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
|
// RUN: %clang_cc1 -fsyntax-only -std=c2x -verify %s
// This is the latest version of fallthrough that we support.
_Static_assert(__has_c_attribute(fallthrough) == 201910L);
void f(int n) {
switch (n) {
case 0:
n += 1;
[[fallthrough]]; // ok
case 1:
if (n) {
[[fallthrough]]; // ok
} else {
return;
}
case 2:
for (int n = 0; n != 10; ++n)
[[fallthrough]]; // expected-error {{does not directly precede switch label}}
case 3:
while (1)
[[fallthrough]]; // expected-error {{does not directly precede switch label}}
case 4:
while (0)
[[fallthrough]]; // expected-error {{does not directly precede switch label}}
case 5:
do [[fallthrough]]; while (1); // expected-error {{does not directly precede switch label}}
case 6:
do [[fallthrough]]; while (0); // expected-error {{does not directly precede switch label}}
case 7:
switch (n) {
case 0:
// FIXME: This should be an error, even though the next thing we do is to
// fall through in an outer switch statement.
[[fallthrough]];
}
case 8:
[[fallthrough]]; // expected-error {{does not directly precede switch label}}
goto label;
label:
case 9:
n += 1;
case 10: // no warning, -Wimplicit-fallthrough is not enabled in this test, and does not need to
// be enabled for these diagnostics to be produced.
break;
}
}
[[fallthrough]] typedef int n1; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
typedef int [[fallthrough]] n2; // expected-error {{'fallthrough' attribute cannot be applied to types}}
typedef int n3 [[fallthrough]]; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
enum [[fallthrough]] E { // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
One
};
struct [[fallthrough]] S { // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
int i;
};
[[fallthrough]] // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
void g(void) {
[[fallthrough]] int n; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}}
[[fallthrough]] ++n; // expected-error {{'fallthrough' attribute only applies to empty statements}}
switch (n) {
// FIXME: This should be an error.
[[fallthrough]];
return;
case 0:
[[fallthrough, fallthrough]]; // ok
case 1:
[[fallthrough(0)]]; // expected-error {{argument list}}
case 2:
break;
}
}
|
