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
|
// RUN: %clang_cc1 -verify -Wno-string-plus-int -Warray-bounds-pointer-arithmetic %s
void swallow (const char *x) { (void)x; }
void test_pointer_arithmetic(int n) {
const char hello[] = "Hello world!"; // expected-note 2 {{declared here}}
const char *helloptr = hello;
swallow("Hello world!" + 6); // no-warning
swallow("Hello world!" - 6); // expected-warning {{the pointer decremented by 6 refers before the beginning of the array}}
swallow("Hello world!" + 14); // expected-warning {{the pointer incremented by 14 refers past the end of the array (that has type 'const char[13]')}}
swallow("Hello world!" + 13); // no-warning
swallow(hello + 6); // no-warning
swallow(hello - 6); // expected-warning {{the pointer decremented by 6 refers before the beginning of the array}}
swallow(hello + 14); // expected-warning {{the pointer incremented by 14 refers past the end of the array (that has type 'const char[13]')}}
swallow(hello + 13); // no-warning
swallow(helloptr + 6); // no-warning
swallow(helloptr - 6); // no-warning
swallow(helloptr + 14); // no-warning
swallow(helloptr + 13); // no-warning
double numbers[2]; // expected-note {{declared here}}
swallow((char*)numbers + sizeof(double)); // no-warning
swallow((char*)numbers + 60); // expected-warning {{the pointer incremented by 60 refers past the end of the array (that has type 'double[2]')}}
char buffer[5]; // expected-note 2 {{declared here}}
// TODO: Add FixIt notes for adding parens around non-ptr part of arith expr
swallow(buffer + sizeof("Hello")-1); // expected-warning {{the pointer incremented by 6 refers past the end of the array (that has type 'char[5]')}}
swallow(buffer + (sizeof("Hello")-1)); // no-warning
if (n > 0 && n <= 6) swallow(buffer + 6 - n); // expected-warning {{the pointer incremented by 6 refers past the end of the array (that has type 'char[5]')}}
if (n > 0 && n <= 6) swallow(buffer + (6 - n)); // no-warning
}
|
