **Why is this bad?** `panic!` will stop the execution of the executable
///
/// **Known problems:** None.
///
/// **Example:**
/// ```no_run
/// panic!("even with a good reason");
/// ```
pub PANIC,
restriction,
"usage of the `panic!` macro"
}
declare_clippy_lint! {
/// **What it does:** Checks for usage of `unimplemented!`.
///
/// **Why is this bad?** This macro should not be present in production code
///
/// **Known problems:** None.
///
/// **Example:**
/// ```no_run
/// unimplemented!();
/// ```
pub UNIMPLEMENTED,
restriction,
"`unimplemented!` should not be present in production code"
}
declare_clippy_lint! {
/// **What it does:** Checks for usage of `todo!`.
///
/// **Why is this bad?** This macro should not be present in production code
///
/// **Known problems:** None.
///
/// **Example:**
/// ```no_run
/// todo!();
/// ```
pub TODO,
restriction,
"`todo!` should not be present in production code"
}
declare_clippy_lint! {
/// **What it does:** Checks for usage of `unreachable!`.
///
/// **Why is this bad?** This macro can cause code to panic
///
/// **Known problems:** None.
///
/// **Example:**
/// ```no_run
/// unreachable!();
/// ```
pub UNREACHABLE,
restriction,
"usage of the `unreachable!` macro"
}
declare_lint_pass!(PanicUnimplemented => [UNIMPLEMENTED, UNREACHABLE, TODO, PANIC]);
impl<'tcx> LateLintPass<'tcx> for PanicUnimplemented {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
if match_panic_call(cx, expr).is_some()
&& (is_expn_of(expr.span, "debug_assert").is_none() && is_expn_of(expr.span, "assert").is_none())
{
let span = get_outer_span(expr);
if is_expn_of(expr.span, "unimplemented").is_some() {
span_lint(
cx,
UNIMPLEMENTED,
span,
"`unimplemented` should not be present in production code",
);
} else if is_expn_of(expr.span, "todo").is_some() {
span_lint(cx, TODO, span, "`todo` should not be present in production code");
} else if is_expn_of(expr.span, "unreachable").is_some() {
span_lint(cx, UNREACHABLE, span, "usage of the `unreachable!` macro");
} else if is_expn_of(expr.span, "panic").is_some() {
span_lint(cx, PANIC, span, "`panic` should not be present in production code");
}
}
}
}
fn get_outer_span(expr: &Expr<'_>) -> Span {
if_chain! {
if expr.span.from_expansion();
let first = expr.span.ctxt().outer_expn_data().call_site;
if first.from_expansion();
then {
first.ctxt().outer_expn_data().call_site
} else {
expr.span
}
}
}
|
